Hydrogen membrane purification system based on rotary valve control gas circuit

Abstract

The invention provides a hydrogen membrane purification system based on a rotary valve control gas path, and relates to the technical field of methanol hydrogen production, the system comprises a membrane purifier, a rotary multi-way valve and a servo motor, in the membrane purifier operation process, crude hydrogen is introduced into a membrane purifier tube pass 1 interface, product hydrogen permeates to a shell pass 2 interface and a shell pass 3 interface through a palladium metal membrane, and the membrane purifier tube pass 1 interface and the shell pass 2 interface are connected with a shell pass 3 interface; residual tail gas output by the membrane purifier flows out from an interface tube pass 4 on the other side of the tube pass and is respectively connected into a rotary multi-way valve; the rotary multi-way valve plate is composed of a movable valve plate and a static valve plate, a plurality of gas paths are arranged on one side of the static valve plate and comprise a product gas outlet, a tail gas outlet, an emptying outlet, a vacuumizing opening, a nitrogen inlet and a crude hydrogen inlet gas path, a plurality of independent passages are arranged in the movable valve plate, and the movable valve plate is connected with the gas paths, a tube pass connector and a shell pass connector through the rotary multi-way valve static valve plate. The servo motor is used for controlling the angle of the movable valve plate, so that quick switching among blowing, vacuumizing and normal operation states of the membrane purifier is realized, and the volume of a gas circuit and control equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of methanol-to-hydrogen technology, specifically to a hydrogen membrane purification system based on a rotary valve-controlled gas path. Background Technology

[0002] Metal membrane hydrogen purification technology boasts advantages such as high hydrogen purity, compact equipment size, and high hydrogen yield. Commonly used metal purification membranes are made of materials like palladium alloys, vanadium alloys, and niobium alloys. These materials generally suffer from hydrogen embrittlement in low-temperature hydrogen-containing environments (0-300℃). Simultaneously, at high temperatures, oxygen in the air can oxidize some metal components in the alloy materials, reducing the membrane's surface activity. Furthermore, different membrane support structures have specific requirements regarding the pressure difference and direction of the gas flow due to their mechanical properties. To ensure the service life of the metal membrane module, hydrogen membrane purification equipment is designed with three states: start-up, operation, and shutdown. The start-up phase includes vacuuming, heating, and pressure holding steps, while the shutdown phase includes vacuuming and nitrogen purging. During normal operation, the metal membrane needs to be kept warm, and the crude hydrogen needs to be preheated. The entire process involves vacuuming, nitrogen purging, purging, and hydrogen purification. Related technologies typically employ valve control in metal membrane purification equipment, which suffers from complex control logic, large gas pipelines and valves, and slow response speed. Summary of the Invention

[0003] This application proposes a hydrogen membrane purification system based on a rotary valve-controlled gas path.

[0004] One embodiment of this application proposes a hydrogen membrane purification system based on a rotary valve-controlled gas path. The hydrogen membrane purification system includes a membrane purifier, a rotary multi-way valve, and a servo motor, wherein:

[0005] The membrane purifier is divided into two parts: the tube side and the shell side. During the operation of the membrane purifier, crude hydrogen is introduced into the tube side 1 interface of the membrane purifier, and the product hydrogen permeates through the palladium metal membrane to the shell side 2 interface and the shell side 3 interface. The residual tail gas output by the membrane purifier flows out from the other side interface of the tube side, tube side 4, and the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces are respectively connected to rotary multi-way valves.

[0006] The rotary multi-way valve plate consists of a moving valve plate and a stationary valve plate. The stationary valve plate has multiple gas passages on one side, including a product gas outlet, a tail gas outlet, an vent outlet, a vacuum port, a nitrogen inlet, and a crude hydrogen inlet gas passage. On the other side, pipes 1, 2, 3, and 4 are respectively connected to the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces of the membrane purifier. The moving valve plate contains multiple independent passages for connecting the multiple gas passages of the stationary valve plate and pipes 1, 2, 3, and 4.

[0007] The servo motor is connected to the rotary multi-way valve plate and is used to control the rotation of the moving valve plate to connect the target outlet gas path and the target pipe side and / or target shell side interface required in the stationary valve plate.

[0008] In one embodiment of this application, the hydrogen membrane purification system based on rotary valve control of the gas path further includes a heater, one end of which is connected to the interface of the membrane purifier tube 1, for heating the crude hydrogen to a first set temperature threshold.

