Many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation and control method

Abstract

The invention discloses a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation and a control method, the many-to-one water electrolysis hydrogen production device comprises a hydrogen production device separation system and a control system, the hydrogen production device separation system comprises a main working electrolytic cell, a standby electrolytic cell and a hydrogen side gas-liquid separator alkali liquor feeding pipeline; an alkali liquor flow meter, an alkali liquor flow regulating valve and a feeding mixer are sequentially arranged along the flowing direction of alkali liquor, the alkali liquor of the pipeline flows from the electrolytic tanks to the hydrogen side gas-liquid separator, the plurality of main working electrolytic tanks are arranged, and the discharge port pipeline of each main working electrolytic tank is divided into two pipelines. The control system comprises a control cabinet and an upper computer, a control program is stored in the control cabinet, electric signals of the hydrogen purity detection device and the alkali liquor flow meter can be received, and the working state of the alkali liquor flow adjusting valve is adjusted according to the signals.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen energy technology, and in particular to a many-to-one water electrolysis hydrogen production device and a control method based on hydrogen purity calculation. Background Art

[0002] As a zero-carbon, green, and renewable energy source, hydrogen energy has the advantages of high energy density and high conversion efficiency, and can achieve zero emissions and zero pollution from development to utilization. The preparation of hydrogen is an important link in the hydrogen energy industry chain. Existing hydrogen production technologies mainly include hydrogen production from fossil fuels and chemical by-products, hydrogen production from biomass, and hydrogen production from water electrolysis. Water electrolysis hydrogen production technology, as a clean and sustainable hydrogen production method, has received widespread attention in recent years. Through the process of water electrolysis, water is decomposed into hydrogen and oxygen, among which hydrogen, as an important energy carrier, has important application prospects. The efficiency and stability of water electrolysis hydrogen production devices have always been the focus of related technical research. Especially when multiple-to-one water electrolysis hydrogen production devices are operated in conjunction, how to ensure the high purity of hydrogen and the coordination between the various devices has become a technical problem that needs to be solved urgently.

[0003] At present, the common multi-to-one water electrolysis hydrogen production device usually includes multiple electrolyzers corresponding to a set of separation systems and a set of purification systems, and multiple electrolyzers are connected to a set of gas-liquid separators. After each electrolyzer produces hydrogen individually, it is processed by the gas-liquid separator to separate the hydrogen from oxygen and water. Due to the differences in the individual electrolyzers, working conditions, loads and electrolyte states, there are large differences in the purity of the hydrogen produced by different electrolyzers. In addition, the gas-liquid separation system of the traditional one-to-one water electrolysis hydrogen production device is mostly operated for a single electrolyzer, and it is difficult to operate in a coordinated manner when multiple electrolyzers work together in the multi-to-one water electrolysis hydrogen production device. The fluctuation of gas purity often cannot be adjusted in real time, resulting in instability of hydrogen purity, affecting the efficiency of hydrogen use, and thus causing huge waste of hydrogen.

[0004] In addition, in the prior art, in the many-to-one system, there is usually a problem of difficulty in regulating the purity of hydrogen gas. In order to stabilize the purity of hydrogen, the traditional system will detect and control by manually adjusting valves, flow meters and other equipment. However, this control method is not only slow to respond, but also easily affected by changes in the external environment (such as temperature and pressure changes in the electrolyzer), making it difficult for the system to accurately adjust the purity of hydrogen. In severe cases, it may cause waste of hydrogen or unstable operation of the equipment. Therefore, there is an urgent need for a many-to-one water electrolysis hydrogen production device and control method based on hydrogen purity calculation to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a many-to-one water electrolysis hydrogen production device and a control method based on hydrogen purity calculation to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation, including a hydrogen production device separation system and a control system, the hydrogen production device separation system including a main working electrolytic cell, a spare electrolytic cell and a hydrogen side gas-liquid separator alkali liquid feed pipeline, along the alkali liquid flow direction, an alkali liquid flow meter, an alkali liquid flow regulating valve, and a feed mixer are sequentially provided, wherein the alkali liquid flow direction of the pipeline is from the electrolytic cell to the hydrogen side gas-liquid separator, the main working electrolytic cell is provided with multiple, the main working electrolytic cell discharge port pipeline is divided into two pipelines, the spare electrolytic cell discharge port pipeline is a single pipeline, and the discharge ports of every two electrolytic cells in the main working electrolytic cell are connected in parallel to the alkali liquid flow regulating valve and the feed mixer in sequence through pipelines, and are connected to a hydrogen side main working gas-liquid separator;

