1000MW超超临界双切圆燃煤锅炉炉膛燃烧特性模拟  

Numerical simulation on combustion of a 1000 MW ultra supercritical dual tangential circle boiler

作　　者：周亚明 王新宇[2] 黄亚继[2] 高瑞斌 蒋欣军 万旭 刘宇谦 刘晓东 戴维葆 陈国庆 ZHOU Yaming;WANG Xinyu;HUANG Yaji;GAO Ruibin;JIANG Xinjun;WAN Xu;LIU Yuqian;LIU Xiaodong;DAI Weibao;CHEN Guoqing(CHN Energy Taizhou Power Generation Co.,Ltd.,Taizhou 253200,China;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Guodian Science and Technology Research Institute Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]国家能源集团泰州发电有限公司,江苏泰州253200 [2]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [3]国电科学技术研究院有限公司,江苏南京210000

出　　处：《洁净煤技术》2021年第6期76-84,共9页Clean Coal Technology

基　　金：江苏省产业前瞻与共性关键技术资助项目(BE2017037)。

摘　　要：为探究双切圆锅炉燃烧规律,确定其高温腐蚀发生区域,以一台1000 MW超超临界双切圆燃煤锅炉为研究对象,采用Fluent软件模拟其炉膛燃烧运行。分析炉膛内速度场、温度场、O_(2)、CO和NO_(x)气体的分布,以探究双切圆锅炉的燃烧特性。结果表明:数值模拟结果与锅炉实测参数基本吻合;模拟的速度场、温度场和气体体积分数云图都存在2个对称分布的椭圆,符合双切圆锅炉的规律;温度和各气体沿高度方向截面平均体积分数分布符合低NO_(x)燃烧方式的规律;水平烟道烟气仍存在速度偏差和温度偏差,烟气速度和温度沿炉膛宽度都呈“M”型分布,极大值都出现在炉膛宽度12和22 m处,速度偏差和温度偏差会导致对流换热器热负荷偏差,建议在锅炉改造时既可以采用增大偏差管流量或减少受热管路长度的方法,预防偏差管超温,也可以使用反切风技术,消除残留余旋;由于烟气偏斜的现象,热角上游区域CO体积分数非常大,局部超过0.1,有发生高温腐蚀的风险,建议通过改变一次风入射角度的方法,减少切圆半径以防止烟气刷墙,同时可根据实际腐蚀情况,在水冷壁加装贴壁风装置,以保护水冷壁。In order to explore the combustion law of dual tangential boiler and determine its high-temperature corrosion area,a 1000 MW ultra supercritical dual tangential coal-fired boiler was taken as the research object,and Fluent software was used to simulate the furnace combustion operation.The velocity field,temperature field,distribution of O_(2),CO and NO_(x) in the furnace were analyzed to explore the combustion characteristics of double tangential boiler.The results show that the simulation results of numerical simulation method are basically consistent with the measured parameters of boiler.There are two symmetrically distributed ellipses in the simulated velocity field,temperature field and gas molar concentration,which conforms to the law of double tangential boiler.The distribution of temperature and average molar concentration of gas along the height direction conforms to the law of low NO_(x) combustion mode.There are still velocity deviation and temperature deviation in horizontal flue.The velocity and temperature of flue gas are distributed in"M"shape along the furnace width,and the maximum values appear at the furnace width of 12 and 22 m.The velocity deviation and temperature deviation will lead to the thermal load deviation of convective heat exchanger.It is suggested that during boiler retrofit,either the method of increasing the flow rate of deviation pipe or reducing the length of heating pipe can be adopted to prevent the deviation pipe from overheating,and the reverse cutting air technology can also be used to eliminate the residual swirling.Due to the phenomenon of flue gas deflection,the volume fraction of CO in the upstream area of the hot angle is very large,which is higher than 0.1 locally,and may cause high temperature corrosion.It is suggested that the tangential radius should be reduced by changing the incident angle of primary air to prevent the flue gas from brushing the wall.Meanwhile,the wall attached air device can be installed on the water wall to protect the water wall according to t

关 键 词：超超临界锅炉 双切圆燃烧 高温腐蚀 热偏差 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]