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Separation and Recovery of Insulation Gas Mixtures by Using a Membrane

使用膜分离和回收绝缘气体混合物

基本信息

批准号：
13650305
负责人：
YAMAMOTO Osamu
金额：
$ 2.24万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650305/
关键词：
Gas Mixtures Gas Insulation Membrane SP6 N2 Gas separation Recovery loss Gas Purification 混合ガス絶縁回収純度

项目摘要

The worldwide effort of reducing SF_6 gas, which is of extremely high global warming potential (GWP), concerns not only the electric power industry but also other sectors such as the magnesium industry, the electronics industry and so on. One of the practical solutions of reducing or minimizing the amount of SF_6 in electric power apparatus is to utilize a pressurized gas mixture, in which a low content of an electronegative gas is mixed with an ordinary gas such as N_2, CO_2 or air. However, in the case of a gas mixture including a low concentration of SF_6, the conventional liquefaction method is difficult to apply, since the recovery loss or the release rate of SF_6 into the atmosphere during the liquefaction process is very high.We have developed a method to recover SF_6 from gas mixtures composed of SF_6 and N_2 by using. a polymer membrane. The concentration of SF_6 in a recovered gas, the recovery loss and the gas handling speed are investigated experimentally.First, we have investigated gas recovery from gas mixtures containing SF_6 of 5 - 20 vol. % using a single membrane separator, and clarified that the purity of recovered gas and the recovery loss depend on various parameters such as mixing ratio of an original gas, the temperature of the membrane and the feeding pressure. When the mixing ratio is 10 vol. %, for example, the purity of SF_6 in the recovered gas is higher than 90 vol. %, but the recovery loss is inadmissibly high as 20 - 50 %.Second, we have investigated a recovery method using two separators connected in cascade to keep the purity of recovered gas as high as possible and minimize the recovery loss. With this method, the purity increases up to 98 vol. % or even higher, and the recovery loss decreases as low as 1 % at a gas handling speed of about 13 NI (normal litter) min^<-1>. Finally, we have developed a system which allows automatic control of the released gas concentration and keeps the recovery loss at a required late.

全球范围内减少具有极高全球变暖潜能值（GWP）的SF_6气体的努力不仅涉及电力行业，还涉及其他行业，如镁工业、电子工业等。减少或尽量减少电力设备中SF_6含量的实际解决方案之一是利用加压气体混合物，其中将低含量的电负性气体与普通气体（如n2， CO_2或空气）混合。然而，对于含有低浓度SF_6的气体混合物，由于在液化过程中SF_6的回收损失或释放到大气中的速率非常高，传统的液化方法很难适用。我们开发了一种从由SF_6和N_2组成的气体混合物中回收SF_6的方法。聚合物膜实验考察了回收气中SF_6的浓度、回收损失和气体处理速度。首先，研究了用单膜分离器从含SF_6的5 ~ 20vol . %气体混合物中回收气体的情况，明确了回收气体的纯度和回收损失与原始气体的混合比、膜的温度和进料压力等参数有关。例如，当混合比为10 vol. %时，回收气体中SF_6的纯度高于90 vol. %，但回收损失高达20 ~ 50%，是不可接受的。其次，我们研究了一种采用两个分离器级联的回收方法，以尽可能提高回收气体的纯度，并尽量减少回收损失。使用该方法，在气体处理速度约为13 NI（正常废砂）min^<-1>的情况下，纯度可提高至98 vol. %甚至更高，回收率损失降低至1%。最后，我们开发了一个系统，可以自动控制释放的气体浓度，并将采收率损失保持在所需的后期。