Automatic alkali preparation system and alkali preparation method

Abstract

The invention provides an automatic alkali preparation system and an alkali preparation method, and relates to the technical field of water electrolysis hydrogen production. The automatic alkali preparation system comprises a first alkali preparation container, the first alkali preparation container is provided with a first liquid inlet for introducing alkali liquor, and a first valve is arranged at the first liquid inlet; a second liquid inlet is formed and used for introducing pure water, and a second valve is arranged at the second liquid inlet; the first liquid inlet is provided with a first flow detection device for calculating the amount of alkali liquor, the second liquid inlet is provided with a second flow detection device for calculating the amount of pure water, the first alkali preparation container is provided with a plurality of liquid level scales, the two ends of the first circulation pipeline are communicated with the first alkali preparation container, and liquid in the first alkali preparation container circulates through the first driving device; a concentration detection device is arranged on the first circulation pipeline, and the control device is in communication connection with all the components and controls the first valve, the second valve and the first driving device to be opened and closed according to detection signals and the liquid level height. According to the technical scheme, automatic alkali preparation can be achieved, and it is guaranteed that the concentration of prepared alkali liquor is accurate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of hydrogen production by water electrolysis, and in particular to an automatic alkali preparation system and an alkali preparation method. Background Art

[0002] Water electrolysis hydrogen production technology uses the principle of electrolysis to improve the conductivity of water by adding a certain concentration of alkaline solution (such as KOH or NaOH solution) as an electrolyte to the water electrolyzer. When direct current is applied to the electrolyzer, water molecules decompose at the anode to produce oxygen, while hydrogen is generated at the cathode. In this process, the addition of alkaline solution helps to accelerate the electrolysis reaction and promote the effective generation of hydrogen.

[0003] The prior art uses a circulation system to automatically control the speed at which alkali flakes are added to the alkali water tank, thereby adjusting the concentration of the alkali solution. The system is divided into two parts: an internal circulation and an external circulation: the internal circulation is responsible for allowing the alkali flakes to fully contact and react with water to ensure that the alkali solution is evenly mixed. The external circulation transports the mixed alkali solution to the desired location to complete the proportional injection of the alkali solution. However, this system does not have the ability to accurately control the concentration of the alkali solution in real time. In order to detect the concentration, it is necessary to stop the circulation pump after a period of internal circulation, take samples through the exhaust valve, and use a hydrometer to measure the concentration of the alkali solution. This method is not only cumbersome, but also time-consuming. In addition, although a higher alkali solution concentration can speed up the reaction rate, it also increases the resistance of the electrolyte, reduces the current efficiency, and a high concentration of alkali solution may also increase material costs.

[0004] Therefore, a kind of automatic alkali preparation system is needed to at least solve the above-mentioned problems. Summary of the invention

[0005] A technical problem to be solved by the present disclosure is: how to solve the problems of inaccurate control of alkali solution concentration, complex and time-consuming operation in the alkali preparation process of the existing alkali preparation device.

[0006] In order to solve the above technical problems, the present disclosure provides an automatic alkali preparation system, comprising:

[0007] The first alkali preparation container has a first liquid inlet and a second liquid inlet, the first liquid inlet is used to introduce alkali solution, the second liquid inlet is used to introduce pure water, the first liquid inlet is provided with a first valve, the second liquid inlet is provided with a second valve, the first valve and the second valve are respectively used to control the on-off of the first liquid inlet and the second liquid inlet; a first flow detection device is provided at the first liquid inlet, and a second flow detection device is provided at the second liquid inlet, the first flow detection device is used to calculate the amount of alkali solution introduced, and the second flow detection device is used to calculate the amount of pure water introduced, and the first alkali preparation container is also provided with a plurality of liquid level scales; a first circulation pipeline, the two ends of the first circulation pipeline are respectively connected to the first The first alkali preparation container is connected, the liquid in the first alkali preparation container circulates in the first circulation pipeline and the first alkali preparation container through the first driving device, the first circulation pipeline is provided with a concentration detection device, which is used to detect the concentration of the liquid flowing through the first circulation pipeline; and a control device, the control device is respectively communicated with the first valve, the second valve, the first flow detection device, the second flow detection device, the first driving device and the concentration detection device; wherein the control device controls the opening and closing of the first valve, the second valve and the first driving device according to the detection signals of the concentration detection device, the first flow detection device and the second flow detection device, and the liquid level height in the first alkali preparation container.

[0008] In some embodiments, the automatic alkali preparation system also includes: a liquid level sensor, which is arranged on the first alkali preparation container and is used to detect the liquid level height in the first alkali preparation container, and the control device is communicatively connected with the liquid level sensor; the liquid level scale includes a first scale, a second scale, a third scale and a fourth scale arranged in sequence from bottom to top along the vertical direction.

[0009] In some embodiments, a drain port is provided at the bottom of the first alkali preparation container in the vertical direction, and a drain valve is provided at the drain port; a control device is electrically connected to the drain valve, and the control device controls the opening and closing of the drain valve according to a detection signal of a liquid level sensor.

[0010] In some embodiments, the automatic alkali preparation system also includes: a second alkali preparation container, the second alkali preparation container has a third liquid inlet and a fourth liquid inlet, the third liquid inlet is used to introduce alkali liquid raw material, the fourth liquid inlet is used to introduce pure water, the third liquid inlet is provided with a third valve, the fourth liquid inlet is provided with a fourth valve, the third valve and the fourth valve are used to control the opening and closing of the third liquid inlet and the fourth liquid inlet respectively; the liquid outlet of the second alkali preparation container is connected to the first liquid inlet of the first alkali preparation container, and the liquid in the second alkali preparation container enters the first alkali preparation container through the second driving device.

