CN114959753A - Seawater electrolysis hydrogen production system and hydrogen production control method thereof - Google Patents
Seawater electrolysis hydrogen production system and hydrogen production control method thereof Download PDFInfo
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- CN114959753A CN114959753A CN202110942556.2A CN202110942556A CN114959753A CN 114959753 A CN114959753 A CN 114959753A CN 202110942556 A CN202110942556 A CN 202110942556A CN 114959753 A CN114959753 A CN 114959753A
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- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
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Abstract
The embodiment of the application provides a seawater electrolysis hydrogen production system and a hydrogen production control method thereof, and the system comprises an ultrasonic electrolytic cell device, a circulating device and a gas-liquid separation device, wherein the circulating device and the gas-liquid separation device are connected with the ultrasonic electrolytic cell device; the circulating device pumps seawater into a tank body of the electrolytic tank through one of the water inlets, the seawater is taken as electrolyte, oxides and/or hydroxides generated by electrolysis of the electrolytic tank are conveyed to the gas-liquid separation device through an output port of the electrolytic tank along the flowing direction of the electrolyte under the action of the ultrasonic transducer, and the gas-liquid separation device is used for separating gas generated by the electrolytic tank and the flowing electrolyte and then discharging the gas and the flowing electrolyte respectively. Therefore, the deposition of oxides and/or hydroxides at the electrode can be prevented, the rapid reduction of the catalytic efficiency caused by the deposition of scale on the electrode is avoided, and the maintenance cost of the seawater electrolysis hydrogen production system is saved.
Description
Technical Field
The application relates to the field of new energy system design, in particular to a seawater electrolysis hydrogen production system and a hydrogen production control method.
Background
The most main problems faced by seawater electrolysis are that the seawater components are complex, and various ions are easy to form scale on the electrodes in the electrolysis process, thereby influencing the normal work of the electrodes. Calcium and magnesium ions react with hydroxide radicals generated by water decomposition on the surface of the cathode electrode to generate calcium-magnesium scale, and manganese ions are inevitably oxidized on the surface of the anode electrode to generate MnO in the electrolysis process 2 And if the sediment layer is deposited, the electrode resistance is increased if the scale is slightly accumulated, so that the voltage of the electrolytic cell is increased, the power consumption is increased, and the electrode is scrapped if the scale is heavy.
At present, the scale on the electrode is cleaned mainly by periodic acid cleaning, and the method not only increases the cost and influences the service life of equipment, but also can not completely and effectively remove the manganese scale. In addition, the concentration of manganese ions has great influence on the anode, when the concentration of manganese ions is more than 20 mug/L, the current efficiency of the anode can be rapidly reduced within a short time due to manganese deposition, and the problem of manganese scale is difficult to effectively solve by removing the manganese ions in the seawater through pretreatment, so that the problem of the scale becomes a great technical problem for limiting the development of the seawater electrolytic hydrogen production technology.
Disclosure of Invention
In order to solve the existing technical problems, the application provides the system and the control method for hydrogen production by the electrolyzed seawater, which can effectively remove the scale deposition of oxides and/or hydroxides generated by the electrolyzed seawater without regular cleaning.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a system for producing hydrogen by electrolyzing seawater, which includes an ultrasonic electrolyzer device, a circulation device connected to the ultrasonic electrolyzer device, and a gas-liquid separation device, wherein the ultrasonic electrolyzer device includes an electrolyzer and an ultrasonic transducer disposed on an outer wall of the electrolyzer, and the circulation device includes at least one water inlet; the circulating device pumps seawater into a tank body of the electrolytic tank through one of the water inlets, the seawater is taken as electrolyte, oxides and/or hydroxides generated by electrolysis of the electrolytic tank are conveyed to the gas-liquid separation device through an output port of the electrolytic tank along the flowing direction of the electrolyte under the action of the ultrasonic transducer, and the gas-liquid separation device is used for separating gas generated by the electrolytic tank and the flowing electrolyte and then discharging the separated gas and the flowing electrolyte respectively.
Optionally, the seawater electrolysis hydrogen production system further includes: the cooling device is connected with the gas-liquid separation device, and the double-cyclone filter is connected with the cooling device and is connected with the other water inlet of the circulating device; the cooling device is used for cooling the electrolyte separated by the gas-liquid separation device, the double-cyclone filter is used for filtering oxides and/or hydroxides, and the filtered electrolyte flows to the other water inlet contained in the circulating device again.
