烟煤煤焦等温CO_2气化动力学模型研究  

Kinetic Model Study on Isothermal Gasification of Bituminous Coal Char by CO_2

作　　者：韩亮[1] 陈鸿伟[2] 高松[2] 吴亮[2] 赵振虎[2] 

机构地区：[1]中南电力设计院,湖北武汉430071 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《锅炉技术》2012年第4期67-71,共5页Boiler Technology

摘　　要：在建立的化学反应动力学控制实验条件下利用自建固定床实验台研究了烟煤煤焦等温CO2气化反应特性。采用均相模型、未反应收缩核模型和修正体积模型计算得到气化反应活化能分别为147.7kJ/mol、102.9kJ/mol和155.5kJ/mol。利用等转化率法避开反应机理函数的选择,计算得到反应活化能为144.1～166.0kJ/mol。通过比对不同模型相关系数大小以及与等转化率法计算所得活化能范围符合程度相结合的方法,确定均相模型和修正体积模型为最佳动力学模型;根据修正体积模型中经验常数b≈1,可认为修正体积模型与均相模型为同一模型。因此确定烟煤煤焦CO2气化反应最佳动力学模型为均相反应模型。The kinetics of bituminous coal char isothermal gasification by carbon dioxide was studied under chemical controlled regime in a self-built fixed bed reactor. Activation energy of 147.7, 102.9 and 155.5 kJ/mol were calculated by homogeneous model （HM）, unreacted shrinking core model （SCM） and modified volumetric model （MVM） separately. Activation energy of 144.1-166.0 kJ/mol was got through isoconversional method which could avoid the choosing of mechanism functions. Via the comparison of related coefficient among different models and the activation energy got from both methods, HM and MVM were determined to be the most probable model. MVM and HM could be considered to be the same model because empirical constant b approximate to 1 in MVM. So HM was determined to be the most probable kinetic model for the CO2 gasification of bituminous coal char.

关 键 词：等温CO2气化 动力学模型 等转化率法 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]