超超临界双切圆燃烧锅炉多煤种掺烧下水冷壁结渣特性的数值模拟  

Numerical Simulation of Slagging Characteristics of Ultra Supercritical Double-tangential Circular Fired Boiler Water Wall Under the Combustion of Multiple Coals'Blending

作　　者：董磊[1,2,3] 陈曦[1,2,3] 马启磊 徐民 DONG Lei;CHEN Xi;MA Qilei;XU Min(State Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Institute of Science and Technology for Carbon Neutrality,Southeast University,Nanjing 210096,China;SEU-Monash Joint Graduate School(Suzhou),Suzhou 215123,Jiangsu Province,China;East China Electric Power Test and Research Institute,China Datang Corporation Science and Technology Research Institute Co.,Ltd.,Hefei 231299,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]东南大学碳中和科学技术研究院,南京210096 [3]东南大学-蒙纳什大学苏州联合研究生院,江苏苏州215123 [4]中国大唐集团科学技术研究院有限公司华东电力试验研究院,合肥231299

出　　处：《动力工程学报》2024年第2期241-250,共10页Journal of Chinese Society of Power Engineering

摘　　要：对某1000 MW超超临界双切圆燃烧锅炉水冷壁结渣特性进行数值模拟,探究多煤种掺烧对水冷壁结渣特性的影响规律并提出减少结渣的配煤原则。数值模拟结果表明:双切圆燃烧锅炉在燃烧时形成反向相切的双椭圆,长轴所对燃烧器近壁面温度水平较高,结渣倾向较高;当与煤种Ⅲ(高热值低灰分)、煤种Ⅱ(中等热值中等灰分)掺烧时,煤种Ⅰ(低热值高灰分)的入炉比例大于40%,炉膛各部位结渣倾向显著提高;煤种Ⅰ入炉比例为20%的工况能满足安全运行需要;配煤位置显著影响颗粒沉积的部位及沉积速率:当多煤种掺烧时,将煤质特性较差的煤种置于较低层燃烧器更为合理,煤种入炉比例相同时,调整入炉位置可以降低10.17%的颗粒沉积量,从而降低水冷壁结渣倾向。The slagging characteristics of the water wall of a 1000 MW ultra-supercritical double-tangential circular fired boiler were numerically simulated,the effect of the combustion of multiple coals'blending on water wall slagging characteristics was investigated and coal blending principles for anti-slagging were proposed.The numerical simulation results show that the double-tangential circular fired boiler forms a reverse tangential double ellipse during combustion,the temperature of the near-burner water wall that the long axis points to is higher,and the slagging tendency is higher.The slagging tendency in each part of the furnace is significantly increased when the proportion of coal I with low calorific value and high ash content is above 40%while blending with the coalⅢwith high calorific value and low ash content and the coalⅡwith middle calorific value and medium ash content.When the proportion of coal I is under 20%,the boiler operation safety can be guaranteed.The position where coal enters the furnace can significantly affect the position and the rate of particle deposition.It is more reasonable to place the coal with relatively poor properties in the lower burner under the combustion of multiple coals'blending.When the proportion of coals in the furnace is the same,adjusting the position of coal in the furnace can reduce the amount of particle deposition by 10.17%,so as to reduce the slagging tendency of the water wall.

关 键 词：双切圆燃烧锅炉 数值模拟 结渣特性 配煤掺烧 

分 类 号：TK227.2[动力工程及工程热物理—动力机械及工程]