Development of an Environmentally Benign Heat Pump Using Fluid Mixed Supercritical Carbon dioxide and Methanol

使用超临界二氧化碳和甲醇混合流体开发环保热泵

• 批准号: 12650770
• 负责人: OCHI Kenji
• 金额: $ 2.24万
• 依托单位: Nihon University
• 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 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650770/
• 关键词: Supercritical carbon dioxide; Heat of mixing; Heat pump

This research aims at developing an environmentally benign heat pump, which utilize the large heat effect at mixing carbon dioxide with methanol at near critical point of carbon dioxide. In order to perform the research a recycle system of the fluids (carbon dioxide and methanol) has been designed to examine what amount of heats generated in mixing were effectively corrected. This examination gained the following knowledge.1. For the mixing cell, which is the main part of this heat cycle system, a concentric tube mixer was cited to perform the flow mixing of two fluids in the vicinity of critical point of carbon dioxide (309K, 7.5MPa) regardless of the difference of fluids density. This mixing method provided the temperature increase of about 20 degree around composition of the mixture, 35mol% carbon dioxide. This heat effect corresponds to 80% of the heat of mixing confirmed by an isothermal micro calorimeter. However, the larger temperature increase has not been observed even around … More the composition of 80 mol% carbon dioxide, where the largest heat effect can be expected. The reason of this will be considered that the scale of apparatus was not enough to control finely the composition of mixture in the carbon dioxide rich region. And also the heats of mixing will be consumed in the sensible-heat of mixtures.2. In order to separate the mixture into carbon dioxide and methanol., and to recycle them, respectively, a separate with wire netting has been designed. This device was combined with a back pressure regulator to perform preventing any entrainment methanol droplets in the carbon dioxide gas.3. A liquification method of carbon dioxide gas from separator was examined for recycling the gas as the liquid phase. This device was made by combining a heat exchange with an adiabatic expansion of the gas. The controlling system of this liquification method has been still continued to examine.4. The measurement of heat of mixing by a calorimeter has been also carried for searching such new fluids that the larger heat effect can be expected in the vicinity of the critical point of carbon dioxide. Less

本研究旨在开发一种环境友好型热泵，利用二氧化碳与甲醇在接近二氧化碳临界点混合时产生的巨大热效应。为了进行研究，设计了流体（二氧化碳和甲醇）的循环系统，以检查混合过程中产生的热量得到了有效校正。通过这次考试，获得了以下认识： 1．对于作为该热循环系统的主要部分的混合单元，采用同心管混合器在二氧化碳临界点（309K，7.5MPa）附近进行两种流体的流动混合，而不管流体密度的差异。这种混合方法使混合物的成分（35mol%二氧化碳）温度升高约20度。该热效应相当于等温微热量计所证实的混合热的80%。然而，即使在二氧化碳含量为 80 mol% 的区域也没有观察到较大的温度升高，而此处的热效应预计最大。其原因可以认为是设备的规模不足以精细地控制富含二氧化碳的区域中的混合物的组成。混合热也以混合物的显热的形式消耗掉。 2．为了将混合物分离成二氧化碳和甲醇，并分别回收它们，设计了带有金属网的分离器。该装置与背压调节器相结合，可防止二氧化碳气体中夹带甲醇液滴。 3．研究了来自分离器的二氧化碳气体的液化方法，以将气体作为液相再循环。该装置是通过将热交换与气体绝热膨胀相结合而制成的。该液化方法的控制系统还有待继续研究。 4．为了寻找在二氧化碳临界点附近可以预期产生更大热效应的新流体，还进行了热量计的混合热测量。较少的

项目成果

Kenji Ochi, Wenbin Dai, Yutaka Wada, Hiroyuki Hayashi, Kiyofumi Kurihara, Kazuo Kojima: "Measurement and Correlation of Excess Molar Enthalpies for the Systems Containing Supercritical Carbon dioxide and Alcohols"Fluid Phase Equilibira. (in press). (2002)

Kenji Ochi、Wenbin Dai、Yutaka Wada、Hiroyuki Hayashi、Kiyofumi Kurihara、Kazuo Kojima：“含有超临界二氧化碳和醇的系统的过量摩尔焓的测量和关联”流体相平衡。

Kenji OCHI: "Heats of Mixing in the Supercritical Region and Their Applications"Journal of the Society of Inorganic Materials, Japan. Vol. 8. 166-173 (2001)

Kenji OCHI：“超临界区的混合热及其应用”日本无机材料学会杂志。

越智健二: "超臨界領域における混合熱とその利用"Journal of the Society of Inorganic Materials, Japan. 8. 166-173 (2001)

Kenji Ochi：“超临界区的混合热及其利用”，日本无机材料学会杂志，8. 166-173 (2001)。

Kenji Ochi Wenbin Dai, Yutaka Wada, Hiroyuki Hayashi, Kiyofumi Kurihara, Kazuo Kojima: "Measurement and correlation of excess molar enthalpies for the systems containing supercritical carbon dioxide and alcohols"Fluid Phase Equilibira. (in press). (2002)

Kenji Ochi Wenbin Dai、Yutaka Wada、Hiroyuki Hayashi、Kiyofumi Kurihara、Kazuo Kojima：“含有超临界二氧化碳和醇的系统的过量摩尔焓的测量和相关性”流体相平衡。

越智健二: "超臨界領域における混合熱とその利用"Journal of the Society of Inorganic Materials, Japan. 8.3. 166-173 (2001)

Kenji Ochi：“超临界区的混合热及其利用”，日本无机材料学会杂志 8.3（2001 年）。