SNCR配合SCR在W型锅炉脱硝中的应用

Application of SNCR and SCR in Denitration of W-type Boilers

W型锅炉因其特殊性,低氮燃烧器改造后NOx含量仍然较高,采用SCR技术脱硝效率高,但投资费用高。某电厂660 MW机组W型锅炉为解决上述问题,采用SNCR+SCR技术,将原有3+1层的最上层蜂窝式催化剂更换为板式催化剂,同时采用国外最先进的CFD+CKM流场模拟技术软件,以及尿素溶液喷枪、流量计和调节门等进口产品,合理设置喷枪层数与位置,运用分区动态喷氨调节系统实时监测,达到脱硝超低排放要求,为火电厂W型锅炉的脱硝超低排放改造提供参考。

Due to its particularity,W-type boilers still emit high NOx after using a low-nitrogen burner,and the employment of SCR technology can achieve high denitration efficiency but cost too much.In order to solve the above problem,a certain power plant adpoted SNCR+SCR technology to its W-type boilers of 660 MW generator unit,to be exact,using a layer of board-type catalyst to replace the top of the three layers of honeycomb catalyst,employing the most advanced CFD+CKM flow-field-simulation software,installing a reasonable number of urea solution sprays at proper positions,flowmeters,dampers and other imported products,and using a real-time system of monitoring ammonia injection in different areas.This transformation enabled the plant to meet the denitration ultra-low emissions requirements,and can help other thermal power plants achieve their goals of denitration ultra-low emissions.