Purification separation and recovery system for mixed gas

Abstract

The invention relates to a purification separation and recovery system for a mixed gas. The system comprises a pretreatment unit, a gas separation unit and a pure-gas recovery unit which are connectedin series; the upstream end part of the pretreatment unit is provided with a recovery opening used for connecting with a switch air chamber; and the gas separation unit comprises a primary membrane separator connected with the downstream end part of the pretreatment unit, the downstream of the primary membrane separator is connected with a first secondary membrane separator and a second secondarymembrane separator in parallel, and the first secondary membrane separator is connected with a nitrogen outlet of the primary membrane separator, the second secondary membrane separator is connectedwith a sulphur hexafluoride outlet of the primary membrane separator, the nitrogen outlet of the first secondary membrane separator is vented, the sulphur hexafluoride outlet is connected with the pretreatment unit through a reflux pipeline, the nitrogen outlet of the second secondary membrane separator is connected with the pretreatment unit through a reflux pipeline, and the sulfur hexafluorideoutlet is connected with the downstream pure-gas recovery unit. According to the system provided by the invention, the two secondary membrane separators are separately used for especially separating anitrogen gas and sulfur hexafluoride, and therefore the separation effect is improved.

Description

technical field [0001] The invention belongs to the technical field of mixed gas recovery, and in particular relates to a mixed gas purification, separation and recovery system. Background technique [0002] Sulfur hexafluoride (SF 6 ) gas is widely used in the power industry because of its excellent insulation and arc extinguishing properties. However, the greenhouse effect of sulfur hexafluoride is significant, and the price of sulfur hexafluoride gas is relatively expensive, which limits the application of sulfur hexafluoride. In order to meet the requirements of environmental protection and reduce greenhouse gas emissions, the mixed gas of sulfur hexafluoride and nitrogen is usually used to replace pure sulfur hexafluoride gas. However, the electrical equipment using the mixed gas of sulfur hexafluoride and nitrogen inevitably needs to be repaired and maintained during the operation process. During the repair and maintenance process, the mixed gas of sulfur hexafluorid...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a mixed gas purification, separation and recovery system to solve the technical problem of poor separation effect of the existing mixed gas purification, separation and recovery system

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