MAO Rui;LI Yuan;REN Liming;ZHANG Ping′an;CHEN Xinke;MA Lun;FANG Qingyan;

• 1:Rundian Energy Science and Technology Co.
• 2:Ltd.
• 3:State Key Laboratory of Coal Combustion
• 4:Huazhong University of Science and Technology

Abstract：

Reducing the flue gas temperature deviation is one of the characteristics of tower boiler, but the flue gas temperature deviation still exists in the actual operation, and there is still a lack of detailed research on its formation mechanism. In this paper, a 660 MW tangentially fired tower boiler was used to study the characteristics of flue gas flow field deflection and temperature deviation in the penal heating surface area under rated working conditions. Three cases with different flue structures and heating surface layout were designed and analyzed, and the smoke temperature deviation mechanism was deeply and carefully studied.. The results show that the deviation characteristics of simulation are consistent with the experimental values and actual operation deviation characteristics, and there are obvious flow deflection and temperature deviation in the area of penal heating surface. The velocity and temperature in the left area were significantly higher than those in the right area. With the increase of height, the flue gas temperature deviation in the left and right region increases firstly and then decreases, and reaches the maximum near the entrance of the third-stage superheater. The mechanism of flow field deflection and gas temperature deviation is as follows: First, after the gas rotates and rises into the pipe penal, it is constrained by the pipe penal, and the velocity component perpendicular to the direction of the pipe penal turning around, causing gas near the left wall flowing to the forward wall, and gas near the right wall flowing to the back wall. Then, because the flue gas outlet at the top of the furnace is asymmetrically arranged on the rear wall, under the suction of the downstream induced draft fan, gas near the left wall first inclines to the forward wall, then turns to the back wall, and is more centered in the area of the penal heating surface. On the contrary, gas near the right wall is first inclined to the back wall, and then is drained away by the draft fan along the back wall, resulting in a serious deflection of the flow field and a large scale of reflux.

Key Words： tower type boiler;platen heating surface;gas temperature deviation;flow deviation;numerical simulation

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(51676076)

Authors: MAO Rui;LI Yuan;REN Liming;ZHANG Ping′an;CHEN Xinke;MA Lun;FANG Qingyan;

