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.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
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)。~~
关键词
气流床
Gibbs自由能
热力学平衡
粉煤气化
entrained-flow pulverized coal gasification
Gibbs free energy minimization
thermodynamic equilibrium analysis
gasification performance
