石炭ガス化中カロリー燃料用ガスタービン燃焼器 : 第2報,希薄燃焼によるNO_x低減強化型燃焼器の高圧燃焼特性(熱工学,内燃機関,動力など)

概要

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The "integrated coal gasification combined cycle" (IGCC) requires the development of a gas turbine combustion technology using gasified coal fuel, which has high thermal efficiency and low NO_x emission. Medium-Btu fuel produced in an oxygen-blown coal gasifier has a calorific value of 9-13 MJ/m^3, which is around one fifth that of natural gas. However, the flame temperature of medium-Btu fuel is higher than that of natural gas and so NO_x emission is expected to increase significantly. Moreover, flame temperature rises in proportion to the rise in a calorific value of medium-Btu fuel. We have developed a combustion method with nitrogen injection, which is produced in the air-separation unit, and lean combustion, designed mainly for achieving low NO_x emission and stable combustion. Under operational conditions, NO_x emission is reduced significantly, while flame stability maintained. In this report, we will clarify the influence of pressure on the NO_x emission in the medium-Btu fueled combustion, propose the low NO_x combustion technology for gasified coal fuel, and provide useful engineering guidelines for the development of the gas turbine combustor.
社団法人日本機械学会の論文
2003-10-25