Article(id=1236699938105651775, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236699937195479441, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202403057, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1711036800000, receivedDateStr=2024-03-22, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772781842017, onlineDateStr=2026-03-06, pubDate=1727193600000, pubDateStr=2024-09-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772781842017, onlineIssueDateStr=2026-03-06, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772781842017, creator=13701087609, updateTime=1772781842017, updator=13701087609, issue=Issue{id=1236699937195479441, tenantId=1146029695717560320, journalId=1210938733613449225, year='2024', volume='53', issue='9', pageStart='1', pageEnd='154', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772781841801, creator=13701087609, updateTime=1772781841801, updator=13701087609, preIssue=null, nextIssue=null, ext=null, issueFiles=null}, startPage=109, endPage=117, ext={EN=ArticleExt(id=1236699938827072065, articleId=1236699938105651775, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Optimization study on thermal storage performance of horizontal shell and tube latent heat thermal energy storage exchangers based on inner tube movement, columnId=1236699938319552915, journalTitle=Thermal Power Generation, columnName=Hydrogen storage technology, runingTitle=null, highlight=null, articleAbstract=

Latent heat thermal energy storage technology can realize recovery and supply of heat during solid-state hydrogen storage and release process, achieving self-thermal balance inside the solid-state hydrogen storage tank, and improve the hydrogen storage and release performance. For horizontal tube and shell latent heat thermal energy storage exchanger, a new movement method where the inner tube is placed eccentrically to rotate around the central axis is proposed. By the Fluent software, the user-defined function UDF is written using the dynamic mesh technique, and the influence of eccentric distance and rotation velocity of the inner tube on heat storage performance is focused. The results show that, compared with the conventional static arrangement of the central inner tube, the rotation movement of the eccentric inner tube can improve the heat storage performance significantly. The heat storage time reaches the shortest when the eccentric distance is 9 mm and the rotation velocity is 0.10 r/min, namely decreases by 92.16%, and the time average heat storage rate increases by 11.51 times. The heat storage time reduces by 13.57% when the eccentric distance is 9 mm and the rotation velocity is decreased from 0.30 r/min to 0.1 r/min, it decreases by 70.48% when the rotation velocity is 0.10 r/min and the eccentric distance is increased from 3 mm to 9 mm. The study results can provide a new idea for performance optimization of horizontal shell and tube latent heat thermal energy storage exchangers in hydrogen storage field.

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相变储热技术能够实现对固态储放氢过程热量的回收和供给,实现固态储氢罐内的自热平衡,提高储放氢性能。研究针对卧式管壳式相变储热器,提出了一种新型的内管偏心放置绕中心轴线旋转的运动方式,采用Fluent数值模拟软件,基于动网格技术编写了用户自定义函数UDF,重点研究了内管偏心距离与旋转速度对储热性能的影响。结果表明:与传统中心内管静止布置相比,偏心内管的旋转运动能够显著提高储热性能,当偏心距离为9 mm,旋转速度为0.10 r/min时,储热时间达到最小值,储热时间减少了92.16%,时间平均储热速率是内管静止布置的11.51倍;当偏心距离为9 mm,旋转速度由0.30 r/min减少至0.10 r/min时,储热时间减少了13.57%;当旋转速度为0.10 r/min,偏心距离由3 mm增至9 mm时,储热时间减少了70.48%。该研究结果可为卧式管壳式相变储热器在储氢领域的性能优化研究提供新思路。

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高明(1977),男,博士,教授,主要研究方向为高效储能及氢能利用技术,
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周少斌(2000),男,硕士研究生,主要研究方向为相变储热技术,

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周少斌(2000),男,硕士研究生,主要研究方向为相变储热技术,

