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利用虚拟温度法(流股有效温位)对国内某乙烯装置冷箱系统进行用能诊断分析,找出过程系统的用能“瓶颈”,并针对低温过程传热温差较小以及冷公用工程采用中间公用工程的特点,提出了低温过程多流股换热器网络的综合方法;该方法能够有效的利用冷热流股的有效温位,使冷公用工程的操作费用达到最小,得到合理的换热网络,并且在优化流股传热温差贡献值过程中,考虑了各流股温度、传热膜系数和换热器材质的影响,因此可以用于不同材质、不同传热膜系数低温换热网络的设计和优化;将该方法应用于国内某乙烯装置冷箱系统的综合中,与现场用能情况相比,冷公用工程用量降低了44.5%;结果表明该方法在工程中是可行的。
Using the virtual temperature method (the effective temperature of the stream), we can diagnose and analyze the domestic cold box system of ethylene plant to find out the “bottleneck” of energy consumption of the process system. In view of the small heat transfer temperature difference in the low temperature process and the cold public project The characteristics of the middle utility project, put forward the synthesis method of the multi-flow heat exchanger network in the low temperature process; the method can effectively utilize the effective temperature of the cold and hot flow stocks to minimize the operation cost of the cold utility project and obtain a reasonable exchange Heat network, and to optimize the contribution of heat transfer temperature difference in the process, taking into account the temperature of the stream, the coefficient of heat transfer film and heat exchanger material effects, it can be used for different materials, different heat transfer coefficient of low temperature heat transfer Network design and optimization. The method is applied to the synthesis of a domestic cold box system of ethylene plant. Compared with the case of on-site energy use, the amount of cold public utility project is reduced by 44.5%. The results show that this method is feasible in the project.