大型循环流化床锅炉炉膛颗粒速度的光学测量  

Optical Measurement on Particle Velocity in a Large-Scale Circulating Fluidized Bed Boiler Furnace

作　　者：周星龙 孙平 谢建文 杨斌[2] 高胜斌[3] 

机构地区：[1]神华国华(北京)电力研究院有限公司,北京100025 [2]上海理工大学,上海200093 [3]上海发电设备成套设计研究院,上海200240

出　　处：《中国电力》2015年第12期59-63,共5页Electric Power

基　　金：国华电力研究院科技项目(JS-ZC-2013-06)

摘　　要：循环流化床锅炉炉膛内的颗粒速度分布对炉内燃烧、传热和受热面磨损均具有重要影响。在一台330MW循环流化床锅炉炉膛水冷壁上开设测孔．利用水冷激光光纤测枪结合互相关计算对炉膛内的颗粒轴向速度进行了测量，研究了炉膛近水冷壁区的颗粒轴向速度水平分布、“环-核”边界层厚度、颗粒团贴壁下滑速度以及气固相滑移速度。结果表明，炉膛贴壁面位置颗粒轴向速度为负值，随着与壁面距离的增加．颗粒轴向速度逐渐转为正向．颗粒由下降流过渡到上升流动。颗粒“环-核”边界层厚度在0．1～0．2m．且炉膛下部测点的边界层边界厚度略大于炉膛上部测点。颗粒团贴壁下滑速度均小于1m／8．炉膛中心区气固相滑移速度为2．05．2．73m／s．大于单颗粒终端速度。Distribution of particle velocity in the circulating fluidized bed boiler furnace has important influence on issues of combustion, heat transfer and abrasion. Experimental measuring holes are set on the water walls of a 330 MW circulating fluidized bed boiler furnace. A water cooled optical fiber probe is used to measure the local particle axial velocity in the furnace. Horizontal distribution of particle axial velocity near the water wall, boundary layer thickness, downward velocity of cluster and relative velocity of gas and particle are studied. Results show that negative particle axial velocity exists on the water wall. Particle axial velocity increases with the increment of distance to the water wall. Particle axial velocity is positive in the core region of furnace. The boundary layer thickness is about 0.1-0.2 m. The boundary layer thickness increases slightly with the increment of distance to the top of furnace. Downward velocity of cluster is less than 1 m/s. The relative velocity of gas and particle （about 2.05-2.73 m/s） is higher than the particle terminal velocity.

关 键 词：循环流化床锅炉 光纤测枪 互相关方法 颗粒速度 

分 类 号：TM621.2[电气工程—电力系统及自动化]