摘要
中国石油化工股份有限公司塔河分公司2×104 t/a硫黄回收装置于2004年10月底建成,12月7日开工,开工后经一年多调整工艺操作,硫黄装置尾气中SO2排放浓度达不到设计值,超标排放,经查找原因,有4大影响因素:①克劳斯系统不能精确配风;②尾气吸收塔填料直径大,溶剂循环量设计偏小;③溶剂温度高,冷却不下;④溶剂再生超负荷,造成贫液质量差。针对上述4个问题在2006年5月大修时进行技改,开工后尾气中SO2排放质量浓度为500～803 mg/m3。2011年国家环保部要求制硫尾气中SO2于7月1日后实施新标准400 mg/m3以下。根据这一标准,经分析原因及针对性调整工艺参数,分段查找影响因素,逐步修正工艺参数,使制硫尾气中SO2排放浓度逐步下降,最终使尾气中SO2排放质量浓度能控制在300 mg/m3以下。
The 20,000 TPY sulfur recovery unit in SINOPEC Tahe Company was started up in December 7,2004,In more than one year＇s operation after start-up,the tail gas SO2 emission of sulfur recovery unit failed to meet the design specifications,and the SO2 emission exceeded standard specifications.After extensive study,four major causes were located,i.e.1） imprecise air supply for Claus system,2） large diameter of packings in tail gas absorber and lower design solvent recycle rate,3） failure to cool down high-temperature solvent,4） poor lean solvent quality because of overload of solvent regeneration.To solve these problems,the unit was revamped in the turnaround in May,2006.The SO2 concentration in emission was 500-803 mg/m3 after revamping.In July 1,2011,China Environmental Protection Bureau began to implement new emission standard,which is lower than 400 mg/m3 for SO2 in tail gas of sulfur recovery unit.To meet the new standard,the off-specification causes were analyzed and process parameters were adjusted.As the result,the SO2 emission was gradually lowered and was finally reduced to 300 mg/m3.
出处
《炼油技术与工程》
CAS
2011年第12期45-49,共5页
Petroleum Refinery Engineering
关键词
硫黄回收
尾气处理
原因分析
治理措施
保护环境
sulfur recovery
tail gas treatment
cause analysis
treatment measures
environmental protection