Optionally, the seawater electrolysis hydrogen production system further includes a first main pipeline connecting the circulation device and the ultrasonic electrolysis device, and a first flow control valve disposed on the first main pipeline, where the first flow control valve is used to control the flow of the aqueous solution pumped by the circulation device to the ultrasonic electrolysis device.
Optionally, the cooling device adopts a mode that cooling water cools the electrolyte, wherein the temperature value of the cooling water is 25 ℃.
Optionally, the gas-liquid separation device includes a hydrogen separator and an oxygen separator, the hydrogen separator is connected to the cathode chamber of the ultrasonic electrolysis device through a first branch liquid pipe, and the oxygen separator is connected to the anode chamber of the ultrasonic electrolysis device through a second branch liquid pipe; a first temperature measuring instrument is arranged on the main liquid path pipe, a second temperature measuring instrument is arranged on the first branch liquid path pipe, a third temperature measuring instrument is arranged on the second branch liquid path pipe, and the cooling device is provided with a second flow control valve; the second flow control valve is used for determining the flow value of the cooling water in the cooling device according to the temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument and controlling the flow of the cooling water in the cooling device according to the flow value.
Optionally, the number of the ultrasonic transducers is multiple, the ultrasonic transducers are arranged on two opposite sides of the electrolytic cell body, and the ultrasonic transducers are distributed at equal intervals on each side.
Optionally, the number of the ultrasonic transducers is 6 to 50, and the frequency range of each ultrasonic transducer is 10kHz to 200 kHz.
Optionally, the temperature value of the electrolyte in the cell body of the electrolytic cell ranges from 75 ℃ to 85 ℃.
In a second aspect, the embodiment of the application also provides a hydrogen production control method for the seawater electrolysis hydrogen production system, the seawater electrolysis hydrogen production system comprises an ultrasonic electrolytic tank device, a circulating device and a gas-liquid separation device which are connected with the ultrasonic electrolytic tank device, the ultrasonic electrolytic bath device comprises an electrolytic bath and an ultrasonic transducer arranged on the outer wall of the bath body of the electrolytic bath, the seawater electrolysis hydrogen production system also comprises a first main pipeline connecting the circulating device and the ultrasonic electrolysis device and a first flow control valve arranged on the first main pipeline, the gas-liquid separation device comprises a hydrogen separator and an oxygen separator, the hydrogen separator is connected with the cathode chamber of the ultrasonic electrolysis device through a first branch liquid pipeline, the oxygen separator is connected with the anode chamber of the ultrasonic electrolysis device through a second branch liquid pipeline; a first temperature measuring instrument is arranged on the first main liquid path pipe, a second temperature measuring instrument is arranged on the first branch liquid path pipe, a third temperature measuring instrument is arranged on the second branch liquid path pipe, and a second flow control valve is arranged on the cooling device; the seawater electrolysis hydrogen production system further comprises a controller, wherein the controller is used for determining a flow value of the cooling device according to temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument, and controlling the opening degree of the first flow valve and the second flow valve according to the flow value so as to adjust the flow of electrolyte flowing out of the cooling device, and the method comprises the following steps: respectively collecting the temperature of seawater at an input port of an electrolytic cell, the temperature of electrolyte at an output port of a cathode chamber of the electrolytic cell and the temperature of electrolyte at an output port of an anode chamber of the electrolytic cell; determining the current temperature of the electrolyte in the electrolytic cell according to the seawater temperature at the inlet of the electrolytic cell, the temperature of the electrolyte at the outlet of the cathode chamber of the electrolytic cell and the temperature of the electrolyte at the outlet of the anode chamber of the electrolytic cell; and if the current temperature exceeds a set value, adjusting the flow of the seawater at the input port of the electrolytic cell according to the difference value of the current temperature and the set value.
Optionally, the respectively acquiring the temperature of the seawater at the input port of the electrolytic cell, the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell, and the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell includes: the temperature of the seawater at the input port of the electrolytic cell is collected by the first temperature measuring instrument, the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell is collected by the second temperature measuring instrument, and the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell is collected by the second temperature measuring instrument.
