煤气间接冷却改造后脱硫系统副盐升高的原因分析及对策  

Cause and countermeasure of secondary salt increase in desulfurization system after indirect cooling renovation of semi-water gas

作　　者：武志胜[1] 袁强强 Wu Zhisheng;Yuan qiangqiang(Shanxi Jinfeng Coal Chemical Co.,Ltd.,Gaoping Shanxi 048400,China)

机构地区：[1]山西晋丰煤化工有限责任公司,山西高平048400

出　　处：《煤化工》2024年第2期15-18,共4页Coal Chemical Industry

摘　　要：传统固定层常压间歇式气化炉半水煤气采用循环水直接冷却,存在有害物质向空气中逸散的问题。根据国家环保政策要求,山西晋丰煤化工有限责任公司将煤气直接冷却改造为间接冷却。改造后,煤气循环水有害气体逃逸问题得以解决,但煤气中氰化氢被带往一次脱硫工段,并形成硫氰酸钠副盐,造成脱硫塔堵塞与物料消耗过高。介绍了硫氰酸盐的形成机理,并重点就脱硫溶液分盐技术和NHD溶液脱硫技术两种改造方案进行了分析。The semi-water gas produced by the traditional atmospheric pressure intermittent gasifier was cooled directly by the circulating water,which caused harmful substances escaping into the air.As per requirements of the national environmental protection policy,Shanxi Jinfeng Coal Chemical Co.,Ltd.had transformed direct gas cooling into indirect cooling.After the renovation,the problem of harmful gas escaping from circulating water could be solved,but the hydrogen cyanide in the gas was carried to the primary desulfurization section,forming the sodium thiocyanate,resulting in blockage of the desulfurization tower and excessive material consumption.The formation mechanism of thiocyanate was introduced,with key analysis on two modification schemes:desulfurization solution salt separation technology and NHD solution desulfurization technology.

关 键 词：常压间歇式气化炉 半水煤气 间接冷却 直接冷却 硫氰酸钠 溶液分盐技术 NHD脱硫 

分 类 号：TQ546.5[化学工程—煤化学工程]