Device and method for recycling and extracting high-purity SF6 gas by employing membrane separation method

A membrane separation method and recovery device technology, which is applied in the direction of sulfur and halogen compounds, can solve the problems of complex devices and methods, and achieve the effects of simple operation, strong controllability, and reduced irreversible impact

Inactive Publication Date: 2015-08-19
SMC ASIA GAS SYST CO LTD CHENGDU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art from SF 6 Purify SF in mixed gas with gas concentration less than 15.7% 6 Apparatus and method for gas, and existing SF 6 The device and method of gas purification are re

Method used

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  • Device and method for recycling and extracting high-purity SF6 gas by employing membrane separation method
  • Device and method for recycling and extracting high-purity SF6 gas by employing membrane separation method
  • Device and method for recycling and extracting high-purity SF6 gas by employing membrane separation method

Examples

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Example Embodiment

[0040] Example 1

[0041] A method for recovering and extracting high-purity SF by membrane separation 6 The gas device includes a compressor 1 and a membrane separation and recovery device connected behind the compressor 1; the membrane separation and recovery device is composed of N hollow fiber membranes 2 connected in sequence, and the N≥4.

[0042] In this embodiment, the number N of the hollow fiber membranes 2 is preferably set to four levels, which are named first-level hollow fiber membranes, second-level hollow fiber membranes, third-level hollow fiber membranes, and fourth-level hollow fiber membranes in sequence along the gas flow direction. ,Such as figure 1 Shown. At the same time, in the present invention, the first-level hollow fiber membrane, the second-level hollow fiber membrane, the third-level hollow fiber membrane, and the fourth-level hollow fiber membrane can be selected according to different amounts of recovered gas.

[0043] In this embodiment, the above d...

Example Embodiment

[0048] Example 2

[0049] The difference between this embodiment and embodiment 1 is that: in the device of the present invention, each hollow fiber membrane 2 has a permeate side exhaust port; in the membrane separation and recovery device, the hollow fiber The permeate side exhaust port of the membrane 2 is connected to the atmosphere, and the permeate side exhaust ports of the remaining hollow fiber membranes 2 are connected to the intake port of the compressor 1, such as figure 2 Shown.

[0050] In this embodiment, the device of this embodiment is used to 6 The method of gas purification is as follows:

[0051] (1) SF 6 After the recovered gas with a content of 2.2% is pressurized by the compressor, a mixed gas with a pressure of 0.7 MPaG is obtained, and the mixed gas is passed into the first-stage hollow fiber membrane; part of the gas separated by the first-stage hollow fiber membrane is SF 6 The content is less than 0.1%, so it meets the gas emission standards and can be dir...

Example Embodiment

[0059] Example 3

[0060] The difference between this embodiment and Embodiment 2 is that a gas pretreatment purification system is added in this embodiment, and the specific setting method is as follows:

[0061] A gas pretreatment purification system 3 is also provided between the compressor 1 and the membrane separation recovery device. The gas pretreatment and purification system 3 includes a compressed gas buffer tank, a precision filter, an ultra-precision filter, an activated carbon filter, and a dust filter that are sequentially connected along the gas flow direction, such as image 3 Shown.

[0062] Further, in order to facilitate control, the back end of the membrane separation recovery device is also connected with SF 6 For the finished gas buffer tank, the back end of the membrane separation and recovery device is also provided with a flow meter and a valve for adjusting the gas flow.

[0063] In this embodiment, the device of this embodiment is used to 6 The method of ga...

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Abstract

The invention discloses a device and a method for recycling and extracting a high-purity SF6 gas by employing a membrane separation method, and mainly aims at solving the problems of absence of a device and a method for purifying an SF6 gas from a mixed gas of which the SF6 gas concentration is smaller than 15.7% in the prior art, and relatively complicated existing device and method for purifying the SF6 gas. The device disclosed by the invention comprises a compressor (1) and a membrane separating and recycling device, wherein the membrane separating and recycling device is connected to the back of the compressor (1); the device is characterized in that the membrane separating and recycling device is composed of N hollow fiber membranes (2) which are sequentially connected with one another; and N is greater than or equal to 4. The invention further discloses a method for recycling and extracting the SF6 gas by employing the device. The device and the method have the advantages of being suitable for purification of a low-concentration SF6 gas and extremely high in purification degree and recovery rate.

Description

technical field [0001] The present invention relates to SF 6 A gas recovery device and method, specifically relating to a method of recovering and extracting high-purity SF by membrane separation 6 Apparatus and method for gases. Applies to all involved SF 6 Gases and air (oxygen, nitrogen, argon), helium, CO 2 , water vapor and other mixed gases in SF 6 Gas recovery. Background technique [0002] SF 6 The gas has excellent arc extinguishing and insulating properties, and is widely used in high-voltage electrical equipment such as high-voltage electrical switchgear, transformers, and inflatable cables. It is also used to fill the insulating gas of high-end double-layer doors and windows. SF 6 Gas will be irreplaceable in these fields. But since SF 6 Gas is a highly stable greenhouse gas, and its greenhouse effect damages the atmospheric environment as much as CO 2 23000 times that of gas. Therefore, from the perspective of atmospheric environmental protection, SF ...

Claims

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Application Information

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IPC IPC(8): C01B17/45
Inventor 沈强孟翰武马鹏胡波
Owner SMC ASIA GAS SYST CO LTD CHENGDU
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