CO_2作煤粉输送载气对GSP气化过程影响的模拟研究  

Comparative simulation study of the effect of pulverized coal conveying carrier gas on GSP gasification process:CO_2 vs.N_2

作　　者：刘金昌[1] 张玉柱[2] 党钾涛[1] 曹俊雅[1] 解强[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]神华宁煤集团煤炭化学工业分公司,宁夏银川750000

出　　处：《中国矿业大学学报》2014年第5期905-909,共5页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2014CB238905);中央高校基本科研业务费资助项目(2009KH10)

摘　　要：基于Gibbs自由能最小化原理,将GSP气化过程分解为热解单元和气化单元建模,使用灵敏度工具进行分析,探究CO2和N2分别作为煤粉输送载气时对气化温度、CO和H2以及有效气(CO+H2)产率的影响.结果表明:采用Aspen Plus软件建立的气化模型模拟计算结果与生产数据吻合;与N2相比,以CO2为煤粉输送载气时,气化温度降低约70℃,CO摩尔分数提高约4%、而H2摩尔分数降低约1%,但有效气摩尔分数提高约3%.当CO2流量从12 000Nm3/h升至15 000Nm3/h,气化温度降低约11℃,CO摩尔分数提高约0.15%,H2摩尔分数降低约0.85%,有效气摩尔分数降低约0.7%;当N2流量从12 000Nm3/h升至15 000Nm3/h,气化温度降低约6℃,CO摩尔分数降低约0.33%,H2摩尔分数提高约0.14%,有效气摩尔分数降低约0.19%.CO2作为煤粉输送载气在可减少CO2排放量的同时能够提高气化炉的生产能力和经济效益.Process model of GSP gasifier was developed in the light of principles of minimizing Gibbs free energy with the aid of Aspen Plus, and the model was checked by actual gasification process data. The effects of pulverized coal conveying carrier gases, CO2 and N2, on gasifica- tion temperature and yields of H2, CO and total syngas were investigated by means of sensitivi- ty analysis. The results show that the simulated process data of GSP gasification are in good fit with actual production data. Substitute CO2 for Ne as carrier gas will result in decrease of gasi- fication temperature by 70 ℃, increase of CO mole fraction by 4 %, reduction of H2 mole frac- tion by 1%, and consequently a total syngas will increase by 3%. As flow rate of COs is en- hanced from 12 000 Nm3/h to 15 000 Nma/h, the gasification temperature lowers by 11 ℃, mole fraction of CO increases by 0.15%, mole fraction of H2 decreases by 0.85%, and total syngas reduces by 0. 7%. Meanwhile, when flow rate of Nz is elevated from 12 000 Nma/h to15 000 Nm3/h, the gasification temperature lowers by 6 ℃, mole fraction of CO decreases by 0.33%, mole fraction of H2 increases by 0.14%, and total syngas decreases by 0.19%. As a whole, the emission of CO2 could be reduced and the production capability of gasifier would be enhanced in the case of CO2 as carrier gas.

关 键 词：GSP气化炉 煤粉输送载气 CO2 ASPEN PLUS 灵敏度分析 

分 类 号：TQ546[化学工程—煤化学工程]