为了研究循环流化床锅炉(circulating fluidized bed boiler,CFB)的空气预热器和烟气处理设施对SO3的脱除作用，利用控制冷凝法分别对装机容量在150~330 MW之间的10台循环流化床锅炉进行了实测。结果表明：空气预热器对SO3的脱除率受空气预热器烟气出口温度的影响，在6.7%~36.5%之间，回转式空气预热器的SO3脱除率高于管式空气预热器；布袋除尘器和电袋除尘器对SO3的脱除率在40%以上；静电除尘器的SO3脱除率在6.1%~10.8%之间；湿法脱硫的SO3脱除率在41.7%~73.4%之间，其中双塔双循环的SO3脱除率最高；炉外CFB半干法脱硫的SO3脱除率达89.7%~97.9%，测试条件下炉内干法+炉外CFB半干法的工艺能使脱硫出口SO3降至0.3 mg/m3以下。

In order to study the effect of the air preheater and flue gas treatment facility of circulating fluidized bed (CFB) boiler on the removal of SO3,the controlled condensing method was used to analyze 10 CFB boilers with installed capacity between 150 MW and 330 MW respectively.The results show that the removal rate of SO3 by the air preheater is affected by the outlet flue gas temperature,which is between 6.7% and 36.5%.The SO3 removal rate of the rotary air preheater is higher than that of the tubular air preheater.The SO3 removal rates of cloth bag precipitator and electric bag precipitator are more than 40%; the SO3 removal rate of electrostatic precipitator is between 6.1% and 10.8%.The SO3 removal rate of wet flue gas desulfurization(WFGD) is between 41.7% and 73.4%,among which the double tower and double circulation SO3 removal rate is the highest.The SO3 removal rate of CFB semidry desulfurization outside the furnace is between 89.7% and 97.9%.Under the test conditions,the process of furnace dry method with the addition of semidry method outside the furnace can reduce SO3 at the outlet of desulfurization to below 0.3 mg/m3.

X701.3

内蒙古电力科学研究院自筹科技项目（2019-ZC-06）