燃煤机组NO_x控制研究

Study on the NO_x Contrl in Coal-fired Power Plant

福州电厂5#、6#机组采用哈尔滨锅炉厂墙式切圆燃烧锅炉,自投产以来2台炉NOx生成量偏差较大,且5#炉SCR(选择性催化还原技术)入口NOx浓度较高,通过调整一次风率、送风分配、改进配煤掺烧等方法后,NOx产生量有明显降低。介绍了福州电厂5#、6#机组的燃烧系统,分析了NOx生成机理,提出了NOx的控制方法。

Wall Type Tangentially-fired boiler that was produced by Harbin Boiler Factory was adopted in 5# and 6# units in Fuzhou Power Plant. Since the first operation, the NOx production deviation in these two boilers is much larger. In addition, concentration of NOx at the SCR-entrance in 5# boiler is higher than expected. However, the NOx production can be significantly reduced by some remarkable methods such as improving： the coal blending and adjusting the primary air rate and the wind distribution. This paper introduced combustion systems of 5# and 6# units used in Fuzhou Power Plant, analyzed the formation mechanism of NOx, and proposed its control method.