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label=Fig.5, caption=Heat storage capacity Q and time average heat storage rate q¯ under different conditions, figureFileSmall=VsWETOkXWrvc5Sed/uPIvw==, figureFileBig=VaVRTIHvA41X+UsXuRPmYQ==, tableContent=null), ArticleFig(id=1236699948473971537, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, language=CN, label=图5, caption=不同工况储热量Q和时间平均储热速率q¯, figureFileSmall=VsWETOkXWrvc5Sed/uPIvw==, figureFileBig=VaVRTIHvA41X+UsXuRPmYQ==, tableContent=null), ArticleFig(id=1236699948557857623, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, language=EN, label=Fig.6, caption=Liquid fraction and heat storage capacity Q at different rotation velocities for eccentric distance of 9 mm, figureFileSmall=EOG9HU5EKvVwtRUuGWvuxQ==, figureFileBig=4MDRVnbTY0TXfKwLXM3cng==, tableContent=null), ArticleFig(id=1236699948666909537, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, 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Thermophysical properties of copper and RT35

, figureFileSmall=null, figureFileBig=null, tableContent=
参数RT35
凝固、熔化温度/K302.15/309.15
密度/(kg·m–3)8 960860(固体)/770(液体)
比热容/(J·(kg·K)–1)4002 000
相变潜热/(J·kg–1)170 000
热导率/(W·(m·K)–1)3850.2
热膨胀系数/K–10.000 6
动量黏度/(kg·(m·s)–1)0.023
), ArticleFig(id=1236699951267378111, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, language=CN, label=表1, caption=

铜和RT35的热物性参数

, figureFileSmall=null, figureFileBig=null, tableContent=
参数RT35
凝固、熔化温度/K302.15/309.15
密度/(kg·m–3)8 960860(固体)/770(液体)
比热容/(J·(kg·K)–1)4002 000
相变潜热/(J·kg–1)170 000
热导率/(W·(m·K)–1)3850.2
热膨胀系数/K–10.000 6
动量黏度/(kg·(m·s)–1)0.023
), ArticleFig(id=1236699951376430022, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, language=EN, label=Tab.2, caption=

Heat storage time under conditions with different eccentric distances and rotation velocities

, figureFileSmall=null, figureFileBig=null, tableContent=
旋转速度/(r·min–1)偏心距离/mm
3579
0.053 700.12 977.71 894.01 004.2
0.103 395.52 5891 736.31 002.2
0.203 167.82 360.31 617.11 134.2
0.303 042.12 268.41 476.51 159.5
0.402 931.92 169.41 351.91 146.5
), ArticleFig(id=1236699951447733196, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236699938105651775, language=CN, label=表2, caption=

不同偏心距离和旋转速度的储热时间

, figureFileSmall=null, figureFileBig=null, tableContent=
旋转速度/(r·min–1)偏心距离/mm
3579
0.053 700.12 977.71 894.01 004.2
0.103 395.52 5891 736.31 002.2
0.203 167.82 360.31 617.11 134.2
0.303 042.12 268.41 476.51 159.5
0.402 931.92 169.41 351.91 146.5
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基于内管移动的卧式管壳式相变储热器储热性能优化研究
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周少斌 1 , 曹红梅 2 , 付宁 2 , 张民 3 , 郭丰瑞 3 , 王晓龙 3 , 高明 1
热力发电 | 储氢技术 2024,53(9): 109-117
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热力发电 | 储氢技术 2024, 53(9): 109-117
基于内管移动的卧式管壳式相变储热器储热性能优化研究
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周少斌1 , 曹红梅2, 付宁2, 张民3, 郭丰瑞3, 王晓龙3, 高明1
作者信息
  • 1.山东大学能源与动力工程学院高效储能及氢能利用山东省工程研究中心,山东 济南 250061
  • 2.华能山东发电有限公司,山东 济南 250014
  • 3.华能国际发电有限公司日照电厂,山东 日照 276800
  • 周少斌(2000),男,硕士研究生,主要研究方向为相变储热技术,

通讯作者:

