富燃料区喷氨降低NO_x排放浓度的热态试验研究  

Study on Hot-state Test of Reduction of NO_x Emission Concentration by Injecting NH_3 in Fuel-rich Zone

作　　者：荣燕燕 毕德贵[1] 李明强[1] 张忠孝[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海200090

出　　处：《热能动力工程》2016年第3期120-124,145-146,共5页Journal of Engineering for Thermal Energy and Power

摘　　要：对某热电厂75 t/h煤粉锅炉进行了富燃料区喷氨技术改造,以降低NO_x排放浓度。在改造后的实际运行的煤粉锅炉上进行了热态试验,研究了氨氮比、O_2浓度和温度对脱硝效率的影响。试验结果表明:当氨氮比为1.5时,采用富燃区喷氨技术可在空气分级技术改造的基础上,将NO_x排放浓度降低至50%左右;当氨剂喷入位置处的温度超过1200℃时,会引起NO_x排放浓度的增加;当氨氮比为1.5、4角位置处喷射尿素时,空气分级联合富燃料区喷氨可以达到约70%的脱硝率。The technical renovation and modernization were made for a 75 t / h pulverized coal fired boiler of a certain thermal power plant with the purpose of reducing the NO_xemission concentration. By a hot-state test for the modified pulverized coal fired boiler,the influences of NH_3/ NO_x ratio( NSR),O_2 concentration and temperature on the denitration efficiency were studied in this paper. The test results indicate when NSR is 1. 5,the technology of injecting NH_3 in fuel-rich zone can lower the NO_x emission concentration to about 50% on the basis of the air classification technology reform; When the temperature in the area of injecting NH_3 is higher than 1 200 ℃,NO_x emission concentration will increase; When NSR is 1. 5 and NH_3 is injected from the four corners,about 70% denitration efficiency can be achieved by the means of combination of the air classification technology and the technology of injecting NH_3 in fuel-rich zone.

关 键 词：富燃料区喷氨 脱硝效率 氨氮比 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]