选择性加氢技术生产超低硫催化汽油的方案比较

Comparison of process schemes of selective hydrodesulfurization for production of ultra-low sulfur gasoline

以某炼油厂拟新建0.5 Mt/a催化裂化汽油加氢装置为例,介绍采用选择性加氢脱硫技术满足生产质量分数小于10μg/g超低硫汽油的一级加氢脱硫和两级加氢脱硫工艺方案,对比两种方案的工艺流程、操作条件、产品性质、装置能耗及设备投资。结果表明:两级加氢脱硫工艺方案反应缓和,化学氢耗低,年节省新氢约808 t,液体收率提高0.22单位,年增加效益约1 500×104RMB$,且RON损失低,可减少1单位,但由于多增加了一级加氢脱硫步骤,使工艺流程复杂,设备增多,增加设备投资约900×104RMB$,装置能耗增加约20.3%。综合比较后仍建议选用两级加氢脱硫方案。

Through a case study of a 500,000 TPY FCC gasoline hydrodesulfurization unit of a refinery,the selection of 1-stage HDS process or 2-stage HDS process to produce ultra-low sulfur gasoline to meet 10 μg/g sulfur specifications is introduced.The process flow,operating conditions,product specifications,unitenergy consumption and costs of two processes are compared.The results show that,2-stage HDS process had mild reaction conditions and lower chemical hydrogen consumption,and about 808 tons makeup hydrogen is saved per year.The liquid yield is increased by 0.22％,and annual revenue can be increased by 15 million Yuan （RMB）.The octane loss is low and is only reduced by 1.0.However,the process flow is long and complex due to addition of 1 stage HDS,the equipment cost is increased by about 9.0 million Yuan （RMB） and the unit energy consumption is raised by 20.3％.It is recommended to select 2-stage HDS process for the unit.