建立了花瓣形旋流燃烧器的物理模型,采用Fluent软件对不同内二次风切向速度下花瓣形旋流燃烧器出口的流场进行了数值模拟,分析了其回流区特性,并与冷态下的试验结果进行比较.结果表明:花瓣形旋流燃烧器能在瓣峰后形成轴向和径向回流区,径向的对流换热能起到很好的稳燃效果,提高了对低品质煤种的适应性;在一定范围内,切向速度越大,轴向回流区形成越快,但过大的切向速度会使径向回流区的面积减小.
Abstract
Based on physical models set up for a petal-shaped swirl burner, numerical simulations were performed to the outlet flow field using Fluent software at different tangential velocities of inner secondary air, so as to analyze the characteristics of the recirculation zone and compare the simulation results with cold-state experimental data. Results show that the petal-shaped swirl burner is able to form both axial and radial recirculation zones in the valley behind petal peak, where the radial convective heat transfer has a good effect on combustion stabilization, thus improving its adaptability to low-quality coal; within a certain range, the greater the tangential velocity is, the faster the axial recirculation zone will be formed, but too high tangential velocity will lead to the reduction of radial recirculation zone.
关键词
花瓣形旋流燃烧器 /
稳燃 /
回流区 /
出口流场 /
数值模拟
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Key words
petal-shaped swirl burner /
combustion stabilization /
recirculation zone /
outlet flow field /
numerical simulation
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参考文献
[1] 胡景生.电网经济运行与能源标准化[M]. 北京:中国标准出版社, 2001:69-71.
[2] 狄万丰, 韩继伟, 杨忠灿, 等. 超临界 600 MW 机组褐煤锅炉的运行特性研究[J]. 热力发电, 2011,40(4): 62-65.
DI Wanfeng, HAN Jiwei, YANG Zhongcan, et al. Study on operation characters of lignite coal fired boiler equipped for supercritical 600 MW unit[J]. Thermal Power Generation, 2011, 40(4): 62-65.
[3] 樊泉桂,阎维平,闫顺林,等.锅炉原理[M].北京:中国电力出版社,2008:101-114.
[4] 林正春,范卫东,李友谊,等.一种低NOx旋流燃烧器流场特性的研究[J]. 动力工程, 2008, 28 (3):355-360.
LIN Zhengchun, FAN Weidong, LI Youyi, et al. Experimental research on aerodynamic field characteristic of a low NOx swirl burner[J]. Journal of Power Engineering, 2008, 28(3):355-360.
[5] 刘建华, 齐桐悦. 煤粉锅炉旋流燃烧器壁温特性的研究[J]. 华北电力技术, 2005,35(3): 9-11.
LIU Jianhua, QI Tongyue. Study on wall temperature characteristics of swirling burner in pulverized-fuel boiler[J]. North China Electric Power, 2005,35(3): 9-11.
[6] 申春梅, 孙锐, 吴少华. 1 GW单炉膛双切圆炉内煤粉燃烧过程的数值模拟[J]. 中国电机工程学报, 2006, 26(15): 51-57.
SHEN Chunmei, SUN Rui, WU Shaohua. Numerical simulation of pulverized coal combustion in a 1 GW dual circle tangential firing single chamber boiler[J]. Proceedings of the CSEE, 2006, 26(15): 51-57.
[7] 洪荣坤, 沈跃良, 赵振峰. 600 MW超临界对冲燃烧锅炉 CO和NOx排放特性的研究[J]. 动力工程学报, 2012, 32(12): 922-927.
HONG Rongkun, SHEN Yueliang, ZHAO Zhenfeng. Emission characteristics of CO and NOx from opposed firing boiler in a 600 MW supercritical unit[J]. Journal of Chinese Society of Power Engineering, 2012, 32(12): 922-927.
[8] 赵晓光, 孙建磊, 高欣. 一起锅炉制粉系统爆燃的事故原因分析[J]. 电力安全技术, 2013(11): 32-33.
ZHAO Xiaoguang, SUN Jianlei, GAO Xin. Analysis of the cause of the accident of boiler pulverizing system explosion[J]. Electric Safety Technology, 2013(11): 32-33.
[9] 高小涛, 黄磊, 张恩先, 等. 600 MW 前后墙布置燃烧器锅炉的NOx排放特性及其影响因素的分析[J]. 动力工程, 2009, 29(9): 806-812.
GAO Xiaotao, HUANG Lei, ZHANG Enxian, et al. NOx emission and influence factors of 600 MW boilers with burners arranged in front and back walls[J]. Journal of Power Engineering, 2009, 29(9): 806-812.
[10] 赵伶伶,周强泰.复杂曲面花瓣燃烧器煤粉燃烧数值分析[J]. 中国电机工程学报, 2007, 27(5): 39-43.
ZHAO Lingling, ZHOU Qiangtai. Numerical analysis of the petal swirl burner with complex geometry configuration for pulverized coal[J]. Proceedings of the CSEE, 2007, 27(5): 39-43.
[11] 赵伶伶,周强泰,赵长遂.煤粉旋流燃烧器掺混系数的研究与分析[J].中国电机工程学报,2006,26(23):95-99.
ZHAO Lingling, ZHOU Qiangtai, ZHAO Changsui. Study on mixed coefficient of pulverized coal swirl burner[J]. Proeeedings of the CSEE, 2006, 26(23):95-99.
[12] 赵伶伶,周强泰,赵长遂.花瓣稳燃器流场的数值模拟与特性分析[J].热能动力工程,2006,21(3):264-267.
ZHAO Lingling, ZHOU Qiangtai, ZHAO Changsui. Numerical simulation and characteristic analysis of the flow fields in a petal shaped combustion stabilizer[J]. Journal of Engineering for Thermal Energy and Power, 2006,21(3):264-267.
[13] 王瑞金,张凯,王刚. FLUENT技术基础与应用实例[M].北京:清华大学出版社,2007.
[14] 新元. 电站锅炉运行与燃烧调整[M]. 北京:中国电力出版社, 2003.
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