發(fā)布時(shí)間：2018-12-27 11:47

【摘要】：長慶石化催化液化氣脫硫裝置采用醇胺法脫除H2S,傳統(tǒng)堿洗法脫除硫醇。隨著催化原料性質(zhì)變化和加工量的增大,液化氣脫硫裝置日益暴露出一些問題:胺液夾帶影響脫除H2S效果;液化氣脫硫醇部分由于兩抽提塔的規(guī)格不同,進(jìn)塔流量的差異導(dǎo)致液化氣堿液攜帶,影響氣分裝置設(shè)備正常運(yùn)行;預(yù)堿洗單元和脫硫醇抽提塔產(chǎn)生大量堿渣,不利于環(huán)保;經(jīng)預(yù)堿洗和堿液抽提后液化氣中H2S含量較低,故精脫硫罐脫除H2S的作用沒有得到發(fā)揮。根據(jù)長慶石化催化液化氣原料總硫含量低的特點(diǎn),建議催化液化氣堿洗脫硫醇單元改造為固定床無堿脫硫醇工藝,對(duì)裝置改造投資進(jìn)行了估算。改造后,簡化了工藝流程,實(shí)現(xiàn)了全流程連續(xù)生產(chǎn),全過程無"三廢"排放問題,產(chǎn)品質(zhì)量合格。減少濃堿消耗大約220t/a,廢堿渣排放大約300t/a,消除了換堿過程中的安全隱患,降低了環(huán)保壓力。
[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.
【作者單位】： 中國石油長慶石化公司;
【分類號(hào)】：TE624.55

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本文編號(hào)：2393016