摘要
洛阳石化公司140×104t/a延迟焦化装置存在多种携带低温热的介质,为了有效回收利用这部分能量,进行了一系列的流程改造和技术攻关。本文探讨了焦化装置低温热回收的可行性,介绍了各种低温热回收措施的工艺流程和实施效果。其中：汽油、柴油、蜡油装置实现了与下游装置的热联合;加热炉空气预热器在原来基础上新增539根热管,进一步回收烟气余热,降低了排烟温度;凝结水回收系统实现了凝结水三种途径的回收利用;除盐水代替循环水回收分馏塔顶循环油、汽油和柴油的低温热。改造后,成功实现了稳定汽油、柴油、蜡油、加热炉烟气、凝结水、分馏塔顶循环油等低温热的回收利用。这些措施的投用,可降低装置能耗6~8kg标油/t,每年可创造经济效益3000余万元。对目前未能回收的低温热提出了进一步优化的措施和建议,对同类装置的低温热回收利用具有一定的指导作用。
Sinopec Luoyang Company ′ s 140 × 104 t / a delayed coking unit has multiple media that carry low-temperature heat.In order to effectively recover this heat,technicians conducted a range of process modifications and technical research.This article discusses the feasibility of recovering low-temperature heat in coking units and describes the processes and effectiveness of various low-temperature heat recovering measures.In its technical upgrade,Sinopec Luoyang Company achieved a heat integration between its gasoline,diesel fuel and wax oil units and downstream units.In addition,an additional 539 heat pipes were added for the air pre-heater of the heating furnace to further recover residual heat in flue gas,thus reducing exhaust gas temperature.Condensed water was recycled in three ways through the condensed water recovering system and circulat-ing water was replaced by demineralized water to recover the low-temperature heat in the circulating oil at the top of the fractionating column,gasoline and diesel fuel.After this upgrade,low-temperature heat in gasoline,diesel fuel,wax oil,heating furnace flue gas,condensed water and circulating oil at the top of the fractionating column was steadily recovered for reuse.These measures could reduce the delayed coking unit ′ s energy consumption by 6-8kg of oil equivalent per ton of feedstock processed and annual economic benefits from them could exceed 30 million yuan.This article proposes further measures and suggestions on the recov-ery of low-temperature heat that cannot be recovered for the moment.These measures could guide the recov-ery of low-temperature heat in similar units.
出处
《中外能源》
CAS
2015年第3期94-98,共5页
Sino-Global Energy
关键词
延迟焦化
低温热
回收利用
技术改造
热联合
delayed coking
low-temperature heat
recovery for reuse
technical upgrade
heat integration
