采用旋风分离的狭缝燃烧器风量分配特性研究
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摘要
本文以两台采用旋风筒浓淡分离器的W火焰锅炉狭缝式直流燃烧器为研究对象,在冷态下测量了炉内喷口的风速,发现喷口间风速存在规律性偏差。对其中一台进行冷态数值模拟计算研究,验证了喷口风量分配偏差的现象,确定风速偏差产生是由旋风分离器带来的旋流和燃烧器结构共同导致的。在热态下测量燃烧器不同喷口的着火距离,发现同一燃烧器不同喷口间着火距离有很大不同,说明风量偏差对锅炉燃烧有明显影响。
In this paper, two slit type impellerless burners of W-flame boiler using cyclone separator were studied.The wind velocity of nozzles was measured under cold conditions, and the regular deviation of wind velocity between different nozzles was found. And the numerical simulation was conducted for one of the objects on air flow, the result shows that the phenomenon of air volume deviation was caused by both the cyclone and the burner structure. The ignition distance of different nozzles in hot condition was measured. It was found that the deviation of fire distance between different nozzles of a burner is very large, which shows that the deviation of air volume has obvious influence on boiler combustion.
In this paper, two slit type impellerless burners of W-flame boiler using cyclone separator were studied.The wind velocity of nozzles was measured under cold conditions, and the regular deviation of wind velocity between different nozzles was found. And the numerical simulation was conducted for one of the objects on air flow, the result shows that the phenomenon of air volume deviation was caused by both the cyclone and the burner structure. The ignition distance of different nozzles in hot condition was measured. It was found that the deviation of fire distance between different nozzles of a burner is very large, which shows that the deviation of air volume has obvious influence on boiler combustion.
引文
[1]毕玉森,陈国辉.低挥发分煤种与W型火焰锅炉[J].热力发电,2005, 34(7):7-10BI Yusen, CHEN Guohui. Low Volatile Coal and W Flame Boiler[J]. Thermal Power Generation, 2005, 34(7):7-10
[2]许传凯.低挥发分煤的燃烧与“W”型火焰锅炉若干问题研究[J].中国电力,2004, 37(7):37-40Xu Chuankai. Several Problems with the Combustion of Low-volatile Coal and W-flame Boiler[J]. Electric Power,2004, 37(7):37-40
[3]王春昌.缝隙式燃烧器与“W”火焰锅炉的燃烧稳定性[J].中国电力,2009, 42(1):58-61Wang Chunchang, Split burner and the Combustion Stability of W-flame Boiler[J]. China Power, 2009, 42(1):58-61
[4] Dietz P W. Collection Efficiency of Cyclone Separators[J].Aiche Journal, 1981, 27(6):888-892
[5] Hoekstra A J. Gas Flow Field and Collection Efficiency of Cyclone Separators[J]. Applied Sciences, 2000
[6] Rafiee S E, Sadeghiazad M M. Efficiency Evaluation of Vortex Tube Cyclone Separator[J]. Applied Thermal Engineering, 2016, 114:300-327
[7] Ma L, Fang Q, Tan P, et al. Effect of the Separated Overfire Air Location on the Combustion Optimization and NO_x, Reduction of a 600 MWe, FW Down-fired Utility Boiler with a Novel Combustion System[J]. Applied Energy, 2016, 180:104-115
[8] Eberle J S, Garcia-Mallol J A, Simmerman R N. Advanced FW Arch Firing:NOx Reduction in Central Power Station[C]//Pittsburgh Coal Conference, Pittsburgh, USA,2002
