Green electricity hydrogen production method

Abstract

The invention discloses a green electricity hydrogen production method, and belongs to the technical field of hydrogen production and green electricity hydrogen production equipment.The green electricity hydrogen production method comprises the steps that firstly, the preset value range of working parameters is set; 2, starting a hydrogen production device; 3, when the working parameter implementation value in the hydrogen production device exceeds the preset value range, the controller automatically adjusts the hydrogen production device so that the working parameter implementation value of the hydrogen production device can return to the preset value range. According to the green electricity hydrogen production method disclosed by the embodiment of the invention, the hydrogen production device is automatically controlled through the controller, the workload of operators can be reduced to the maximum extent, the system has clear parameters, the system only needs to operate according to the parameters, the system is stable and reliable, and stable work of the hydrogen production device can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of green electricity hydrogen production equipment, and in particular to a green electricity hydrogen production method. Background Art

[0002] Hydrogen energy technology is a major direction of the world's energy and power transformation. Accelerating the development of hydrogen energy-related industries is an option to respond to global climate change, ensure energy supply security and achieve sustainable development.

[0003] Although the water electrolysis process consumes a lot of energy, it is still a better choice due to the volatility of wind power, photovoltaic and other power sources. However, it puts forward higher requirements on the power fluctuation range and system control of the water electrolysis hydrogen production system. In the future large-scale renewable energy hydrogen production scenario, flexible control and safe and efficient hydrogen production systems will be well suited for green electricity hydrogen production. However, in actual projects, there are problems such as large workload for personnel operation and unclear system operation strategy. Summary of the invention

[0004] The present invention discloses a method for producing hydrogen using green electricity to improve the above-mentioned problems.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] Based on the above objectives, the present invention discloses a method for producing hydrogen from green electricity, comprising the following steps:

[0007] Step 1: Set the predetermined value range of the working parameters;

[0008] Step 2: Start the hydrogen production device;

[0009] Step 3: When the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range, the controller automatically adjusts the hydrogen production device to make the implementation value of the working parameter of the hydrogen production device return to the predetermined value range.

[0010] Optionally: Also include:

[0011] Step 4: Determine whether the self-adjustment function of the hydrogen production device is normal. If it is normal, the hydrogen production device works normally. Otherwise, use the controller to control the hydrogen production device to stop working.

[0012] Optionally: a preset control time is set, and if the hydrogen production device does not return to a normal working state within the preset control time period, the hydrogen production device is stopped from working, otherwise, the hydrogen production device continues to work.

[0013] Optionally: in the step 2, the temperature of the alkali solution is determined. When the temperature of the alkali solution is higher than or equal to a preset temperature, the hydrogen production device can be quickly started, otherwise, a cold start is performed.

[0014] Optionally: Also include:

[0015] Step 5: Set a preset downtime. After the hydrogen production device stops working, determine whether the stop time of the hydrogen production device exceeds the preset downtime. If not, continue to maintain the alkali solution temperature to the preset temperature, otherwise, stop heating the alkali solution.

[0016] Optionally: in step 2, multiple hydrogen production devices are operated simultaneously, and the health value of each hydrogen production device is calculated respectively. When starting, each hydrogen production device is started in sequence from low to high health value.

[0017] Optionally: extract the electrolyzer current I, the total electrolyzer voltage U, the electrolyzer operating temperature T, the electrolyzer running time H, the pump vibration value D, the number of starts and stops N, and the chamber voltage consistency M, set the reference value X, and then set the parameter reference values ​​I0, Q0, U0, T0, H0, D0, N0 and M0, name each of the hydrogen production devices from 1 to i, and the health value calculation formula is: Qi=Xi Ui(1+(U0-Ui) / U0)+Xi T i(1+(T0-T i) / T0)+Xi H i(1+(H0-H i) / H0)+Xi Di(1+(D0-Di) / D0)+Xi N i(1+(N0-N i) / N0)+Xi Mi(1+(M0-M i) / M0).

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The embodiment of the present invention discloses a green electricity hydrogen production method, which includes the following steps: step one: setting a predetermined value range of a working parameter; step two: starting a hydrogen production device; step three: when the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range, the controller automatically adjusts the hydrogen production device to make the implementation value of the working parameter of the hydrogen production device return to the predetermined value range.

