多流程卧式循环流化床气固流动的传热特性  

Gas-Solid Convective Heat Transfer in the Multi-Pass Horizontal Circulating Fluidized Bed Furnaces

作　　者：丛堃林 李清海[1] 韩峰 黄润华 张衍国[1] Cong Kunlin;Li Qinghai;Han Feng;Huang Runhua;Zhang Yanguo(Department of Energy and Power Engineering,Tsinghua University,Tsinghua University-University of Waterloo Joint Research Center for Micro/Nano Energy ＆ Environment Technology,Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Beijing 100084,China;State Grid Energy Research Institute Co.,Ltd.,Beijing 102209,China;Guangzhou International Engineering Consulting Corp.,Guangzhou 510000,China)

机构地区：[1]清华大学能源与动力工程系,清华大学-滑铁卢大学微纳米能源环境联合研究中心,热科学与动力工程教育部重点实验室,北京100084 [2]国网能源研究院有限公司,北京102209 [3]广州市国际工程咨询公司,广州510000

出　　处：《燃烧科学与技术》2018年第4期315-322,共8页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2017YFB0603901)

摘　　要：为了研究多流程循环流化床内独特的流动结构和传热规律,搭建了多流程循环流化床冷态实验系统,分别以80~120目、120~200目两种粒度分布的玻璃珠为物料,根据对流传热与热平衡理论,利用自制的横掠单管与壁面传热测量装置,在冷态条件下测量了多流程循环流化床主燃室(密相区/稀相区)、副燃室及燃尽室内的气固横掠单管传热及冲刷壁面传热的传热系数.实验发现,床内传热系数受风速影响较小,但受物料粒径、物料浓度等的影响较大.当物料粒径分布在120~200目时,主燃室密相区、稀相区、副燃室和燃尽室的单管传热系数之比为4.0∶1.5∶1.3∶1.0,壁面传热系数之比为1.8∶1.2∶1.1∶1.0;80~120目时的比例分别为3.3∶1.4∶1.3∶1.0和2.3∶1.4∶1.2∶1.0.冷态实验结果和实际运行锅炉的设计数据比较表明,该研究成果可以指导多流程循环流化床锅炉的设计和运行.A lab-scale cold-state test bench was built to study the heat transfer characteristics of gas-solid flow in a multi-pass horizontal circulating fluidized bed（MPHCFB）.In the study,glass beads were used as bed material,which consist of two particle size distributions of 80—120 mesh and 120—200 mesh.The heat transfer coefficients of sweeping across a single tube and flushing on wall in primary chamber（dense/dilute phase area）,secondary chamber and burnout chamber of the MPHCFB were measured by immersed tube and probes based on convection heat transfer and thermal balance.The result indicated that the effect of gas velocity on heat transfer coefficient was less pronounced,but material size and bed bulk density exhibited a great influence on the heat transfer characteristics within bed.The ratio is 4.0∶1.5∶1.3∶1.0,which stands for the heat transfer coefficient of a single tube in the primary chamber（dense/dilute phase area）,secondary chamber and burnout chamber,and the heat transfer coefficient flushing on wall is 1.8∶1.2∶1.1∶1.0 for the bed material of 120—200 mesh.For the bed material of 80—120 mesh, the ratio of heat transfer coefficient is 3.3 ∶ 1.4 ∶ 1.3 ∶ 1.0 and 2.3 ∶ 1.4 ∶ 1.2 ∶ 1.0,accordingly.A comparison between the tested results and real boiler design shows that the results of this study can serve as a guidance for the design and operation of MPHCFB boilers.

关 键 词：多流程卧式循环流化床 气固流动 传热系数 流化风速 物料浓度 物料粒径 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]