脱硫工艺升级在煤化工超低排放改造中的应用

Application of desulfurization process upgrade in ultra-low emission transformation of coal chemical industry

针对某大型煤化工企业氨-硫酸铵法脱硫装置脱硫效率低、出口颗粒物和NH_(3)逃逸高的问题,对其脱硫工艺进行升级改造。对改造后的氨法脱硫系统进出口SO_(2)浓度、颗粒物浓度、NH_(3)浓度、NO_(x)浓度进行性能测试和连续运行监测。结果表明,氨法脱硫系统出口主要污染物排放可稳定达到超低排放水平。对氨法脱硫系统主要设备内溶液的运行pH进行连续监测,分析其NH_(4)HSO_(3)和(NH_(4))_(2)SO_(3)占比,建议提高NH_(4)HSO_(3)的氧化率和再生率,以提高脱硫效率和结晶产物纯度。

It is desulfurization process upgraded in response to the problems of low desulfurization efficiency,high outlet smoke and ammonia escape in the ammonia flue gas desulfurization device of a large coal chemical enterprise.Performance testing and continuous operation monitoring were conducted on the inlet and outlet SO_(2)concentration,particulate matter concentration,ammonia concentration,and NO_(x)concentration of the renovated ammonia desulfurization system.The main pollutant emissions from the outlet of the ammonia desulfurization system can stably reach ultra-low emission levels.The operating pH of the solution in the main equipment of the ammonia desulfurization system was continuously monitor,the proportion of NH_(4)HSO_(3)and(NH_(4))_(2)SO_(3)were analyzed.It is suggested that increasing the oxidation and regeneration rates of NH_(4)HSO_(3)can improve desulfurization efficiency and crystal product purity.