600MW超临界CFB锅炉炉内稀相区燃烧均匀性的实炉试验研究
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摘要
在一台600MW超临界循环流化床锅炉上进行了炉内稀相区燃烧均匀性的实炉试验研究,测量了不同负荷下一、二次风优化后距布风板25和38m沿炉膛四周的烟气成分分布及炉膛出口的氧量分布。研究表明:给煤分布决定了烟气的主要分布趋势,二次风标高处的炉内烟气成分分布对炉膛出口烟气成分分布有重要影响。当距布风板25m处的炉膛前后墙烟气氧量标准差达到2.8%时,烟气向上流动到距布风板38m处后仍存在1.8%烟气氧量的标准差。在60%至75%的中低负荷时,距布风板25~38m区域内炉膛单位高度(1m)的耗氧量约为0.13%。通过补充试验与回归分析,得到了炉膛稀相区氧量扩散速率的计算关联式。
Field tests were carried out on a 600 MW supercritical circulating fluidized bed(CFB) boiler. The flue gas components at 25 m and 38 m above the air distributors and at the furnace outlets were obtained and analyzed after air optimization. Results imply that the distribution trend of coal gas is determined by the distribution of coal. The distribution of flue gas composition at the secondary air elevation has an important influence on that at the furnace outlets. When the standard deviation of oxygen concentration between the front wall and rear wall at 25 m above the air distributors reaches 2.8%, this value would still be 1.8% when flue gas flowed upward to 38 m above the air distributors. When the boiler run between 60% BMCR and 75% BMCR, the oxygen consumption per unit height(1 m) is about 0.13% in the region from 25 m to 38 m above the air distributor. Through the supplementary test and the regression analysis, the correlation formula for the oxygen diffusion rate in the dilute phase of the furnace is obtained.
Field tests were carried out on a 600 MW supercritical circulating fluidized bed(CFB) boiler. The flue gas components at 25 m and 38 m above the air distributors and at the furnace outlets were obtained and analyzed after air optimization. Results imply that the distribution trend of coal gas is determined by the distribution of coal. The distribution of flue gas composition at the secondary air elevation has an important influence on that at the furnace outlets. When the standard deviation of oxygen concentration between the front wall and rear wall at 25 m above the air distributors reaches 2.8%, this value would still be 1.8% when flue gas flowed upward to 38 m above the air distributors. When the boiler run between 60% BMCR and 75% BMCR, the oxygen consumption per unit height(1 m) is about 0.13% in the region from 25 m to 38 m above the air distributor. Through the supplementary test and the regression analysis, the correlation formula for the oxygen diffusion rate in the dilute phase of the furnace is obtained.
引文
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[26]王正阳,秦明,孙绍增,等.二次风分布对CFB锅炉炉内气固混合及燃烧的影响[J].热能动力工程,2009,24(2):205-210.Wang Zhengyang,Qin Ming,Sun Shaozeng,et al.Influence of secondary air distribution on the gas-solid combustion condition in a CFB(circulating fluidized bed)boiler furnace[J].Journal of Engineering for Thermal Energy and Power,2009,24(2):205-210(in Chinese).
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[28]Yan Jin,Lu Xiaofeng,Wang Quanhai,et al.Experimental and numerical study on air flow uniformity in the isobaric windbox of a 600MW supercritical CFB boiler[J].Applied Thermal Engineering,2017,122:311-321.
[29]周金良,王泉海,严谨,等.白马600MW超临界CFB锅炉二次风系统均匀性试验与数值模拟[J].Zhou Jinliang,Wang Quanhai,Yan Jin,et al.Experimental and numerical simulation on the uniformity of secondary air system of baima 600MW supercritical CFB boiler[J](in Chinese)(in Press).
[30]雷秀坚,严谨,谢雄,等.600MW CFB锅炉风煤均匀性优化试验研究[J].电站系统工程,2016(6):5-8.Lei Xiujian,Yan Jin,Xie Xiong,et al.Experimental study on optimization of 600MW CFB boiler operation[J].Power System Engineering,2016(6):5-8(in Chinese).
[31]金晓钟,吕俊复,乔锐,等.循环床锅炉燃烧份额分布的实验研究和理论分析[J].洁净煤技术,1999,5(1):26-29.Jin Xiaozhong,LüJunfu,Qiao Rui,et al.Experimental study and theory analysis on coal combustion fraction distribution in circulating fluidized bed combustor[J].Clean Coal Technology,1999,5(1):26-29(in Chinese).
[2]卢啸风.大型循环流化床锅炉设备与运行[M].北京:中国电力出版社,2006.Lu Xiaofeng.Equipments and operation of large-scale circulating fluidized bed boiler[M].Beijing:China Electric Power Press,2006(in Chinese).
[3]Yue G X,Yang H R,Lu J F,et al.Latest development of CFB boilers in China[C]//Proceedings of the 20th International Conference on Fluidized Bed Combustion.Berlin Heidelberg:Springer-Verlag,2010:3-12.
