Internal heat exchange type electrolytic bath

Abstract

The utility model discloses an internal heat exchange type electrolytic bath, which comprises coil pole plates positioned in each small chamber, the coil pole plates are fixed in a pole frame, the coil pole plates comprise a disc-shaped structure pipeline formed by bending a metal tube, the upper port of the disc-shaped structure pipeline is a tube side alkali liquor inlet shunting hole, the lower port of the disc-shaped structure pipeline is a tube side alkali liquor outlet converging hole, and the tube side alkali liquor inlet converging hole is communicated with the tube side alkali liquor outlet converging hole. A groove communicated with two ports of the disc-shaped structure pipeline is formed in the pole frame, so that the pipe side alkali liquor inlet shunting hole is communicated with a liquor inlet of the electrolytic bath, and the pipe side alkali liquor outlet converging hole is communicated with a liquor inlet of the small chamber; the coil pole plate is formed by splicing two metal plates which are in mirror symmetry, a groove with one end extending to the other end is formed in one face of each metal plate, and a corresponding protrusion is formed in the position, at the groove, of the other face of each metal plate. According to the internal heat exchange type electrolytic bath, the temperature field distribution in the electrolytic bath is improved, so that the temperature in the whole electrolytic reaction process is more uniform and stable, and the electrolytic reaction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic cell technical field, especially a kind of internal heat exchange type electrolytic cell. BACKGROUND

[0002] Alkaline electrolytic water hydrogen production technology is the most widely used electrolytic water hydrogen production technology at present, with the advantages of low cost, simple equipment, large hydrogen production, stable performance and the like. Alkaline electrolytic water hydrogen production system usually uses 30% KOH solution as electrolyte, under the action of direct current, electrolytic cell produces hydrogen and oxygen. The traditional alkaline electrolytic cell has certain limitations in the electrolysis process, and its internal structure is usually formed by polar plate to form a small chamber, and the diaphragm is arranged on the cathode and anode of the small chamber, and the electrolysis reaction is carried out by using cathode and anode, so as to generate hydrogen and oxygen by electrolysis of water. The supply mode of alkali liquor is generally from the bottom of electrolytic cell, and then to the cavity in the positive plate, and then distributed to the cathode and anode of each small chamber through the channel, and then each small chamber starts electrolysis reaction from bottom to top.

[0003] However, this structure and liquid inlet mode have obvious defects. During the electrolysis reaction, the temperature in the electrolytic cell gradually rises with the continuous reaction, and there is no external heat exchange measure in the whole reaction process, so that the temperature at the outlet of the cathode and anode is about 15℃ higher than that at the inlet of the electrolytic cell, the temperature difference between the inlet and outlet of the electrolytic cell is large, which leads to uneven distribution of the whole reaction temperature. In order to ensure that the outlet temperature of the electrolytic cell is within the safe upper limit range, the inlet temperature of the electrolytic cell must be low, and the low inlet temperature seriously affects the electrolysis efficiency and increases the energy consumption, which is not conducive to the stable and efficient development of electrolysis production. Therefore, a new type of electrolytic cell structure is needed to effectively solve the above problems, optimize the internal temperature field of the electrolytic cell and improve the electrolysis efficiency.

[0004] During the whole electrolysis process, with the continuous deepening of electrolysis reaction from the bottom to the top of the electrolytic cell, the temperature of the alkali liquor rises continuously, and the outlet temperature of the alkali liquor (about 90℃) is 15-20℃ higher than the inlet temperature (about 75℃). The electrolysis efficiency is higher and the energy consumption is lower with the increase of temperature, so the design of the existing electrolytic cell inevitably causes the decrease of electrolysis efficiency and the increase of energy consumption due to the distribution of temperature field, and the temperature imbalance between the top and bottom of the electrolytic cell is also a challenge to the sealing after large-scale. SUMMARY

[0005] The utility model aims at providing an internal heat exchange type electrolytic cell which can improve the temperature field and improve the electrolysis efficiency.

