1139t/h超临界切圆锅炉气固两相流动数值模拟
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摘要
为研究1139t/h四角切圆燃烧锅炉炉内气固两相流动问题,采用标准k-ε模型和DPM模型数值研究3种典型负荷下炉内流动特性及固体颗粒运动轨迹.研究结果表明:在不同负荷下四角射流均能形成稳定切圆,但炉内气流偏斜严重易引起水冷壁的结渣;100%负荷下在炉膛壁面产生漩涡,颗粒对水冷壁造成冲刷;炉内合适的煤粉粒径能够保证煤粉在炉内的停留时间.研究结果对锅炉的热态燃烧调整提供理论依据.
To study the flow characteristics in furnace of a 1139 t/h tangentially fired supercritical pressure boiler,this paper carried out numerical simulation under different load with standard k-ε model.The solid pulverized coal particle flow trajectory in the furnace was also numerically simulated with DPM model.The simulation results show that the jets of four corner burners can form a stable tangential under the different load.The flue gas deflects seriously in furnace that leads to slag of water wall.The eddy appears on the wall under 100% load,and the particles erode furnace wall.The particle residence time in furnace is related to the particle size.The results of the study provide theoretical basis for the adjustment of boiler combustion.
To study the flow characteristics in furnace of a 1139 t/h tangentially fired supercritical pressure boiler,this paper carried out numerical simulation under different load with standard k-ε model.The solid pulverized coal particle flow trajectory in the furnace was also numerically simulated with DPM model.The simulation results show that the jets of four corner burners can form a stable tangential under the different load.The flue gas deflects seriously in furnace that leads to slag of water wall.The eddy appears on the wall under 100% load,and the particles erode furnace wall.The particle residence time in furnace is related to the particle size.The results of the study provide theoretical basis for the adjustment of boiler combustion.
引文
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[10]王为术,常娜娜,刘军,等.350 MW超临界四角切圆锅炉燃烧数值模拟[J].辽宁工程技术大学学报:自然科学版,2014,33(1):99-102.Wang Weishu,Chang Nana,Liu Jun,et al.Study on coal combustion characteristics in a 350MW supercritical tangentially boiler[J].Journal of Liaoning Technical University:Natural Science,2014,33(1):99-102.
[2]张引弟,陈世英,李言钦,等.四角切圆炉内空气动力特性的声学测量试验[J].华中科技大学学报:自然科学版,2009,37(12):83-86.Zhang Yindi,Chen Shiying,Li Yanqin,et al.Testing the aerodynamic characteristics in a tangential boiler by acoustic measurement[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2009,37(12):83-86.
[3]李彦鹏,张强,顾王番,等.二次风反切对大容量切向燃烧锅炉烟气偏差影响的数值研究[J].中国电机工程学报,2001,21(9):33-37.Li Yanpeng,Zhang Qiang,Gu Wangfan,et al.Numerical study on the effect of reverse swirl of secondary air on flue gas imbalance in large tangentially fired boiler[J].Proceedings of the CSEE,2001,21(9):33-37.
[4]姜秀民,崔志刚,马玉峰,等.670t/h四角切圆锅炉反切消旋的数值模拟和工程实践[J].中国电机工程学报,2005,25(18):110-115.Jiang Xiumin,Cui Zhigang,Ma Yufeng,et al.Numerical Simulation and engineering practice of a 670t/h corner tangential boiler with reversretangent and swirling elimination[J].Proceedings of the CSEE,2005,25(18):110-115.
[5]潘维,池作和,斯东波,等.200MW四角切圆燃烧锅炉改造工况数值模拟[J].中国电机工程学报,2005,25(8):110-115.Pan Wei,Chi Zuohe,Si Dongbo,et al.Numerical simulation of combustion processin a 200MW tangentially fired furnace to study furnace reconstruction[J].Proceedings of the CSEE,2005,25(8):110-115.
[6]潘卫国,林泉,孙坚荣,等.一次风喷口速度分布对四角切圆燃烧锅炉炉内空气动力场影响的数值研究[J].动力工程,2004,24(4):495-500.Pan Weiguo,Lin Quan,Sun Jianrong,et al.Numerical Research on the Effect of Velocity Difference Between Le ft and Right Parts of Primary Air Nozzle in the Dynamic Field for a Tangential Firing Boiler[J].Power Engineering,2004,24(4):495-500.
[7]张晋,袁益超,刘聿拯,等.分隔屏布置对四角布置切圆燃烧锅炉水平烟道空气动力场的影响[J].中国电机工程学报,2010,30(17):6-11.Zhang Jin,Yuan Yichao,Liu Yizheng,et al.Influence of the Panel Super heater Layout on Air Dynamic Field in Tangentially Fired Boiler Horizontal Gas Pass[J].Proceedings of the CSEE,2010,30(17):6-11.
[8]白涛,郭永红,孙保民,等.1025 t/h旋流燃烧器煤粉炉降低NOx生成的数值模拟[J].中国电机工程学报,2010,30(29):16-23.Bai Tao,Guo Yonghong,Sun Baoming,et al.Numerical simulation of decreasing NOx emission in a swirling combustion pulverized coal boiler[J].Proceedings of the CSEE,2010,30(29):16-23.
[9]王为术,刘军,王保文,等.超临界锅炉劣质无烟煤燃烧NOX释放特性的数值模拟[J].煤炭学报,2012,37(2):310-315.Wang Weishu,Liu Jun,Wang Baowen,et al.Numerical simulation on the NOX release characteristics during the combustion of poor-quality anthracite in supercritical boiler[J].Journal of China Coal Society,2012,37(2):310-315.
[10]王为术,常娜娜,刘军,等.350 MW超临界四角切圆锅炉燃烧数值模拟[J].辽宁工程技术大学学报:自然科学版,2014,33(1):99-102.Wang Weishu,Chang Nana,Liu Jun,et al.Study on coal combustion characteristics in a 350MW supercritical tangentially boiler[J].Journal of Liaoning Technical University:Natural Science,2014,33(1):99-102.