CN117208849B - A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its process - Google Patents
A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its processInfo
- Publication number
- CN117208849B CN117208849B CN202311206368.9A CN202311206368A CN117208849B CN 117208849 B CN117208849 B CN 117208849B CN 202311206368 A CN202311206368 A CN 202311206368A CN 117208849 B CN117208849 B CN 117208849B
- Authority
- CN
- China
- Prior art keywords
- adsorption
- tower
- pressure
- tank
- adsorption tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Separation Of Gases By Adsorption (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
本发明属于变压吸附装置、氢气提纯技术领域，具体涉及一种多塔高效变压吸附提纯制氢系统及其工艺。包括：第一吸附塔、第二吸附塔、第三吸附塔、第四吸附塔、真空泵、原料气缓冲罐、解析气缓冲罐、产品气缓冲罐、均压罐和顺放罐；通过改变了产品气的路径，进而实现了只有四个吸附塔的情况下就可以进行两个吸附塔同时吸附，增大装置的生产能力，同时采用抽真空和冲洗两种方式相结合的吸附剂再生方式，缓解了现有工艺只有在不少于六床变压吸附才能实现多塔同时吸附的现状，同时解决了现有技术仅采用真空流程在抽真空再生末期再生效果减弱，吸附剂再生效果不彻底的问题。
This invention belongs to the field of pressure swing adsorption (PSA) devices and hydrogen purification technology, specifically relating to a multi-tower high-efficiency PSA hydrogen production system and its process. It includes: a first adsorption tower, a second adsorption tower, a third adsorption tower, a fourth adsorption tower, a vacuum pump, a feed gas buffer tank, a desorption gas buffer tank, a product gas buffer tank, a pressure equalization tank, and a forward discharge tank. By changing the product gas path, it achieves simultaneous adsorption in two adsorption towers with only four adsorption towers, increasing the unit's production capacity. Furthermore, it employs a combined vacuum and flushing method for adsorbent regeneration, alleviating the limitation of existing processes requiring at least six PSA beds for simultaneous multi-tower adsorption. It also solves the problem of weakened regeneration efficiency and incomplete adsorbent regeneration at the end of the vacuum regeneration process in existing technologies that rely solely on vacuum processes.
Description
Technical Field
The invention belongs to the technical field of pressure swing adsorption devices and hydrogen purification, and particularly relates to a multi-tower efficient pressure swing adsorption purification hydrogen production system and a process thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
Hydrogen is one of the most ideal energy sources in the future, and has the advantages of high efficiency, cleanness, no pollution and renewable circulation. The pressure swing adsorption technology is a main technical means for purifying and preparing hydrogen at present, is a novel technology for carrying out gas adsorption and separation in a pressure swing adsorption mode, has important significance for preparing high-purity hydrogen, and has the advantages of simple process flow, high operation flexibility, high reliability, high operation elasticity and high automation degree.
In the existing pressure swing adsorption process, the single adsorption tower is intermittent because the adsorbent needs to be regenerated. Two or more adsorbent beds are used in industry, and adsorption and regeneration of the adsorbent beds are alternately performed. However, since the adsorption towers are in a generalized regeneration state longer than the adsorption state, and a pressure equalizing operation is required, the adsorption operation is performed simultaneously by two adsorption towers at some time of the pressure swing adsorption cycle, which occurs only in at least six-bed pressure swing adsorption processes, for example, six-tower operation-two-tower adsorption, i.e., six adsorption towers are operated, wherein two adsorption towers are in an adsorption state, and the rest adsorption towers are in a generalized regeneration state.
The production capacity of the device can be increased by feeding multiple towers simultaneously, but the mode of adding multiple adsorption towers is needed, so that the overall equipment cost is increased, meanwhile, multiple pipelines and multiple program control valves are added, the risk of equipment failure is increased, and the later management and maintenance are not facilitated.
Meanwhile, in the actual engineering operation, the problem that the regeneration effect is weakened at the end of vacuumizing is found in the existing pressure swing adsorption process even if a vacuumizing regeneration mode is adopted, so that the adsorbent is not regenerated thoroughly, and the purity of the product gas and the recovery rate of hydrogen are reduced. In addition, if the vacuumizing system fails, the adsorbent regeneration cannot be performed, and the whole pressure swing adsorption device cannot operate.