[0006] Technical solution: To achieve the above object, the utility model relates to an internal heat exchange type electrolytic cell, including the coil pipe polar plate in each chamber, the coil pipe polar plate includes the disc structure pipeline by the metal pipe bending constitutes, and the upper end of disc structure pipeline is the tube side lye inlet shunt hole, and is communicated with the liquid inlet of electrolytic cell, and the lower end of disc structure pipeline is the tube side lye outlet convergence hole, and is communicated with the chamber liquid inlet.

[0007] Among them, the coil pipe polar plate is fixed in the polar frame, and the polar frame is provided with a groove in communication with the two ports of the disc structure pipeline.

[0008] Among them, the disc structure pipeline is fixed in the inner ring of the polar frame by clamping two thin plates.

[0009] Among them, the coil pipe polar plate is spliced by two mirror-symmetrical metal plates, one side of the metal plate is provided with a groove extending from one end to the other end, and a corresponding protrusion is formed at the groove on the other side of the metal plate.

[0010] Among them, the adjacent pipeline outer diameters in the disc structure pipeline are connected by welding thin plates.

[0011] Among them, the outermost pipeline outer diameters in the disc structure pipeline are connected with the polar frame by welding thin plates.

[0012] Among them, the disc structure pipeline is a square or circular disc structure formed by bending a steel pipe of 316L material.

[0013] Advantages: The utility model has the advantages that: 1, the internal heat exchange type electrolytic cell significantly improves the temperature field distribution inside the electrolytic cell, makes the temperature in the whole electrolytic reaction process more uniform and stable, avoids the problem of too low inlet temperature caused by too large temperature difference between inlet and outlet, and the efficiency of electrolytic reaction is significantly improved under the stable temperature environment;

[0014] 2, compared with the existing electrolytic cell, the internal heat exchange type electrolytic cell can maintain high-efficiency electrolysis under more reasonable temperature conditions, reduce unnecessary energy consumption, and reduce the energy consumption cost of unit product;

[0015] 3, reduce thermal stress, avoid deformation and rupture of the polar plate, diaphragm and other components of the electrolytic cell, prolong the service life of each component of the electrolytic cell;

[0016] 4, the reduction of temperature difference also makes the running state of the electrolytic cell more stable, which is helpful for the accurate monitoring and control of the production process by the operator, reduces the operation errors and safety hazards caused by temperature fluctuation;

[0017] 5. The optimized temperature difference enables effective control of the outlet temperature of the electrolysis reaction zone, avoiding overheating.

[0018] 6. Improved uniformity of the internal temperature field of the electrolytic cell helps enhance its sealing performance, reduces potential leakage risks, and further ensures that the electrolytic reaction can continue in a safe and stable environment, thereby improving overall production efficiency and equipment reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an existing electrolytic cell structure;

[0020] Figure 2 This is an axial sectional view of the internal heat exchange electrolytic cell described in this utility model;

[0021] Figure 3 This is a front view of the coil electrode plate;

[0022] Figure 4 This is a three-dimensional structural diagram of the coil electrode plate. Detailed Implementation

[0023] The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings.

[0024] like Figure 1 The diagram shows the main structure of an existing electrolytic cell, including an epoxy insulating plate 1, a positive electrode plate 2, electrode plate A3, electrode plate B4, a sealing gasket 5, a cathode nickel mesh 6, a diaphragm 7, an anode nickel mesh 8, a main electrode plate, and an electrode frame. The main electrode plate commonly used is a nipple plate 9, with a spherical uneven structure on its surface. This uneven structure reduces contact resistance and makes the alkali solution distribution more uniform, ultimately reducing energy consumption. The electrode frame is located outside the nipple plate and has a hydrogen-side gas-liquid outlet manifold 12 and an oxygen-side gas-liquid outlet manifold 13. A small chamber alkali solution inlet diversion hole 15 is located at the lower end.

