某合成氨厂氨合成工段换热网络的模拟与优化

Simulation and optimization of heat exchanger network for ammonia synthesizing workshop section

降低化工过程系统用能的手段之一就是应用系统能量综合技术,对整个系统进行用能的分析及调优,确定整个换热网络最佳的流程结构,在满足过程工艺物流初、终温要求的基础上,使其具有最少的设备投资费用和操作费用。基于夹点设计为主要方法,以年平均费用最小为目标,利用化工模拟软件SIMSCI HEXTRAN对某大型合成氨厂氨合成工段进行模拟,发现传热温差较大,用能状况有不尽合理之处,提出改善建议,并给出优化结果。

One of the main methods to decrease the energy consumption of the chemical process is to integrate processes into one to make analysis and optimization of the whole processes.The best structure of exchanger networks of the whole process could be obtained which meet the need of temperatures for operation with the least cost spent.The synthesizing workshop section of an ammonia plant was simulated with the chemical process simulative software SIMSCI HEXTRAN,during which the pinch technology was used.The temperature difference of heat transfer in the network was found to be too high.And the energy consumed was somewhat unreasonable,in view of which some advice for improvement was put forward.