[9] Garcia-Mallol J A, Morristown N J, Over-Fire Air Control System for a Pulverized Solid Fuel Furnace:USA Patent:No.5727480[P]. 1998-03-17
[10]陈玉忠,石践,罗小鹏.缝隙式燃烧器“W”火焰锅炉燃烧系统改造后燃烧调整及运行特性分析[J].中国电机工程学报,2011, 31(s1):212-216CHEN Yuzhong, SHI Jian, LU Xiaopeng. Combustion Adjustment and Operation Characteristics for W Flame Boiler with Split-burner After Combustion System Retrofitted[J]. Proceedings of The Chinese Society for Electrical Engineering, 2011, 31(s1):212-216
[11]苗长信,车刚,刘志超.菏泽发电厂300 MW “W”火焰锅炉燃烧调整及运行特性分析[J].中国电力,2002, 35(7):13-17MIAO Changxin, CHE Gang, LIU Zhichao. Combustion Adjustment and Operation Charateristics Analysis of 300MW“W” Flame Boilers in Heze. Power Plant[J]. China Power, 2002, 35(7):13-17
[12]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004:205-206WANG Fujun. Computational Fluid Dynamics Analysis[M].Beijing:Tsinghua University Press, 2004:205-206
[13] Oh J, Choi S, Kim J. Numerical Simulation of an Internal Flow Field in a Uniflow Cyclone Separator[J]. Powder Technology, 2015, 274:135-145
[14] Hamdy O, Bassily M A, El-Batsh H M, et al. Numerical Study of the Effect of Changing the Cyclone Cone Length on the Gas Flow Field[J]. Applied Mathematical Modelling, 2017, 46:81-97
[15]高佳佳,刘鹏远,徐鹏志,等.基于DBEL技术超临界“W”火焰锅炉狭缝式燃烧器煤粉着火燃烧特性研究[J].热能动力工程,2015, 30(5):768-774GAO Jiajia, LIU Pengyuan, XU Pengzhi, et al. Study on Ignition and Combustion Characteristics of Pulverized Coal in a Supercritical W-flame Boiler with type Burner Based on DBEL Technology[J]. Journal of Engineering for Thermal Energy and Power, 2015, 30(5):768-774
[16] Ren F, Li Z, Chen Z, et al. Experimental Investigations into Gas/Particle Flows in a Down-Fired Boiler:Influence of Secondary Air Momentum[J]. Energy&Fuels, 2010,24(6):3498-3509
[17]刘鹏远,张海,申浩树,等.W火焰锅炉无烟煤煤粉气流着火特性[J].煤炭学报,2016, 41(10):2466-2472LIU Pengyuan, ZHANG Hai, SHEN Haoshu, et al. Anthracite Ignition Characteristics in an Arch Fired Boiler With Slot Burners[J]. Journal of China Coal Society,2016, 41(10):2466-2472
[18]刘鹏远,张大龙,张海,等.缝隙式喷口600MW超临界W火焰锅炉改造前后燃烧特性的试验与数值计算研究[J].中国电机工程学报,2017, 37(2):606-613LIU Pengyuan,ZHANG Dalong, ZHANG Hai, et al. Experimental and Numerical Studies on Gombustion Characteristics of a 600 MW Supercritical Arch-fired Boiler Equipped with Slot Burners Before and After Eetrofit[J].Proceedings of The Chinese Society for Electrical Engineering, 2017, 37(2):606-613
[2]许传凯.低挥发分煤的燃烧与“W”型火焰锅炉若干问题研究[J].中国电力,2004, 37(7):37-40Xu Chuankai. Several Problems with the Combustion of Low-volatile Coal and W-flame Boiler[J]. Electric Power,2004, 37(7):37-40
[3]王春昌.缝隙式燃烧器与“W”火焰锅炉的燃烧稳定性[J].中国电力,2009, 42(1):58-61Wang Chunchang, Split burner and the Combustion Stability of W-flame Boiler[J]. China Power, 2009, 42(1):58-61
[4] Dietz P W. Collection Efficiency of Cyclone Separators[J].Aiche Journal, 1981, 27(6):888-892
[5] Hoekstra A J. Gas Flow Field and Collection Efficiency of Cyclone Separators[J]. Applied Sciences, 2000
