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Title: Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects

Abstract

This report contains the listing for an engine cycle simulation computer program for modeling conventional medium-speed engines with overall equivalence ratios of less than .8 and with low or no swirl. (JDL)

Authors:
;
Publication Date:
Research Org.:
Texas A and M Univ., College Station, TX (USA). Dept. of Mechanical Engineering
Sponsoring Org.:
DOE/FE
OSTI Identifier:
7009116
Report Number(s):
DOE/MC/23256-2787-Vol.2
ON: DE90000450
DOE Contract Number:
AC21-86MC23256
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; DIESEL ENGINES; COMPUTERIZED SIMULATION; COMBUSTION; COMPUTER PROGRAM DOCUMENTATION; FUELS; PROGRESS REPORT; CHEMICAL REACTIONS; DOCUMENT TYPES; ENGINES; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; OXIDATION; SIMULATION; THERMOCHEMICAL PROCESSES; 330102* - Internal Combustion Engines- Diesel; 990200 - Mathematics & Computers

Citation Formats

Caton, J. A., and Annamalai, K.. Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects. United States: N. p., 1989. Web. doi:10.2172/7009116.
Caton, J. A., & Annamalai, K.. Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects. United States. doi:10.2172/7009116.
Caton, J. A., and Annamalai, K.. Fri . "Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects". United States. doi:10.2172/7009116. https://www.osti.gov/servlets/purl/7009116.
@article{osti_7009116,
title = {Development and use of an advanced coal-fueled diesel engine cycle simulation with group effects},
author = {Caton, J. A. and Annamalai, K.},
abstractNote = {This report contains the listing for an engine cycle simulation computer program for modeling conventional medium-speed engines with overall equivalence ratios of less than .8 and with low or no swirl. (JDL)},
doi = {10.2172/7009116},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 1989},
month = {Fri Dec 01 00:00:00 EST 1989}
}

Technical Report:

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  • The main objective of this study is to include the group effects of the vaporization and combustion processes in a CWS-fueled cycle simulation of a C.I. engine. A secondary objective of this study is to make additional improvements to the simulation, and to complete a parametric study of input parameters on performance, combustion conditions, and in-cylinder processes. The improvements to the simulation are the addition of a transient Nusselt number calculation for the heat transfer to the droplets, new flexibility in the entrainment model, the possibility of mass and diameter injection profiles other than the previously used top-hat'' profile, andmore » a new devolatilization model. The next section presents a review of previous research efforts into both experimental coal-fueled engines, CWS-fueled engine cycle simulations, and analytical studies of group combustion behavior. Next, the model used in the current study is described. Finally, results from this study are presented and discussed followed by conclusions based on these results.« less
  • This project is part of a longer-range program in which the objective is to establish a high efficiency prototype industrial power system that can burn coal directly. The power system consists of a slow-speed, two-stroke diesel engine and a fuel preparation system which provides clean micronized coal in water slurry for use as the primary fuel. The project is divided into five tasks. This topical report is concerned with the subject of Task 3. Task 3 consists of two parts: (1) single-cylinder engine test facility requirements and preparation; and, (2) multi-cylinder prototype engine system development plan.
  • Purpose of the program is to foster the long-range development of a coal/water slurry fuel fired slow-speed, two-stroke diesel engine for efficient and economical power generation in the 8 to 30 MW range for use in industrial cogeneration applications. This report covers the results obtained in Task 4.0, Engine Test, in which four micronized and beneficiated coal/water slurries were utilized as a fuel in a single-cylinder version of the slow-speed, two-stroke diesel engine. Thermal performance, emissions and engine wear are reported on and evaluated in this report, based on the results of the testing program. The results of the programmore » show that the slow-speed, two-stroke diesel engine can operate on coal/water slurry fuels at efficiencies approximately equal to those obtained with conventional liquid fuels and produces considerably lower amounts of exhaust emissions. The engine wear, particularly at the piston ring/cylinder liner interface is considerably greater than that which occurs with liquid fuels. However, it is concluded that by means of technological advances regarding cylinder liner and ring materials, design changes, and new concepts for the lubrication system, a reliable and economical coal/water slurry fired slow-speed engine can be developed.« less
  • This paper reports on an existing coal-water slurry fueled diesel engine cycle simulation modified to include particle-to-particle and droplet-to-droplet interactions during the combustion and vaporization processes. Two aspects of these interactions, known as group effects, were considered. Group Effect Number 1 (GE1) relates to the species concentrations and temperature profiles between particles during combustion and between droplets during vaporization. Group Effect Number 2 (GE2) relates to the blockage of air entrainment to the fuel region due to the large momentum flux of volatiles and CO during combustion or water vapor during vaporization.
  • In prior work with the coal fired diesel research engine, a necessity to determine the sensitivity of the engine to a wider range of fuels was resolved and included in the R and D Test Plan submitted on 2/9/89. In general, the economic viability and universal acceptance of the commercial engine will be a factor of its ability to tolerate the widest range of source fuels with minimal fuel beneficiation. As detailed in the R and D Test Plan, a preliminary investigation on the effects of coal-water slurry (CWS) fuels on the combustion in a GE single cylinder test enginemore » was conducted. The following conclusions are obtained from this investigation. All the test CWS fuels were successfully burned in the GE engine combustion system. They include: 3 to 15 microns mean particle size; 0.7 to 2.8% ash level; KY Blue Gem and PA Mariana bituminous coal, WY Kemmer and Spring Creek Sub-Bituminous coal; coal beneficiated with physical and chemical processes; two kinds of additives for OTISCA CWS; and burnout is not effected by ash or particle size within the test range. For each kind of CWS fuel, the detail design parameters of the fuel injection system has to be compatible. With sufficiently high fuel injection pressure, the 3 micron mean particle size OTISCA fuel burns faster than the 5 micron ones. For OTISCA fuel, the burn rate using Ammonium Lignosulfonate as additive is faster than using Ammonium Condensed Naphthalene Sulfonate. Appendices contain data on heat release, fuel characterization reports from two laboratories, general engine test data, and particulate size distribution. 3 refs.« less