硫磺回收装置尾气超低排放处理的设计和运行

国内某炼油厂硫磺回收装置首次应用专有气液混合器，通过钠碱湿法烟气脱硫工艺实现尾气超低排放，排放烟气中SO2的浓度为10～25 mg/m3（标准状况），脱硫率大于95%，烟气流量操作范围为0～120%，满足硫磺回收装置各种工况下的尾气超低排放。在国内硫磺尾气超低排放处理中首次采用气气换热提升烟气温度，有效减少了冒白烟现象，且解决了烟气管道和设备的硫露点腐蚀问题，同时节能4 950 MJ/h，节水和减排0.64 t/h。

DESIGN AND OPERATION OF SRU TAIL GAS TREATMENT FOR ULTRA-LOW EMISSION

A proprietary gas-liquid mixer was first applied in SRU of a refinery. The tail gas ultra-low emissions were achieved through sodium alkali wet flue gas desulfurization process. The concentration of SO2 in the clean gas is 10 - 25 mg / m3 with desulfurization rate of ≥95% in 0-120% of flue gas flow range. The technology can meet ultra-low emission for tail gas under the various operating conditions of SRU. GGH was first applied to tail gas ultra-low emission in domestic SRU，it enhances the flue gas temperature, reduces white mist effectively and solves the problem of sulfur dew point corrosion in flue gas pipelines and equipments. Meanwhile，GGH saves energy 4 950 MJ / h, decreases water 0.64 t/h and flue gas emission 840m3/h.