In summary, the problem that the production capacity of the device needs to be improved is solved by aiming at the high cost of the existing six-tower operation-two-tower adsorption equipment. There is an urgent need to develop a system that can perform simultaneous adsorption of two adsorption towers using only four adsorption towers to increase the throughput of the apparatus.
Disclosure of Invention
In order to solve the problems, the invention provides the multi-tower efficient pressure swing adsorption purification hydrogen production system and the process thereof, which change the path of the product gas, release the product gas to a pressure equalizing tank through a primary pressure equalizing drop part after the adsorption is finished, release the product gas to other adsorption towers through a secondary pressure equalizing drop part, prolong the adsorption time through the two release and the buffering of the pressure equalizing tank, further realize the simultaneous adsorption of two adsorption towers under the condition of only four adsorption towers, increase the production capacity of the device, and simultaneously solve the problems that the prior art only adopts a vacuum flow to weaken the regeneration effect at the end of the vacuumizing regeneration and the regeneration effect of the adsorbent is not thorough by adopting an adsorbent regeneration mode combining vacuumizing and flushing modes.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
In a first aspect of the invention, a multi-tower high-efficiency pressure swing adsorption purification hydrogen production system is provided, comprising at least four adsorption towers;
the inlet ends of the adsorption towers are respectively connected with an air inlet pipeline and a vacuumizing pipeline, and the outlet ends of the adsorption towers are respectively connected with a pressure equalizing tank and a sequential discharge tank;
Two adsorption towers are simultaneously in an adsorption state in each period.
In some embodiments, the pressure equalizing tank performs one pressure equalizing and pressure equalizing on the adsorption tower and one pressure equalizing and pressure equalizing step;
in some embodiments, the hold-down tank holds down and purges the adsorption column.
In some embodiments, the feed gas enters the first adsorption tower, the second adsorption tower, the third adsorption tower, and the fourth adsorption tower from the feed gas buffer tank, respectively.
In some embodiments, the device further comprises a vacuum pump, wherein after the forward discharge is finished, the impurity gas adsorbed in the adsorption tower is reversely vacuumized and is discharged as the desorption gas through the desorption gas buffer tank.
In some embodiments, after the evacuation is completed, the adsorption tower is connected to a forward tank, and the gas in the forward tank flows into the adsorption tower from the forward tank, is pumped out by a vacuum pump as purge waste gas, and is discharged through a desorption gas buffer tank.
In some embodiments, after purging, the adsorption tower is disconnected from the forward tank, and the adsorption tower is connected with other adsorption towers to perform secondary pressure equalization.
In some embodiments, after the secondary pressure equalization is finished, the adsorption tower is disconnected from other adsorption towers, and the adsorption tower is connected with the pressure equalization tank to perform primary pressure equalization.
In some embodiments, after the one-time pressure equalization is finished, the connection between the adsorption tower and the pressure equalization tank is disconnected, so that the raw material gas is subjected to final pressure equalization on the adsorption tower through the air inlet pipeline.
In some embodiments, valves are provided on each device and on the piping between each device.
The invention also provides a multi-tower high-efficiency pressure swing adsorption purification hydrogen production process, which adopts the system to produce hydrogen, and comprises the following steps:
The method comprises the steps of allowing raw material gas to pass through a raw material gas buffer tank at normal temperature and then enter adsorption towers at a certain pressure, wherein each adsorption tower is filled with an adsorbent, and each adsorption tower sequentially undergoes the procedures of adsorption, pressure equalizing and reducing, sequential discharging, vacuumizing, purging, pressure equalizing and lifting and final pressure lifting, and two adsorption towers are simultaneously in an adsorption state in each period of time and are circularly carried out to obtain the catalyst;
Wherein, the product gas is released to the pressure equalizing tank through the primary pressure equalizing and reducing part, and then is released to other adsorption towers through the secondary pressure equalizing and reducing part.
In some embodiments, the pressure fluctuation of the vacuum pump is controlled to be 35-50 kpaa.
The third aspect of the invention also provides the application of the multi-tower efficient pressure swing adsorption purification hydrogen production system in gas treatment.
