Browse Topic: Reformulated diesel fuels

Items (52)

Diesel Fuel Lubricity Comparisons with HFRR and Scuffing Load Ball-on-Cylinder Lubricity Evaluator Methods

2014-01-276110/13/2014

Diesel fuel requires sufficient lubricity to prevent excessive wear in fuel injection equipment. The processes for removing sulfur from diesel fuel also eliminate compounds that are responsible for its lubricating properties. This phenomenon is counterbalanced by employing lubricity additives to restore fuel lubricity to an acceptable level. The aim of this study was to compare the two different laboratory methods for testing lubricity. The two methods were the EN 590 standard method high frequency reciprocating rig (HFRR) and a less utilized method scuffing load ball-on-cylinder lubricity evaluator (SLBOCLE). Two different commercial lubricity additives were used. In addition, rapeseed methyl ester (RME) was used for lubricity purposes in the same way as the additives. To study the possible effect of the base fuel, the tests were performed with fossil diesel fuel, paraffinic diesel (Hydrotreated vegetable oil, HVO), and a blend of these. The best HFRR - SLBOCLE correlation was found

Lehto, Kalle, Vepsäläinen, Aki, Kiiski, Ulla, Kuronen, Markku

Key Fuel Properties of Biodiesel-diesel Fuel-ethanol Blends

2009-01-181006/15/2009

The diesel biodiesel-diesel oil-bioethanol mixture displays real potential uses as an alternative fuel. The idea stands on the fact that a series of properties of the two biofuels complete each other. Therefore, in this study, biodiesel and bioetanol were blended with commercial diesel fuel at 5%, 10%, 15%, 20% and 25% and 30% on a volume basis to characterize the key fuel properties of the blends such as density, viscosity, surface tension, lubricity, flash point and cold filter plugging point. The densities of the diesel oil-biodiesel-bioethanol blends are in the range of 841-852 kg/m3, very close to the diesel fuel requirement related in EN 590. In the case of the investigated blends kinematic viscosity is in the range of 2.176…2.756 mm2/s. The blends flash points that containing 5% ethanol are in the range of 16…18 °C, and which containing 10% ethanol are less than 16 °C. Measured values of surface tensions are in the range of 28.47…34.83 mN/m. Keywords: biofuels, bioethanol

Barabás, István, Todoruţ, Adrian I.

Experimental Investigations on Performance and Emission Characteristics of Diesel Fuel Blended with 2-Ethoxy Ethyl Acetate and 2-Butoxy Ethanol

2008-01-168106/23/2008

The demand for compression ignition engines is continuously growing due to their good fuel efficiency. But they cause lot of concern with regard to exhaust emissions. This concern sought to examine ways by which the composition of the fuel used by CI engines could be changed to reduce emissions. The addition of oxygen containing compounds to diesel fuel has been proposed as a method to complete the oxidation of carbonaceous particulate matter and associated hydrocarbons. In addition many oxygenate have high cetane number and their association with diesel results in high cetane number and hence lower exhaust emissions. Due to this advantages, there is growing interest in the introduction of oxygenates into diesel fuel. The performance and emission characteristics of two kinds of oxygenates 2-Ethoxy Ethyl Acetate, 2-Butoxy Ethanol with three different blends were investigated. A considerable reduction of Smoke emission, Carbon monoxide and Unburned Hydrocarbon is obtained and Nitrogen

Srinivasan, P., Devaradjane, G.

NExBTL - Biodiesel Fuel of the Second Generation

2005-01-377110/24/2005

Biodiesel can be processed by esterification or by biomass-to-liquid (BTL) process. Neste Oil has developed a BTL diesel component NExBTL utilizing a proprietary conversion process for vegetable oils and animal fats. NExBTL biodiesel properties are similar to the best existing diesels such as GTL or Swedish Environmental Class 1 fuels. NExBTL is sulfur-, oxygen-, nitrogen- and aromatic free and has very high cetane number. Product meets the requirements set by EN590 and WWFC category 4 except for density. Cold properties (cloud point) of NExBTL can be adjusted in the production from -5 … -30°C to meet the needs of various climatic conditions. Heating value is similar to the EN590 hydrocarbon fuel, storage stability is good and water solubility low. NExBTL biodiesel is compatible with the existing vehicle fleet as well as diesel fuel logistic system and is technically easy to blend in conventional diesels in all ratios. NExBTL in diesel blends decrease both regulated and unregulated

Rantanen, Leena, Linnaila, Raimo, Aakko, Päivi, Harju, Tiina

Glycerol derivatives for diesel fuel reformulation

2005-01-220305/11/2005

Biofuels are an important means of progress to reduce greenhouse gases and local pollution and to diversify energy. For diesel engines, FAME (Fatty Acid Methyl Ester), coming from trans esterification of vegetable oils, have already shown their potential as fuel substitutes. Nevertheless, this trans esterification induces glycerol production as a co - product. At the same time, oxygenated compounds have been shown to have great potential for reducing diesel particulate emissions. So using glycerol as a basis to synthesize new oxygenated compounds, for diesel fuel formulation could be promising. This paper deals with the synthesis of oxygenated compounds coming from glycerol, such as acetals, ethers, or carbonates, and their evaluation as blending components in diesel fuel. The objective of this work is to evaluate their potential, in terms of pollutant emissions, with different engine technologies. Their impact on particulate emissions depends on the engine technology and the chemical

Jaecker-Voirol, A., Delfort, B., Montagne, X., Durand, I., Hillion, G.

