SNCR+SCR烟气联合脱硝工艺在电站锅炉中的应用

简述了选择性非催化还原（SNCR）+选择性催化还原（SCR）烟气联合脱硝技术原理，针对某电厂5号机组（装机容量130 MW）氮氧化物（NOx）排放超标问题，通过CFD数值模拟，制定了SNCR+SCR烟气联合脱硝工艺。首先采用低氮燃烧技术，将锅炉NOx排放控制在350 mg/m3以下，并且保证SNCR区域较低CO浓度；其次采用SNCR技术，将SCR脱硝装置前NOx质量浓度控制在200 mg/m3以下；最后采用SCR技术，将锅炉出口烟气NOx质量浓度控制在90 mg/m3以下，实现了重点地区NOx达标排放。

The Application of SNCR+SCR United Flue Gas Denitration Technique in Power Generation Boilers

Regarding the NOx emission over national standard in Unit 5 of(130 MW) a power plant, this article briefly introduces the fundamentals of SNCR+SCR united flue gas denitration technique and establishes the corresponding implementation procedures through CFD numerical simulation. Firstly, the low-nitrogen combustion technique is utilized to control the boiler NOx emissions under 350 mg/m3 and guarantee low CO concentration in the SNCR zone. Secondly, the SNCR technique is adopted to control the NOx concentration before SCR under 200 mg/m3. At last the SCR technique is adopted to control the NOx emission concentration under 90 mg/m3. In this way, the NOx emissions can meet the related standards in major regions.