System for inhibiting reverse current of electrolyzed water

Abstract

The utility model discloses a system for inhibiting reverse current of electrolyzed water, which comprises an electrolytic bath, an alkali liquor circulating pump, an oxygen-in-hydrogen analyzer and a nitrogen charging part, one side of the alkali liquor circulating pump is connected with the electrolytic bath, the other side of the alkali liquor circulating pump is connected with the nitrogen charging part, and the oxygen-in-hydrogen analyzer is connected with the electrolytic bath. According to the system for inhibiting the reverse current of the electrolyzed water, the current inhibiting component is additionally arranged on the electrolytic bath, and different types of valves are arranged for protection, so that the stability and the working efficiency of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolyzed water inhibition, in particular to a system for inhibiting the reverse current of electrolyzed water. Background Technique

[0002] After the electrolytic cell for hydrogen production stops running, a certain concentration of hydrogen and oxygen is still dissolved in the electrolyte system. As the caustic solution is still circulating continuously, under the action of Brownian motion, there will be continuously moving electrons in the caustic solution and on the bipolar plates of the electrolytic cell. Therefore, a closed loop of electrons and ions will be formed inside the electrolytic cell, resulting in a reverse current, that is, the reverse reaction of hydrogen production by electrolyzed water will occur.

[0003] The reverse current will cause the following problems: 1. The hydrogen on the cathode side of the electrolytic cell will be quickly removed by the discharge reaction, and the excess oxygen will also continue to be discharged, and the cathode will start to be oxidized and corroded; 2. The reverse current makes the electrolytic cell body become a small power generation body, and the reverse current will generate a small electromagnetic signal interference on the electrical components of the hydrogen production system; 3. The reverse current will affect the start-stop time of the electrolytic cell, correspondingly increasing the hydrogen production energy consumption and being unfavorable to the long-term operation stability of the electrolytic cell.

[0004] Hydrogen production by electrolyzed water is a process of continuously producing hydrogen and oxygen at the anode and cathode. Because 30% potassium hydroxide is used as the electrolyte solution and circulates continuously, the hydrogen and oxygen produced will dissolve in the caustic solution and escape along with the circulation of the caustic solution and the separation effect of the separator. Since the gas has a certain solubility in the solution, even if the hydrogen and oxygen are circulated and separated many times, the electrolyte system will still carry a small amount of gas. If no measures are taken, the residual gas will be difficult to escape from the system completely in a short time. The cathode and liquid channels of the electrolytic cell, and the anode and liquid channels are all connected, and a small amount of electrons will remain on the bipolar plates. Under these sufficient conditions, a weak primary battery reaction will occur inside the electrolytic cell, the hydrogen and oxygen will be consumed and reacted, and a reverse current opposite to the polarity of the rectifier power supply of the electrolytic cell will be generated in the closed loop. The reverse current and the electrolysis reaction are inverse processes to each other, which will accelerate the corrosion of the electrodes, especially the corrosion degree of the electrodes in the middle position is more serious. Content of the Utility Model

[0005] The purpose of the utility model is to provide a system for inhibiting the reverse current of electrolyzed water, adding an inhibition current component to the electrolytic cell, and providing different types of valves for protection to improve the stability and working efficiency of the system.

[0006] The utility model provides a system for inhibiting the reverse current of electrolyzed water, which includes an electrolytic cell, a caustic solution circulation pump, a hydrogen-in-oxygen analyzer, and a nitrogen filling part. One side of the caustic solution circulation pump is connected to the electrolytic cell, the other side of the caustic solution circulation pump is connected to the nitrogen filling part, and the hydrogen-in-oxygen analyzer is connected to the electrolytic cell.

[0007] Preferably, the electrolytic cell includes a reverse current component and a current suppression component, and the current suppression component is externally applied to the electrolytic cell.

[0008] Preferably, a temperature detection component is provided between the electrolytic cell and the lye circulation pump.

[0009] Preferably, the nitrogen charging part includes a nitrogen replacement component, an oxygen separator, a hydrogen separator, and a gas-water separator. A hydrogen outlet and a sampling port are provided on one side of the gas-water separator. A back pressure valve is provided between the gas-water separator and the hydrogen outlet, and a stop valve is provided between the gas-water separator and the sampling port.

[0010] Preferably, an oxygen outlet is provided at the outlet of the oxygen separator, and a pure water replenishment port is provided at the inlet of the oxygen separator.

[0011] Preferably, a ball valve is provided between the oxygen separator and the lye circulation pump.

[0012] Preferably, a check valve is provided between the oxygen-in-hydrogen analyzer and the gas-water separator.

