Article(id=1215700879802553051, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700878661702357, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202401005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1704643200000, receivedDateStr=2024-01-08, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1767775276375, onlineDateStr=2026-01-07, pubDate=1719244800000, pubDateStr=2024-06-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1767775276375, onlineIssueDateStr=2026-01-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1767775276375, creator=13701087609, updateTime=1767775276375, updator=13701087609, issue=Issue{id=1215700878661702357, tenantId=1146029695717560320, journalId=1210938733613449225, year='2024', volume='53', issue='6', pageStart='1', pageEnd='150', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1767775276102, creator=13701087609, updateTime=1767775427616, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1215701514199417515, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700878661702357, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1215701514199417516, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1215700878661702357, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=122, endPage=131, ext={EN=ArticleExt(id=1215700880037434080, articleId=1215700879802553051, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Effect of low wind resistance streamlined wind deflectors on performance of naturally ventilated wet cooling towers, columnId=1211002405299294959, journalTitle=Thermal Power Generation, columnName=Thermal energy science research, runingTitle=null, highlight=null, articleAbstract=

In order to improve the flow field structure of rain area in cooling tower and further increase the ventilation, on the basis of the existing flat plate type wind guide plate, this paper proposes a streamline wind guide plate with low wind resistance that can be arranged in the rain area. Under the design condition, by taking the conventional cooling tower and the reformed tower with flat plate-type air guide plate arranged at each height as the reference objects, the influences of the low wind resistance streamline air guide plate on ventilation, flow field structure and temperature distribution of the whole tower are analyzed, at five different arrangement heights (1/6, 1/3, 1/2, 2/3, 5/6 air intake height). The results show that, with the rise of the height of the air guide plate arrangement, the air distribution in each region of the tower has changed, which has a significant effect on the packing heat exchange in inner zone, so that the cooling performance of the whole tower improves at first and then declines. When arranging the streamlined wind guide plate at 2/3 height of the air inlet, the ventilation increment and the average temperature reduction at the bottom of the filler area reaches the optimal value, and the improvement effect of the cooling tower performance is the best. Compared with the conventional cooling tower, the circulating water temperature drop and the ventilation increases by 2.65% and 2.78%, respectively. In addition, the circulating water temperature drop increases by 1.2% after the tower is retrofitted with a low wind resistance streamlined air guide, compared with the flat plate with an optimal arrangement height.

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为改善冷却塔雨区流场结构,进一步增大通风量,在已有平板型导风板基础上,提出一种布置在雨区的低风阻流线型导风板。设计工况下,以常规冷却塔和在各高度布置平板型导风板的改造塔为参考对象,分析5种不同布置高度(1/6、1/3、1/2、2/3、5/6进风高度)下低风阻流线型导风板对整塔通风量、塔内流场结构和温度分布等参数的影响。结果表明:随着导风板布置高度的升高,塔内各区域的空气分配发生了变化,对内区填料换热产生了明显影响,使整塔冷却性能呈现出先提升后下降的趋势;在进风口高度2/3处布置流线型导风板时,通风量增量与填料区底部平均温度减量达到最优值,冷却塔性能改善效果最佳,此时相较于常规冷却塔,循环水温降相对增长2.65%,通风量相对增长2.78%。此外,相较于最佳布置高度的平板型导风板,采用低风阻流线型导风板改造后循环水温降相对增长1.2%。

, correspAuthors=null, authorNote=null, correspAuthorsNote=
刘江(1980),男,博士,讲师,主要研究方向为环境流体力学领域内的气固两相流实验及数值模拟,
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杨繁昌(1999),男,硕士,主要研究方向为气液两相流数值模拟,

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杨繁昌(1999),男,硕士,主要研究方向为气液两相流数值模拟,

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杨繁昌(1999),男,硕士,主要研究方向为气液两相流数值模拟,

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tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Fig.13, caption=Velocity and temperature distribution cloud of flat plate type air guide plate, figureFileSmall=rwAY6X+aOWX3c8EnAHBAbg==, figureFileBig=gkjaiSIBHc2e2UzmB5icaQ==, tableContent=null), ArticleFig(id=1215700890699354320, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=图13, caption=平板型导风板速度、温度分布云图, figureFileSmall=rwAY6X+aOWX3c8EnAHBAbg==, figureFileBig=gkjaiSIBHc2e2UzmB5icaQ==, tableContent=null), ArticleFig(id=1215700890800017620, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.1, caption=

