75 t/h中温分离CFB锅炉增加三层二次风的低氮燃烧改造  

Low-NOxCombustion Retrofit of a 75 t/h MT Separated CFB Boiler by Adding the Third Layer of Secondary Air

作　　者：吴剑恒[1,2] 俞金树 何宏舟[1] 庄松田[2] 

机构地区：[1]集美大学福建省能源清洁利用与开发重点实验室,福建厦门361021 [2]福建省石狮热电有限责任公司,福建石狮362700 [3]福建省鸿山热电有限责任公司,福建石狮362700

出　　处：《发电设备》2016年第3期177-182,共6页Power Equipment

摘　　要：分析了影响75 t/h中温旋风分离CFB锅炉NOx排放质量浓度的主要因素,采取增设一层上二次风形成三层二次风、抬高下二次风喷口高度、提高二次风喷口速度和增加二次风率等措施进行低氮燃烧改造。结果表明：NOx排放质量浓度从180 mg/m3左右降低到140 mg/m3左右,2台CFB锅炉每年可以减少NOx排放量44.62 t,且锅炉机械不完全燃烧损失q4降低了1.0%~1.5%。By analyzing the main factors influencing the NOx emission of a 75 t/h circulating fluidized bed （CFB） boiler with medium-temperature （MT） cyclone separators, a low-NOx combustion retrofit was conducted by adding the top layer of secondary air to form in total three layers of secondary air, elevating the nozzle height of bottom secondary air, raising the velocity at secondary air nozzles, and increasing the secondary air rate, etc. Results show that after the retrofit, the NOx emission has been reduced from original 180 mg/m3 to 140 mg/m3 , thus the total annual reduction of NOx emission would get up to 44.62 t for the two CFB boilers, and the unburned carbon loss q4 would drop by 1.0%-1.5%.

关 键 词：CFB锅炉 中温旋风分离 NOx排放质量浓度 二次风率 无烟煤 机械不完全燃烧损失 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]