高湿烟气中SO_(3)酸雾气溶胶监测方法研究

Research on Monitoring Method of SO_(3) Acid Mist Aerosol in High Humidity Smoke

提出了一种适用于高湿烟气中SO_(3)酸雾气溶胶监测方法。利用SO_(3)酸雾气溶胶生成系统及控制冷凝法采样装置,对不同采样流速、水浴温度、采样枪温度、改进装置和SO_(3)浓度等采样条件下的SO_(3)酸雾气溶胶收集率进行了实验研究。结果表明:使用控制冷凝法对SO_(3)酸雾气溶胶进行监测时,采样流速为4 L/min较为适宜,水浴温度应在70~80℃内,采样枪温度应高于酸露点温度;加装冲击式吸收瓶对控制冷凝法具有较好的改进效果;SO_(3)浓度的增加导致SO_(3)酸雾气溶胶收集率明显下降。控制冷凝法监测结果修正后可保证修正值与实际值之间的误差在5%以内。

To establish a method applied to monitoring SO_(3) acid mist aerosol in high humidity flue gas,the influence of different sampling conditions such as sampling flow rate,water bath temperature,sampling gun temperature,improvement of the device and SO_(3) concentration on the SO_(3) acid mist aerosol collection rate are experimentally studied using the SO_(3) acid mist aerosol generation system and the controlled condensation method.The results show that the most suitable sampling flow rate and water bath temperature are 4 L/min and 70~80℃ respectively,and the sampling gun temperature should be higher than the acid dew point temperature.The addition of the shock absorption bottle has a better improvement effect on the control condensation method.The increase of SO_(3) concentration leads to a significant decrease in the collection rate of SO_(3) acid mist aerosol.The monitoring value is corrected by linear regression method to ensure that the error between it and the actual value is within 5%.