基于效能-传热单元数的回转式空预器换热性能计算方法
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摘要
针对回转式空气预热器(空预器)换热效率计算,提出了一种不需要烟风流量热容比修正曲线的近似方法,烟风流量热容比修正曲线在PTC 4.3的空预器效率计算中是必须的,但又是难以得到的。本方法以效能-传热单元数原理为基础,通过分析大量的、涵盖多种煤质和多种容量的锅炉空预器设计参数,得到不同传热单元数下的空预器效能和烟风流量热容比的关系,进而建立了空预器换热效率的计算模型。以某机组的空预器改造为例,采用该模型计算了空预器换热效率,得到的结果较为准确,与设计值和实际情况相符。
The correction curves of heat capacity ratio of flue gas flow rate are necessary in heat transfer efficiency calculation for rotary air preheaters according to the PTC 4.3, but it is difficult to obtain. In this paper,an approximate method was proposed, which does not require the correction curves. On the basis of the effectiveness-NTU(number of transfer units) method, this method analyzes a large number of design parameters of air preheaters covering a variety of coal qualities and capacities, and obtains the relationship between the efficiency of air preheater and the heat-capacity ratio of flue gas flow and air flow with different heat transfer units, then it establishes the calculation model for heat transfer efficiency of air preheaters. Finally, this method was applied to calculate the heat transfer efficiency of air preheaters in a power plant, the results are consistent with the design and actual operation situations, indicating this method is relatively accurate.
The correction curves of heat capacity ratio of flue gas flow rate are necessary in heat transfer efficiency calculation for rotary air preheaters according to the PTC 4.3, but it is difficult to obtain. In this paper,an approximate method was proposed, which does not require the correction curves. On the basis of the effectiveness-NTU(number of transfer units) method, this method analyzes a large number of design parameters of air preheaters covering a variety of coal qualities and capacities, and obtains the relationship between the efficiency of air preheater and the heat-capacity ratio of flue gas flow and air flow with different heat transfer units, then it establishes the calculation model for heat transfer efficiency of air preheaters. Finally, this method was applied to calculate the heat transfer efficiency of air preheaters in a power plant, the results are consistent with the design and actual operation situations, indicating this method is relatively accurate.
引文
[1]Performance test codes:air heaters:ASME PTC 4.3-1968(R1991)[S].
[2]李杨,周元祥,谢天,等.三分仓空预器热力计算的简化方法[J].动力工程学报,2013,33(1):37-41.LI Yang,ZHOU Yuanxiang,XIE Tian,et al.A simplified method for heat balance calculation of tri-sectional regenerative air heater[J].Journal of Chinese Society of Power Engineering,2013,33(1):37-41.
[3]冷伟,王渡.一种改进的回转式空气预热器热力计算方法[J].动力工程,2005,25(3):392-395.LENG Wei,WANG Du.An improved way for thermal calculation of rotary air preheaters[J].Power Engineering,2005,25(3):392-395.
[4]阎维平,李皓宇,黄景立,等.电站锅炉三分仓回转式空气预热器热力计算方法研究[J].热力发电,2009,38(3):44-47.YAN Weiping,LI Haoyu,HUANG Jingli,et al.Study on thermodynamic calculation of tri-section regenerative air preheater for utility boilers[J].Thermal Power Generation,2009,38(3):44-47.
[5]周俊虎,杨卫娟,靳彦涛,等.三分仓空气预热器热力计算的研究[J].动力工程学报,2003,23(6):2810-2813.ZHOU Junhu,YANG Weijuan,JIN Yantao,et al.Research on the heat balance calculation of the tri-sectional regenerative air preheater[J].Power Engineering,2003,23(6):2810-2813.
[6]冯俊凯,沈幼庭,杨瑞昌.锅炉原理及计算[M].3版.北京:中国科学出版社,2003:357-367.FENG Junkai,SHEN Youting,YANG Ruichang.Boiler principle and calculation[M].3rd ed.Beijing:China Science Press,2003:357-367.
[7]郑凯,周克毅,黄军林.一种改进的三分仓空气预热器热力计算方法[J].动力工程学报,2012,32(1):31-35.ZHENG Kai,ZHOU Keyi,HUANG Junlin.An improved thermal calculation method for tri-sectional rotary air preheaters[J].Journal of Chinese Society of Power Engineering,2012,32(1):31-35.
[8]胡华进,徐治皋.三分仓空气预热器传热特性的算法研究[J].动力工程学报,1998,18(1):54-57.HU Huajin,XU Zhigao.Calculating method study of the heat transfer characteristics for the tri-sector air preheater[J].Power Engineering,1998,18(1):54-57.
[9]冷伟,陈曦,于翔,等.回转式空气预热器非稳定换热的分析[J].动力工程,2006,26(3):412-416.LENG Wei,CHEN Xi,YU Xiang,et al.Analysis of unsteady heat exchange of rotary air preheaters[J].Power Engineering,2006,26(3):412-416.
[10]阎维平,李皓宇.三分仓回转式空预器传热的数值解法[J].动力工程学报,2009,29(9):841-845.YAN Weiping,LI Haoyu.Numerical method on heat transfer in tri-sectional regenerative air heater[J].Power Engineering,2009,29(9):841-845.
[11]李豫.三分仓空气预热器建模及锅炉系统变工况性能研究[D].武汉:华中科技大学,2015:48.LI Yu.Simulation modeling of tri-sectional regenerative air heater and variable conditions analysis for super-critical boiler system[D].Wuhan:Huazhong University of Science and Technology,2015:48.