Experimental Investigation to Specify the Effect of Oxygenated Additive Content and Type on DI Diesel Engine Performance and Emissions

2004-01-009703/08/2004

The reduction of brake specific consumption and pollutant emissions are issued as future challenges to diesel engine designers due to the depletion of fossil fuel reserves and to the continuous suppression of emission regulations. These mandates have prompted the automotive industry to couple the development of combustion systems in modern diesel engines with an adequate reformulation of diesel fuels and have stirred interest in the development of “clean” diesel fuels. The use of oxygenated fuels seems to be a promising solution towards reducing particulate emissions in existing and future diesel motor vehicles. The prospective of minimizing particulate emissions with small fuel consumption penalties seems to be quite attractive in the case of biodiesel fuels, which are considered as an alternative power source. Studies conducted in diffusion flames and compression ignition engines have shown a reduction of soot with increasing oxygen percentage. However, the effects of the type of

Zannis, T.C., Hountalas, D.T., Kouremenos, D.A.

The Development of a Lubricity Enhancing Controlled Release Diesel Fuel Filter

2003-01-314110/27/2003

Low lubricity diesel fuels have long been problematic when used in fuel systems due to increased wear tendencies of these types of fuels1. It has been demonstrated that a variety of additives can dramatically increase lubricity for diesel fuels, even at low treatment rates. However these additives must be added consistently for fuel systems to see the benefits associated with enhanced lubricity fuels. That is not always possible in field applications when drivers and/or maintenance personnel are relied upon to dose systems with bottled additives. This paper will detail the development and testing of a solution to the problem of unreliable additive addition in the field, a fuel filter that consistently releases a lubricity enhancing additive into fuel systems. The filter will be shown to have consistent release and effective performance through a variety of laboratory and field evaluations that will be detailed in this paper.

Martin, Harold R., Drozd, Joseph C.

Oxygenated Compounds and Diesel Engine Pollutant Emissions Performances of New Generation of Products

2002-01-285210/21/2002

To reduce pollutant emissions coming from transportation, different solutions are available: technology improvement and fuel reformulation. Concerning the diesel fuels, the reformulation can be done through an evolution of the classical families of compounds as, for example, level of polyaromatic content or through a very promising way to reduce particulate emissions which is the introduction of oxygenated compounds. Many works have already been done and have confirmed the interest of these compounds. This paper is dedicated to a new approach of synthesis or selection of oxygenated compounds.

Delfort, B., Durand, I., Jaecker-Voirol, A., Lacôme, T., Paillé, F., Montagne, X.

Evaluating a Fischer-Tropsch Fuel, Eco-Par™, in a Valmet Diesel Engine

2002-01-272610/21/2002

Reports have stated that Fischer Tropsch (FT) fuels are high quality, low emission diesel fuel substitutes. The purpose of this study is compare the emissions from a heavy-duty, Valmet, diesel engine running on a commercial available FT fuel, Eco-Partm, with the emissions obtained when the same engine is running on a low sulfur diesel fuel with low aromatic content, Swedish environmental class 1 (EC-1) diesel fuel. The two fuels have been analyzed by Fourier transform infrared spectroscopy and Raman Fourier transform infrared spectroscopy. The analyses showed that main constituents in the two fuels are alkanes with no substituents. No aromates or olefines could be detected. A small difference, later verified by gas chromatographic analyses, was noted; the Swedish EC-1 fuel consisted of a larger portion of straight chain, heavier hydrocarbons while the FT fuel consisted of more branched hydrocarbons. The overall impression of the emission analyses is that Eco-Partm gives lower emission

Nord, Kent, Haupt, Dan

Emission and Fuel Consumption Measurements for Transit Buses Running on Gaseous Fuels Using a Mobile Measurement System

2001-01-363809/24/2001

The emissions of heavy-duty engines have traditionally been measured in Europe by using steady-state engine dynamometer tests. However, several studies have proved that emissions of real stop-and-go driving are much higher than the steady-state results indicate. In this study, a mobile measurement system, located inside a vehicle, was utilized. The emissions and energy consumption of different gaseous fuel powered transit buses were measured by using two duty cycles, and the results were compared with diesel technology. The results indicated that NOX emissions of gaseous fuels were in the range of 30-90 % lower than diesel, depending on vehicle technology and fuel. However, energy consumption of gaseous fuels was found to be around 20-45 % higher than in the case of diesel.

