炼油厂火炬气补充燃料气系统优化改造

Optimization revamping of make-up fuel gas system for refinery flare gas

介绍了某炼油厂火炬气回收和利用现状,分析了火炬气回收利用中存在的火炬气利用率不高问题。提出了炼油厂火炬气补充燃料气系统管网的工艺改造方案,给出了压缩机选型结果,并对火炬气出口管路阻力降和火炬气脱硫装置脱硫能力进行了核算,达到了炼油厂火炬气补充燃料气管网系统对火炬气压力降不小于0.7 MPa和硫化氢质量分数不大于100μg/g的要求。通过项目实施效果对比和经济效益分析,改造后每年可减少天然气用量约8 869 t,减少外供燃煤锅炉燃料气约12 320 t,每年可节省费用约2 329万元,相对于该项目总投资900万元,经济效益十分可观。

Recovery and utilization of refinery flare gas are introduced. The existing problems in flare system are analyzed,and the revamping design of make-up fuel gas system of refinery flare gas,control and selection of compressor are proposed. The pressure drop at the outlet pipeline of flare gas and capacity of flare gas desulfurization unit are calculated to meet the requirements that the pressure drop of flare gas caused by make-up fuel gas system for refinery flare gas is no greater than 0. 7 MPa and H2 S is no higher than 100 ppm.The project implementation comparison and economic analysis show that 8869 tons of natural gas are saved each year. 12 320 tons of fuel gas for supply to the boiler are reduced. The annual economic benefit is 23. 29 million Yuan RMB. The economic benefit is significant for a total investment of 9. 0 million Yuan RMB.