[0007] The control system is respectively connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device to collect electrical signals from the hydrogen purity detection device and the alkali liquid flow meter, and control the working state of the alkali liquid flow regulating valve according to the electrical signals and control instructions.

[0008] Preferably, the separation system of the hydrogen production device further includes an electrolyzer, an electrolyzer alkali liquid feed pipeline, a hydrogen side gas-liquid separator, a feed mixer, a hydrogen delivery pipeline and a purification device, the electrolyzer has an alkali liquid feed port and two discharge ports, the discharge port is located on the cathode side of the electrolyzer, and the discharge ports are respectively connected to the alkali liquid feed pipeline of the hydrogen side gas-liquid separator;

[0009] The electrolytic cell alkali liquid feed pipeline is provided with a feed mixing diverter, an alkali liquid flow meter and an alkali liquid flow regulating valve in sequence along the alkali liquid flow direction, wherein the alkali liquid flow direction of the pipeline is from the alkali liquid reflux outlet of the hydrogen side gas-liquid separator to the electrolytic cell feed port;

[0010] The hydrogen side gas-liquid separator is connected to the other end of the alkali liquid feed pipeline of the hydrogen side gas-liquid separator. The hydrogen side gas-liquid separator is divided into two categories, one is the main working gas-liquid separator, and the other is the gas-liquid separator for adjusting the hydrogen purity. Each hydrogen side gas-liquid separator is provided with a hydrogen purity detection device. The feed port of the hydrogen side gas-liquid separator is connected to the discharge port of the electrolyzer through the alkali liquid feed pipeline of the hydrogen side gas-liquid separator. The alkali liquid reflux outlet of the gas-liquid separator is connected to the feed port of the electrolyzer through the alkali liquid feed pipeline of the water electrolysis hydrogen production device. The gas phase outlet of the gas-liquid separator is connected to the feed port of the purification device through the hydrogen transmission pipeline.

[0011] The feed mixer has multiple input ends and one output end, and the input ends are respectively connected to the corresponding electrolytic cell discharge ports. The feed mixing diverter has multiple input ends and multiple output ends, and the input ends are respectively connected to the alkali liquid reflux outlet of the gas-liquid separator.

[0012] The hydrogen transmission pipeline is provided with a hydrogen flow meter and a hydrogen flow regulating valve in sequence along the hydrogen transmission direction. The hydrogen flow direction of the pipeline is from the gas-liquid separator to the purification device. The purification device is provided with a hydrogen feed inlet, a hydrogen product outlet, and an impurity flow outlet.

[0013] Preferably, the control system includes a control cabinet, in which a control program is stored, and the control cabinet is electrically connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device respectively;

[0014] The host computer is electrically connected to the control cabinet via wires, and the host computer has a display screen for displaying electrical signals and a functional module for collecting control instructions.

[0015] Preferably, the functional module for collecting control instructions is integrated into the display screen.