Ikonen, Markku, Westerholm, Mårten, Nylund, Nils-Olof

Emission Characteristics of a Navistar 7.3L Turbodiesel Fueled with Blends of Dimethyl Ether and Diesel Fuel

2001-01-362609/24/2001

Several oxygenates have been proposed and tested for use with diesel fuel as a means of reducing exhaust emissions. This paper examines dimethyl ether (DME), which can be produced in many ways including via Air Products and Chemicals, Inc's Liquid Phase Technology (LPDME ™). Modest additions of DME into diesel fuel (2 wt.% oxygen) showed reductions in particulate matter emissions, but the previous data reported by the author from a multicylinder Navistar 7.3L Turbodiesel engine were scattered. In this study, experiments were performed on a multi-cylinder Navistar 7.3L Turbodiesel engine to repeatably confirm and extend the observations from the earlier studies. This is an important step in not only showing that the fuel does perform well in an engine with minor modifications to the fuel system, but also showing that DME can give consistent, significant results in lowering emissions. The DME and diesel blends tested were to achieve a net addition of 5 and 10 wt. % oxygen in the blended

Chapman, Elana M., Boehman, André L., Tijm, Peter, Waller, Francis

A New Method for Diesel HC Collection and Speciation

2000-01-295110/16/2000

As interest in diesel emissions has grown, so has the importance of analyzing the components of the exhaust. These compounds include alkanes, aromatics and alkenes, ranging in carbon number from C1 - C24, and polycyclic aromatic hydrocarbons (PAHs). These hydrocarbons can be in gaseous, semi-volatile and particulate form and cannot be collected accurately by conventional Tedlar™ bag sampling due to deposition of condensing vapor on bag walls. There are some sorbent methods used currently for the speciation of this exhaust, which require either thermal desorption and/or solvent extraction equipment. Automotive Testing Laboratories, Inc. (ATL) reports here on the use of a gas chromatography (GC) method designed to specifically look at hydrocarbons in the diesel (C9 - C24) range. Also described is the use of an impinger trapping method for collecting the hydrocarbons in diesel exhaust, a type of sampling which is most commonly used in the automotive emission community for the collection

Lanning, Lisa A., Smith, Kurt W., Tennant, Christopher J.

Emission Characteristics of a Navistar 7.3L Turbodiesel Fueled with Blends of Oxygenates and Diesel

2000-01-288710/16/2000

Several oxygenates have been proposed and tested for use with or as diesel fuel. This paper examines two such oxygenates, CETANER™ and dimethyl ether (DME), partially or wholly produced by Air Products and Chemicals, Inc's Liquid Phase Technology. In previous studies on a single cylinder compression ignition engine and a Volkswagen TDI four cylinder engine, significant reductions in particulate matter emissions were observed with blends of CETANER™ in diesel fuel. In this study, experiments were performed on a multi-cylinder Navistar 7.3L Turbodiesel engine confirmed and extended the observations from the earlier studies. This is an important step in not only showing that the fuel does perform on each type of engine in similar fashion, but also in showing that DME and its derivatives can give consistent, significant results in lowering emissions. The oxygenated fuels were blended to achieve a net addition of 2 wt.% oxygen in the blended fuel. A pressurized fueling system was developed

Chapman, Elana M., Bhide, Shirish V., Boehman, André L., Tijm, Peter J. A., Waller, Francis J.

Experimental Studies of the Impact of CETANER™ on Diesel Combustion and Emissions

2000-01-288610/16/2000

Oxygenated fuels have been used successfully as blending agents to improve combustion and reduce emissions from spark-ignition fuels. For compression-ignition engines, similar benefits may accrue from the use of oxygenated fuels and blending agents, however, the combustion and physical properties of the oxygenates appropriate for diesel applications are significantly different. In this study, a blend of 20% monoglyme and 80% diglyme, referred to as CETANER™, has been examined as a reformulating agent in a single-cylinder IDI diesel engine and a 4-cylinder DI turbodiesel engine. Gaseous and particulate emissions measurements, as well as pressure trace analyses, have been used to examine how this additive affects diesel combustion and emissions. This blend of glycol ethers has both a high cetane number and a high oxygen content; its performance stems from both characteristics. Blend ratios were considered that provided approximately 2, 4 and 6 wt.% oxygen to a premium diesel fuel. The

Hess, Howard S., Boehman, André L., Tijm, Peter J. A., Waller, Francis J.

Fuel Lubricity: Statistical Analysis of Literature Data

2000-01-191706/19/2000

A number of laboratory-scale test methods are available to predict the effects of fuel lubricity on injection system wear. Anecdotal evidence exists to indicate that these methods produce poor correlation with pump wear, particularly for fuels that contain lubricity additives. The issue is further complicated by variations in the lubricity requirements of full-scale equipment and the test methodologies used to evaluate the pumps. However, the cost of performing full-scale equipment testing severely limits the quantity of data available for validation of the laboratory procedures at any single location. In the present study, the technical literature was reviewed and all previously published data was combined to form a single database of 175 pump stand results. This volume of data allows far more accurate statistical analysis than is possible with tests performed at a single location. The results indicate differences in the effectiveness of the standardized laboratory-scale methods. The

Lacey, P. I., Mason, R. L.

Emissions Comparison of Alternative Fuels in an Advanced Automotive Diesel Engine

2000-01-204806/19/2000

Measurements of exhaust emissions were conducted for six alternative diesel fuels in a 2.2L, direct-injection diesel engine. Triplicate 13-mode, steady-state test sequences were performed for each fuel, as well as an ASTM D975 low sulfur No. 2 diesel (2DLS) control fuel, which served as the baseline. The alternative fuels include California Reference fuel, a low-sulfur diesel, a Fischer-Tropsch diesel, and three blends: 20 percent Fischer-Tropsch/80 percent low-sulfur diesel; 20 percent biodiesel/80 percent low-sulfur diesel; and 15 percent DMM/85 percent low-sulfur diesel. All six alternative fuel formulations demonstrated benefits by reducing particulate matter (PM) emissions without significant increases in oxides of nitrogen (NOx). The largest decrease in PM emissions was achieved with the 15 percent DMM blend. On average, over the 13 test points, the DMM blend reduced PM emissions by 52 percent in comparison to the baseline diesel fuel.

