硫黄回收装置的优化

Optimization of sulfur recovery unit

介绍了中国石油化工股份有限公司金陵分公司不断优化硫黄回收装置的工艺技术和保证硫黄回收装置总硫回收率的技术措施及降低尾气中SO2平均排放浓度的效果。通过消化吸收引进技术,改进装置开停工方案以及优化运行操作,实现装置安稳长优运行,完善与发展硫黄回收技术。针对公司原料酸性气组成与量变化较大,优化了3套装置酸性气的分配;使用多种功能的国产化制硫催化剂和尾气处理加氢催化剂,控制与催化剂相适宜的反应温度;处理了酸性水汽提产出的NH3含量较高的酸性气;尾气中SO2的平均排放的质量浓度逐步下降到400mg/m3以下,使硫回收率达到99.95%,Claus(克劳斯硫回收)最大转化率在95%左右。提出了装置还需进一步优化的方案,以进一步降低尾气中SO2的排放浓度,以满足即将执行的国家环境保护部颁布的SO2排放新标准。

Here described are the continuous optimization of process technologies of sulfur recovery unit in SINOPEC Jinling Company, the technical measures to ensure the total sulfur recovery rate and reduction of SO2 emission of the tail gas. After extensive study of the unit operation, the start-up and shutdown schemes as well the operation of the unit are optimized, the long-term stable operation is realized and the sulfur recovery technologies are further improved. As there is a large variation of compositions of feed sour gas compositions, the sour gas distribution of sour gas stripper III is optimized and multi-function sulfur making catalysts and tail gas treatment catalysts are applied to control reaction temperature which is appropriate for the catalysts. The sour gas containing higher NH3 from sour water stripper is treated. The emission concentration of SO2 in tail gas is gradually reduced to lower to lower than 400 mg/m3 , the sulfur recovery rate reaches 99.95% and max- imum conversion of Claus is about 95%. Further optimization of the unit is required to further reduce the emission concentration of SO2 so as to meet the emission standard of SO： issued by China National Environmen- tal Protection Ministry.