Alkali liquor circulating system for alkaline electrolytic bath

Abstract

The utility model discloses an alkali liquor circulation system for an alkali electrolytic bath, which comprises an alkali liquor circulation tank, an alkali preparation pipeline, an alkali removal pipeline, a circulation pipeline, a first alkali preparation valve, an alkali preparation pump, a second alkali preparation valve, a third alkali preparation valve, an alkali removal valve and a circulation valve, the alkali liquor outlet is provided with an alkali preparation pipeline connected with an alkali electrolytic bath, the alkali preparation pipeline is sequentially provided with a first alkali preparation valve, an alkali preparation pump, a second alkali preparation valve and a third alkali preparation valve, the alkali preparation pipeline is provided with an alkali removal valve, and the alkali preparation pipeline is connected with the alkali liquor inlet through a circulating pipeline. The alkali liquor circulating system has the advantages that the alkali liquor circulating system can provide alkali liquor for the high-power alkali electrolytic bath and can also recover the alkali liquor from the alkali electrolytic bath; and an alkali preparation pump is used for internal circulation of alkali liquor in the system to complete full dissolution, so that the use and maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cells, in particular to an alkaline solution circulation system for an alkaline electrolytic cell. Background Art

[0002] As a high calorific value, clean and pollution-free energy, hydrogen has a place in the new energy industry. There are many ways to produce hydrogen, among which water electrolysis is the most important technology for producing high-purity hydrogen. The mainstream technologies for water electrolysis include alkaline water electrolysis, proton exchange membrane water electrolysis and solid oxide water electrolysis. Among them, alkaline water electrolysis is the longest-developed and most mature hydrogen production technology in the industry. This method has simple equipment, easy operation, and has been commercialized.

[0003] At present, the application of alkaline electrolyzers in the market is relatively mature, and the demand and scale are constantly expanding. The demand and scale of the corresponding alkali solution supply and alkali preparation equipment are also increasing year by year. At present, an alkali solution buffer tank is often set up in the entire hydrogen production system. The prepared alkali solution from the outside is pumped into the buffer tank and then enters the alkaline electrolyzer. However, such a setting can only meet the alkali preparation requirements, but cannot recover the alkali solution in the alkaline electrolyzer, which increases the load in the system. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to satisfy both alkali preparation and alkali removal.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A alkali solution circulation system for an alkaline electrolytic cell comprises an alkali solution circulation tank, an alkali distribution pipeline, an alkali withdrawal pipeline, a circulation pipeline, a first alkali distribution valve, an alkali distribution pump, a second alkali distribution valve, a third alkali distribution valve, an alkali withdrawal valve and a circulation valve. The alkali solution circulation tank is provided with a water supply port, a caustic soda flake inlet, an alkali solution outlet and an alkali solution inlet. The alkali solution outlet is provided with an alkali distribution pipeline connected to the alkaline electrolytic cell. The alkali distribution pipeline is provided with a first alkali distribution valve, an alkali distribution pump, a second alkali distribution valve and a third alkali distribution valve in sequence. The alkali distribution pipeline between the first alkali distribution valve and the alkali distribution pump and the alkali distribution pipeline between the second alkali distribution valve and the third alkali distribution valve are also connected in parallel with an alkali withdrawal pipeline. The alkali withdrawal pipeline is provided with an alkali withdrawal valve. The alkali distribution pipeline between the alkali distribution pump and the second alkali distribution valve is also connected to the alkali solution inlet via a circulation pipeline. The circulation pipeline is provided with a circulation valve.

[0007] The alkali solution circulation system can provide alkali solution for high-power alkaline electrolytic cells and can also recycle alkali solution from alkaline electrolytic cells. In addition, the alkali preparation process does not use traditional stirring equipment, but uses an alkali preparation pump to circulate the alkali solution within the system to achieve full dissolution, which can reduce the cost of use and maintenance.

[0008] Preferably, a filter is also provided on the alkali preparation pipeline between the alkali withdrawal pipeline and the alkali preparation pump.

[0009] Preferably, the alkali distribution pipeline is connected to the alkaline electrolytic cell via a metal hose.

[0010] Preferably, the circulation pipeline is also provided with a drain port.

[0011] Preferably, the alkali solution circulation tank is provided with a plurality of alkali solution sampling ports.

