350 MW墙式切圆锅炉超低负荷稳燃优化  

Optimization of Stable Combustion at Ultra-Low Load for 350 MW Wall Tangentially Fired Boiler

作　　者：刘涛 薛艳芳 王云刚[1] 邹立 张益嘉 沈涛[3] 赵钦新[1] LIU Tao;XUE Yanfang;WANG Yungang;ZOU Li;ZHANG Yijia;SHEN Tao;ZHAO Qinxin(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;China Nuclear Power Engineering Company Limited,Beijing 100840,China;Harbin Boiler Company Limited,Harbin 150046,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]中国核电工程有限公司,北京100840 [3]哈尔滨锅炉厂有限责任公司,哈尔滨150046

出　　处：《西安交通大学学报》2025年第3期99-109,共11页Journal of Xi'an Jiaotong University

基　　金：国家重点研发计划资助项目(2021YFC3001803)。

摘　　要：为获得墙式切圆燃煤锅炉在20%额定负荷下燃烧和污染物排放特性,以国内某台350 MW超临界墙式切圆燃煤锅炉为研究对象,研究了其在20%超低负荷下不同燃烧器水平摆角和一次风中掺混不同比例氢气(以热量计算)共燃对烟气温度和烟气主要成分的影响。结果表明:增大燃烧器水平摆角能够缓解20%负荷下锅炉近壁面空气流速较高的问题,但会导致煤粉初期着火延迟,推荐将水平摆角设置为15°;H_(2)共燃比为15%时,主燃区截面平均烟气温度最高达到1592 K,比初始工况提高了34 K,共燃比的增加导致炉膛平均温度降低,推荐H_(2)共燃比取15%;NO x排放随着H_(2)共燃比的增加呈现先上升后下降的趋势,共燃比为20%时NO x排放比初始工况下降了21.2%,CO_(2)排放也降低了18.2%,但出口烟气中H_(2)O的摩尔分数增加了20.8%,容易造成低温腐蚀,需要对相关设备进行防腐处理。To investigate the combustion and pollutant emissions characteristics of a wall tangentially fired pulverized-coal boiler operating at 20% of its rated load,this paper focus on a 350 MW supercritical wall tangentially fired pulverized-coal boiler in China.The research explores the impacts of varying burner horizontal swing angles and different proportions of hydrogen(calculated by calorific content)in the primary air on flue gas temperature and the main components of flue gas under a 20% ultra-low load.The findings suggest that increasing the horizontal swing angle of the burners can mitigate the issue of high air velocity near the boiler walls at 20% load.However,this adjustment may result in a delay in the initial ignition of pulverized coal.It is advised to set the horizontal swing angle to 15°.With an H_(2) co-firing ratio of 15%,the average flue gas temperature at the main combustion zone cross-section reaches up to 1592 K,marking a 34 K increase from the initial conditions.Nevertheless,a rise in the co-firing ratio leads to a decline in the average furnace temperature,with a recommended H_(2) co-firing ratio of 15%.Regarding NO x emissions,they exhibit an initial increase followed by a decrease with the rise in the H_(2) co-firing ratio.At a co-firing ratio of 20%,NO x emissions decrease by 21.2% compared to the initial conditions,and CO_(2) emissions also witness an 18.2%reduction.However,the molar fractions of H_(2)O in the outlet flue gas see a 20.8% increase,posing a risk of low-temperature corrosion.Hence,it is crucial to implement corrosion prevention measures for the relevant equipment.

关 键 词：墙式切圆锅炉 低负荷稳燃 燃烧器水平摆角 H 2共燃比 

分 类 号：TM621.2[电气工程—电力系统及自动化]