硫磺回收装置烟气排放提标实践与探讨  

Practice and Discussion on How to Meet New SRU Flue Gas Emission Standards

作　　者：王喜亮 龚朝兵 党建军 花飞 王永娟 

机构地区：[1]中海油惠州石化有限公司,广东惠州516086

出　　处：《中外能源》2017年第7期86-90,共5页Sino-Global Energy

摘　　要：硫磺回收装置烟气中SO_2的主要来源是液硫脱气尾气和净化尾气,排放限值为≤100mg/m^3(特别限值地区),需通过操作优化和技术改造才能满足尾气达标排放。惠州石化1号硫磺回收装置烟气SO_2原始排放浓度为400mg/m^3,2014年将液硫脱气尾气由入焚烧炉改入制硫炉,烟气SO_2降至255mg/m^3。2016年加氢尾气选用进口高效脱硫剂,吸收塔顶净化尾气硫化物由100g/m^3降至20g/m^3,烟气SO_2浓度降至160mg/m^3(标准),提高贫液温度对吸收效果影响不大。排除液硫池废气干扰,烟气SO_2排放浓度在46~85mg/m^3(标准),低于排放限值100mg/m^3(标准)。2017年液硫池废气抽空器改型提高压力,抽气动力由蒸汽改为工业风,改入制硫炉后,将进一步减少SO_2排放约100mg/m^3。为保证硫磺烟气完全合格排放,计划于2018年增设净化尾气碱洗系统,采用气液接触面积大、接触时间短的文丘里湿式洗涤专利技术,最大限度吸收尾气中H_2S,可满足国家对于硫磺烟气SO_2排放浓度的严苛要求。The SO2 in flue gas from sulfur recovery unit （SRU） mainly comes fi＇om the sulfur compounds in liquid sulfur degassing tail gas and treated Claus tail gas,and the emission limits are 100mg/m3 （critical area）.The SRU needs to be revamped by applying new technologies and further optimizing the operation to meet the strict SO2 emission standards.The SO2 in the flue gas from the No.l SRU at CNOOC Huizhou Petrochemical Co.,Ltd.was decreased from 400mg/m3 to 255mg/m3 in 2014 via routing the liquid sulfur de- gassing tail gas to the Claus thermal reactor.In 2016,via converting MDEA solvent to the latest UcarsolTM tail gas treatment solvent,the total sulfur in the treated tail gas decreased from 100 ppm to 20 ppm and the SO2 in flue gas further decreased to 160mg/Nm3.There is little change in the sulfur removal performance while increasing the lean solvent temperature.While the liquid sulfur pool tail gas is not routed into the tail gas incinerator,the SO2 in the flue gas from SRU ranges from 46 to 85mg/Nm3,which is lower than the lat- est SO2 emission limits （lOOmg/m3）.In 2017,a mechanical compressor is planned to be installed to compress the liquid sulfur pool tail gas and route it into the Claus thermal reactor,so as to further reduce the SO2 e- mission by about 100mg/m3.To make sure that the SO2 emission meet the 100mg/m3 limitation,it is planned to install a patent Venturi Caustic Scrubber,which has large Gas-Liquid contact area and short contact time, to further remove sulfur from treated tail gas and to meet the most strict SOz emission limits.

关 键 词：硫磺回收 烟气 SO2 液硫脱气 高效脱硫剂 碱洗 

分 类 号：TQ125.11[化学工程—无机化工] X742[环境科学与工程—环境工程]