Long-acting electrolytic bath

Abstract

A long-acting electrolytic bath comprises a left end plate, a right end plate and a temperature sensor for detecting the temperature of the electrolytic bath, a left isolation pad, a left positive plate, a porous sintered titanium plate, a catalyst-free coating film, a porous sintered titanium plate, a negative plate, a porous sintered titanium plate, a catalyst coating film, a porous sintered titanium plate, a right positive plate and a right isolation pad are sequentially stacked between the left end plate and the right end plate from left to right; the positive plate and the negative plate on the left side supply power to the electrolysis unit where the catalyst-free coating film is located; the right positive plate and the right negative plate supply power to the electrolysis unit where the catalyst coating film is located; positive electrode cavities are formed between the left positive plate and the catalyst-free coating films and between the right positive plate and the catalyst coating films, and negative electrode cavities are formed between the catalyst-free coating films and the catalyst coating films; a water inlet and an oxygen outlet in the end plate are connected with the positive electrode cavity, and a hydrogen outlet in the end plate is connected with the negative electrode cavity. According to the utility model, a double-membrane overlapping mode is adopted, so that the service life of the electrolytic bath is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of water electrolysis, and in particular relates to a long-acting electrolytic cell. Background Art

[0002] The core component of the electrolyzer is the electrolytic membrane. Currently, there are generally two types of pure water hydrogen production electrolyzers on the market, one is a catalyst-free membrane electrolyzer, and the other is a catalyst-coated membrane electrolyzer. The coating on the catalyst-coated membrane is a platinum-iridium coating. The price of the catalyst-free membrane electrolyzer is very low, the heat generation is large, and its life is much lower than that of the catalyst-coated membrane electrolyzer, generally around 1000 hours; the catalyst-coated membrane electrolyzer is expensive and has a relatively long operating life, but the operating life of the catalyst-coated membrane electrolyzer is greatly affected by the operating temperature. The optimal operating temperature range of the catalyst-coated membrane electrolyzer is between 75 and 95°C, and it is difficult to reach this temperature in room temperature. Therefore, at the initial startup of the catalyst-coated membrane electrolyzer, the electrolyzer voltage is very high, which causes great damage to the electrolytic membrane. Long-term accumulation greatly reduces the service life of the electrolyzer, and the general life is less than 5000 hours.

[0003] Therefore, how to improve the life of pure water hydrogen production electrolyzer while taking into account the cost of the electrolyzer has significant practical significance. Utility Model Content

[0004] The utility model aims to provide a long-acting electrolytic cell, which combines the characteristics of two electrolytic membranes, a non-catalyst coating membrane and a catalyst coating membrane, and adopts a combined method to increase the service life of the electrolytic cell.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a long-acting electrolytic cell, comprising a left end plate and a right end plate that are fastened together and a temperature sensor for detecting the temperature of the electrolytic cell, and a left isolation pad, a left positive electrode plate, a porous sintered titanium plate, a catalyst-free coating film, a porous sintered titanium plate, a negative electrode plate, a porous sintered titanium plate, a catalyst coating film, a porous sintered titanium plate, a right positive electrode plate and a right isolation pad are sequentially stacked from left to right between the left end plate and the right end plate;

[0006] The left positive electrode plate and the negative electrode plate are used to supply power to the electrolysis unit where the catalyst-free coating membrane is located; the right positive electrode plate and the negative electrode plate are used to supply power to the electrolysis unit where the catalyst coating membrane is located;

[0007] A positive electrode cavity is formed between the left positive electrode plate and the catalyst-free coating membrane and between the right positive electrode plate and the catalyst coating membrane, and a negative electrode cavity is formed between the catalyst-free coating membrane and the catalyst coating membrane; a water inlet and an oxygen outlet of the electrolyzer are connected to the positive electrode cavity, and a hydrogen outlet of the electrolyzer is connected to the negative electrode cavity.

[0008] A sealing ring is arranged around the porous sintered titanium plate.

[0009] The sealing ring is a silicone sealing ring.

[0010] The left isolation pad and the right isolation pad are both polytetrafluoroethylene isolation pads.

[0011] The negative electrode plate is provided with a fixing hole for fixing the temperature sensor.

[0012] The water inlet, oxygen outlet and hydrogen outlet are all arranged on the right end plate or the left end plate.