[0012] Preferably, it also includes a base, and the alkali solution circulation tank, alkali preparation pipeline, alkali withdrawal pipeline, circulation pipeline, alkali preparation pump, and filter are all fixed on the base.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The alkali solution circulation system can provide alkali solution for high-power alkaline electrolytic cells and can also recycle alkali solution from alkaline electrolytic cells. In addition, the alkali preparation process does not use traditional stirring equipment, but uses an alkali preparation pump to circulate the alkali solution within the system to achieve full dissolution, which can reduce the cost of use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0016] Figure 2 The figure is a working principle diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] In order to facilitate those skilled in the art to understand the technical solution of the utility model, the technical solution of the utility model is further explained in conjunction with the drawings in the specification.

[0018] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0019] In this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0020] See also Figure 1 and Figure 2 The present embodiment discloses an alkali solution circulation system for an alkaline electrolytic cell, comprising an alkali solution circulation tank 1, an alkali preparation pipeline 2, an alkali withdrawal pipeline 3, a circulation pipeline 4, a first alkali preparation valve 5, an alkali preparation pump 6, a second alkali preparation valve 7, a third alkali preparation valve 8, an alkali withdrawal valve 9, a circulation valve 10, a filter 11 and a metal hose 12. The alkali solution circulation tank 1 is provided with a water supply port 101, a caustic soda flake inlet 102, an alkali solution outlet 103 and an alkali solution inlet 104. The water supply port 101 is used to supply water to the alkali solution circulation tank 1, the alkali flake inlet 102 is used to supply alkali flakes into the alkali solution circulation tank 1, and the alkali solution outlet 103 is used to output alkali solution.

[0021] The alkali solution outlet 103 is provided with an alkali preparation pipeline 2 connected to the alkaline electrolytic cell 13. Specifically, the output end of the alkali preparation pipeline 2 is detachably connected to the alkaline electrolytic cell 13 through a metal hose 12; the alkali preparation pipeline 2 is sequentially provided with a first alkali preparation valve 5, an alkali preparation pump 6, a second alkali preparation valve 7 and a third alkali preparation valve 8. The alkali preparation pipeline 2 between the first alkali preparation valve 5 and the alkali preparation pump 6 and the alkali preparation pipeline 2 between the second alkali preparation valve 7 and the third alkali preparation valve 8 are also connected in parallel with an alkali withdrawal pipeline 3, and an alkali withdrawal valve 9 is provided on the alkali withdrawal pipeline 3. The alkali preparation pipeline 2 between the alkali preparation pump 6 and the second alkali preparation valve 7 is also connected to the alkali solution inlet 104 through a circulation pipeline 4, and a circulation valve 10 is provided on the circulation pipeline 4.

[0022] The filter 11 is arranged on the alkali preparation pipeline 1 between the alkali withdrawal pipeline 3 and the alkali preparation pump 6, and is used to filter and remove impurities in the alkali solution.

[0023] Furthermore, the alkali solution circulation tank 1 is provided with a plurality of alkali solution sampling ports 105 for sampling the alkali solution.

[0024] Furthermore, the circulation pipeline 4 is also provided with a drain port 401 .

[0025] Furthermore, it also includes a base 14, and the alkali solution circulation tank 1, alkali preparation pipeline 2, alkali withdrawal pipeline 3, circulation pipeline 4, alkali preparation pump 6, and filter 11 are all fixed on the base 14. The above pipelines and equipment are integrated on the base 14 to form a skid-mounted system, which improves the flexibility of the alkali preparation and alkali withdrawal processes and is also convenient for installation and transportation.

[0026] The working principle of this embodiment is:

[0027] Alkali preparation process: add the bagged caustic soda flakes into the alkali solution circulation tank 1 through the caustic soda flake inlet 101, and add a certain amount of deionized water into the alkali solution circulation tank 1 through the water supply port 101 according to the alkali solution concentration to be configured as required; then open the first alkali preparation valve 5 and the circulation valve 10, and ensure that other valves are in a closed state, and by opening the alkali preparation pump 6, the alkali solution in the alkali solution circulation tank 1 circulates into the alkali solution circulation tank 1 through the first alkali preparation valve 5, the filter 11, the alkali preparation pump 6, the circulation valve 10 and the alkali solution inlet 104, and circulates within the system to fully dissolve the caustic soda flakes; after the alkali solution is fully dissolved, open the second alkali preparation valve 7 and the third alkali preparation valve 8, and close the circulation valve 10, and the alkali solution enters the alkaline electrolytic cell 13 through the first alkali preparation valve 5, the filter 11, the alkali preparation pump 6, the second alkali preparation valve 7, the third alkali preparation valve 8, and the metal hose 12 in sequence, and the alkali preparation is completed after the alkali solution volume required by the alkaline electrolytic cell 13 is reached.

