湿法脱硫后高湿烟气中SO<sub>3</sub>酸雾监测方法研究

李欣怡; 岳修鹏; 张亚平; 杨林军

引用本文:	李欣怡，岳修鹏，张亚平，杨林军.湿法脱硫后高湿烟气中SO₃酸雾监测方法研究[J].环境监控与预警,2020,12(2):24-30
	LI Xin-yi,YUE Xiu-peng,ZHANG Ya-ping,YANG Lin-jun.Study on Monitoring Method of SO₃ Acid Mist in High humidity Flue Gas after Wet Desulfurization[J].Environmental Monitoring and Forewarning,2020,12(2):24-30

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湿法脱硫后高湿烟气中SO₃酸雾监测方法研究
李欣怡，岳修鹏，张亚平，杨林军
东南大学能源与环境学院，江苏南京 210096

摘要:

利用三氧化硫（SO₃）发生装置以及模拟烟气湿法脱硫系统，研究了烟气再热温度、恒温水浴温度、采样速率、冷凝管类型规格及吸收瓶个数等不同采样参数对SO₃酸雾采集率的影响。结果表明，当烟气再热温度低于烟气酸露点时会导致SO₃酸雾收集率下降，采用控制冷凝法采样时应使用大流量（10 L/min）采样，冷凝管应选择外套长度为400 mm的蛇形螺旋冷凝管，并将冷凝管置于温度为65 ℃左右的恒温水浴中；用碱液吸收法采样时应串联3个吸收瓶后，使用小流量（1 L/min）采样。烟气温湿度、二氧化硫（SO₂）浓度以及烟气中共存组分等对碱性吸收法的采集影响较大，而对控制冷凝法几乎没有影响。因此确立了针对湿法脱硫后高湿烟气环境下SO₃酸雾的监测方法为控制冷凝法更为适宜。

关键词: SO₃酸雾湿法脱硫系统控制冷凝法碱液吸收法

DOI：

分类号:X830.2

文献标识码:A

基金项目:江苏省环境监测科研基金资助项目（1412）

Study on Monitoring Method of SO₃ Acid Mist in High humidity Flue Gas after Wet Desulfurization

LI Xin-yi,YUE Xiu-peng,ZHANG Ya-ping,YANG Lin-jun

Southeast University School of Energy and Environment,Nanjing,Jiangsu 210096,China

Abstract:

Using SO₃ generating device and simulated flue gas wet desulfurization system, the effects of different sampling parameters such as flue gas reheating temperature, constant temperature water bath temperature, sampling rate, spiral tube size and number of absorption bottles on SO₃ acid mist collection efficiency were studied. The results showed that when the flue gas reheating temperature was lower than the acid dew point of flue gas, the SO₃ acid mist collection rate would decrease. When using the controlled condensation method, a large flow rate (10L/min) should be used, and a spiral condenser should be selected with a length of 400mm, which should be placed in a constant temperature water bath at a temperature of about 65 ℃. When sampling with alkaline absorption method, a small flow rate (1L/min) should be used, and three absorption bottles should be used in series. The temperature and humidity of the flue gas, the concentration of SO₂, and the coexisting components in the flue gas had great influence on the alkaline absorption method, but had little effect on the controlled condensation method. Therefore, controlled condensation method is more accurate when monitoring SO₃ acid mist in high humidity flue gas after wet desulfurization.

Key words: SO₃ acid mist Monitoring method Wet flue gas desulfurization Controlled condensation method Alkaline absorption method