According to the seawater electrolysis hydrogen production system and the hydrogen production control method, under the conditions that the circulating device prompts seawater to keep a flowing state and the ultrasonic transducer provides vibration, oxides and/or hydroxides generated when the electrolytic cell electrolyzes seawater can be taken away by flowing electrolyte in time, the deposition of the oxides and/or hydroxides at the electrode is effectively prevented, the rapid reduction of catalytic efficiency caused by the deposition of scale on the electrode is avoided, and the cleaning and maintenance cost of the seawater electrolysis hydrogen production system is saved.
Drawings
FIG. 1 is a schematic structural diagram of a seawater electrolysis hydrogen production system according to an embodiment of the present application;
FIG. 2 is a schematic structural view of the ultrasonic electrolysis apparatus shown in FIG. 1;
FIG. 3 is a schematic diagram of a system for producing hydrogen by electrolyzing seawater according to another embodiment of the present application;
fig. 4 is a schematic structural diagram between the second flow control valve and three temperature measuring instruments in fig. 3.
Fig. 5 is a flow chart of a method for producing hydrogen by electrolyzing seawater according to an embodiment of the present application.
Detailed Description
The technical solution of the present application is further described in detail with reference to the drawings and specific embodiments of the specification.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of implementations of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Although the research on hydrogen production by fresh water electrolysis is mature. However, the hydrogen production by the electrolysis of fresh water occupies a large amount of fresh water resources. From the perspective of saving fresh water resources, research on hydrogen production by electrolyzing seawater is carried out by global researchers. The hydrogen production by seawater electrolysis has two modes, the first mode is to desalt seawater and remove impurities to form fresh water and then carry out electrolysis, and the second mode is to directly carry out electrolysis on seawater. The first method increases the cost of seawater desalination. Therefore, researchers pay more attention to direct electrolysis of seawater for hydrogen production.
Fig. 1 is a schematic structural diagram of a system for electrolyzing seawater to produce hydrogen in an embodiment of the present application. The seawater electrolysis hydrogen production system comprises an ultrasonic electrolytic tank device 11, a circulating device 12 and a gas-liquid separation device 13, wherein the circulating device 12 is connected with the ultrasonic electrolytic tank device 11, the ultrasonic electrolytic tank device 11 comprises an electrolytic tank and an ultrasonic transducer arranged on the outer wall of the electrolytic tank body, and the circulating device 12 comprises at least one water inlet; the circulating device 12 pumps seawater into the body of the electrolytic cell through one of the included water inlets, the seawater serving as electrolyte is conveyed to the gas-liquid separation device 13 through the output port of the electrolytic cell along the flowing direction of the electrolyte under the action of the ultrasonic transducer, and the gas-liquid separation device is used for separating the gas generated by the electrolytic cell and the flowing electrolyte and then discharging the separated gas and the flowing electrolyte.
In the embodiment of the present application, please refer to fig. 2, the ultrasonic electrolyzer unit 11 includes an electrolyzer 111 and an ultrasonic transducer 112 disposed on an outer wall of the electrolyzer 111. The electrolytic cell 111 includes an anode chamber for loading the seawater solution and electrolyzing a portion of the seawater to produce oxygen and a cathode chamber for loading the seawater solution and electrolyzing a portion of the seawater to produce hydrogen. The ultrasonic transducer 112 is a device for converting high-frequency electric energy into mechanical energy, and functions to convert input electric power into mechanical power (i.e., ultrasonic waves) and transmit the mechanical power. Therefore, during the process of electrolyzing seawater in the electrolytic cell, the ultrasonic transducer positioned on the outer wall of the electrolytic cell body provides vibration, so that oxides and/or hydroxides generated by electrolyzing seawater in the electrolytic cell cannot be deposited. With continued reference to fig. 1, a circulation device 12 is provided to draw seawater and circulate it throughout the seawater electrolysis hydrogen production system. The circulation device 12 may include one or more water inlets through one of which seawater is pumped to each device in the seawater electrolysis hydrogen production system; in general, the circulation device 12 may employ a circulation pump. The gas-liquid separator 13 is used to separate the electrolyte solution containing hydrogen, oxygen, and oxides and/or hydroxides flowing out of the electrolytic cell into a gas and a liquid, and a gas-liquid separator may be used as the gas-liquid separator 13 in general. The gas-liquid separator adopts a plurality of separation structures, and the separation method comprises the following steps: gravity settling, baffling separation, centrifugal separation, silk screen separation, ultrafiltration separation, filler separation and the like. The gas-liquid separator adopts a gravity settling separation method, namely, because of different specific gravities of gas and liquid, when the electrolyte flows together with hydrogen and oxygen, the electrolyte is greatly influenced by gravity to generate a downward speed, and the hydrogen and oxygen still flow towards the original direction, namely, the electrolyte and the hydrogen and oxygen have the tendency of being separated in a gravity field, the downward electrolyte is attached to the wall surface, converged together and discharged through a liquid conveying pipe of the gas-liquid separator, and the upward hydrogen and oxygen are discharged through a liquid conveying pipe of the gas-liquid separator.