[4]岑可法,倪明江,骆仲泱,等.循环流化床锅炉理论设计与运行[M].北京:中国电力出版社,1998.Cen Kefa,Ni Mingjiang,Luo Zhongyang,et al.Theoretical design and operation of circulating fluidized bed boiler[M].Beijing:China Electric Power Press,1998(in Chinese).
[5]吕俊复,于龙,张彦军,等.600MW超临界循环流化床锅炉[J].动力工程,2007,27(4):497-501,587.LüJunfu,Yu Long,Zhang Yanjun,et al.A 600MWsupercritical circulating fluidized bed boiler[J].Journal of Power Engineering,2007,27(4):497-501,587(in Chinese).
[6]王虎,卢啸风,王泉海,等.600MW超临界CFB锅炉运行特性分析[C]//中国工程热物理学会-2013年燃烧学学术会议暨国家自然科学基金燃烧项目进展交流会.重庆:重庆大学,2013.Wang Hu,Lu Xiaofeng,Wang Quanhai,et al.The Operational characteristics of 600MW supercritical CFBboiler[C]//Combustion Branch of Chinese Society of Engineering Thermophysics and Progress Meeting on Combustion of National Natural Science Fund.Chongqing:Chongqing University,2013(in Chinese).
[7]胡昌华,卢啸风.600MW超临界循环流化床锅炉设备与运行[M].北京:中国电力出版社,2012.Hu Changhua,Lu Xiaofeng.Equipments and operation of the 600MW supercritical circulating fluidized bed boiler[M].Beijing:China Electric Power Press,2012(in Chinese).
[8]雷秀坚.世界首台600MW超临界CFB锅炉调试中故障分析及治理[J].神华科技,2015,13(4):42-45.Lei Xiujian.Analysis and control of equipment failure during commissioning of the World's first 600MWsupercritical CFB boiler[J].Shen Hua Science and Technology,2015,13(4):42-45(in Chinese).
[9]莫鑫,蔡润夏,吕俊复,等.基于返料灰温偏差的600MW(e)循环流化床锅炉内气固不均匀分布[J].中国电机工程学报,2016,36(8):2175-2180.Mo Xin,Cai Runxia,LüJunfu,et al.Analysis of non-uniform distribution of gas-solid flow in the600MW(e)CFB boiler based on the non-uniform distribution of returning ash temperature[J].Proceedings of the CSEE,2016,36(8):2175-2180(in Chinese).
[10]廖磊,那永洁,吕清刚,等.六个旋风分离器并联布置循环流化床的实验研究[J].中国电机工程学报,2011,31(11):11-16.Liao Lei,Na Yongjie,LüQinggang,et al.Experimental study on a circulating fluidized bed with six cyclone separators[J].Proceedings of the CSEE,2011,31(11):11-16(in Chinese).
[11]Zhou Xinglong,Cheng Leming,Wang Qinhui,et al.Non-uniform distribution of gas-solid flow through six parallel cyclones in a CFB system:an experimental study[J].Particuology,2012,10(2):170-175.
[12]王虎.大型循环流化床锅炉物料平衡与热平衡特性实炉对比研究[D].重庆:重庆大学,2015.Wang Hu.Comparative study on particle population balance and heat balance in large-scale circulating fluidized bed boilers[D].Chongqing:Chongqing University,2015(in Chinese).
[13]杨海瑞,吕俊复,刘青,等.循环流化床锅炉密相区内颗粒的横向扩散研究[J].热能动力工程,2001,16(4):395-398.Yang Hairui,LüJunfu,Liu Qing,et al.A study of the transverse dispersion of solid particles in the dense-phase zone of a circulating fluidized bed boiler[J].Journal of Engineering for Thermal Energy and Power,2001,16(4):395-398(in Chinese).
[14]Liu Daoyin,Chen Xiaoping.Lateral solids dispersion coefficient in large-scale fluidized beds[J].Combustion and Flame,2010,157(11):2116-2124.
[15]刘道银,陈晓平,唐智,等.侧面进料在循环流化床密相区混合特性的试验研究[J].工程热物理学报,2009,30(3):529-532.Liu Daoyin,Chen Xiaoping,Tang Zhi,et al.Experimental study on the mixing of particles feeding into the bottom zone of a CFB[J].Journal of Engineering Thermophysics,2009,30(3):529-532(in Chinese).
[16]Breault R W.A review of gas-solid dispersion and mass transfer coefficient correlations in circulating fluidized beds[J].Powder Technology,2006,163(1-2):9-17.
[17]胡南,郭兆君,杨海瑞,等.CFB锅炉炉膛内颗粒横向扩散系数研究[J].动力工程学报,2016,36(3):168-171,206.Hu Nan,Guo Zhaojun,Yang Hairui,et al.Experimental study on lateral dispersion coefficient of solid particles in a CFB boiler[J].Journal of Chinese Society of Power Engineering,2016,36(3):168-171,206(in Chinese).
