炼厂低温热利用的实践和策略

从多层次探讨了炼厂低温热利用方案。首先从区域优化角度提供以催化裂化顶循环油和轻柴油作为接力热源，建立催化裂化和气体分馏MTBE装置上下游多热源、多热阱大系统的能量利用方案，能节省10t／h的1．0MPa蒸汽。其次从炼油厂系统整合优化角度探讨除盐水在除氧环节以及除氧水在升温环节低温热利用的途径，通过技术改进和系统低温热利用相结合，探讨芳烃精馏塔实现回收低温热和消除装置瓶颈的可行性，提出利用区域除盐水集中升温除氧以及区域除氧水先集中升温再进汽包产汽的芳烃脱庚烷塔低温热利用方案，不仅能回收67％的低温热，产生的1．4MPa低压蒸汽（10t／h）还可代替连续重整装置脱已烷塔重沸器的中压蒸汽。通过深入分析后提出了对歧化、异构化和连续重整等芳烃装置进行类热高分改造方案，并对回收低温热的潜力进行科学评估。对目前对二甲苯（PX）装置低温热回收中最难环节-抽出液和抽余液塔塔顶油气低温热利用的可能性进行分析与评估，提出了建设性的方案。

Practice and strategy for recovering low-temperature heat in refinery

The utilization of low-temperature heat in the refinery is studied.10 t/h of steam can be saved by establishment of multiple-heat-source and multiple-heat-trap heat utilization system at both upstream and downstream of FCCU,LPG fractionator and MTBE unit based upon area optimization and heat sources of FCC main fractionator top pumparound and light cycle oil.In addition,the low-temperature heat utilization in deaeration of desalted water and temperature elevation of deaerated water is explored on the basis ...