Sirman, M.B., Owens, E.C., Whitney, K.A.

Experimental Investigation on High-Quality Diesel Fuels Effects in a Light Duty CR Diesel Engine

2000-01-191106/19/2000

In this paper some preliminary results on the emission performance of a modern CR DI diesel engine running on reformulated diesel fuels are discussed. The engine employed in the tests was a Fiat M724 1910cc, installed on Alfa Romeo 156 1.9 JTD. Modern injection systems can modify the spray structure with respect to a spray of a classical rotary injection pump so the well-consolidated knowledge on the correlation between fuel parameters and pollutant emissions may not be valid for the new generation of DI diesel engines. Two high quality fossil fuels and a synthetic fuel were selected for the tests. Tests were directed to analyze the relative influence on exhaust emissions between injection parameters and fuel quality. One engine test point (2000 rpm × 2 bar of b.m.e.p.) was chosen, with different setting of injection pressure, EGR ratio and pilot injection activation. Moreover a comparison between the performance of the CR engine and a light duty DI engine equipped with a classical

Beatrice, C., Bertoli, C., Del Giacomo, N., Migliaccio, M.na.

The Effects of Oxygenate and Gasoline-Diesel Fuel Blends on Diesel Engine Emissions

2000-01-117303/06/2000

A study was performed in which the effects on the regulated emissions from a commercial small DI diesel engine were measured for different refinery-derived fuel blends. Seven different fuel blends were tested, of which two were deemed to merit more detailed evaluation. To investigate the effects of fuel properties on the combustion processes with these fuel blends, two-color pyrometry was used via optically accessible cylinderheads. Additional data were obtained with one of the fuel blends with a heavy-duty DI diesel engine. California diesel fuel was used as a baseline. The fuel blends were made by mixing the components typically found in gasoline, such as methyl tertiary-butyl ether (MTBE) and whole fluid catalytic cracking gasoline (WH-FCC). The mixing was performed on a volume basis. Cetane improver (CI) was added to maintain the same cetane number (CN) of the fuel blends as that of the baseline fuel. However, other fuel properties, such as density, distillation temperatures, and

Kweon, Chol-Bum, Foster, David E., Shibata, Gen

Potentiality of Oxygenated Synthetic Fuel and Reformulated Fuel on Emissions from a Modern DI Diesel Engine

1999-01-359510/25/1999

This paper presents the performances of a modern DI diesel engine, equipped with a Common Rail injection system, fed on blends of an advanced diesel fuel (base fuel) and Diethylene-Glycol-Dimethyl-Ether (Diglyme - C6H14O3). The base fuel was a reformulated diesel fuel with low aromatic and sulfur content. Three blends with different volumetric percentage of Diglyme (10, 20 and 30%) in the base fuel were prepared and tested. The engine was a FIAT M724, installed in a Alfa Romeo 156 1.9 JTD, with a Bosch Common Rail injection system (EDC-15C). At the exhaust of the engine, soot, NOx, HC, CO, and CO2 were measured. The experiments represent the potential of diesel reformulation technology with synthetic fuels coupled with the new diesel technology generation.

Beatrice, C., Bertoli, C., Del Giacomo, N., Migliaccio, M.na.

Diesel Fuel Lubricity: On the Path to Specifications

1999-01-147905/03/1999

During the last 10 years many researchers and technical groups have studied and performed tests in the area of diesel fuel lubricity [1]1. Protection of diesel engine fuel delivery system components from excessive wear has been the major mission of these efforts. Understanding of the issue, developing laboratory test methods, specifying appropriate fuel properties, and creating mechanical modifications to the equipment, as well as adding lubricity additives to the fuels, describes the bulk of the work which has been performed in this area. Technical groups from several organizations such as the Society of Automotive Engineers (SAE), the Coordinating European Council (CEC), and the International Organization for Standardization (ISO) have made substantial progress and some have come up with test methods and fuel specifications [2]. The working group at the American Society for Testing and Materials (ASTM) has been very active in recent years, but has not been able to define a diesel

Nikanjam, Manuch

A Comparison of Emissions from Clean Diesel Fuels

1999-01-112103/01/1999

Exhaust emissions from various kinds of clean diesel fuels were evaluated using a commercial DI diesel engine in comparison with the emissions from a commercial diesel fuel containing 0.05% sulfur. The blending of a light paraffinic fuel to a commercial diesel fuel reduces HC, CO, PM and NOx emissions and a light fuel with aromatics or kerosene reduces PM and NOx but not HC and CO. The PM and NOx emissions from the paraffinic fuel are lower than these from the kerosene, and these emissions are decreased with an increase in the blending ratio of both light fuels to a commercial diesel fuel. Reformulated diesel fuels such as a clean city diesel fuel and fuels with few aromatics reduce PM and NOx emissions more than commercial diesel fuel, and the reduction rate is highly dependent on aromatic content. The effects on emissions of blending soybean methyl ester or tripropylene glycol methyl ether to a commercial diesel fuel were evaluated. The results showed that the PM reduction rate

