Method for automatically adjusting gas supply of small-sized water electrolysis hydrogen production equipment under condition of no buffer tank

Abstract

The invention relates to a method for automatically adjusting gas supply of small-sized water electrolysis hydrogen production equipment under the condition of no buffer tank, which comprises the following steps of: sequentially arranging a three-way valve and a pressure transmitter on a conveying pipeline between a hydrogen production device and a use terminal from upstream to downstream; the power of the hydrogen production device and the bypass valve opening degree of the three-way valve are manually adjusted according to the gas consumption of the using terminal; the power of the hydrogen production device and the opening degree of the bypass valve of the three-way valve are automatically adjusted through the PLC according to the gas consumption of the using terminal. Hydrogen is generated through the small hydrogen production device, the gas supply pressure and the power of the hydrogen production device are adjusted under manual control of the three-way valve or PLC control, the hydrogen is stably supplied to the using terminal, hydrogen emission is reduced to the maximum extent, and electric energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen delivery methods, and in particular to a method for automatically adjusting gas supply of a small-scale water electrolysis hydrogen production device without a buffer tank. Background Art

[0002] In hydrogen-using terminals such as semiconductor equipment such as epitaxial furnaces, and other densely populated areas and high safety requirements where it is not possible to use bottled or buffer tanks to store hydrogen, hydrogen production equipment is required to stably supply hydrogen to the using terminals.

[0003] However, the existing small-scale water electrolysis hydrogen production equipment needs to be equipped with a buffer tank to ensure the stability of the terminal pressure and flow rate when the terminal gas consumption is unstable, which increases the storage safety risk, thus limiting its use in densely populated areas and key areas such as university laboratories. In addition, the gas output of the hydrogen generator in the existing equipment is greater than the usage, and the safety valve needs to frequently discharge excess gas, which not only causes waste, but also poses safety risks such as fire, lightning strike, and explosion.

[0004] Therefore, a new gas supply method is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a method for automatically adjusting the gas supply of a small-scale water electrolysis hydrogen production equipment without a buffer tank. The small-scale hydrogen production device generates hydrogen, and the three-way valve is manually controlled or controlled by PLC to adjust the gas supply pressure and the power of the hydrogen production device, so as to stably supply hydrogen to the user terminal, minimize hydrogen emissions, and reduce electricity consumption.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The method for automatically adjusting gas supply of a small-scale water electrolysis hydrogen production device without a buffer tank of the present invention comprises the following steps: a three-way valve and a pressure transmitter are sequentially arranged from upstream to downstream on a delivery pipeline between a hydrogen production device and a user terminal; the power of the hydrogen production device and the opening of a bypass valve of the three-way valve are manually adjusted according to the gas consumption of the user terminal; and the power of the hydrogen production device and the opening of the bypass valve of the three-way valve are automatically adjusted through a PLC according to the gas consumption of the user terminal.

[0008] The method described, preferably, manually adjusting the power of the hydrogen production device and the opening of the bypass valve of the three-way valve comprises the following steps: adjusting the current of the hydrogen production device to a preset range and the pressure of the generated hydrogen to a preset range through the power range of the hydrogen production device; setting the gas supply pressure requirement of the use terminal to a preset range; setting the three-way valve to a mechanical type, and setting the emptying threshold of the three-way valve to a preset range; when the gas production pressure of the hydrogen production device is greater than the highest preset value of the three-way valve, manually opening the bypass valve of the three-way valve to exhaust the hydrogen; when the gas production pressure of the hydrogen production device drops to the lowest preset value of the three-way valve, manually closing the bypass valve of the three-way valve, and opening the through valve to supply gas.

[0009] The method described, preferably, the manual adjustment of the power of the hydrogen production device and the bypass valve opening of the three-way valve also includes the following steps: during the emptying stage, the gas terminal continues to use the gas in the pipeline, and before the direct opening of the gas supply, it is ensured that the pressure in the pipeline at the use end is higher than the minimum gas supply pressure of the use terminal.

