摘要
为有针对性地进行CFB(循环流化床锅炉)锅炉设计以及优化锅炉运行参数,需了解煤泥CFB燃烧NO_x排放特性及其影响因素。本文通过对一台20 t煤泥循环流化床锅炉进行相应的测试分析,得到NO_x排放浓度随床温和氧量的变化规律。研究结果表明,维持锅炉炉膛过量空气系数1.2,下料层床温由800℃升到935℃的过程中,NO_x浓度由296 mg/m^3上升到341 mg/m^3;维持下料层床温905℃,烟囱中部烟气氧含量由9.3%升到10.5%的过程中,NO_x排放浓度由285 mg/m^3上升至377 mg/m^3。在控制下料层床温和炉膛氧含量这两个参数条件下,可使得烟囱中部NO_x排放浓度水平整体降低,平均排放不高于250 mg/m^3,整体保持在300 mg/m^3以下,符合限定地区污染物排放要求。在一定运行参数范围内,NO_x排放浓度随下料层床温升高而增大,随氧量升高而增大。
The technology of coal slime circulating fluidized bed combustion is very promising,but with increasingly stringent pollutant emission standards,the inherent advantages of low NO_x emission in circulating fluidized bed are challenged.In order to optimize CFB( circulating fluidized bed boiler) design and adjust the operation targets,there is a need in better understanding the slime CFB combustion NO_x emission characteristics and their influencing factors.In this paper,a 20 t circulating fluidized bed boiler of coal slime is analyzed by the corresponding test,and the NO_x emission concentration variation trend with the bed temperature and oxygen is obtained.The results show that within a certain range of parameters,NO_x emission concentration can increase with the bottom bed temperature and oxygen content.
出处
《热能动力工程》
CAS
CSCD
北大核心
2017年第11期68-72,共5页
Journal of Engineering for Thermal Energy and Power
关键词
煤泥
循环流化床锅炉
NOX排放特性
coal slime
circulating fluidized bed boiler
NOx emission characteristics