[0013] The beneficial effects of the utility model are as follows: the combined electrolytic cell of the utility model adopts a double membrane (catalyst-free coating membrane, catalyst-coated membrane) superposition mode, and is respectively provided with an independent electrolysis chamber, a common end plate, a water inlet, an air outlet, and a negative plate, etc., and according to the real-time monitoring of the electrolytic cell temperature by the temperature sensor, when the room temperature is lower than 75 degrees Celsius (generally lower than this temperature), the electrolytic cell side without the catalyst coating membrane is powered on for electrolysis (at this time, the electrolytic cell side has not yet been electrolyzed), and as the electrolytic cell is operated, the temperature of the electrolytic cell gradually increases, and when the temperature sensor on the negative plate detects that the temperature rises to 75°C (generally, it will reach 75°C after 5 to 10 minutes of operation), the voltage supply on the electrolytic cell side without the catalyst coating membrane gradually decreases, and the catalyst coating membrane side starts to supply power, and the voltage gradually increases to a stable voltage (when the temperature is detected to be higher than 90°C, the cooling fan intervenes in the heat dissipation of the electrolytic cell), so that the electrolytic cell works within the optimal operating temperature, so as to greatly extend the service life of the electrolytic cell, and the general service life exceeds 10,000 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the outer side structure of the right end plate of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the electrolytic cell of the utility model;

[0017] Markings in the figure: 1. Right positive plate, 2. Negative plate, 3. Left positive plate, 4. M8 bolt, 5. Left end plate, 6. M5 nut, 7. Temperature sensor, 8. M5 screw, 9. Oxygen outlet, 10. Hydrogen outlet, 11. Right end plate, 12. M8 nut, 13. Water inlet, 14. Non-catalyst coated membrane, 15. Catalyst coated membrane, 16. Porous sintered titanium plate, 17. Right isolation pad, 18. Silicone sealing ring, 19. Left isolation pad. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention in any way.

[0019] See attached Figure 1-3 As shown, a long-acting electrolyzer comprises a left end plate 5, a right positive plate 1, a catalyst-free coating membrane 14, a negative plate 2, a catalyst-free coating membrane 15, a left positive plate 3, a right end plate 11 and a plurality of porous sintered titanium plates 16. A water inlet 13 is provided on the right end plate 11 to provide pure water for electrolysis to the cavity in the electrolyzer, and an oxygen outlet 9 and a hydrogen outlet 10 are also provided on the right end plate 11 to discharge hydrogen and oxygen generated by the electrolysis of pure water. The left positive plate 3, the catalyst-free coating membrane 14, the negative plate 2, the catalyst-free coating membrane 15, the right positive plate 1 and a plurality of porous sintered titanium plates 16 and other structures are stacked between the left end plate 5 and the right end plate 11, and the M8 bolt 4 passes through the left end plate 5 and the right end plate 11, and is fastened with the M8 nut 12.

[0020] The structural stacking sequence between the left end plate 5 and the right end plate 11 is as follows: Figure 3 As shown, from the left end plate 5 to the right end plate 11, there are the left isolation pad 19, the left positive plate 3, the porous sintered titanium plate 16, the catalyst-free coating membrane 14, the porous sintered titanium plate 16, the negative plate 2, the porous sintered titanium plate 16, the catalyst coating membrane 15, the porous sintered titanium plate 16, the right positive plate 1 and the right isolation pad 17, wherein the area of ​​the porous sintered titanium plate 16 is smaller than the area of ​​the end plate and the area of ​​the adjacent structural layer, so a silicone sealing ring 18 is also arranged around each porous sintered titanium plate 16. The left positive plate 3, the right positive plate 1 and the negative plate 2 are provided with a left positive plate terminal 3.1, a right positive plate terminal 1.1 and a negative plate terminal 2.1 for wiring, which are used to power the electrolyzer. The negative plate 2 is also provided with a temperature sensing fixing hole 2.2 for installing the temperature sensor 7. The temperature sensor 7 is installed on the temperature sensing fixing hole 2.2 by using the M5 nut 6 and the M5 screw 8. The left isolation pad 19 and the right isolation pad 17 are both made of polytetrafluoroethylene isolation pads.

[0021] Continue to refer Figure 3 The left and right sides of the first porous sintered titanium plate 16 on the left are in contact with the left positive electrode plate 3 and the catalyst-free coating membrane 14 respectively; the left and right sides of the second porous sintered titanium plate 16 on the left are in contact with the catalyst-free coating membrane 14 and the negative electrode plate 2 respectively; the left and right sides of the first porous sintered titanium plate 16 on the right are in contact with the catalyst coating membrane 15 and the right positive electrode plate 1 respectively; the left and right sides of the second porous sintered titanium plate 16 on the right are in contact with the negative electrode plate 2 and the catalyst coating membrane 15 respectively.

[0022] The temperature sensor 7 is used to detect the temperature of the electrolytic cell. The sampling data controls the working state of the electrolytic cell through the main board. When the temperature is lower than the set value, the non-catalyst coated membrane side works, and when the temperature is higher than the set value, the catalyst coated membrane side starts to work.