Uchida, Mitsuru, Akasaka, Yukio

Effect of Fuel Reformulation on Diesel Particulate Emissions – Application of DNA Adduct Test

98265010/19/1998

Effect of fuel reformulation (aromatics from 35 to 20 vol-%, sulfur from 0.05 to 0.005 wt-%) on exhaust emissions was measured from a car using ECE/EUDC tests. 14 PAHs, mutagenicity by Ames test and DNA adducts by using 32P-postlabeling were measured from the particulate soluble organic fraction (SOF). PAH-derived DNA adducts were measured in calf thymus DNA and human breast cancer MCF-7 cell line. Ames test and DNA adduct test measure the genotoxicity and metabolically activated PAHs in exhaust particulate SOF. PAHs, mutagenicity and DNA adducts were clearly reduced in SOF, which is a benefit caused by fuel reformulation.

Kuljukka, Terhi, Savela, Kirsti, Peltonen, Kimmo, Mikkonen, Seppo, Rantanen, Leena

Fuel Lubricity Reviewed

98256710/19/1998

Many components on both aircraft and ground vehicles rely on fuel for lubrication and cooling of sliding contacts. Reliable performance of these power sources depends on the fuel providing sufficient lubrication to protect each of the many contact types within the pump and injection system. This characteristic of fuel has come to be known as lubricity. The subject of fuel lubricity has gone through a number of phases, most of which resulted from changing the composition of the fuel, which historically has been driven by fuel stability and by environmental regulations. This paper reviews these phases in chronological order. Beginning with the fuel system failures reported in aviation equipment in the 1960s and 70s, through the Military experience with low lubricity kerosene fuels in compression ignition engines in the 80s and 90s, to the ongoing introduction of more severely refined diesel fuel in progress in many developed countries around the world. The paper tracks the principal wear

Lacey, P.I., Howell, S.A.

Lubricity of California Diesel Fuel

98136205/04/1998

Diesel fuel marketed in California has been subject to aromatic content and sulfur content standards since October 1993. Low sulfur diesel has been marketed in Southern California since 1988. To insure quality of the reformulated fuel, California Air Resources Board staff monitored the lubricity of California diesel from October 1993 through the end of 1996, using data from the Scuffing Load Ball-on-Cylinder Lubricity Evaluator (SLB-OCLE). Sulfur and aromatic content of sampled fuels were also determined. Over the three year period of the study, the production-weighted lubricity of California diesel was consistently at or near 3000 grams on the SLB-OCLE. The SLBOCLE results have improved over the course of this study, likely due to a shift in the formulation of diesel products marketed in California. Refiners have used lubricity additives in low sulfur, low aromatic content (10% volume) diesel. Rather than reducing aromatic content to 10%, many California refiners are now relying on

Cameron, Frances

Effects of Physical and Chemical Properties of Diesel Fuel on NOx Emissions of Heavy-Duty Diesel Engines

97299710/01/1997

In a diesel engine, both physical and chemical properties of the fuel affect exhaust emissions. This study focused on the separation of some physical and chemical effects of the fuel on the NOx emission. The tests were conducted with a bus engine using four diesel fuels with different density and aromatics levels. The measurements were performed using five injection timing settings to screen the effects of changes in actual injection timing. When conventional diesel fuel was replaced by reformulated diesel, NOx was reduced 7-13 %. Changes in the injection timing due to differences in the physical properties accounted only for a minor part (10-25 % relative) of the total reduction of NOx, whereas the greater part of the reduction (75-90 % relative) was due to other reasons, mainly fuel chemical properties.

Nylund, Nils-Olof, Aakko, Päivi, Mikkonen, Seppo, Niemi, Aapo

Reformulated Diesel Fuel - Four Years Experience in Finland

97163405/01/1997

Diesel fuel was reformulated by reducing sulfur to < 0.005 wt-%, aromatics to < 20 vol-% and by limiting heavy polyaromatics. This reduced NOx, particulate, PAH and mutagenic emissions plus exhaust odor. Oxidation catalysts operated well. Less deposits formed in the EGR system. Fuel lubricity was enhanced by additives evaluated by injection pump tests and HFRR. Three years of field testing with 140 buses showed no fuel related problems. Oil change period could be lengthened and fuel consumption was unchanged. Demand for reformulated fuel was triggered by differentiating taxation based on quality. Fuels have been used since 1993 without problems. Life cycle analysis showed no increase of CO2.

Mikkonen, Seppo, Kiiski, Ulla, Mäkelä, Martti, Niemi, Aapo, Niemi, Markku, Rantanen, Leena, Saikkonen, Pirjo

Maryland Mass Transit Administration Demonstration of Liquefied Natural Gas Transit Buses

97166605/01/1997

The Maryland Mass Transit Administration conducted an LNG transit bus demonstration in Baltimore, Maryland. A refueling facility was constructed and maintenance facilities were modified to provide support for the demonstration. During the demonstration operational data were collected on the buses and facilities. Problems encountered with the vehicle LNG fuel systems are reviewed and discussed. This paper summarizes the findings and operation of the LNG fleet during the demonstration and projects future LNG vehicle and operational costs.