[0016] The control method of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation is as follows:

[0017] S1. Adjust the working mode of the hydrogen purity detection device and the alkali liquid flow control valve to the automatic mode, set the stable range value of hydrogen purity for a multiple-to-one water electrolysis hydrogen production device separation system based on hydrogen purity calculation, set the stable diversion value of the alkali liquid flow for a multiple-to-one water electrolysis hydrogen production device separation system based on hydrogen purity calculation, and use the control system to control the working state of each component of the main working electrolyzer, so that the alkali liquid, under the action of the alkali liquid flow control valve, alternately circulates or bidirectionally between the hydrogen purity regulating gas-liquid separator and the main working gas-liquid separator corresponding to the main working electrolyzer;

[0018] S2. Using a hydrogen purity detection device to collect the actual value of hydrogen purity in the gas after separation by the gas-liquid separator in real time, and using the control system working state to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve;

[0019] S3. Using the alkali liquid flow meter to collect the actual flow value of the alkali liquid in the alkali liquid feed control main line of the gas-liquid separator in real time, and using the working state of the control system to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve;

[0020] S4. Based on the fact that the difference between the set stable range value of hydrogen purity and the actual value of hydrogen purity is greater than a preset threshold, the control system automatically adjusts the working parameters of the alkali liquid flow control valve so that the difference between the stable steering diversion value and the actual flow value is no greater than the preset value.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The control system of the present invention includes a control cabinet and a host computer. The control cabinet stores a control program inside, can receive electrical signals from the hydrogen purity detection device and the alkali liquid flow meter, and adjust the working state of the alkali liquid flow regulating valve according to these signals. The host computer is electrically connected to the control cabinet, displays the electrical signals through a display screen, and can collect control instructions to perform corresponding operations. The design of this system has a high level of automation and intelligence, and can adjust the working mode of each component according to the real-time operating status of the system, ensuring the stability and efficiency of the hydrogen production process.

[0023] The technical solution of the present invention has significant advantages over the traditional many-to-one water electrolysis hydrogen production device and control method. First, the design of the system fully considers the balance between hydrogen purity and hydrogen generation efficiency. Through precise control of the gas-liquid separator and the flow control valve, the phenomenon of hydrogen waste is effectively avoided. Secondly, through real-time detection and adjustment of hydrogen purity, the system can maintain stable hydrogen purity under different working conditions, avoiding the common hydrogen purity fluctuation problem in traditional devices and improving the working stability of the entire device. In addition, the control method of the present invention reduces manual intervention through an automated adjustment mechanism, thereby improving the operating efficiency and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural block diagram of the hydrogen side separation system of a traditional many-to-one water electrolysis hydrogen production device;

[0025] Figure 2 This is a structural block diagram of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0026] Figure 3 This is a block diagram of the control system of the alkali liquid flow regulating valve of the present invention;

[0027] Figure 4 This is a state block diagram of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0028] Figure 5 This is a first state block diagram of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0029] Figure 6 This is a block diagram of the second state of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0030] Figure 7 This is a block diagram of the third state of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0031] Figure 8 This is a fourth state block diagram of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention;

[0032] Figure 9 This is a fifth state block diagram of a hydrogen side separation system of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to an embodiment of the present invention.

[0033] In the picture:

[0034] Electrolytic cell number: electrolytic cell (electrolytic cell number);

[0035] Alkali liquid flow meter label of alkali liquid feed pipeline of hydrogen side gas-liquid separator: f-(tank number)-(left 1 / right 2);

[0036] Alkali flow meter label of the feed pipeline of the purification device: fC-(separator number);

[0037] Alkali flow meter label of electrolytic cell feed pipeline: fA-(separator number);

[0038] Alkali solution flow regulating valve label: A-(tank number)-F-(separator number);

[0039] Main working gas-liquid separator number: main working gas-liquid separator (the number of the gas-liquid separator);

[0040] Gas-liquid separator for regulating hydrogen purity Label: Gas-liquid separator for regulating hydrogen purity. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1

