催化液化气脱硫技术现状及改造建议
发布时间：2018-12-27 11:47
【摘要】：长庆石化催化液化气脱硫装置采用醇胺法脱除H2S,传统碱洗法脱除硫醇。随着催化原料性质变化和加工量的增大,液化气脱硫装置日益暴露出一些问题:胺液夹带影响脱除H2S效果;液化气脱硫醇部分由于两抽提塔的规格不同,进塔流量的差异导致液化气碱液携带,影响气分装置设备正常运行;预碱洗单元和脱硫醇抽提塔产生大量碱渣,不利于环保;经预碱洗和碱液抽提后液化气中H2S含量较低,故精脱硫罐脱除H2S的作用没有得到发挥。根据长庆石化催化液化气原料总硫含量低的特点,建议催化液化气碱洗脱硫醇单元改造为固定床无碱脱硫醇工艺,对装置改造投资进行了估算。改造后,简化了工艺流程,实现了全流程连续生产,全过程无"三废"排放问题,产品质量合格。减少浓碱消耗大约220t/a,废碱渣排放大约300t/a,消除了换碱过程中的安全隐患,降低了环保压力。
[Abstract]:H _ 2 S was removed by alcohol amine method and mercaptan was removed by traditional alkali washing method in the catalytic LPG desulfurization unit of Changqing Petrochemical Company. With the change of catalytic raw material and the increase of processing quantity, some problems have been exposed in the LPG desulfurization device: the entrainment of amine liquid affects the removal effect of H _ 2S; Partly due to the different specifications of the two extraction towers, the difference in the flow rate of the two extraction towers leads to the carrier of the liquefied gas lye, which affects the normal operation of the equipment of the gas separation unit, and produces a large amount of alkali residue in the pre-alkali washing unit and the extraction tower of the removal of mercaptan, which is not conducive to environmental protection. After pre-alkali washing and lye extraction, the content of H _ 2S in LPG is low, so the effect of removing H _ 2S in refined desulfurization tank has not been brought into full play. According to the characteristics of low sulfur content in the raw materials of catalytic LPG in Changqing Petrochemical Company, it is suggested that the unit of catalytic LPG alkali-washing and removing mercaptan should be transformed into a fixed-bed alkali-free desulphurization process, and the investment in the revamping of the plant is estimated. After revamping, the technological process is simplified, the whole process is continuously produced, and the product quality is qualified without the problem of "three wastes" emission in the whole process. Reducing the consumption of concentrated alkali by about 220 t / a and the discharge of waste alkali residue by about 300 t / a eliminates the safety risks in the process of alkali exchange and reduces the pressure on environmental protection.
【作者单位】： 中国石油长庆石化公司;
【分类号】：TE624.55
[Abstract]:H _ 2 S was removed by alcohol amine method and mercaptan was removed by traditional alkali washing method in the catalytic LPG desulfurization unit of Changqing Petrochemical Company. With the change of catalytic raw material and the increase of processing quantity, some problems have been exposed in the LPG desulfurization device: the entrainment of amine liquid affects the removal effect of H _ 2S; Partly due to the different specifications of the two extraction towers, the difference in the flow rate of the two extraction towers leads to the carrier of the liquefied gas lye, which affects the normal operation of the equipment of the gas separation unit, and produces a large amount of alkali residue in the pre-alkali washing unit and the extraction tower of the removal of mercaptan, which is not conducive to environmental protection. After pre-alkali washing and lye extraction, the content of H _ 2S in LPG is low, so the effect of removing H _ 2S in refined desulfurization tank has not been brought into full play. According to the characteristics of low sulfur content in the raw materials of catalytic LPG in Changqing Petrochemical Company, it is suggested that the unit of catalytic LPG alkali-washing and removing mercaptan should be transformed into a fixed-bed alkali-free desulphurization process, and the investment in the revamping of the plant is estimated. After revamping, the technological process is simplified, the whole process is continuously produced, and the product quality is qualified without the problem of "three wastes" emission in the whole process. Reducing the consumption of concentrated alkali by about 220 t / a and the discharge of waste alkali residue by about 300 t / a eliminates the safety risks in the process of alkali exchange and reduces the pressure on environmental protection.
【作者单位】： 中国石油长庆石化公司;
【分类号】：TE624.55
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