暖风器与低温省煤器联合系统变参数热力特性模拟
|
摘要
针对电站锅炉排烟温度高、排烟热损失大的问题,以某亚临界330 MW机组为例,采用Ebsilon软件建立了包含锅炉、汽轮机和发电机的完整模型;在此模型基础上对常规低温省煤器和暖风器与低温省煤器联合系统进行了热力特性模拟,着重分析了设计不同的暖风器出口风温时,联合系统的特性变化,及其对汽轮机热耗率、锅炉效率、发电煤耗、辅机功耗和供电煤耗的影响。结果表明:暖风器与低温省煤器联合系统具有较大的节能潜力,与常规低温省煤器系统相比,联合系统可多节煤0.5~0.9 g/(k W·h);设计不同的暖风器出口风温时,供电煤耗降幅随风温升高而增加,但风温升高至一定程度后,节能量不再变大。
Aiming at solving the problem of high boiler exhaust gas temperature and large exhaust heat loss in power plants, taking a 330 MW subcritical unit as an example, a complete system model including boiler, steam turbine and generator is set up using the Ebsilon software. Based on this model, thermal characteristics simulation is conducted on the combined system of normal low temperature economizer and the combined system of air heater and low temperature economizer. The characteristics of the combined system is analyzed with different air heater outlet temperatures, and the effects of air heater outlet temperature on turbine heat rate, boiler efficiency, power generation coal consumption, auxiliary power consumption and power coal consumption are also analyzed. The results show that, the combined system of air heater and low temperature economizer has great potential in energy saving. The combined system can save more 0.5~0.9 g/(k W·h) of coal than the normal low temperature economizer. When designing the temperature of the air heater outlet, the decrease of power coal consumption increases with the air heater outlet temperature. However, when the temperature goes up to a certain extent, the energy saving capacity no longer increases.
Aiming at solving the problem of high boiler exhaust gas temperature and large exhaust heat loss in power plants, taking a 330 MW subcritical unit as an example, a complete system model including boiler, steam turbine and generator is set up using the Ebsilon software. Based on this model, thermal characteristics simulation is conducted on the combined system of normal low temperature economizer and the combined system of air heater and low temperature economizer. The characteristics of the combined system is analyzed with different air heater outlet temperatures, and the effects of air heater outlet temperature on turbine heat rate, boiler efficiency, power generation coal consumption, auxiliary power consumption and power coal consumption are also analyzed. The results show that, the combined system of air heater and low temperature economizer has great potential in energy saving. The combined system can save more 0.5~0.9 g/(k W·h) of coal than the normal low temperature economizer. When designing the temperature of the air heater outlet, the decrease of power coal consumption increases with the air heater outlet temperature. However, when the temperature goes up to a certain extent, the energy saving capacity no longer increases.
引文
[1]车得福.锅炉[M].1版.西安:西安交通大学出版社,2004:380-382.CHE Defu.The boilers[M].1st ed.Xi’an:Xi’an Jiaotong University Press,2004:380-382(in Chinese).
[2]齐林虎,黄新元,刘红英.低低温省煤器联合暖风器系统在300 MW机组的应用[J].华电技术,2016,38(10):22-24.QI Linhu,HUANG Xinyuan,LIU Hongying.Application of the system of low temperature economizer with steamair heater on 300 MW power unit[J].Huadian Technology,2016,38(10):22-24.
[3]李斌,党自力.低温省煤器设计及其动态特性分析[J].热力发电,2014,43(2):25-29.LI Bin,DANG Zili.Design and dynamic analysis of a low temperature economizer[J].Thermal Power Generation,2014,43(2):25-29.
[4]薛宁,印旭洋,王春昌.热一次风加热器与低压省煤器的联合应用[J].热力发电,2015,44(2):64-68.XUE Ning,YIN Xuyang,WANG Chunchang.Combined application of hot primary air heater and low pressure economizer[J].Thermal Power Generation,2015,44(2):64-68.
[5]王宇豪,刘定坡,李淑宏,等.暖风器的经济性分析[J].锅炉制造,2015(5):53-56.WANG Yuhao,LIU Dingpo,LI Shuhong,et al.Economic analysis of air heater[J].Boiler Manufacturing,2015(5):53-56.
[6]BHATT M S.Effect of air ingress on the energy performance of coal fire thermal power plant[J].Energy Conversion and Management,2007,48(7):2150-2160.
[7]刘鹤忠,连正权.低温省煤器在火力发电厂中的运行探讨[J].电力勘测设计,2010(4):32-38.LIU Hezhong,LIAN Zhengquan.Application of low temperature saving coal device in generate electricity power plant[J].Electric Power Survey and Design,2010(4):32-38.
[8]郭景州,李卫华,冯文革.暖风器对锅炉排烟温度影响的研究[J].华北电力技术,2004(12):18-19.GUO Jingzhou,LI Weihua,FENG Wenge.Influnce of air heater on boiler exhaust temperature[J].North China Electric Power,2004(12):18-19.
[9]周超,彭晓军,牛利权.北方电厂应用暖风器控制空预器低温腐蚀的分析与研究[J].华北电力技术,2012(1):46-50.ZHOU Chao,PENG Xiaojun,NIU Liquan.Analysis and research on low-temperature corrosion control for air preheater with heater in north power plant[J].North China Electric Power,2012(1):46-50.