[0011] In some embodiments, a stirring device is provided in the second alkali preparation container, and the stirring device is used to stir the liquid in the second alkali preparation container.

[0012] In some embodiments, the automatic alkali preparation system also includes: an electrolysis device, a first alkali preparation container is connected to the liquid inlet of the electrolysis device, and the liquid in the first alkali preparation container enters the electrolysis device through a third driving device and is electrolyzed in the electrolysis device; a cooling device, the cooling device is connected to the liquid outlet of the electrolysis device, and the liquid electrolyzed in the electrolysis device can enter the cooling device for cooling and separation; a second circulation pipeline, the cooling device is connected to the first alkali preparation container through the second circulation pipeline, and the liquid cooled by the cooling device can enter the first alkali preparation container through the second circulation pipeline.

[0013] In some embodiments, the automatic alkali preparation system also includes: a third circulation pipeline, both ends of the third circulation pipeline are respectively connected to the first circulation pipeline, and the position of the liquid inlet of the third circulation pipeline on the first circulation pipeline is far away from the first alkali preparation container relative to the first driving device; the concentration detection device is arranged on the third circulation pipeline, and a fifth valve is provided on both ends of the concentration detection device on the third circulation pipeline.

[0014] In some embodiments, an exhaust port is provided at the top of the first alkali preparation container along the vertical direction, and an exhaust valve is provided at the exhaust port, and the exhaust valve is used to control the opening and closing of the exhaust port.

[0015] The present disclosure also provides a alkali preparation method, which is applied to the above-mentioned automatic alkali preparation system, including:

[0016] S1: setting four liquid level heights in the first alkali preparation container from bottom to top in the vertical direction, namely the first scale, the second scale, the third scale and the fourth scale;

[0017] S2: adding a first alkali solution into the first alkali preparation container, and when it is detected that the liquid level reaches a second scale, adding pure water into the first alkali preparation container, and when it is detected that the liquid level reaches a third scale, starting the first driving device to make the liquid in the first alkali preparation container circulate through the first circulation pipeline for a first preset time;

[0018] S3: Detecting the concentration of the liquid in the first circulation pipeline. If the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, the concentration of the alkali solution or the amount of pure water required to be put into the first alkali preparation container is calculated according to the detection information, and the first alkali solution or pure water is added to the first alkali preparation container according to the calculation result, and the first driving device is started again, so that the liquid in the first alkali preparation container circulates through the first circulation pipeline again for a second preset time, and the concentration of the liquid in the first circulation pipeline is detected again;

[0019] S4: when the liquid level of the first alkali preparation container reaches the fourth scale, the drain valves at the bottom of the first alkali preparation container are controlled to open until the liquid in the first alkali preparation container is discharged to the third scale;

[0020] S5: starting the first driving device to make the liquid in the first alkali preparation container circulate through the first circulation pipeline for a third preset time, detecting the concentration of the liquid in the first circulation pipeline, and if the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, repeating step S3 until an alkali solution with a preset concentration value is obtained;

[0021] S6: delivering the alkali solution with a preset concentration value in the first alkali preparation container to the electrolysis device, and when it is detected that the liquid level of the first alkali preparation container reaches a first scale, repeating steps S2 to S4.

[0022] In some embodiments, step S2 of adding the first alkali solution into the first alkali preparation container includes: firstly adding alkali solution raw materials and pure water into the second alkali preparation container to obtain the first alkali solution, and then transporting the obtained first alkali solution to the first alkali preparation container through the second driving device; the concentration value of the first alkali solution is greater than the preset concentration value.

[0023] Through the above technical scheme, the automatic alkali preparation system provided by the present disclosure can automatically adjust the opening and closing of the first valve and the second valve and the start and stop of the first driving device according to the set concentration requirements through the control device, so as to realize the automatic preparation of the alkali solution in the first alkali preparation container, and at the same time, the concentration detection device is used to monitor the concentration of the circulating liquid in real time and timely feedback to the control device, and then the flow detection device is combined to accurately control the amount of alkali solution and pure water added, so that the alkali solution concentration can be obtained without stopping the machine during the automatic alkali preparation process, and the prepared alkali solution concentration is guaranteed to be accurate. The problem of inaccurate alkali solution concentration control, complex operation and time-consuming in the alkali preparation process of the existing alkali preparation device is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of the automatic alkali preparation system disclosed in the embodiment of the present disclosure.

[0026] Description of reference numerals:

[0027] 1. First alkali preparation container; 2. First valve; 3. Second valve; 4. First flow detection device; 5. Second flow detection device; 6. First circulation pipeline; 7. Concentration detection device; 8. First drive device; 9. Second alkali preparation container; 10. Third valve; 11. Fourth valve; 12. Stirring device; 13. Second drive device; 14. Electrolysis device; 15. Cooling device; 16. Hydrogen liquid tank; 17. Oxygen liquid tank; 18. Third drive device; 19. Second circulation pipeline; 20. Third circulation pipeline; 21. Fifth valve; 22. Exhaust valve; 23. Drain valve. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0029] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0030] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0031] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0032] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0033] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0034] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0035] Example 1

