炼油厂余热发电方案比较与效益分析

Comparison and analysis of refinery cogeneration schemes and benefits

介绍陕西延长石油(集团)有限责任公司榆林炼油厂四种余热发电工程实例的余热回收途径、技术特点、应用情况、节电效益及投资收益。对过去惯于燃烧放空的火炬气,先脱硫处理后经2台75 t/h,1台35 t/h蒸汽锅炉燃烧产汽,再通过2台10 MW,1台3 MW+6 MW余热发电站分别回收全厂中、低压蒸汽中的余热;通过5.35 MW"三机组"回收0.6 Mt/a催化裂化装置反应再生系统所产生高温烟气中的余热;通过31.5 MW"四机组"分别回收1.8 Mt/a催化裂化装置反应再生系统所产生高温烟气和中压蒸汽中的余热,从而形成"一条龙"回收炼油装置所产的高温烟气、蒸汽和火炬气的余热发电技术方案,可满足全厂生产、生活用电,每年节约电费约1.77×108RMB$。

The waste heat recovery process,technical features,commercial applications,energy savings and return of capital investment of four power generation projects using recovered waste heat of Yulin Refinery of Shaanxi Yanchang Petroleum （Group） Co.,Ltd.are introduced.The flare flue gas which was vented after combustion in the past years is recovered and desulfurized,and is then sent to two 2 × 75 t/h steam boilers and one 35 t/h steam boiler for steam generation.The steam is fed to two 10 MW waste heat power stations and one 3 MW ＋ 6 MW power station so as to recover the waste heat from medium-pressure and low-pressure steams of the refinery; The ＂3-component flue gas expander train＂ with 5.35 MW main air blower is operated to recover the waste heat from regenerator＇ s high-temperature flue gas of a 600,000 TPY FCCU ; A ＂4-component flue gas expander train＂ with 31.5 MW main air blower is installed to recover the waste heat from the high-temperature flue gas from FCCU regenerator and from medium-pressure steam.A complete waster heat recovery process has been developed and utilized to recover the waste heat from HT flue gas,steam and flare gas for power generation.The annual saving from electricity is about 177 million Yuan （RMB）.