The beneficial effects of the invention are that
The invention provides a multi-tower high-efficiency pressure swing adsorption purification hydrogen production system and a process thereof, wherein different process flows are designed by selecting time of steps, so that the production capacity of a device can be improved, the investment is reduced, and the purity of product gas and the recovery rate of hydrogen are improved. In particular, the invention has the advantages that:
1. The invention utilizes the equalizing tank and the sequential discharging tank to simulate the PSA circulation flow of multiple towers in cooperation with the adsorption tower, purifies the hydrogen, greatly reduces the production cost of the multiple towers, simultaneously realizes the simultaneous adsorption of two towers by controlling the switch of the valve to set four-tower process time sequence steps, improves the production capacity of the system, reduces the investment and the operation cost and reduces the equipment failure risk.
2. The adsorbent regeneration process adopts a regeneration mode of combining vacuumizing and purging, and the purging is performed at the middle and later stages of the adsorbent regeneration stage, so that the adsorbent is regenerated more thoroughly, the impurity content is lower, and the adsorbent regeneration effect is better. Even when the vacuum system fails, the reverse discharging and purging processes can be operated, so that the pressure swing adsorption system can still operate stably.
3. The pressure swing adsorption technology adopted by the invention circulates according to the time sequence of adsorption, primary pressure drop equalizing, secondary pressure drop equalizing, sequential discharge, vacuumizing, purging, secondary pressure drop equalizing and rising, primary pressure drop equalizing and final pressure rising, and realizes three pressure drops by using a pressure equalizing tank and a tower pressure equalizing and sequential discharge tank, so that the pressure fluctuation range of the system flow is reduced, and the pressure fluctuation and noise of the vacuum pump are smaller.
4. The system and the process can realize gas separation under the conditions of normal temperature and low pressure, and have the characteristics of small device, high production capacity, high product gas purity, high automation degree, low fault risk, low maintenance cost and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a multi-tower high efficiency pressure swing adsorption purification hydrogen production system and process thereof;
A. A first adsorption tower; B, a second adsorption tower, C, a third adsorption tower, D, a fourth adsorption tower, 1, a raw material gas buffer tank, 2, a product gas buffer tank, 3, a desorption gas buffer tank, 4, a pressure equalizing tank, 5, a sequential discharge tank, 6, and a vacuum pump.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
As shown in fig. 1, the embodiment provides a multi-tower efficient pressure swing adsorption purification hydrogen production system and a process thereof, wherein the system comprises a first adsorption tower a, a second adsorption tower B, a third adsorption tower C, a fourth adsorption tower D, a raw material gas buffer tank 1, a product gas buffer tank 2, a desorption gas buffer tank 3, a pressure equalizing tank 4, a forward discharge tank 5, a vacuum pump 6 and pipelines and valves connected with each other;
The method comprises the steps of connecting a raw material gas inlet with an inlet end of a raw material gas buffer tank 1, connecting outlet ends of the raw material gas buffer tank 1 with inlet ends of bottoms of a first adsorption tower A, a second adsorption tower B, a third adsorption tower C and a fourth adsorption tower D, connecting inlet ends of bottoms of the first adsorption tower A, the second adsorption tower B, the third adsorption tower C and the fourth adsorption tower D with vacuumizing pipelines, connecting vacuumizing pipelines with an inlet end of a vacuum pump 6, connecting outlet ends of the vacuum pump 6 with an inlet end of an analysis gas buffer tank 3, connecting outlet ends of tops of the first adsorption tower A, the second adsorption tower B, the third adsorption tower C and the fourth adsorption tower D with outlet ends of a product gas buffer tank 2, connecting outlet ends of the first adsorption tower A, the second adsorption tower B, the third adsorption tower C and the fourth adsorption tower D with primary pipelines, connecting outlet ends of tops of the first adsorption tower A, the second adsorption tower B, the third adsorption tower C and the fourth adsorption tower D with secondary pipelines, and equalizing pressure ends of tops of the first adsorption tower B, the third adsorption tower C and the fourth adsorption tower D with equalizing pressure pipelines along outlet ends of a equalizing pressure equalizing pipelines.
The cycle sequences of the pressure swing adsorption system and the process used in this example are shown in table 1.
