炼油装置问热联合可行性分析及优化建议

Feasibility analysis and optimization suggestions of heat integration between refining units

为进一步挖掘炼油装置节能潜力,降低能量消耗,利用热联合原理对部分装置用能进行分析,发现常压原油换热终温过低、焦化蜡油出装置先冷却下游再升温、用蒸汽进行工艺伴热等问题,可进行常减压原油与凝结水换热、催化与焦化装置热进料和部分装置改用热媒水伴热3项热联合改造。初步估算改造实施后可以提高原油换热终温10℃、节约循环水25t/h、伴热蒸汽节约15t/h,累计降低全厂能耗(标油)1kg/t左右,不但降低了能耗和运行成本,还取得较好的经济效益。

In order to further tap the energy-saving potential of oil refining unit and reduce the energy-consumption,the energy-using of some units has been analyzed according to the heat integration principle in this paper. Then three problems are founded: the final heat-exchange temperature of the crude oil after atmospheric distillation is too low, the coker gas oil is cooled when comes out of the unit and then heated in the downstream and the steam is used to do heat tracing. The above problems can be respectively solved by three heat integration transformations: the crude oil after atmospheric and vacuum distillation can exchange heat with condensation water, hot feed the catalytic and coking units and use hot water to do heat tracing in some of units. In the preliminary estimation, these transformations can raise 10 ℃ of crude oil' s final heat-exchange temperature,save 25 t circulating water per hour, save 15 t tracing steam per hour and cumulatively reduce(standard oil) 1 kg/t of the whole plant' s energy-consumption. By doing so, energy-consumption and operating cost can be reduced and better economic benefits can be achieved.