600MW CFB锅炉气固流动均匀性数值模拟与试验研究
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摘要
在实炉试验测量数据的基础上,采用欧拉-拉格朗日模型模拟研究600MW超临界循环流化床锅炉在不同负荷、不同二次风分布状态下的气固流动分布规律。结果表明,二次风分布均匀性对炉内稀相区的颗粒浓度分布、悬吊屏表面的颗粒浓度分布、以及六个分离器的进口颗粒流率,都有较大影响。按实际CFB锅炉二次风分布参数完成的数值模拟结果,更接近于锅炉的运行情况。模拟结果还表明,二次风对密相区的扰动很大,特别有利于超大炉膛密相区的气固混合。将模拟结果与炉膛高度为60m的CFB冷模试验台的轴向颗粒浓度分布和部分热态试验测量结果进行对比,计算结果与试验测量结果基本吻合。
This paper numerically investigated the gas-solid flow distribution in a 600 MW supercritical circulating fluidized bed boiler under different loads and different secondary air distributions. The Euler-Lagrange model was used in this simulation and corresponding results were compared with the test measurements. The results revealed that the distribution of secondary air strongly affected the solid concentrations in the dilute phase and suspended panels of furnace, as well as the entrance particle mass flux of six cyclones. The simulation results based on actual boiler secondary air distribution parameters would be closer to the operation of the CFB boiler. The simulation also indicated that secondary air had a great influence on the gas-solid mixing in dense phase of the supercritical CFB boiler. Compared with the axial particle concentration distribution of the 60-meter-high CFB riser and the partial thermal experimental data, the simulation results were provided with high accuracy.
This paper numerically investigated the gas-solid flow distribution in a 600 MW supercritical circulating fluidized bed boiler under different loads and different secondary air distributions. The Euler-Lagrange model was used in this simulation and corresponding results were compared with the test measurements. The results revealed that the distribution of secondary air strongly affected the solid concentrations in the dilute phase and suspended panels of furnace, as well as the entrance particle mass flux of six cyclones. The simulation results based on actual boiler secondary air distribution parameters would be closer to the operation of the CFB boiler. The simulation also indicated that secondary air had a great influence on the gas-solid mixing in dense phase of the supercritical CFB boiler. Compared with the axial particle concentration distribution of the 60-meter-high CFB riser and the partial thermal experimental data, the simulation results were provided with high accuracy.
引文
[1]程乐鸣,许霖杰,夏云飞,等.600MW超临界循环流化床锅炉关键问题研究[J].中国电机工程学报,2015,35(21):5520-5532.Cheng Leming,Xu Linjie,Xia Yunfeng,et al.Key issues and solutions in development of the 600MW CFB boiler[J].Proceedings of the CSEE,2015,35(21):5520-5532(in Chinese).
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[3]蔡润夏,吕俊复,凌文,等.超(超)临界循环流化床锅炉技术的发展[J].中国电力,2016,49(12):1-7.Cai Runxia,Lv Junfu,Lin Wen,et al.Progress of supercritical and ultra-supercritical circulating fluidized bed[J].Boiler Technology.Electric Power,2016,49(12):1-7(in Chinese).
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[5]周星龙,谢建文,范永胜,等.大型循环流化床锅炉的发展现状与研究进展[C]//2013年中国电机工程学会年会论文集.北京:中国电机工程学会,2013.Zhou Xinglong,Xie Jianwen,Fan Yongsheng,et al.Development and research of large-scale circulating fluidized bed boiler[C]//Annual Meeting of CSEE.Beijing:Chinese Society For Electrical Engineering,2013(in Chinese).
[6]雷秀坚,严谨,谢雄,等.600MWCFB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 Xiu-jian,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).
[7]郭贞,郭庆杰,刘宝勇,等.循环流化床底部区域流动特性的数值模拟[J].中国粉体技术,2008,15(6):13-17.Guo Zhen,Guo Qingjie,Liu Baoyong,et al.Simulation of flow characteristics in bottom zone of a circulating fluidize bed[J].China Powder Science and Technology,2008,15(6):13-17(in Chinese).