[0023] The positive plate 3 and the negative plate 2 on the left are voltage input ports for electrolysis on the side of the catalyst-free membrane 14, as one electrolysis unit. The positive plate 1 and the negative plate 2 on the right are voltage input ports for electrolysis on the side of the catalyst-free membrane 15, as another electrolysis unit. Therefore, the catalyst-free membrane 14 and the catalyst-free membrane 15 are both independent electrolysis units, sharing the negative plate 2.

[0024] The catalyst-free coating membrane 14 does not distinguish between positive and negative electrodes, and the two sides of the membrane are respectively the oxygen side and the hydrogen side. The left and right sides of the catalyst-free coating membrane 14 are respectively the A+ and A- cavities.

[0025] The catalyst coating membrane 15 is divided into positive and negative electrodes, and the two sides of the membrane are respectively the oxygen side and the hydrogen side. The left and right sides of the catalyst coating membrane 15 are respectively the B- and B+ cavities.

[0026] The pure water entering the electrolytic cell is electrolyzed to generate oxygen and hydrogen. The hydrogen penetrates the electrolytic membrane and enters the negative electrode side (A-, B- cavities), and the oxygen enters the positive electrode side (A+, B+ cavities). Therefore, the hydrogen outlet 10 of the right end plate 11 is connected to the A-, B- cavities, and the oxygen outlet 9 is connected to the A+, B+ cavities. The water inlet 13 is connected to the A+, B+ cavities.

[0027] In the above embodiment, the water inlet, oxygen outlet, and hydrogen outlet are all arranged on the right end plate. In other embodiments, the water inlet, oxygen outlet, and hydrogen outlet can also be arranged on the left end plate.

[0028] The working process of the electrolytic cell described in the utility model is described below.

[0029] Pure water enters the A+ and B+ cavities respectively through the water inlet. When the temperature sensor 7 detects that the temperature of the electrolytic cell is lower than 75 degrees Celsius, the positive plate 3 and the negative plate 2 on the left start to supply power, and contact the catalyst-free coating membrane 14 through the porous sintered titanium plate 16. The catalyst-free coating membrane 14 starts to electrolyze pure water to form an electrolysis unit. The oxygen generated by electrolysis is discharged through the oxygen outlet 9 on the right end plate 11, and the hydrogen generated by electrolysis is discharged through the hydrogen outlet 10 on the right end plate 11.

[0030] As the electrolysis continues, the temperature of the electrolytic cell continues to rise. When the temperature sensor 7 detects that the temperature of the electrolytic cell is higher than 75 degrees Celsius, the left positive plate 3 gradually reduces the power supply voltage until the power supply stops. At the same time, the right positive plate 1 starts to supply power, and contacts the catalyst coating membrane 15 through the porous sintered titanium plate 16. The non-catalyst coating membrane 15 starts to electrolyze pure water to form an electrolysis unit. The power supply voltage gradually increases until it increases to the rated value. At this time, the non-catalyst coating membrane 14 has stopped electrolysis, and the catalyst coating membrane 15 is electrolyzing normally.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A long-acting electrolytic cell, comprising a left end plate and a right end plate which are fastened together and a temperature sensor for detecting the temperature of the electrolytic cell, characterized in that: A left isolation pad, a left positive electrode plate, a porous sintered titanium plate, a catalyst-free coating membrane, a porous sintered titanium plate, a negative electrode plate, a porous sintered titanium plate, a catalyst coating membrane, a porous sintered titanium plate, a right positive electrode plate and a right isolation pad are sequentially stacked from left to right between the left end plate and the right end plate; The left positive electrode plate and the negative electrode plate are used to supply power to the electrolysis unit where the catalyst-free coating membrane is located; the right positive electrode plate and the negative electrode plate are used to supply power to the electrolysis unit where the catalyst coating membrane is located; A positive electrode cavity is formed between the left positive electrode plate and the catalyst-free coating membrane and between the right positive electrode plate and the catalyst coating membrane, and a negative electrode cavity is formed between the catalyst-free coating membrane and the catalyst coating membrane; a water inlet and an oxygen outlet of the electrolyzer are connected to the positive electrode cavity, and a hydrogen outlet of the electrolyzer is connected to the negative electrode cavity.

2. The long-acting electrolytic cell according to claim 1, characterized in that: A sealing ring is arranged around the porous sintered titanium plate.

3. The long-acting electrolytic cell according to claim 2, characterized in that: The sealing ring is a silicone sealing ring.

4. The long-acting electrolytic cell according to claim 1, characterized in that: The left isolation pad and the right isolation pad are both polytetrafluoroethylene isolation pads.

5. The long-acting electrolytic cell according to claim 1, characterized in that: The negative electrode plate is provided with a fixing hole for fixing the temperature sensor.

6. The long-acting electrolytic cell according to claim 1, characterized in that: The water inlet, oxygen outlet and hydrogen outlet are all arranged on the right end plate or the left end plate.

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