Related parameters of the cooling tower

, figureFileSmall=null, figureFileBig=null, tableContent=
项目数值
塔顶标高/m102.60
出口直径/m48.71
进风口标高/m7.18
进风口直径/m76.76
填料层底部标高/m7.84
填料层厚度/m1.00
淋水面积/m24 500.00
), ArticleFig(id=1215700892100251869, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表1, caption=

冷却塔相关参数

, figureFileSmall=null, figureFileBig=null, tableContent=
项目数值
塔顶标高/m102.60
出口直径/m48.71
进风口标高/m7.18
进风口直径/m76.76
填料层底部标高/m7.84
填料层厚度/m1.00
淋水面积/m24 500.00
), ArticleFig(id=1215700892247052515, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.2, caption=

Naming of each layout

, figureFileSmall=null, figureFileBig=null, tableContent=
未布置导风板1/6进风高度1/3进风高度1/2进风高度2/3进风高度5/6进风高度
布置1布置2布置3布置4布置5布置6
), ArticleFig(id=1215700892339327211, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表2, caption=

各布置方式命名

, figureFileSmall=null, figureFileBig=null, tableContent=
未布置导风板1/6进风高度1/3进风高度1/2进风高度2/3进风高度5/6进风高度
布置1布置2布置3布置4布置5布置6
), ArticleFig(id=1215700892452573426, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.3, caption=

Comparison between simulated and measured water temperature of outlet tower

, figureFileSmall=null, figureFileBig=null, tableContent=
循环水流量/(t·h–1相对湿度/
%
模拟温降/
实测温降/
相对误差/
%
设计工况30 08279.09.008.920.89
实测工况27 64531.88.658.690.46
33.68.688.720.45
35.58.648.560.93
16 58439.410.7310.972.18
43.810.4910.671.65
47.410.3610.632.47
), ArticleFig(id=1215700892540653815, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表3, caption=

出塔水温模拟值与现场实测值对比

, figureFileSmall=null, figureFileBig=null, tableContent=
循环水流量/(t·h–1相对湿度/
%
模拟温降/
实测温降/
相对误差/
%
设计工况30 08279.09.008.920.89
实测工况27 64531.88.658.690.46
33.68.688.720.45
35.58.648.560.93
16 58439.410.7310.972.18
43.810.4910.671.65
47.410.3610.632.47
), ArticleFig(id=1215700892649705723, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.4, caption=

Temperature drop and difference of circulating water in each arrangement

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
tall9.008.669.139.159.259.08
Δtall0–0.340.130.150.250.08
), ArticleFig(id=1215700892725203199, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表4, caption=

各布置方式下循环水温降及差值

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
tall9.008.669.139.159.259.08
Δtall0–0.340.130.150.250.08
), ArticleFig(id=1215700892821672194, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.5, caption=

Ventilation and difference of the whole tower

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
qv6 282.866 125.546 423.656 441.366 449.526 369.87
Δqv0–157.32140.79158.50166.6687.01
), ArticleFig(id=1215700892901363975, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表5, caption=

整塔通风量及差值

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
qv6 282.866 125.546 423.656 441.366 449.526 369.87
Δqv0–157.32140.79158.50166.6687.01
), ArticleFig(id=1215700892981055756, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=EN, label=Tab.6, caption=

Average temperature and the difference at bottom of the packing area

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
tfill-air304.42304.41303.63303.41303.29303.69
Δtfill-air0–0.01–0.79–1.01–1.13–0.73
), ArticleFig(id=1215700893052358928, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1215700879802553051, language=CN, label=表6, caption=

填料区底部平均温度及差值

, figureFileSmall=null, figureFileBig=null, tableContent=
布置1布置2布置3布置4布置5布置6
tfill-air304.42304.41303.63303.41303.29303.69
Δtfill-air0–0.01–0.79–1.01–1.13–0.73
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低风阻流线型导风板对自然通风湿式冷却塔的性能影响
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杨繁昌 1 , 刘江 1, 2 , 王明勇 3 , 翁培奋 1, 2 , 张宇琪 1
热力发电 | 热能科学研究 2024,53(6): 122-131
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热力发电 | 热能科学研究 2024, 53(6): 122-131
低风阻流线型导风板对自然通风湿式冷却塔的性能影响
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杨繁昌1 , 刘江1, 2 , 王明勇3, 翁培奋1, 2, 张宇琪1
作者信息
  • 1.上海电力大学能源与机械工程学院,上海 201306
  • 2.上海热交换系统节能工程技术研究中心,上海 200090
  • 3.西安热工研究院有限公司,陕西 西安 710054
  • 杨繁昌(1999),男,硕士,主要研究方向为气液两相流数值模拟,

