Electrolytic cell current equalization control system and method

Abstract

The present invention relates to the field of electrolysis technology, and provides an electrolytic cell flow control system and method. The electrolytic cell flow control system comprises: an electrolytic cell, a liquid inlet main pipe, an oxygen liquid outlet main pipe, a hydrogen liquid outlet main pipe and a controller. The electrolytic cell comprises a plurality of electrolytic chamber units; the liquid inlet main pipe is connected to the electrolytic chamber unit via a liquid inlet branch pipe, and the liquid inlet branch pipe is provided with a liquid inlet regulating valve; the oxygen liquid outlet main pipe is connected to the electrolytic chamber unit via an oxygen liquid outlet branch pipe, and the oxygen liquid outlet branch pipe is provided with an oxygen liquid outlet regulating valve; the hydrogen liquid outlet main pipe is connected to the electrolytic chamber unit via a hydrogen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe is provided with a hydrogen liquid outlet regulating valve; the controller is electrically connected to the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve respectively. The present invention realizes group flow control of the electrolytic chamber, can simplify the system structure and optimize the control, ensure the uniformity and consistency of the flow distribution of each group of electrolytic chambers, and thus ensure the uniform heat dissipation of the electrolytic cell.

Description

Technical Field

[0001] The present invention relates to the field of electrolysis technology, and in particular to an electrolytic cell current equalization control system and method. Background Art

[0002] At present, for electrolytic cells with larger volumes, the total length is often also longer. Long electrolytic cells easily cause the circulating alkali solution to not be evenly distributed to each electrolytic chamber, resulting in uneven alkali solution flow in each electrolytic chamber. At the same time, due to the different degree of deformation of each electrolytic chamber during the sealing extrusion deformation process, there is always a gap between the actual flow rate and the ideal flow rate of each electrolytic chamber, resulting in uneven voltage and temperature in the electrolytic chamber and poor heat dissipation effect of the electrolytic cell. Summary of the invention

[0003] The present invention provides an electrolytic cell flow control system and method, which are used to solve the defect of uneven flow distribution in electrolytic chambers in the related art, realize group flow control of electrolytic chambers, simplify the system structure and optimize the control, ensure the uniformity and consistency of flow distribution in each group of electrolytic chambers, and thus ensure uniform heat dissipation of the electrolytic cell.

[0004] The present invention provides an electrolytic cell current sharing control system, comprising:

[0005] An electrolytic cell, comprising a plurality of electrolytic chamber units;

[0006] A liquid inlet main pipe is connected to the electrolysis chamber unit via a liquid inlet branch pipe, and the liquid inlet branch pipe is provided with a liquid inlet regulating valve for regulating the liquid inlet amount of the electrolysis chamber unit;

[0007] An oxygen liquid outlet main pipe is connected to the electrolysis chamber unit via an oxygen liquid outlet branch pipe, and the oxygen liquid outlet branch pipe is provided with an oxygen liquid outlet regulating valve for regulating the oxygen liquid outlet amount of the electrolysis chamber unit;

[0008] A hydrogen liquid outlet main pipe is connected to the electrolysis chamber unit via a hydrogen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe is provided with a hydrogen liquid outlet regulating valve for regulating the hydrogen liquid outlet amount of the electrolysis chamber unit;

[0009] The controller is electrically connected to the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve, respectively, and is used to control the opening of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve according to the difference in liquid inlet and outlet flow of the electrolysis chamber unit.

[0010] According to the present invention, an electrolytic cell current balancing control system further includes:

[0011] A variable frequency circulation pump is arranged between the liquid inlet main pipe and the oxygen liquid outlet main pipe and the hydrogen liquid outlet main pipe, and is electrically connected to the controller;

[0012] A power detector is electrically connected to the electrolysis chamber unit and the controller, respectively, and the power detector is used to detect the operating power of the electrolysis chamber unit. The controller is also used to control the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve, as well as the operating power of the variable frequency circulation pump according to the detected operating power of the electrolysis chamber unit.

