热集成技术在常减压装置卜的应用

Application of Heat Integration Technology in Atmospheric and Vacuum Distillation Unit

茂名分公司炼油分部3号常减压装置由于换热终温较低(为255.4℃),应用热集成技术对工艺过程用能进行分析,提出了同步优化分馏塔和换热网络的方案,包括操作优化和改造优化两个方面。其中,操作优化是通过改变操作工况,最终达到提高换热终温、降低燃料消耗的目的。实施后,分馏塔实现零回流控制,原油各流股温差缩小,混合(火用)损减少,原油换热终温提高到262.4℃,节省能耗0.568kg标油/t,产生经济效益476.5万元/a。改造优化是通过改造换热设备以达到增加换热量、提高换热终温、节约能耗的目的。具体措施为交换换热器换7-3与换5-3AB的位置,回收常压塔顶冷凝负荷,用来加热电脱盐水,可使其注水温度由60℃提高到127℃,原油换热终温可提高4.1℃。

The Nu.3 atmuspheric and vacuum distillation unit of the Refining Department of SINOPEC Maoming Company had an excessively low final temperature for heat exchange.To resulve this problem,technicians al SINOPEC Maoming Company analyzed the energy efficiiency of the technical process of lhe unil using heat integration technology and proposed a plan to synchronously optimize the fractionating tower and the heat exchanger network.This plan consists of two components-operation optimization and technical optimization. The operalion optimization iv to change the operating conditions of the unit to raise fire final temperature of heat exchange and reduce fuel consumption.After Ihe operation optimization was eompleted,the fractionating lower realized zero-reflux control,the temperature differentials between crude slreams decreased,blending loss reduced and the final temperature of crude heat exchange rose to 262.4℃ .The amount of energy saved reached 0.568kg of oil equivalent per ton and the economic, benefits from the oplimizalion reached 4.765 million yuan per year.The technical optimization iv to change heal exchange equipment to raise the amount of heat exchanged and the final temperature of heat exchange and to reduce energy consumption.Technicians changed the position of heal exchanger 7-3 with heal exchanger 5-3AB and recycled the condensate load al the top of the atmospherie column to heal the electric desahing water.The injection lemperalure of the water couhl be raised to 127℃ from 60℃ and the final temperature of etude heal exchange could be raised by 4.1℃.