切向进气口对横风条件下自然干式通风冷却塔性能的影响

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-11-16 DOI:10.1016/j.tsep.2024.103036

Behzad Zakeri , Morteza Khashehchi , Pooyan Rahmanivahid , Milad Heidari

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引用次数: 0

摘要

横风会对为火力发电厂服务的自然吸风干式冷却塔（NDDCT）的性能产生负面影响。这反过来又降低了火力发电厂的效率，因为通过冷却塔排到环境空气中的热量减少了。这是由于横风和冷却塔结构之间的相互作用造成的。这种现象导致塔内产生一级和二级涡流，分别位于塔的背风侧（下风侧）和迎风侧（上风侧）。本文对这一挑战进行了创新性的解释，旨在引导横风流通过热交换器上方的塔壳，以辅助浮力引起的羽流。特别是，利用横风通过塔的吸入口作为切向诱导漩涡源，帮助向上的气流及其在环境空气中的渗透，从而提高塔的性能，否则，塔的性能将大大降低。本文提出了两种独立的方法来定量评估拟议的设计。对小规模塔模型进行的 CFD 模拟显示，当横向风通过塔侧壁热交换器上方的开口进入塔壳时，塔的性能（在自然气流阻塞和出口流速方面）将得到显著改善。模拟结果与在风洞中对相同模型（有无侧开口）进行测试所收集的实验数据进行了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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On the effect of a tangential intake on the performance of natural dry draft cooling towers in crosswind conditions

Crosswind has a negative effect on the performance of natural draft dry cooling towers, NDDCTs, serving thermal power plants. This, in turn, lowers the efficiency of the thermal power plant as less heat can be rejected to the ambient air through the tower. This occurs due to interaction of cross wind and cooling tower structure. This phenomenon leads to generation of primary and secondary vortices inside the tower which located in leeward side (downwind side) and windward side (upwind side) of the tower, respectively. In an innovative interpretation of the challenge, this paper aims at directing the crosswind flow through the tower shell above the heat exchangers to assist the buoyancy-induced plume. In particular, the intake of the crosswind through the tower is utilized as a tangentially-induced swirl source to help the upward draft, and its penetration in the ambient air, enhancing the tower performance which otherwise would have been significantly deteriorated. Two independent approaches are presented to assess the proposed design quantitatively. CFD simulation of a small scale tower model has revealed significant performance improvement (in terms of natural draft blockage and outlet flow velocity) when the crosswind is allowed to penetrate the tower shell, through an opening on the tower side-wall, above the heat exchangers. Results of the simulations have been validated against the experimental data collected using the tests ran on an identical model, with and without the side opening, in a wind tunnel.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.