脱硫装置SO2指标自动控制系统设计与投运

Design and Operation of SO2 Index Automatic Control System of Desulfurization Unit

针对某公司脱硫装置运行中外排烟气拖白尾现象严重,SO_2和颗粒物质量浓度超标,氨逃逸超标,以及液氨损耗量大,所得硫酸铵产品质量不合格等问题,设计出一种SO_2指标自动控制系统,并完成投运。结果表明,脱硫塔出口SO_2指标波动幅度大幅降低,介于15~30 mg/m^3,烟气排放无明显拖尾现象,且环保指标均得以实现;液氨利用率和硫酸铵结晶质量大幅提高,硫酸铵结晶颗粒粒径上升至0.5~2.0 mm。

In order to solve serious white tail,excess SO2 and particulate and ammonia in exhaust gas,large loss of liquid ammonia,and unqualified ammonium sulfate products in desulfurization unit operation of a company,an automatic control system for SO2 index is designed and put into operation.The results show that the fluctuation range of SO2 index at the desulfurization tower outlet is greatly reduced to 15—30 mg/m^3,no obvious white tail can be observed in the exhaust gas and the other environmental indexes are qualified;Both the utilization of liquid ammonia and the quality of ammonium sulfate crystal are greatly improved,and the particle size of ammonium sulfate crystal increase to 0.5—2.0 mm.