[18]肖显斌,杨海瑞,吕俊复,等.CFB密相区内颗粒横向扩散对燃烧的影响[J].煤炭转化,2003,26(4):55-59.Xiao Xianbin,Yang Hairui,LüJunfu,et al.Effect of the solid lateral dispersion in the dense zone of CFB[J].Coal Conversion,2003,26(4):55-59(in Chinese).
[19]刘道银.流化床内颗粒混合的实验和数值模拟研究[D].南京:东南大学,2011.Liu Daoyin.Experimental and numerical simulation of particle mixing in fluidized bed[D].Nanjing:Southeast University,2011(in Chinese).
[20]李金晶,龚鹏,吕俊复,等.给煤对大型CFB锅炉床温均匀性的影响[J].热能动力工程,2012,27(1):76-80.Li Jinjing,Gong Peng,LüJunfu,et al.Influence of the coal feed on the bed temperature uniformity of a large-sizd CFB boiler[J].Journal of Engineering for Thermal Energy and Power,2012,27(1):76-80(in Chinese).
[21]Farid M M,Jeong H J,Kim K H,et al.Numerical investigation of particle transport hydrodynamics and coal combustion in an industrial-scale circulating fluidized bed combustor:effects of coal feeder positions and coal feeding rates[J].Fuel,2017,192:187-200.
[22]苗俊明,彭顺刚,谢昂均,等.1069t/h大型循环流化床床温偏差原因分析与改造[J].电力科学与工程,2015,31(5):46-52.Miao Junming,Peng Shungang,Xie Angjun,et al.Cause analysis and reconstruction for the temperature deviation in 1069 t/h large-scale domestic CFB boiler[J].Electric Power Science and Engineering,2015,31(5):46-52(in Chinese).
[23]马辉,彭顺刚,陈袁,等.300MW流化床锅炉布风方式对床温偏差影响的模拟研究[J].节能,2015,34(5):10-15.Ma Hui,Peng Shungang,Chen Yuan,et al.Simulation research for the impact of air supply mood on bed temperature deviation in 300MW CFB boiler[J].Energy Conservation,2015,34(5):10-15(in Chinese).
[24]王海刚,包绍麟,那永洁,等.超临界循环流化床锅炉进风系统数值模拟分析与比较[J].工程热物理学报,2011,32(10):1772-1776.Wang Haigang,Bao Shaolin,Na Yongjie,et al.CFDsimulation and analysis for the air flow in the primary air chamber of a supper-critical circulating fluidized bed[J].Journal of Engineering Thermophysics,2011,32(10):1772-1776(in Chinese).
[25]许秀启.135MW循环流化床锅炉一次风室数值模拟与改造措施[D].上海:上海交通大学,2013.Xu Xiuqi.Numerical simulation and rebuild of primaryair chamber on 135MW class circulating fluidized bed boiler[D].Shanghai:Shanghai Jiao Tong University,2013(in Chinese).
[26]王正阳,秦明,孙绍增,等.二次风分布对CFB锅炉炉内气固混合及燃烧的影响[J].热能动力工程,2009,24(2):205-210.Wang Zhengyang,Qin Ming,Sun Shaozeng,et al.Influence of secondary air distribution on the gas-solid combustion condition in a CFB(circulating fluidized bed)boiler furnace[J].Journal of Engineering for Thermal Energy and Power,2009,24(2):205-210(in Chinese).
[27]Glicksman L R.Scaling relationships for fluidized beds[J].Chemical Engineering Science,1984,39(9):1373-1379.
[28]Yan Jin,Lu Xiaofeng,Wang Quanhai,et al.Experimental and numerical study on air flow uniformity in the isobaric windbox of a 600MW supercritical CFB boiler[J].Applied Thermal Engineering,2017,122:311-321.
[29]周金良,王泉海,严谨,等.白马600MW超临界CFB锅炉二次风系统均匀性试验与数值模拟[J].Zhou Jinliang,Wang Quanhai,Yan Jin,et al.Experimental and numerical simulation on the uniformity of secondary air system of baima 600MW supercritical CFB boiler[J](in Chinese)(in Press).
[30]雷秀坚,严谨,谢雄,等.600MW CFB锅炉风煤均匀性优化试验研究[J].电站系统工程,2016(6):5-8.Lei Xiujian,Yan Jin,Xie Xiong,et al.Experimental study on optimization of 600MW CFB boiler operation[J].Power System Engineering,2016(6):5-8(in Chinese).
[31]金晓钟,吕俊复,乔锐,等.循环床锅炉燃烧份额分布的实验研究和理论分析[J].洁净煤技术,1999,5(1):26-29.Jin Xiaozhong,LüJunfu,Qiao Rui,et al.Experimental study and theory analysis on coal combustion fraction distribution in circulating fluidized bed combustor[J].Clean Coal Technology,1999,5(1):26-29(in Chinese).