超超临界循环流化床外置换热器壁温偏差特性研究
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摘要
为减小高效超超临界循环流化床锅炉外置换热器受热面热偏差,通过600 MW超临界循环流化床(Circulating Fluidized Bed,CFB)锅炉实炉试验,分析了外置换热器的热偏差特性。结果表明:外置换热器内存在热偏差,靠外置换热器边壁区域温度较低,中间区域温度较高,温差可达50℃。根据实炉数据,通过数值计算,复现了外置换热器偏差特性,并提出通过工质侧结构调整分配流量来解决此偏差问题的方案,可使热偏差显著降低,确保660 MW高效超超临界CFB锅炉末级再热器壁温控制在现有材料允许壁温范围内,且有一定裕量,安全可靠。
In order to reduce the heat deviation of the heated surface of the external heat exchanger in an advanced ultra-supercritical circulating fluidized bed boiler,experimental studies on the thermal deviation characteristics of Baima 600 MW supercritical CFB boiler are carried out.The experimental results show that the heat deviation of the external heat exchanger exists.The temperature in the side wall of the external heat exchanger is lower,while the temperature in the middle region is higher,and the temperature difference can reach about 50 ℃.According to the field test results,the deviation characteristics of the external heat exchanger are mimicked by the numerical calculation,and the scheme to solve the deviation by adjusting the distribution flow of the working material side structure is proposed.It can reduce the thermal deviation significantly and ensure that the wall temperature can be controlled within the allowable wall temperature range of the existing materials,and has a certain margin,which is safe and reliable.
In order to reduce the heat deviation of the heated surface of the external heat exchanger in an advanced ultra-supercritical circulating fluidized bed boiler,experimental studies on the thermal deviation characteristics of Baima 600 MW supercritical CFB boiler are carried out.The experimental results show that the heat deviation of the external heat exchanger exists.The temperature in the side wall of the external heat exchanger is lower,while the temperature in the middle region is higher,and the temperature difference can reach about 50 ℃.According to the field test results,the deviation characteristics of the external heat exchanger are mimicked by the numerical calculation,and the scheme to solve the deviation by adjusting the distribution flow of the working material side structure is proposed.It can reduce the thermal deviation significantly and ensure that the wall temperature can be controlled within the allowable wall temperature range of the existing materials,and has a certain margin,which is safe and reliable.
引文
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[19] 张文清,卢啸风.大型循环流化床锅炉外置式换热器运行特性的对比研究[J].热能动力工程,2017,32(6):97-101.ZHANG Wen-qing,LU Xiao-feng.Comparative study on operating characteristics of external heat exchangers for large CFB Boilers[J].Journal of Engineering for Thermal Energy and Power,2017,32(6):97-101.
[20] 冯俊凯,岳光溪,吕俊复.循环流化床燃烧锅炉[M].北京:中国电力出版社,2003.FENG Jun-kai,YUE Guang-xi,LYU Jun-fu.Circulating fluidized bed combustion boiler [M].Beijing:China Electric Power Press,2003.
[21] 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,1997.CEN Ke-fa,NI Ming-jiang,LUO Zhong-yang,et al.Theory,design and operation of circulating fluidized bed boiler[M].Beijing:China Electric Power Press,1997.
[2] YUE Guang-xi,YANG Hai-rui,LU Jun-fu,et al.Latest development of CFB boilers in China[C]//20th International Conference on Fluidized Bed Combustion,Xi′an,2009.
[3] 聂立,王鹏,彭雷,等.600 MW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 MW supercritical circulating fluidized bed boiler [J].Power Engineering,2008,28(5):701-706.
[4] 发改能源[2014]2093号,《煤电节能减排升级与改造行动计划(2014—2020年)》[S].Development and Reform Energy[2014] 2093,Action plan for energy conservation and emission reduction and transformation of coal and electricity (2014—2020)[S].
[5] 聂立,苏虎,鲁佳易,等.一种带二次再热的循环流化床锅炉[P].中国:ZL201310329406.X,2013-08-01.NIE Li,SU Hu,LU Jia-yi,et al.A circulating fluidized bed boiler with twice reheat system [P].China:ZL201310329406.X,2013-08-01.
[6] 巩李明,聂立,王鹏,等.东方锅炉660 MW/1 000 MW超临界环形炉膛CFB锅炉开发[C]//中国循环流化床发电生产运营管理,438-442,成都,2013.GONG Li-ming,NIE Li,WANG Peng,et al.Dongfang Boiler 660 MW/1 000 MW supercritical annular furnace CFB boiler development[C]//China Circulating Fluidized Bed Power Generation Production and Operation Management,438-442,Chengdu,2013.
