加压流化床煤气化计算模型研究  

Simulation Modelling of Coal Gasification in Pressurized Fluidized Bed

作　　者：陈丽芳[1] 朴桂林[1] 张居兵[1] 谢浩[1] 森滋勝[2] 

机构地区：[1]南京师范大学能源与机械工程学院,南京210042 [2]名古屋大学化学工学科

出　　处：《动力工程学报》2014年第2期134-139,158,共7页Journal of Chinese Society of Power Engineering

基　　金：江苏省自然科学基金面上项目(211330B3121);江苏省高校自然科学基金资助项目(2010112TSJ0105)

摘　　要：为了探索大型加压流化床煤气化的最佳操作条件和设计参数，建立了针对加压流化床气化方式的计算模型，包括颗粒模型、气相模型、气泡模型和焓平衡模型，分析了单位给煤量、氧量和水蒸气等操作参数对碳转化率、产气量和冷煤气效率等参数的影响，并确定了给煤量的最佳操作范围．结果表明：初期碳转化率均保持在99％以上，对于相同床面积的气化炉，可通过提高反应压力来提高气化炉处理量；反应压力由1．5MPa提高到2．1MPa时（提高40％），单位煤产气量可增加34％以上；反应压力为2．1MPa时，给煤量的最佳操作范围为2．0～2．5kg／（m^2·s）；氧煤比为0．6～0．7时，冷煤气效率可达到77％；生成气体的热值与水蒸气比成正比．To find the optimum operating conditions and design parameters for coal gasification of large-size pressurized fluidized bed,a number of simulation models were built up,including the solid particle model,gas-phase model,hydrodynamic model of bubbles and the enthalpy balance model,etc.,based on which the effects of following factors on the carbon conversion rate,gas production rate and cold gas efficiency were analyzed,such as the coal feed rate,the oxygen mass and the steam flow,etc,and subsequently the optimum range of coal feed rate was determined.Results show that the carbon conversion rate is kept at a level higher than 99% in the initial stage,and for gasifiers with same bed area,their handling capacity may be increased by raising the operation pressure; the gas production rate per kilogram of coal will be increased by 34%,when the operation pressure is raised from 1.5 MPa to 2.1 MPa （raised by 40%） ; for an operation pressure of 2.1 MPa,the optimum range of coal feed rate is from 2.0 kg/（m2 · s） to 2.5 kg/ （m2 · s）; the cold gas efficiency may get up to 77% when the oxygen-coal ratio is in 0.6-0.7; the heating value of generated gas is in direct proportion to the steam-air ratio.

关 键 词：煤气化 加压流化床 颗粒模型 气相模型 数值模拟 

分 类 号：TQ546[化学工程—煤化学工程]