挡风板纵向间隔悬挂对湿式冷却塔热力特性影响的数值模拟

doi:10.3969/j.issn.1000-7229.2016.01.018

摘要/Abstract

摘要：

在我国北方地区，自然通风逆流湿式冷却塔在冬季运行时容易出现结冰现象，需要在冷却塔的进风口处加装挡风板。在电厂实际运行中，常出现为了防止冷却塔塔内结冰而过量悬挂挡风板的情况，导致机组经济性降低。为了提高冷却塔加装挡风板防冻的可行性，提出了一种新型纵向间隔的挡风板悬挂方式，建立了600 MW机组冷却塔的传热传质模型，利用Fluent软件模拟并分析了纵向间隔加装挡风板后，挡风面积对塔内不同特征面最低水滴温度的影响，找到了在不同环境温度下刚好可以防止塔内结冰的最佳挡风面积。结果表明：纵向间隔加装挡风板后，塔内最低水滴温度随挡风面积的增加而升高；当环境温度分别为264.15、261.15和258.15 K时，分别在第1层加装挡风板后留45个纵向进风口、第1、2层加装挡风板后留72个纵向进风口以及第1、2、3层加装挡风板后留90个纵向进风口刚好可以防止塔内结冰，对应的最佳挡风面积分别为848.95、1 578.79以及1 864.16 m²。

关键词: 冷却塔, 数值模拟, 热力特性, 防冻, 挡风面积

Abstract:

In the north of China, water freezing phenomenon occurs easily during the operation of natural draft counter-flow wet cooling towers in winter. It is necessary to install windshield boards at the air inlet of cooling tower. During the actual operation of power plants, it often appears the situation that the number of windshield boards is over large in order to avoid water freezing in cooling tower, which decreases the economics of unit. In order to improve the feasibility of installing windshield boards to avoid water freezing, we propose a new installation method of spaced longitudinal windshield board, and establish a heat and mass transfer model of cooling tower in a 600 MW unit. With using Fluent, we simulate and analyze the influence of the installing area of windshield boards on the minimum water droplet temperature on different characteristic planes after windshield board installation, and find the optimal installing area of windshield boards at different ambient temperatures. The results indicate that, the lowest water droplet temperature in the tower increase with the installing area increase of windshield boards；when the ambient temperatures are 264.15 K, 261.15 K and 258.15 K respectively；the cooling tower can avoid water freezing with windshield boards installed at a regular longitudinal spacing at the first layer with 45 longitudinal air inlets, the first two layers with 72 longitudinal air inlets and the first three layers with 90 longitudinal air inlets respectively, the corresponding optimal installing area of windshield boards are 848.95 m², 1578.79 m² and 1864.16 m²respectively.

Key words: cooling tower, numerical simulation, thermodynamic performance, anti-freezing, installing area of windshield boards

中图分类号:

TM 621.7

李永华，刘娟，汤金明. 挡风板纵向间隔悬挂对湿式冷却塔热力特性影响的数值模拟[J]. 电力建设, 2016, 37(1): 119-124.

LI Yonghua, LIU Juan,TANG Jinming. Numerical Simulation on Influence of Windshield Boards Installed at a Regular Longitudinal Spacing on Wet Cooling Tower Thermal Performance[J]. Electric Power Construction, 2016, 37(1): 119-124.

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