[0036] In order to solve the problems existing in the prior art, the embodiments of the present disclosure provide an automatic alkali preparation system, such as Figure 1As shown, it comprises: a first alkali preparation container 1, the first alkali preparation container 1 has a first liquid inlet and a second liquid inlet, the first liquid inlet is used to introduce alkali solution, the second liquid inlet is used to introduce pure water, the first liquid inlet is provided with a first valve 2, the second liquid inlet is provided with a second valve 3, the first valve 2 and the second valve 3 are respectively used to control the on-off of the first liquid inlet and the second liquid inlet; a first flow detection device 4 is provided at the first liquid inlet, and a second flow detection device 5 is provided at the second liquid inlet, the first flow detection device 4 is used to calculate the amount of alkali solution introduced, and the second flow detection device 5 is used to calculate the amount of pure water introduced, the first alkali preparation container 1 is also provided with a plurality of liquid level scales, a first circulation pipeline 6, and the two ends of the first circulation pipeline 6 are respectively connected to the first preparation container 1. The first alkali preparation container 1 is connected, and the liquid in the first alkali preparation container 1 circulates in the first circulation pipeline 6 and the first alkali preparation container 1 through the first driving device 8. The first circulation pipeline 6 is provided with a concentration detection device 7 for detecting the concentration of the liquid flowing through the first circulation pipeline 6; and a control device, which is respectively communicated with the first valve 2, the second valve 3, the first flow detection device 4, the second flow detection device 5, the first driving device 8 and the concentration detection device 7; wherein the control device controls the opening and closing of the first valve 2, the second valve 3 and the first driving device 8 according to the detection signals of the concentration detection device 7, the first flow detection device 4 and the second flow detection device 5, and the liquid level height in the first alkali preparation container 1.

[0037] The first alkali preparation container 1 can be a square or cylindrical structure, with corrosion resistance to adapt to the alkali liquid environment, and is provided with a first liquid inlet and a second liquid inlet, respectively used to introduce alkali liquid and pure water, and the first valve 2 and the second valve 3 are respectively installed at the liquid inlet to control the liquid inflow. The first flow detection device 4 and the second flow detection device 5 are respectively installed behind the liquid inlet, which are used to accurately measure the volume of alkali liquid and pure water entering the container. The outer wall of the first alkali preparation container 1 is provided with a plurality of liquid level scales, and the liquid level height in the container can be observed and recorded in real time. The first circulation pipeline 6 is connected to the first alkali preparation container 1 at both ends to form a closed loop, and the first drive device 8 (such as a pump) is installed on the pipeline to drive the liquid in the container to circulate between the pipeline and the container, and the concentration detection device 7 is also installed on the pipeline for real-time monitoring of the alkali concentration in the circulating liquid. The control device (programmable logic controller or industrial computer, etc.) is respectively connected to the first valve 2, the second valve 3, the first flow detection device 4, the second flow detection device 5, the first drive device 8 and the concentration detection device 7. Through the control device, the automatic alkali preparation system can automatically adjust the opening and closing of the first valve 2 and the second valve 3 and the start and stop of the first driving device 8 according to the set concentration requirements, so as to realize automatic preparation of alkali solution. At the same time, the concentration detection device 7 is used to monitor the concentration of the circulating liquid in real time and timely feedback to the control device, and the addition amount of alkali solution and pure water is accurately controlled in combination with the flow detection device, so that the concentration of alkali solution can be obtained without stopping the machine during the automatic alkali preparation process, and the concentration of the prepared alkali solution is accurate.

[0038] In some embodiments, the automatic alkali preparation system also includes: a liquid level sensor, which is arranged on the first alkali preparation container 1 and is used to detect the liquid level height in the first alkali preparation container 1, and the control device is communicatively connected with the liquid level sensor; the liquid level scale includes a first scale, a second scale, a third scale and a fourth scale arranged in sequence from bottom to top along the vertical direction.

[0039] A liquid level sensor is installed at an appropriate position of the first alkali preparation container 1, which can detect the liquid level height in the container in a non-contact or contact manner, such as an ultrasonic liquid level sensor, a capacitive liquid level sensor, a float type liquid level sensor, etc. On the side of the first alkali preparation container 1, a first scale, a second scale, a third scale and a fourth scale are arranged in sequence from bottom to top in the vertical direction, which can be an intuitive ruler or digital display. The liquid level sensor is arranged at the position of each scale corresponding to the liquid level sensor, and the liquid level sensor is connected to the control device for communication to ensure that the detection data can be transmitted to the control device in real time. The control logic can be preset in the control device. When the liquid level height detected by the liquid level sensor reaches or exceeds the preset scale, the control device will automatically adjust the opening and closing of the first valve 2 and the second valve 3 and the start and stop of the first drive device 8 to maintain the liquid level within a safe range.

[0040] Through real-time monitoring of the liquid level sensor, the control device can timely adjust the inflow and circulation of the liquid to prevent the liquid in the container from overflowing or the pump from being emptied. The data provided by the liquid level sensor helps the control device to more accurately control the liquid ratio and circulation, and improve the accuracy of alkali solution preparation. The combination of liquid level sensor and control device makes the automatic alkali preparation system more intelligent, can automatically adapt to different working conditions, and reduce human errors.

[0041] In some embodiments, the liquid level sensor may be a light-sensitive liquid level meter, which has the characteristic of being able to adjust the positions and intervals of four liquid level scales by itself. The specific positions of the first scale, the second scale, the third scale, and the fourth scale may be flexibly set according to actual needs, and the interval range between each scale may be adjusted. This allows liquid level monitoring to be more adaptable to different working scenarios and requirements, and can better meet the accuracy and flexibility requirements of the automatic alkali preparation system for liquid level control.

[0042] In some embodiments, the first alkali preparation container 1 is provided with a drain port at the bottom along the vertical direction, and a drain valve 23 is provided at the drain port; the control device is electrically connected to the drain valve 23, and the control device controls the opening and closing of the drain valve 23 according to the detection signal of the liquid level sensor.