Because the composition of the seawater is complex, the contained metal ions can generate a large amount of oxides and/or hydroxides in the process of producing hydrogen by electrolyzing the seawater as an electrolyte, and if the oxides and/or hydroxides are deposited in an electrolytic cell, the effects of the electrodes are influenced. Therefore, in the hydrogen production system by electrolyzing seawater in the embodiment of the present application, the circulation device 12 pumps seawater into the tank body of the electrolytic tank 111 through one of the included water inlets, the seawater serving as an electrolyte is transported to the gas-liquid separation device 13 through the output port of the electrolytic tank 111 along the flowing direction of the electrolyte under the action of the ultrasonic transducer 112, and the gas-liquid separation device 13 is used for separating the gas generated by the electrolytic tank 111 and the flowing electrolyte and then discharging the separated gas and the flowing electrolyte respectively. Thus, under the conditions that the circulating device 12 prompts the seawater to keep a flowing state and the ultrasonic transducer 112 provides vibration, the oxide and/or hydroxide generated when the seawater is electrolyzed by the electrolytic cell 111 can be taken away by the flowing electrolyte in time, the deposition of the oxide and/or hydroxide on the electrode is effectively prevented, the rapid reduction of the catalytic efficiency caused by the deposition of the scale on the electrode is avoided, and the cleaning and maintenance cost of the seawater electrolysis hydrogen production system is saved.
In some embodiments, referring to fig. 3, the system for producing hydrogen by electrolyzing seawater further comprises: a cooling device 14 connected with the gas-liquid separation device 13 and a double cyclone filter 15 connected with the cooling device 14, wherein the double cyclone filter 15 is connected with the other water inlet of the circulating device 12; the cooling device 14 is configured to cool the electrolyte separated by the gas-liquid separation device 13, the double cyclone filter 15 filters oxides and/or hydroxides, and the filtered electrolyte flows to the other water inlet of the circulation device 12 again.
In the embodiment of the present application, the cooling device 14 is used to cool the electrolyzed water discharged from the gas-liquid separation device 13. The cooling device 14 is typically water or air as a coolant to remove heat from the electrolyte. The double cyclone filter 15 is used for filtering the flowing electrolyte through a filter screen, wherein oxides and/or hydroxides and other impurities are blocked, and the filtered electrolyte flows to another water inlet included in the circulating device 12 connected with the double cyclone filter 15. The embodiment of the application the cooling device among the electrolytic seawater hydrogen production system cool down the electrolyte that gas-liquid separation 13 separated, double cyclone filter 15 filters oxide and/or hydroxide, electrolyte after the filtration flows to another water inlet of circulating device 12 once more, so, not only can the cyclic utilization water resource, can also cool off electrolyte and export to in good time adjust the temperature of electrolyte in electrolysis trough 111.
In some embodiments, the seawater electrolysis hydrogen production system further includes a first main liquid pipeline 16 connecting the circulation device 12 and the ultrasonic electrolysis device 11, and a first flow control valve 161 disposed on the first main liquid pipeline, wherein the first flow control valve 161 is configured to control a flow amount of the aqueous solution pumped by the circulation device 12 to the ultrasonic electrolysis device 11. Here, the first flow control valve 161 may be a manual flow control valve or an automatic flow control valve that controls the flow rate of the orifice by an electronic circuit, and the first flow control valve 161 may be a throttle valve, a speed control valve, a flow dividing and collecting valve, or the like. In this way, the hydrogen production system by seawater electrolysis can timely adjust the flow rate of the first flow control valve 161 according to the temperature and/or the liquid capacity of the electrolyte in the electrolytic cell 111, for example, if the temperature of the electrolyte in the electrolytic cell 111 is higher than a preset value and/or the liquid capacity is lower than a preset value, the flow rate of the orifice of the first flow control valve 161 is increased. The seawater electrolysis hydrogen production system can timely adjust the flow of seawater flowing into the electrolytic cell 111 according to the temperature and/or the liquid capacity of the electrolyte, and the adaptability of the system is enhanced.