[8]王超,程乐鸣,周星龙,等.600MW超临界循环流化床锅炉炉膛气固流场的数值模拟[J].中国电机工程学报,2011,31(14):1-7.Wang Chao,Cheng Leming,Zhou Xinglong,et al.Numerical simulation of gas-solid hydrodynamics in a600MW supercritical circulating fluidized bed boiler furnace[J].Proceedings of the CSEE,2011,31(14):1-7(in Chinese).
[9]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).
[10]Jiang Y,Qiu G,Wang H.Modelling and experimental investigation of the full-loop gas-solid flow in a circulating fluidized bed with six cyclone separators[J].Chemical Engineering Science,2014,109(16):85-97.
[11]邱桂芝,叶佳敏,王海刚.大型循环流化床环形炉膛中气固流动特性的CPFD数值模拟[J].中国科学院大学学报,2016,33(2):218-222.Qiu Guizhi,Ye Jiamin,Wang Haigang,et al.CPFDsimulation of gas-solids flow in annular combustion chamber of large-scale circulating fluidized bed[J].Journal of University of Chinese Academy of Sciences,2016,33(2):218-222(in Chinese).
[12]张瑞卿,杨海瑞,吕俊复.应用于循环流化床锅炉气固流动和燃烧的CPFD数值模拟[J].中国电机工程学报,2013,33(23):75-83.Zhang Ruiqing,Yang Hairui,LüJunfu.Application of CPFD approach on gas-solid flow and combustionin industrial CFB boilers[J].Proceedings of the CSEE,2013,33(23):75-83(in Chinese).
[13]谢俊,钟文琪,金保昇,等.工业规模CFB垃圾焚烧锅炉的三维全循环数值模拟[C]//中国工程热物理学会论文,2015.Xie Jun,Zhong Wenqi,Jin Baosheng,et al.Threedimensional full-cycle numerical simulation of industrial scale CFB waste incineration boiler[C]//Journal of Engineering Thermophysics Papers,2015.
[14]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].中国电机工程学报,2018,38(2):406-412.Zhou Jinliang,Wang Quanhai,Yan Jin.Experimental and numerical simulation on the uniformity of secondary air system of baima 600MW Supercritical CFB boiler[J].Proceedings of the CSEE,2018,38(2):406-412(in Chinese).
[15]Snider D M.An incompressible three-dimensional multiphase particle-in-cell model for dense particle flows[J].Journal of Computational Physics,2001,170(2):523-549.
[16]Cundall PA,Strack ODL.A discrete numerical-model for granular assemblies-reply[J].Geotechnique,1980,30(3):335-336.
[17]Andrews MJ,O'rourke PJ.The multiphase particle-in-cell(MP-PIC)method for dense particulate flows[J].International Journal of Multiphase Flow,1996,22(2):379-402.
[18]Xu J,Lu X,Zhang W,et al.Effects of superficial gas velocity and static bed height on gas-solid flow characteristics in a 60-meter-high transparent CFB riser[J].Chemical Engineering Journal,2018,334(Supplement C):545-557.
[19]周星龙.600MW循环流化床锅炉炉膛气固流动和受热面传热的研究[D].杭州:浙江大学,2012.Zhou Xinglong.Research on the hvdrodvnamics and heat transfer in a 600M CFB boiler furnace[D].Hangzhou:Zhejiang University,2012(in Chinese).
[20]Zhou X,Cheng L,Wang Q,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.
[2]聂立,王鹏,彭雷.600MW超临界循环流化床锅炉的设计[J].动力工程,2008,28(5):701-706.Nie Li,Wang Peng,Peng Lei,et al.Design of 600 MWsupercritical circulating fluidized bed boiler[J].Journal of Power Engineering,2008,28(5):701-706(in Chinese).
[3]蔡润夏,吕俊复,凌文,等.超(超)临界循环流化床锅炉技术的发展[J].中国电力,2016,49(12):1-7.Cai Runxia,Lv Junfu,Lin Wen,et al.Progress of supercritical and ultra-supercritical circulating fluidized bed[J].Boiler Technology.Electric Power,2016,49(12):1-7(in Chinese).
[4]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.Equipment and operation of600MW supercritical circulating fluidized bed boiler[M].Beijing:China Electric Power Press,2012(in Chinese).