[0043] A drain port is provided at the bottom of the first alkali preparation container 1 for discharging the liquid in the container, and a drain valve 23 is installed at the drain port to control the liquid discharge process. The drain valve 23 is electrically connected to the control device so that the control device can control its opening and closing according to program instructions. The control logic is preset in the control device. When the liquid level sensor detects that the liquid level in the container reaches the set maximum liquid level threshold, the control device automatically sends a signal to open the drain valve 23 to lower the liquid level; when the liquid level drops below the set safety level, the control device closes the drain valve 23.

[0044] Through the automatic control of the drain valve 23, the system can effectively prevent overflow caused by excessive liquid level and ensure workplace safety. At the same time, the automatic control of the drain valve 23 makes liquid level management more automated, reduces manual intervention, and improves the automation level of the system.

[0045] In some embodiments, the automatic alkali preparation system also includes: a second alkali preparation container 9, the second alkali preparation container 9 has a third liquid inlet and a fourth liquid inlet, the third liquid inlet is used to introduce alkali liquid raw material, the fourth liquid inlet is used to introduce pure water, the third liquid inlet is provided with a third valve 10, the fourth liquid inlet is provided with a fourth valve 11, the third valve 10 and the fourth valve 11 are respectively used to control the opening and closing of the third liquid inlet and the fourth liquid inlet; the liquid outlet of the second alkali preparation container 9 is connected to the first liquid inlet of the first alkali preparation container 1, and the liquid in the second alkali preparation container 9 enters the first alkali preparation container 1 through the second driving device 13.

[0046] The second alkali preparation container 9 can be a square or cylindrical structure with certain corrosion resistance, and a third liquid inlet and a fourth liquid inlet are arranged thereon, which are used to introduce alkali liquid raw materials and pure water respectively, and a third valve 10 and a fourth valve 11 are respectively installed at the two liquid inlets to control their inflow. The liquid outlet of the second alkali preparation container 9 is connected to the first liquid inlet of the first alkali preparation container 1 through a pipeline to ensure that the liquid can flow from the second alkali preparation container 9 into the first alkali preparation container 1. A second driving device 13 (such as a pump or a pneumatic device) is installed on the second alkali preparation container 9 to push the liquid inside it into the first alkali preparation container 1.

[0047] The control logic can be preset in the control device, and the opening and closing of the third valve 10, the fourth valve 11 and the second drive device 13 can be controlled according to the parameters such as the liquid level height and concentration requirements in the first alkali preparation container 1, so as to achieve the accurate proportioning and delivery of the alkali liquid raw material and the pure water. Specifically, the control device opens the third valve 10 and the fourth valve 11 according to the liquid level and concentration requirements in the first alkali preparation container 1, so that the alkali liquid raw material and the pure water flow into the second alkali preparation container 9 in proportion. When the liquid in the second alkali preparation container 9 reaches the predetermined proportion, the control device starts the second drive device 13 to push the liquid into the first alkali preparation container 1. If the liquid in the first alkali preparation container 1 needs to be further adjusted after circulation and concentration detection, the control device will adjust the liquid proportioning and delivery in the second alkali preparation container 9 again.

[0048] By setting up the second alkali preparation container 9, the alkali solution raw material and pure water can be initially proportioned, and then enter the first alkali preparation container 1 for final accurate proportioning, thereby improving the flexibility and accuracy of the proportioning. By means of the joint control of the second alkali preparation container 9 and the first alkali preparation container 1 by the control device, the automation of the entire alkali preparation process can be realized more conveniently.

[0049] In some embodiments, a stirring device 12 is provided in the second alkali preparation container 9 , and the stirring device 12 is used to stir the liquid in the second alkali preparation container 9 .

[0050] Agitating device 12 is installed inside the second alkali preparation container 9, such as a rotating paddle stirrer, a turbine stirrer, a magnetic stirrer, etc., which are suitable for stirring the liquid. Agitating device 12 can be connected with a driving source (such as an electric motor or an air motor) to provide stirring power. The driving source of agitating device 12 is electrically connected to the control device so that agitating device 12 can be started or stopped according to the control device instruction. The stirring control logic is preset in the control device, and the operating speed and time of agitating device 12 can be adjusted according to factors such as the proportioning requirement of the liquid, the mixing uniformity, etc.

[0051] When the alkali liquid raw material and pure water enter the second alkali preparation container 9 through the third valve 10 and the fourth valve 11, the control device starts the stirring device 12, which works according to the preset program to ensure that the alkali liquid raw material and pure water are fully mixed in the container. After the mixing is completed, the control device stops the stirring device 12 and starts the second driving device 13 to send the mixed liquid into the first alkali preparation container 1. During the entire alkali preparation process, the stirring device 12 can be started intermittently as needed to ensure the uniformity of liquid mixing. The stirring device 12 can ensure that the alkali liquid raw material and pure water are fully mixed in the second alkali preparation container 9 to improve the uniformity of the mixed liquid. The uniform mixed liquid helps to achieve a more accurate final ratio in the first alkali preparation container 1 and optimize the ratio effect.

[0052] In some embodiments, the automatic alkali preparation system also includes: an electrolysis device 14, the first alkali preparation container 1 is connected to the liquid inlet of the electrolysis device 14, the liquid in the first alkali preparation container 1 enters the electrolysis device 14 through the third driving device 18, and is electrolyzed in the electrolysis device 14; a cooling device 15, the cooling device 15 is connected to the liquid outlet of the electrolysis device 14, and the liquid electrolyzed in the electrolysis device 14 can enter the cooling device 15 for cooling and separation; a second circulation pipeline 19, the cooling device 15 is connected to the first alkali preparation container 1 through the second circulation pipeline 19, and the liquid cooled by the cooling device 15 can enter the first alkali preparation container 1 through the second circulation pipeline 19.