TABLE 1 cycle time sequence for four tower high efficiency pressure swing adsorption hydrogen production process
Note that adsorption a, ED/ER pressure drop/equalization boost, PP forward, V vacuum, P purge, FR final boost;
As shown in table 1, each column was in a different operating state during each period of the pressure swing adsorption process, and it was ensured that two adsorption columns were simultaneously in an adsorption state during each period. Each adsorption tower carries out the same cycle time sequence, taking tower A as an example, and explaining the pressure swing adsorption process in the section:
(1) And (3) adsorbing, namely opening a program control valve of an air inlet pipeline of the tower A, allowing raw material gas to enter an adsorption tower A after passing through a raw material gas buffer tank 1, adsorbing impurity gas in the raw material gas by an adsorbent under adsorption pressure, and allowing unadsorbed hydrogen to enter a product gas buffer tank 2 through a product gas pipeline program control valve. When the adsorption front of impurity reaches a certain position of the adsorption tower, the air inlet program control valve is closed, the raw material gas stops being input into the adsorption tower A, and the pressure in the adsorption is kept in the tower.
(2) And (3) pressure equalization once, namely after the adsorption step of the A tower is stopped, opening a pipeline program control valve connected with the pressure equalizing tank 4 to enable the outlet end of the A tower to be communicated with the pressure equalizing tank 4, and enabling the dead space gas in the A tower to flow into the pressure equalizing tank 4 from the outlet end of the A tower through the program control valve. At the end of this step, the a column and pressure equalization tank 4 pressures are substantially equalized. (3) And after the primary pressure equalizing drop of the A tower is finished, closing the pipeline control valve connected with the pressure equalizing tank 4, and opening the pipeline control valve connected with the A tower and the D tower to ensure that the outlet end of the A tower is communicated with the outlet end of the D tower which is just finished in regeneration, and the dead space gas in the A tower flows into the D tower from the outlet end of the A tower. At the end of this step, A, D the two columns pressure was substantially equalized.
(4) And c, after the step of secondary pressure equalization and drop of the tower A is stopped, closing a pipeline program control valve connected with the tower D, and opening the pipeline program control valve connected with the tower A and the forward tank 5 to ensure that the outlet end of the tower A is communicated with the inlet end of the forward tank 5, and dead air in the tower A flows into the forward tank 5 from the outlet end of the tower A. At the end of this step, the column a and the hold-down tank 5 pressures are substantially equalized.
(5) And (3) vacuumizing, namely after the sequential discharging step of the tower A is finished, closing a pipeline program control valve connected with the sequential discharging tank 5, opening the pipeline program control valve connected with the vacuum pump by the tower A, and opening the vacuum pump 6 to reversely vacuumize the impurity gas adsorbed in the tower, discharging the impurity gas as the resolved gas through the resolved gas buffer tank 3, wherein most of the adsorbed impurity gas is desorbed in the process, and regenerating the adsorbent to a certain degree.
(6) And after the vacuumizing step is finished, opening a pipeline program control valve connected with the forward tank 5 to enable the outlet end of the A tower to be communicated with the inlet end of the forward tank 5, keeping the vacuum pump 6 open, and enabling gas in the forward tank to flow into the A tower from the outlet end of the forward tank to be pumped out through the vacuum pump as sweeping waste gas and be discharged out of the system through the analysis gas buffer tank 3. At the end of this step, the regeneration of the a-column is complete.
(7) And (3) carrying out secondary pressure equalizing and lifting, namely closing a pipeline program control valve connected with the forward discharge tank 5, closing a pipeline program control valve connected with the vacuum pump, and opening a pipeline program control valve connected with the tower A and the tower B to ensure that the outlet end of the tower A is communicated with the outlet end of the tower B. And (3) enabling the gas in the tower B to flow into the tower A, equalizing the pressure of the tower A, and enabling the pressure of the tower B to be basically equal to the pressure of the tower A after the step is finished.
(8) And (3) carrying out primary pressure equalization and lifting, namely preparing for further lifting after the tower A completes the secondary pressure equalization and lifting process. And closing the pipeline program control valve connected with the tower A and the tower B, and opening the pipeline program control valve connected with the tower A and the pressure equalizing tank 4 to ensure that the outlet end of the tower A is communicated with the pressure equalizing tank 4. The pressure equalizing tank stores gas flowing in when the pressure of the tower B is equalized once in the previous time sequence, the gas in the pressure equalizing tank 4 enters the tower A to equalize the pressure of the tower A, and the pressure of the pressure equalizing tank 4 is basically equal to the pressure of the tower A after the step is finished.
