Gas making device based on pressure swing adsorption technology

Abstract

The utility model provides a gas making device based on pressure swing adsorption technology, which comprises a pressure swing adsorption unit, the pressure swing adsorption unit comprises a gas inlet pipeline, a gas outlet pipeline and an adsorption tower, one end of the gas inlet pipeline is communicated with the gas inlet end of the adsorption tower, the other end of the gas inlet pipeline is used for being communicated with a gas source, and the gas outlet pipeline is used for being communicated with the gas source. An air inlet valve is arranged on the air inlet pipeline; one end of the gas outlet pipeline is communicated with the gas outlet end of the adsorption tower, the other end of the gas outlet pipeline is used for being communicated with a downstream device, and a back pressure valve is arranged on the gas outlet pipeline; the air outlet pipeline is further connected with a bypass pipeline, the bypass pipeline is provided with a bypass valve, the two ends of the bypass pipeline are communicated with the air outlet pipeline respectively, and the back pressure valve is located between the two ends of the bypass pipeline. The problems that in the prior art, the pressure of product gas coming out of an adsorption tower is unstable, downstream use is affected, and the adsorption tower loses pressure are solved.

Description

Technical Field

[0001] The utility model relates to equipment for gas separation and purification, in particular to a gas making device based on pressure swing adsorption technology. Background Art

[0002] Pressure Swing Adsorption (PSA) is a new type of gas adsorption separation technology that works based on physical adsorption. The PSA process uses the contact between the solid adsorbent in the adsorbent bed and the inlet gas to selectively adsorb specific components in the mixed gas at a higher pressure, so that the product gas can reduce the adsorbed gas when it is enriched. That is, the pressure swing adsorption system needs to reach a certain working pressure before it can output qualified product gas. Therefore, during operation, in the early startup stage, a certain pressure value needs to be reached in the adsorption tower to open the outlet valve of the adsorption tower so that the product gas can be supplied to the downstream. However, during the current operation, the pressure of the product gas coming out of the adsorption tower sometimes fluctuates, which in turn affects the use of the downstream and causes pressure loss in the adsorption tower. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a gas production device based on pressure swing adsorption technology, which is used to solve the problem of unstable pressure of product gas coming out of the adsorption tower in the prior art, thereby affecting downstream use and causing pressure loss in the adsorption tower.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a gas making device based on pressure swing adsorption technology, including a pressure swing adsorption unit, the pressure swing adsorption unit including an air inlet pipeline, an air outlet pipeline and an adsorption tower, wherein one end of the air inlet pipeline is connected with the air inlet end of the adsorption tower, the other end of the air inlet pipeline is used to be connected with a gas source, and an air inlet valve is provided on the air inlet pipeline; one end of the air outlet pipeline is connected with the air outlet end of the adsorption tower, the other end of the air outlet pipeline is used to be connected with a downstream device, and a back pressure valve is provided on the air outlet pipeline; a bypass pipeline is also connected to the air outlet pipeline, and a bypass valve is provided on the bypass pipeline, and both ends of the bypass pipeline are respectively connected with the air outlet pipeline, and the back pressure valve is located between the two ends of the bypass pipeline.

[0005] Preferably, a first channel valve and a second on-off valve are respectively provided on the outlet pipeline and located at the front and rear sides of the back pressure valve, and the first on-off valve and the second on-off valve are both located between the two ends of the bypass pipeline.

[0006] Preferably, a first branch is provided on the air outlet pipeline and between the first on-off valve and the back pressure valve, and a third on-off valve is provided on the first branch; a second branch is provided on the air outlet pipeline and between the second on-off valve and the back pressure valve, and a fourth on-off valve is provided on the second branch

[0007] Preferably, a boundary cut-off valve is further provided on the air outlet pipeline, and the boundary cut-off valve is arranged behind the bypass pipeline and the back pressure valve.

[0008] Preferably, the back pressure valve is a self-operated regulating valve.

[0009] Preferably, the back pressure valve is a pneumatic regulating valve, and a pressure transmitter is further provided on the air outlet pipeline. The pressure transmitter is arranged in front of the pneumatic regulating valve, and the pressure transmitter is electrically connected to the pneumatic regulating valve.

[0010] As described above, the gas production device based on the pressure swing adsorption technology of the utility model has the following beneficial effects: when in use, since a back pressure valve is provided on the gas outlet pipeline, when the pressure in front of the back pressure valve is lower than the set value, the back pressure valve is always in a closed state, and the back pressure valve will only be opened after the pressure in front of the back pressure valve reaches the set value, thereby ensuring that the pressure of the product gas delivered to the downstream device is always kept stable, and at the same time ensuring that the pressure in the adsorption tower will not decrease, that is, will not lose pressure. In addition, if the back pressure valve on the gas outlet pipeline is damaged during operation, it is possible to temporarily choose to deliver the product gas to the downstream device through a bypass pipeline, thereby not causing operation interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shown is a schematic diagram of a gas production device based on pressure swing adsorption technology provided in the first embodiment of the present utility model.