通讯作者:

刘江(1980),男,博士,讲师,主要研究方向为环境流体力学领域内的气固两相流实验及数值模拟,
Effect of low wind resistance streamlined wind deflectors on performance of naturally ventilated wet cooling towers
Fanchang YANG1 , Jiang LIU1, 2 , Mingyong WANG3, Peifen WENG1, 2, Yuqi ZHANG1
Affiliations
  • 1.School of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 201306, China
  • 2.Shanghai Engineering and Technology Research Center for Energy Saving of Heat Exchange Systems, Shanghai 200090, China
  • 3.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China
出版时间: 2024-06-25 doi: 10.19666/j.rlfd.202401005
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为改善冷却塔雨区流场结构,进一步增大通风量,在已有平板型导风板基础上,提出一种布置在雨区的低风阻流线型导风板。设计工况下,以常规冷却塔和在各高度布置平板型导风板的改造塔为参考对象,分析5种不同布置高度(1/6、1/3、1/2、2/3、5/6进风高度)下低风阻流线型导风板对整塔通风量、塔内流场结构和温度分布等参数的影响。结果表明:随着导风板布置高度的升高,塔内各区域的空气分配发生了变化,对内区填料换热产生了明显影响,使整塔冷却性能呈现出先提升后下降的趋势;在进风口高度2/3处布置流线型导风板时,通风量增量与填料区底部平均温度减量达到最优值,冷却塔性能改善效果最佳,此时相较于常规冷却塔,循环水温降相对增长2.65%,通风量相对增长2.78%。此外,相较于最佳布置高度的平板型导风板,采用低风阻流线型导风板改造后循环水温降相对增长1.2%。

自然通风湿式冷却塔  /  冷却性能  /  流线型导风板  /  数值计算

In order to improve the flow field structure of rain area in cooling tower and further increase the ventilation, on the basis of the existing flat plate type wind guide plate, this paper proposes a streamline wind guide plate with low wind resistance that can be arranged in the rain area. Under the design condition, by taking the conventional cooling tower and the reformed tower with flat plate-type air guide plate arranged at each height as the reference objects, the influences of the low wind resistance streamline air guide plate on ventilation, flow field structure and temperature distribution of the whole tower are analyzed, at five different arrangement heights (1/6, 1/3, 1/2, 2/3, 5/6 air intake height). The results show that, with the rise of the height of the air guide plate arrangement, the air distribution in each region of the tower has changed, which has a significant effect on the packing heat exchange in inner zone, so that the cooling performance of the whole tower improves at first and then declines. When arranging the streamlined wind guide plate at 2/3 height of the air inlet, the ventilation increment and the average temperature reduction at the bottom of the filler area reaches the optimal value, and the improvement effect of the cooling tower performance is the best. Compared with the conventional cooling tower, the circulating water temperature drop and the ventilation increases by 2.65% and 2.78%, respectively. In addition, the circulating water temperature drop increases by 1.2% after the tower is retrofitted with a low wind resistance streamlined air guide, compared with the flat plate with an optimal arrangement height.

