基于水煤浆预热煤气化的旋梯式螺旋折流板换热器的模拟和优化

Simulation and optimization of heat exchanger with ladder-type fold baffles based on coal water slurry preheating gasification

应用化工过程模拟和计算流体动力学模拟相结合的方法,进行了增设旋梯式螺旋折流板换热器的水煤浆预热煤气化系统的经济性分析,研究了换热器的结构参数(折弯角、折弯度、相对高度)对总收益和总费用的影响,并基于水煤浆预热煤气化系统的经济性分析完成了换热器的优化。结果显示,总收益随折弯角和折弯度的增大而减小,随相对高度的增大而增大;总费用随折弯角的增大而减小,随折弯度和相对高度的增大先增大后减小;以最大化净收益为目标优化换热器结构参数,当折弯角为30°、折弯度为0.60、相对高度为0.562时,净收益达到最大,相比原始结构增加了4.94%。

Combining computational fluid dynamics simulation and chemical process simulation,the economic analysis of coal water slurry preheating gasification system added with heat exchanger with ladder-type fold baffles was carried out.The study was made on the influences of the key structural parameters of heat exchanger(bend angle,bend degree and relative height)on total earning and cost,and the heat exchanger optimization was completed based on the economic analysis of coal water slurry preheating gasification system.The results showed that the total earning decreased with the increase of bend angle and bend degree,and increased with the increase of relative height.The total cost decreased with the increase of the bend angle,and increased first and then decreased with the increase of the bend degree and the relative height.The structural parameters of the heat exchanger were optimized to maximize the net earning,which was the highest when bend angle,bend degree and relative height were 30°,0.60 and 0.562 respectively,increased by 4.94%compared with the original structure.