湿式电除尘器SO3、HCl、HF脱除效率试验研究

燃煤电厂湿法脱硫后烟气中含有SO₃、HCl、HF等强腐蚀性物质，虽然含量不高，但对烟囱抗腐蚀性能提出了更高的要求。湿法脱硫后加装湿式电除尘器，对SO₃、HCl、HF等有一定的脱除效果，为研究湿式电除尘器对其脱除效率，在某电厂330 MW机组金属极板式湿式电除尘器进出口对烟气进行采样，检测SO₃、HCL、HF的浓度，得出湿式电除尘器对这些强腐蚀性酸性气体的脱除效率分别为45%、85%及65%左右。结果表明湿式电除尘器可有效脱除烟气中的腐蚀性气体，降低其在烟囱入口浓度，因而可减缓烟囱腐蚀。

Experimental Study on SO3, HCl and HF Removal Efficiency of Wet Electrostatic Precipitator

In coal-fired power plants, the flue gas after wet desulphurization still contains strong corrosive substances such as SO₃, HCl, HF and so on. Higher requirements are put forward for the corrosion resistance of the chimney even though the content is not that high. The wet electrostatic precipitator installed after the desulphurization has certain removal effect for the corrosive substances. In order to study the removal efficiency of wet electrostatic precipitator, samples were taken from the inlet and outlet flue gas of a metal plate type wet precipitator in a 330 MW unit of a power plant to detect the concentration of SO₃, HCl and HF. It is concluded that the removal efficiency of the wet electrostatic precipitator for the strong corrosive acid gases was 45%, 85% and 65%, respectively. The results show that the wet electrostatic precipitator can effectively remove the corrosive gas in the flue gas and reduce its concentration at the inlet of the chimney, and therefore the corrosion rate of chimney can be slowed down.