natural ventilation wet cooling tower  /  cooling performance  /  streamlined induced draft plate  /  numerical calculation
杨繁昌, 刘江, 王明勇, 翁培奋, 张宇琪. 低风阻流线型导风板对自然通风湿式冷却塔的性能影响. 热力发电, 2024 , 53 (6) : 122 -131 . DOI: 10.19666/j.rlfd.202401005
Fanchang YANG, Jiang LIU, Mingyong WANG, Peifen WENG, Yuqi ZHANG. Effect of low wind resistance streamlined wind deflectors on performance of naturally ventilated wet cooling towers[J]. Thermal Power Generation, 2024 , 53 (6) : 122 -131 . DOI: 10.19666/j.rlfd.202401005
冷却塔是热力发电厂冷端系统的重要设备[1],其热力性能的优劣对热力发电厂的发电效率和安全性有着重要影响[2-4]。通过分析常规冷却塔内部流动情况,普遍发现塔内中心区域由于通风量较少,气-水均匀性较低,导致冷却性能较差[5-8]
因此,许多研究人员提出了对冷却塔中心区域流场结构改造的方案。通过研究发现导风管可以将空气引流到冷却塔中心区域,并在提升塔内气-水分布均匀性[9-11]的基础上,在导风管水平侧增加一定数量的孔隙达到进一步优化通风的目的[12]。当有环境侧风影响时,将十字风墙与导风管相结合后发现对冷却性能依旧有较好改观[1-14]。考虑使用导风管对于进风而言会有较大的沿程阻力,所以周兰欣课题组提出采用多层导风板方案减少沿程阻力[15],该方案增加了进风垂直方向的速度分量,提高了换热效果。但该方案下安装间距过大时,空气流场不均匀;安装间距过小时,对空气的水平移动产生较大阻力。山东大学张政清等[16-18]提出在雨区布置分流直板,形成一种雨区干湿混合的冷却模式。发现布置分流直板后,塔内温度场、流场趋于均匀,显著提升了冷却性能。
根据流动阻力分析,导风板实质上是削弱了外围雨区的阻力,增大中心区域通风量,提升塔内空气动力场均匀性,从而优化了整塔冷却性能。然而导风板本身对流场而言即为一种局部阻力部件。因此,课题组思考是否能提出一种低风阻型导风板,在既保留改造流场能力的同时,又能显著降低其自身阻力。根据以上思路,本文以常规冷却塔雨区流场分布为出发点,提出一种低风阻流线型导风板结构,对比平板型导风板分析其对冷却塔性能的影响,并探讨最佳布置高度。
图1为自然通风逆流湿式冷却塔结构示意。循环水通过中央竖井送入配水系统后经过喷嘴喷淋在填料层顶部,形成一层水膜,然后在重力和表面张力的作用下离开填料,最终以水滴的形式落入下方的集水池中。与此同时,环境空气由进风口进入冷却塔内,依次穿过雨区、填料区和喷淋区,最终从塔顶的出口排出。在喷淋区、填料区和雨区,循环水与环境空气之间发生气液二相之间的传热传质。
本文选取某电厂实际运行的自然通风逆流湿式冷却塔作为研究对象,表1是该塔的相关参数。以此冷却塔的相关尺寸为基础,在雨区布置低风阻流线型导风板。
本文主要研究低风阻流线型导风板布置高度对冷却塔冷却性能的影响。为保证模拟的真实可靠[19],在模型中添加了外部大气环境组成,具体如图2所示。计算域为直径600 m,高度300 m的圆柱形空间,冷却塔位于计算域底部的中心位置。
本文依据常规冷却塔在设计工况下雨区的流线分布设计导风板结构。首先,选取流线起点的竖直位置,分别为冷却塔进风口高度的1/6、1/3、1/2、2/3、5/6处;其次,流线起点的水平位置为与冷却塔进风口相距1 m处,流线终点的位置为填料层底部;最后,将每个高度上的原始流线偏折角度α后,进行旋转得到流线型导风板。低风阻流线型导风板结构示意如图3所示。
针对此塔流线型导风板的最佳偏折角在5°~20°内,通过多次试算分析,确认最优偏折角为10°,因此选择此角度作为偏折角。为便于分析流线型导风板布置高度对冷却性能的影响,对原始冷却塔和不同流线型导风板布置高度的冷却塔进行命名(表2)。
在计算域中截取x=0 m截面为特征面,以x=0 m截面与填料层底面的交线为特征线。定义流线型导风板内径在竖直方向上投影形成的圆形范围为内区。内外区范围示意如图4所示。