高明(1977),男,博士,教授,主要研究方向为高效储能及氢能利用技术,
Optimization study on thermal storage performance of horizontal shell and tube latent heat thermal energy storage exchangers based on inner tube movement
Shaobin ZHOU1 , Hongmei CAO2, Ning FU2, Min ZHANG3, Fengrui GUO3, Xiaolong WANG3, Ming GAO1
Affiliations
  • 1.Shandong Engineering Research Center for High-efficiency Energy Storage and Hydrogen Energy Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • 2.Huaneng Shandong Power Generation Co., Ltd., Jinan 250014, China
  • 3.Huaneng International Power Co., Ltd. Rizhao Power Plant‚ Rizhao 276800‚ China
出版时间: 2024-09-25 doi: 10.19666/j.rlfd.202403057
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相变储热技术能够实现对固态储放氢过程热量的回收和供给,实现固态储氢罐内的自热平衡,提高储放氢性能。研究针对卧式管壳式相变储热器,提出了一种新型的内管偏心放置绕中心轴线旋转的运动方式,采用Fluent数值模拟软件,基于动网格技术编写了用户自定义函数UDF,重点研究了内管偏心距离与旋转速度对储热性能的影响。结果表明:与传统中心内管静止布置相比,偏心内管的旋转运动能够显著提高储热性能,当偏心距离为9 mm,旋转速度为0.10 r/min时,储热时间达到最小值,储热时间减少了92.16%,时间平均储热速率是内管静止布置的11.51倍;当偏心距离为9 mm,旋转速度由0.30 r/min减少至0.10 r/min时,储热时间减少了13.57%;当旋转速度为0.10 r/min,偏心距离由3 mm增至9 mm时,储热时间减少了70.48%。该研究结果可为卧式管壳式相变储热器在储氢领域的性能优化研究提供新思路。

卧式管壳式相变储热器  /  固态储氢  /  内管移动  /  储热性能  /  数值模拟

Latent heat thermal energy storage technology can realize recovery and supply of heat during solid-state hydrogen storage and release process, achieving self-thermal balance inside the solid-state hydrogen storage tank, and improve the hydrogen storage and release performance. For horizontal tube and shell latent heat thermal energy storage exchanger, a new movement method where the inner tube is placed eccentrically to rotate around the central axis is proposed. By the Fluent software, the user-defined function UDF is written using the dynamic mesh technique, and the influence of eccentric distance and rotation velocity of the inner tube on heat storage performance is focused. The results show that, compared with the conventional static arrangement of the central inner tube, the rotation movement of the eccentric inner tube can improve the heat storage performance significantly. The heat storage time reaches the shortest when the eccentric distance is 9 mm and the rotation velocity is 0.10 r/min, namely decreases by 92.16%, and the time average heat storage rate increases by 11.51 times. The heat storage time reduces by 13.57% when the eccentric distance is 9 mm and the rotation velocity is decreased from 0.30 r/min to 0.1 r/min, it decreases by 70.48% when the rotation velocity is 0.10 r/min and the eccentric distance is increased from 3 mm to 9 mm. The study results can provide a new idea for performance optimization of horizontal shell and tube latent heat thermal energy storage exchangers in hydrogen storage field.

