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A Study on Chemical Heat Pipe with Energy Upgrading Function at High-Temperature level

高温能量升级化学热管研究

基本信息

批准号：
06452428
负责人：
MATSUDA Hitoki
金额：
$ 1.98万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452428/
关键词：
Chemical Heat Pipe Thermal Energy Transportation Heat Exchange Catalytic Reaction Tube-Wall Reactor Catalytic Packed-Bed Equilibrium of Reaction Chemical Heat Pump

项目摘要

The heat excahge characteristics accompanied by an exothermic reaction at heat demand end of a chemical heat pipe system using SO_2/O_2/SO_3 reversible thermochemical reaction was discussed in a lab-scale unit. The effects of the reactant gas composition, the mass flow rate of reactant gas and heat exchange medium on the reaction and the heat exchange characteristics were discussed. Furthermore, a cpmparison between the experimental and calculated results obtained by using a two-dimensional mathematical model, in which the reaction and heat transfer was considered simultaneously, was performed. It was found that the heat exchange characteristics obtained from experiments can be explained tendentiously by the calcutated results. Under the adiabatic conditions, the temperature difference between the outlet and the inlet of the heat exchange medium increased with an increase of the mass flow rate of SO_2 and a decrease of the mass flow rate of the heat exchange medium, while the efficiency on the heat exchange process decreased with an increase of the mass flow rate of SO_2 and a decrease of the mass flow rate of the heat exchange medium.In order to examine the temperature upgrading effect of the proposed chemical heat pipe, a calculation was made to estimate the effect of reaction pressure on the temperature upgrading. It is shown that the temperature difference, that is, the effect of temperature upgrading increased with an increase in both the molar ratio of SO_2 and the pressure in the reactor of heat demand end. On the other hand, it is shown that the value of COP increased with an increase in the molar ratio of SO_2 but decreased slightly with an increase of pressure in reactor of heat demand end. Consequently, it was clear that SO_2/O_2/SO_3 system can be to apply as a chemical heat pipe with chemical heat-pump function.

本文在实验室装置上讨论了利用SO_2/O_2/SO_3可逆热化学反应的化学热管系统在需热端伴有放热反应的放热特性。讨论了反应气体组成、反应气体质量流量和换热介质对反应和换热特性的影响。此外，还采用同时考虑反应和传热的二维数学模型对实验结果和计算结果进行了比较。结果表明，计算结果能较好地解释实验所得的换热特性。在绝热条件下，随着SO2质量流量的增大和换热介质质量流量的减小，换热介质进出口温差增大，而热交换过程的效率随着SO_2质量流量的增加而降低为了考察所提出的化学热管的升温效果，计算了反应压力对升温的影响。结果表明，随着SO_2摩尔比的增大和需热端反应器压力的增大，反应器内的温差即升温效果增大。另一方面，COP值随SO_2摩尔比的增加而增加，随需热端反应器压力的增加而略有下降。因此，SO_2/O_2/SO_3系统可以作为具有化学热泵功能的化学热管应用。