摘要
合成气换热器是整体煤气化联合循环(integratedgasification combined cycle,IGCC)系统的重要组成部分,装有煤气冷却器的气化炉可对合成气的物理显热进行回收利用,提高IGCC系统效率。该文利用多孔介质模型对燃气冷却器中水与高压合成气之间的换热进行了模拟研究,将孔隙率、分布阻力、分布热源通过用户自定义函数耦合进FLUENT进行计算。并对比了不同的折流板布置方式对换热的影响。结果显示多孔介质模型可以很好地模拟燃气冷却器壳程流体的流动和换热;适当减少折流板数目可以有效降低壳程流体的压力降,并且对换热的影响不大。
The syngas heat exchanger is an important equipment in an integrated gasification combined cycle（IGCC）.It can reclaim the physical heat and increase the efficiency when there is a syngas cooler in an IGCC.This work investigated the flow and the heat transfer characteristics between the water and the syngas in the syngas cooler using the porous medium model.The porosity rate,the distribution of the resistance and the distribution of the heat source were introduced to FLUENT by coupling the user defined function.The effect of the arrangement of the baffles on the heat transfer was studied.The results show that the porous medium model is valid to simulate the flow and heat transfer for the shell side fluid in the syngas cooler.Moreover,the pressure drop decreases as the number of the baffles reduces in a certain range while it has little influence on heat transfer.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第32期31-38,共8页
Proceedings of the CSEE
基金
国家863高技术基金项目(2007AA05Z247)
上海高校青年教师培养资助计划~~
关键词
高压
合成气
换热器
整体煤气化联合循环
模拟
换热
high pressure
syngas
heat exchangers
integrated gasification combined cycle（IGCC）
simulation
heat exchange
