The Main Regularities of Ignition and Combustion of Coal-Water Fuels Produced from Brown, Flame and Gas Coals

Abstract:

An experimental investigation was carried out of coal-water fuel (CWF) drops ignition and combustion. CWF examples were produced by using of coal of different metamorphic stages, including brown coal, flame coal, and gas coal. The processes of combustion and ignition of CWF took place in the air. Time-temperature dependences of ignition and combustion processes were obtained; basic stages of CWF combustion were established and investigated; combustion completeness was defined and ash residue structure and properties were investigated during the experimental research. Influence of the working medium temperature on the time duration of each burning stage was defined. Generalization of results was carried out. It is shown, that duration of the volatiles combustion stage doesn’t depend on the medium temperature and stay constant for each of coal grade. Time interval before CWF ignition can be described with power-type dependence, which is identical for all metamorphic stages of coal. The maximum temperature of CWF combustion grows linearly in respect to the medium temperature in the oven.

• Periodical: International Journal of Engineering Research in Africa (Volume 37)
• Pages: 141-157
• DOI: https://doi.org/10.4028/www.scientific.net/JERA.37.141
• Online since: August 2018
• Authors: Valeriya Pinchuk*
• Keywords: Coal Metamorphism, Coal-Water Fuel, Combustion, Combustion Completeness, Ignition, Time-Temperature Characteristics

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