Bechtold, Richard L., Gibbs, Jerry L.

The Influence of Fuel Formulations on Pollutant of a Light Duty D.I. Diesel Engine

96197210/01/1996

This paper reports some results of a research carried out under part sponsorship of the Commission of the European Communities in the framework of the Joule II program. A twelve fuels matrix, derived from very different formulation techniques like hydrotreatment, Fisher Tropsch process, oligomerization and addition of oxygenated compounds to the straight run was tested. Istituto Motori performed tests on a turbocharged, after-cooled, direct injection diesel engine of two liter total displacement. It was equipped with an electronic E.G.R. system. Tests were performed in steady state conditions, representative of transient European schedules. Regulated and unregulated emissions was measured. Further tests were performed in cold conditions, the coolant temperature at the engine outlet was kept below 10°C in order to enhance the behavior of different fuels in producing regulated and unregulated emissions. Some interesting correlation between pollutant emissions and fuel parameters were

Beatrice, C., Bertoli, C., Del Giacomo, N.

Lubricity of Reformulated Diesel Fuel - Experience in Finland

96194810/01/1996

Lubricity testing of reformulated diesel fuels (sulfur <0 005 w-%, aromatics <20 vol-%) was started in 1990. A 1000 hour in-house test rig with distributor pumps was used for testing fuels and additives. When lubricity is not adequate, excessive wear is seen in the pump. A field test on 140 buses each accumulating 150 000 - 250 000 km with reformulated diesel was carried out. Reformulated diesel has been on the market since 1993 without problems. Lubricity was evaluated with HFRR test and compared to the pump rig results. HFRR overestimated the need for lubricity additives. Fuel sulfur was found to be not the only indicator of lubricity and lubricity of low sulfur diesel was as good as high sulfur when other fuel parameters were kept constant.

Saikkonen, Pirjo, Mikkonen, Seppo, Makela, Martti, Niemi, Aapo

Effect of Reformulated Diesel Fuel on Unregulated Emissions of Light Duty Vehicles

96197010/01/1996

Unregulated emissions of reformulated diesel fuels (sulfur < 50 ppm, aromatics < 20 vol-%) were compared to the European EN590 specification fuel (sulfur < 500 ppm, aromatics < 35 vol-%) in three IDI passenger cars and one DI van using FTP and/or ECE/EUDC emission test procedures. The effect of reformulated diesel fuels on the mutagenicity of particulate soluble organic fraction (SOF) was studied. Fuel reformulation reduced particulate emissions in IDI cars. Reformulating fuel by decreasing heavier aromatics - without decreasing final boiling point - reduced particulate mutagenicity on emission basis. At low ambient temperature (-7°C) particulate PAH and mutagenic emissions increased compared to the standard ambient temperature (+22°C) with all fuels.

Aakko, Päivi, Lappi, Maija, Rantanen, Leena, Juva, Ari, Niemi, Aapo, Mikkonen, Seppo

Development of a Screening Test for Evaluating Detergent/Dispersant Additives to Diesel Fuels

96118405/01/1996

A simple, relatively short and inexpensive screening test method has been developed for evaluation of available detergent/dispersant diesel fuel additives. The screening test is based on experiments of running a laboratory diesel engine in a pre-determined regime(load cycle). The engine is a single cylinder, 4-stroke DI, naturally aspirated and air cooled. It is coupled to a generator feeding electrical heaters as the load. The test rig is controlled electronically to enable fully automatic test bench operation, including start/stop, load change, emergency shut-down, etc. The experiments were performed by running the engine on a reference base fuel and then the same fuel with different detergent additives. The nozzle of the fuel injector was checked for clogging by air flow measurements, using the ISO-4010 test rig. The conclusions drawn from the analysis of the test results are that the method employed here for evaluating the detergent/dispersant additives is effective and has

Gutman, Marcel, Tartakovsky, Leonid, Kirzhner, Yoseph, Zvirin, Yoram

Diesel Fuel Lubricity: A Survey of 1994/95 Canadian Winter Diesel Fuels

96118105/01/1996

A total of 54 Canadian Diesel Fuels were sampled in the winter of 1994/95. Both Regular and Low Sulfur (less than 500 ppm by mass sulfur) fuels were sampled. All the fuels were obtained directly from refineries and were intended for commercial sale. The fuel samples were evaluated for lubricity, as measured by the High Frequency Reciprocating Rig (HFRR) at 25 °C, and by the Scuffing load BOCLE (SLBOCLE) as developed by the Southwest Research Institute. Various relevant inspection properties were also determined. Total aromatic content and aromatic type (mono, di or poly) of the samples was also determined by High Pressure Liquid Chromatography (HPLC). The lubricity evaluations obtained are discussed, and compared to the other parameters obtained.

Mitchell, Ken

Effect of Diesel Fuel Composition on Fork-Lift Truck Emissions

95236510/01/1995

Diesel fork-lifts are often preferred over LPG due to lower costs and superior fire safety in in-door use but exhaust causes problems. Air quality was measured with standard and reformulated diesel fuel in a warehouse where diesel fork-lifts operated. Sulphur was 605 ppm for the standard and 7 ppm for the reformulated fuel. Aromatics were respectively 31 vol-% and 12 vol-% and 95-% distillation points 352 °C and 286 °C. Fuel reformulation reduced particulates in the ware-house air by 40 %, particulate SOF by 50 % and mutagenicity of SOF by 80 %. NO, NO2, SO2 and PAH concentrations were low. Irritation and the possibility of long-term health problems reduced.

