全燃烟煤的W火焰锅炉改造数值模拟研究  

Numerical Simulation Research on the Transformation of A W-flame Boiler with Full Combustion of Bituminous Coal

作　　者：赖金平 李朝兵 何陆灿 张文振 LAI Jinping;LI Chaobing;HE Lucan;ZHANG Wenzhen(Guoneng Nanjing Electric Power Test&Research Co.,Ltd.,Nanjing 210023,China;Yantai Longyuan Electric Power Technology Co.,Ltd.,Yantai 264006,China)

机构地区：[1]国能南京电力试验研究有限公司,江苏南京210023 [2]烟台龙源电力技术股份有限公司,山东烟台264006

出　　处：《山东电力技术》2024年第7期68-74,80,共8页Shandong Electric Power

基　　金：国家能源科学技术研究院有限公司科技项目(DY2022Y05)。

摘　　要：对某350 MW的W火焰锅炉进行全燃烟煤改造数值模拟。分析同等级下对冲旋流燃烧锅炉与W火焰锅炉燃烧器相对位置,表明W火焰锅炉采用对冲燃烧方式理论上可行。采用数值模拟方法,分析了改造方案对炉内速度分布、温度分布、氧量分布及炉膛出口参数的影响。数值模拟结果表明,采用对冲旋流燃烧方式后,提高了锅炉下炉膛火焰充满程度,提升了煤粉燃尽率,飞灰及大渣可燃物含量由1.3%、2.64%分别降低至0.53%、0.43%,炉膛出口NO_(x)质量浓度由647 mg/m^(3)升高至812 mg/m^(3);侧墙及翼墙近壁区处于还原性气氛中,存在结焦和高温腐蚀风险,须在侧墙及翼墙区域增加贴壁风系统;与燃用烟煤的对冲旋流燃烧锅炉相比,改造方案燃尽风率较低,须进一步提高燃尽风风率。All burning bituminous coal retrofit numerical simulation was conducted on a 350 MW W-flame boiler.The relative position of the burner of opposed swirl combustion boiler and W-flame boiler at the same level was analyzed.The results indicate that the use of opposed swirl combustion in W-flame boilers is theoretically feasible.The influence of the renovation plan on the velocity distribution,temperature distribution,oxygen distribution and parameters of furnace outlet was analyzed using numerical simulation methods.The numerical simulation results show that the use of opposed swirl combustion method improves the flame filling degree in the lower furnace of the boiler,enhances the coal powder burning rate,reduces the combustible content of fly ash and slag decreased from 1.3%and 2.64%to 0.53%and 0.43%,and increases the NO_(x)emission of the furnace outlet from 647 mg/m^(3)to 812 mg/m^(3).The area near side wall and wing wall are in reducing atmosphere,which poses a risk of coking and high-temperature corrosion.It is necessary to installed closing-to-wall air system on the side walls and wing walls.Compared with the opposed swirl combustion boiler which burning bituminous coal,the retrofit scheme has a lower exhaust air rate and further improvement of the exhaust air rate is needed.

关 键 词：W火焰锅炉 对冲旋流燃烧方式 燃尽率 NO_(x)排放 

分 类 号：TM621.2[电气工程—电力系统及自动化]