(9) And final pressure rise, namely after the tower A undergoes the pressure equalizing step, the pressure in the tower does not reach the working pressure of the adsorption step yet. At this time, the A tower is closed, the pipeline program control valve connected with the equalizing tank 4 is opened, the A tower air inlet pipeline program control valve is opened, and the A tower is finally boosted by the raw material gas until the pressure of the A tower basically reaches the adsorption pressure. The steps of the column a in one cycle are all completed, and the next cycle is started immediately.
Further, the pressure fluctuation of the vacuum pump 6 is controlled to be 35-50 kPaA.
The multi-tower efficient pressure swing adsorption hydrogen production system and the process thereof can realize simultaneous adsorption of two adsorption towers at any time sequence by designing different process flows of four adsorption towers matched with a pressure equalizing tank and a sequential discharging tank, reduce investment and improve production capacity of the device, adopt an adsorbent regeneration mode of combining vacuumizing and purging, enable the adsorbent to be regenerated more thoroughly, improve purity of product gas and hydrogen recovery rate, and have simple operation process, gentle pressure lifting and low vacuum pump noise, thus being suitable for industrial production.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311206368.9A CN117208849B (en) | 2023-09-18 | 2023-09-18 | A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311206368.9A CN117208849B (en) | 2023-09-18 | 2023-09-18 | A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117208849A CN117208849A (en) | 2023-12-12 |
| CN117208849B true CN117208849B (en) | 2025-11-18 |
Family
ID=89047745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311206368.9A Active CN117208849B (en) | 2023-09-18 | 2023-09-18 | A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117208849B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208049671U (en) * | 2018-03-06 | 2018-11-06 | 成都科特瑞兴科技有限公司 | A kind of device improving recycling hydrogen purity |
-
2023
- 2023-09-18 CN CN202311206368.9A patent/CN117208849B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208049671U (en) * | 2018-03-06 | 2018-11-06 | 成都科特瑞兴科技有限公司 | A kind of device improving recycling hydrogen purity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117208849A (en) | 2023-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0681859B1 (en) | Vacuum swing adsorption process with mixed repressurization and provide product depressurization | |
| WO2022068165A1 (en) | Efficient vpsa oxygen production process and system thereof | |
| CN112919414A (en) | Low-pressure flushing regeneration pressure swing adsorption hydrogen purification system and hydrogen purification method | |
| CN113457373B (en) | VPSA oxygen production process and system using adsorbent efficiently | |
| CN103058144B (en) | Vacuum pressure swing adsorption oxygen generation system and control method thereof | |
| CN112004774B (en) | Method for producing oxygen by adopting pressure swing adsorption technology | |
| CN102500190B (en) | A kind of cleaning and recovering process for enriched gas source | |
| CN111871149B (en) | Two-stage pressure swing adsorption system for recovering adsorbed components and application method thereof | |
| CN111204712B (en) | System for separating and purifying hydrogen by pressure swing adsorption gas and separation and purification method thereof | |
| CN117208849B (en) | A multi-tower high-efficiency pressure swing adsorption (PSA) purification hydrogen production system and its process | |
| CN208829260U (en) | Pressure swing adsorption hydrogen production system | |
| CN119215611A (en) | A VPSA oxygen production device and oxygen production method thereof | |
| US20240307812A1 (en) | Method and device for stepwise pressure-equalized pressure swing adsorption (psa) gas separation by changing paths | |
| CN219942316U (en) | Three-tower vacuum pressure swing adsorption system | |
| CN108793077A (en) | Pressure swing adsorption hydrogen production system | |
| CN115770462A (en) | System and method for recovering carbon dioxide from flue gas | |
| CN116272251A (en) | A two-tower series pressure swing adsorption device and its adsorption process | |
| CN116351204A (en) | A three-tower vacuum pressure swing adsorption system and its process | |
| CN116251442A (en) | A skid-mounted coalbed methane vacuum pressure swing adsorption method | |
| CN220609748U (en) | Pressure swing adsorption pressure equalizing recovery system | |
| CN102114377B (en) | Pressure swing adsorption gas separation device and control method thereof | |
| CN111989148B (en) | Method for producing oxygen via O2 VSA, minimizing opening and closing of valves | |
| CN213294685U (en) | Efficient VPSA system oxygen system | |
| CN215403093U (en) | VPSA oxygen generation system for efficiently utilizing adsorbent | |
| CN219744383U (en) | A pressure swing adsorption process system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |