Membrane module testing method

Abstract

The invention discloses a membrane module testing method which comprises the following steps that: delivering feed gas from a feed gas tank to a membrane module by a feed gas delivery line; separating the feed gas into permeating gas and permeating residual gas in the membrane module; and analyzing the permeating gas and the permeating residual gas by a gas analyzer. The method further comprises the following steps that: setting a permeating residual gas return line to return the permeating residual gas flowing out of the membrane module to the feed gas tank; and setting a permeating gas return line to return the permeating gas flowing out of the membrane module to the feed gas tank. According to the method provided by the invention, the test for an industrial membrane module is realized with less gas consumption and lower cost; the emission of poisonous, flammable and explosive gas is reduced; and the test safety is ensured.

Description

technical field [0001] The invention relates to a gas separation membrane module, in particular to a method for testing the separation characteristics of the gas separation membrane module. Background technique [0002] Gas separation membranes have different permeability and selectivity to different types of gas molecules, so gas separation membranes can be used to selectively separate certain gases from gas mixtures, such as separating nitrogen and oxygen in air to produce pure nitrogen and oxygen-enriched air respectively , Separation of nitrogen and hydrogen in the tail gas of synthetic ammonia, separation of carbon dioxide and methane in natural gas, etc. In addition, gas separation membranes can also be used to filter and eliminate pollutants in exhaust gases from automobiles and industries, so their application fields are very wide. [0003] Gas separation membrane module is the basic unit of membrane separation system. Generally, a membrane module is a separate uni...

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Problems solved by technology

[0008] However, the above-mentioned existing testing devices and methods cannot be applied to testing industrial-grade membrane modules

The membrane area of ​​industrial grade membrane module is at least 1.0m 2 Above, some reach tens of meters 2 , the gas flow rate used to test industrial-grade membrane modules is very large, sometimes up to 10Nm 3 More than / h, if the test method of the above-mentioned laboratory test device is adopted, the following problems will occur: (1) The test gas flow rate is relatively large, and the capacity of the high-pressure steel cylinder is limited (generally, the volume of the steel cylinder is 40L, and the pressure is 10MPa, which is converted to gas under the standard state. Capacity about 4Nm 3 ), a bottle of gas can be used up in less than half an hour, even if multiple steel cylinders are connected in series with a busbar, it is difficult to meet the continuous test of more than 24 hours

Extensive use of cylinder gas as a test gas source makes the test cost high

(2) For some toxic, harmful, flammable and explosive test gases, the direct discharge of retentate gas and permeate gas into the environment is very harmful, and it is easy to cause safety accidents

(3) Due to the large membrane area of ​​industrial-grade membrane modules, the gas flow rate permeating through the membrane is also large, and it is difficult to carry the permeated gas into the gas chromatographic column for testing with purge gas

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