[0009] In one embodiment of this application, the hydrogen membrane purification system based on rotary valve-controlled gas path further includes a heat exchanger. The heat exchanger is a three-channel heat exchanger, with the first channel connected to the other end of the heater, the second channel connected to the tube side 4 interface, and the third channel connected to the shell side 3 interface. It is used to exchange heat between the product hydrogen, residual tail gas, and crude hydrogen heated to a set temperature threshold, so as to improve the heat utilization efficiency.

[0010] In one embodiment of this application, when the rotary multi-way valve is in nitrogen purging state, the moving valve plate is adjusted to a 0° angle position by a servo motor, the tube side 4 interface is connected to the vent outlet, the tube side 1 and shell side 2 interfaces are connected, and the shell side 3 interface is connected to the nitrogen inlet for nitrogen purging.

[0011] In one embodiment of this application, when the rotary multi-way valve is in a vacuum state, the moving valve plate is adjusted to a -60° angle position by a servo motor, and the interface of tube side 4 and shell side 3 is connected to the vacuum port for vacuum extraction.

[0012] In one embodiment of this application, when the rotary multi-way valve is in the hydrogen purification state, the moving valve plate is adjusted to a -120° angle position by a servo motor. The pipe side 4 interface is connected to the tail gas outlet, the shell side 3 interface is connected to the product gas outlet, and the pipe side 1 interface is connected to the crude hydrogen inlet for hydrogen purification.

[0013] In one embodiment of this application, the operation of the hydrogen membrane purification system based on the rotary valve-controlled gas path is divided into four states: pressure holding test, start-up heating, hydrogen purification, and shutdown.

[0014] In one embodiment of this application, when the hydrogen membrane purification system based on the rotary valve control gas path is in the pressure holding test state, the rotary multi-way valve is in the nitrogen purging state, the needle valve during nitrogen purging is closed, and nitrogen is introduced until the pressure rises to the first preset pressure and then stops, so as to perform the pressure holding test.

[0015] When the hydrogen membrane purification system based on the rotary valve control gas path is in the start-up heating state, nitrogen gas is introduced to purge for a preset time threshold, and then the system is switched to the vacuum state. After the gas pressure on both sides of the metal membrane of the membrane purifier is drawn to the second preset pressure, the heating is started until the membrane purifier is heated to the second set temperature threshold.

[0016] When the hydrogen membrane purification system based on the rotary valve control gas path is in the hydrogen purification state, after completing the vacuuming and heating state, rotate the multi-way valve to switch to the hydrogen purification state, and introduce crude hydrogen to the third preset pressure of the tube side pressure of the membrane purifier to obtain the purified product hydrogen.

[0017] When the hydrogen membrane purification system based on the rotary valve control gas path is in the shutdown process state, the rotary multi-way valve switches from the hydrogen purification state to the nitrogen purging state. After depressurization to the standard pressure, the rotary multi-way valve switches to the vacuum state, pumps the gas pressure on both sides of the metal membrane of the membrane purifier to the third preset pressure, and then switches to the nitrogen purging state to purge nitrogen into both sides of the metal membrane for preservation and cooling.

[0018] This application proposes a hydrogen membrane purification system based on a rotary valve-controlled gas path. The system includes a membrane purifier, a rotary multi-way valve, and a servo motor. During operation, crude hydrogen is introduced into the tube side 1 interface of the membrane purifier, and product hydrogen permeates through a palladium metal membrane to the shell side 2 and shell side 3 interfaces. The residual tail gas output from the membrane purifier flows out from the other side of the tube side interface, tube side 4, and is connected to the rotary multi-way valve. The rotary multi-way valve consists of a moving valve plate and a stationary valve plate. The stationary valve plate has multiple gas paths on one side, including a product gas outlet, a tail gas outlet, an vent outlet, a vacuum port, a nitrogen inlet, and a crude hydrogen inlet gas path. The moving valve plate contains multiple independent passages. The stationary valve plate of the rotary multi-way valve connects multiple gas paths to the tube side and shell side interfaces. The servo motor controls the angle of the moving valve plate to achieve rapid switching between the membrane purifier's purging, vacuuming, and normal operation states, reducing the volume of the gas path and control equipment.