horizontal shell and tube latent heat thermal energy storage exchanger  /  solid-state hydrogen storage  /  inner tube movement  /  heat storage performance  /  numerical simulation
周少斌, 曹红梅, 付宁, 张民, 郭丰瑞, 王晓龙, 高明. 基于内管移动的卧式管壳式相变储热器储热性能优化研究. 热力发电, 2024 , 53 (9) : 109 -117 . DOI: 10.19666/j.rlfd.202403057
Shaobin ZHOU, Hongmei CAO, Ning FU, Min ZHANG, Fengrui GUO, Xiaolong WANG, Ming GAO. Optimization study on thermal storage performance of horizontal shell and tube latent heat thermal energy storage exchangers based on inner tube movement[J]. Thermal Power Generation, 2024 , 53 (9) : 109 -117 . DOI: 10.19666/j.rlfd.202403057
氢气作为一种能源载体,能够缓解可再生能源的间歇性和波动性问题[1-2]。氢能技术是未来我国长期发展的方向,氢气存储技术为氢能发挥战略意义提供支撑,是促进氢能技术快速发展的关键因素[3]
在各种储氢方式中,金属氢化物(metal hydride,MH)储氢具有高体积储氢密度、高安全性等优点,具有巨大的应用价值[4]。但金属氢化物储氢技术在储氢过程中释放的热量被冷却液吸收后耗散到空气中,导致储氢能耗的增加,是其发展的主要瓶颈[5]。储热技术能够将储氢过程中MH释放的热量储存,并在放氢过程释放,实现储放氢过程中热量的循环利用[6]。其中,相变储热作为一种利用物质相变潜热进行热量存储和释放的技术,因其高储热密度、良好的稳定性等优点取得广泛应用[7-9],利用相变材料(phase change material,PCM)对储氢过程进行热管理,能够解决金属氢化物储氢能耗增加的问题,达到节能减排的目的[10-12]
PCM固有的低导热性使其在储放热过程中的传热速率受到显著影响,针对相变储热技术的研究主要集中于相变材料和相变储热器两方面[13-14]。在相变储热器强化方面,根据是否需要额外消耗能量分为主动和被动强化方式,众多学者针对主动强化方式提出了相应的措施,并开展相关研究。Fathi和Kurnia等人[15-16]针对光滑内管旋转,Soltani等人[17]针对带有矩形翅片的内管旋转,分别研究了对PCM储放热过程的影响,证明光滑内管在中心位置处的自转仅能够促进紧邻内管处PCM的流动,矩形翅片内管旋转强化效果优于光滑内管。Li等人[18]提出了一种具有可移动光滑内管的卧式相变储热器,发现内管在储热器内的移动能够显著强化储热过程,储热时间减少了78.88%。Dai等人[19]针对立式储热器提出了一种翻转方式,通过改变固液两相PCM的位置提高了储放热效果,储放热总时间减少了14.93%。Farahani等人[20]提出了一种带有振动圆柱体的板式储热器,结果显示通过振动圆柱使储热时间减少12.84%。Xu等人[21]研究了磁场对相变材料储热过程的影响,发现磁场方向的改变会对熔化过程产生抑制作用。Choi等人[22-23]研究了气泡驱动对储放热过程的影响,发现强化作用使储放热时间分别减少了40%和12%。
综上所述,目前关于相变储热器主动强化的研究考虑了光滑和翅片内管旋转、内管平移等多种方式,而未考虑偏心放置的光滑内管绕中心轴线旋转的方式。为进一步探究偏心内管的旋转运动对卧式管壳式相变储热器储热性能的强化效果,本文采用数值模拟方法,建立了相变储热器的二维数值计算模型,研究了内管偏心放置绕中心轴线旋转对储热过程的影响,以期获得内管移动优化方案。
本文采用卧式相变储热器结构如图1所示。换热流体在管侧流动,PCM放置于壳侧,储热器材料为铜,PCM为石蜡材料RT35[24],物性参数见表1。内管半径r1=19 mm,管壁厚度d=1 mm,外管半径r2=50 mm,忽略外管厚度,储热器长度L=500 mm。内管偏心放置时,内管偏心距离e为内管底部与外管圆心的距离。
