Method and device for recycling methane in membrane hydrogen extraction tail gas

Abstract

The invention discloses a method and a device for recycling methane in membrane hydrogen extraction tail gas. The method includes purification operation, compression operation, liquefaction operation and storage operation. The device comprises a purification unit, a compression unit, a liquefaction unit, a storage unit and a diffusion unit. The purification unit is used for operating virgin gas, and purified gas is delivered to the liquefaction unit; the compression unit is used for carrying out pressurization and cooling operation on nitrogen, and expanded and refrigerated low-temperature gas is delivered to the liquefaction unit; the liquefaction unit is used for receiving the virgin gas from the purification unit and the low-temperature gas from the compression unit; the virgin gas is cooled by the low-temperature gas under the control and then is subjected to separation operation, and separated LNG (liquefied natural gas) is delivered to the storage unit. The method and the device have the advantages that a large quantity of methane in the membrane hydrogen extraction tail gas can be recycled by the aid of the method and the device, so that energy conservation measures of enterprises can be effectively upgraded, resource consumption of the enterprises can be reduced, and an effect of comprehensively utilizing energy of the enterprises can be improved.

Description

technical field [0001] The invention relates to the field of methane recovery technology, in particular to a method and a device for recovering methane from tail gas of membrane hydrogen extraction. Background technique [0002] At present, with the continuous improvement of people's material living standards, the use of energy is also different from previous years. Therefore, many regions are now vigorously advocating energy conservation and consumption reduction, reducing energy loss, and increasing energy utilization efficiency. It can better benefit the future generations of mankind, and it also actively responds to the country's guiding ideology on sustainable development. Atmospheric methane concentrations have more than doubled over the years, mainly due to human activity, surveys show. Methane is 23 times more capable of preventing heat from escaping from the atmosphere than carbon dioxide. Therefore, reducing methane emissions and recovering methane in time is a go...

AI Technical Summary

Problems solved by technology

In the prior art, there is no good recovery treatment for the membrane hydrogen extraction tail gas, especially for the methane recovery operation in the membrane hydrogen extraction tail gas.

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