[0013] Therefore, the present utility model adopts the above-mentioned reverse current suppression system for electrolyzed water, externally applies a current suppression component to the electrolytic cell, and is provided with different types of valves for protection, improving the stability and working efficiency of the system.

[0014] Next, through the drawings and embodiments, the technical solutions of the present utility model will be further described in detail. Description of the Drawings

[0015] Figure 1 It is an overall schematic diagram of a reverse current suppression system for electrolyzed water according to the present utility model;

[0016] Figure 2 It is a schematic diagram of the electrolytic cell of a reverse current suppression system for electrolyzed water according to the present utility model.

[0017] Reference Signs

[0018] 1. Electrolytic cell; 11. Reverse current component; 12. Current suppression component; 2. Lye circulation pump; 3. Oxygen-in-hydrogen analyzer; 4. Nitrogen charging part; 41. Nitrogen replacement component; 42. Oxygen separator; 43. Hydrogen separator; 44. Gas-water separator; 45. Hydrogen outlet; 46. Sampling port; 47. Back pressure valve; 48. Stop valve; 49. Oxygen outlet; 50. Pure water replenishment port; 51. Ball valve; 52. Check valve; 5. Temperature detection component. Detailed Embodiments

[0019] The technical solutions of the present utility model will be further described below through the drawings and embodiments.

[0020] Unless otherwise defined, the technical terms or scientific terms used in this utility model shall have the ordinary meanings understood by those with ordinary skills in the field to which this utility model belongs.

[0021] The "first", "second" and similar words used in this utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] Embodiment 1

[0023] As Figure 1 - Figure 2 shown, a reverse current suppression system for electrolyzed water of this utility model includes an electrolytic cell 1, an alkaline solution circulation pump 2, a hydrogen in oxygen analyzer 3, and a nitrogen filling part 4. One side of the alkaline solution circulation pump 2 is connected to the electrolytic cell 1, ensuring the circulation of the electrolyte solution, thus maintaining the normal operation of the electrolytic cell 1. The other side of the alkaline solution circulation pump 2 is connected to the nitrogen filling part 4, and the nitrogen filling part 4 is used to supply nitrogen to the system to maintain a stable operating environment. The hydrogen in oxygen analyzer 3 is connected to the electrolytic cell 1 and is used to monitor the oxygen content in the hydrogen generated by the electrolytic cell 1. The hydrogen in oxygen analyzer 3 detects the real-time concentration of hydrogen in oxygen.

[0024] A temperature detection component 5 is provided between the electrolytic cell 1 and the alkaline solution circulation pump 2, and the temperature detection component 5 can detect the real-time temperature. Through the feedback of the temperature detection component 5, control can be carried out to maintain the stable operation of the electrolytic cell 1.

[0025] The electrolytic cell 1 includes a reverse current component 11 and a current suppression component 12. The reverse current component 11 is used to timely detect and handle this reverse current to protect the electrolytic cell from damage. The current suppression component 12 is externally applied to the electrolytic cell 1. The current suppression component 12 suppresses or reduces the influence of the reverse current on the electrolytic cell 1.

[0026] The nitrogen charging section 4 includes a nitrogen replacement component 41, an oxygen separator 42, a hydrogen separator 43, and a gas-water separator 44. The nitrogen replacement component 41, the oxygen separator 42, the hydrogen separator 43, and the gas-water separator 44 cooperate together to ensure the normal operation of the system and the purity of hydrogen. On one side of the gas-water separator 44, there are a hydrogen outlet 45 and a sampling port 46. The hydrogen outlet leads out the pure hydrogen after gas-water separation. The sampling port 46 samples and analyzes the gas in the gas-water separator 44. There is a backpressure valve 47 between the gas-water separator 44 and the hydrogen outlet 45. The backpressure valve 47 can keep the pressure at the outlet stable. By adjusting its opening degree, the backpressure valve 47 can change the flow area of the fluid, thereby affecting the hydrogen flow rate. There is a stop valve 48 between the gas-water separator 44 and the sampling port 46. The main function of the stop valve 48 is to control and regulate the opening and closing of the sampling port 46. Through the stop valve 48, the on-off of the sampling port 46 can be conveniently controlled.

[0027] At the outlet of the oxygen separator 42, there is an oxygen outlet 49, so that the pure oxygen after separation can be led out through the oxygen outlet 49. At the inlet of the oxygen separator 42, there is a pure water replenishing port 50. By replenishing pure water through the pure water replenishing port 50, the concentration of the electrolyte can be effectively maintained, ensuring the continuity and stability of the electrolysis process. Keeping the electrolyte concentration within an appropriate range reduces the risk of equipment corrosion, thereby extending the service life.

[0028] There is a ball valve 51 between the oxygen separator 42 and the lye circulation pump 2. The ball valve 51 can be used to control the lye flow rate flowing out of the oxygen separator 42. By adjusting the opening degree of the ball valve 51, the precise control of the lye circulation rate can be achieved, thereby optimizing the electrolysis reaction conditions and improving the hydrogen production efficiency. There is a one-way valve 52 between the oxygen-in-hydrogen analyzer 3 and the gas-water separator 44. Ensure the one-way flow of gas and prevent gas backflow.

[0029] Working principle: When the electrolyzer 1 stops operating, the temperature is 85 ± 5 °C. For heat dissipation, the lye circulation pump 2 will still continue to work for a period of time. At this time, the electrochemical reactions on the anode and cathode electrodes stop, and no new product hydrogen and product oxygen will be generated.

[0030] When the oxygen-in-hydrogen analyzer 3 detects that its content is greater than 0.1%, it directly feeds back to the nitrogen charging section 4, and nitrogen is opened for replacement. The backpressure valve 47 is adjusted to 1.6 MPa.

[0031] Nitrogen is connected from the return ports of the oxygen separator 42 and the hydrogen separator 43 to replace most of the dissolved hydrogen and oxygen with nitrogen; when the oxygen-in-hydrogen content is lower than 0.1%, further reduction of the oxygen-in-hydrogen cannot be achieved through replacement. There is still a very small amount of hydrogen and oxygen gas retained in the electrolyte. Along with the lye circulation, due to the galvanic cell reaction, a reverse current is generated.

[0032] At this time, the hydrogen in oxygen analyzer 3 transmits the signal to the suppression current component 12, and the suppression current component 12 then loads a DC power supply with the same magnitude and opposite polarity as the reverse current magnitude according to the reverse current magnitude of the reverse current component 11. As the reverse current component 11 continuously consumes hydrogen and oxygen and hydrogen and oxygen gases continuously precipitate and escape in the alkaline solution, when the oxygen in hydrogen content further decreases to less than 0.02%, the galvanic cell reaction effect at this time is very weak and the reverse current is very low, which will not be sufficient to corrode the electrode. Then stop the nitrogen replacement and turn off the suppression current component 12. The alkaline solution circulation pump 2 automatically stops after the system temperature is lower than 60°C.

[0033] By adding an external suppression current component 12, when the electrolyzer 1 stops producing hydrogen, first pass through the nitrogen filling part to make most of the gases dissolved in the electrolyte escape as soon as possible, and then control the size and start / stop of the suppression current component 12 according to the concentration of hydrogen in oxygen to neutralize the reverse current in the reverse current component 11, thereby minimizing the risk of electrode corrosion.

[0034] Therefore, the present utility model adopts the above-mentioned reverse current suppression system for electrolyzed water, adds a suppression current component outside the electrolyzer, and is provided with different types of valves for protection, improving the stability and working efficiency of the system.

[0035] The above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit it. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions of the present utility model or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present utility model.

Claims

1. An electrolyzed water reverse current suppression system, characterized in that, It includes an electrolytic cell, an alkaline solution circulation pump, an oxygen-in-hydrogen analyzer, and a nitrogen filling part. One side of the alkaline solution circulation pump is connected to the electrolytic cell, the other side of the alkaline solution circulation pump is connected to the nitrogen filling part, and the oxygen-in-hydrogen analyzer is connected to the electrolytic cell; the electrolytic cell includes a reverse current component and a current suppression component, and the current suppression component is externally applied to the electrolytic cell.

2. The reverse current suppression electrolyzed water system according to claim 1, wherein A temperature detection component is provided between the electrolytic cell and the alkaline solution circulation pump.

3. The electrolyzed water reverse current suppression system according to claim 1, wherein The nitrogen filling part includes a nitrogen replacement component, an oxygen separator, a hydrogen separator, and a gas-water separator. There are a hydrogen outlet and a sampling port on one side of the gas-water separator. A back pressure valve is provided between the gas-water separator and the hydrogen outlet, and a stop valve is provided between the gas-water separator and the sampling port.

4. A system for suppressing reverse current of electrolyzed water according to claim 3, wherein, An oxygen outlet is provided at the outlet of the oxygen separator, and a pure water replenishment port is provided at the inlet of the oxygen separator.

5. A reverse current suppression system for electrolyzed water according to claim 3, characterized in that, A ball valve is provided between the oxygen separator and the alkaline solution circulation pump.

6. The electrolytic water reverse current suppression system according to claim 3, wherein A one-way valve is provided between the oxygen-in-hydrogen analyzer and the gas-water separator.

Images