Method and system for jointly treating refinery gas by adopting membrane separation and pressure swing adsorption

A pressure swing adsorption and combined treatment technology, applied in the direction of using solid contact hydrogen separation, hydrogen separation, etc., can solve the problems of insufficient hydrogen treatment capacity, complicated control steps, low hydrogen purity, etc., to improve the hydrogen recovery effect and solve the problem of hydrogen source. Stressful, high hydrogen purity effect

Active Publication Date: 2015-04-08
PETROCHINA CO LTD +1
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Problems solved by technology

The main processes of hydrogen recovery are membrane separation and pressure swing adsorption, both of which have their own characteristics: the membrane separation method has the characteristics of modularization, simple installation, no moving parts, simple maintenance, high recovery rate and large operating flexibility, but the raw material hydrogen concentration When the purity of the hydrogen product is low, the purity of the hydrogen product cannot meet the requirements of the hydrogen network; the pressure swing adsorption method is flexible in operation and can obtain high-purity hydrogen, but its control steps are complicated and the expansion of the device is difficult
[0004] At present, the main hydrogen purification and recovery process in the refinery

Method used

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  • Method and system for jointly treating refinery gas by adopting membrane separation and pressure swing adsorption

Examples

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Embodiment 1

[0040] This example provides a system for combined treatment of refinery gas using membrane separation and pressure swing adsorption, the schematic diagram of which is shown in figure 1 As shown, the system includes:

[0041]Pressure swing adsorption device 1, first pretreatment device 2, first membrane separation device 3, second pretreatment device 4, second membrane separation device 5, first compressor 6, second compressor 7, reformed hydrogen pipe Road A, low-pressure hydrogen-poor gas pipeline B, low-pressure hydrogen-rich gas pipeline C, high-pressure hydrogen-poor gas pipeline D, high-pressure hydrogen-rich gas pipeline E, hydrogen outlet pipeline F of pressure swing adsorption device 1, the first membrane The hydrogen outlet pipeline G of the separation device 3, the retentate gas pipeline H of the second membrane separation device 5, the retentate gas pipeline I of the first membrane separation device 3, and the analytical gas pipeline J of the pressure swing adsorpt...

Embodiment 2

[0046] This embodiment provides a method for processing refinery gas using the system of Embodiment 1. According to the different requirements of the membrane separation device and the pressure swing adsorption device of Embodiment 1 on the composition and pressure of the feed gas, multiple streams of hydrogen-containing gas are divided into into five categories:

[0047] (1) reforming hydrogen, the pressure is 2.4MPa, the hydrogen concentration is 91.60vol%, it is divided into two shares, one is 40% of the reformed hydrogen total amount, and the other is 60%;

[0048] (2) Low-pressure hydrogen-poor gas with a pressure of 0.4MPa and a hydrogen concentration of 60.44vol%;

[0049] (3) Low-pressure hydrogen-rich gas with a pressure of 0.7MPa and a hydrogen concentration of 87.13vol%;

[0050] (4) High-pressure hydrogen-poor gas, the pressure is 2.5MPa, and the hydrogen concentration is 43.40vol%;

[0051] (5) High-pressure hydrogen-rich gas with a pressure of 2.35MPa and a hyd...

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Abstract

The invention provides a method and a system for jointly treating a refinery gas by adopting membrane separation and pressure swing adsorption. According to the method, multiple refinery gases are sorted as reforming hydrogen, a low-pressure hydrogen-poor gas, a low-pressure hydrogen-rich gas, a high-pressure hydrogen-poor gas and a high-pressure hydrogen-rich gas according to different requirements of a membrane separation device and a pressure swing adsorption device on the composition and pressure of a feed gas; hydrogen is recovered from the reforming hydrogen through the membrane separation device or the pressure swing adsorption device; the low-pressure hydrogen-poor gas and the high-pressure hydrogen-poor gas are purified through the membrane separation device and then hydrogen is recovered through the pressure swing adsorption device; and hydrogen is recovered from the high-pressure hydrogen-rich gas and the low-pressure hydrogen-rich gas through the pressure swing adsorption device. The invention also provides a system for the method. The method and system which are provided by the invention have the characteristics of high hydrogen purity and high recovery rate, are suitable for the yield increase of an old device and high in operating flexibility and can achieve the recovered hydrogen purity more than 99vol/% and the recovery rate more than 95%.

Description

technical field [0001] The invention belongs to the field of recovery and treatment of refinery gas, and in particular relates to a method and system for jointly treating refinery gas by using membrane separation and pressure swing adsorption. Background technique [0002] Refinery demand for hydrogen has increased significantly as fuel cleanliness requirements have become increasingly stringent. Oil refineries use hydrogenation technology to further process and treat oil products, and the process consumes a lot of hydrogen. However, due to equipment and process limitations, many hydrogen-facing devices discharge a large amount of hydrogen-rich refinery gas into the gas pipeline network. This part of hydrogen has not been recycled, which not only increases the cost of hydrogen production, but also reduces the calorific value of the gas pipeline network. The problem affected the normal production of the refinery. [0003] Efficient and high-quality recovery of hydrogen from...

Claims

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Application Information

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IPC IPC(8): C01B3/56
Inventor 贺高红陈博阮雪华肖武姜晓滨李保军
Owner PETROCHINA CO LTD
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