[0053] An electrolysis device 14 is added to the automatic alkali preparation system, and the liquid inlet of the device is connected to the first alkali preparation container 1. The electrolysis device 14 uses water electrolysis hydrogen production technology to use alkali solution as an electrolyte to improve the conductivity of water. A third drive device 18 (such as a pump) is installed on the pipeline between the first alkali preparation container 1 and the electrolysis device 14, which is used to push the alkali solution in the first alkali preparation container 1 to the electrolysis device 14. A cooling device 15 is connected to the liquid outlet of the electrolysis device 14, which cools and separates the liquid after electrolysis to obtain hydrogen, oxygen and alkali solution with a high concentration. The cooling device 15 is connected to the first alkali preparation container 1 through the second circulation pipeline 19, so that the cooled high-concentration alkali solution can return to the first alkali preparation container 1, and the alkali preparation operation is performed again, and hydrogen enters the hydrogen liquid tank 16 and oxygen enters the oxygen liquid tank 17. When the alkali solution in the first alkali preparation container 1 reaches a predetermined concentration, the control device starts the third drive device 18 to transport the alkali solution to the electrolysis device 14 for electrolysis. The gas and liquid produced after electrolysis flow into the cooling device 15 through the pipeline, and the cooling device 15 cools the liquid after electrolysis to reduce its temperature and may perform a separation operation. Subsequently, the cooled high-concentration alkali solution returns to the first alkali preparation container 1 through the second circulation pipeline 19.

[0054] After being processed by the cooling device 15, the alkali solution with a higher concentration can be returned to the first alkali preparation container 1 to perform the alkali preparation operation again. This realizes the recycling of the alkali solution, reduces the waste of resources, and thus reduces the production cost. Even if the concentration of the recycled alkali solution is unknown, the concentration of the required alkali solution can still be accurately prepared with the help of the first circulation pipeline 6 and the concentration detection device 7.

[0055] In some embodiments, the automatic alkali preparation system also includes: a third circulation pipeline 20, both ends of the third circulation pipeline 20 are respectively connected to the first circulation pipeline 6, and the position of the liquid inlet of the third circulation pipeline 20 on the first circulation pipeline 6 is far away from the first alkali preparation container 1 relative to the first driving device 8; the concentration detection device 7 is arranged on the third circulation pipeline 20, and a fifth valve 21 is provided on both ends of the concentration detection device 7 on the third circulation pipeline 20.

[0056] A third circulation pipeline 20 is provided in the automatic alkali preparation system, and its two ends are respectively connected with the first circulation pipeline 6. The liquid inlet of the third circulation pipeline 20 is located on the first circulation pipeline 6 and is far away from the first alkali preparation container 1 relative to the first driving device 8, so as to ensure that the liquid flowing out of the first alkali preparation container 1 flows through a certain distance before entering the third circulation pipeline 20, so as to guide the liquid to be detected to the pipeline for concentration detection without affecting the normal liquid circulation of the first circulation pipeline 6. A concentration detection device 7 is installed on the third circulation pipeline 20 to detect the concentration of the liquid flowing through, and its position should accurately reflect the actual concentration of the liquid in the first alkali preparation container 1. Fifth valves 21 are provided at both ends of the concentration detection device 7, and these valves can control the flow of the liquid in the third circulation pipeline 20. When the concentration detection is required, the valves are opened to allow the liquid to flow in for detection. After the detection is completed, the valves are closed to allow the liquid to continue to circulate in the first circulation pipeline 6, and the valves at both ends can make the liquid stay in the third circulation pipeline 20, so as to improve the detection result of the concentration detection device 7.

[0057] When the liquid in the first alkali preparation container 1 circulates through the first drive device 8, part of the liquid is introduced into the third circulation pipeline 20, and the concentration is detected by the concentration detection device 7 when flowing through the pipeline. According to the detection result, the control device can adjust the opening and closing of the first valve 2, the second valve 3 and the operation of the first drive device 8 to adjust the liquid concentration. If the concentration detection device 7 needs to be maintained or calibrated, the fifth valve 21 can be closed to isolate the third circulation pipeline 20 for operation. The design of the third circulation pipeline 20 enables the concentration detection to be completed in a relatively independent environment, reduces the interference of the main circulation pipeline, and improves the reliability of the detection.

[0058] In some embodiments, the first alkali preparation container 1 is provided with an exhaust port at the top along the vertical direction, and an exhaust valve 22 is provided at the exhaust port, and the exhaust valve 22 is used to control the opening and closing of the exhaust port.

[0059] An exhaust port is arranged at the top of the first alkali preparation container 1, which is used to discharge the gas generated by the flow of liquid in the container or the gas generated by the temperature rise caused by the alkali preparation process, so as to prevent the pressure in the container from being too high. An exhaust valve 22 is installed at the exhaust port to control the opening and closing of the exhaust port to adjust the exchange of gas inside and outside the container. The exhaust valve 22 can be manually operated or connected to the control device to realize automatic control. In the automatic control mode, the control device adjusts the opening and closing of the exhaust valve 22 according to the pressure sensor signal or other relevant parameters in the container. When the liquid in the first alkali preparation container 1 is pumped or gas is generated due to temperature rise, the control device detects the pressure change. According to the preset pressure threshold, the control device automatically opens the exhaust valve 22, allowing the gas to be discharged from the exhaust port to reduce the pressure in the container. Once the pressure in the container drops to a safe range, the control device closes the exhaust valve 22 to maintain the stability of the liquid in the container and prevent external impurities from entering.