[7] 聂立,苏虎,巩李明,等.循环流化床锅炉[P].中国:ZL201110031308.9,2014-06-18.NIE Li,SU Hu,GONG Li-ming,et al.Circulating fluidized bed boiler [P].China :ZL201110031308.9,2014-06-18.
[8] 徐鹏,胡修奎,霍锁善,等.超超临界循环流化床锅炉[P].中国:201520506361.3,2015-12-30.XU Peng,HU Xiu-kui,HUO Suo-shan,et al.Ultra supercritical circulating fluidized bed boiler [P].China:201520506361.3,2015-12-30.
[9] 孙献斌.700 ℃超超临界循环流化床锅炉方案设计研究[J].中国电机工程学报,2014,34(23):3977-3982.SUN Xian-bin.Study on the design of 700 ℃ degree ultra supercritical CFB boiler[J].Proceedings of the CSEE ,2014,34(23):3977-3982.
[10] 聂立,苏虎,鲁佳易,等.一种700 ℃及以上蒸汽参数的高床温循环流化床锅炉[P].中国:ZL201310329407.4,2013-08-01.NIE Li,SU Hu,LU Jia-yi.A high temperature circulating fluidized bed boiler with over 700 ℃ steam temperature[P].China:ZL201310329407.4,2013-08-01.
[11] JUKOLA P,KALLIO S,DERNJATIN P.Time-averaged CFD modelling of NOx reduction by over fire air in a full scale CFB furnace[C]//In 22nd Int Conference on Fluidized Bed Combustion,1064-1071,Finland,2015.
[12] 王鹏,苏虎,鲁佳易,等.循环流化床锅炉二次风布风方法[P].中国:201410516049.2,2015-01-14.WANG Peng,SU Hu,LU Jia-yi,et al.The secondary air distribution method of circulating fluidized bed boiler[P].China:201410516049.2,2015-01-14.
[13] 邹阳军,程乐鸣,何胜.六回路循环流化床锅炉单回路中断的影响实验研究[J].热能动力工程,2016,31(11):69-73.ZOU Yang-jun,CHENG Le-ming,HE Sheng.Experimental study on the influence of single loop interruption in six loop circulating fluidized bed boiler[J].Journal of Engineering for Thermal Energy and Power,2016,31(11):69-73.
[14] 黎懋亮,易广宙.东方1 000 MW高效超超临界锅炉设计方案[J].东方电气评论,2015(4):26-30.LI Mao-liang,YI Guang-zhou.Dongfang 1 000 MW high efficiency ultra supercritical boiler design [J].Dongfang Electric Review,2015(4):26-30.
[15] ASME BPVC II D-2013.ASME boiler and pressure vessel code materials Part D properties (Metric) [S].
[16] 郑兴胜,徐鹏,胡修奎,等.600 MW超临界CFB锅炉高再外置换热器运行调整试验研究[J].东方电气评论,2016,30:23-26.ZHENG Xing-sheng,XU Peng,HU Xiu-kui,et al.Experimental study on operation adjustment of 600 MW high critical CFB boiler high external heat exchanger[J].Dongfang Electric Review,2016,30:23-26.
[17] 王勤辉,施正伦,程乐鸣,等.非机械阀控制外置式换热器的试验研究[J].动力工程,2001,21(4):1324-1330.WANG Qin-hui,SHI Zheng-lun,CHENG Le-ming,et al.Experimental study on external mechanical heat exchanger controlled by non mechanical valves [J].Power Engineering,2001,21(4):1324-1330.
[18] 杨磊.循环流化床锅炉外置式换热器热态实验研究[D].重庆:重庆大学,2007.YANG Lei.Experimental study on external heat exchanger of circulating fluidized bed boiler[D].Chongqing:Chongqing University,2007.
[19] 张文清,卢啸风.大型循环流化床锅炉外置式换热器运行特性的对比研究[J].热能动力工程,2017,32(6):97-101.ZHANG Wen-qing,LU Xiao-feng.Comparative study on operating characteristics of external heat exchangers for large CFB Boilers[J].Journal of Engineering for Thermal Energy and Power,2017,32(6):97-101.
[20] 冯俊凯,岳光溪,吕俊复.循环流化床燃烧锅炉[M].北京:中国电力出版社,2003.FENG Jun-kai,YUE Guang-xi,LYU Jun-fu.Circulating fluidized bed combustion boiler [M].Beijing:China Electric Power Press,2003.
[21] 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,1997.CEN Ke-fa,NI Ming-jiang,LUO Zhong-yang,et al.Theory,design and operation of circulating fluidized bed boiler[M].Beijing:China Electric Power Press,1997.