本文利用动网格技术实现网格运动,采用网格光顺和重构方法实现网格的更新并通过用户自定函数(UDF)确定内管旋转方向和旋转速度,实现内管绕中心轴线的公转运动。设置5个内管旋转速度,分别为0.05、0.10、0.20、0.30、0.40 r/min;4个内管偏心距离,分别为3、5、7、9 mm。
为保证旋转顺利进行,初始时刻保持内管静止10 s,使贴近内管的PCM熔化为液态后开始旋转。利用最大转速0.4 r/min在偏心距离为9 mm旋转过程中,内管与液相分数为0.001界面之间的位置判断内管与固态PCM是否接触。储热时间10、50、100、150 s时内管与液相分数为0.001界面位置如图2所示。由图2可知,内管外壁面与液相分数为0.001界面始终保持一定距离。这意味着内管在绕储热器外壳中心轴线的旋转过程中,壁面附近的固态PCM始终为液态,能够正常进行旋转运动。
采用Fluent数值计算软件中的凝固-熔化模型求解相变过程。凝固-熔化模型基于焓-孔隙率方法,PCM区域被视为多孔介质,使用孔隙率表示单元网格的液相分数。为简化计算过程,采用相关假设[25-26]如下:
1)PCM的流动为二维、瞬态、层流和牛顿不可压缩流体;
2)PCM的热物性参数稳定且不随温度变化;对于动量方程浮升力项中的密度变化,采用Boussinesq假设;
3)忽略PCM在相变过程中的体积变化;
4)忽略PCM在相变过程中的黏性耗散。
通过假设,控制方程如下[27-28]
1)连续性方程
ux+vy=0
2)动量方程
(ρu)t+(ρuu)x+(ρuv)y=Px+x(μux)+y(μuy)+Au
(ρv)t+(ρuv)x+(ρvv)y=Py+x(μvx)+y(μvy)+Av+ρgα(TTref)
式中:ρ为PCM的密度,kg/m3µ为动量黏度,kg/(m·s);g为标准重力加速度,m/s2α为热膨胀系数,K–1Tref为参考温度,K;T为单元网格内PCM的平均温度,K;AuAv为动量源项,作用是控制PCM的速度;A为孔隙率函数,表示对PCM速度阻尼作用,如方程(4)所示。
A=C(1β)2β3+ε
式中:C为糊状区域常数,该值会对PCM的相变过程产生影响,取值范围是104~107[29-31],本文取值为105β表示局部液相分数,如方程(5)所示;常数ε为极小数0.001,避免当液相分数β为0时,分母为0。
β={0                 TTsTTsTlTsTs<T<Tl1                 TTl
式中:TsTl为PCM的固相和液相温度,K。
3)能量方程
(ρh)t+(ρuh)x+(ρvh)y=x(kTx)+y(kTy)+Sn
式中:k为PCM的导热系数,W/(m·K);h为PCM的焓,J,如方程(7)所示;Sn为能量源项,如方程(8)所示。
h={TrefTcpdTTTsTrefTscpdT+βΔHTsTTlTrefTscpdT+βΔH+TlTcpdTTTl
式中:cp为定压比热容,J/(kg·K);ΔH为PCM的相变潜热,J/kg。
Sn=ρΔHβt
储热器初始温度T0=298.15 K,此时PCM均为固态。内管内壁面为定温边界条件,温度Twall=338.15 K,内管外壁面为耦合边界条件,外管为绝热边界条件,数学描述如下。
1)初始温度条件
t=0, T(x,y)=T0=298.15 K
2)定温边界条件
T(x,y)=Twall=338.15 K
3)耦合边界条件
u=v=0,    Ts=TPCM
ks(xTsx+yTsy)=kPCM(xTPCMx+yTPCMy)
4)绝热边界条件
T(x,y)n=0
采用中心内管静止布置工况进行网格数和时间步长独立性验证,数值计算结果如图3所示。所选择的网格数分别为6 997、17 383、69 452和107 110,当网格数由69 452增加至107 110时,储热时间的相对误差为1.44%。选择时间步长为0.005、0.010、0.050、0.100 s,当时间步长由0.010 s降至0.005 s时,储热时间的相对误差为0.03%。因此,考虑计算时间和准确性,所选择的网格数和时间步长分别为69 452 s和0.010 s。
为了验证本文计算方法的正确性,采用相同的计算方法,将模拟结果与A.A.Al-Abidi等人[32]实验和数值计算结果进行对比,PCM的平均温度变化如图4所示。数值计算与实验结果之间的最大相对误差小于3%,验证了本文计算方法的准确性。