[0043] See attached Figure 1As shown, the structure of the hydrogen side separation system of the traditional many-to-one water electrolysis hydrogen production device includes a separation system and a purification system corresponding to 2N electrolyzers. The 2N electrolyzers are connected to a gas-liquid separator. After each electrolyzer produces hydrogen individually, the hydrogen is separated from oxygen and water through processing by the gas-liquid separator. Due to the differences in individual electrolyzers, working conditions, loads and electrolyte states, the purity of the hydrogen produced by different electrolyzers varies greatly. In addition, the gas-liquid separation system of the traditional one-to-one water electrolysis hydrogen production device is mostly operated for a single electrolyzer, and it is difficult to operate in a coordinated manner when multiple electrolyzers work together in the many-to-one water electrolysis hydrogen production device. Fluctuations in gas purity often cannot be adjusted in real time, resulting in unstable hydrogen purity.

[0044] See attached Figure 2 As shown, the present invention provides a many-to-one water electrolysis hydrogen production device separation system and control method based on hydrogen purity calculation, including: 2N electrolytic cells, N+1 gas-liquid separators, a hydrogen purity detection device, 1 purification device, an alkali liquid feed pipeline, and an alkali liquid flow meter and an alkali liquid flow regulating valve are sequentially provided along the alkali liquid flow direction; a gas feed pipeline, and an alkali liquid flow meter and an alkali liquid flow regulating valve are sequentially provided along the gas flow direction.

[0045] For details, see the attached Figure 2 As shown, the alkali liquid feed pipeline of the hydrogen side gas-liquid separator of the separation system is sequentially provided with an alkali liquid flow meter, an alkali liquid flow regulating valve, and a feed mixer along the alkali liquid flow direction. The alkali liquid in the pipeline flows from the electrolytic cell to the hydrogen side gas-liquid separator. The discharge port pipeline of the main working electrolytic cell is divided into two pipelines, and the discharge port pipeline of the standby electrolytic cell is a single pipeline.

[0046] For details, see the attached Figure 2 As shown, the discharge ports of every two electrolytic cells in the main working electrolytic cells are connected in parallel with the alkali liquid flow regulating valve and the feed mixer in sequence through pipelines, and finally connected to a main working gas-liquid separator on the hydrogen side.

[0047] For details, see the attached Figure 3 As shown, the control system block diagram is connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device respectively so as to collect the electrical signals of the hydrogen purity detection device and the alkali liquid flow meter and control the working state of the alkali liquid flow regulating valve according to the electrical signals and control instructions.

[0048] Further, among others, see Attachment Figure 2 The separation systems of the hydrogen production units shown include:

[0049] For details, see the attached Figure 2As shown, the electrolytic cell has an alkali liquid feed port and two discharge ports. The discharge port refers to the discharge port on the cathode side of the electrolytic cell. The discharge ports are respectively connected to the alkali liquid feed pipeline of the hydrogen side gas-liquid separator to discharge the hydrogen liquid in the electrolytic cell.

[0050] For details, see the attached Figure 2 As shown, the electrolytic cell alkali liquid feed pipeline is provided with a feed mixing diverter, an alkali liquid flow meter and an alkali liquid flow regulating valve in sequence along the alkali liquid flow direction, wherein the alkali liquid flow direction of the pipeline is from the alkali liquid reflux outlet of the hydrogen side gas-liquid separator to the electrolytic cell feed port;

[0051] For details, see the attached Figure 2 As shown, the number of electrolytic cells is 2N+1, of which 2N electrolytic cells are main working electrolytic cells, and the single electrolytic cell that is not paired is a spare electrolytic cell;

[0052] For details, see the attached Figure 2 As shown, the hydrogen side gas-liquid separator is connected to the other end of the alkali liquid feed pipeline of the hydrogen side gas-liquid separator to separate the hydrogen and alkali liquid in the gas-liquid mixture in the pipeline;

[0053] For details, see the attached Figure 2 As shown, the hydrogen side gas-liquid separators are divided into two categories, one is the main working gas-liquid separator, and the other is the gas-liquid separator for adjusting the hydrogen purity.