[0013] According to the present invention, an electrolytic cell current balancing control system further includes:

[0014] A gas-liquid separator, wherein the inlet of the gas-liquid separator is respectively connected to the oxygen liquid outlet main pipe and the hydrogen liquid outlet main pipe, and the liquid outlet of the gas-liquid separator is connected to the variable frequency circulation pump;

[0015] The heat exchanger is connected between the variable frequency circulation pump and the liquid inlet main pipe.

[0016] According to an electrolytic cell flow equalization control system provided by the present invention, the liquid inlet branch pipe is provided with a liquid inlet flowmeter, the oxygen liquid outlet branch pipe is provided with an oxygen liquid outlet flowmeter, the hydrogen liquid outlet branch pipe is provided with a hydrogen liquid outlet flowmeter, and the liquid inlet flowmeter, the oxygen liquid outlet flowmeter and the hydrogen liquid outlet flowmeter are electrically connected to the controller respectively.

[0017] According to an electrolytic cell current equalization control system provided by the present invention, the electrolytic chamber unit comprises: a plurality of electrolytic chambers, and the electrolytic chambers are formed by a plurality of bipolar plates arranged and distributed at intervals.

[0018] According to an electrolytic cell flow equalization control system provided by the present invention, the bipolar plate is provided with a liquid inlet through hole, an oxygen liquid outlet through hole and a hydrogen liquid outlet through hole which are connected to the electrolysis chamber, the liquid inlet through hole is connected to the liquid inlet branch pipe via a first special joint, the oxygen liquid outlet through hole is connected to the oxygen liquid outlet branch pipe via a second special joint, and the hydrogen liquid outlet through hole is connected to the hydrogen liquid outlet branch pipe via a third special joint.

[0019] The present invention also provides a control method for the above-mentioned electrolytic cell current sharing control system, comprising:

[0020] Obtaining the flow rates of the liquid inlet branch pipe, the oxygen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe;

[0021] Determine the difference in liquid inlet and outlet flow rates of the electrolysis chamber unit according to the flow rates of the liquid inlet branch pipe, the oxygen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe;

[0022] The openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve are controlled according to the difference in liquid inlet and liquid outlet flow of the electrolysis chamber unit.

[0023] According to a control method of an electrolytic cell flow control system provided by the present invention, the step of controlling the opening of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve according to the difference in liquid inlet and liquid outlet flow of the electrolytic chamber unit comprises:

[0024] Determining that the difference between the inlet and outlet flow rates of the electrolysis chamber unit is greater than a target preset value, and that the inlet flow rate of the electrolysis chamber unit is greater than the outlet flow rate, reducing the opening of the inlet regulating valve, and increasing the openings of the oxygen outlet regulating valve and the hydrogen outlet regulating valve;

[0025] Determine that the difference between the inlet and outlet liquid flow rates of the electrolysis chamber unit is greater than a target preset value, and that the outlet liquid flow rate of the electrolysis chamber unit is greater than the inlet liquid flow rate, increase the opening of the liquid inlet regulating valve, and reduce the openings of the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve.

[0026] A control method for an electrolytic cell current sharing control system provided by the present invention further includes:

[0027] Obtaining the operating power of the electrolysis chamber unit;

[0028] According to the operating power of the electrolysis chamber unit, the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump are controlled.

[0029] According to a control method of an electrolytic cell flow control system provided by the present invention, the step of controlling the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump according to the operating power of the electrolysis chamber unit comprises:

[0030] The reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump are positively correlated with the operating power of the electrolysis chamber unit.

