催化汽油选择性加氢脱硫装置采用热分流程的探讨

Study on application of hot separator process flow in FCC gasoline selective hydrodesulfurization unit

介绍了催化汽油选择性加氢技术冷分和热分工艺流程,并探讨了两种流程采用PSA氢气和重整氢气作补充新氢时在设备热负荷、循环氢纯度、装置能耗及设备投资等方面的对比。结果表明,热分流程较之冷分流程,PSA氢气作补充新氢时,能耗降低约32.2 MJ/t,循环氢纯度降低1.76百分点,设备投资减少33万元;重整氢气作补充新氢时,能耗降低约21.3 MJ/t,循环氢纯度降低4.44百分点,循环氢纯度低于85%,不利于加氢脱硫催化剂的选择性脱硫性能,且总体上看没有正的效益;相比采用重整氢气和冷分流程,采用PSA氢气和热分流程能耗降低42.7 MJ/t,节能效果显著。

The cold separator process flow and hot separator process flow are introduced.The analysis and comparison of two process flows are discussed in respect of equipment thermal duty,purity of recycle hydrogen,energy consumption and equipment costs when the hydrogen from PSA and reformer is used as makeup hydrogen.The results show that the energy consumption of the hot separator process flow for PSA hydrogen is 32.2 MJ lower than that of the cold separator process flow,the purity of recycle hydrogen is decreased by1.54 unit,and capital investment of 330,000 Yuan（RMB）is saved.Whereas,when reformer hydrogen is used as make-up hydrogen,the energy consumption is lowered by about 21.3 MJ / t,the purity of recycle hydrogen is reduced by 3.92 unit and is lower than 85%,which is not favorable for maintaining the performance of HDS catalyst and offers no positive benefit for the unit.As compared with the cold separator process flow using reformer hydrogen,the energy saving of hot separator process using PSA hydrogen is 42.7 MJ / t and economic benefit from energy saving is significant.