W火焰锅炉无烟煤煤粉气流着火特性
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摘要
针对采用缝隙式燃烧器的600 MW超临界W火焰锅炉进行了热态试验研究,着重考察了不同工况下无烟煤煤粉气流的着火特性。试验结果表明,煤粉气流着火特性受燃烧器配风和煤粉浓度影响较为敏感。较低的一次风速可以显著缩短浓相煤粉气流着火距离,在1 m左右可以稳定的着火;二次风应在煤粉气流着火后补入,过大或过小的二次风均容易引起燃烧恶化;无烟煤煤粉气流的燃烧宜采用较高的煤粉浓度,煤粉浓度提高至1.0 kg/kg后浓相煤粉气流的着火更加稳定。控制合适的煤粉气流着火距离对W火焰锅炉运行非常重要,着火延迟距离过大后会引起火焰中心的下移从而容易造成冷灰斗区域的温度过高。
Experimental studies were conducted on the anthracite ignition characteristics under different conditions in a600 MW supercritical arch-fired boiler equipped with slot burners. The experimental measurements reveal that the ignition distance of the pulverized coal flows is affected by the air distribution of the burner and pulverized coal concentration. The ignition distance of the fuel-rich flows become remarkably shorter under the low primary velocity. The fuelrich flows could be ignited at about 1 meter away from the burner. The secondary air should be added into the primary flows after being ignited and it is ease for the excess or deficiency of secondary air to cause the deterioration of combustion. A higher concentration of pulverized coal is favorable for anthracite ignition. Ignition of the fuel-rich flows become more stable after rising the concentration of pulverized coal to 1. 0 kg / kg. Appropriate ignition distance of pulverized coal flows is very important to the operation of arch-fired boilers. The delayed ignition distance of pulverized coal could lower the flame center and cause the high temperature of the hopper region.
Experimental studies were conducted on the anthracite ignition characteristics under different conditions in a600 MW supercritical arch-fired boiler equipped with slot burners. The experimental measurements reveal that the ignition distance of the pulverized coal flows is affected by the air distribution of the burner and pulverized coal concentration. The ignition distance of the fuel-rich flows become remarkably shorter under the low primary velocity. The fuelrich flows could be ignited at about 1 meter away from the burner. The secondary air should be added into the primary flows after being ignited and it is ease for the excess or deficiency of secondary air to cause the deterioration of combustion. A higher concentration of pulverized coal is favorable for anthracite ignition. Ignition of the fuel-rich flows become more stable after rising the concentration of pulverized coal to 1. 0 kg / kg. Appropriate ignition distance of pulverized coal flows is very important to the operation of arch-fired boilers. The delayed ignition distance of pulverized coal could lower the flame center and cause the high temperature of the hopper region.
引文
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[15]王春昌.缝隙式燃烧器“W”火焰锅炉的燃烧稳定性[J].中国电力,2009,42(1):58-61.Wang Chunchang.Split burner and the combustion stability of Wflame boiler[J].China Power,2009,42(1):58-61.
[16]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):13-17.Miao Changxin,Che Gang,Liu Zhichao.Combustion adjustment and operation charateristics analysis of 300 MW“W”flame boilers in Heze Power Plant[J].China Power,2002,35(7):13-17.
[17]阎维平,徐通模,许晋源.煤粉气流着火存在最佳煤粉浓度的机理分析[J].华北大力学院学报,1995,22(2):28-32.Yan Weiping,Xu Tongmo,Xu Jinyuan.Mechanism analysis for optimal pulverised-coal concentration in ignition of primary air stream[J].Journal of North China Institute of Science and Technology,1995,22(2):28-32.
[2]张海,吕俊复,岳光溪,等.若干煤粉燃烧的设计思想分析[J].锅炉技术,2007,38(6):36-41.Zhang Hai,LüJunfu,Yue Guangxi,et al.On design analysis for pulverized coal burners[J].Boiler Technology,2007,38(6):36-41.
[3]Fan Weidong,Lin Zhengchong,Li Youyi,et al.Effect of air-staging on anthracite combustion and NOxformation[J].Energy&Fuels,2009,23(1):2437-2443.
[4]徐通模,惠世恩.燃烧学[M].北京:机械工业出版社,2011.Xu Tongmo,Hui Shien.Combustion theory[M].Beijing:China Machine Press,2011.