[0031] The electrolytic cell flow equalization control system and method provided by the present invention can simplify the system structure and optimize the control by grouping the flow of the electrolytic chambers of the electrolytic cell, and realize rapid adjustment of the flow uniformity of each group of electrolytic chamber units. By arranging corresponding regulating valves on the inlet and outlet liquid branches to control the flow of each group of electrolytic chamber units, the flow distribution of each group of electrolytic chamber units can be guaranteed to be uniform and consistent, thereby ensuring uniform heat dissipation of the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the electrolytic cell current sharing control system provided by the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of the electrolytic cell provided by the present invention;

[0035] Figure 3 This is one of the flow charts of the control method of the electrolytic cell current sharing control system provided by the present invention;

[0036] Figure 4 This is the second flow chart of the control method of the electrolytic cell current sharing control system provided by the present invention.

[0037] Reference numerals:

[0038] 1: electrolytic cell; 101: electrolytic chamber; 2: liquid inlet main pipe; 3: liquid inlet regulating valve;

[0039] 4: oxygen liquid outlet main pipe; 5: oxygen liquid outlet regulating valve; 6: hydrogen liquid outlet main pipe;

[0040] 7: Hydrogen outlet regulating valve; 8: Controller; 9: Liquid inlet branch pipe;

[0041] 10: oxygen outlet branch pipe; 11: hydrogen outlet branch pipe; 12: variable frequency circulation pump;

[0042] 13: gas-liquid separator; 14: heat exchanger; 15: liquid inlet flow meter;

[0043] 16: Oxygen liquid outlet flow meter; 17: Hydrogen liquid outlet flow meter. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0046] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Combine the following Figure 1-Figure 4 The electrolytic cell current equalization control system and method of the present invention are described.

[0049] According to an embodiment of the first aspect of the present invention, referring to Figure 1 and Figure 2 As shown, the electrolytic cell flow control system provided by the present invention mainly includes: an electrolytic cell 1, a liquid inlet main pipe 2, a liquid inlet regulating valve 3, an oxygen liquid outlet main pipe 4, an oxygen liquid outlet regulating valve 5, a hydrogen liquid outlet main pipe 6, a hydrogen liquid outlet regulating valve 7 and a controller 8 and other components.

[0050] The electrolytic cell 1 includes a plurality of groups of electrolytic chamber units, and the electrolytic chambers 101 in the electrolytic cell 1 are grouped to form a plurality of groups of electrolytic chamber units.

[0051] The liquid inlet main pipe 2 is connected to a plurality of groups of electrolytic chamber units one by one through a plurality of liquid inlet branch pipes 9, and each liquid inlet branch pipe 9 is provided with a liquid inlet regulating valve 3 for regulating the liquid inlet amount of the corresponding electrolytic chamber unit.

[0052] The oxygen liquid outlet main pipe 4 is connected to a plurality of electrolysis chamber units one by one through a plurality of oxygen liquid outlet branch pipes 10, and each oxygen liquid outlet branch pipe 10 is provided with an oxygen liquid outlet regulating valve 5 for regulating the oxygen liquid outlet amount of the corresponding electrolysis chamber unit.

[0053] The hydrogen liquid outlet main pipe 6 is connected to a plurality of electrolysis chamber units one by one through a plurality of hydrogen liquid outlet branch pipes 11, and each hydrogen liquid outlet branch pipe 11 is provided with a hydrogen liquid outlet regulating valve 7 for regulating the hydrogen liquid outlet amount of the corresponding electrolysis chamber unit.

[0054] The controller 8 is electrically connected to the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 respectively, and is used to control the opening of the corresponding liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 according to the difference in the inlet and outlet liquid flow rates of the electrolysis chamber unit.

[0055] It can be understood that the liquid outlet flow rate of the electrolysis chamber unit includes the oxygen liquid outlet flow rate and the hydrogen liquid outlet flow rate.

[0056] During operation, the alkali liquid enters the electrolytic cell 1 through the liquid inlet main pipe 2, and enters the electrolytic chamber 101 of each group of electrolytic chamber units through the liquid inlet branch pipe 9, and then an electrolytic reaction occurs. The anode of the electrolytic chamber 101 generates oxygen, and the cathode generates hydrogen. The oxygen and the remaining alkali liquid enter the oxygen liquid outlet main pipe 4 through the oxygen liquid outlet branch pipe 10, and the hydrogen and the remaining alkali liquid enter the hydrogen liquid outlet main pipe 6 through the hydrogen liquid outlet branch pipe 11. All gas and liquid flow routes are exactly the same, ensuring the uniformity of the reaction and ensuring that each electrolytic chamber 101 fully participates in the reaction.