[0054] For details, see the attached Figure 2 As shown, each hydrogen side gas-liquid separator is provided with a hydrogen purity detection device, the feed port of the hydrogen side gas-liquid separator is connected to the discharge port of the electrolyzer through the alkali liquid feed pipeline of the hydrogen side gas-liquid separator, the alkali liquid reflux outlet of the gas-liquid separator is connected to the feed port of the electrolyzer through the alkali liquid feed pipeline of the water electrolysis hydrogen production device, and the gas phase outlet of the gas-liquid separator is connected to the feed port of the purification device through the hydrogen transmission pipeline.

[0055] For details, see the attached Figure 2 As shown, the number of hydrogen side gas-liquid separators is N+1, of which N hydrogen side gas-liquid separators are main working gas-liquid separators, and 1 hydrogen side gas-liquid separator is a gas-liquid separator for adjusting hydrogen purity.

[0056] For details, see the attached Figure 2 As shown, the feed mixer has two or more input ends and one output end. The two or more input ends are respectively connected to the discharge port of the electrolytic cell and are evenly mixed to send the gas-liquid mixture flowing into it through the output end into the corresponding gas-liquid separator.

[0057] For details, see the attached Figure 2As shown, the feed mixing diverter has two or more input ends and two or more output ends. The two or more input ends are respectively connected to the alkali liquor reflux outlet of the gas-liquid separator and are evenly mixed, and the mixed reflux alkali liquor is fed into the feed port of the electrolytic cell according to a certain flow ratio.

[0058] For details, see the attached Figure 2 As shown, the hydrogen delivery pipeline is sequentially provided with a hydrogen flow meter and a hydrogen flow regulating valve along the hydrogen delivery direction; wherein the hydrogen flow direction of the pipeline is from the gas-liquid separator to the purification device.

[0059] For details, see the attached Figure 2 As shown, the purification device in the multiple-to-one water electrolysis hydrogen production device removes oxygen, water vapor and other impurity gases in the hydrogen to ensure that the purity of the hydrogen meets the application requirements.

[0060] For details, see the attached Figure 2 As shown, the purification device is provided with a hydrogen feed inlet, a hydrogen product outlet, and an impurity outlet.

[0061] Furthermore, the control system includes:

[0062] For details, see the attached Figure 4 As shown, the control module stores a control program internally, and the control cabinet is connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device respectively;

[0063] Furthermore, each main working gas-liquid separator in the system is connected to two electrolyzers, while the gas-liquid separator for hydrogen purity control is connected to all electrolyzers. The alkali liquid feed pipeline is equipped with a alkali liquid flow meter and a alkali liquid flow control valve. The entire system achieves precise control of the flow control valve to adjust hydrogen purity and optimize the hydrogen generation process.

[0064] Example 2

[0065] Based on Example 1, the present invention provides a control method, see the attached Figure 2 and attached Figure 3 , using any one of the many-to-one water electrolysis hydrogen production device alkali solution flow control systems in Example 1 to perform the following steps:

[0066] S1. Adjust the working mode of the hydrogen purity detection device, alkali liquid flow meter, and alkali liquid flow control valve to automatic mode;

[0067] S2. Setting a stable range value of hydrogen purity for the separation system of the many-to-one water electrolysis hydrogen production device;

[0068] S3, setting a stable diversion value of the alkali solution flow for the separation system of the multiple-to-one water electrolysis hydrogen production device;

[0069] S4. Using a control system to control the working state of each component, so that the alkali solution, under the action of the alkali solution flow control valve, circulates alternately or bidirectionally between the hydrogen purity regulating gas-liquid separator and the main working gas-liquid separator corresponding to the main working electrolyzer;

[0070] S5. Using a hydrogen purity detection device to collect the actual value of hydrogen purity in the gas after separation by the gas-liquid separator in real time, and using the control system working state to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve;

[0071] S6. Using the alkali liquid flow meter to collect the actual flow value of the alkali liquid in the alkali liquid feed control main line of the gas-liquid separator in real time, and using the working state of the control system to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve;

[0072] S7. Based on the fact that the difference between the set stable range value of hydrogen purity and the actual value of hydrogen purity is greater than a preset threshold, the control system automatically adjusts the working parameters of the alkali liquid flow control valve so that the difference between the stable steering diversion value and the actual flow value is no greater than the preset value.

