气流床粉煤气化的Gibbs自由能最小化模拟  

Thermodynamic analysis of entrained-flow pulverized coal gasification by Gibbs free energy minimization

作　　者：代正华[1] 龚欣[1] 王辅臣[1] 于广锁[1] 谭可荣[2] 于遵宏[1] 

机构地区：[1]华东理工大学洁净煤技术研究所,上海200237 [2]国家科技部高新司材料处,北京100862

出　　处：《燃料化学学报》2005年第2期129-133,共5页Journal of Fuel Chemistry and Technology

基　　金："十五"科技攻关项目(2001BA301B01);上海市科技发展基金项目(03QF14013)。~~

摘　　要：用Gibbs自由能最小化方法对粉煤气化过程进行了热力学平衡分析。对一混合煤种,在3. 0MPa和气化温度限制在1 200℃~1 450℃时,研究了氧-煤比、蒸气-煤比对气化炉出口气体组成、温度和有效气产率的影响,并由此确定了可行的操作域是氧-煤比545m3 /t^605m3 /t、蒸气-煤比为152. 64kg/t^313. 92kg/t及其对应的工艺指标。从操作域中选择有代表性的工艺条件为氧-煤比578m3 /t、蒸气-煤比为187kg/t,对应的气化炉出口温度1 358℃,CO+H2 干基体积分数为91. 5%,有效气产率为2. 123(CO+H2 )m3 /kg。同时,研究了碳转化率和热损失对气化工艺指标的影响,其影响是显著的。The entrained-flow pulverized coal gasification process was thermodynamically analyzed by Gibbs free energy minimization method. For a given coal, the effects of oxygen-coal ratio and steam-coal ratio on the crude syngas composition, gasification temperature and the yield of CO + H2 were studied under the operating pressure of 3.0 MPa and gasification temperature ranging from 1200°C to 1450°C. The thermodynamic analysis results of the reasonable operation ranges (545 m3/t to 605 m3/t coal for oxygen-coal ratio and 152.64 kg to 319.32 kg steam/t coal for steam-coal ratio) and the corresponding gasification performance (typically, CO + H2 91.5 v% (dry base), gasification temperature 1358°C and syngas yied of 2.123 CO + H2 m3/kg coal) are obtained. At the same time, the study of the effects of carbon conversion efficiency and heat lost on the gasification performance shows that the effects are remarkable.

关 键 词：气流床 Gibbs自由能 热力学平衡 粉煤气化 

分 类 号：TQ54[化学工程—煤化学工程]