防磨梁与防磨格栅对循环流化床锅炉炉内传热的影响  

Influence of anti-wear beam and grid on heat transfer in circulating fluidized bed boiler

作　　者：陈翰 黄中 张缦 曹云俊 张勇 杜鑫 王宏伟 马有福[1] CHEN Han;HUANG Zhong;ZHANG Man;CAO Yunjun;ZHANG Yong;DU Xin;WANG Hongwei;MA Youfu(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Shanxi Jingneng Lülin Power Generation Co.,Ltd.,Lüliang 033299,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]清华大学机械工程学院,北京100084 [3]山西京能吕临发电有限公司,吕梁033299

出　　处：《上海理工大学学报》2024年第4期392-399,共8页Journal of University of Shanghai For Science and Technology

基　　金：国家重点研发计划资助项目(2022YFB4100300)。

摘　　要：循环流化床(circulating fluidized bed,CFB)锅炉普遍存在炉膛水冷壁磨损严重的问题。为提高运行可靠性,目前一般通过加装防磨梁或防磨格栅实现主动防磨,但该方式会引起流场变化,并对锅炉运行参数以及炉内传热造成影响。因此,建立循环流化床锅炉全炉膛水冷壁传热计算模型,提出加装防磨梁、防磨格栅后的边壁区颗粒浓度及传热面积修正系数计算方法,利用该模型对某440 t/h CFB锅炉炉内传热特性进行计算。结果显示:水冷壁加装防磨梁后,传热系数和传热能力有所下降,下降幅度和防磨梁数量有关,采用6道和12道防磨梁时,传热系数分别下降0.32%和2.89%,传热量分别下降3.28%和8.68%;比较而言,防磨格栅对炉内传热系数和传热能力影响较小,加装与防磨梁相同数量的防磨格栅时,表现出了一定的传热强化效果,传热量略有上升,当防磨格栅加装数量增加至30道时,传热系数下降5.76%,传热量上升1.59%。防磨格栅在降低水冷壁磨损的同时,对锅炉运行造成的影响较小,优于防磨梁。该模型可对CFB锅炉防磨技术的选用以及设计方案优化提供理论参考。Severe water wall wear are common in circulating fluidized bed(CFB)boilers.Active wear protections are generally achieved by installing anti-wear beams or anti-wear grids at present,but these methods will cause changes in the flow field and affect the boiler operating parameters and heat transfer in furnace.Therefore,the calculation model for whole furnace water wall heat transfer of CFB boiler was established,and the calculation method,which was suitable for CFB boilers with anti-wear devices,for particle concentration and heat transfer area correction coefficient in the side wall area was proposed.At last heat transfer characteristics in the furnace of a 440 t/h CFB boiler were calculated by using the model.The results show that the heat transfer coefficient and heat transfer capacity decrease after the water wall is installed with anti-wear beams,and the decrease is closely related to the number of antiwear beams.Specifically,when 6 and 12 anti-wear beams were used,the heat transfer coefficient decreased by 0.32%and 2.89%,and the heat transfer decreased by 3.28%and 8.68%,respectively.Comparatively speaking,the installation of anti-wear grid has less effect on the heat transfer coefficient and heat transfer capacity than anti-wear beam.A certain heat transfer enhancement effect was exhibited and heat transfer quantity increased slightly when the same number of grids as beams were installed.When the number of anti-wear grids increased to 30,the heat transfer coefficient decreased by 5.76%and the heat transfer increased by 1.59%.Anti-wear grid has less impact on boiler operation while reducing wear of water wall,which is better than anti-wear beam.The model can provide a theoretical reference for the selection of CFB boiler anti-wear technology and the design optimization.

关 键 词：循环流化床锅炉 防磨梁 防磨格栅 传热系数 传热量 

分 类 号：TK22[动力工程及工程热物理—动力机械及工程]