[0073] It's important to note that the stable hydrogen purity range specified in this invention requires a hydrogen mole fraction greater than or equal to 99% in the separated gas. Only when this condition is met can the separated hydrogen be transported to the purification unit for subsequent processing. This requirement ensures that the purified hydrogen meets the stringent purity standards required for various applications.

[0074] Example 3

[0075] Based on Example 1 and Example 2, the present invention is further introduced and described below through a specific embodiment. Figure 4 To the attached Figure 9 :

[0076] For details, see the attached Figure 4 As shown, electrolyzer A and electrolyzer B are two main working electrolyzers, and electrolyzer X is a spare electrolyzer. One direction of the discharge ports of electrolyzer A and electrolyzer B is connected to the same main working gas-liquid separator through their respective alkali solution feed pipelines; the other direction of the discharge ports of electrolyzer A and electrolyzer B is connected to the gas-liquid separator for regulating hydrogen purity through their respective alkali solution feed pipelines; the discharge port of electrolyzer X is connected to the gas-liquid separator for regulating hydrogen purity in only one direction through the alkali solution feed pipeline.

[0077] For details, see the attached Figure 4 As shown, the three alkali liquid feed pipelines are all provided with alkali liquid flow meters and alkali liquid flow regulating valves along the alkali liquid flow direction; and the two gas-liquid separators are both provided with hydrogen purity detection devices.

[0078] Furthermore, the hydrogen purity detection device collects the actual value of the hydrogen purity in the gas after separation by the gas-liquid separator in real time, and uses the control system to control the valve switching action to complete the diversion of the alkali liquid under the action of the alkali liquid flow control valve; the alkali liquid flow meter collects the actual flow value of the alkali liquid in the alkali liquid feed control main line of the gas-liquid separator in real time, and uses the alkali liquid flow PI adjustment method of the control system to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve;

[0079] The gas-liquid separation system of the many-to-one water electrolysis hydrogen production device with hydrogen purity adjustment capability provided by the present invention is not in operation (state 1), see the attached Figure 5 As shown, all electrolytic cells, alkali liquid flow meters, alkali liquid flow valves, hydrogen purity detection devices, main working gas-liquid separators, and hydrogen purity control gas-liquid separators in the system are in a closed state.

[0080] When the gas-liquid separation system of the multi-to-one water electrolysis hydrogen production device with hydrogen purity adjustment capability provided by the present invention starts to operate (state 2), see the attached Figure 6 As shown, in the system, electrolyzer A and electrolyzer B are started simultaneously, and electrolyzer X is in the closed state; the four alkali liquid flow meters connected to the bidirectional alkali liquid feed pipeline connected to electrolyzer A and electrolyzer B, the main working gas-liquid separator, the hydrogen purity control gas-liquid separator, and the two hydrogen purity detection devices are turned on simultaneously.

[0081] The alkali liquid flow valve connected to electrolyzer A that flows to the main working gas-liquid separator is in the open state, and the alkali liquid flow valve connected to electrolyzer A that flows to the hydrogen purity gas-liquid separator is in the closed state; the alkali liquid flow valve connected to electrolyzer B that flows to the main working gas-liquid separator is in the closed state, and the alkali liquid flow valve connected to electrolyzer B that flows to the hydrogen purity gas-liquid separator is in the open state;

[0082] That is, the main working gas-liquid separator is responsible for gas-liquid separation of the hydrogen produced by electrolyzer A, while the hydrogen purity control gas-liquid separator is responsible for gas-liquid separation of the hydrogen produced by electrolyzer B. When the hydrogen purity detection device detects that the hydrogen purity in the gas-liquid separator is ≥99%, the valve on the hydrogen feed line from this separator to the purification unit opens.

