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Hydrogen recycling system coupling pressure swing adsorption with membrane separation and method thereof

A technology of pressure swing adsorption and membrane separation, which is applied in the fields of hydrogen separation, diffusion hydrogen separation, chemical instruments and methods, etc., can solve the problems of tail gas pressure waste, uneconomical, etc., and achieve reduced production energy consumption, low unit consumption, and improved resources The effect of utilization

Inactive Publication Date: 2017-05-10
PETROCHINA CO LTD
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Problems solved by technology

The product hydrogen purity of the membrane separation system has a more obvious effect on the hydrogen recovery rate than the pressure swing adsorption or cryogenic process. When the hydrogen recovery rate is required to be high, the required membrane area is also required under the condition of a certain raw material composition and system pressure. The larger, and the membrane area increases exponentially with the increase of the hydrogen recovery rate, but, for a specific membrane separation system and feedstock components, the hydrogen recovery rate mainly depends on the pressure ratio between the feedstock and the permeate side, and is related to both The relationship between the absolute pressure difference is small, the greater the pressure ratio, the higher the hydrogen recovery rate, but the greater the pressure ratio, the greater the compression work required to compress the raw material. Therefore, considering comprehensively, limited by the product hydrogen pressure, membrane separation The operating pressure of the process is relatively high, so the tail gas pressure is also high, resulting in waste of tail gas pressure energy. If the feed gas pressure is low, the feed gas needs to be compressed to a higher pressure. The greater the compression work, the less economical it is to adopt membrane separation technology , and for gases with higher pressure, membrane separation technology is more economical

Method used

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  • Hydrogen recycling system coupling pressure swing adsorption with membrane separation and method thereof

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Embodiment 1

[0037] A hydrogen recovery system coupled with pressure swing adsorption and membrane separation, the system includes a reformed hydrogen pipeline 1, and the outlet I of the reformed hydrogen pipeline 1 passes through a liquid separation tank I2, a mist eliminator I3, and a heater in sequence I4 is connected to the membrane separation device I5, and the outlet I of the membrane separation device I5 is connected to the hydrogen network pipeline 9 through the water cooler I6, the separator tank II7, and the compressor I8 in sequence;

[0038] The outlet II of the reforming hydrogen pipeline 1 first merges with the cracked low-separation gas pipeline 10 and then connects with the pressure swing adsorption device 11, and the outlet I of the pressure swing adsorption device 11 is connected with the hydrogen network pipeline 9, and the The outlet II of the pressure swing adsorption device 11 is connected to the membrane separation device II20 through the compressor II12, the compress...

Embodiment 2

[0042] A method utilizing the system described in embodiment 1 to reclaim hydrogen, the method is:

[0043] The reformed hydrogen flowing out of the outlet I of the reformed hydrogen pipeline 1 obtains hydrogen I and gas I through liquid removal, defogging, heating, and membrane separation, and the hydrogen gas I flows into the hydrogen network pipeline 9 through water cooling, liquid removal, and boosting. Flow part of the gas I into the gas network pipeline 25;

[0044]The reformed hydrogen flowing out of the outlet II of the reformed hydrogen pipeline 1 is combined with the cracked low fraction gas to obtain hydrogen II and tail gas I through pressure swing adsorption. Gasoline hydrogenation dry gas is combined, and after boosting, it is combined with another part of gas I to obtain mixed gas I, dry gas recovered from light hydrocarbons is combined with coal diesel dry gas, and then boosted to obtain mixed gas II. After mixed gas I and mixed gas II are combined Gas II and ...

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Abstract

The invention relates to a hydrogen recycling system coupling pressure swing adsorption with membrane separation and a method thereof. In the hydrogen recycling system, the pressure swing adsorption is coupled with the membrane separation, so that the hydrogen recycling rate is over 95 percent, and the hydrogen purity is over 99 percent.

Description

technical field [0001] The invention relates to a hydrogen recovery system coupled with pressure swing adsorption and membrane separation and a method thereof. Background technique [0002] Membrane separation technology is a new gas separation method developed in the past ten years. Its principle is to use the principle of selective permeation when the mixed gas passes through the polymer membrane. Different components have different permeability, and the gas components The driving force through the membrane is the pressure difference on both sides of the membrane. According to the difference in permeability of each component, the gas with higher permeability such as hydrogen is enriched on the permeation side of the membrane, while the gas with lower permeability is enriched. Collected on the non-permeated side, so as to achieve the purpose of separating the mixed gas. As the gas continues to permeate through the membrane, the components with lower permeability increase r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01B3/56
CPCC01B3/56C01B3/501C01B2203/048C01B2210/007
Inventor 李炜王永长张志宏方新刚广家旭张维
Owner PETROCHINA CO LTD
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