200MW锅炉低NO_x燃烧系统改造与试验研究(英文)  

Experimental Study on a 200MW Boiler Retrofitted With Low NO_x Combustion System

作　　者：张晓辉[1] 孙锐[1] 孙绍增[1] 秦明[1] 庄国忠[2] 秦裕琨[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江省哈尔滨市150001 [2]北京国电龙高科环境工程技术有限公司,北京市宣武区100055

出　　处：《中国电机工程学报》2008年第17期8-14,共7页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(2006CB200303);2005年度教育部新世纪优秀人才支持计划项目(NCET-05-0336);国家自然科学基金项目(50576020)~~

摘　　要：针对某燃用烟煤的200MW机组采用四角切圆布置方式燃烧器的670t／h锅炉，在主燃烧区域采用水平浓淡燃烧器、加装燃尽风喷口，采取燃料水平分级与空气垂直分级结合的方式进行改造，降低氮氧化物（NOx）排放水平。研究了该低NOx燃烧系统对锅炉NOx/CO排放和飞灰可燃物的影响规律。试验结果表明，当采用合理的燃尽风布置合理的二次风配风调节方式，燃尽风份额控制在30％时，机组NOx排放量可降低到300mg/m^3以下；在任一工况下都不高于400mg/m^3，其中最低NOx排放浓度为250．84mg／m^3。同时，对飞灰含碳量影响较小，保持在1．5％-3％之间。An experimental investigation to reduce the NOx emission during burning bituminous coal was carried out on a 670 t/h tangential pulverized coal firing furnace, with a technique combining horizontal bias combustion （HBC） burners in the primary combustion zone and separated over firing air （SOFA） nozzles above the highest secondary air nozzles. The influence mechanisms of this low NOx combustion system on NOx/CO emission and unburned carbon in fly ash have been measured and studied in situ. The tests indicate the amount of NOx emission can be decreased to less than 300 mg/m^3 after adopting the reasonable distribution of secondary air, of which the OFA ratio is 30%. The concentration of NOx is lower than 400 mg/m^3 in any case, and the lowest concentration can reach 250.84 mg/m^3. Meanwhile, there is little effect on the unburned carbon content in fly ash which varies between 1.5 % and 3 %.

关 键 词：分级燃烧 燃尽风 水平浓淡煤粉燃烧器 NOx 排放 飞灰含碳量 煤粉锅炉 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]