[0010] In the method, preferably, the preset range of the current of the hydrogen production device is 0 to 1800A, and the preset range of the pressure of the generated hydrogen is 0 to 1.6 MPa.

[0011] In the method described, preferably, the gas supply pressure requirement range of the terminal is not less than 0.55 MPa and not more than 1.0 MPa.

[0012] In the method described above, preferably, the three-way valve emptying threshold is 0.65-0.95 MPa.

[0013] The method, preferably, the automatic adjustment of the power of the hydrogen production device and the opening of the bypass valve of the three-way valve comprises the following steps:

[0014] The current of the hydrogen production device and the gas supply pressure of the use terminal are respectively set with a central threshold; the three-way valve is set as a solenoid valve;

[0015] Through PLC setting, the bypass valve of the three-way valve starts to open once within a preset time; when the gas production is greater than the usage, the current of the hydrogen production device is reduced by a preset value; when the hydrogen supply pressure is less than or equal to the first preset value for more than the preset time, the current of the hydrogen production device increases by a preset value per minute; when the hydrogen supply pressure is less than or equal to the second preset value for more than the preset time, the current of the hydrogen production device increases by a preset value per minute; when the hydrogen supply pressure is greater than or equal to the third preset value for more than the preset time, the current of the hydrogen production device is reduced by a preset value per minute, and when the hydrogen supply pressure is greater than or equal to the fourth preset value for more than the preset time, the current of the hydrogen production device is reduced by a preset value per minute.

[0016] In the method described, preferably, the central threshold value of the current of the hydrogen production device is 1200A, and the central threshold value of the gas supply pressure of the terminal is 0.80 MPa.

[0017] The method described above is preferably configured by PLC to start and open the bypass valve of the three-way valve once every 5 minutes.

[0018] According to the described method, preferably, when the gas production volume is greater than the usage volume, the current of the hydrogen production device is -50A; when the hydrogen supply pressure is ≤0.75 MPa for more than 1 minute, the current of the hydrogen production device is +25A per minute; when the hydrogen supply pressure is ≤0.70 MPa for more than 1 minute, the current of the hydrogen production device is +50A per minute; when the hydrogen supply pressure is ≥0.85 MPa for more than 1 minute, the current of the hydrogen production device is -25A per minute, and when the hydrogen supply pressure is ≥0.90 MPa for more than 1 minute, the current of the hydrogen production device is -50A per minute.

[0019] The present invention adopts the above technical solution, which has the following advantages:

[0020] (1) The present invention can effectively reduce safety spacing requirements and safety review requirements in densely populated areas and key safety areas such as university laboratories;

[0021] (2) The present invention can reduce the number of buffer tanks and auxiliary equipment, thereby reducing equipment costs and safety protection costs;

[0022] (3) The present invention can reduce the storage of hydrogen buffer tanks, reduce the number of times the three-way valve is emptied, and reduce potential safety risks such as explosion, fire, and lightning strike;

[0023] (4) The present invention can reduce the emission of hydrogen and the power consumption of the hydrogen production device, thereby achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the air supply device corresponding to the present invention.

[0026] The reference numerals in the figures are as follows:

[0027] 1-Hydrogen production device; 2-Transmission pipeline; 3-Three-way valve; 4-Evacuation pipeline; 5-Flame arrester; 6-Pressure transmitter; 7-Check valve; 8-PLC. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0029] The invention discloses a method for automatically adjusting gas supply of a small-scale water electrolysis hydrogen production device without a buffer tank. The method generates hydrogen through a small-scale hydrogen production device, and adjusts the gas supply pressure and the power of the hydrogen production device under manual or PLC control of a three-way valve, stably supplies hydrogen to a user terminal, minimizes hydrogen emission, and reduces power consumption.