DOI: 10.13226/j.issn.1006-6772.CE21032904

References：

• [1] 中华人民共和国国家统计局.中华人民共和国2020年国民经济和社会发展统计公报[EB/OL].(2020-02-28)[2021-03-29].http://www.stats.gov.cn/tjsj/zxfb/202102/t20210227_1814154.html.Statistical Communique of the People's Republic of China on national economic and social development 2020[EB/OL].(2020-02-28)[2021-03-29].http://www.stats.gov.cn/tjsj/zxfb/202102/t20210227_1814154.html.
• [2] 朱凌志，陈宁，韩华玲.风电消纳关键问题及应对措施分析[J].电力系统自动化，2011,35(22):29-34.ZHU Lingzhi,CHEN Ning,HAN Hualing.Analysis on the key problems and countermeasures of wind power consumption[J].Automation of Electric Power Systems,2011,35(22):29-34.
• [3] 张宁，周天睿，段长刚，等.大规模风电场接入对电力系统调峰的影响[J].电网技术，2010,34(1):152-158.ZHANG Ning,ZHOU Tianrui,DUAN Changgang,et al.Impact of large-scale wind farm connecting with power grid on peak load regulation demand[J].Power System Technology,2010,34(1):152-158.
• [4] 中华人民共和国国家统计局.2020中国统计年鉴[M].北京：中国统计出版社，2020.National Bureau of Statistics of the People's Republic of China.China statistical yearbook 2020 [M].Beijing:China Statistics Press,2020.
• [5] HABIB M A,BEN-MANSOUR R,ABUALHAMAYEL H I.Thermal and emission characteristics in a tangentially fired boiler model furnace[J].International Journal of Energy Research,2010,34(13):1164-1182.
• [6] 陆方.切圆煤粉锅炉低NOx燃烧技术的研究与应用[D].上海：上海交通大学，2009.LU Fang.Study and application of low NOx combustion technology in tangential-firing pulverized coal boiler[D].Shanghai:Shanghai Jiaotong University,2009.
• [7] HE B,ZHU L,WANG J,et al.Computational fluid dynamics based retrofits to reheater panel overheating of NO.3 boiler of Dagang Power Plant[J].Computers & Fluids,2007,36(2):435-444.
• [8] 周月桂，徐通模，惠世恩，等.四角切向燃烧锅炉水平烟道烟温偏差形成机理的研究[J].动力工程学报，2001,21(5):1422-1425.ZHOU Yuegui,XU Tongmo,HUI Shien,et al.Study on the formation mechanism of smoke temperature deviation in horizontal flue of tangential boiler[J].Power Engineering,2001,21(5):1422-1425.
• [9] 姜秀民，崔志刚，马玉峰，等.670 t/h四角切圆锅炉反切消旋的数值模拟和工程实践[J].中国电机工程学报，2005,25(18):109-115.JIANG Xiumin,CUI Zhigang,MA Yufeng,et al.Numerical simulation and engineering practice of a 670 t/h corner tangential boiler with reverse-tangent and swirling-elimination[J].Proceedings of the CSEE,2005,25(18):109-115.
• [10] 陶谦，陈有福，管诗骈，等.1 000 MW超超临界二次再热示范机组锅炉汽温偏差的消除[J].锅炉技术，2016,47(6):16-20.TAO Qian,CHEN Youfu,GUAN Shipan,et al.Elimination of boiler steam temperature deviation of 1 000 MW ultra-supercritical secondary reheat demonstration unit[J].Boiler Technology,2016,47(6):16-20.
• [11] 罗韶辉，李春宏，潘国清.1 000 MW机组塔式锅炉再热汽温偏低的原因分析及调整[J].热力发电，2012,41(11):55-58.LUO Shaohui,LI Chunhong,PAN Gguoqing.Cause analysis and experimental study on low reheat steam temperature of tower type boiler for a 1 000 MW unit[J].Thermal Power Generation,2012,41(11):55-58.
• [12] TIAN D,ZHONG L,TAN P,et al.Influence of vertical burner tilt angle on the gas temperature deviation in a 700 MW low NOx tangentially fired pulverised-coal boiler[J].Fuel Processing Technology,2015,138:616-628.
• [13] ZHOU Y,XU T,HUI S,et al.Experimental and numerical study on the flow fields in upper furnace for large scale tangentially fired boilers[J].Applied Thermal Engineering,2009,29(4):732-739.
• [14] PARK H Y,BAEK S H,KIM H H,et al.Reduction of main steam temperature deviation in a tangentially coal-fired,two pass boiler[J].Fuel,2015,166:509-516.
• [15] ZHOU Y,ZHANG M,XU T,et al.Effect of opposing tangential primary air jets on the flue gas velocity deviation for large-scale tangentially fired boilers[J].Energy & Fuels,2009,23(11):5375-5382.
• [16] LIU Y C,FAN W D,WU M Z.Experimental and numerical studies on the gas velocity deviation in a 600 MWe tangentially fired boiler[J].Applied Thermal Engineering,2017,110:553-563.
• [17] SHA L,LIU H,XU L,et al.Research on the elliptic aerodynamic field in a 1 000 MW dual circle tangential firing single furnace ultra supercritical boiler[J].Energy,2012,46(1):364-373.
• [18] ZHENG L,ZHOU H,CEN K,et al.A comparative study of optimization algorithms for low NOx combustion modification at a coal-fired utility boiler[J].Expert Systems with Applications,2009,36(22):2780-2793.
• [19] MODLINSKI N.Computational modeling of a utility boiler tangentially-fired furnace retrofitted with swirl burners[J].Fuel Processing Technology,2010,91(11):1601-1608.