Nylung, Lars, Kociba, Pirkko, Mikkonen, Seppo, Rantanen, Leena, Alve, Veli-Matti, Korhonen, Kari, Lindroos, Lasse

Estimation of Diesel Fuel Effects Benefits on a Representative Engine of the Urban Transport Fleet in Venezuela

94240911/01/1994

Fuel reformulation represents a major approach to reduce emissions in the current fleet. In this work, a medium-duty engine was used to determine the potential benefits of using reformulated Diesel fuel with controlled composition. This particular engine technology is used approximately in more than 60% of the corresponding transport fleet. The fuel properties that received special attention were sulfur content (390 - 8670 ppm), aromatic content (9.8 - 32.6 wt %), cetane number (40 - 51.6) and distillation temperature for 90 % volume recovered T90 (307 - 350 °C). Testing was conducted on the engine installed on a test bench and operated on a 4-mode cycle with two speeds and medium to high load. Data was taken on each mode and statistical procedures for averaging, weighting and analyzing, were applied to study engine operation. Combustion performance was observed based on a heat release analysis, comparing burning rates and ignition delay. Exhaust emissions of HC, CO, NOx and specific

González, Manuel A., Leon, Aymara

The Lubricity of Deeply Hydrogenated Diesel Fuels - The Swedish Experience

94201610/01/1994

Environmentally adapted diesel fuels defined by the Swedish Government contain extremely low levels of sulphur and have limited aromatics contents. Road trials and pump durability tests of these fuels revealed unacceptable wear in injection pumps due to low lubricity. Additive solutions were identified using bench tests and then proven in field trials. Market experience has substantiated the findings that fuels using the chosen additive give fully satisfactory performance. This paper illustrates how practical solutions to lubricity questions can be found, and is applicable wherever specifications demand fuels requiring a high degree of hydroprocessing.

Stradling, R. J., Wolveridge, P. E.

Lubricity of Low Sulfur Diesel Fuels

93274010/01/1993

The sulfur content of all highway diesel fuel was required to be reduced to a maximum of 0.05 wt % starting October 1993. This federal requirement results in further fuel processing by refineries. The hydrotreating process used to reduce fuel sulfur has the potential to reduce the fuel's lubricating characteristics. Fuel producers and fuel injection equipment suppliers have been concerned about the likelihood of increased component wear upon the introduction of these new fuels. Low sulfur fuels have been produced and marketed in Southern California since 1985 with no apparent evidence of any field problem. Nevertheless, concern outside of this area exists. Therefore, one such fuel with a sulfur content well below 0.05% was used to conduct a vehicle test to evaluate its effect on the fuel injection pump. This fuel and a low aromatics diesel fuel were used to investigate the effect of various levels of two different sulfur compounds on the lubricity characteristics of the fuels. The

Nikanjam, Manuch, Henderson, Paul T.

A Low Emission Diesel Fuel: Hydrocracking Production, Characterization and Engine Evaluations

93273110/01/1993

The new regulations for emissions in USA (California and other States), introduce a new quality requirement for diesel formulations. As an answer to these problems Intevep, S. A., has developed a hydrocracking processing technology, a very flexible process able to operate up to 100 % of cracked material and with a mixture of light to heavy gas oil in any proportion, and which operates at moderate pressure. The proper balance between hydrogenation and mildhydrocracking is obtained through controlling the temperature and by tayloring the catalyst composition. Production of diesel fuel with less than 10 % wt aromatics was targeted, in a scenario of minimum hydrogen availability. Very low sulfur levels are achieved and the aromatic fraction is composed mostly of mono-aromatic compounds. Tests were conducted using a commercial Isuzu diesel engine, installed on an engine test bench and operated on a 7-mode cycle. Data was taken on each mode and statistical procedures for averaging, weighting

González D., Manuel A., B., Guillermo Rodríguez, Galiasso, Roberto, Rodriguez, Edilberto

Effect of Fuel on the Regulated, Unregulated and Mutagenic Emissions of DI Diesel Engines

93268610/01/1993

Emissions of heavy duty engines using hydrocarbon fuels and rape seed methyl ester (RME) were measured according to the ECE R49 test procedure. The effect of fuel density on engine power was taken into account in the ECE R49 tests. The two reformulated fuels tested had sulphur below 50 ppm, aromatics below 20 vol-%, cetane number over 49 and reduced triaromatic content. Particulates were measured in a AVL Mini Dilution Tunnel 474 and gaseous unregulated hydrocarbons by Siemens FTIR. Reformulation reduced NOx by 5 to 12 %, particulates by 10 to 25 % and Ames mutagenicity by 56 to 74 %. RME increased NOx by 4 to 9 %, reduced particulates by 0 to 33 % and the mutagenicity by 17 %. Cetane number was found to be not important in reducing emissions. Low fuel triaromatic and low particulate PAH content reduced the mutagenicity of particulates.

