基于翅片管的固-液相变储热型换热器的模拟研究  

Simulation study of solid-liquid phase change in regenerative heat exchanger with finned tubes

作　　者：满雅萌 魏天洋 钱潇然 王维[1] MAN Yameng;WEI Tianyang;QIAN Xiaoran;WANG Wei(School of Energy Science and Technology,Harbin Institute of Technology,Harbin 150001,Heilongjiang China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《电力科技与环保》2024年第5期533-543,共11页Electric Power Technology and Environmental Protection

基　　金：国家自然科学基金项目(52106082);中国广核集团-哈尔滨工业大学先进核能与新能源研究院项目(CGN-HIT202308);黑龙江省自然科学基金项目(LH2022E064)。

摘　　要：针对现有的余热回收技术在低温余热回收方面较为落后的问题,以90℃水为输入热流体、60号石蜡为相变材料对低温蓄热换热器进行设计。采用Fluent进行仿真模拟,针对翅片管的翅片大小和数目进行储热放热仿真,并针对换热管数量进行了研究。结果表明,大翅片储热500 s时相变材料平均液态分数比小翅片和无翅片分别提升45.5%和81.3%,更能促进相变材料的储热放热效率;放热500 s时大翅片、小翅片、无翅片出口水温分别升高0.5℃、0.4℃和0.2℃,其中大翅片温度最高、最稳定;增加翅片层数的模拟结果可见,随着翅片层数增加,储热1000 s时,采用1、2、3个翅片平均液态分数分别为0.36、0.47和0.58,储热放热效果增强,相变材料熔化、冷凝平均速率增快;放热600 s时,采用1、2、3个翅片出口水温分别升高0.21℃、0.26℃和0.36℃,稳定性增强,可为余热回收中的低温余热回收提供技术指导。Existing waste heat recovery technology is relatively backward in low-temperature waste heat recovery,so a low-temperature heat-storage heat exchanger was designed with the input heat fluid of 90℃water and phase change material of 60#paraffin wax.Fluent was used to simulate the heat storage and release with different sizes and numbers.The results showed that after 500 s of heat storage,average liquid fraction of integrate finned heat exchanger was 45.5%and 81.3%more than small finned heat exchanger and no finned heat exchanger;after 500 s of heat release,outlet water temperature of integrate finned,small finned and no finned heat exchanger were 0.5℃,0.4℃,0.2℃higher than initial value,respectively.Integrate fins showed the most stable and best heat exchange ability,based on which a study on the number of tubes carried out.It was found that with 1,2,3 fin layers,after 1000 s of heat storage,average liquid fraction were 0.36,0.47,0.58;after 500 s of heat release,outlet water temperature were 0.21℃,0.26℃,0.36℃higher than initial value.Obviously,heat exchange efficiency,average melting and condensation rate of phase change material and stability were enhanced as number fin size and layer increased,can provide technical guidance for waste heat recovery in the low-temperature waste heat recovery.

关 键 词：蓄热式换热器 石蜡 固液相变 翅片管 

分 类 号：TK011[动力工程及工程热物理]