In some embodiments, the cooling device 14 cools the electrolyte by using cooling water, wherein the temperature of the cooling water is 25 ℃. The cooling process of electrolyte is controlled through the flow of adjusting cooling water to reach the purpose of regulation and control electrolyte's temperature. The cooled electrolyte flows back to the electrolytic cell 111 through the double-cyclone filter 15 and the circulating device 12, so as to reduce the temperature value of the electrolyte in the electrolytic cell 111 and enhance the stability and applicability of the hydrogen production process by electrolyzing seawater.
In some embodiments, the gas-liquid separation device 13 comprises a hydrogen separator 131 and an oxygen separator 132, the hydrogen separator 131 is connected with the cathode chamber of the ultrasonic electrolysis device 11 through a first branch pipe 17, and the oxygen separator 132 is connected with the anode chamber of the ultrasonic electrolysis device 11 through a second branch pipe 18; a first temperature measuring instrument 162 is arranged on the main liquid path pipe 16, a second temperature measuring instrument 171 is arranged on the first branch liquid path pipe 171, a third temperature measuring instrument 181 is arranged on the second branch liquid path pipe 18, and a second flow control valve 141 is arranged on the cooling device 14; the second flow control valve 141 is configured to determine a flow value of the cooling water in the cooling device 14 according to temperature values of the first temperature measuring instrument 162, the second temperature measuring instrument 171, and the third temperature measuring instrument 181, and control a flow amount of the cooling water in the cooling device 14 according to the flow value.
In the embodiment of the present application, the hydrogen generated by the electrolytic cell 11 using seawater as the electrolyte flows to the hydrogen separator 131 through the first branch line pipe 17, the hydrogen separator 131 separates the electrolyte from the hydrogen, the separated hydrogen is discharged through the upper port of the hydrogen separator 131, and the separated electrolyte flows to the cooling device 14 through the lower port of the hydrogen separator 131; similarly, the electrolyte flowing along with the oxygen generated by the electrolytic cell 11 using seawater as the electrolyte flows to the oxygen separator 132 through the second branch conduit 18, the oxygen separator 132 separates the electrolyte from the oxygen, the separated oxygen is discharged through the upper port of the oxygen separator 132, and the separated electrolyte flows to the cooling device 14 through the lower port of the oxygen separator 132. The first branch liquid path pipe 17 is provided with a second temperature measuring instrument 171, the second branch liquid path pipe 18 is provided with a third temperature measuring instrument 181, the second temperature measuring instrument 171 is used for monitoring the temperature value of the electrolyte flowing through the first branch liquid path pipe 17, and the third temperature measuring instrument 181 is used for monitoring the temperature value of the electrolyte flowing through the second branch liquid path pipe 18. Meanwhile, the first temperature measuring instrument 161 is used to monitor a temperature value of the electrolyte flowing through the first main liquid path pipe 16. The second flow control valve 141 may be a manual control valve or an electric control valve. When the second flow control valve 141 is a manual control valve, the monitor may correspondingly adjust the opening degree of the second flow control valve 141 according to the temperature values of the three temperature measuring instruments. For example, referring to fig. 4, the system for producing hydrogen by electrolyzing seawater further includes a controller 10, wherein the controller 10 is respectively connected to the first temperature measuring instrument 162, the second temperature measuring instrument 171, the third temperature measuring instrument 181, the first flow control valve 161, and the second flow control valve 141, and the controller 10 is configured to obtain temperature values of the first temperature measuring instrument 162, the second temperature measuring instrument 171, and the third temperature measuring instrument 181, and perform analog operation according to a data model to control the opening degree of the first flow control valve 161 and/or the second flow control valve 141, so as to control the temperature of the electrolyte in the electrolytic cell 111. Therefore, the system for producing hydrogen by electrolyzing seawater according to the embodiment of the present application can accurately adjust the flow of cooling water in the cooling device 14 according to the temperature values of the first temperature measuring instrument 162, the second temperature measuring instrument 171 and the third temperature measuring instrument 181 corresponding to different positions, and further adjust the temperature of the electrolyte flowing through the cooling device 14, thereby indirectly controlling the water inlet temperature of the electrolytic cell 111, and maintaining the temperature of the electrolyte in the electrolytic cell 111 within a reasonable range. For example, if the temperatures measured by the second temperature measuring instrument 171 and the third temperature measuring instrument 181 exceed the set threshold, the opening degree of the second flow control valve 141 is increased, that is, the flow rate of the cooling water is increased to perform a large temperature reduction on the electrolyte flowing through the cooling device 14, so that the temperature at the first temperature measuring instrument 162 is within the set threshold range. If the temperatures measured by the second temperature measuring instrument 171 and the third temperature measuring instrument 181 are within the set threshold value range, the opening degree of the second flow rate control valve 141 is decreased or the second flow rate control valve 141 is closed. Namely, the system for producing hydrogen by electrolyzing water can timely adjust the temperature of the electrolyte in the electrolyte 111 according to the water temperatures of the input end and the output end of the electrolytic cell 111, and the stability and the applicability of the process of producing hydrogen by electrolyzing seawater are enhanced.
