【摘要】 石化企业生产流程复杂,能量系统包括多种形式的能量转换、不同工艺和单元的能量利用,以及装置或者全厂范围的能量回收利用等。针对石化企业能量系统特点,按照能量演变规律及能量利用的本质,提出了分段递进式协同优化策略。首先进行工艺装置的用能优化,在此基础上进行装置间热联合考虑和换热网络优化等,接着展开罐区和辅助系统的用能优化,以及全厂低温热的综合回收利用,最后优化蒸汽动力系统,在全局范围内实现能量的综合优化利用。通过国内某大型石化企业全厂用能优化验证所提出优化方法的可行性和合理性,节能效果和经济效益明显,投资回收期约2年。更多还原

【Abstract】 Process flowsheet of petrochemical industry is very complex and energy system involves different energy conversion,energy utilization of all processes and units and energy recovery in total refinery complexes.According to the characteristic of energy system in refinery complexes and insight of energy utilization,this paper presents a sublevel decomposition and coordination optimization strategy for petrochemical energy system.Firstly,process units are improved for better energy utilization,and heat integration between them is developed based on process optimization.Secondly,energy utilization of inventory systems and other assistant systems are improved to reduce steam consumption.Thirdly,considering plane layout and energy source and sink distribution,low-temperature heat recovery-utilization systems are established to improve efficiency of energy utilization.Fourthly,the operations of steam power systems are optimized and some retrofits are proposed in the condition of steam and firedamp balance in total refinery complexes.Finally,a real industrial example for total site energy optimization is taken to demonstrate the performance of the presented method,and the capital pay-off time is about two years.更多还原