[0025] The internal heat exchange electrolytic cell of this invention replaces the original nipple plate 9 with a coiled electrode plate 10 in the form of a pipe. The structure of the coiled electrode plate 10 is as follows: Figures 2-3 As shown, the coiled electrode 10 is a square or circular disc-shaped structure formed by bending a thin-walled 316L steel pipe. The radius of the steel pipe can be consistent with the original nipple height, thus not changing the original internal spatial structure of the electrolytic cell. The disc-shaped structure is then sandwiched between two thin plates and fixed to the inner ring of the electrode frame. The electrode frame has grooves communicating with the two ends of the disc-shaped structure. The disc-shaped structure exhibits a regular serpentine arrangement, with the bent sections forming multiple parallel arc-shaped structures.

[0026] In practical applications, one port of the disc-shaped structure pipeline is located above the electrolytic cell as the tube-side lye inlet shunt hole 11, which communicates with the liquid inlet of the electrolytic cell, and the other is located below the electrolytic cell as the tube-side lye outlet collecting hole 14.

[0027] After changing the papillary plate 9 in each chamber of the electrolytic cell to the disc tube plate 10, the lye no longer enters from the bottom of the electrolytic cell, but from the top of the electrolytic cell. After the lye passes through the tube-side lye inlet shunt hole 11 at the upper end of each disc tube plate 10, it flows into the disc-shaped structure pipeline. Then the lye flows inside the disc-shaped structure pipeline, exchanges heat in the chamber, and finally flows out from the bottom tube-side lye outlet collecting hole 14. The lye is then distributed to each chamber through the chamber lye inlet shunt hole 15.

[0028] At the same time, the cathode and anode in each chamber begin to undergo electrolysis under the action of the applied electric field, producing hydrogen and oxygen by electrolysis of the lye. The heat generated during the electrolysis process is transferred to the lye flowing in the disc-shaped structure pipeline of the disc tube plate 10. The lye absorbs heat to cool the reaction area, maintaining a near-constant temperature throughout the electrolysis process.

[0029] In this embodiment, further embodiments of the disc tube plate 10 with other component structures are provided. In one embodiment, a metal plate is used as the base material, and a groove extending from one end to the other end is prepared on one side of the metal plate. The other side of the metal plate forms a corresponding protrusion at the groove. By mirroring and combining two sets of metal plates, a disc tube plate 10 is formed, in which the lye enters from one end of the groove and flows out from the other end of the groove, as shown in Figure 4 .

[0030] Another embodiment includes a disc-shaped structure pipeline formed by bending a steel pipe. The adjacent pipeline outer diameters in the disc-shaped structure pipeline are connected by welding a thin plate, finally forming a disc-shaped structure with a disc-shaped structure pipeline inside. This connection method not only fixes the position of the pipeline, but also enhances the stability of the overall structure.

[0031] The design of the above-mentioned disc-shaped structure pipeline has the following advantages: high-efficiency heat exchange, which can increase the flow path length of the fluid in the disc tube plate 10, thereby improving the heat exchange efficiency. When the fluid (such as cooling liquid or heating medium) passes through the disc tube plate 10, it can exchange heat more fully with the disc tube plate 10; uniform distribution, which helps to evenly distribute the fluid in the disc tube plate 10, avoiding local overheating or overcooling, which is very important for maintaining a stable working temperature.

[0032] There are two ports at the edge position of the disc tube plate 10, which are used for the passage of fluid into and out of the disc-shaped structure pipeline. The fluid enters the disc-shaped structure pipeline from the top port, passes through the serpentine path, and then flows out from the bottom port, achieving heat transfer or material exchange.

[0033] The internal heat exchange type electrolytic cell with the above-mentioned coil electrode plate 10 can effectively improve the temperature field distribution in the electrolytic cell, so that the temperature in the whole electrolysis reaction process is more uniform and stable, and the problem of too low inlet temperature caused by too large temperature difference between the inlet and outlet is avoided. Under the stable temperature environment, the efficiency of the electrolysis reaction is significantly improved, the ions participating in the reaction can migrate and react under more suitable temperature conditions, the electrolysis reaction rate on the electrode surface is accelerated, and more hydrogen and oxygen can be produced in the same time, thereby improving the production capacity of the whole electrolytic cell.