[0057] Moreover, during operation, according to the difference in the inlet and outlet liquid flow rates of each group of electrolysis chamber units, the openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 corresponding to each group of electrolysis chamber units are independently adjusted in real time, so that the flow rate of the pipeline can be adjusted, thereby ensuring that the flow rate of each group of electrolysis chamber units of the electrolytic cell 1 is evenly distributed.

[0058] When the difference between the inlet and outlet liquid flow rates of a group of electrolytic chamber units of the electrolytic cell 1 is greater than the target preset value, the automatic adjustment mode of the regulating valve is started, which specifically includes: when the inlet flow rate of the electrolytic chamber unit is greater than the outlet flow rate, the opening of the inlet regulating valve 3 is reduced, and the openings of the oxygen outlet regulating valve 5 and the hydrogen outlet regulating valve 7 are increased to reduce the deviation of the inlet and outlet liquid flow rates. At this stage, the regulating valves on each branch pipe need to cooperate. Simply adjusting the flow rate of one pipeline cannot solve the problem. For example, if the alkali solution flow rate entering the front end is large, If only the liquid inlet regulating valve 3 is adjusted, but the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are not adjusted, the flow resistance of the alkali solution entering the electrolytic chamber 101 will be too low, and the electrolytic chamber 101 at the front end will still allocate a lot of flow. Only by synchronously adjusting the regulating valves of the three pipelines of the electrolytic chamber unit can the uniformity of the inlet and outlet liquid flow be guaranteed; similarly, when the liquid outlet flow of the electrolytic chamber unit is greater than the liquid inlet flow, the opening of the liquid inlet regulating valve 3 is increased, and the opening of the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 is reduced to reduce the deviation of the inlet and outlet liquid flow. Therefore, when the flow distribution of each group of electrolytic chamber units is uneven, the regulating valves on the inlet and outlet branches of each group of electrolytic chamber units are adjusted to ensure that the flow distribution of each group of electrolytic chamber units is consistent.

[0059] Therefore, the electrolytic cell flow control system provided in the embodiment of the present invention adopts a segmented structure for the electrolytic cell 1, and divides the electrolytic chambers 101 of the electrolytic cell 1 into groups for flow control, which can simplify the system structure and optimize the control, and realize rapid adjustment of the flow uniformity of each group of electrolytic chamber units. By arranging corresponding regulating valves on the inlet and outlet liquid branches to control the flow of each group of electrolytic chamber units, the flow distribution of each group of electrolytic chamber units can be ensured to be uniform and consistent, thereby ensuring uniform heat dissipation of the electrolytic cell 1.

[0060] According to one embodiment of the present invention, referring to Figure 1 As shown, the electrolytic cell flow control system of the present invention also includes: a variable frequency circulation pump 12 and a power detector. The variable frequency circulation pump 12 is arranged between the liquid inlet main pipe 2 and the oxygen liquid outlet main pipe 4 and the hydrogen liquid outlet main pipe 6, and is electrically connected to the controller 8. The operating power is adjusted by adjusting the frequency of the variable frequency circulation pump 12, thereby adjusting the circulation amount of the alkali solution; the power detector is electrically connected to the electrolysis chamber unit and the controller 8 respectively, and the power detector is used to detect the operating power of the electrolysis chamber unit. The controller 8 is also used to control the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 and the operating power of the variable frequency circulation pump 12 according to the detected operating power of the electrolysis chamber unit, that is, it has a variable power adjustment mode.