[0060] Example 2

[0061] Embodiment 2 of the present disclosure provides a alkali preparation method, which is applied to the automatic alkali preparation system provided in Embodiment 1, comprising:

[0062] S1: setting four liquid level heights in the first alkali preparation container 1 from bottom to top in the vertical direction, namely the first scale, the second scale, the third scale and the fourth scale;

[0063] S2: adding a first alkali solution into the first alkali preparation container 1, and when it is detected that the liquid level reaches a second scale, adding pure water into the first alkali preparation container 1, and when it is detected that the liquid level reaches a third scale, starting the first driving device 8, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 for a first preset time;

[0064] S3: Detecting the concentration of the liquid in the first circulation pipeline 6. If the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, the concentration of the alkali solution or the amount of pure water required to be put into the first alkali preparation container 1 is calculated according to the detection information, and the first alkali solution or pure water is added to the first alkali preparation container 1 according to the calculation result, and the first driving device 8 is started again, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 again for a second preset time, and the concentration of the liquid in the first circulation pipeline 6 is detected again;

[0065] S4: when it is detected that the liquid level of the first alkali preparation container 1 reaches the fourth scale, the drain valves at the bottom of the first alkali preparation container 1 are controlled to open until the liquid in the first alkali preparation container 1 is discharged to the third scale;

[0066] S5: starting the first driving device 8, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 for a third preset time, and detecting the concentration of the liquid in the first circulation pipeline 6. If the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, repeating step S3 until an alkali solution with a preset concentration value is obtained;

[0067] S6: delivering the alkali solution with a preset concentration value in the first alkali preparation container 1 to the electrolysis device 14. When it is detected that the liquid level of the first alkali preparation container 1 reaches a first scale, repeating steps S2 to S4.

[0068] Step S1, in the first alkali preparation container 1, four liquid level heights are set in sequence from bottom to top in the vertical direction, namely the first scale, the second scale, the third scale and the fourth scale.

[0069] The four liquid level heights can be determined by installing a scale with a scale on the outer wall of the first alkali preparation container 1, or by using a liquid level sensor and setting the corresponding liquid level value in the control device. By clarifying the liquid level reference standards at different stages, a specific control target is provided for the subsequent alkali preparation operation. In the alkali preparation process, corresponding operations can be performed according to different liquid level conditions, thereby improving the accuracy and controllability of alkali preparation.

[0070] Step S2, adding the first alkali solution into the first alkali preparation container 1, when it is detected that the liquid level reaches the second scale, adding pure water into the first alkali preparation container 1, when it is detected that the liquid level reaches the third scale, starting the first driving device 8, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 for a first preset time.

[0071] First, the first alkali solution is dropped into the first alkali preparation container 1, and the liquid level change is monitored in real time by a liquid level sensor or other liquid level detection devices. When it is detected that the liquid level reaches the second scale, the pure water injection channel is opened, and pure water is dropped into the container. Continue to monitor the liquid level, and when the third scale is reached, start the first drive device 8, such as a pump, so that the liquid in the container circulates between the first circulation pipeline 6 and the first alkali preparation container 1, and continues the first preset time, for example, 20 minutes. By dropping alkali solution and pure water in stages, it is conducive to accurately control the ratio of alkali solution and pure water. Liquid circulates after reaching the third scale, and can promote the mixing of alkali solution and pure water, so that both are more evenly distributed in the container, and lays the foundation for subsequent accurate alkali preparation.

[0072] Step S3, detecting the concentration of the liquid in the first circulation pipeline 6. If the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, the alkali solution concentration or the amount of pure water required to be put into the first alkali preparation container 1 is calculated according to the detection information, and the first alkali solution or pure water is added to the first alkali preparation container 1 according to the calculation result, and the first driving device 8 is started again, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 again for the second preset time, and the concentration of the liquid in the first circulation pipeline 6 is detected again.

[0073] The concentration of the liquid is detected by the concentration detection device 7 installed on the first circulation pipeline 6. If the detected concentration value is within the deviation range of the preset concentration value, the deviation range can be ±0.5%, indicating that the alkali preparation is completed. If the concentration value is higher or lower than the deviation range, the amount of alkali solution or pure water to be added is calculated according to the detection information and the preset algorithm. Then, the corresponding first alkali solution or pure water is added to the first alkali preparation container 1, and the first driving device 8 is started again. After the liquid circulates in the first circulation pipeline 6 for the second preset time, for example, 20 minutes, the liquid concentration is detected again. By real-time monitoring of the concentration and adjusting it, the accuracy of the alkali preparation is ensured. By calculating the addition of suitable alkali solution or pure water and circulating it again, the preset concentration value can be gradually approached, thereby improving the accuracy and reliability of the alkali preparation.

[0074] Step S4, when it is detected that the liquid level of the first alkali preparation container 1 reaches the fourth scale, the drain valves at the bottom of the first alkali preparation container 1 are controlled to open until the liquid in the first alkali preparation container 1 is discharged to the third scale.

[0075] The liquid level of the first alkali preparation container 1 is continuously monitored. When the liquid level reaches the fourth scale, the control device issues a command to open the drain valve 23 at the bottom of the container to allow the liquid to be discharged. At the same time, the liquid level change is monitored by the liquid level detection device. When the liquid level drops to the third scale, the drain valve 23 is closed to prevent safety problems such as overflow caused by excessive liquid level. By discharging the liquid in time and controlling it at an appropriate liquid level, the safe and stable operation of the alkali preparation system is ensured, and appropriate liquid level conditions are provided for subsequent operations.