[0030] like Figure 1 As shown, the present invention provides a stable automatic gas supply device for a hydrogen generator under non-buffered conditions, comprising: a hydrogen generator 1 and a user terminal, the hydrogen generator 1 and the user terminal are connected via a delivery pipeline 2; a three-way valve 3, arranged on the delivery pipeline 2 between the hydrogen generator 1 and the user terminal, and the bypass valve port of the three-way valve 3 is connected to a flame arrester 5 via an exhaust pipeline 4. The gas supply device also includes a pressure transmitter 6; the pressure transmitter 6 is arranged on the delivery pipeline 2 between the hydrogen generator 1 and the user terminal, and is located downstream of the three-way valve 3; the pressure transmitter 6 is used to detect the size of the gas supply pressure and output a signal. The gas supply device also includes a check valve 7; the check valve 7 is arranged on the delivery pipeline 2 between the hydrogen generator 1 and the three-way valve 3, and is used to prevent hydrogen from flowing back. The gas supply device also includes PLC8; PLC is electrically connected or signal-connected to the three-way valve 3, pressure transmitter 6 and hydrogen production device 1 respectively; PLC8 is used to adjust the opening and closing of the bypass valve port of the three-way valve 3 and the current size of the hydrogen production device 1 according to the size of the hydrogen use pressure.

[0031] The method for automatically adjusting gas supply of a small-scale water electrolysis hydrogen production equipment without a buffer tank provided by the present invention comprises the following steps:

[0032] S1. On the transmission pipeline between the hydrogen production device and the user terminal, a three-way valve and a pressure transmitter are installed from upstream to downstream;

[0033] S2. Manually adjust the power of the hydrogen production device and the opening of the bypass valve of the three-way valve according to the gas consumption of the terminal;

[0034] S3. Automatically adjust the power of the hydrogen production device and the opening of the bypass valve of the three-way valve through PLC according to the gas consumption of the terminal.

[0035] In the above embodiment, preferably, the manual adjustment of the power of the hydrogen production device and the opening of the bypass valve of the three-way valve in step S2 includes the following steps:

[0036] (1) According to the power range of the hydrogen production device, the current of the hydrogen production device is adjusted to a preset range, and the pressure of the generated hydrogen is adjusted to a preset range;

[0037] (2) Set the gas supply pressure requirement of the terminal to the preset range;

[0038] (3) The three-way valve is set to a mechanical type, and the emptying threshold of the three-way valve is set to a preset range;

[0039] (4) When the gas production pressure of the hydrogen production device is greater than the highest preset value of the three-way valve, manually open the bypass valve of the three-way valve to exhaust the hydrogen; when the gas production pressure of the hydrogen production device drops to the lowest preset value of the three-way valve, manually close the bypass valve of the three-way valve and open the straight-through valve to supply gas.

[0040] (5) During the emptying phase, the gas-using terminal continues to use the gas in the pipeline. Before directly opening the gas supply, ensure that the pressure in the pipeline at the using end is higher than the minimum gas supply pressure of the using terminal.

[0041] In the above embodiment, preferably, the preset range of the current of the hydrogen production device is 0 to 1800A, and the preset range of the pressure of the generated hydrogen is 0 to 1.6 MPa.

[0042] In the above embodiment, preferably, the gas supply pressure requirement range of the terminal is not less than 0.55 MPa and not more than 1.0 MPa.

[0043] In the above embodiment, preferably, the three-way valve emptying threshold is 0.65-0.95 MPa.