[0034] The near-constant temperature reaction environment also helps to reduce energy consumption. Compared with the existing structure which needs to apply additional electric energy to overcome the adverse effects of low temperature on the reaction due to uneven temperature, the internal heat exchange type electrolytic cell can maintain efficient electrolysis under more reasonable temperature conditions, reduces unnecessary energy consumption, reduces the energy consumption cost per unit product, and meets the industrial production requirements of energy saving and emission reduction.

[0035] A larger temperature difference will generate a larger thermal stress in the structure of the electrolytic cell. Thermal stress can cause deformation and rupture of the electrode plate, diaphragm and other components of the electrolytic cell, thereby causing safety accidents such as electrolyte leakage. When the temperature difference is reduced to 7.5℃, the thermal stress is significantly reduced, the service life of each component of the electrolytic cell is prolonged, and the possibility of safety problems caused by structural damage is reduced. The optimized temperature difference enables the outlet temperature of the electrolysis reaction zone to be effectively controlled, avoiding the occurrence of over-temperature phenomenon. In the electrolysis process, too high outlet temperature can cause changes in the properties of hydrogen, oxygen and other electrolysis products, increasing the risk of explosion and other safety risks. Reducing the temperature difference from 15℃ to 7.5℃ can ensure that the outlet temperature remains within a safe range, ensuring the safety of the production process.

[0036] The reduction of temperature difference also makes the running state of the electrolytic cell more stable. Stable running state helps operators accurately monitor and control the production process, reducing operation errors and safety hazards caused by temperature fluctuations. For example, in an automated electrolysis production line, a stable temperature environment can make the control system more reliably operate, avoiding false operation and safety interlock triggering caused by temperature abnormalities.

[0037] In addition, this structure is also more conducive to the sealing of the electrolytic cell. The uniformity of the temperature field of the whole electrolytic cell makes the connection of each part more compact and regular, reducing the potential leakage risk points, helping to maintain a stable pressure environment and reaction atmosphere inside the electrolytic cell, and further ensuring the safety, stability and continuous performance of the electrolysis reaction.

Claims

1. An internal heat exchange type electrolytic cell, comprising coiled electrode plates located in each small chamber, characterized in that, The coil electrode plate includes a disc-shaped structure pipeline formed by bending a metal tube. The upper end of the disc-shaped structure pipeline is a tube-side alkaline solution inlet diversion hole, which is connected to the liquid inlet of the electrolytic cell. The lower end of the disc-shaped structure pipeline is a tube-side alkaline solution outlet manifold hole, which is connected to the liquid inlet of the corresponding chamber. The coil electrode plate is fixed inside the electrode frame, and the electrode frame is provided with grooves that are connected to the two ends of the disc-shaped structure pipeline. The coil electrode plate is spliced ​​together from two mirror-symmetrical metal plates. One side of the metal plate is provided with a groove extending from one end to the other end, and a corresponding protrusion is formed at the groove on the other side of the metal plate.

2. The internal heat exchange electrolytic cell according to claim 1, characterized in that, The disc-shaped pipeline is clamped and fixed to the inner ring of the pole frame by two thin plates.

3. The internal heat exchange electrolytic cell according to claim 1, characterized in that, In the disc-shaped pipeline, the outer diameters of adjacent pipelines are connected by welding thin plates.

4. The internal heat exchange electrolytic cell according to claim 1, characterized in that, The outermost pipe of the disc-shaped pipeline is connected to the pole frame by a welded thin plate.

5. The internal heat exchange electrolytic cell according to claim 1, characterized in that, The disc-shaped pipe is a square or circular disc-shaped structure formed by bending a 316L steel pipe.

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