通过建立相变储热器二维数值计算模型,研究相变储热器内管偏心放置并绕中心轴线旋转对储热过程的强化作用,分析不同内管偏心距离和旋转速度下相变储热器的储热性能,获得优化内管旋转运动方案。
当中心内管静止布置时,储热时间为12 783.3 s。表2为不同偏心距离和旋转速度的储热时间。由表2可见,当内管旋转速度和偏心距离分别为0.10 r/min和9 mm时,最短储热时间为1 002.2 s,与传统的中心内管静止布置相比,储热时间减少了92.16%,强化效果显著。
储热量Q和时间平均储热速率q¯计算公式为:
Q=cpmT2T0+βΔH
q¯=Qt
式中:m为储热器PCM质量,kg;T2为储热过程完成时PCM的平均温度,K;t为储热时间,s。
图5为不同工况储热量Q和时间平均储热速率q¯。由图5a)可知,传统中心内管静止布置储热量Q=647.8 kJ,部分旋转速度和偏心距离条件下,偏心旋转运动具有更大的储热量。这是由于随着旋转速度的增大,内管与PCM之间的换热时间减少,使PCM的平均温度降低,储热量减少。内管偏心距离和旋转速度分别为5 mm和0.40 r/min时,储热量具有最大值671.76 kJ,与传统的中心内管静止布置相比,增大了3.7%。由图5b)可知,传统中心内管静止布置时间平均储热速率q¯=50.68 W,旋转运动提高了储热过程的时间平均储热速率,当内管偏心距离和旋转速度为9 mm和0.10 r/min时,时间平均储热速率具有最大值583.1 W,是中心内管静止状态下的11.51倍。
表2可知,当内管偏心距离为3、5、7 mm时,储热时间随旋转速度的增加而减小,当偏心距离为9 mm时,储热时间随旋转速度总体上呈现先增大后减小的趋势。对偏心距离为9 mm时,不同旋转速度对储热过程的影响进行分析。
图6为内管偏心距离9 mm时不同旋转速度液相分数和储热量Q。由图6a)可知,随旋转速度提高,液相分数曲线斜率增大,不同曲线间的间距减小。液相分数曲线斜率随储热过程进行呈现减小的趋势,斜率首次降低的时间随旋转速度的增加而减小,分别是919.0、512.9、287.4、212.7、182.1 s。各旋转速度对应的曲线斜率均产生波动,波动次数随旋转速度的提高而显著增加。这主要是由于随着转速的提高,内管热壁面与固态PCM之间位置的变化频繁,较小的传热热阻使得曲线斜率显著增大。在偏心距离固定为9 mm时,与旋转速度0.30 r/min相比,旋转速度0.10 r/min时的储热时间减少13.57%。
图6b)可知,在旋转速度为0.10 r/min的储热过程完成时,不同旋转速度之间的潜热储热量差距较小。在偏心距离固定为9 mm时,与旋转速度为0.30 r/min相比,0.10 r/min的显热和潜热储热量分别提高了31.01%和0.57%,强化效果显著。
图7为偏心距离9 mm,旋转速度分别为0.10、0.30 r/min在储热时间为200和400 s时的液相分布云图。
图7可见,在相同时间内,较大的旋转速度使内管掠过更大的面积,内管在确定位置处的停留时间减小,导致内管掠过的部分处于固-液共存状态,此时固-液共存区域的液相分数为0~1,暂未完全熔化。由于此时内管偏心距离为9 mm,紧邻外壳附近的固态PCM熔化效果较好,并无显著的固-液共存区域。在内管移动过程,熔化死区位置始终位于壁面移动方向的前端,与内管壁面的距离不断减小,直至PCM完全熔化。
图8为偏心距离等于9 mm时,旋转速度分别为0.10、0.30 r/min在储热时间为200 s和400 s时的温度云图。由图8可见,较快的旋转速度使内管在旋转过程经过位置的平均温度较低,储热器上部由于受到自然对流的影响,平均温度显著大于底部位置且水平方向的温度梯度较大,不利于储热器水平方向的热量传递,导致水平方向热量分布不均匀。
表2可知,旋转速度确定时,储热时间随着偏心距离的增大而减小。本节对旋转速度为0.10 r/min时,内管偏心距离对储热过程的影响进行分析。旋转速度为0.10 r/min时,不同偏心距离的液相分数和储热量Q图9所示。由图9a)可知,随着偏心距离的增大,液相分数曲线斜率增加。由于内管移动过程中与PCM之间的传热热阻改变,使得液相分数曲线斜率在储热过程中产生波动。在旋转速度固定为0.10 r/min时,储热时间在偏心距离9 mm时为最小值,与偏心距离为3 mm相比,储热时间减少了70.48%。在旋转速度和内管偏心距离分别为0.10 r/min和9 mm工况下具有最短储热时间。此时,偏心距离为9 mm的显热和潜热储热量分别为127.6、456.8 kJ,与偏心距离为3 mm相比,显热和潜热储热量分别提高24.12%和11.39%。