In some embodiments, with reference to fig. 3, the number of the ultrasonic transducers 112 is multiple, the ultrasonic transducers 112 are disposed on two opposite sides of the electrolytic cell 111, and the ultrasonic transducers are equally spaced on each side. Therefore, the electrolytic balance of the ultrasonic electrolysis device 11 in the seawater electrolysis process can be kept, the timely discharge of oxides and/or hydroxides in the electrolytic cell along with the electrolyte is facilitated, and the stability and the applicability of the seawater electrolysis hydrogen production process are enhanced.
In some embodiments, the number of the ultrasonic transducers 112 is 6 to 50, and the frequency of each of the ultrasonic transducers 112 is in a range of 10kHz to 200 kHz. For example, with continued reference to fig. 1, the number of ultrasonic transducers 112 is 6. Therefore, the electrolytic balance of the ultrasonic electrolysis device 11 in the seawater electrolysis process can be kept, the timely discharge of oxides and/or hydroxides in the electrolytic cell along with the electrolyte is facilitated, and the stability and the applicability of the seawater electrolysis hydrogen production process are enhanced.
In some embodiments, the temperature of the electrolyte within the cell body of the electrolytic cell 111 ranges from 75 ℃ to 85 ℃. Here, the temperature of the electrolyte in the electrolytic bath 111 is set in advance to be in the range of 75 ℃ to 85 ℃ in order to make the electrolysis rate of the electrolyte in the bath body of the electrolytic bath 111 a desired value on the one hand and to save the energy consumption of the electrolytic bath 111 in the process of electrolyzing seawater on the other hand. Therefore, the stability and the applicability of the process of producing hydrogen by electrolyzing seawater are enhanced.
The embodiment of the application also provides a hydrogen production control method, the seawater electrolysis hydrogen production system comprises an ultrasonic electrolytic tank device, a circulating device and a gas-liquid separation device, wherein the circulating device and the gas-liquid separation device are connected with the ultrasonic electrolytic tank device; a first temperature measuring instrument is arranged on the first main liquid path pipe, a second temperature measuring instrument is arranged on the first branch liquid path pipe, a third temperature measuring instrument is arranged on the second branch liquid path pipe, and a second flow control valve is arranged on the cooling device; the seawater electrolysis hydrogen production system further comprises a controller, wherein the controller is used for determining a flow value of the cooling device according to temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument, and controlling opening degrees of the first flow valve and the second flow valve according to the flow value so as to adjust the flow of electrolyte flowing out of the cooling device, please refer to fig. 5, and the method comprises the following steps:
s501, respectively collecting the temperature of seawater at an input port of an electrolytic cell, the temperature of electrolyte at an output port of a cathode chamber of the electrolytic cell and the temperature of electrolyte at an output port of an anode chamber of the electrolytic cell.
The controller collects the temperature of the seawater at the input port of the electrolytic cell, the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell and the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell respectively.
S502, determining the current temperature of the electrolyte in the electrolytic cell according to the seawater temperature at the inlet of the electrolytic cell, the temperature of the electrolyte at the outlet of the cathode chamber of the electrolytic cell and the temperature of the electrolyte at the outlet of the anode chamber of the electrolytic cell.
