天然气净化厂开停工尾气吸收耦合吸附法脱硫研究  

Study on tail gas desulfurization by absorption-adsorption coupling method during start-up and shutdown in natural gas purification plant

作　　者：彭维茂 蓝家文 宋磊 杨志鹏 周维权 罗永辉 岳海荣[2] PENG Weimao;LAN Jiawen;SONG Lei;YANG Zhipeng;ZHOU Weiquan;LUO Yonghui;YUE Hairong(Southwest Oil&Gas Field CDB Operating Company,Dazhou,Sichuan,China;School of Chemical Engineering,Sichuan University,Chengdu,Sichuan,China)

机构地区：[1]西南油气田川东北作业分公司 [2]四川大学化学工程学院

出　　处：《石油与天然气化工》2024年第6期1-6,共6页Chemical engineering of oil & gas

基　　金：四川省自然科学基金“富氧空位NH_(3)-SCR催化剂低温深度脱硝研究”(2024NSFSC1152)。

摘　　要：目的在天然气净化装置开停工过程中,尾气不经过SCOT尾气处理装置直接排放,且具有时间长、排放量高、组分复杂和组成波动大等特点,在此期间可能会累积大量二氧化硫(SO_(2))。为此,需要采取措施实现开停工过程中的SO_(2)减排。方法针对尾气中的SO_(2)和硫化氢(H_(2)S),提出了尾气吸收耦合吸附法脱硫工艺,并对碱液吸收SO_(2)和可再生吸附剂吸附H_(2)S进行了研究。结果碱液吸收工艺可以保证SO_(2)几乎被完全吸收,且基本上不吸收H_(2)S和CO_(2),避免了碱液的过度消耗,同时,SO_(2)被充分吸收,可减少对后续吸附剂的影响。13X分子筛具有较好的吸附H_(2)S效果和再生效果,可以循环吸附,再生后的H_(2)S也可以在装置重新开工且达到稳定运行后循环使用。结论采用碱洗脱SO_(2)耦合吸附脱H_(2)S尾气处理工艺可保证天然气净化厂在开停工过程中SO_(2)排放量大幅减少,且工艺简单,操作空间大。Objective During the start-up and shutdown processes of the natural gas purification unit,the tail gas is directly discharged without the SCOT tail gas treatment unit,and it has the characteristics of long time,high emission,complex composition and large fluctuation.During this period,a large amount of SO_(2) may accumulate.Therefore,it is necessary to take measures to achieve SO_(2) emission reductions during the start-up and shutdown processes.Method Aiming at SO_(2) and H_(2)S in tail gas,a desulfurization process by tail gas absorption-adsorption coupling method was proposed.And the research focused on the absorption of SO_(2) using an alkaline solution and the adsorption of H_(2)S onto a renewable adsorbent.Results The alkaline solution absorption process could ensure that SO_(2) was almost completely absorbed,and basically did not absorb H_(2)S and CO_(2),which could avoid the excessive consumption of alkaline solution.13X molecular sieve had a good adsorption effect on H_(2)S and regenerative effect,which could adsorb circularly.The regenerated H_(2)S can also be recycled once the facility is restarted and operating stably.Conclusions The absorption of SO_(2) coupled with adsorption of H_(2)S in tail gas can ensure that the SO_(2) discharge of the natural gas purification plant is greatly reduced during the start-up and shutdown processes,and the process is simple with a high operational flexibility.

关 键 词：吸收 吸附 硫化氢 二氧化硫 13X分子筛 脱硫 尾气处理 SCOT 

分 类 号：TE64[石油与天然气工程—油气加工工程]