天津石化炼油节能优化措施及潜力分析

Sinopec Tianjin Company′s Optimized Energy Saving Measures and Energy Saving Potential Analysis

天津石化1000×104t/a炼油工程由3号常减压、2号加氢裂化、重整抽提、2号延迟焦化、2号柴油加氢、蜡油加氢、航煤加氢、2号硫磺回收等装置及储运系统和公用工程系统组成。炼油新区在设计中进行了能量综合优化,采取了一系列节能措施。在流程设置上,加氢装置采用热高压分离器流程和循环氢脱硫流程,一些装置采用热直供料,2号柴油加氢装置与航煤加氢装置实现了热联合。在低温热利用方面,设立高温热媒水系统,回收新区加氢装置低温热,用来加热热电部除盐水。设立低温热媒水系统,回收2号延迟焦化装置的低温热,冬季为新区装置采暖伴热提供热源,夏季为溴化锂机组供热。炼油新区各装置实施了节能优化,主要项目有:重整抽提装置蒸汽凝结水热能利用,2号延迟焦化和重整抽提装置部分蒸汽伴热改为水伴热,2号延迟焦化装置热出料流程优化。针对炼油新区在低压蒸汽平衡、中压蒸汽管网运行方面存在的问题,提出优化措施。

Sinopec Tianjin Company′s 1000×104t/a refining project consists of the atmospheric and vacuum distillation unit no.3,the hydrocracking unit no.2,a reforming and extraction unit,the delayed coking unit no.2,the diesel fuel hydrogenation unit no.2,a wax oil hydrogenation unit,a jet fuel hydrogenation unit,the sulfur recovering unit no.2,the storage and transportation system,and public utilities.In design,a series of measures were taken to optimize the energy saving effect for the oil refining area.In workflow settings,the hydrogenation units adopted a hot high-pressure separator process and circulating hydrogen desulfurization process.Some units use the hot direct feeding technique.The diesel fuel hydrogenation unit no.2 and the jet fuel hydrogenation unit achieved heat integration.To utilize low-temperature heat,the company set up a high-temperature heating medium water system to recover low-temperature heat from hydrogenaton units in the refining area.The heat recovered is used to heat demineralized water in the thermoelectricity section.A low-temperature heating medium water system was set up to recover low-temperature heat from the delayed coking unit no.2to provide tracing heat for various units in the refining area in winter and supply heat to lithium bromide sets in summer.The main measures to optimize energy saving for the units in the refining area included ：Recovering heat from the steam condensate in the reforming extraction unit,changing steam-based heat tracing to water-based heat tracing for parts of the delayed coking unit no.2 and the reforming extraction unit,and optimizing the hot discharge process for the delayed coking unit no.2.This article proposes some measures to optimize the problems regarding low-pressure steam equilibrium and the operation of the medium-pressure steam pipe system in the refining area.