大型CFB锅炉床压横向波动的机制研究  

Mechanism Study of Lateral Bed Pressure Wave of Large Scale CFB Boilers

作　　者：胡南[1] 李金晶[2] 刘雪敏[1] 杨海瑞[1] 吕俊复[1] 

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京市海淀区100084 [2]华北电力科学研究院有限责任公司,北京市西城区100045

出　　处：《中国电机工程学报》2013年第20期1-7,9,共7页Proceedings of the CSEE

基　　金：国家科技支撑计划项目(2012BAA02B01)~~

摘　　要：大型循环流化床(CFB)锅炉在低负荷运行时,较多存在沿宽度方向两侧床压交替大幅度波动的床压横向波动现象,严重影响锅炉的正常、安全运行。为了深入分析床压横向波动问题,在2台300MW亚临界单炉膛、三分离器循环流化床锅炉上进行测试。在50%负荷的工况下,炉膛发生了床压横向波动,波动周期分别为83和116s,波动幅度分别达到5和11kPa。运行数据分析表明:产生床压横向波动的原因并非外循环回路不均匀导致。提出了大尺度气固两相流动系统固有波动频率的概念,认为炉膛横向压力波动是由风–床系统的压力波动的共振引起的,并建立压力波动简化模型,模型计算能够较好的符合实验结果。建议通过流态重构和调整一次风管网结构来避免床压横向波动的发生。When large-scale circulating fluidized bed（CFB） boiler working under low load condition,severe lateral bed pressure wave often occurs and poses a serious threat to boiler stability and safety.In order to further analyze lateral bed pressure wave,testing works were carried out on two 300MW sub-critical CFB boilers.Under 50% percent load of the boiler,severe periodical pressure fluctuation happened.The periodical pressure fluctuations were over 5kPa and 11kPa,with a cycle of 83s and 116s respectively.From the test result,the external circle loops are not to be considered as the reason of lateral bed pressure wave.Based on the theory of air-bed system resonance,a large scale gas-solid flow self-fluctuation model was proposed.The model results are basically consistent with experiment data.Fluidization reconstruction and pipe modification will avoid lateral bed pressure wave.

关 键 词：大型循环流化床锅炉 床压横向波动 共振 流态重构 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]