布风板开孔率对逆流烟气余热回收塔流场均匀性影响研究  

Study on the influence of distribution plate opening ratio on the uniformity of flow field of low-temperature flue gas counter flow waste heat recovery tower

作　　者：潘晓伟 彭烁[2] 李硕 周贤[2] 王长军[1] 刘峻 王瑞元 PAN Xiaowei;PENG Shuo;LI Shuo;ZHOU Xian;WANG Changjun;LIU Jun;WANG Ruiyuan(Huaneng Beijing Thermal Power Co.,Ltd.,Beijing 102209,China;STATE KEY Laboratory of Coal-Based Clean Energy,Beijing 102209,China)

机构地区：[1]华能北京热电有限责任公司,北京100023 [2]中国华能集团清洁能源技术研究院有限公司,北京102209

出　　处：《电力科技与环保》2022年第5期407-413,共7页Electric Power Technology and Environmental Protection

基　　金：国家重点研发计划(2017YFB0601901)。

摘　　要：烟气余热回收塔通过塔内烟气与水进行直接接触换热,回收电厂烟气显热以及水蒸气汽化潜热,从而降低机组排烟温度,同时回收烟气中的冷凝水。余热回收塔内空气动力场的均匀性会直接影响其冷却性能。以某燃机电厂为研究对象,对余热回收塔布风板开孔率、以及布置进口导流板对塔内空气动力场均匀性的影响进行了模拟研究,研究结果表明:布风板开孔率从25%降到15%后余热回收塔内流场均匀性得到改善,在布风板V型板出口,形成多股较小气流,起到整流均布作用;在布风板开孔率降到15%基础上继续增加入口导流板,余热回收塔内流场均匀性稍有改善;减小布风板开孔率会增加余热回收塔的流动损失,在布风板开孔率降到15%基础上继续增加入口导流板,余热回收塔流动损失会略有增加。所述流场优化措施和方法对同类机组具有一定的参考意义。The packed waste heat absorptio n tower can recover the sen sible heat of the flue gas and late nt heat of vaporization through the gas-water heat exchange process in the tower.Then the exhaust temperature is reduced,and a large amount of condensed water is recovered.The uniformity of the aerodynamic field in the tower greatly affects the cooling performance of the waste heat recovery tower.In this paper,the aperture ratio of the air distribution plate and the influence of the inlet deflector on the uniformity of the aerodynamic field in the tower are numerically simulated.The results show that,if the aperture ratio of the air distribution plate is reduced from 25%to 15%,the uniformity of the flow field in the cooling tower is improved.Multiple smaller airflows are formed at the outlet of the V-shaped plate of the air distribution plate,which plays a role of rectification and uniform distribution.When the opening rate of the air distribution plate is reduced to 15%,the uniformity of the flow field in the cooling tower is slightly improved if continuing increasing the inlet baffle.If the air distribution plate is reduced,the opening rate of the cooling tower and the flow loss of the cooling tower will be increased.The flow loss of the cooling tower will slightly increase as the increasing of the inlet deflector.

关 键 词：余热回收塔 流场 均匀性 布风板 数值模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]