实际应用中,若下落至流线型导风板上的循环水发生积聚,则会在导风板起点位置下落并形成水幕,这种情况则会增大雨区进风阻力,恶化冷却性能。而流线型导风板结构的底部存在凹槽区域,因此以循环水不发生积聚为准则,在凹槽区域最低点沿导风板周向布置一定数量的圆形孔洞用于排放落在导风板上的循环水[20]
以布置在进风口2/3高度的导风板为例,在其底部最低处,沿圆周方向均匀布置10个直径25 cm的圆形孔洞区域用于排放落在导风板上的循环水,以此避免形成水幕。将水柱简化为由导风板底部连接至集水池的圆柱体,以体现水柱对于冷却塔进风的阻力作用。计算结果显示,开孔前后(即有无水柱)冷却塔通风量相差4.28 kg/s,整塔循环水温降相差0.03 K。可近似认为水柱存在对于冷却塔通风影响微小,可以忽略。
湿空气的运动状态控制方程包括质量、动量、能量和组分守恒方程。这些方程可以用通用形式[21-22]表示为:
(ρμφ)=(Γφφ)+Sφ
式中:ρ为湿空气密度;μ为湿空气流速;φ为不同方程(如连续性方程、动量方程、能量方程、组分方程和湍流模型)对应的变量;Γφ为扩散系数;Sφ为方程的源项。在冷却塔内使用这些方程时,由于空气与水的换热在填料区、喷淋区和雨区存在差异,因此需要根据每个区域的换热特点,分别采用相应的公式进行计算,具体的公式可以参考文献[23]。
在冷却塔内,循环水作为离散相,以液滴下落的方式进行运动。在运动过程中,水滴不断进行传热和传质。阻力对水滴的影响体现在运动速度的变化上,而传热过程则会导致循环水温度的变化,传质过程则表现在淋水密度的变化。冷却水的控制方程可以表示为[24-25]
dφd(z)=Sφ
式中:φ分别为uwtwqz为竖直向上的坐标;Sφ为方程源项,均为负值,分别采用相对应的公式[25]计算。
冷却塔内的传热传质现象主要发生在喷淋区、填料区和雨区,包括接触传热和蒸发传热传质。接触传热的传热量可以表示为[25]
dQα=α(twt)dA
式中:α为接触传热系数;tw为循环水温度;t为空气温度;dA为接触面积。
蒸发传热传质可以分别用以下公式表示。
传质速率:
dSm=βx(χ''χ)dA
传热量:
dQβ=γwSmdA
式中:βx为传质系数;χ′′为水面饱和空气层的含湿量;χ为周围湿空气的含湿量;γw为水的汽化潜热。
当环境空气从雨区进风口进入冷却塔后,在上升的过程中会受到液滴阻力和填料层阻力的影响。阻力可以统一表示[25]为:
f=ξiρu22
式中:ξi为阻力系数,根据经验公式(与尺寸相关)进行计算;ρ为该处湿空气密度;u为流经该处的气流速度。
1)介质设置 循环水在填料区以水膜形式流动,雨区使用DPM模型[26],忽略碰撞变形等因素,对雨区的水滴粒径使用符合高斯分布的粒径设置。
2)边界条件设置 空气入口边界为速度入口。无风情况下,侧面为环境空气的入口,速度大小为0 m/s。空气入口温度设为环境温度。出口边界使用压力出口条件,压力设置为参考压力。计算域底面、流线型导风板和冷却塔壁面设置为壁面。冷却塔入口和出口设置为内部边界,与外部环境连接。
3)运行设置 根据当地环境工况设置运行温度、压力、空气密度和重力加速度,参考点位于地面进风口处。
4)求解设置 采用Boussinesq近似,使用标准k-ε[5]模型封闭控制方程;对流项采用二阶迎风格式离散化;使用合适的松弛因子提高求解的收敛速度;模型计算使用SIMPLE算法;能量方程的收敛精度设为10–6,其他方程的收敛精度设为10–4
鉴于冷却塔内气-水热质交换主要发生在喷淋区、填料区和雨区,所以在网格划分时特别加密了这些区域。对100万、140万、180万和220万网格数量的数值计算结果进行比较后发现,在相同工况下循环水出塔温度随网格数量增加逐渐趋于稳定。最终选择网格单元数量为180万的网格进行后续计算。
为验证计算模型对冷却塔变工况模拟的适应性,进一步验证模型的准确性。本文计算并对比了未布置导风板的原塔在不同循环水流量和不同相对湿度下循环水温降的模拟值和现场实测值。其中6组实测工况是在其冷却性能已下降15%时所测数据,结果见表3。由表3可见,模拟值与实测值之间的最大误差均不超过2.5%,验证了仿真模型的准确性。
本文选取设计工况作为改造前后冷却性能的对比工况。冷却塔的设计工况如下:进塔空气干球温度28.76 ℃,进塔空气湿球温度25.80 ℃,相对湿度79%,大气压力100 000 Pa,循环水量30 082 m3/h,冷却塔设计出塔水温为31.9 ℃。
