W火焰锅炉低负荷燃烧调整数值模拟研究  

Numerical simulation of combustion adjustment of a W-flame boiler at low loads

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作  者:郭子岗 刘帆 吴帅帅[3] 张海龙 张纯[3] 杨玉[3] 张一帆[3] GUO Zigang;LIU Fan;WU Shuaishuai;ZHANG Hailong;ZHANG Chun;YANG Yu;ZHANG Yifan(Shaanxi Yulin Energy Group,Yushen Coal and Electricity Co.,Ltd.,Yulin 719000,China;Huaneng 803 Thermal Power Generation Co.,Ltd.,Lanzhou 732850,China;Xi’an Thermal Engineering Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区:[1]陕西榆林能源集团榆神煤电有限公司,陕西榆林719000 [2]华能八〇三热电有限公司,甘肃兰州732850 [3]西安热工研究院有限公司,陕西西安710054

出  处:《热力发电》2025年第2期118-125,共8页Thermal Power Generation

基  金:陕西省创新能力支撑计划项目(2023-CX-TD-18)。

摘  要:针对W火焰锅炉在低负荷运行时再热汽温不达标问题,对某台W火焰锅炉低负荷燃烧调整进行了数值模拟研究。从空气预热器(空预器)进口抽取总烟气量的16%作为再循环烟气引入炉膛,增大烟气量,提高对流受热面的换热量,数值模拟分析了再循环烟气喷入位置和有无贴壁风对炉内速度场和温度场的影响规律。研究结果表明:再循环烟气从SOFA风喷口喷入炉膛,对下炉膛主燃区的温度影响较小,有利于低负荷时煤粉燃烧的稳定性;将40%再循环烟气作为贴壁风从下炉膛的侧墙送入炉膛能够降低侧墙烟气温度,同时把侧墙烟气变成氧化性气氛,降低侧墙结焦和高温腐蚀的可能性。When operating at low loads,W-flame boilers may encounter various problems,such as low reheated steam temperature,which requires combustion adjustments and other measures.To solve these problems,numerical simulations are conducted to investigate the combustion adjustment of a W-flame boiler under low load conditions.In order to deal with the low steam temperature at low loads,the influence of the position of the recycled flue gas injection and the presence of wall-attached air on the velocity field and temperature field inside the furnace were analyzed.The research results show that introducing recycled flue gas into the furnace by extracting 16%of the total flue gas flow at the air preheater inlet increases the amount of flue gas and improves the convective heat transfer on the heating surfaces.Combined with adjusting the opening of the reheater flue gas baffle,this approach can solve the problem of low reheated steam temperature at low loads.Injecting recycled flue gas from the SOFA air nozzle into the furnace has a minimal impact on the temperature in the primary combustion zone,which benefits the stability of coal combustion at low loads.Introducing 40%of the recycled flue gas as wall-attached air from the side walls of the lower furnace can lower the temperature of the side wall flue gas and transform it into an oxidizing atmosphere,reducing the possibility of side wall coking and high-temperature corrosion.

关 键 词:W火焰锅炉 低负荷 燃烧 再热汽温 

分 类 号:TM621.2[电气工程—电力系统及自动化]

 

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