[0019] Other effects of the above-mentioned alternative methods will be described below in conjunction with specific embodiments. Attached Figure Description

[0020] Figure 1 A schematic diagram of a hydrogen membrane purification system based on a rotary valve-controlled gas path provided in an embodiment of this application;

[0021] Figure 2 An example diagram of a static valve plate provided in an embodiment of this application;

[0022] Figure 3 This is an example diagram of a movable valve plate provided in an embodiment of this application;

[0023] Figure 4This is a distribution example diagram of a rotary multi-way valve in a nitrogen purging state, provided in an embodiment of this application.

[0024] Figure 5 This is a distribution example diagram of a rotary multi-way valve in a vacuum state, provided as an embodiment of this application.

[0025] Figure 6 This is a distribution example diagram of a rotary multi-way valve in a hydrogen purification state, provided in an embodiment of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0027] The hydrogen membrane purification system based on a rotary valve-controlled gas path according to an embodiment of this application is described below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of a hydrogen membrane purification system based on a rotary valve-controlled gas path according to an embodiment of this application.

[0029] like Figure 1 As shown, the hydrogen membrane purification system based on a rotary valve-controlled gas path includes a membrane purifier 11, a rotary multi-way valve 12, and a servo motor 13, wherein:

[0030] like Figure 1 As shown, the membrane purifier 11 is divided into two parts: the tube side and the shell side. During the operation of the membrane purifier 11, crude hydrogen is introduced into the tube side 1 interface of the membrane purifier 11, and the product hydrogen permeates through the palladium metal membrane to the shell side 2 interface and the shell side 3 interface. The residual tail gas output by the membrane purifier 11 flows out from the other side of the tube side interface, the tube side 4 interface, and the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces are respectively connected to the rotary multi-way valve 12.

[0031] The rotary multi-way valve 12 consists of a moving valve plate and a stationary valve plate. One side of the stationary valve plate has multiple gas paths, including a product gas outlet, a tail gas outlet, a vent outlet, a vacuum port, a nitrogen inlet, and a crude hydrogen inlet (product gas, tail gas, vent, vacuum, nitrogen, crude hydrogen). On the other side, pipes 1, 2, 3, and 4 connect to the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces of the membrane purifier, respectively. The moving valve plate contains multiple independent passages for connecting the multiple gas paths of the stationary valve plate and pipes 1, 2, 3, and 4. Valves are installed on the pipes for the tail gas outlet, vent outlet, and vacuum port.

[0032] Optionally, such as Figure 2As shown, the rotary multi-way valve 12 has multiple gas paths on one side of the stationary valve plate, including product gas outlet, tail gas outlet, vent outlet, vacuum port, nitrogen inlet, and crude hydrogen inlet gas paths (product gas, tail gas, vent, vacuum, nitrogen, and crude hydrogen). On the other side, pipes 1, 2, 3, and 4 are respectively connected to the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces of the membrane purifier.

[0033] Optionally, such as Figure 3 As shown, the moving valve plate contains multiple independent passages (passages 1, 2, 3, 4), which are used to connect multiple air passages of the stationary valve plate as well as pipes 1, 2, 3, and 4.

[0034] The servo motor 13 is connected to the valve plate of the rotary multi-way valve 12 and is used to control the rotation of the moving valve plate to connect the target outlet gas path and the target pipe side and / or target shell side interface required in the stationary valve plate.

[0035] In some embodiments, such as Figure 1 As shown, the hydrogen membrane purification system based on rotary valve control gas path also includes a heater 14, one end of which is connected to the interface of the membrane purifier 11 tube side 1, for heating crude hydrogen to a first set temperature threshold.

[0036] The first set temperature threshold can be 400℃, but is not limited to this.

[0037] In some embodiments, such as Figure 1 As shown, the hydrogen membrane purification system based on rotary valve control of the gas path also includes a heat exchanger 15. The heat exchanger 15 is a three-channel heat exchanger. The first channel is connected to the other end of the heater 14, the second channel is connected to the tube side 4 interface, and the third channel is connected to the shell side 3 interface. It is used to exchange heat between the product hydrogen, residual tail gas and crude hydrogen heated to a set temperature threshold to improve the heat utilization efficiency.

[0038] In some embodiments, such as Figure 4 As shown, when the rotary multi-way valve 12 is in nitrogen purging state, the moving valve plate is adjusted to a 0° angle position by the servo motor 13, the tube side 4 interface is connected to the vent outlet, the tube side 1 and shell side 2 interfaces are connected, and the shell side 3 interface is connected to the nitrogen inlet to perform nitrogen purging.