[0020] The green electricity hydrogen production method disclosed in this embodiment performs automatic control of the hydrogen production device through a controller, which can reduce the workload of operators to the greatest extent. The system has clear parameters, and the system only needs to operate according to the parameters. The system is stable and reliable and can ensure the stable operation of the hydrogen production device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of the green electricity hydrogen production method disclosed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the green electricity hydrogen production equipment or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] Example:

[0031] See also Figure 1 The embodiment of the present invention discloses a green electricity hydrogen production method, which includes the following steps: step one: setting a predetermined value range of a working parameter; step two: starting a hydrogen production device; step three: when the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range, the controller automatically adjusts the hydrogen production device to make the implementation value of the working parameter of the hydrogen production device return to the predetermined value range.

[0032] The green electricity hydrogen production method disclosed in this embodiment performs automatic control of the hydrogen production device through a controller, which can reduce the workload of operators to the greatest extent. The system has clear parameters, and the system only needs to operate according to the parameters. The system is stable and reliable and can ensure the stable operation of the hydrogen production device.

[0033] After the equipment is started, the control logic of automatic current setting is executed respectively. At the same time, the pressure and temperature systems of the subsequent stage are controlled by the system overshoot control strategy to ensure the operation accuracy of the equipment and the safety performance of the system. In the pre-start position of the equipment, the system determines whether the start-up conditions are met through the self-test process, and connects the external hydrogen storage tank and nitrogen pipeline through the hydrogen separator and oxygen separator respectively, and performs rapid pressure increase adjustment through the solenoid valve.

[0034] In step 3, the operating parameters include operating pressure, operating temperature, hydrogen liquid level, hydrogen purity, oxygen liquid level and oxygen purity. Initially, a predetermined value range is set for each operating parameter. Later, during the operation of the hydrogen production device, if one of the operating parameters exceeds the predetermined value range, the controller needs to control the relevant components of the hydrogen production device so that the relevant operating parameters of the hydrogen production device can return to the predetermined value range.

[0035] In another embodiment, the green electricity hydrogen production method comprises the following steps:

[0036] Step 1: Set a predetermined value range of the working parameters, preset the adjustment time of the first control system, and set the delay time of the third control system.

[0037] Step 2: Determine the temperature of the alkali solution. When the temperature of the alkali solution is higher than or equal to the preset temperature, the hydrogen production device can be directly started quickly, otherwise, it is cold started. In this embodiment, the system is divided into hot standby and cold start states. The hot standby and cold start definitions of the equipment refer to the temperature of the alkali solution. In this embodiment, the preset temperature of the alkali solution can be set to 50°C. When the temperature of the alkali solution is equal to or higher than 50°C, the system is a hot standby device. At this time, the hydrogen production device can be directly started quickly. When the temperature of the alkali solution is lower than 50°C, the system is in a cold start state. At this time, the hydrogen production device can only be cold started. Of course, in other embodiments, it is also possible to set the preset temperature of the alkali solution to 48°C, 49°C, 51°C or 52°C.

[0038] Step 3: When the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range, the controller automatically adjusts the hydrogen production device to make the implementation value of the working parameter of the hydrogen production device return to the predetermined value range.

[0039] Step 4: The controller is provided with a first control system, a second control system and a third control system. The first control system is used to receive sensor data and adjust the working state of the hydrogen production device according to the data, and the second control system is used to monitor whether the operation of the first control system is normal. When the second control system detects that the operation of the first control system is abnormal, the second control system starts the third control system to work. The third control system is used to receive sensor data and control the hydrogen production device to stop working when the working parameter implementation value in the hydrogen production device exceeds the predetermined value range.

[0040] After receiving the normal shutdown or interlocking shutdown signal, the system executes the shutdown procedure, and the pressure is gradually reduced through the hydrogen and oxygen regulating valves. The alkali liquid circulation pump works for more than half an hour, and the internal alkali liquid performs natural cooling. After the equipment is shut down, the analyzer is automatically cut off by the cut-off solenoid valve, and the external venting pipeline is filled with nitrogen for protection to avoid battery impact.

