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STUDY ON THE ENHANCEMENT MECHANISM OF GAS ABSORPTION AND CONDENSATION HEAT TRANSFER BY THE COUNTERCURRENT WAVY FLOW

逆流波流增强气体吸收和冷凝传热机理的研究

基本信息

批准号：
12650219
负责人：
TERANISHI Tsunenobu
金额：
$ 2.05万
依托单位：
TOYAMA NATIONAL COLLEGE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650219/
关键词：
GAS ABSORPTION CONDENSATION HEAT TRANSFER ENHANCEMENT VERTICAL TUBE COUNTERCURRENT WAVY FLOW FLOW DIRECTION 液膜波状化汚染ガス除去

项目摘要

High efficiency of gas absorption is one of the important techniques for the protection of global environment. In our previous paper, a new concept of physical gas absorption by utilizing condensation process and mist formation was proposed and its proof experiment was conducted. In the condensate method for gas absorption, it is a remarkable feature that the mass transfer rate of soluble gas such as Carbon Dioxide are affected practically by the diffusion process in the mixed gas with faster diffusivity than in the solvent liquid. Consequently the rate of gas absorption by this method is faster compared with the conventional physical methods such as the falling liquid film method. And it was clarified that the rate of gas absorption by means of this methods depended mainly on the condensate film. On the other hand, in the forced convection condensation inside a vertical cooled tube, in which the flow direction of vapor is against gravity force, the surface of liquid condensed on the cooled wall becomes wavy, and various phenomena such as flooding, droplet entrainment and pulsation of condensate could appear in a tube. Therefore, it is expected that the enhancement of condensation heat transfer by the counter-current wavy flow in a tube might be available to get the higher performance of the absorption system.From this view point, in this study, as a basic research for the development of a high-performance and environment-friendly thermal energy recovery system, detailed investigations have been conducted to understand the possibility and the mechanism of die enhancement of gas absorption and condensation heat transfer by the countercurrent wavy flow.

高效气体吸收技术是保护全球环境的重要技术之一。在前文中，我们提出了利用冷凝过程和雾化过程进行物理气体吸收的新概念，并进行了验证实验。在凝析液法吸收气体中，二氧化碳等可溶气体的传质速率实际上受到扩散过程的影响，混合气体中的扩散系数比溶剂液体中的扩散系数快。因此，这种方法的气体吸收速度比传统的物理方法，如下降液膜法更快。并阐明了用这种方法吸收气体的速度主要取决于凝析油膜。另一方面，在垂直冷却管内的强制对流凝结中，蒸汽的流动方向与重力方向相反，冷壁上凝结的液体表面呈波浪状，管内可能出现液泛、液滴夹带和凝结液脉动等现象。从这一角度出发，本研究作为开发高性能、环保型热能回收系统的基础研究，对逆流波状流强化气体吸收和冷凝换热的可能性及其机理进行了深入的研究。