表4给出了6种布置方式在设计工况下,整塔循环水温降tall以及各布置方式与布置1(未布置导风板的原塔)整塔循环水温降的差值Δtall表4的结果表明:在设计工况下,布置2的整塔冷却性能不仅没有提升,反而下降;布置3、布置4、布置5、布置6的整塔冷却性能均有不同程度的提升,其中布置5的循环水温降提升最高为0.25 K。
图5为各布置方式下冷却塔内部速度分布云图,其反映了塔内空气流动情况。布置1(图5a))显示常规冷却塔在运行过程中,塔外空气由进风口进入,沿径向流动至冷却塔中心区域。在这一过程中,由于空气在雨区受到雨滴阻力的作用,空气速度逐渐减小。
布置导风板后,在其下方形成了无水滴的进风通道,不同的布置高度形成的通道不同,则对进风阻力有着不同的影响。在布置2(图5b))中,由于导风板位置过低,使原本能够进入塔中心区域的气流改向上方流动,使中心区域的低速区明显增大。而在剩余布置方案中,可以明显看到高速区域向内区的延展;这是由于流经导风板下方的空气没有受到水滴阻力的作用,在进入内区范围后,气-水间经过充分换热,湿空气密度降低,使内区范围压强降低,促进空气进入中心区域。
随布置高度升高,内区范围的高速区域逐渐增大,其中布置5(图5e))的高速区域增大最为明显。在近壁面区域,低速区域随布置高度的升高逐渐减少,但是布置6(图5f))由于布置高度距离进风口上沿较近,产生了较大范围的涡流从而削弱空气速度。在外区范围中,由于导风板的分流作用,使得外区的平均风速随布置高度升高逐渐下降。
填料区各范围平均风速如图6所示,图中vinvoutvall分别为布置2至布置6填料底部内区范围平均风速、外区范围平均风速和整个填料区底面平均风速。图6显示:随布置高度的升高,vin先上升再下降并在布置3(进风口高度1/3)处取得最大值;vout呈现逐渐下降的趋势;vall随着布置高度的升高先上升再下降,在布置5处达到最大值。
表5为各布置方式下整塔通风量qv以及各布置方式与布置1整塔通风量的差值Δqv。在改造塔中,随着布置高度的升高,冷却塔通风量增量呈现先增大后下降的趋势,并在布置高度为进风口高度2/3,即布置5时取得最大值,增量为166.66 kg/s。
图7为各布置方式下冷却塔内部温度分布云图,其反映了塔内各区域空气温度分布情况。布置1下,塔外空气在流动过程中不断从循环水中吸热,使得温度升高,因此冷却塔中心区域温度明显高于外围区域温度。并且由于填料区是循环水换热的主要区域,所以填料上方空气温度大于雨区空气温度。空气温度越高,与循环水之间的温差越小,气-水间传热传质能力越差。
加导流板后,布置2方案的中心高温区域并没有缩小,反而增大。这是由于导流板位置过低,使导风板下方压力升高,增大了进风阻力,削弱整塔通风量,所以当循环水流量不变时,空气温度自然升高。改造布置3至布置6中,由于大量干冷空气被导入内区,增强了内区循环水换热,所以中心高温区域明显缩减,在不同程度上优化了塔内区温度分布。在外区范围,由于受到空气流动的影响,弱化了换热过程,随布置高度的升高,外区空气温度逐渐升高。
表6为各布置方式下填料区底部空气平均温度tfill-air,以及各改造方式与布置1填料区底部平均温度的差值Δtfill-air表6数据表明,每种改造方式下的tfill-air都比常规塔低,并且随布置高度升高,tfill-air呈现先下降再上升的趋势。在布置高度为进风口高度2/3时,tfill-air取得相对最优值,相较于常规冷却塔可以降低1.13 K。
图8为各布置方式在填料区底面特征线Z轴上循环水温降Δt分布情况。图9为各布置下冷却塔填料区底部循环水平均温降。
图8可见,布置1近壁面区域和中心区域的循环水冷却效果较差。从填料层外侧到内侧,循环水温降呈现由高到低的变化趋势,表明了填料外侧的冷却能力大于填料内侧,这与常规冷却塔的实际冷却效果相符。
对于外区范围,由于导风板的分流作用,降低了外区平均风速,从而使得各个改造方案的循环水温降都高于布置1。对于内区范围,布置2中心区域的速度和温度场都被恶化,所以其内区范围循环水温降反而不如布置1;剩余改造方案,提高了内区平均风速,降低了内区空气温度,所以内区范围各个位置循环水温降都高于布置1。可以明显看出布置3在内区范围中对于循环水冷却效果优化最为明显,这是由于布置3内区范围空气风速最快和温度最低。
图9表现出整个填料区循环水温降幅度,在内外区综合影响下,布置2填料区底部循环水温降相对布置1呈现上升趋势,随着布置高度的升高,填料区底部循环水温降先上升再下降并在布置5处取得最优值。因此,虽然布置3在内圆范围内对于循环水温降优化效果最为明显,但是在整个填料区而言依旧是布置5的整体效果更好。