[0061] When the electrolytic cell 1 switches the operating power, it will affect the electrolysis efficiency, thereby affecting the uniformity of the flow distribution of the electrolytic cell unit. Therefore, when the electrolytic cell 1 is under different operating powers, the corresponding adjustment reference point of the regulating valve and the operating power of the variable frequency circulation pump 12 can be matched, so as to ensure that the flow distribution of each group of electrolytic cell units is always consistent.

[0062] Specifically, when the operating power of the electrolysis chamber unit is the first operating power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are controlled to be proportionally adjusted to their respective first reference openings, and the variable frequency circulation pump 12 is controlled to operate to the first power;

[0063] When the operating power of the electrolysis chamber unit is the second operating power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are controlled to be proportionally adjusted to their respective second reference openings, and the variable frequency circulation pump 12 is controlled to operate to the second power;

[0064] When the operating power of the electrolysis chamber unit is the third operating power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are controlled to be proportionally adjusted to their respective third reference openings, and the variable frequency circulation pump 12 is controlled to operate to the third power;

[0065] Among them, the first operating power is less than the second operating power, and the second operating power is less than the third operating power; the first reference opening is less than the second reference opening, and the second reference opening is less than the second reference opening; the first power is less than the second power, and the second power is less than the third power.

[0066] For example, when the electrolysis chamber unit is in a low-power operating condition, the operating power is 20% to 50% of the rated power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are adjusted to 30% of the initial opening, and the power of the variable frequency circulation pump 12 is adjusted to 40% of the rated power; when the electrolysis chamber unit is in a stable power operating condition, the operating power is 50% to 100% of the rated power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are adjusted to 75% of the initial opening, and the power of the variable frequency circulation pump 12 is adjusted to 70% of the rated power; when the electrolysis chamber unit is in a high-power operating condition, the operating power is 100% to 110% of the rated power, the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are adjusted to 90% of the initial opening, and the power of the variable frequency circulation pump is adjusted to 90% of the rated power.

[0067] When the system switches from one operating condition to another, the regulating valve will begin to slowly and synchronously adjust the reference point in proportion. After the reference point is adjusted, the opening of the liquid inlet regulating valve 3, oxygen liquid outlet regulating valve 5 and hydrogen liquid outlet regulating valve 7 corresponding to each group of electrolysis chamber units can be independently adjusted in real time according to the difference in the inlet and outlet liquid flow rates of each group of electrolysis chamber units.

[0068] Therefore, an electrolytic cell flow equalization control system provided in an embodiment of the present invention has an automatic adjustment mode of a regulating valve and a variable power adjustment mode, and the advantage of this variable power adjustment mode is that the pump and the regulating valve can be flexibly adjusted to match according to different working conditions, thereby ensuring that the flow distribution of each group of electrolytic chamber units is always consistent, ensuring the consistency of the temperature field and flow field of the electrolytic cell under different working conditions, and effectively improving the flow distribution uniformity of each group of electrolytic chamber units.

[0069] According to one embodiment of the present invention, referring to Figure 1 As shown, the electrolytic cell flow control system of the present invention also includes: a gas-liquid separator 13 and a heat exchanger 14, the inlet of the gas-liquid separator 13 is respectively connected to the oxygen liquid outlet main pipe 4 and the hydrogen liquid outlet main pipe 6, and the liquid outlet of the gas-liquid separator 13 is connected to the variable frequency circulation pump 12; the heat exchanger 14 is connected between the variable frequency circulation pump 12 and the liquid inlet main pipe 2.

[0070] When the system is working normally, the alkali liquid in the electrolytic cell 1 undergoes an electrolytic reaction, the anode of the electrolytic chamber 101 generates oxygen, the cathode generates hydrogen, the oxygen and the remaining alkali liquid enter the oxygen liquid outlet main pipe 4 through the oxygen liquid outlet branch pipe 10, the hydrogen and the remaining alkali liquid enter the hydrogen liquid outlet main pipe 6 through the hydrogen liquid outlet branch pipe 11, and then enter the gas-liquid separator 13 for gas-liquid separation, the separated alkali liquid is sent to the heat exchanger 14 for cooling through the variable frequency circulation pump 12, and then enters the electrolytic cell 1 through the liquid inlet main pipe 2, and enters the electrolytic chamber 101 of each group of electrolytic chamber units through the liquid inlet branch pipe 9, and the cycle is repeated.

