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Effect of operating conditions on gas components in the partial coal gasification with air/steam
Yaji Huang,Baosheng Jin,Zhaoping Zhong,Rui Xiao,Hongcang Zhou 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.4
increasing environmental considerations and stricter regulations, coal gasification, especially partialcoal gasification, is considered to be a more attractive technology than conventional combustion. Partial coal gasifica-tion was conducted in detail under various experimental conditions in a lab-scale fluidized bed to study the factors thataffected gas components and heating value, including fluidized air flow rate, coal feed rate, and steam feed rate, gas-ification temperature, static bed height, coal type and catalyst type. The experiment results indicate that gasificationtemperature is the key factor that affects components and the heating value of gas is in direct proportion to gas-bed height, which show more complex effect on gas components. High rank bitumite coal is much more suitable forgasification than low rank bitumite coal. The concentrations of H2, CO and CH4 of bitumite coal are more than thoseof anthracite coal. Compounds of alkali/alkaline-earth metals, such as Ca, Na, K etc., enhance the gasification rate con-siderably. The catalytical effects of Na2CO3 and K2CO3 are more efficient than that of CaCO3.