常减压蒸馏装置减压塔顶含硫不凝气的喷射增压脱硫技术

An ejection pressure-boosting desulfurization process for low-pressure vacuum overhead gas containing H_2S

介绍了一种应用于减压塔顶等低压富含硫化氢气体的增压脱硫工艺技术。该技术直接采用液体脱硫剂为驱动介质,通过液体喷射方式将减压塔顶低压富含硫化氢气体(或其它低压气体)增压,经与一定浓度的液体脱硫剂充分混合,气体中的硫化氢则与脱硫剂完全反应,从而实现包括减顶气在内的低压含硫气体的增压及高效深度脱除硫化氢气体的目的。通过大型工业装置应用表明,该技术可在深度脱除硫化氢的同时有效改善低压气体的压力使用条件,为加热炉提供环保型气体燃料,有效降低加热炉烟气中二氧化硫含量,工业应用表明可使减顶燃料气硫质量分数小于0.25%,在减压炉用燃料油含硫量不大于1%时,排放烟气的SO2质量浓度可不大于850 mg/m3,满足排放要求。与传统的采用压缩机将低压气体增压后进行塔式低压吸收脱硫工艺相比,减少了压缩机投资和维护费用,具有工艺流程简单、占地小、节省投资、容易操作和维护及增压和脱硫效率高的优点。

An ejection pressure-boosting desulfurization process for low-pressure vacuum owerhead gas containing H2S is introduced. In this process, the liquid desulfurization agent is directly applied as a driving medium. The low-pressure vacuum overhead gas rich in H2S （or other low-pressure gas） is pressure boosted by liquid ejectiun and fully mixed with liquid desulfurization agent of specified concentration for the reaclion of HzS in the gas with desulfufization agent to remove H2S al a high efficiency and to meet the environmental pro- tection requirement. The commercial application in a large process unit shows that this process can deeply re- move H2S, effectively improve the pressure utilization conditions of low-pressure gas and provide environmen- tally friendly fuel fur furnace to effectively reduce the SO., in furnace flue gas emission. As compared with con- ventional process in which the low-pressure gas is pressure boosted by compressor and sent to low-pressure absorber for desulfurizatinn, this process has saved the capital investment and operation cost of compressor and is simple in process, small in plot area requirement, saved in investment, easy in operation and maintenance and high in pressure boosting and desulfurization efficiency.