[0071] According to one embodiment of the present invention, referring to Figure 1 As shown, the liquid inlet branch pipe 9 is provided with a liquid inlet flowmeter 15, the oxygen liquid outlet branch pipe 10 is provided with an oxygen liquid outlet flowmeter 16, and the hydrogen liquid outlet branch pipe 11 is provided with a hydrogen liquid outlet flowmeter 17, and the liquid inlet flowmeter 15, the oxygen liquid outlet flowmeter 16 and the hydrogen liquid outlet flowmeter 17 are electrically connected to the controller 8 respectively.

[0072] Specifically, the flow rate of the pipeline is detected by a corresponding flow meter, and the detected flow rate is fed back to the controller 8. The controller 8 analyzes the difference in the inlet and outlet liquid flow rates of each group of electrolytic chamber units based on the obtained flow data. When the difference in the inlet and outlet liquid flow rates is greater than the target preset value, the automatic adjustment mode of the regulating valve is started. Please refer to the above for details, which will not be repeated here.

[0073] Furthermore, the regulating valve of the present invention may be a thin film high temperature regulating valve.

[0074] According to one embodiment of the present invention, the electrolysis chamber unit includes: a plurality of electrolysis chambers 101, and the electrolysis chambers 101 are formed by a plurality of bipolar plates arranged and distributed at intervals. For example, a group of electrolysis chamber units can be formed by 20 bipolar plates.

[0075] Furthermore, the liquid inlet and outlet flow rates in the text may be understood as the average liquid inlet and outlet flow rates of multiple electrolysis chambers 101 .

[0076] According to one embodiment of the present invention, the bipolar plate is provided with a liquid inlet through hole, an oxygen liquid outlet through hole and a hydrogen liquid outlet through hole which are connected to the electrolysis chamber 101. The liquid inlet through hole is connected to the liquid inlet branch pipe 9 via a first special joint, the oxygen liquid outlet through hole is connected to the oxygen liquid outlet branch pipe 10 via a second special joint, and the hydrogen liquid outlet through hole is connected to the hydrogen liquid outlet branch pipe 11 via a third special joint.

[0077] The embodiment of the present invention uses a bipolar plate as a channel structure for liquid inlet and outlet, and then a ferrule can be welded on the outer side of the bipolar plate to connect each branch pipe. This method can flexibly weld each branch pipe to the main pipe on site.

[0078] The control method of the electrolytic cell current equalization control system provided by the present invention is described below. The control method described below and the electrolytic cell current equalization control system described above can be referenced to each other.

[0079] According to an embodiment of the second aspect of the present invention, referring to Figure 3 As shown, the present invention also provides a control method for the electrolytic cell current sharing control system of the above embodiment, which mainly includes the following steps:

[0080] S100, obtaining the flow rates of the liquid inlet branch pipe 9, the oxygen liquid outlet branch pipe 10 and the hydrogen liquid outlet branch pipe 11.

[0081] Specifically, real-time detection can be performed through flow meters arranged on each branch pipe.

[0082] S200, determining the difference in liquid inlet and liquid outlet flow rates of the electrolysis chamber unit according to the flow rates of the liquid inlet branch pipe 9, the oxygen liquid outlet branch pipe 10 and the hydrogen liquid outlet branch pipe 11.

[0083] S300, controlling the openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 according to the difference in the liquid inlet and liquid outlet flow rates of the electrolysis chamber unit.

[0084] Specifically, it is determined that the difference between the inlet and outlet liquid flow rates of the electrolysis chamber unit is greater than the target preset value, and the inlet flow rate of the electrolysis chamber unit is greater than the outlet flow rate, the opening of the liquid inlet regulating valve 3 is reduced, and the openings of the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 are increased to reduce the inlet and outlet liquid flow deviation and keep the inlet and outlet liquid flow distribution of the electrolysis chamber unit uniform.