[6] Rafiee S E, Sadeghiazad M M. Efficiency Evaluation of Vortex Tube Cyclone Separator[J]. Applied Thermal Engineering, 2016, 114:300-327
[7] Ma L, Fang Q, Tan P, et al. Effect of the Separated Overfire Air Location on the Combustion Optimization and NO_x, Reduction of a 600 MWe, FW Down-fired Utility Boiler with a Novel Combustion System[J]. Applied Energy, 2016, 180:104-115
[8] Eberle J S, Garcia-Mallol J A, Simmerman R N. Advanced FW Arch Firing:NOx Reduction in Central Power Station[C]//Pittsburgh Coal Conference, Pittsburgh, USA,2002
[9] Garcia-Mallol J A, Morristown N J, Over-Fire Air Control System for a Pulverized Solid Fuel Furnace:USA Patent:No.5727480[P]. 1998-03-17
[10]陈玉忠,石践,罗小鹏.缝隙式燃烧器“W”火焰锅炉燃烧系统改造后燃烧调整及运行特性分析[J].中国电机工程学报,2011, 31(s1):212-216CHEN Yuzhong, SHI Jian, LU Xiaopeng. Combustion Adjustment and Operation Characteristics for W Flame Boiler with Split-burner After Combustion System Retrofitted[J]. Proceedings of The Chinese Society for Electrical Engineering, 2011, 31(s1):212-216
[11]苗长信,车刚,刘志超.菏泽发电厂300 MW “W”火焰锅炉燃烧调整及运行特性分析[J].中国电力,2002, 35(7):13-17MIAO Changxin, CHE Gang, LIU Zhichao. Combustion Adjustment and Operation Charateristics Analysis of 300MW“W” Flame Boilers in Heze. Power Plant[J]. China Power, 2002, 35(7):13-17
[12]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004:205-206WANG Fujun. Computational Fluid Dynamics Analysis[M].Beijing:Tsinghua University Press, 2004:205-206
[13] Oh J, Choi S, Kim J. Numerical Simulation of an Internal Flow Field in a Uniflow Cyclone Separator[J]. Powder Technology, 2015, 274:135-145
[14] Hamdy O, Bassily M A, El-Batsh H M, et al. Numerical Study of the Effect of Changing the Cyclone Cone Length on the Gas Flow Field[J]. Applied Mathematical Modelling, 2017, 46:81-97
[15]高佳佳,刘鹏远,徐鹏志,等.基于DBEL技术超临界“W”火焰锅炉狭缝式燃烧器煤粉着火燃烧特性研究[J].热能动力工程,2015, 30(5):768-774GAO Jiajia, LIU Pengyuan, XU Pengzhi, et al. Study on Ignition and Combustion Characteristics of Pulverized Coal in a Supercritical W-flame Boiler with type Burner Based on DBEL Technology[J]. Journal of Engineering for Thermal Energy and Power, 2015, 30(5):768-774
[16] Ren F, Li Z, Chen Z, et al. Experimental Investigations into Gas/Particle Flows in a Down-Fired Boiler:Influence of Secondary Air Momentum[J]. Energy&Fuels, 2010,24(6):3498-3509
[17]刘鹏远,张海,申浩树,等.W火焰锅炉无烟煤煤粉气流着火特性[J].煤炭学报,2016, 41(10):2466-2472LIU Pengyuan, ZHANG Hai, SHEN Haoshu, et al. Anthracite Ignition Characteristics in an Arch Fired Boiler With Slot Burners[J]. Journal of China Coal Society,2016, 41(10):2466-2472
[18]刘鹏远,张大龙,张海,等.缝隙式喷口600MW超临界W火焰锅炉改造前后燃烧特性的试验与数值计算研究[J].中国电机工程学报,2017, 37(2):606-613LIU Pengyuan,ZHANG Dalong, ZHANG Hai, et al. Experimental and Numerical Studies on Gombustion Characteristics of a 600 MW Supercritical Arch-fired Boiler Equipped with Slot Burners Before and After Eetrofit[J].Proceedings of The Chinese Society for Electrical Engineering, 2017, 37(2):606-613