燃尽风与水平浓淡燃烧联用对NO_x生成的影响  

Effects of Combined Application of OFA and Horizontal Bias Burner on NO_x Emission Characteristics

作　　者：张晓辉[1] 孙锐[1] 孙绍增[1] 秦明[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

出　　处：《中国电机工程学报》2007年第29期56-61,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50576020);新世纪优秀人才支持计划项目(NCET-05-0336)~~

摘　　要：　针对燃烧器采用四角切网矩形炉膛伽置方式的某燃刖烟煤220t／h锅炉，在主燃烧区域通过采用水平浓淡燃烧器、在三次风上层加装高位燃尽风喷口（SOFA），采取燃料水半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SOFA对锅炉NOx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，煤粉由上层一次风喷口至OFA喷口间的流动时间保持任0．32S左右时，采用合理的二次风配风调节方式，主燃烧器区域过量空气系数控制在0．85时，机组NOx排放量可降低到450mg／m^3以下。同时，对飞灰含碳量影响较小，保持在1．6％-2％之间，有效避免了过热器超温问题。An experimental investigation to reduce the NOx emission during burning bituminous coal has been carried out in a 220 t/h tangential pulverized coal firing rectangle furnace, with a technique combining horizontal bias combustion （HBC） burners in the primary zone and retrofitted seperated over fire air （SOFA） nozzles above the tertiary air. The influences of SOFA on NOx emission and unburned carbon in fly ash were experimentally studied. Results show that the amount of NOx emission is decreased to less than 450 mg/m^3 adopting the suitable arrangement of OFA, when the time equals 0.32s as the fuel flows from top primary air to OFA, and reasonable distribution of secondary air, when the excess air coefficient equals 0.85. The unburned carbon content in fly ash is as low as 1,6%-2% at the same time. Adjusting the distribution of secondary air can also improve the tube temperature distribution of superheater.

关 键 词：分级燃烧技术 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]