[5]闫顺林,陈华刚,董标,等.劣质煤稳定燃烧的“三高一强”原则分析[J].锅炉技术,2012,43(5):46-49.Yan Shunlin,Chen Huagang,Dong Biao,et al.“Three High One Strong”principle analysis of inferior coal stable combustion[J].Boiler Technology,2012,43(5):46-49.
[6]Cui Kai,Liu Bing,Zhang Hai,et al.Modeling of pulverized coal combustion in turbulent flow with the consideration of intermediate reaction of volatile mater[J].Energy&Fuels,2013,27(4):2246-2254.
[7]张海,吕俊复,徐秀清,等.W型火焰锅炉燃烧问题的分析和解决方法[J].动力工程,2005,25(5):628-632.Zhang Hai,LüJunfu,Xu Xiuqing,et al.Analysis and possible solutions for the combustion problems of boilers with arc-firing[J].Journal of Power Engineering,2005,25(5):628-632.
[8]方庆艳,周怀春,汪华剑,等.W火焰锅炉结渣特性数值模拟[J].中国电机工程学报,2008,28(33):1-6.Fang Qingyan,Zhou Huaichun,Wang Huajian,et al.Numerical simulation of the ash deposition characteristics in a W-flame bolier[J].Proceedings of the CSEE,2008,28(33):1-6.
[9]Kuang Min,Li Zhengqi,Liu Chunlong,et al.Overall evaluation of combustion and NOxemissions for a down-fired 600 MW supercritical boiler with multiple injection and multiple staging[J].Environmental Science&Technology,2013,47(9):4850-4858.
[10]王为术,刘军,王保文,等.600 MW超临界W火焰锅炉无烟煤燃烧NOx释放规律研究[J].煤炭学报,2011,36(6):993-998.Wang Weishu,Liu Jun,Wang Baowen,et al.Study on the NOx emission during the combustion of anthracite coal in 600 MW supercritical pressure W-flame boiler[J].Journal of China Coal Society,2011,36(6):993-998.
[11]周文台,程智海,金鑫,等.600 MW超临界W火焰锅炉防超温燃烧调整试验研究[J].动力工程学报,2013,33(10):753-758.Zhou Wentai,Cheng Zhihai,Jin Xin,et al.Combustion adjustment test of preventing overheating problems in a 600 MW supercritical W-flame boiler[J].Journal of Chinese Society of Power Engineering,2013,33(10):753-758.
[12]周武,陈建梅,陈灿,等.超临界W火焰锅炉炉内过程数值模拟[J].东方电气评论,2010(2):13-16.Zhou Wu,Chen Jianmei,Chen Can,et al.Numerical simulation of flow and combustion process in the furnace of supercritical W-flame pulverized coal boiler[J].Dongfang Electric Review,2010(2):13-16.
[13]Li Zhengqi,Ren Feng,Chen Zhichao,et al.Influence of declivitous secondary air on combustion characteristics of a down-fired 300-MWe utility boiler[J].Fuel,2010,89:410-416.
[14]高正阳,孙小柱,宋玮,等.W火焰锅炉结构效应对火焰影响的数值模拟[J].中国电机工程学报,2009,29(29):13-18.Gao Zhengyang,Sun Xiaozhu,Song Wei,et al.Numerical Simulation on the effect of structure on flame for W flame boiler[J].Proceedings of the CSEE,2009,29(29):13-18.
[15]王春昌.缝隙式燃烧器“W”火焰锅炉的燃烧稳定性[J].中国电力,2009,42(1):58-61.Wang Chunchang.Split burner and the combustion stability of Wflame boiler[J].China Power,2009,42(1):58-61.
[16]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):13-17.Miao Changxin,Che Gang,Liu Zhichao.Combustion adjustment and operation charateristics analysis of 300 MW“W”flame boilers in Heze Power Plant[J].China Power,2002,35(7):13-17.
[17]阎维平,徐通模,许晋源.煤粉气流着火存在最佳煤粉浓度的机理分析[J].华北大力学院学报,1995,22(2):28-32.Yan Weiping,Xu Tongmo,Xu Jinyuan.Mechanism analysis for optimal pulverised-coal concentration in ignition of primary air stream[J].Journal of North China Institute of Science and Technology,1995,22(2):28-32.