An oxygen-enriched water tank for a hydrogen production system by electrolysis of water

Abstract

The utility model discloses a kind of oxygen-boosting water tank in electrolytic water hydrogen production system, it is related to electrolytic water hydrogen production technical field, including water tank main body and oxygen-boosting coil, oxygen generated in electrolytic water hydrogen production system is connected with the oxygen-boosting coil in water tank main body through communication pipeline.Oxygen generated by system part is flowed to oxygen-boosting water tank under the control of pressure-reducing valve and flowmeter, oxygen is uniformly and continuously released into water tank through oxygen-boosting coil in water tank, nitrogen dissolved in water is replaced by the high solubility of oxygen in water;Oxygen replaces nitrogen in water mainly by using the solubility difference between oxygen and nitrogen, under the same temperature and pressure, the solubility of oxygen is higher than that of nitrogen, so oxygen gradually replaces nitrogen in water by passing into oxygen into water, so as to achieve the purpose of replacement, under the requirement of high-purity hydrogen, oxygen-boosting treatment is carried out on raw material water for electrolysis, nitrogen content in raw material water is reduced, and gas purity is ensured.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen production technology through water electrolysis, and in particular to an oxygen-generating water tank used in a water electrolysis hydrogen production system. Background Technology

[0002] An effective way to address the intermittency and volatility of renewable energy is to combine renewable energy electricity with water electrolysis technology to produce high-purity hydrogen and oxygen. The resulting gases can be used directly or converted into electricity, thereby increasing the utilization rate and proportion of renewable energy.

[0003] The electronics industry requires extremely high purity hydrogen, with a high impurity content. Electrolysis of water provides the conditions for producing high-purity hydrogen, but the nitrogen dissolved in the raw water is a problem that cannot be solved in the electrolysis process. Therefore, how to reduce the nitrogen content in the raw water is an urgent problem to be solved. Utility Model Content

[0004] The purpose of this invention is to provide an oxygenation tank for a water electrolysis hydrogen production system, in order to solve the problems existing in the prior art, to perform oxygenation treatment on the raw water for electrolysis, reduce the nitrogen content in the raw water, and ensure gas purity.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides an oxygenation tank for a water electrolysis hydrogen production system, comprising a tank body and an oxygenation coil, wherein the oxygen generated in the water electrolysis hydrogen production system is connected to the oxygenation coil disposed in the tank body via a connecting pipeline.

[0006] In one embodiment, the water tank contains electrolytic raw water for the water electrolysis hydrogen production system.

[0007] In one embodiment, a pure water inlet is provided on the top of the water tank body. The pure water inlet is connected to the water source of the electrolysis raw material in the water electrolysis hydrogen production system. The pure water inlet is used to replenish water to the water tank body.

[0008] In one embodiment, the water tank body is provided with a cleaning port, which is connected to a cleaning water source via a pipeline.

[0009] In one embodiment, the main body of the water tank is a vertical water tank, and the oxygenation coil is located at the bottom of the vertical water tank.

[0010] In one embodiment, the vertical water tank is provided with a high level gauge and a low level gauge from top to bottom, and the low level gauge is positioned horizontally below the oxygenation coil.

[0011] In one embodiment, the water tank body is provided with an outlet and a connecting port at intervals below the aeration coil.

[0012] In one embodiment, the oxygenation coil includes an oxygenation port and a main pipe, one end of which is connected to the oxygenation port, which extends out of the outside of the water tank body and is connected to the connecting pipe.

[0013] In one embodiment, the oxygen coil further includes several branch pipes, with the branch pipes symmetrically connected to both sides of the main pipe, and exhaust holes are provided at equal intervals on the branch pipes.

[0014] In one embodiment, the water tank body is provided with several reinforcing ribs, and the oxygenation coil is mounted on the reinforcing ribs.

[0015] The present invention achieves the following beneficial technical effects compared to the prior art: The oxygen-generating tank in this invention for a water electrolysis hydrogen production system includes a tank body and an oxygen-generating coil. Oxygen generated in the system is connected to the oxygen-generating coil within the tank body via a connecting pipe. A portion of the oxygen generated flows into the oxygen-generating tank under the control of a pressure reducing valve and a flow meter. Within the tank, the oxygen is evenly and continuously released into the water through the oxygen-generating coil. Utilizing the high solubility of oxygen in water, dissolved nitrogen is displaced. This oxygen displacement primarily leverages the difference in solubility between oxygen and nitrogen. At the same temperature and pressure, oxygen has a higher solubility than nitrogen. Therefore, by introducing oxygen into the water, it gradually replaces the nitrogen, achieving the displacement purpose. When high-purity hydrogen is required, oxygenation of the raw water for electrolysis reduces the nitrogen content and ensures gas purity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a diagram showing the overall structural layout of the oxygenation tank. Figure 2 This is a top view of the oxygenation tank; Figure 3 A schematic diagram of the overall structure of the oxygen coil; Figure 4 for Figure 3 Enlarged view of point I in the image; Among them, a) cleaning port; b) pure water inlet; c) water outlet; d) connecting port; e) sewage outlet; f1) high level gauge port; f2) low level gauge port; g) vent port; h) oxygen inlet; j) reinforcing rib. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide an oxygenation tank for a water electrolysis hydrogen production system, in order to solve the problems existing in the prior art, to perform oxygenation treatment on the raw water for electrolysis, reduce the nitrogen content in the raw water, and ensure gas purity.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-4 As shown, this utility model provides an oxygen-generating tank for a water electrolysis hydrogen production system, including a tank body and an oxygen-generating coil. The oxygen generated in the water electrolysis hydrogen production system is connected to the oxygen-generating coil installed in the tank body through a connecting pipe.