[0044] In the above embodiment, preferably, the automatic adjustment of the power of the hydrogen production device and the opening of the bypass valve of the three-way valve comprises the following steps:

[0045] (1) Setting a central threshold for the current of the hydrogen production device and the gas supply pressure of the user terminal respectively;

[0046] (2) The three-way valve is set as a solenoid valve;

[0047] (3) The bypass valve of the three-way valve is set to start and open once every preset time through PLC;

[0048] (4) When the gas production volume is greater than the usage volume, the current of the hydrogen production device is reduced by a preset value; when the hydrogen supply pressure is less than or equal to the first preset value for more than a preset time, the current of the hydrogen production device increases by a preset value per minute; when the hydrogen supply pressure is less than or equal to the second preset value for more than a preset time, the current of the hydrogen production device increases by a preset value per minute; when the hydrogen supply pressure is greater than or equal to the third preset value for more than a preset time, the current of the hydrogen production device is reduced by a preset value per minute; when the hydrogen supply pressure is greater than or equal to the fourth preset value for more than a preset time, the current of the hydrogen production device is reduced by a preset value per minute.

[0049] In the above embodiment, preferably, the central threshold value of the current of the hydrogen production device is 1200A, and the central threshold value of the gas supply pressure of the terminal is 0.80 MPa.

[0050] In the above embodiment, preferably, the bypass valve of the three-way valve is started and opened once every 5 minutes through the PLC setting.

[0051] In the above embodiment, preferably, when the gas production amount is greater than the usage amount, the current of the hydrogen production device is -50A; when the hydrogen supply pressure is ≤0.75 MPa for more than 1 minute, the current of the hydrogen production device is +25A per minute; when the hydrogen supply pressure is ≤0.70 MPa for more than 1 minute, the current of the hydrogen production device is +50A per minute; when the hydrogen supply pressure is ≥0.85 MPa for more than 1 minute, the current of the hydrogen production device is -25A per minute, and when the hydrogen supply pressure is ≥0.90 MPa for more than 1 minute, the current of the hydrogen production device is -50A per minute.

[0052] Embodiment 1:

[0053] Manual control: If the power adjustment range of the hydrogen production device is 0-1800A, the generated hydrogen pressure is 0-1.6 MPa, and the terminal gas supply pressure requirement is not less than 0.55 MPa and not more than 1.0 MPa, then the three-way valve emptying threshold can be set to 0.65-0.95 MPa. When the gas production pressure is greater than 0.95 MPa, the three-way valve bypass opens and the hydrogen is emptied. When the pressure at the gas production end drops to 0.65 MPa, the bypass is closed and the gas supply is opened directly. During the emptying stage, the gas terminal continues to use the gas in the pipeline. Before the direct opening of the gas supply, it is necessary to ensure that the pressure in the terminal pipeline is higher than 0.55 MPa. In this way, the terminal can be stably supplied with gas under the control of the pressure regulating valve and flow meter.

[0054] Embodiment 2:

[0055] Automatic control: A central threshold is set for the hydrogen production device and the gas supply pressure respectively (set according to the typical usage of the terminal), such as: the current is set to 1200A, the gas supply pressure is 0.80 MPa, when the equipment is stable, the manual control is switched to automatic control, the emptying valve is started once every 5 minutes, at which time the gas production is greater than the usage, and the current of the hydrogen production device is -50A; when the hydrogen supply pressure is ≤0.75 MPa for more than 1 minute, the current of the hydrogen production device is +25A per minute; when the hydrogen supply pressure is ≤0.70 MPa for more than 1 minute, the current of the hydrogen production device is +50A per minute; when the hydrogen supply pressure is ≥0.85 MPa for more than 1 minute, the current of the hydrogen production device is -25A per minute, and when the hydrogen supply pressure is ≥0.90 MPa for more than 1 minute, the current of the hydrogen production device is -50A per minute; and so on. All pressure thresholds and time nodes need to match the actual usage, so that the gas production of the hydrogen production device matches the actual usage of the equipment, thereby minimizing the number of emptying times of the three-way valve.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatically adjusting gas supply in a small-scale water electrolysis hydrogen production equipment without a buffer tank, characterized in that: The steps include: On the transmission pipeline between the hydrogen production device and the user terminal, a three-way valve and a pressure transmitter are arranged in sequence from upstream to downstream; Manually adjust the power of the hydrogen production device and the bypass valve opening of the three-way valve according to the gas consumption of the terminal; The power of the hydrogen production device and the opening of the bypass valve of the three-way valve are automatically adjusted through PLC according to the gas consumption of the terminal.

