大型天然气净化厂硫磺回收装置尾气SO_(2)减排技术  

SO_(2)emission reduction technology for tail gas of sulfur recovery unitin large-scale natural gas purification plant

作　　者：蔡盼 Cai Pan(Puguang Branch of SINOPEC Zhongyuan Oilfield,Dazhou,Sichuan 636156)

机构地区：[1]中国石化中原油田普光分公司,四川省达州市636156

出　　处：《炼油技术与工程》2024年第4期11-15,共5页Petroleum Refinery Engineering

摘　　要：GB 39728—2020《陆上石油天然气开采工业大气污染物排放标准》对新建及现有天然气净化厂硫磺回收装置大气污染物排放限值提出了更高的要求。为降低尾气SO_(2)排放浓度,实现含硫废气资源化利用,对高含硫天然气净化厂硫磺回收装置工艺技术进行了优化:(1)开发大型硫磺回收装置液硫池含硫废气回收工艺,将液硫池废气引入克劳斯炉进行硫元素回收;(2)开发大型硫磺回收装置深度热备开工技术,建立酸性气联通网,减少开工期间SO_(2)排放;(3)开发大型硫磺回收装置绿色停工工艺,利用热氮吹硫实现绿色停工。技术优化后,装置负荷100%时,尾气SO_(2)质量浓度可降至197 mg/m^(3),减少排放40%;停工期间,尾气SO_(2)排放浓度远低于甲烷吹硫模式,平均值可达237 mg/m^(3),满足GB 39728—2020对大型硫磺回收装置的SO_(2)排放要求。GB 39728—2020 has put forward mandatory requirements on the emission limits of atmospheric pollutants from newly built and existing sulfur recovery units in natural gas purification plants.In an effort to reduce the emission concentration of SO_(2)of tail gas and achieve the resource utilization of sulfur-containing waste gas,the process technology of sulfur recovery unit in high sulfur natural gas purification plant was optimized,including:①develop processes for recovering sulfur-containing waste gas from the liquid sulfur pool of large-scale sulfur recovery units,which introduces the waste gas from the liquid sulfur pool into the Claus furnace for sulfur element recovery;②develop deep hot standby start-up technology for large-scale sulfur recovery units,establishe an acidic gas interconnection network to reduce SO_(2)emission during start-up;③develop green shutdown process for large-scale sulfur recovery units,which utilizes hot nitrogen sulfur blowing mode to achieve green shutdown.After optimization,when the unit load is 100%,the mass concentration of SO_(2)of tail gas can be reduced to 197 mg/m^(3),with a reduction rate of 40%.During shutdown,the emission mass concentration of SO_(2)of tail gas is much lower than that of methane sulfur blowing mode,with an average value of 237 mg/m^(3),and meets the SO_(2)emission requirements of large-scale sulfur recovery units in GB 39728—2020.

关 键 词：天然气净化 硫磺回收 SO_(2)减排 含硫废气 深度热备开工 绿色停工 零废液 

分 类 号：TQ125.11[化学工程—无机化工] TE64[石油与天然气工程—油气加工工程] X74[环境科学与工程—环境工程]