[0076] Step S5, start the first driving device 8, so that the liquid in the first alkali preparation container 1 circulates through the first circulation pipeline 6 for a third preset time, and detects the concentration of the liquid in the first circulation pipeline 6. If the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, repeat step S3 until an alkali solution with a preset concentration value is obtained.

[0077] Start the first driving device 8, and let the liquid in the container circulate in the first circulation pipeline 6 for a third preset time, for example, 20 minutes. Then use the concentration detection device 7 to detect the liquid concentration again. If the concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if it is not within the deviation range, repeat the operation of step S3, that is, calculate the amount of alkali solution or pure water to be added, add the corresponding substance, circulate again and detect the concentration. By recirculating and detecting again, the accuracy of alkali preparation is further ensured. When concentration deviation occurs, it can be adjusted in time, and the alkali preparation process is continuously optimized until the alkali solution with the preset concentration value that meets the requirements is obtained.

[0078] S6: delivering the alkali solution with a preset concentration value in the first alkali preparation container 1 to the electrolysis device 14. When it is detected that the liquid level of the first alkali preparation container 1 reaches a first scale, repeating steps S2 to S4.

[0079] After the alkali preparation is completed, the alkali solution with a preset concentration value in the first alkali preparation container 1 is transported to the electrolysis device 14 for subsequent treatment. At the same time, the liquid level of the first alkali preparation container 1 continues to be monitored. When the liquid level reaches the first scale, steps S2 to S4 are restarted to perform the next round of alkali preparation operation. The continuous production and supply of alkali solution can be achieved. By automatically starting a new round of alkali preparation operation when the liquid level reaches a specific value, the production efficiency is improved and the continuous production demand is met.

[0080] The alkali preparation method provided in the embodiment of the present disclosure can accurately prepare alkali solution with a preset concentration value through multiple concentration detection and adjustment to meet different process requirements. The entire alkali preparation process is automatically controlled by the automatic alkali preparation system, which reduces manual intervention and improves production efficiency and accuracy of alkali preparation.

[0081] In some embodiments, step S2 of adding the first alkali solution into the first alkali preparation container 1 comprises:

[0082] First, alkali solution raw materials and pure water are added into the second alkali preparation container 9 to obtain the first alkali solution, and then the obtained first alkali solution is transported to the first alkali preparation container 1 through the second driving device 13; the concentration value of the first alkali solution is greater than the preset concentration value.

[0083] Alkali liquid raw material and pure water are added to the second alkali preparation container 9, and this process can realize the introduction of alkali liquid raw material and pure water respectively by controlling the third valve 10 and the fourth valve 11. In the second alkali preparation container 9, the alkali liquid raw material and pure water are mixed by means of a stirring device 12, so as to obtain a first-level alkali liquid, i.e., the first alkali liquid, and the concentration value of the first alkali liquid is set to be greater than the final preset concentration value, so that the preset concentration can be accurately reached in subsequent mixing. After the mixing is completed, the second driving device 13 (such as a pump) is started, and the first alkali liquid in the second alkali preparation container 9 is transported to the first alkali preparation container 1 through a pipeline, and this process can accurately control the amount of the first alkali liquid added to the first alkali preparation container 1 by controlling the start and stop and flow of the second driving device 13.

[0084] By firstly preparing the alkali in the second alkali preparation container 9 to obtain the first alkali solution, and then transporting it to the first alkali preparation container 1 for accurate mixing, the process of preparing the alkali in stages is realized. This method makes the alkali preparation process more orderly and controllable, and improves the accuracy and stability of the alkali preparation. In addition, the existence of the second alkali preparation container 9 can be used as an intermediate buffer link, and the alkali solution is prepared and transported according to the needs of the first alkali preparation container 1, avoiding the waste that may be caused by directly adding a large amount of alkali solution raw materials and pure water to the first alkali preparation container 1.

[0085] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0086] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. An automatic alkali preparation system, characterized in that: include: A first alkali preparation container (1), the first alkali preparation container (1) having a first liquid inlet and a second liquid inlet, the first liquid inlet being used to introduce alkali solution, the second liquid inlet being used to introduce pure water, the first liquid inlet being provided with a first valve (2), the second liquid inlet being provided with a second valve (3), the first valve (2) and the second valve (3) being used to control the opening and closing of the first liquid inlet and the second liquid inlet respectively; The first liquid inlet is provided with a first flow detection device (4), and the second liquid inlet is provided with a second flow detection device (5); the first flow detection device (4) is used to calculate the amount of introduced alkali solution, and the second flow detection device (5) is used to calculate the amount of introduced pure water; the first alkali preparation container (1) is also provided with a plurality of liquid level scales; a first circulation pipeline (6), wherein both ends of the first circulation pipeline (6) are respectively connected to the first alkali preparation container (1), the liquid in the first alkali preparation container (1) circulates in the first circulation pipeline (6) and the first alkali preparation container (1) via a first driving device (8), and the first circulation pipeline (6) is provided with a concentration detection device (7) for detecting the concentration of the liquid flowing through the first circulation pipeline (6); and a control device, wherein the control device is respectively connected to the first valve (2), the second valve (3), the first flow detection device (4), the second flow detection device (5), the first drive device (8) and the concentration detection device (7); The control device controls the opening and closing of the first valve (2), the second valve (3) and the first driving device (8) according to the detection signals of the concentration detection device (7), the first flow detection device (4) and the second flow detection device (5), and the liquid level in the first alkali preparation container (1).