2. The method according to claim 1, characterized in that The manual adjustment of the power of the hydrogen production device and the bypass valve opening of the three-way valve comprises the following steps: Through the power range of the hydrogen production device, the current of the hydrogen production device is adjusted to a preset range, and the pressure of the generated hydrogen is within a preset range; Set the gas supply pressure requirement of the terminal to the preset range; The three-way valve is set to a mechanical type, and the emptying threshold of the three-way valve is set to a preset range; When the gas production pressure of the hydrogen production device is greater than the highest preset value of the three-way valve, the bypass valve of the three-way valve is manually opened to exhaust the hydrogen; when the gas production pressure of the hydrogen production device drops to the lowest preset value of the three-way valve, the bypass valve of the three-way valve is manually closed and the straight-through valve is opened to supply gas.

3. The method according to claim 2, characterized in that The manual adjustment of the power of the hydrogen production device and the bypass valve opening of the three-way valve also includes the following steps: During the emptying phase, the gas-using terminal continues to use the gas in the pipeline, and before the direct opening of the gas supply, it is ensured that the pressure in the pipeline at the using end is higher than the minimum gas supply pressure of the using terminal.

4. The method according to claim 2, characterized in that: The preset range of the current of the hydrogen production device is 0 to 1800A, and the preset range of the pressure of the generated hydrogen is 0 to 1.6 MPa.

5. The method according to claim 2, characterized in that: The gas supply pressure requirement range of the terminal is not less than 0.55 MPa and not more than 1.0 MPa.

6. The method according to claim 2, characterized in that The three-way valve emptying threshold is 0.65~0.95 MPa.

7. The method according to claim 1, characterized in that The automatic adjustment of the power of the hydrogen production device and the bypass valve opening of the three-way valve comprises the following steps: A central threshold is set for the current of the hydrogen production device and the gas supply pressure of the user terminal respectively; The three-way valve is set as a solenoid valve; Through PLC setting, the bypass valve of the three-way valve starts to open once every preset time; When the gas production volume is greater than the usage volume, the current of the hydrogen production device is reduced to a preset value; When the hydrogen supply pressure is less than or equal to the first preset value for more than a preset time, the current of the hydrogen production device increases by a preset value per minute; When the hydrogen supply pressure is less than or equal to the second preset value for more than a preset time, the current of the hydrogen production device increases by a preset value per minute; When the hydrogen supply pressure is greater than or equal to the third preset value for more than a preset time, the current of the hydrogen production device decreases by a preset value per minute. When the hydrogen supply pressure is greater than or equal to the fourth preset value for more than a preset time, the current of the hydrogen production device decreases by a preset value per minute.

8. The method according to claim 7, characterized in that The central threshold value of the current of the hydrogen production device is 1200A, and the central threshold value of the gas supply pressure of the terminal is 0.80 MPa.

9. The method according to claim 7, characterized in that: The bypass valve of the three-way valve is started and opened once every 5 minutes through PLC setting.

10. The method according to claim 7, characterized in that When the gas production volume is greater than the usage volume, the current of the hydrogen production device is -50A; when the hydrogen supply pressure is ≤0.75 MPa for more than 1 minute, the current of the hydrogen production device is +25A per minute; when the hydrogen supply pressure is ≤0.70 MPa for more than 1 minute, the current of the hydrogen production device is +50A per minute; when the hydrogen supply pressure is ≥0.85 MPa for more than 1 minute, the current of the hydrogen production device is -25A per minute, when the hydrogen supply pressure is ≥0.90 MPa for more than 1 minute, the current of the hydrogen production device is -50A per minute.

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