为对比2种型式导风板的优化效果,本文在各布置高度下施加平板型导风板后进行数值模拟并与流线型导风板的计算结果进行对比。图10为各布置高度下2种型式导风板优化后的循环水温降对比,图11为优化后冷却塔通风量对比,图12为优化后冷却塔填料层底部循环水温降对比,图13为平板型导风板在最低、最高布置高度时冷却塔速度、温度分布云图。
图10图13表明:与流线型导风板方案相似,当在1/6进风口高度布置平板型导风板时,冷却塔填料区换热性能恶化,整塔循环水温降劣于原塔。在剩余布置高度中,2种型式导风板均使填料区循环水的热质传递得到优化,但流线型导风板更佳(仅在5/6进风高度时效果基本相当);与流线型导风板不同,平板型导风板只有布置在2/3进风高度和5/6进风高度上才对整塔循环水温降有优化效果,其中5/6进风高度上达到最佳改善效果,整塔通风量增大了140.44 kg/s,整塔循环水温降增大了0.14 K。当布置高度较低时,虽然平板型导风板同样有驱使空气进入冷却塔中心区域的作用,但其对于流场结构破坏较大。首先是在导风板起点位置,空气会直接冲击导风板,这会增大局部损失,降低空气动能,其次在相同布置高度,不同型式的导风板对进风口上沿的速度影响有较大差异,平板型导风板会在该区域造成较大的低速区域,使该区域本就不理想的热质交换环境变得更差。因此,在2种型式导风板对比中,流线型导风板在各个高度上整体表现优秀,而平板型导风板在大多高度上改造效果甚至劣于原塔,表明其不适于进行工程改造。同时,平板型导风板的加入会导致水幕大范围出现,更不宜雨区进风。
本文在设计工况下,建立了4 500 m2某常规冷却塔和布置流线型或平板型导风板的冷却塔三维数值计算模型,计算分析流线型导风板布置高度对冷却塔换热效果的影响。主要结论如下。
1)流线型导风板的布置高度对冷却塔的冷却效果有着不同的影响。这种影响主要是由于流场结构变化后,使得空气速度温度场对填料区换热性能带来的变化。随着布置高度的升高,性能呈现先上升后下降的趋势。在布置高度为进风口高度2/3时取得相对最优值,在布置高度为进风口高度1/6时取得相对最差值。
2)当布置高度为进风口高度2/3时,与原始常规塔相比:填料层底部空气平均温度降低1.13 K,整塔通风量增大166.66 kg/s,相对增长2.65%,循环水温降增大了0.25 K,相对增长2.78%。
3)通过2种型式导风板性能对比,在各自最优布置高度下,布置流线型导风板相比于布置平板型导风板,循环水温降增大了0.11 K,相对增长1.2%。
  • 上海市2020年度“科技创新行动计划”社会发展科技攻关项目(20dz1205302)
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2024年第53卷第6期
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doi: 10.19666/j.rlfd.202401005
  • 接收时间:2024-01-08
  • 首发时间:2026-01-07
  • 出版时间:2024-06-25
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  • 收稿日期:2024-01-08
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Shanghai's 2020 Annual Science and Technology Innovation Action Plan: Social Development and Science & Technology Project(20dz1205302)
上海市2020年度“科技创新行动计划”社会发展科技攻关项目(20dz1205302)
作者信息
    1.上海电力大学能源与机械工程学院,上海 201306
    2.上海热交换系统节能工程技术研究中心,上海 200090
    3.西安热工研究院有限公司,陕西 西安 710054

通讯作者:

刘江(1980),男,博士,讲师,主要研究方向为环境流体力学领域内的气固两相流实验及数值模拟,
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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