[0039] Furthermore, such as Figure 5 As shown, when the rotary multi-way valve 12 is in a vacuum state, the moving valve plate is adjusted to a -60° angle position by the servo motor 13, and the tube side 4 and shell side 3 interfaces are connected to the vacuum port for vacuum extraction.

[0040] Furthermore, such as Figure 6As shown, when the rotary multi-way valve 12 is in the hydrogen purification state, the moving valve plate is adjusted to a -120° angle position by the servo motor 13. The pipe side 4 interface is connected to the tail gas outlet, the shell side 3 interface is connected to the product gas outlet, and the pipe side 1 interface is connected to the crude hydrogen inlet for hydrogen purification.

[0041] In addition, the operation of the hydrogen membrane purification system based on the rotary valve control gas path is divided into four states: pressure holding test, start heating, hydrogen purification, and shutdown.

[0042] Furthermore, when the hydrogen membrane purification system based on the rotary valve control gas path is in the pressure holding test state, the rotary multi-way valve 12 is in the nitrogen purging state, the needle valve during nitrogen purging is closed, and nitrogen is introduced until the pressure rises to the first preset pressure and then stops, so as to carry out the pressure holding test.

[0043] The first preset pressure can be 0.7 MPa, but is not limited to this.

[0044] When the hydrogen membrane purification system based on the rotary valve control gas path is in the start-up heating state, nitrogen gas is introduced to purge for a preset time threshold, and then the system is switched to the vacuum state. After the gas pressure on both sides of the metal membrane of the membrane purifier 11 is evacuated to the second preset pressure, the heating is started until the membrane purifier 11 is heated to the second set temperature threshold.

[0045] The preset time threshold can be 10 minutes, the second preset pressure can be -80 kPa, and the second preset temperature threshold can be 400℃, but it is not limited to these.

[0046] When the hydrogen membrane purification system based on the rotary valve control gas path is in the hydrogen purification state, after completing the vacuuming and heating state, the multi-way valve 12 is rotated to switch to the hydrogen purification state, and crude hydrogen is introduced into the third preset pressure of the tube side of the membrane purifier 11 to obtain the purified product hydrogen.

[0047] The third preset pressure can be 1.6 MPa, but is not limited to this.

[0048] When the hydrogen membrane purification system based on the rotary valve control gas path is in the shutdown process state, the rotary multi-way valve 12 switches from the hydrogen purification state to the nitrogen purging state. After depressurization to the standard pressure, the rotary multi-way valve 12 switches to the vacuum state, pumps the gas pressure on both sides of the metal membrane of the membrane purifier 11 to the third preset pressure, and then switches to the nitrogen purging state to purge nitrogen into both sides of the metal membrane for preservation and cooling.

[0049] Furthermore, this application also proposes a connection table for the interface of the rotary multi-way valve 12 in the nitrogen purging state, vacuum state, and hydrogen purification state, and the pipelines (pipeline 1, pipeline 2, pipeline 3, and pipeline 4) on the other side of the stationary valve plate of the rotary multi-way valve 12, as shown in Table 1:

[0050] Table 1. Connection Relationships Between Interfaces and Pipelines

[0051]

[0052] This application proposes a hydrogen membrane purification system based on a rotary valve-controlled gas path. The system includes a membrane purifier, a rotary multi-way valve, and a servo motor. During operation, crude hydrogen is introduced into the tube side 1 interface of the membrane purifier, and product hydrogen permeates through a palladium metal membrane to the shell side 2 and shell side 3 interfaces. The residual tail gas output from the membrane purifier flows out from the other side of the tube side interface, tube side 4, and is connected to the rotary multi-way valve. The rotary multi-way valve consists of a moving valve plate and a stationary valve plate. The stationary valve plate has multiple gas paths on one side, including a product gas outlet, a tail gas outlet, an vent outlet, a vacuum port, a nitrogen inlet, and a crude hydrogen inlet gas path. The moving valve plate contains multiple independent passages. The stationary valve plate of the rotary multi-way valve connects multiple gas paths to the tube side and shell side interfaces. The servo motor controls the angle of the moving valve plate to achieve rapid switching between the membrane purifier's purging, vacuuming, and normal operation states, reducing the volume of the gas path and control equipment.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydrogen membrane purification system based on a rotary valve-controlled gas path, characterized in that, The hydrogen membrane purification system based on a rotary valve-controlled gas path includes a membrane purifier, a rotary multi-way valve, and a servo motor, wherein: The membrane purifier is divided into two parts: the tube side and the shell side. During the operation of the membrane purifier, crude hydrogen is introduced into the tube side 1 interface of the membrane purifier, and the product hydrogen permeates through the palladium metal membrane to the shell side 2 interface and the shell side 3 interface. The residual tail gas output by the membrane purifier flows out from the other side interface of the tube side, tube side 4, and the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces are respectively connected to rotary multi-way valves. The rotary multi-way valve plate consists of a moving valve plate and a stationary valve plate. The stationary valve plate has multiple gas passages on one side, including a product gas outlet, a tail gas outlet, an vent outlet, a vacuum port, a nitrogen inlet, and a crude hydrogen inlet gas passage. On the other side, pipes 1, 2, 3, and 4 are respectively connected to the tube side 1, tube side 4, shell side 2, and shell side 3 interfaces of the membrane purifier. The moving valve plate contains multiple independent passages for connecting the multiple gas passages of the stationary valve plate and pipes 1, 2, 3, and 4. The servo motor is connected to the rotary multi-way valve plate and is used to control the rotation of the moving valve plate to connect the target outlet gas path and the target pipe side and / or target shell side interface required in the stationary valve plate.

2. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 1, characterized in that, The hydrogen membrane purification system based on rotary valve control of the gas path also includes a heater, one end of which is connected to the interface of the membrane purifier tube 1, for heating the crude hydrogen to a first set temperature threshold.

3. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 2, characterized in that, The hydrogen membrane purification system based on rotary valve-controlled gas path also includes a heat exchanger. The heat exchanger is a three-channel heat exchanger. The first channel is connected to the other end of the heater, the second channel is connected to the tube side 4 interface, and the third channel is connected to the shell side 3 interface. It is used to exchange heat between the product hydrogen, residual tail gas and crude hydrogen heated to a set temperature threshold to improve heat utilization efficiency.

4. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 1, characterized in that, When the rotary multi-way valve is in nitrogen purging mode, the moving valve plate is adjusted to a 0° angle position by a servo motor. The tube side 4 interface is connected to the vent outlet, the tube side 1 and shell side 2 interfaces are connected, and the shell side 3 interface is connected to the nitrogen inlet for nitrogen purging.

5. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 1, characterized in that, When the rotary multi-way valve is in a vacuum state, the moving valve plate is adjusted to a -60° angle position by a servo motor, and the interface of tube side 4 and shell side 3 is connected to the vacuum port for vacuum extraction.

6. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 1, characterized in that, When the rotary multi-way valve is in the hydrogen purification state, the moving valve plate is adjusted to a -120° angle position by a servo motor. The pipe side 4 interface is connected to the tail gas outlet, the shell side 3 interface is connected to the product gas outlet, and the pipe side 1 interface is connected to the crude hydrogen inlet for hydrogen purification.

7. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 1, characterized in that, The operation of the hydrogen membrane purification system based on the rotary valve-controlled gas path is divided into four states: pressure holding test, start-up heating, hydrogen purification, and shutdown.

8. The hydrogen membrane purification system based on a rotary valve-controlled gas path as described in claim 7, characterized in that, When the hydrogen membrane purification system based on the rotary valve control gas path is in the pressure holding test state, the rotary multi-way valve is in the nitrogen purging state, the needle valve during nitrogen purging is closed, and nitrogen is introduced until the pressure rises to the first preset pressure and then stops, so as to carry out the pressure holding test. When the hydrogen membrane purification system based on the rotary valve control gas path is in the start-up heating state, nitrogen gas is introduced to purge for a preset time threshold, and then the system is switched to the vacuum state. After the gas pressure on both sides of the metal membrane of the membrane purifier is drawn to the second preset pressure, the heating is started until the membrane purifier is heated to the second set temperature threshold. When the hydrogen membrane purification system based on the rotary valve control gas path is in the hydrogen purification state, after completing the vacuuming and heating state, rotate the multi-way valve to switch to the hydrogen purification state, and introduce crude hydrogen to the third preset pressure of the tube side pressure of the membrane purifier to obtain the purified product hydrogen. When the hydrogen membrane purification system based on the rotary valve control gas path is in the shutdown process state, the rotary multi-way valve switches from the hydrogen purification state to the nitrogen purging state. After depressurization to the standard pressure, the rotary multi-way valve switches to the vacuum state, pumps the gas pressure on both sides of the metal membrane of the membrane purifier to the third preset pressure, and then switches to the nitrogen purging state to purge nitrogen into both sides of the metal membrane for preservation and cooling.

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