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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。
Syngas heat exchangers are an important part of an integrated gasification combined cycle (IGCC) system. Gasifiers equipped with gas coolers can recycle the physical sensible heat of the syngas and increase the IGCC system efficiency. In this paper, the porous media model was used to simulate the heat transfer between water and high pressure syngas in the gas cooler, and the porosity, the distribution resistance and the distribution heat source were coupled into FLUENT through user-defined functions. And compared the different baffle arrangement on the heat transfer. The results show that the porous media model can well simulate the flow and heat transfer of the shell gas in the gas cooler. Appropriately reducing the number of the baffles can effectively reduce the pressure drop of the shell-side fluid and has little effect on the heat transfer.