中国电力2018，Vol.51Issue(2)：162-168,7.DOI:10.11930/j.issn.1004-9649.201611005
暖风器集箱系统并联管组流量偏差因素的研究
Study on the Factors for Parallel Pipeline Flow Deviation in the Air Heater Collecting Headers
摘要
Abstract
The low temperature economizer and air heater combined cycle system can improve the efficiency of the power plant boiler effectively and avoid blockage of the air heater system.Its application on the boilers in some power plants has been proved positive.However,the problem of uneven flow distribution is common in practice,which may result in the cracking of the heat exchanger tubes in winter in northem China,and harm the operation of the equipments.To better solve this problem,based on the mechanism of flow distribution of the working fluid in the air heater,this paper proposes a numerical calculation model on FLUENT software platform and a hydrodynamic calculation model on Visual Basic 6.0 platform.Results from the two models are compared.The influence of the heat load,the gravity and velocity of the working,the spacing between the heat exchanger tubes,and the location of collecting headers on the flow distribution in the heat exchanger tubes is analyzed.It is found that the uneven flow distribution is aggravated with the increase of the working fluid velocity.As the elevation of the collecting headers increases,the working fluid gravity plays a more important role and the uneven flow distribution is also aggravated.However,the increase of the velocity incurs a stronger forced flow in the collecting headers,which weakens the effect of the gravity.The coupled effect of the heat load and the gravity is the major cause of the uneven flow distribution in the air heater.Based on the calculation results,several schemes are proposed to prevent the uneven flow distribution.The results of this paper provide some solid technical backup for a better design of an air heater and solve the problem of tube cracking inside the air heaters due to low temperature.关键词
电站锅炉/暖风器/流量不均/重力/热负荷Key words
power plant boiler/air heater/uneven flow/gravity/heat load分类
信息技术与安全科学引用本文复制引用
徐党旗,侯逊,姬海民,张知翔,周飞,邹小刚,赵治平..暖风器集箱系统并联管组流量偏差因素的研究[J].中国电力,2018,51(2):162-168,7.基金项目
国家自然科学基金资助项目(51406166) （51406166）
国家科技部科技支撑计划项目(2014BAA07B04).This work is supported by National Natural Science Foundation of China (No.51406166) （2014BAA07B04）
National Key Technology Research and Development Program of the Ministry of Science and Technology of China (No.2014BAA07B04). （No.2014BAA07B04）