2. The automatic alkali preparation system according to claim 1, characterized in that: Also includes: a liquid level sensor, the liquid level sensor being arranged on the first alkali preparation container (1) and being used for detecting the liquid level height in the first alkali preparation container (1), the control device being in communication connection with the liquid level sensor; The liquid level scale includes a first scale, a second scale, a third scale and a fourth scale which are arranged in sequence from bottom to top along the vertical direction.

3. The automatic alkali preparation system according to claim 2, characterized in that: The first alkali preparation container (1) is provided with a drain port at the bottom along the vertical direction, and a drain valve (23) is provided at the drain port; The control device is electrically connected to the liquid discharge valve (23), and the control device controls the opening and closing of the liquid discharge valve (23) according to the detection signal of the liquid level sensor.

4. The automatic alkali preparation system according to claim 1, characterized in that: Also includes: A second alkali preparation container (9), wherein the second alkali preparation container (9) has a third liquid inlet and a fourth liquid inlet, wherein the third liquid inlet is used to introduce alkali liquid raw materials, and the fourth liquid inlet is used to introduce pure water, wherein a third valve (10) is provided at the third liquid inlet, and a fourth valve (11) is provided at the fourth liquid inlet, wherein the third valve (10) and the fourth valve (11) are used to control the opening and closing of the third liquid inlet and the fourth liquid inlet respectively; The liquid outlet of the second alkali preparation container (9) is communicated with the first liquid inlet of the first alkali preparation container (1), and the liquid in the second alkali preparation container (9) enters the first alkali preparation container (1) through the second driving device (13).

5. The automatic alkali preparation system according to claim 4, characterized in that: The second alkali preparation container (9) is provided with a stirring device (12), and the stirring device (12) is used to stir the liquid in the second alkali preparation container (9).

6. The automatic alkali preparation system according to claim 1, characterized in that: Also includes: An electrolysis device (14), wherein the first alkali preparation container (1) is connected to a liquid inlet of the electrolysis device (14), and liquid in the first alkali preparation container (1) enters the electrolysis device (14) through a third driving device (18) and is electrolyzed in the electrolysis device (14); A cooling device (15), wherein the cooling device (15) is in communication with a liquid outlet of the electrolysis device (14), and liquid electrolyzed in the electrolysis device (14) can enter the cooling device (15) for cooling and separation; A second circulation pipeline (19), wherein the cooling device (15) is connected to the first alkali preparation container (1) via the second circulation pipeline (19), and the liquid cooled by the cooling device (15) can enter the first alkali preparation container (1) via the second circulation pipeline (19).

7. The automatic alkali preparation system according to claim 1, characterized in that: Also includes: a third circulation pipeline (20), wherein both ends of the third circulation pipeline (20) are respectively connected to the first circulation pipeline (6), and a liquid inlet of the third circulation pipeline (20) is located on the first circulation pipeline (6) at a position far from the first alkali preparation container (1) relative to the first driving device (8); The concentration detection device (7) is arranged on the third circulation pipeline (20), and fifth valves (21) are arranged on both ends of the concentration detection device (7) on the third circulation pipeline (20).

8. The automatic alkali preparation system according to claim 1, characterized in that: The first alkali preparation container (1) is provided with an exhaust port at the top in the vertical direction, and an exhaust valve (22) is provided at the exhaust port, and the exhaust valve (22) is used to control the opening and closing of the exhaust port.

9. A alkali preparation method, according to the automatic alkali preparation system according to any one of claims 1 to 8, characterized in that: include: S1: setting four liquid level heights in the first alkali preparation container (1) in sequence from bottom to top along the vertical direction, namely a first scale, a second scale, a third scale and a fourth scale; S2: adding a first alkali solution into the first alkali preparation container (1), and when it is detected that the liquid level reaches the second scale mark, adding pure water into the first alkali preparation container (1), and when it is detected that the liquid level reaches the third scale mark, starting a first driving device (8) to cause the liquid in the first alkali preparation container (1) to circulate through a first circulation pipeline (6) for a first preset time; S3: detecting the concentration of the liquid in the first circulation pipeline (6); if the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, calculating the concentration of the alkali solution or the amount of pure water required to be added to the first alkali preparation container (1) according to the detection information, adding the first alkali solution or pure water to the first alkali preparation container (1) according to the calculation result, and restarting the first driving device (8) to make the liquid in the first alkali preparation container (1) circulate again through the first circulation pipeline (6) for a second preset time, and detecting the concentration of the liquid in the first circulation pipeline (6) again; S4: when it is detected that the liquid level of the first alkali preparation container (1) reaches the fourth scale mark, the drain valves at the bottom of the first alkali preparation container (1) are controlled to open until the liquid in the first alkali preparation container (1) is discharged to the third scale mark; S5: starting the first driving device (8) to allow the liquid in the first alkali preparation container (1) to circulate through the first circulation pipeline (6) for a third preset time, detecting the concentration of the liquid in the first circulation pipeline (6), and if the detected concentration value is within the deviation range of the preset concentration value, the alkali preparation is completed; if the detected concentration value is higher or lower than the deviation range of the preset concentration value, repeating step S3 until an alkali solution with the preset concentration value is obtained; S6: delivering the alkali solution with the preset concentration value in the first alkali preparation container (1) to the electrolysis device (14); and when it is detected that the liquid level of the first alkali preparation container (1) reaches a first scale mark, repeating steps S2 to S4.

10. The alkali preparation method according to claim 9, characterized in that: The step S2 of adding the first alkali solution into the first alkali preparation container (1) comprises: Firstly, an alkali solution raw material and pure water are added into a second alkali preparation container (9) to obtain the first alkali solution, and then the first alkali solution is transported into the first alkali preparation container (1) through a second driving device (13); The concentration value of the first alkali solution is greater than the preset concentration value.

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