[0085] Determine that the difference between the inlet and outlet liquid flow rates of the electrolysis chamber unit is greater than the target preset value, and that the outlet liquid flow rate of the electrolysis chamber unit is greater than the inlet liquid flow rate, increase the opening of the liquid inlet regulating valve 3, and reduce the opening of the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 to reduce the inlet and outlet liquid flow deviation and keep the inlet and outlet liquid flow distribution of the electrolysis chamber unit uniform.

[0086] Therefore, the control method of the electrolytic cell flow equalization control system provided in the embodiment of the present invention controls the flow of each group of electrolytic chamber units through the regulating valves on the inlet and outlet liquid branches, which can ensure the uniformity of the flow distribution of each group of electrolytic chamber units, thereby ensuring uniform heat dissipation of the electrolytic cell 1.

[0087] According to one embodiment of the present invention, referring to Figure 4 As shown, the control method of the electrolytic cell current sharing control system of the present invention also includes the steps of:

[0088] S400, obtaining the operating power of the electrolysis chamber unit.

[0089] Specifically, the operating power of the electrolysis chamber unit can be detected in real time by a power detector.

[0090] S500, according to the operating power of the electrolysis chamber unit, control the reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 and the operating power of the variable frequency circulation pump 12.

[0091] The reference openings of the liquid inlet regulating valve 3, the oxygen liquid outlet regulating valve 5 and the hydrogen liquid outlet regulating valve 7 and the operating power of the variable frequency circulating pump 12 are positively correlated with the operating power of the electrolysis chamber unit. For details, please refer to the above variable power regulation mode, which will not be described here.

[0092] The control method provided in the embodiment of the present invention can flexibly adjust the pump and the regulating valve to match according to different working conditions, thereby ensuring that the flow distribution of each group of electrolysis chamber units is always consistent, ensuring the consistency of the temperature field and flow field of the electrolytic cell under different working conditions, and effectively improving the uniformity of the flow distribution of each group of electrolysis chamber units.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrolytic cell current sharing control system, characterized in that: include: An electrolytic cell, comprising a plurality of electrolytic chamber units; A liquid inlet main pipe is connected to the electrolysis chamber unit via a liquid inlet branch pipe, and the liquid inlet branch pipe is provided with a liquid inlet regulating valve for regulating the liquid inlet amount of the electrolysis chamber unit; An oxygen liquid outlet main pipe is connected to the electrolysis chamber unit via an oxygen liquid outlet branch pipe, and the oxygen liquid outlet branch pipe is provided with an oxygen liquid outlet regulating valve for regulating the oxygen liquid outlet amount of the electrolysis chamber unit; A hydrogen liquid outlet main pipe is connected to the electrolysis chamber unit via a hydrogen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe is provided with a hydrogen liquid outlet regulating valve for regulating the hydrogen liquid outlet amount of the electrolysis chamber unit; a controller, electrically connected to the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve, respectively, and used to control the opening of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve according to the difference in liquid inlet and liquid outlet flow of the electrolysis chamber unit; A variable frequency circulation pump is arranged between the liquid inlet main pipe and the oxygen liquid outlet main pipe and the hydrogen liquid outlet main pipe, and is electrically connected to the controller; A power detector is electrically connected to the electrolysis chamber unit and the controller, respectively, and the power detector is used to detect the operating power of the electrolysis chamber unit. The controller is also used to control the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve, as well as the operating power of the variable frequency circulation pump according to the detected operating power of the electrolysis chamber unit.

2. The electrolytic cell current equalization control system according to claim 1, characterized in that: Also includes: A gas-liquid separator, wherein the inlet of the gas-liquid separator is respectively connected to the oxygen liquid outlet main pipe and the hydrogen liquid outlet main pipe, and the liquid outlet of the gas-liquid separator is connected to the variable frequency circulation pump; The heat exchanger is connected between the variable frequency circulation pump and the liquid inlet main pipe.

