Testing of Syntroleum Synthetic Diesels in Diesel Generators Suitable for Alaska

Telang, Aseem; Witmer, Dennis; Lin, Chuen-Sen; Schmid, Jack; Johnson, Thomas H.; Kenny, Tristan

doi:10.1115/icef2006-1588

Cited by 2 publications

(7 citation statements)

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“…The test for the synthetic fuel and the conventional diesel was conducted much earlier due to the time availability of the synthetic fuel. Comparison in exhaust emissions between the synthetic fuel and the conventional diesel had been performed in a previous project; results were given in [4]. Because the tests of the two parts were carried out more than one year apart and the testing environment conditions were different, the results of the studies of the two parts were discussed separately.…”

Section: )mentioning

confidence: 99%

“…Synthetic diesel matches the sulfur content requirement and may become an important fuel of the future. Since the fuel composition and combustion performance of synthetic fuels [4,5] are known to be different from conventional diesel, the heat content and temperatures of the exhaust for these two fuels may be appreciably different, resulting in a difference in the amount of recoverable heat. An experiment to determine exhaust heat content and temperature (i.e., heat quality) was conducted on synthetic fuel and a conventional diesel.…”

Section: Exhaust 30%mentioning

confidence: 99%

“…These standards are scheduled to be extended to 2011 for off-road engines. One way of reducing sulfur is to use synthetic diesel (ULSD) created by Fischer-Tropsch, which has near-zero sulfur [4,7]. This would largely reduce the problem of corrosion due to acids.…”

Section: Low-sulfur Fuelsmentioning

confidence: 99%

“…The tests were conducted for 50% load and 100% load. Exhaust emissions had been measured in previous work [4] for NO x , CO, and THC.…”

Section: Synthetic Fuelmentioning

confidence: 99%

“…Conventional diesel sold for transportation in the United States after 2001 contains a maximum of 500 ppm of sulfur [4,5]. This sulfur gets oxidized to sulfur dioxide (SO 2 ) or sulfur trioxide (SO 3 ) after combustion.…”

Section: Low-sulfur Fuelsmentioning

confidence: 99%

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Capture of Heat Energy from Diesel Engine Exhaust

Lin¹

2008

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Diesel generators produce waste heat as well as electrical power. About one-third of the fuel energy is released from the exhaust manifolds of the diesel engines and normally is not captured for useful applications. This project studied different waste heat applications that may effectively use the heat released from exhaust of Alaskan village diesel generators, selected the most desirable application, designed and fabricated a prototype for performance measurements, and evaluated the feasibility and economic impact of the selected application. Exhaust flow rate, composition, and temperature may affect the heat recovery system design and the amount of heat that is recoverable. In comparison with the other two parameters, the effect of exhaust composition may be less important due to the large air/fuel ratio for diesel engines. This project also compared heat content and qualities (i.e., temperatures) of exhaust for three types of fuel: conventional diesel, a synthetic diesel, and conventional diesel with a small amount of hydrogen. Another task of this project was the development of a computeraided design tool for the economic analysis of selected exhaust heat recovery applications to any Alaskan village diesel generator set.The exhaust heat recovery application selected from this study was for heating. An exhaust heat recovery system was fabricated, and 350 hours of testing was conducted. Based on testing data, the exhaust heat recovery heating system showed insignificant effects on engine performance and maintenance requirements. From measurements, it was determined that the amount of heat recovered from the system was about 50% of the heat energy contained in the exhaust (heat contained in exhaust was evaluated based on environment temperature). The estimated payback time for 100% use of recovered heat would be less than 3 years at a fuel price of $3.50 per gallon, an interest rate of 10%, and an engine operation of 8 hours per day. Based on experimental data, the synthetic fuel contained slightly less heat energy and fewer emissions. Test results obtained from adding different levels of a small amount of hydrogen into the intake manifold of a diesel-operated engine showed no effect on exhaust heat content. In other words, both synthetic fuel and conventional diesel with a small amount of hydrogen may not have a significant enough effect on the amount of recoverable heat and its feasibility.An economic analysis computer program was developed on Visual Basic for Application in Microsoft Excel. The program was developed to be user friendly, to accept different levels of input data, and to expand for other heat recovery applications (i.e., power, desalination, etc.) by adding into the program the simulation subroutines of the desired applications. The developed program has been validated using experimental data.

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Section: )mentioning

confidence: 99%

Section: Exhaust 30%mentioning

confidence: 99%

Section: Low-sulfur Fuelsmentioning

confidence: 99%

“…The tests were conducted for 50% load and 100% load. Exhaust emissions had been measured in previous work [4] for NO x , CO, and THC.…”

Section: Synthetic Fuelmentioning

confidence: 99%

Section: Low-sulfur Fuelsmentioning

confidence: 99%

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Capture of Heat Energy from Diesel Engine Exhaust

Lin¹

2008

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An experimental feasibility study of using diesel exhaust for space heating in Alaskan Villages

Raghupatruni

Lin

Witmer

et al. 2008

WIT Transactions on Engineering Sciences

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In rural Alaska, there are nearly 180 villages consuming about 374,000 MWh of electrical energy annually from individual diesel generators. A similar amount of fuel energy is dissipated into the atmosphere from diesel exhaust. Due to the isolation and small populations of the villages, the costs of fuels, components, and maintenance are extremely high and one of the policies in management is to minimize the possibilities of power outrage and the frequency of maintenance. Also due to the potential of corrosion and soot accumulation in exhaust heat recovery systems, exhaust heat recovery has long been avoided. Recently, the surge in fuel prices, the new regulation requiring ultra low sulfur diesel, and the desire to reduce green house gas has led to exhaust heat recovery being reconsidered for improving the energy efficiency of rural Alaskan diesel power plants. This report discusses the selection of different exhaust heat recovery applications to the villages, the design of an experimental system that simulates different space heating methods used in villages, system fabrication, instrumentation, system performance, feasibility and economic analysis. Performance presented includes the effect of the heat recovery system on engine performance, heat recovery effectiveness, measured soot accumulation and the effect of fouling on heat recovery effectiveness, and the estimated maintenance requirement.

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Testing of Syntroleum Synthetic Diesels in Diesel Generators Suitable for Alaska

Cited by 2 publications

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Capture of Heat Energy from Diesel Engine Exhaust

Capture of Heat Energy from Diesel Engine Exhaust

An experimental feasibility study of using diesel exhaust for space heating in Alaskan Villages

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