Nylund, Lars, Kociba, Pirkko, Rantanen, Leena, Mikkonen, Seppo, Lappi, Maija, Nylund, Nils-Olof

Diesel Fuel Additives and Emission Reductions in Southern California

93276610/01/1993

This is a statistical analysis of multiple large-scale, on-the-road tests by municipal transit authorities, U.S. Military agencies, and others in California, Arizona, and New York City. From a study of 28 diesel additives three proprietary diesel fuel additives have been identified which consistently yield significant energy savings and opacity improvements at the 95% confidence level. Chassis dynamometer tests support reported fuel savings and associated reductions in NOx, HC, CO and PM emissions. Use of such additives in the South Coast Basin would save 92 million gallons of diesel fuel annually, and three times that if used statewide in California. Surplus emission reductions (beyond what is required by current or proposed regulations) from using one of these diesel additives in the South Coast Air Basin would be:

Haring, Joseph E.

Effects of Fuel Properties and Composition on the Temperature Dependent Autoignition of Diesel Fuel Fractions

92222910/01/1992

The work described in this paper includes the preparation and combustion testing of fuels that consist of fractions of several different distillate materials that represent different feed stocks and different processing technology. Each of the fuels have been tested in a constant volume combustion apparatus to determine the relationship between ignition delay time, temperature and cetane number. These relationships are discussed in terms of the composition and properties of each fraction, and the processing that each of the feedstocks were exposed to.

Ryan, Thomas W., Erwin, Jimell

Effect of Low-Lubricity Fuels on Diesel Injection Pumps - Part II:Laborator Evaluation

92082402/01/1992

This paper is the second of two that describe the effects of low-lubricity fuels on diesel injection pump performance. The first paper describes the primary failure mechanisms and wear processes in a number of failed pumps removed from both military and civilian vehicles that had been operated on Jet A-1 and diesel fuels. However, the multitude of unregulated parameters in practical operation renders quantitative comparison between different fuels and pump combinations impractical. This paper describes the degradation in pump performance and the wear processes associated with fuels of varying lubricity in the well-defined environment of a pump test stand. The test methodology concentrates on those areas previously demonstrated to be most susceptible to wear. The results indicate that pump durability is reduced by highly refined low-viscosity fuels, but may be successfully counteracted by either improved metallurgy or lubricity additives. The measured wear rate from the full-scale pump

Lacey, Paul I., Lestz, Sidney J.

Toward Improved Diesel Fuel

91232510/01/1991

Engine hardware modifications, fuel and lube oil properties, electronic controls, and aftertreatment devices may all play a role in meeting future heavy-duty diesel engine emission standards. Detroit Diesel Corporation (DDC) is actively involved in evaluating the contributions of these technologies to reduce emissions as well as evaluating the impact on initial and life cycle system cost, fuel consumption, reliability and durability. This paper focuses on the potential of low emission diesel fuels to contribute to lower engine-out emissions. DDC has been testing low emission diesel fuels with low sulfur and aromatics and higher cetane number, synthetic diesel fuels, and today's fuels with various additives. Other industry programs have generated similar data. These results have led us to the conclusion that a significant contribution can be made by tailoring future diesel fuels to produce low emissions. While more work needs to be done to identify what a low emission diesel fuel

Bennethum, James E., Winsor, Richard E.

Demonstration of Durable Retrofit Diesel Particulate Trap Systems on an Urban Bus and Class 8 Truck, 1990

90011002/01/1990

Progress is reported on a project to evaluate the potential of diesel particulate trap systems for retrofit application to reduce emissions from buses and trucks in the State of California. A trap system was selected for evaluation, based on availability of commercial prototypes at the time of the project. Engine dynamometer testing of this trap system is reported over advanced design bus cycles. The results showed that the system is viable for application to a bus equipped with a Detroit Diesel Corporation 6V-92TA diesel engine, producing satisfactory exhaust backpressure and emission characteristics over a 500 hour test period. Work is now proceeding on field testing of this system on a transit coach, and engine dynamometer and field testing of a similar system on a truck equipped with a Cummins NTC 350 diesel engine.

Lawson, Alex, Ha, Kong, Carmichael, Ian

Diesel Fuels

J313_198906 (Historical)06/01/1989

Automotive and railroad diesel fuels, in general, are derived from petroleum refinery products which are commonly referred to as middle distillates. Middle distillates represent products which have a higher boiling range than gasoline and are obtained from fractional distillation of the crude oil or from streams from other refining processes. Finished diesel fuels represent blends of middle distillates. The properties of commercial distillate diesel fuels depend on the refinery practices employed and the nature of the crude oils from which they are derived. Thus, they may differ both with and within the region in which they are manufactured. Such fuels generally boil over a range between 163 and 371 °C (325 to 700 °F). Their makeup can represent various combinations of volatility, ignition quality, viscosity, sulfur level, gravity, and other characteristics. Additives may be used to impart special properties to the finished diesel fuel.

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313_198706 (Historical)06/01/1987

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313_198606 (Historical)06/01/1986

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313_198406 (Historical)06/01/1984

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313_198204 (Historical)04/01/1982

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313_198006 (Historical)06/01/1980

Fuels and Lubricants TC 7 Fuels Committee

Diesel Fuels

J313C_197805 (Historical)05/01/1978

Fuels and Lubricants TC 7 Fuels Committee

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