[0022] A portion of the oxygen generated by the system flows down to the oxygenation tank under the control of a pressure reducing valve and flow meter on the connecting pipeline. Inside the tank, the oxygen is evenly and continuously released into the inner cavity through the oxygenation coil. Taking advantage of the high solubility of oxygen in water, dissolved nitrogen is displaced. The oxygen replacement of nitrogen in water mainly utilizes the difference in solubility between oxygen and nitrogen. At the same temperature and pressure, oxygen is more soluble than nitrogen. Therefore, by introducing oxygen into the water, it gradually replaces the nitrogen, achieving the purpose of replacement. When high-purity hydrogen is required, oxygenation treatment is applied to the raw water for electrolysis to reduce the nitrogen content and ensure gas purity.

[0023] In one embodiment, the main body of the water tank contains the electrolytic raw water for the water electrolysis hydrogen production system. While water electrolysis provides the conditions for producing high-purity hydrogen, the dissolved nitrogen in the raw water is a problem that cannot be solved in the electrolysis process. Therefore, to meet the requirement of high-purity hydrogen, the raw water for electrolysis is subjected to oxygenation treatment to reduce the nitrogen content and ensure gas purity. The oxygenated raw water then flows out of the oxygenation tank through outlet c for use in water electrolysis hydrogen production.

[0024] In one embodiment, a pure water inlet b is provided on the top of the water tank body. The pure water inlet b is connected to the electrolysis raw material water source in the water electrolysis hydrogen production system. The pure water inlet b is used to replenish water to the water tank body.

[0025] In one embodiment, the water tank body has a cleaning port a, which is connected to a cleaning water source via a pipe; the bottom of the water tank body has a drain port e. During the working intervals of the aeration tank, when cleaning is required, the drain port e, the outlet c, and the connecting port d are closed, and cleaning fluid is filled into the water tank through the cleaning port a at the top of the water tank body to clean the aeration tank. After cleaning, the drain port e at the bottom of the water tank body is opened to discharge wastewater. During normal aeration operation, both the cleaning port a and the drain port e are closed.

[0026] In one embodiment, the water tank body is a vertical water tank, with the aeration coil installed at the bottom of the vertical water tank. A high-level gauge (f1) and a low-level gauge (f2) are respectively installed on the vertical water tank from top to bottom, with the low-level gauge (f2) positioned horizontally below the level of the aeration coil. By setting the high and low levels in the vertical water tank, oxygen can be in sufficient contact with the water for a longer period, increasing the dissolved oxygen rate and effectively displacing nitrogen from the water, achieving the effect of oxygen replacing nitrogen.

[0027] Meanwhile, a high level gauge port f1 and a low level gauge port f2 are installed on the oxygenation tank. The upper and lower contacts on the level gauges are located at the high level gauge port f1 and the low level gauge port f2, respectively. When the tank is at a low level, the oxygenation tank is automatically replenished with water through the pure water inlet b; when the tank is at a high level, the water replenishment stops.

[0028] In one embodiment, an outlet c and a connecting port d are provided at intervals on the main body of the water tank below the aeration coil; a vent g is also provided on the top of the main body of the water tank.

[0029] The function of the connecting port d is to connect the alkali tank and the oxygen pumping water tank together. When the hydrogen production system needs to remove alkali, the connecting port d can connect the oxygen pumping water tank and the alkali tank in series to hold and preserve the alkali in the system, reducing the discharge of alkali due to insufficient tank volume. The oxygen pumping water tank is equipped with a vent port g to prevent oxygen from accumulating in the oxygen pumping water tank and causing the pressure inside the tank to rise.

[0030] In one embodiment, the oxygenation coil includes an oxygenation port h and a main pipe. One end of the main pipe is connected to the oxygenation port h, which extends out of the water tank body and is connected to a connecting pipe. The oxygenation coil also includes several branch pipes, with branch pipes symmetrically connected to both sides of the main pipe. Vent holes are evenly spaced on the branch pipes. Oxygen from the water electrolysis hydrogen production system, after being depressurized, enters the oxygenation tank through the oxygenation port h. The main pipe inside the tank is connected to the oxygenation port h, and branch pipes are constructed around the main pipe. Oxygen is evenly discharged from the bottom of the tank through these branch pipes, replacing nitrogen in the water.

[0031] Multiple branch pipes are connected in parallel on both sides of the main pipe. Vent holes are opened at 2mm intervals on the branch pipes. After oxygen enters the branch pipes from the main pipe, it is discharged through the vent holes on each branch pipe, ensuring that oxygen can fully replace nitrogen in the water tank.

[0032] In one embodiment, the water tank body is provided with several reinforcing ribs j, and the aeration coil is mounted on the reinforcing ribs j. Figure 3 As shown, two reinforcing ribs j are symmetrically arranged inside the oxygenation tank, and the branch pipes on both sides of the main pipe are respectively mounted on the reinforcing ribs j on both sides.

[0033] In the process of producing hydrogen through water electrolysis, the byproduct oxygen is directly emitted into the atmosphere without being collected, resulting in a waste of resources. This invention recovers the oxygen and discharges it into an oxygen tank to replace the nitrogen in the raw water for water electrolysis. This solves the problem of nitrogen remaining in the hydrogen produced by water electrolysis, providing high-purity hydrogen with low impurity content for places that require high-purity hydrogen.

[0034] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

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