本文对三种不同的丙烯压缩制冷流程进行了分析比较和模拟计算.在同样的冷剂冷量和规格的基础上,计算得出了带闪发式经济器的二级丙烯压缩制冷流程能耗最低、装置投资最省的结论.分析了补气压力对整个制冷系统性能和投资的影响,并获得了冷剂循环总量、补气量、压缩机各段功率、压缩后冷凝器热负荷及制冷系统的工作性能参数COP(Coefficient of Performance)等随补气压力变化的曲线图.基于本文中所采用的带闪发式经济器的二级丙烯压缩制冷流程,最佳补气压力为0.65MPa(G).在该补气压力下,热力学效率最高、能耗最低,同时固定投资最省,经济效益最佳.
Simulation and Optimization of Propylene Refrigeration System in Low Temperature Ethylene Tank Area
This paper analyzes,compares and simulates three different propylene compression refrigeration processes.On the basis of the same refrigerant cooling capacity and specifications,it is calculated that the two-stage propylene compression refrigeration process with a flash economizer has the lowest energy consumption and the most economical plant investment.The impact of make-up air pressure on the performance and investment of the entire refrigeration system is analyzed,and the curve graphs of the total refrigerant cycle,make-up air amount,compressor power in each section,condenser heat load after condensation,and the working performance parameter COP(Coefficient of Performance)of the refrigeration system with changes in make-up air pressure are obtained.Based on the two-stage propylene compression refrigeration process with a flash economizer adopted in this paper,the optimal make-up air pressure is 0.65MPag.Under this make-up air pressure,the thermodynamic efficiency is the highest,the energy consumption is the lowest,the fixed investment is the least,and the economic benefit is the best
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