中文摘要：

简述选择性催化还原（SCR）烟气脱硝原理。指出SCR脱硝过程出现硫酸氢铵的危害,详细分析了硫酸氢铵形成的影响因素,如NH3/NOx摩尔比、SO3浓度、硫酸氢铵的露点温度等。根据硫酸氢铵的特性提出了控制硫酸氢铵生成的方法与减少其负面影响的措施：通过控制SCR脱硝过程氨逃逸量和烟气中SO2氧化率的方法减少硫酸氢铵的生成量;为防止催化剂因硫酸氢铵的滞留而失去活性,合理控制SCR脱硝装置在低负荷下的运行时间;为有效降低硫酸氢铵在空气预热器（空预器）换热元件上的形成速率,选用搪瓷镀层换热元件。

英文摘要：

The principle of selective catalystic reduction（SCR） denitrification process has been briefly expounded,pointing out the harmfulness of ammonium bisulfate（ABS） occurred in SCR denitrification process.The main affecting factors for ABS formation,such as the mole ratio of NH3/NOx,the SO3 concetration,and the dew point of ABS etc.,have been analysed in detail.According to the properties of ABS,the measures for controlling formation of ABS and recducing negative impacts of ABS have been put forward：through controlling the amount of ammonia escape in the SCR process and the oxidation rate of SO2 in the flue gas,the formation amount of ABS is to be reduced;in order to prevent the catalyst to lose its activity due to hold-up of ABS,the operating time of SCR under low load has to be reasonably controlled;for effectively decreasing the formation rate of ABS on heat-exchanging elements in the preheater,the ceramic coating has to be selected for said elements.