3. The electrolytic cell current equalization control system according to claim 1, characterized in that: The liquid inlet branch pipe is provided with a liquid inlet flowmeter, the oxygen liquid outlet branch pipe is provided with an oxygen liquid outlet flowmeter, the hydrogen liquid outlet branch pipe is provided with a hydrogen liquid outlet flowmeter, and the liquid inlet flowmeter, the oxygen liquid outlet flowmeter and the hydrogen liquid outlet flowmeter are electrically connected to the controller respectively.

4. The electrolytic cell current balancing control system according to any one of claims 1 to 3, characterized in that: The electrolysis chamber unit comprises: a plurality of electrolysis chambers, wherein the electrolysis chambers are formed by a plurality of bipolar plates arranged and distributed at intervals.

5. The electrolytic cell current equalization control system according to claim 4, characterized in that: The bipolar plate is provided with a liquid inlet through hole, an oxygen liquid outlet through hole and a hydrogen liquid outlet through hole which are connected to the electrolysis chamber; the liquid inlet through hole is connected to the liquid inlet branch pipe via a first special joint, the oxygen liquid outlet through hole is connected to the oxygen liquid outlet branch pipe via a second special joint, and the hydrogen liquid outlet through hole is connected to the hydrogen liquid outlet branch pipe via a third special joint.

6. A control method for an electrolytic cell current sharing control system according to any one of claims 1 to 5, characterized in that: include: Obtaining the flow rates of the liquid inlet branch pipe, the oxygen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe; Determine the difference in liquid inlet and outlet flow rates of the electrolysis chamber unit according to the flow rates of the liquid inlet branch pipe, the oxygen liquid outlet branch pipe, and the hydrogen liquid outlet branch pipe; According to the difference in liquid inlet and outlet flow rates of the electrolysis chamber unit, the openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve are controlled; A variable frequency circulation pump is arranged between the liquid inlet main pipe and the oxygen liquid outlet main pipe and the hydrogen liquid outlet main pipe, and is electrically connected to the controller; A power detector is electrically connected to the electrolysis chamber unit and the controller, respectively, and the power detector is used to detect the operating power of the electrolysis chamber unit. The controller is also used to control the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve, as well as the operating power of the variable frequency circulation pump according to the detected operating power of the electrolysis chamber unit.

7. The control method of the electrolytic cell current sharing control system according to claim 6, characterized in that: The step of controlling the opening of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve according to the difference in liquid inlet and liquid outlet flow of the electrolysis chamber unit comprises: Determining that the difference between the inlet and outlet flow rates of the electrolysis chamber unit is greater than a target preset value, and that the inlet flow rate of the electrolysis chamber unit is greater than the outlet flow rate, reducing the opening of the inlet regulating valve, and increasing the openings of the oxygen outlet regulating valve and the hydrogen outlet regulating valve; Determine that the difference between the inlet and outlet liquid flow rates of the electrolysis chamber unit is greater than a target preset value, and that the outlet liquid flow rate of the electrolysis chamber unit is greater than the inlet liquid flow rate, increase the opening of the liquid inlet regulating valve, and reduce the openings of the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve.

8. The control method of the electrolytic cell current sharing control system according to claim 6, characterized in that: Also includes: Obtaining the operating power of the electrolysis chamber unit; According to the operating power of the electrolysis chamber unit, the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump are controlled.

9. The control method of the electrolytic cell current sharing control system according to claim 8, characterized in that: The step of controlling the reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump according to the operating power of the electrolysis chamber unit comprises: The reference openings of the liquid inlet regulating valve, the oxygen liquid outlet regulating valve and the hydrogen liquid outlet regulating valve and the operating power of the variable frequency circulation pump are positively correlated with the operating power of the electrolysis chamber unit.

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