[0041] When the equipment needs to be shut down, two modes can be considered. The first is that the current is adjusted to zero and the hot standby state is automatically executed. The second is the fault shutdown state. At this time, the comprehensive fault point cannot automatically start the equipment. At this time, after manual maintenance, it is restored to automatic mode and continues to participate in automatic control.

[0042] Wherein, a preset control time is set. If the hydrogen production device does not return to a normal working state within the preset control time period, the hydrogen production device is stopped from working; otherwise, the hydrogen production device continues to work.

[0043] It should be noted that the setting and adjustment time of various working parameters of the hydrogen production device are independent of each other, that is, when the first working parameter is adjusted, the second working parameter is also adjusted at the same time. Even if the second working parameter has returned to the preset value range within 10 minutes, and the first working parameter has not returned to the preset value range after 10 minutes, the hydrogen production device will still stop working.

[0044] In addition, a delay circuit is also provided in the third control system. After the third control system is started, the delay circuit is triggered when the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range. During the triggering period of the delay circuit, if the first control system resumes normal operation, the third control system stops working, otherwise the third control system stops working.

[0045] The green electricity hydrogen production method disclosed in this embodiment can adjust multiple hydrogen production devices at the same time, that is, multiple hydrogen production devices can work at the same time. At this time, the health value of each hydrogen production device can be calculated separately, and when starting, each hydrogen production device is started in order from low to high health value.

[0046] Specifically, the electrolyzer current I, the total electrolyzer voltage U, the electrolyzer operating temperature T, the electrolyzer operating time H, the pump vibration value D, the number of starts and stops N, and the chamber voltage consistency M are extracted, the benchmark value X is set, and then the parameter benchmark values ​​I0, Q0, U0, T0, H0, D0, N0 and M0 are set, and each of the hydrogen production devices is named from 1 to i. The health value calculation formula is: Qi=XiUi(1+(U0-Ui) / U0)+XiTi(1+(T0-Ti) / T0)+XiHi(1+(H0-Hi) / H0)+XiDi(1+(D0-Di) / D0)+XiNi(1+(N0-N i) / N0)+XiMi(1+(M0-Mi) / M0).

[0047] The health status is sorted, so the execution logic starts up in order from low health status to high health status, and the system startup is completed in sequence when the equipment reaches the minimum load. What needs to be emphasized here is that in addition to the health status sorting, the equipment startup status is started one by one according to the minimum load of 20% to 40%. This setting can achieve rapid startup of the system and ensure that the product gas is qualified.

[0048] During the stable operation of the system, when the system purity reaches 80% of the upper limit, the dynamic power response of the device is stopped. When the cell voltage evaluation M score is low or abnormal, the device is directly shut down and re-evaluated.

[0049] This embodiment also provides a method for producing hydrogen from green electricity. This embodiment is a further improvement on the technical solutions of the above embodiments. The technical solutions described in the above embodiments are also applicable to this embodiment, and the technical solutions disclosed in the above embodiments will not be described repeatedly.

[0050] Specifically, the difference between this embodiment and the above embodiment is that the green electricity hydrogen production method disclosed in this embodiment also includes step five: setting a preset downtime, after the hydrogen production device stops working, judging whether the stop time of the hydrogen production device exceeds the preset downtime, if not, then continue to maintain the alkali solution temperature to the preset temperature, otherwise, stop heating the alkali solution. In this embodiment, the preset downtime can be set to 7 days, that is, when the hydrogen production device does not reach 7 days of downtime, it will continue to heat the alkali solution, so that the temperature of the alkali solution dynamically reaches 50°C, so that the hydrogen production device can be quickly started next time; and if the hydrogen production device is still not restarted after 7 days of downtime, the heating of the alkali solution will be stopped.

[0051] The embodiment of the present invention also discloses a green electricity hydrogen production device, which includes a hydrogen production device, a sensor and a controller. The sensor is installed on the hydrogen production device, and the sensor is used to monitor the working parameters of the hydrogen production device. The controller is electrically connected to the sensor and the hydrogen production device, and the controller is used to receive data from the sensor and adjust the working state of the hydrogen production device according to the data.