[0083] The present invention provides a multi-to-one water electrolysis hydrogen production device with hydrogen purity adjustment capability. The gas-liquid separation system device is in the next operating stage (state three), see the attached Figure 7 As shown, when the hydrogen purity detection device detects that the hydrogen purity in the main working gas-liquid separator and the hydrogen purity control gas-liquid separator is ≥99%, the valves of the hydrogen feed pipelines from the two separators to the purification device are both in the open state.

[0084] At the same time, the alkaline liquid flow valve connected to electrolyzer B that flows to the main working gas-liquid separator is set from the closed state to the open state, that is, the gas-liquid separation work of the hydrogen produced by electrolyzer A is undertaken by the main working gas-liquid separator, and the gas-liquid separation work of the hydrogen produced by electrolyzer B is undertaken jointly by the main working gas-liquid separator and the gas-liquid separator for controlling the hydrogen purity.

[0085] The alkali liquid flowmeter collects the actual flow value of the alkali liquid in the alkali liquid feed pipeline from electrolytic cell B to the main working gas-liquid separator in real time, compares the collected actual flow value with the preset flow value, and generates an instruction value by the PI control unit to control the flow regulating valve of the alkali liquid feed pipeline from electrolytic cell B to the main working gas-liquid separator and the hydrogen purity gas-liquid separator.

[0086] The present invention provides a multi-to-one water electrolysis hydrogen production device with hydrogen purity adjustment capability. The gas-liquid separation system device is in the next operating stage (state 4), see the attached Figure 8 As shown in the figure, when the flow control valve on the hydrogen purity control gas-liquid separator side of electrolyzer B is controlled to the closed state, the alkaline liquid flowing out of the discharge port of electrolyzer B will all flow to the main working gas-liquid separator. In other words, the gas-liquid separation work of the hydrogen produced by electrolyzers A and B is undertaken by the main working gas-liquid separator.

[0087] The present invention provides a multi-to-one water electrolysis hydrogen production device with hydrogen purity adjustment capability. The gas-liquid separation system device is in full operation stage (state five), see the attached Figure 9 As shown, open the electrolytic cell X, open the flow regulating valve of the alkali liquid feed pipeline connected to the hydrogen purity regulating gas-liquid separator, and connect the purification device when the hydrogen purity in the hydrogen purity regulating gas-liquid separator is ≥99%.

[0088] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation, characterized by: It includes a hydrogen production device separation system and a control system. The hydrogen production device separation system includes a main working electrolyzer, a spare electrolyzer and an alkali liquid feed pipeline of a hydrogen side gas-liquid separator. An alkali liquid flow meter, an alkali liquid flow regulating valve and a feed mixer are sequentially provided along the alkali liquid flow direction. The alkali liquid in the pipeline flows from the electrolyzer to the hydrogen side gas-liquid separator. There are multiple main working electrolyzers. The main working electrolyzer outlet pipeline is divided into two pipelines. The spare electrolyzer outlet pipeline is a single pipeline. The outlets of every two electrolyzers in the main working electrolyzer are connected in parallel with the alkali liquid flow regulating valve and the feed mixer in sequence through pipelines, and are connected to a main working gas-liquid separator on the hydrogen side. The control system is respectively connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device to collect electrical signals from the hydrogen purity detection device and the alkali liquid flow meter, and control the working state of the alkali liquid flow regulating valve according to the electrical signals and control instructions.

