W火焰锅炉低氮燃烧控制机理研究  

Low NOxcombustion control mechanism of down-fired boilers

作　　者：严万军 曹亮[2] 房凡[1] 周虹光[1] 魏铜生[1] 徐党旗[1] 聂剑平[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]华能平凉发电有限责任公司,甘肃平凉744032

出　　处：《热力发电》2014年第12期61-65,共5页Thermal Power Generation

基　　金：国家科技部支撑计划项目(2011BAA04B01);中国华能集团公司重点科技项目

摘　　要：针对FW技术W火焰锅炉存在的NOx排放量高的问题,分析了其炉内燃烧及NOx生成特性,提出了引射回流、多点分级的低氮燃烧控制机理,并基于该控制机理对某台660MW机组FW技术W火焰锅炉进行了低氮燃烧改造。改造后测试结果表明,对于W火焰锅炉,仅通过增设OFA系统,并不能使NOx排放量大幅降低,应同时将拱下二次风移至拱上合适位置送入炉膛,在全炉膛实现引射回流、多点分级的低氮燃烧方式,可将NOx排放量降至理想水平。To solve high nitrogen oxide （NOx ）emission problem occurred in Foster Wheeler down-fired boilers,the combustion characteristics and NOx formation properties in the furnace were analyzed.The low NOx combustion control mechanism applying the “inj ection-reflux and multipoint-multistage”mechanism was developed.On the basis of this mechanism,the low NOx combustion retrofitting was carried out on a 660 MW unit boiler applying the Foster Wheeler technique.The experimental results after retrofitting indi-cate that the NOx emissions can not be reduced significantly by simply adding OFA system in down-fired boilers.The secondary air should be shifted from the rear and front wall to the right place of arches to real-ize the＂inj ection-reflux and multipoint-multistage＂mechanism in the whole furnace.Thus the ideal NOx e-missions level （≤800 mg/m3 ）can be reached.

关 键 词：W火焰锅炉 低氮燃烧 引射回流 多点分级 OFA NOX排放 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]