内管旋转速度0.10 r/min时不同偏心距离的壁面热流曲线如图10所示。随着内管偏心距离的增大,壁面热流提高。储热过程开始时,内管与紧邻壁面的固态PCM之间具有最大换热温差,此时换热效果最好;随着PCM由固态逐渐熔化为液态,内管与PCM之间的换热热阻逐渐增大,壁面热流显著降低。旋转运动开始后,内管与固态PCM间的距离随旋转运动而减小,导致换热热阻减小,壁面热流进一步提高;随着储热过程进行,PCM液相分数和平均温度逐渐提高,内壁面温度不变时,内管移动过程中与PCM间的换热温差减小,使得壁面热流的波动幅值逐渐降低。
图11为储热时间400 s时旋转速度和偏心距离为0.10 r/min和9 mm的速度矢量。由图11可知,储热过程开始后,内管壁面附近PCM具有较大的流动速度,使得此处的换热效果较好。内管移动方向前端,PCM的流动方向与内管移动的方向相反,使前端位置处的液相PCM向后方流动;后端位置处,PCM的流动方向与内管移动方向相同。在内管已掠过的区域,液相PCM位置处产生了显著的涡流现象,可能的原因是此位置处PCM的温差较大,涡流会影响换热效果,降低涡流区域的传热速率。
本文提出了一种适用于卧式管壳式相变储热器的新型内管偏心放置绕中心轴线旋转的运动方式,通过数值模拟方法分别研究了内管旋转速度和偏心距离对储热过程的影响,主要结论如下。
1)与传统中心内管静止布置相比,采用偏心内管旋转方式能够显著提高卧式管壳式相变储热器的储热性能,当内管旋转速度为0.10 r/min,偏心距离为9 mm时具有最短储热时间1 002.2 s,储热时间减少了92.16%;时间平均储热速率具有最大值583.1 W,是中心内管静止状态下的11.51倍。
2)内管偏心距离固定时,卧式管壳式相变 储热器的储热时间随旋转速度的变化情况复杂。当偏心距离为9 mm,旋转速度由0.30 r/min减至0.10 r/min时,储热时间减少了13.57%,显热和潜热储热量分别提高了31.01%和0.57%。
3)内管旋转速度固定时,卧式管壳式相变储热器的储热时间随内管偏心距离的增大而减小,当旋转速度为0.10 r/min,偏心距离由3 mm增至9 mm时,储热时间减少了70.48%,显热和潜热储热量分别提高了24.12%和11.39%。
  • 中国华能集团有限公司总部科技项目(HNKJ24-HF36)
  • 山东省自然科学基金项目(ZR2023ME025)
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2024年第53卷第9期
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doi: 10.19666/j.rlfd.202403057
  • 接收时间:2024-03-22
  • 首发时间:2026-03-06
  • 出版时间:2024-09-25
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  • 收稿日期:2024-03-22
基金
Science and Technology Project of China Huaneng Group Co., Ltd.(HNKJ24-HF36)
中国华能集团有限公司总部科技项目(HNKJ24-HF36)
Natural Science Foundation Project of Shandong Province(ZR2023ME025)
山东省自然科学基金项目(ZR2023ME025)
作者信息
    1.山东大学能源与动力工程学院高效储能及氢能利用山东省工程研究中心,山东 济南 250061
    2.华能山东发电有限公司,山东 济南 250014
    3.华能国际发电有限公司日照电厂,山东 日照 276800

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高明(1977),男,博士,教授,主要研究方向为高效储能及氢能利用技术,
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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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