[5]周星龙,谢建文,范永胜,等.大型循环流化床锅炉的发展现状与研究进展[C]//2013年中国电机工程学会年会论文集.北京:中国电机工程学会,2013.Zhou Xinglong,Xie Jianwen,Fan Yongsheng,et al.Development and research of large-scale circulating fluidized bed boiler[C]//Annual Meeting of CSEE.Beijing:Chinese Society For Electrical Engineering,2013(in Chinese).
[6]雷秀坚,严谨,谢雄,等.600MWCFB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 Xiu-jian,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).
[7]郭贞,郭庆杰,刘宝勇,等.循环流化床底部区域流动特性的数值模拟[J].中国粉体技术,2008,15(6):13-17.Guo Zhen,Guo Qingjie,Liu Baoyong,et al.Simulation of flow characteristics in bottom zone of a circulating fluidize bed[J].China Powder Science and Technology,2008,15(6):13-17(in Chinese).
[8]王超,程乐鸣,周星龙,等.600MW超临界循环流化床锅炉炉膛气固流场的数值模拟[J].中国电机工程学报,2011,31(14):1-7.Wang Chao,Cheng Leming,Zhou Xinglong,et al.Numerical simulation of gas-solid hydrodynamics in a600MW supercritical circulating fluidized bed boiler furnace[J].Proceedings of the CSEE,2011,31(14):1-7(in Chinese).
[9]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).
[10]Jiang Y,Qiu G,Wang H.Modelling and experimental investigation of the full-loop gas-solid flow in a circulating fluidized bed with six cyclone separators[J].Chemical Engineering Science,2014,109(16):85-97.
[11]邱桂芝,叶佳敏,王海刚.大型循环流化床环形炉膛中气固流动特性的CPFD数值模拟[J].中国科学院大学学报,2016,33(2):218-222.Qiu Guizhi,Ye Jiamin,Wang Haigang,et al.CPFDsimulation of gas-solids flow in annular combustion chamber of large-scale circulating fluidized bed[J].Journal of University of Chinese Academy of Sciences,2016,33(2):218-222(in Chinese).
[12]张瑞卿,杨海瑞,吕俊复.应用于循环流化床锅炉气固流动和燃烧的CPFD数值模拟[J].中国电机工程学报,2013,33(23):75-83.Zhang Ruiqing,Yang Hairui,LüJunfu.Application of CPFD approach on gas-solid flow and combustionin industrial CFB boilers[J].Proceedings of the CSEE,2013,33(23):75-83(in Chinese).
[13]谢俊,钟文琪,金保昇,等.工业规模CFB垃圾焚烧锅炉的三维全循环数值模拟[C]//中国工程热物理学会论文,2015.Xie Jun,Zhong Wenqi,Jin Baosheng,et al.Threedimensional full-cycle numerical simulation of industrial scale CFB waste incineration boiler[C]//Journal of Engineering Thermophysics Papers,2015.
[14]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].中国电机工程学报,2018,38(2):406-412.Zhou Jinliang,Wang Quanhai,Yan Jin.Experimental and numerical simulation on the uniformity of secondary air system of baima 600MW Supercritical CFB boiler[J].Proceedings of the CSEE,2018,38(2):406-412(in Chinese).
[15]Snider D M.An incompressible three-dimensional multiphase particle-in-cell model for dense particle flows[J].Journal of Computational Physics,2001,170(2):523-549.
[16]Cundall PA,Strack ODL.A discrete numerical-model for granular assemblies-reply[J].Geotechnique,1980,30(3):335-336.
[17]Andrews MJ,O'rourke PJ.The multiphase particle-in-cell(MP-PIC)method for dense particulate flows[J].International Journal of Multiphase Flow,1996,22(2):379-402.
[18]Xu J,Lu X,Zhang W,et al.Effects of superficial gas velocity and static bed height on gas-solid flow characteristics in a 60-meter-high transparent CFB riser[J].Chemical Engineering Journal,2018,334(Supplement C):545-557.
[19]周星龙.600MW循环流化床锅炉炉膛气固流动和受热面传热的研究[D].杭州:浙江大学,2012.Zhou Xinglong.Research on the hvdrodvnamics and heat transfer in a 600M CFB boiler furnace[D].Hangzhou:Zhejiang University,2012(in Chinese).
[20]Zhou X,Cheng L,Wang Q,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.