[0052] The green electricity hydrogen production equipment disclosed in this embodiment realizes automatic control of the hydrogen production device through a controller, which can reduce the workload of operators to the maximum extent. The system has clear parameters, and the system only needs to operate according to the parameters. The system is stable and reliable and can ensure the stable operation of the hydrogen production device.

[0053] The hydrogen production device includes an electrolyzer, a hydrogen collection structure, an oxygen collection structure, a gas-liquid processor and a pressurizing structure. The hydrogen collection structure and the oxygen collection structure are both connected to the electrolyzer, and the hydrogen collection structure and the oxygen collection structure are both provided with a gas-liquid processor and a pressurizing structure. The working parameters include working pressure, working temperature, hydrogen liquid level, hydrogen purity, oxygen liquid level and oxygen purity. The sensors include pressure sensors, temperature sensors, liquid level sensors and purity sensors. The controller adjusts each working parameter according to the data monitored by each sensor.

[0054] It also includes an alarm. The electrolyzer, hydrogen collection structure, oxygen collection structure, gas-liquid processor and pressurization structure are all equipped with alarms. Each alarm is set in a one-to-one correspondence with each sensor. When the sensor detects that the data exceeds the preset range, the alarm will sound.

[0055] After the equipment is started, the control logic of automatic current setting is executed respectively. At the same time, the pressure and temperature systems of the subsequent stage are controlled by the system overshoot control strategy to ensure the operation accuracy of the equipment and the safety performance of the system. The system scheduling is ensured by absorbing the hydrogen production power in real time with the upstream system. When the system has multiple electrolyzers, the serial numbers are 1 to i electrolyzers.

[0056] During the debugging and startup phase, the initial health level Qci is calculated through data evaluation and the health levels are sorted. Therefore, the execution logic starts up in order from low health to high health, and the system startup is completed in sequence when the equipment reaches the minimum load. What needs to be emphasized here is that in addition to the health level sorting, the equipment startup status is started one by one according to the minimum load of 20% to 40%. This setting can achieve rapid startup of the system and ensure that the product gas is qualified.

[0057] Next, after the equipment is fully started and stabilized, the overall status of the equipment is re-evaluated and scored every day, and stable power is allocated to the grouped equipment with the highest health value in turn, and the equipment with lower scores bears the fluctuating operating conditions. Preferably, the optimal operating condition of the system equipment is 60% to 100%, and different modules can be stopped below this condition; further, 1 to i devices can be grouped, and lower array work can be performed between different groups, and the interval period is rotated on a daily basis.

[0058] When the equipment is running under fluctuating conditions, the liquid level and temperature adjustment modes refer to the pressure adjustment mode, and the key parameters such as the voltage, current, and circulation volume of the battery cell are associated, while focusing on the purity change index to achieve dynamic adjustment of parameters. Here is an example of temperature control logic, according to the heat balance formula:

[0059] Alkali solution circulation heat Q liquid = m liquid c liquid △ t tank (related to electrolytic cell current and voltage)

[0060] Cooling water heat Qcold = mcold ccold △tcold

[0061] Through the time relationship, the cooling water volume is calculated in advance. In the traditional control method, for example, by comparing the post-slot temperature setting value with the post-slot temperature, the opening of the refrigerant regulating valve is adjusted through the PID. Since the post-slot temperature has exceeded the setting value at this time, the opening of the refrigerant valve regulating valve is relatively large. The present invention balances the refrigerant flow rate so that the opening of the regulating valve is at a reasonable position, thereby realizing advanced regulation.

[0062] The pressure and liquid level adjustment steps are to optimize the cumulative calculation value of gas production under different currents and adjust the CV value of the valve in advance.

[0063] Set the maximum current, maximum gas production, simulate gas production, set the container volume, calculate the pressure

[0064] PV = nRT, p = (accumulated gas production value * 89.3 * 0.5 * 8.31 * (273 + 20)) / volume V

[0065] (One standard cubic meter of hydrogen is equal to 89.3g, 22.4L of hydrogen is 1mol, about 2g, R is 8.31, T is 273+20)

[0066] p=(accumulated value of gas production*89.3*0.5*8.31*(273+20)) / volume V H2

[0067] P = gas production * 108715.16 / volume m3 pa

[0068] Similarly, the level difference reflects the pressure difference △P = pgh

[0069] In summary, when the system fluctuates rapidly, overshoot control can be achieved by quickly adjusting each system parameter (PID adjustment).

