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Method and device for jointly separating hydrogen through pressure swing adsorption and unpowered membrane separation

A technology of pressure swing adsorption and dynamic membrane, which is applied in the direction of hydrogen separation and hydrogen separation using solid contact, which can solve the problems of low hydrogen purity, large cost investment, and low hydrogen yield, so as to increase yield and reduce cost input and energy consumption, the effect of avoiding the use

Inactive Publication Date: 2013-05-22
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to overcome the deficiencies of low hydrogen yield, low hydrogen purity, large cost investment and high energy consumption in the existing process, and provide a method for combined separation of hydrogen by pressure swing adsorption without dynamic membrane separation

Method used

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  • Method and device for jointly separating hydrogen through pressure swing adsorption and unpowered membrane separation

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Embodiment 1

[0042] A method for pressure swing adsorption unpowered membrane separation combined separation of hydrogen, comprising the following steps:

[0043] A. One-stage pressure swing adsorption: pressurize the raw material gas and send it to the first-stage pressure swing adsorption tower to absorb some impurities to obtain intermediate gas;

[0044] B. Two-stage pressure swing adsorption: pressurize the intermediate gas and send it to the two-stage pressure swing adsorption tower to absorb impurities and obtain product hydrogen;

[0045] C. Regeneration: Reverse release after equalizing the pressure drop of the first-stage PSA tower, reverse discharge after equalizing the pressure drop of the second-stage PSA tower, and the first flushing of the first-stage PSA tower by the reverse discharge gas of the second-stage PSA tower. The pressure of the first-stage pressure swing adsorption tower is increased, and then the product hydrogen is used to perform high-pressure flushing on t...

Embodiment 2

[0050] In this embodiment, in order to eliminate the influence of the pressure fluctuation of the high-pressure flushing gas on the membrane separation device, on the basis of Embodiment 1, in step C, the high-pressure flushing gas is stabilized and then introduced into the membrane separation device.

Embodiment 3

[0052] In this example, in order to improve the yield, on the basis of Example 1, the permeate gas is used as the raw material gas.

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Abstract

The invention discloses a method for jointly separating hydrogen through pressure swing adsorption and unpowered membrane separation. The method comprises a one-stage pressure swing adsorption, a two-stage pressure swing adsorption and a regeneration step, wherein the regeneration step specifically comprises the following steps that: reverse release is carried out after uniform pressure drop of a one-stage pressure swing adsorption tower, the reverse release is carried out after the uniform pressure drop of a two-stage pressure swing adsorption tower, the one-stage pressure swing adsorption tower is subjected to the first washing by the reverse gas release of the two-stage pressure swing adsorption tower, uniform pressure rise of the two-stage pressure swing adsorption tower is carried out, then the two-stage pressure swing adsorption tower is subjected to high-pressure washing by using hydrogen, and at the same time, the high-pressure washing gas is introduced in a membrane separation device, permeate gas with high hydrogen content is recycled, un-permeate gas is used for carrying out the second washing on the one-stage pressure swing adsorption tower, and the one-stage pressure swing adsorption tower is subjected to the uniform pressure rise after the washing is accomplished. The invention further discloses a device for jointly separating hydrogen through pressure swing adsorption and unpowered membrane separation. The method and device have the advantages of high yield, high hydrogen purity, low cost investment and low energy consumption.

Description

technical field [0001] The invention relates to the field of hydrogen recovery, in particular to a method and device for combined separation of hydrogen by pressure swing adsorption and non-dynamic membrane separation. Background technique [0002] Pressure swing adsorption (PSA) is widely used in the field of hydrogen recovery. In the existing pressure swing adsorption hydrogen production process and equipment, in order to increase the yield and reduce the operating cost, multiple pressure equalizations are used, but the hydrogen yield generally does not exceed 92%. For a long time, due to the characteristics of pressure swing adsorption technology, the yield of product hydrogen is inversely proportional to the purity of product hydrogen, resulting in a low yield of product hydrogen under the requirement of obtaining high-purity product hydrogen. Therefore, based on the existing pressure swing adsorption technology The production of high-purity hydrogen on the Internet has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01B3/56
Inventor 钟雨明钟娅玲詹家聪陈运
Owner SICHUAN TECHAIRS
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