Here, the controller determines the current temperature of the electrolyte in the electrolytic cell according to the seawater temperature at the inlet of the electrolytic cell, the electrolyte temperature at the outlet of the cathode chamber of the electrolytic cell and the electrolyte temperature at the outlet of the anode chamber of the electrolytic cell.
S503, if the current temperature exceeds the set value, the flow of the seawater at the input port of the electrolytic cell is adjusted according to the difference value between the current temperature and the set value.
Here, the set value is a value stored in advance to provide a reference standard for the controller. The controller judges whether the current temperature of the electrolyte in the electrolytic cell exceeds a set value or not, and if the current temperature exceeds the set value, the controller adjusts the flow of the seawater at the input port of the electrolytic cell according to the difference value between the current temperature and the set value. Wherein, the adjustment of the flow rate of the seawater at the input port of the electrolytic cell can be to increase the power of the circulating device, and the like.
According to the hydrogen production control method provided by the embodiment of the application, under the conditions that the circulating device prompts the seawater to keep a flowing state and the ultrasonic transducer provides vibration, oxides and/or hydroxides generated when the seawater is electrolyzed by the electrolytic cell can be taken away by the flowing electrolyte in time, the deposition of the oxides and/or hydroxides at the electrode is effectively prevented, the production efficiency of hydrogen production by electrolyzing the seawater is improved, and the maintenance cost of a hydrogen production system by electrolyzing the seawater is saved; moreover, electrolysis sea water hydrogen manufacturing system in this application embodiment adopts cooling device to cool off the electrolyte that gas-liquid separation device separates to and adopt two cyclone filter to filter oxide and/or hydroxide, and electrolyte after the filtration flows to another water inlet of circulating device once more, not only can cyclic utilization water resource, can also in good time adjust the temperature of electrolyte in the electrolysis trough. In addition, the controller is adopted to timely adjust the opening degree of a flow valve for controlling the cooling device to output the electrolyte according to the temperature values of the input port and the output port of the electrolytic cell, so that the water inlet temperature of the electrolytic cell is controlled, and the temperature of the electrolyte in the electrolytic cell is maintained within a reasonable range.
In some embodiments, the separately collecting the temperature of the seawater at the input port of the electrolytic cell, the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell, and the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell comprises: the temperature of the seawater at the input port of the electrolytic cell is collected by the first temperature measuring instrument, the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell is collected by the second temperature measuring instrument, and the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell is collected by the second temperature measuring instrument. Therefore, the hydrogen production control method can accurately adjust the flow of cooling water in the cooling device according to the temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument which correspond to different positions, further adjust the temperature of electrolyte flowing through the cooling device 14, further accurately and timely control the water inlet temperature of the electrolytic cell, maintain the temperature of the electrolyte in the electrolytic cell within a reasonable range, and enhance the stability and the applicability of the hydrogen production process by electrolyzing seawater.
The above description is only for the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall cover the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A seawater electrolysis hydrogen production system is characterized by comprising an ultrasonic electrolytic tank device, a circulating device and a gas-liquid separation device, wherein the circulating device is connected with the ultrasonic electrolytic tank device; the circulating device pumps seawater into the electrolytic tank body through one of the water inlets, the seawater serving as electrolyte is conveyed to the gas-liquid separation device through the output port of the electrolytic tank along the flowing direction of the electrolyte under the action of the ultrasonic transducer, and the gas-liquid separation device is used for separating gas generated by the electrolytic tank and the flowing electrolyte and then discharging the gas and the flowing electrolyte respectively.
2. A system for producing hydrogen by electrolyzing seawater as recited in claim 1, further comprising: the cooling device is connected with the gas-liquid separation device, and the double-cyclone filter is connected with the cooling device and is connected with the other water inlet of the circulating device; the cooling device is used for cooling the electrolyte separated by the gas-liquid separation device, the double-cyclone filter is used for filtering oxides and/or hydroxides, and the filtered electrolyte flows to the other water inlet of the circulating device again.
3. The seawater electrolysis hydrogen production system according to claim 2, further comprising a first main pipeline connecting the circulation device and the ultrasonic electrolysis device, and a first flow control valve arranged on the first main pipeline, wherein the first flow control valve is used for controlling the flow of the aqueous solution pumped by the circulation device to the ultrasonic electrolysis device.