2. The many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to claim 1, characterized in that: The separation system of the hydrogen production device also includes an electrolyzer, an electrolyzer alkali liquid feed pipeline, a hydrogen side gas-liquid separator, a feed mixer, a hydrogen delivery pipeline and a purification device. The electrolyzer has an alkali liquid feed port and two discharge ports. The discharge ports are located on the cathode side of the electrolyzer and are respectively connected to the alkali liquid feed pipeline of the hydrogen side gas-liquid separator. The electrolytic cell alkali liquid feed pipeline is provided with a feed mixing diverter, an alkali liquid flow meter and an alkali liquid flow regulating valve in sequence along the alkali liquid flow direction, wherein the alkali liquid flow direction of the pipeline is from the alkali liquid reflux outlet of the hydrogen side gas-liquid separator to the electrolytic cell feed port; The hydrogen side gas-liquid separator is connected to the other end of the alkali liquid feed pipeline of the hydrogen side gas-liquid separator. The hydrogen side gas-liquid separator is divided into two categories, one is the main working gas-liquid separator, and the other is the gas-liquid separator for adjusting the hydrogen purity. Each hydrogen side gas-liquid separator is provided with a hydrogen purity detection device. The feed port of the hydrogen side gas-liquid separator is connected to the discharge port of the electrolyzer through the alkali liquid feed pipeline of the hydrogen side gas-liquid separator. The alkali liquid reflux outlet of the gas-liquid separator is connected to the feed port of the electrolyzer through the alkali liquid feed pipeline of the water electrolysis hydrogen production device. The gas phase outlet of the gas-liquid separator is connected to the feed port of the purification device through the hydrogen transmission pipeline. The feed mixer has multiple input ends and one output end, and the input ends are respectively connected to the corresponding electrolytic cell discharge ports. The feed mixing diverter has multiple input ends and multiple output ends, and the input ends are respectively connected to the alkali liquid reflux outlet of the gas-liquid separator. The hydrogen transmission pipeline is provided with a hydrogen flow meter and a hydrogen flow regulating valve in sequence along the hydrogen transmission direction. The hydrogen flow direction of the pipeline is from the gas-liquid separator to the purification device. The purification device is provided with a hydrogen feed inlet, a hydrogen product outlet, and an impurity flow outlet.

3. The many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to claim 1, characterized in that: The control system includes a control cabinet, which stores a control program. The control cabinet is electrically connected to the alkali liquid flow meter, the alkali liquid flow regulating valve and each hydrogen purity detection device through wires. The host computer is electrically connected to the control cabinet via wires, and the host computer has a display screen for displaying electrical signals and a functional module for collecting control instructions.

4. The many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to claim 3, characterized in that: The function module for collecting control instructions is integrated into the display.

5. The control method of a many-to-one water electrolysis hydrogen production device based on hydrogen purity calculation according to any one of claims 1 to 4, characterized in that: The details are as follows: S1. Adjust the working mode of the hydrogen purity detection device and the alkali liquid flow control valve to the automatic mode, set the stable range value of hydrogen purity for a multiple-to-one water electrolysis hydrogen production device separation system based on hydrogen purity calculation, set the stable diversion value of the alkali liquid flow for a multiple-to-one water electrolysis hydrogen production device separation system based on hydrogen purity calculation, and use the control system to control the working state of each component of the main working electrolyzer, so that the alkali liquid, under the action of the alkali liquid flow control valve, alternately circulates or bidirectionally between the hydrogen purity regulating gas-liquid separator and the main working gas-liquid separator corresponding to the main working electrolyzer; S2. Using a hydrogen purity detection device to collect the actual value of hydrogen purity in the gas after separation by the gas-liquid separator in real time, and using the control system working state to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve; S3. Using the alkali liquid flow meter to collect the actual flow value of the alkali liquid in the alkali liquid feed control main line of the gas-liquid separator in real time, and using the working state of the control system to complete the diversion circulation of the alkali liquid under the action of the alkali liquid flow control valve; S4. Based on the fact that the difference between the set stable range value of hydrogen purity and the actual value of hydrogen purity is greater than a preset threshold, the control system automatically adjusts the working parameters of the alkali liquid flow control valve so that the difference between the stable steering diversion value and the actual flow value is no greater than the preset value.

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