煤气化过程的热力学分析  

Thermodynamic analysis of the coal gasification process

作　　者：刘广建[1] 李政[1] 黄河[1] 倪维斗[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第5期844-847,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金重大项目(90210032);国家"九七三"重点基础研究项目(2005CB221207)

摘　　要：为研究气化过程损失的原因和损分布,基于不可逆过程熵平衡方程将气化过程分解为反应物混合、化学反应、生成物和反应物之间热交换以及混合等子过程,分析不同操作条件下碳气化反应的能量损失。从气化过程理论做功能力的角度,考察气化过程中放热和吸热反应对过程损失的影响。由于耦合了吸热和放热反应,当氧碳摩尔比为0.35、水碳摩尔比为0.31时,1 kg碳气化过程损失存在局部极小值4.521M J,对应最佳气化反应温度为1 200K。The entropy conservation equation for irreversible processes was used to analyze the exergy destruction and the reasons for exergy destruction during solid carbon gasification. The process was divided into the reactant mixing step, chemical reactions, heat transfer, and product mixing sub-processes. Energy losses in the gasification process were analyzed for various operating conditions, with the influence of the various exothermic and endothermic reactions on the exergy losses studied based on the gasification process theoretical working ability. The results show that when coupled with the exothermic and endothermic reactions, for 1 kg solid carbon with a molar ratio of oxygen to carbon of 0. 35 and a molar ratio of steam to carbon of 0.31, the local minimum exergy loss is 4. 521 MJ, with an optimum gasification temperature of 1 200 K.

关 键 词：热力学 气化 [火用]损失 

分 类 号：TK01[动力工程及工程热物理] TQ21[化学工程—有机化工]