[0070] The green electricity hydrogen production device disclosed in this embodiment generally works as follows: 1) When the equipment is under slight positive pressure, it enters the equipment pre-start position, and the system performs self-checking. First, the automatic exhaust valves at the inlet and outlet of the alkali liquid circulation pump are intermittently opened for 10s and then closed, and the connection is executed more than 3 times to start the alkali liquid circulation pump; the pressure is quickly increased by external qualified hydrogen and nitrogen, and the gas is intermittently controlled by the solenoid valve to achieve a system pressure of not less than 0.5MPa. 2) After the equipment receives the start-up instruction, the current value and system pressure are given one by one through manual setting, and the system parameters are observed to be normal. When there is no abnormality, the system parameters are gradually increased to the rated working state; 3) Confirmation and operation of the peripheral system. Before the equipment works, it is necessary to purge and replace the system, exhaust the alkali liquid circulation pump, and check whether the supply of various instrument parameters, water, electricity, etc. is normal; 4) Judgment and analysis of the actual working status of each device after startup, mainly including instrument readings, whether there is pipeline leakage, working partition and vibration size of the circulation pump, whether there is equipment noise, etc.; 5) Treatment measures after equipment failure. After the equipment is started up, it is gradually brought into the adjustable range, the basis for determining the key parameters of the system is increased, and the "health" statistics of each device or structure are completed in turn.

[0071] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for producing hydrogen from green electricity, characterized in that: The steps include: Step 1: Set the predetermined value range of the working parameters; Step 2: Start the hydrogen production device; Step 3: When the implementation value of the working parameter in the hydrogen production device exceeds the predetermined value range, the controller automatically adjusts the hydrogen production device to make the implementation value of the working parameter of the hydrogen production device return to the predetermined value range.

2. The green electricity hydrogen production method according to claim 1, characterized in that: Also includes: Step 4: Determine whether the self-adjustment function of the hydrogen production device is normal. If it is normal, the hydrogen production device works normally. Otherwise, use the controller to control the hydrogen production device to stop working.

3. The green electricity hydrogen production method according to claim 2, characterized in that: A preset control time is set. If the hydrogen production device does not return to a normal working state within the preset control time period, the hydrogen production device is stopped from working. Otherwise, the hydrogen production device continues to work.

4. The green electricity hydrogen production method according to claim 2, characterized in that: In the step 2, the temperature of the alkali solution is determined. When the temperature of the alkali solution is higher than or equal to a preset temperature, the hydrogen production device can be quickly started; otherwise, a cold start is performed.

5. The green electricity hydrogen production method according to claim 4, characterized in that: Also includes: Step 5: Set a preset downtime. After the hydrogen production device stops working, determine whether the stop time of the hydrogen production device exceeds the preset downtime. If not, continue to maintain the alkali solution temperature to the preset temperature, otherwise, stop heating the alkali solution.

6. The green electricity hydrogen production method according to any one of claims 1 to 5, characterized in that: In the step 2, a plurality of hydrogen production devices are operated simultaneously, and the health value of each hydrogen production device is calculated respectively. When starting, each hydrogen production device is started in sequence from low to high health value.

7. The green electricity hydrogen production method according to claim 6, characterized in that: Extract the electrolyzer current I, the total electrolyzer voltage U, the electrolyzer operating temperature T, the electrolyzer running time H, the pump vibration value D, the number of starts and stops N, and the chamber voltage consistency M, set the benchmark value X, and then set the parameter benchmark values ​​I0, Q0, U0, T0, H0, D0, N0 and M0, name each of the hydrogen production devices from 1 to i, and the health value calculation formula is: Qi=XiUi(1+(U0-Ui) / U0)+XiTi(1+(T0-Ti) / T0)+XiHi(1+(H0-Hi) / H0)+XiDi(1+(D0-Di) / D0)+XiNi(1+(N0-Ni) / N0)+XiMi(1+(M0-Mi) / M0).

Images