以脱硫喷淋塔出口的游离氨气为监测对象, 通过模拟烟气实验, 研究了吸收液的pH值、浓度、液气比(liquid to gas, L/G)和进口烟气温度等对氨逃逸量的影响. 实验结果显示, 随着吸收液pH 值、浓度和液气比的增加, 氨逃逸量逐渐增多. 为减少氨逃逸, 保证高脱硫率, 得到较为合适的工艺参数如下: pH=6.0, 吸收液浓度为1%, 液气比 为4 L/m3. 从氨逃逸和硫酸铵结晶两方面综合考虑, 进口烟气温度控制在90~110 ℃ 较为合适.
In the simulation of flue gas, free ammonia at the export of spray tower was used as the monitoring object. Factors of influence including pH value and concentration of absorption liquid, volume ratio of liquid to gas (L/G) and inlet gas temperature on the efficiency of flue gas desulphurization (FGD) were studied. Experimental results show that the amount of ammonia escape increases as the pH value, concentration of absorption liquid and L/G increase. To control ammonia escape and the high rate of desulphurization, appropriate parameters should be used, including pH value of 6.0, concentration of absorption ((NH4)2SO3) of 1%, L/G of 4 L/m3, and inlet gas temperature of 90~110 ℃.
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