毛细泵技术用于工业余热回收系统中的实验研究

发布时间：2018-04-10 11:14

本文选题：余热回收 + 毛细泵　；参考：《中南大学》2011年硕士论文

【摘要】：毛细泵系统目前广泛应用于航天器的热控制和电子器件的散热,其工作原理与热管相似,是一种利用工质相变换热进行远距离传热的装置,但与热管相比,毛细泵系统具有更强的传热能力和抗重力性能。考虑到毛细泵系统的诸多优点,本文以其在中低温工业余热回收中的应用为目的,设计了一套以水为工质的平板式毛细泵系统,并对其性能进行了实验研究。为减小毛细泵系统与热源之间的热阻,蒸发器设计成平板型,分为可拆装的上板和下板。为研究侧壁导热对平板型蒸发器运行情况的影响,采用VOF多相流模型对蒸发器进行了数值模拟,发现减小下板侧壁厚度或者使用较小导热系数的材料作为蒸发器下板能够减少蒸发器侧壁的导热量,避免毛细芯下部液体工质气化导致的系统失效。本文选择了黄铜作为蒸发器上板材料,聚四氟乙烯作为下板材料,滤纸作为毛细芯材料。对本文毛细泵系统进行的性能研究包括：启动性能、运行稳定性、热源方向的影响、抗重力高度、传热效率以及两蒸发器并联的运行情况。结果表明：系统具有良好的启动性能和运行稳定性,未出现温度波动现象；不同热源方向对系统运行情况无明显影响；系统抗重力高度达到0.6m,能满足对抗重力高度要求较低场合的应用；系统的实际传热效率约为70%,蒸发器与冷凝器之间的温差对传热效率有较大影响；两蒸发器并联的系统能够成功运行,表明毛细泵系统具有能将分散热源集中的性能。毛细泵系统是传热装置,为对系统传导出的热能进行利用,本文将温差发电器与毛细泵系统相结合,设计了一套能够将工业余热回收并转换为电能的装置,并通过实验研究了该装置的热电转换效率。最后,针对铝电解槽侧壁余热的回收利用,设计了一整套热能导出、发电以及电能控制系统,理论分析了其余热利用效率可达3.5%,电解一吨铝能产生电能19.8kWh,具有一定的经济效益。
[Abstract]:Thermal control of capillary pump system is widely used in spacecraft and the heat dissipation of electronic devices, the working principle of the heat pipe and is similar to that of a device using refrigerant phase-change heat transfer heat transfer distance, but compared with the heat pipe, the heat transfer capacity of capillary pump system has stronger anti gravity performance and considering the advantages. The capillary pump system, for the purpose of its application in low-temperature industrial waste heat, a plate type capillary pump system based on water propellant is designed, and its performance was studied.
To decrease the thermal resistance between the capillary and heat pump system, the evaporator design is flat, divided into upper plate and the lower plate can be disassembled. In order to study the effect of side wall heat conduction to the evaporator, the VOF multiphase flow model of evaporator is simulated, found under reduced plate side wall thickness or smaller the thermal conductivity of materials as the evaporator plate can reduce the thermal capacity of evaporator side wall, avoid failure system of liquid vaporization under the wick. The lead brass material as the evaporator plate, Teflon as the plate material, the filter paper as the wick material.
Study on the performance of the CPL include: running stability, starting performance, the influence of heat source direction, anti gravity height, the heat transfer efficiency and the operation of two parallel evaporators. The results show that the system has good startup performance and operational stability, without the temperature fluctuation; different source direction has no obvious effect on the operation of the system system; anti gravity height is 0.6m, can meet the application requirements of low gravity height situations; the actual heat transfer efficiency of the system is about 70%, the temperature difference between the evaporator and the condenser has a great influence on the heat transfer efficiency of the system; two parallel evaporators can run successfully, that CPL can be centralized heat dispersion performance.
CPL is a heat transfer device for heat on the system transmission of the use, the thermoelectric generator and the capillary pump system combined to design a set of industrial waste heat recovery and converted into electrical energy device, and through the experimental study on the thermoelectric conversion efficiency of the device. Finally, the recovery of aluminum electrolytic tank side wall of waste heat utilization, design a set of heat transfer, power generation and power control system, the theoretical analysis of the remaining heat utilization efficiency can reach 3.5% tons of aluminum electrolysis to produce electricity 19.8kWh, has a certain economic benefits.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38;TK115

【参考文献】