[12]黄景立.三分仓回转式空气预热器的热力计算方法研究[D].保定:华北电力大学,2008:33.HUANG Jingli.Research on the thermal analysis of the three section regenerative air preheater[D].Baoding:North China Electric Power University,2008:33.
[13]陈珣,段学农.基于ASME PTC 4.3的三分仓回转式空气预热器换热性能评价[J].锅炉技术,2014,45(2):18-22.CHEN Xun,DUAN Xuenong.Evaluation of the heat transfer performance of tri-sector rotary air preheater based on ASME PTC 4.3[J].Boiler Technology,2014,45(2):18-22.
[14]MCLAUGHLIN D C,NASAL J R.Applying the X-ratio correction to calculated air heater efficiency:an alternate method[C].ASME 2010 Power Conference.2010:893-899.
[15]杨世铭,陶文铨.传热学[M].4版.北京:高等教育出版社,2006:459-510.YANG Shiming,TAO Wenquan.Heat transfer[M].4th ed.Beijing:Higher Education Press,2006:459-510.
[2]李杨,周元祥,谢天,等.三分仓空预器热力计算的简化方法[J].动力工程学报,2013,33(1):37-41.LI Yang,ZHOU Yuanxiang,XIE Tian,et al.A simplified method for heat balance calculation of tri-sectional regenerative air heater[J].Journal of Chinese Society of Power Engineering,2013,33(1):37-41.
[3]冷伟,王渡.一种改进的回转式空气预热器热力计算方法[J].动力工程,2005,25(3):392-395.LENG Wei,WANG Du.An improved way for thermal calculation of rotary air preheaters[J].Power Engineering,2005,25(3):392-395.
[4]阎维平,李皓宇,黄景立,等.电站锅炉三分仓回转式空气预热器热力计算方法研究[J].热力发电,2009,38(3):44-47.YAN Weiping,LI Haoyu,HUANG Jingli,et al.Study on thermodynamic calculation of tri-section regenerative air preheater for utility boilers[J].Thermal Power Generation,2009,38(3):44-47.
[5]周俊虎,杨卫娟,靳彦涛,等.三分仓空气预热器热力计算的研究[J].动力工程学报,2003,23(6):2810-2813.ZHOU Junhu,YANG Weijuan,JIN Yantao,et al.Research on the heat balance calculation of the tri-sectional regenerative air preheater[J].Power Engineering,2003,23(6):2810-2813.
[6]冯俊凯,沈幼庭,杨瑞昌.锅炉原理及计算[M].3版.北京:中国科学出版社,2003:357-367.FENG Junkai,SHEN Youting,YANG Ruichang.Boiler principle and calculation[M].3rd ed.Beijing:China Science Press,2003:357-367.
[7]郑凯,周克毅,黄军林.一种改进的三分仓空气预热器热力计算方法[J].动力工程学报,2012,32(1):31-35.ZHENG Kai,ZHOU Keyi,HUANG Junlin.An improved thermal calculation method for tri-sectional rotary air preheaters[J].Journal of Chinese Society of Power Engineering,2012,32(1):31-35.
[8]胡华进,徐治皋.三分仓空气预热器传热特性的算法研究[J].动力工程学报,1998,18(1):54-57.HU Huajin,XU Zhigao.Calculating method study of the heat transfer characteristics for the tri-sector air preheater[J].Power Engineering,1998,18(1):54-57.
[9]冷伟,陈曦,于翔,等.回转式空气预热器非稳定换热的分析[J].动力工程,2006,26(3):412-416.LENG Wei,CHEN Xi,YU Xiang,et al.Analysis of unsteady heat exchange of rotary air preheaters[J].Power Engineering,2006,26(3):412-416.
[10]阎维平,李皓宇.三分仓回转式空预器传热的数值解法[J].动力工程学报,2009,29(9):841-845.YAN Weiping,LI Haoyu.Numerical method on heat transfer in tri-sectional regenerative air heater[J].Power Engineering,2009,29(9):841-845.
[11]李豫.三分仓空气预热器建模及锅炉系统变工况性能研究[D].武汉:华中科技大学,2015:48.LI Yu.Simulation modeling of tri-sectional regenerative air heater and variable conditions analysis for super-critical boiler system[D].Wuhan:Huazhong University of Science and Technology,2015:48.
[12]黄景立.三分仓回转式空气预热器的热力计算方法研究[D].保定:华北电力大学,2008:33.HUANG Jingli.Research on the thermal analysis of the three section regenerative air preheater[D].Baoding:North China Electric Power University,2008:33.
[13]陈珣,段学农.基于ASME PTC 4.3的三分仓回转式空气预热器换热性能评价[J].锅炉技术,2014,45(2):18-22.CHEN Xun,DUAN Xuenong.Evaluation of the heat transfer performance of tri-sector rotary air preheater based on ASME PTC 4.3[J].Boiler Technology,2014,45(2):18-22.
[14]MCLAUGHLIN D C,NASAL J R.Applying the X-ratio correction to calculated air heater efficiency:an alternate method[C].ASME 2010 Power Conference.2010:893-899.
[15]杨世铭,陶文铨.传热学[M].4版.北京:高等教育出版社,2006:459-510.YANG Shiming,TAO Wenquan.Heat transfer[M].4th ed.Beijing:Higher Education Press,2006:459-510.