[10]赵之军.锅炉暖风器系统存在的问题及解决措施[J].发电设备,2005,19(2):94-96.ZHAO Zhijun.Problems existing with air preheating systems of boilers and ways of solution[J].Power Equipment,2005,19(2):94-96.
[11]张华东,张知翔,贾兆鹏,等.低温省煤器与暖风器联合系统应用研究[J].热力发电,2016,45(10):127-132.ZHANG Huadong,ZHANG Zhixiang,JIA Zhaopeng,et al.Application of combined system of low pressure economizer and air heater[J].Thermal Power Generation,2016,45(10):127-132.
[12]李钧,阎维平,高宝桐,等.烟气酸露点温度的计算分析[J].热力发电,2009,38(4):31-34.LI Jun,YAN Weiping,GAO Baotong,et al.Calculation and analysis of acid dew-point for flue gas[J].Thermal Power Generation,2009,38(4):31-34.
[13]丁兴武,范庆伟,苏永宁,等.抽汽加热暖风器系统机组能耗指标计算方法分析[J].热能动力工程,2016,31(10):50-53.DING Xingwu,FAN Qingwei,SU Yongning,et al.Calculation of coal consumption rate for power plant with steam turbine extractions heating air heater system[J].Journal of Engineering for Thermal Energy and Power,2016,31(10):50-53.
[2]齐林虎,黄新元,刘红英.低低温省煤器联合暖风器系统在300 MW机组的应用[J].华电技术,2016,38(10):22-24.QI Linhu,HUANG Xinyuan,LIU Hongying.Application of the system of low temperature economizer with steamair heater on 300 MW power unit[J].Huadian Technology,2016,38(10):22-24.
[3]李斌,党自力.低温省煤器设计及其动态特性分析[J].热力发电,2014,43(2):25-29.LI Bin,DANG Zili.Design and dynamic analysis of a low temperature economizer[J].Thermal Power Generation,2014,43(2):25-29.
[4]薛宁,印旭洋,王春昌.热一次风加热器与低压省煤器的联合应用[J].热力发电,2015,44(2):64-68.XUE Ning,YIN Xuyang,WANG Chunchang.Combined application of hot primary air heater and low pressure economizer[J].Thermal Power Generation,2015,44(2):64-68.
[5]王宇豪,刘定坡,李淑宏,等.暖风器的经济性分析[J].锅炉制造,2015(5):53-56.WANG Yuhao,LIU Dingpo,LI Shuhong,et al.Economic analysis of air heater[J].Boiler Manufacturing,2015(5):53-56.
[6]BHATT M S.Effect of air ingress on the energy performance of coal fire thermal power plant[J].Energy Conversion and Management,2007,48(7):2150-2160.
[7]刘鹤忠,连正权.低温省煤器在火力发电厂中的运行探讨[J].电力勘测设计,2010(4):32-38.LIU Hezhong,LIAN Zhengquan.Application of low temperature saving coal device in generate electricity power plant[J].Electric Power Survey and Design,2010(4):32-38.
[8]郭景州,李卫华,冯文革.暖风器对锅炉排烟温度影响的研究[J].华北电力技术,2004(12):18-19.GUO Jingzhou,LI Weihua,FENG Wenge.Influnce of air heater on boiler exhaust temperature[J].North China Electric Power,2004(12):18-19.
[9]周超,彭晓军,牛利权.北方电厂应用暖风器控制空预器低温腐蚀的分析与研究[J].华北电力技术,2012(1):46-50.ZHOU Chao,PENG Xiaojun,NIU Liquan.Analysis and research on low-temperature corrosion control for air preheater with heater in north power plant[J].North China Electric Power,2012(1):46-50.
[10]赵之军.锅炉暖风器系统存在的问题及解决措施[J].发电设备,2005,19(2):94-96.ZHAO Zhijun.Problems existing with air preheating systems of boilers and ways of solution[J].Power Equipment,2005,19(2):94-96.
[11]张华东,张知翔,贾兆鹏,等.低温省煤器与暖风器联合系统应用研究[J].热力发电,2016,45(10):127-132.ZHANG Huadong,ZHANG Zhixiang,JIA Zhaopeng,et al.Application of combined system of low pressure economizer and air heater[J].Thermal Power Generation,2016,45(10):127-132.
[12]李钧,阎维平,高宝桐,等.烟气酸露点温度的计算分析[J].热力发电,2009,38(4):31-34.LI Jun,YAN Weiping,GAO Baotong,et al.Calculation and analysis of acid dew-point for flue gas[J].Thermal Power Generation,2009,38(4):31-34.
[13]丁兴武,范庆伟,苏永宁,等.抽汽加热暖风器系统机组能耗指标计算方法分析[J].热能动力工程,2016,31(10):50-53.DING Xingwu,FAN Qingwei,SU Yongning,et al.Calculation of coal consumption rate for power plant with steam turbine extractions heating air heater system[J].Journal of Engineering for Thermal Energy and Power,2016,31(10):50-53.