4. The seawater electrolysis hydrogen production system according to claim 2, wherein the cooling device adopts a mode that cooling water cools the electrolyte, wherein the temperature value of the cooling water is 25 ℃.
5. The seawater electrolysis hydrogen production system according to claim 3, wherein the gas-liquid separation device comprises a hydrogen separator and an oxygen separator, the hydrogen separator is connected with the cathode chamber of the ultrasonic electrolysis device through a first branch liquid pipeline, and the oxygen separator is connected with the anode chamber of the ultrasonic electrolysis device through a second branch liquid pipeline; a first temperature measuring instrument is arranged on the main liquid path pipe, a second temperature measuring instrument is arranged on the first branch liquid path pipe, a third temperature measuring instrument is arranged on the second branch liquid path pipe, and a second flow control valve is arranged on the cooling device; the second flow control valve is used for determining the flow value of the cooling water in the cooling device according to the temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument and controlling the flow of the cooling water in the cooling device according to the flow value.
6. The system for producing hydrogen by electrolyzing seawater as in claim 1, wherein the number of the ultrasonic transducers is multiple, the ultrasonic transducers are arranged on two opposite sides of the electrolytic tank body, and the ultrasonic transducers are distributed at equal intervals on each side.
7. The seawater hydrogen production system according to claim 6, wherein the number of the ultrasonic transducers is 6 to 50, and the frequency of each ultrasonic transducer is 10kHz-200 kHz.
8. A system for producing hydrogen by electrolyzing seawater according to claim 1, wherein the temperature of the electrolyte in the tank body of the electrolytic tank is in the range of 75 ℃ to 85 ℃.
9. A hydrogen production control method of a seawater electrolysis hydrogen production system is characterized in that the seawater electrolysis hydrogen production system comprises an ultrasonic electrolytic tank device, a circulating device and a gas-liquid separation device, wherein the circulating device and the gas-liquid separation device are connected with the ultrasonic electrolytic tank device; a first temperature measuring instrument is arranged on the first main liquid path pipe, a second temperature measuring instrument is arranged on the first branch liquid path pipe, a third temperature measuring instrument is arranged on the second branch liquid path pipe, and a second flow control valve is arranged on the cooling device;
the seawater electrolysis hydrogen production system further comprises a controller, wherein the controller is used for determining a flow value of the cooling device according to temperature values of the first temperature measuring instrument, the second temperature measuring instrument and the third temperature measuring instrument, and controlling the opening degree of the first flow valve and the second flow valve according to the flow value so as to adjust the flow of electrolyte flowing out of the cooling device, and the method comprises the following steps:
respectively collecting the temperature of seawater at an input port of an electrolytic cell, the temperature of electrolyte at an output port of a cathode chamber of the electrolytic cell and the temperature of electrolyte at an output port of an anode chamber of the electrolytic cell;
determining the current temperature of the electrolyte in the electrolytic cell according to the seawater temperature at the inlet of the electrolytic cell, the temperature of the electrolyte at the outlet of the cathode chamber of the electrolytic cell and the temperature of the electrolyte at the outlet of the anode chamber of the electrolytic cell;
and if the current temperature exceeds a set value, adjusting the flow of the seawater at the input port of the electrolytic cell according to the difference value between the current temperature and the set value.
10. The hydrogen production control method of claim 9, wherein the separately collecting the temperature of the seawater at the input port of the electrolytic cell, the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell, and the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell comprises:
the temperature of the seawater at the input port of the electrolytic cell is collected by the first temperature measuring instrument, the temperature of the electrolyte at the output port of the anode chamber of the electrolytic cell is collected by the second temperature measuring instrument, and the temperature of the electrolyte at the output port of the cathode chamber of the electrolytic cell is collected by the second temperature measuring instrument.
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| CN115287680A (en) * | 2022-09-21 | 2022-11-04 | 中能(江苏苏州)氢能源科技有限公司 | Water electrolysis hydrogen production system utilizing ultrasonic field |
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| CN115287680A (en) * | 2022-09-21 | 2022-11-04 | 中能(江苏苏州)氢能源科技有限公司 | Water electrolysis hydrogen production system utilizing ultrasonic field |
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