热联合技术在炼化装置上的应用

Heat Integration Tech Used in Refining and Chemical Units

热联合是一项重要的、发展成熟的节能技术措施,通过能量的优化利用,达到节能降耗的目的,目前已广泛应用于生产装置。文章主要阐述了热联合技术在炼化装置上的应用,总结了实施几年来的效果,重点分析了热联合技术在实施过程中出现的问题,在充分考虑热联合应用是在一个大系统内进行的"高热高用,低热低用"匹配,以及热联合对下游装置平稳运行的影响后,提出了更换部分设备、完善管线保温、增上低温热发电设施、优化换热网络等措施,其中更新航煤加氢装置原料罐,完善航煤管线保温措施实施后,降低了航煤加氢装置燃料消耗约0.3 t/h,取得了明显的经济效益。

Heat integration is an important and mature technology for energy saving,which is based on energy optimization and has widespread use in refining and chemical units.The paper illustrates the development of heat integration used in refining and chemical units,and summarizes the effects of heat integration in recent years,with focus on analysis of some issues existed in practical use.Considering that heat integration is about matching heat source temperatures and cascade utilization in a big system,and may have impact on stable operation of the downstream facilities,the paper proposes some measures such as replacing some old equipment,improving pipelines insulation,adding cryogenerator,and optimizing heat-exchanger network.Of them,replacing with new kerosene hydrofining feed tank and improving kerosene pipeline insulation have helped reduce fuel consumption in kerosene hydrofining unit by about 0.3t/h.The results show that the better energy-saving and economic benefits are gained.