[0012] Figure 2 Shown is a schematic diagram of a gas production device based on pressure swing adsorption technology provided in the second embodiment of the present utility model.

[0013] Description of Reference Numerals

[0014] 10 Intake pipe

[0015] 101 Intake valve

[0016] 20 Air outlet pipe

[0017] 200 Self-operated regulating valve

[0018] 201 First on-off valve

[0019] 202 Second on-off valve

[0020] 203 Third on-off valve

[0021] 204 Fourth on-off valve

[0022] 205 Limit cut-off valve

[0023] 21 Bypass line

[0024] 210 Bypass valve

[0025] 300 Pneumatic Control Valve

[0026] 400 Pressure Transmitter

[0027] 30 Adsorption tower DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] In the description of the present utility model, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] See also Figure 1 to Figure 2It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the utility model, and the drawings only show the components related to the utility model rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] The utility model provides a gas production device based on pressure swing adsorption technology, such as Figure 1 to Figure 2 As shown, the gas production device based on the pressure swing adsorption technology includes a pressure swing adsorption unit, which includes an air inlet pipeline 10, an air outlet pipeline 20 and an adsorption tower 30, wherein one end of the air inlet pipeline 10 is connected to the air inlet end of the adsorption tower 30, and the other end of the air inlet pipeline 10 is used to be connected to the gas source, and an air inlet valve 101 is provided on the air inlet pipeline 10; one end of the air outlet pipeline 20 is connected to the air outlet end of the adsorption tower 30, and the other end of the air outlet pipeline 20 is used to be connected to a downstream device, and a back pressure valve is provided on the air outlet pipeline 20, and a bypass pipeline 21 is also connected to the air outlet pipeline 20, and both ends of the bypass pipeline 21 are respectively connected to the air outlet pipeline 20, and the back pressure valve is located between the two ends of the bypass pipeline 20, and a bypass valve 210 is also provided on the bypass pipeline 21.

[0033] When the gas production device based on the pressure swing adsorption technology of the utility model is used, Figure 1 As shown, the raw gas in the gas source enters the adsorption tower 30 through the air inlet pipeline 10, and the product gas enriched by pressure swing adsorption in the adsorption tower 30 is passed from the air outlet pipeline 20 to the downstream device. For example, the product gas produced by the pressure swing adsorption technology is hydrogen, and the downstream device is a device that needs hydrogen. In the utility model, since a back pressure valve is provided on the air outlet pipeline 20, when the pressure before the back pressure valve is lower than the set value, the back pressure valve is always in a closed state, and the back pressure valve will only be opened after the pressure before the back pressure valve reaches the set value, so that the pressure of the product gas delivered to the downstream device can always be kept stable, and at the same time, the pressure in the adsorption tower can be ensured not to decrease, that is, there will be no pressure loss. In addition, if the back pressure valve on the air outlet pipeline 20 is damaged during the operation, it is possible to temporarily choose to deliver the product gas to the downstream device through the bypass pipeline 21, so as not to cause the operation to be interrupted.

[0034] Embodiment 1

[0035] Specifically, Figure 1As shown, in the first embodiment, the back pressure valve is a self-operated regulating valve 200. The self-operated regulating valve 200 has a simple structure and low cost. During operation, when the gas pressure in the outlet pipeline in front of the self-operated regulating valve 200 is less than the set pressure value, the self-operated regulating valve 200 will always remain in a closed state. When the gas pressure in the outlet pipeline in front of the self-operated regulating valve 200 is greater than the set pressure value, the gas pressure will push the self-operated regulating valve 200 open, thereby realizing the opening of the self-operated regulating valve 200.

[0036] Further, in order to facilitate the later maintenance of the back pressure valve, i.e., the self-operated regulating valve 200, preferably, as Figure 1 As shown, a first on-off valve 201 and a second on-off valve 202 are respectively provided on the outlet pipeline 20 and located at the front and rear sides of the back pressure valve, i.e., the self-operated regulating valve 200, and the first on-off valve 201 and the second on-off valve 202 are both located between the two ends of the bypass pipeline 21. With this structural design, when the back pressure valve 200 is damaged, the first on-off valve 201 and the second on-off valve 202 can be closed, and then the back pressure valve 200 can be disassembled for inspection or replacement, and at this time, the bypass valve 210 on the bypass pipeline 21 can be opened, and the product gas can be temporarily transported to the downstream device through the bypass pipeline 21.

