125MW电站煤粉锅炉SNCR试验研究

Experimental research on SNCR applied in 125 MW power plant boiler

对于一台125MW煤粉锅炉,在常规煤粉分级配风燃烧技术改造的基础上,结合使用尿素溶液喷射的选择性非催化还原(SNCR)技术来降低锅炉NOx排放.试验主要在95MW和125MW 2个负荷下进行,单独对炉内还原区不同温度、不同n(NH3)/n(NO)、尿素溶液质量流量以及尿素雾化压力等工况进行试验.通过对试验结果进行分析,得到各个因素对脱硝率的影响及变化关系.试验结果表明,在各个负荷下,采用SNCR技术可以将NOx排放降至低于350mg/m3(体积分数为6%的O2),达到30%～45%的脱硝效率.

Selective non-catalytic reduction （SNCR） using urea solution injection was applied to a 125 MW boiler based on conventional pulverized-coal reburning process. Experiments were mainly conducted at the load of 95 MW and 125 MW, and the experimental conditions were varied independently by temperature, NH3/NO molar ratio, mass flow rate, and atomization pressure on NOx emission. Experimental results showed that NOx reduction ratio changed with the above factor. Results showed that NOx emission was below 350 mg/m3（6% 02 volume fraction） under varied loads with SNCR on operation, namely a NOx reduction of 30 %-45 % can be achieved.