Plasma gasification of coal in various media
DOI:
https://doi.org/10.18321/cpc549Keywords:
coal, gasifying agent, plasma gasification, synthesis gas, energy efficiencyAbstract
Numerical experiments on plasma gasification of coal in various gasifying agents (air, carbon dioxide, steam, oxygen, and mixtures of steam with air, steam with oxygen, steam with carbon dioxide) were performed using the Plasma-Coal kinetic program. Numerical experiments were carried out in relation to a flow-through cylindrical plasma gasifier with a combined zone of release and absorption of heat in the process of thermochemical transformations of coal in gasifying agents. Heating of the gasifying agent,
coal particles and their gasification takes place in the plasma gasifier. Calculations have shown that the maximum concentration of synthesis gas in the coal gasification products of the Powder River Basin is observed during steam-carbon dioxide, carbon dioxide, steam, steam-oxygen and oxygen gasification. The maximum yield of hydrogen (51.4%) is achieved with steam gasification of coal. The energy efficiency of the considered processes of coal gasification, with the exception of oxygen and steam-oxygen gasification, varies in a relatively narrow range of 1.6-2.5 kW/kW. With steam-oxygen and oxygen gasification of coal, the energy efficiency noticeably increases to 3.5 and 11.4 kW/kW, respectively. Very important for reducing emissions of the main greenhouse gas (CO2) is the possibility of using it as a gasification agent in the processes of steam-carbon dioxide and carbon dioxide gasification of coal with an energy efficiency of the process exceeding that of air gasification of coal.
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