[0037] Further, such as Figure 1 As shown, in the first embodiment, a first branch is provided on the air outlet pipeline 20 and located between the first on-off valve 201 and the back pressure valve, i.e., the self-operated regulating valve 200, and a third on-off valve 203 is provided on the first branch. A second branch is also provided on the air outlet pipeline 20 and located between the second on-off valve 202 and the self-operated regulating valve, and a fourth on-off valve 204 is provided on the second branch. Through this structural design, when the repaired back-pressure valve or a new back-pressure valve is reinstalled on the air outlet pipeline 20, a small amount of air will exist in the section of the pipeline between the first on-off valve 201 and the second on-off valve 202. Through the setting of the first branch and the second branch, when the back-pressure valve is installed on the air outlet pipeline 20, by opening the third on-off valve 203 on the first branch and the fourth on-off valve 204 on the second branch, and then filling the air outlet pipeline with nitrogen through the first branch (at this time, the first on-off valve 201 and the second on-off valve 202 are in a closed state), the air in the section of the pipeline between the first on-off valve 201 and the second on-off valve 202 can be discharged from the second branch to the outside, thereby avoiding bringing air into the combustible gas system and ensuring the safety of the combustible system.

[0038] Further, such as Figure 1As shown, in the first embodiment, a boundary cut-off valve 205 is further provided on the gas outlet pipeline 20, and the boundary cut-off valve 205 is arranged behind the bypass pipeline 21 and the back pressure valve, i.e., the self-operated regulating valve 200, i.e., the boundary cut-off valve 205 is arranged at the end of the gas outlet pipeline 20. With this structural design, when the downstream device does not need product gas, the boundary cut-off valve 205 can be closed, thereby isolating the pressure swing adsorption unit and the downstream device as a whole.

[0039] Embodiment 2

[0040] The difference between the second embodiment and the first embodiment is that the back pressure valve is different. Figure 2 As shown, in the second embodiment, the back pressure valve is a pneumatic regulating valve 300, and accordingly, a pressure transmitter 400 is also provided on the outlet pipeline 20, and the pressure transmitter 400 is arranged in front of the pneumatic regulating valve 300, and the pressure transmitter 400 is electrically connected to the pneumatic regulating valve 300. Through this structural design, during operation, the pressure transmitter 400 detects the pressure in the outlet pipeline in front of the back pressure valve, i.e., the pneumatic regulating valve 300, in real time. When the pressure in front of the pneumatic regulating valve 300 is less than the set pressure value, the pneumatic regulating valve 300 remains in a closed state. When the pressure transmitter 400 detects that the pressure in front of the pneumatic regulating valve 300 reaches the set pressure value, the pressure transmitter 400 sends a control signal to the pneumatic regulating valve 300, and the pneumatic regulating valve 300 opens the valve based on the control signal. Compared with the above-mentioned first embodiment, the second embodiment is more precise by adopting a pneumatic regulating valve, and can further improve the stability of the product gas pressure.

[0041] In summary, the gas production device based on pressure swing adsorption technology of the utility model can ensure that the pressure of the product gas delivered to the downstream device is always kept stable, and can ensure that the pressure in the adsorption tower will not lose pressure, thereby improving the stability of the pressure swing adsorption process. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0042] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A gas production device based on pressure swing adsorption technology, characterized in that: include: A pressure swing adsorption unit, the pressure swing adsorption unit comprises an air inlet pipeline, an air outlet pipeline and an adsorption tower, wherein one end of the air inlet pipeline is connected to the air inlet end of the adsorption tower, the other end of the air inlet pipeline is used to be connected to an air source, and an air inlet valve is provided on the air inlet pipeline; one end of the air outlet pipeline is connected to the air outlet end of the adsorption tower, the other end of the air outlet pipeline is used to be connected to a downstream device, and a back pressure valve is provided on the air outlet pipeline; a bypass pipeline is also connected to the air outlet pipeline, and a bypass valve is provided on the bypass pipeline, and both ends of the bypass pipeline are respectively connected to the air outlet pipeline, and the back pressure valve is located between the two ends of the bypass pipeline.

2. A gas production device based on pressure swing adsorption technology according to claim 1, characterized in that: A first on-off valve and a second on-off valve are respectively provided on the outlet pipeline and located at the front and rear sides of the back pressure valve. The first on-off valve and the second on-off valve are both located between the two ends of the bypass pipeline.

3. A gas production device based on pressure swing adsorption technology according to claim 2, characterized in that: A first branch is also provided on the air outlet pipeline and between the first on-off valve and the back-pressure valve, and a third on-off valve is provided on the first branch; a second branch is also provided on the air outlet pipeline and between the second on-off valve and the back-pressure valve, and a fourth on-off valve is provided on the second branch.

4. The gas production device based on pressure swing adsorption technology according to claim 1, characterized in that: The air outlet pipeline is also provided with a boundary cut-off valve, and the boundary cut-off valve is arranged behind the bypass pipeline and the back pressure valve.

5. A gas production device based on pressure swing adsorption technology according to any one of claims 1 to 4, characterized in that: The back pressure valve is a self-operated regulating valve.

6. A gas production device based on pressure swing adsorption technology according to any one of claims 1 to 4, characterized in that: The back pressure valve is a pneumatic regulating valve. A pressure transmitter is also provided on the air outlet pipeline. The pressure transmitter is arranged in front of the pneumatic regulating valve. The pressure transmitter is electrically connected to the pneumatic regulating valve.

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