[0028] It should be noted that after the alkali preparation is completed, the third alkali preparation valve 8 is closed, and the metal hose 12 can be removed at this time. The excess alkali solution can be retained in the alkali solution circulation tank 1, or discharged into a specific container through the drain port 401 for unified treatment.

[0029] Alkali withdrawal process: when it is necessary to recover alkali from the alkali electrolytic cell 13, open the third alkali preparation valve 8, the alkali withdrawal valve 9, and the circulation valve 10, and ensure that other valves are in a closed state. By opening the alkali preparation pump 6, the alkali in the alkali electrolytic cell 13 is collected in the alkali circulation tank 1 through the metal hose 12, the third alkali preparation valve 8, the alkali withdrawal valve 9, the filter 11, the alkali preparation pump 6, the circulation valve 10, and the alkali inlet 104 in turn; when all the alkali in the alkaline electrolytic cell 13 is withdrawn to the alkali circulation tank 1, close the third alkali preparation valve 8, the alkali withdrawal valve 9, the alkali preparation pump 6, and the circulation valve 10 to complete the alkali withdrawal.

[0030] It should be noted that if the waste alkali in the alkali liquid circulation tank 1 needs to be treated uniformly, the root valve of the first alkali preparation valve 5 and the drain port 401 can be opened, and the alkali liquid is discharged through the first alkali preparation valve 5, the filter 11, the alkali preparation pump 6, the circulation valve 10, and the drain port 401 in sequence.

[0031] The alkali solution circulation system can provide alkali solution for the high-power alkaline electrolytic cell and can also recycle the alkali solution from the alkaline electrolytic cell; and the alkali preparation process does not use traditional stirring equipment, but uses the alkali preparation pump 6 to circulate the alkali solution in the system to achieve full dissolution, which can reduce the use and maintenance costs.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0033] The above-described embodiments merely represent implementation methods of the utility model, and the protection scope of the utility model is not limited to the above-described embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the utility model, and all of these belong to the protection scope of the utility model.

Claims

1. An alkali solution circulation system for an alkaline electrolytic cell, characterized in that: The invention comprises an alkali solution circulation tank, an alkali distribution pipeline, an alkali withdrawal pipeline, a circulation pipeline, a first alkali distribution valve, an alkali distribution pump, a second alkali distribution valve, a third alkali distribution valve, an alkali withdrawal valve and a circulation valve. The alkali solution circulation tank is provided with a water supply port, a caustic soda flake inlet, an alkali solution outlet and an alkali solution inlet. The alkali solution outlet is provided with an alkali distribution pipeline connected to an alkaline electrolytic cell. The alkali distribution pipeline is provided with a first alkali distribution valve, an alkali distribution pump, a second alkali distribution valve and a third alkali distribution valve in sequence. The alkali distribution pipeline between the first alkali distribution valve and the alkali distribution pump and the alkali distribution pipeline between the second alkali distribution valve and the third alkali distribution valve are also connected in parallel with an alkali withdrawal pipeline. The alkali withdrawal pipeline is provided with an alkali withdrawal valve. The alkali distribution pipeline between the alkali distribution pump and the second alkali distribution valve is also connected to the alkali solution inlet through a circulation pipeline. The circulation pipeline is provided with a circulation valve.

2. The alkali solution circulation system for an alkaline electrolytic cell according to claim 1, characterized in that: A filter is also provided on the alkali preparation pipeline between the alkali withdrawal pipeline and the alkali preparation pump.

3. The alkali solution circulation system for an alkaline electrolytic cell according to claim 1, characterized in that: The alkali distribution pipeline is connected to the alkaline electrolytic cell through a metal hose.

4. The alkali solution circulation system for an alkaline electrolytic cell according to claim 1, characterized in that: The circulation pipeline is also provided with a drain port.

5. The alkali solution circulation system for an alkaline electrolytic cell according to claim 1, characterized in that: The alkali solution circulation tank is provided with a plurality of alkali solution sampling ports.

6. The alkali solution circulation system for an alkaline electrolytic cell according to claim 1, characterized in that: It also comprises a base, and the alkali solution circulation tank, alkali preparation pipeline, alkali withdrawal pipeline, circulation pipeline, alkali preparation pump and filter are all fixed on the base.

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