Alkali liquor heat preservation tank for producing hydrogen by electrolyzing water

Abstract

The utility model relates to an alkali liquor heat preservation tank for producing hydrogen by electrolyzing water. The alkali liquor heat preservation tank comprises an outer tank body, an inner tank body, an outer tank bottom and an inner tank bottom, the outer tank body and the inner tank body are each of a cavity structure with the bottom end opened, an outer tank bottom is arranged at the opening position of the bottom end of the outer tank body, an inner tank bottom is arranged at the opening position of the bottom end of the inner tank body, the inner tank body and the inner tank bottom are arranged in the outer tank body, and the lower surface of the inner tank bottom is connected with the upper surface of the outer tank bottom through a first heat preservation layer. A second heat preservation layer is arranged on the outer surface of the inner tank body, and a vacuum layer is defined by the outer surface of the second heat preservation layer, the inner wall of the outer tank body and the first heat preservation layer. The alkali liquor heat preservation tank has the advantages that the heat preservation structure composed of the heat preservation layer and the vacuum layer is adopted for heat preservation of the storage tank, the heat preservation effect is better, heat loss of the storage tank is reduced, energy is saved, consumption is reduced, the technological requirement for liquid heat preservation is met, and meanwhile high temperature can be isolated. In addition, the heat preservation layer is laid on the outer side of the inner tank body, and construction and assembly are convenient.

Description

Technical Field

[0001] This utility model relates to the field of storage tank insulation technology, and in particular to an alkaline solution insulation tank for hydrogen production by water electrolysis. Background Technology

[0002] Alkali solution is a highly corrosive alkaline chemical and an important basic chemical raw material. It can be used to manufacture formic acid, oxalic acid, and soap, and has wide applications in industries such as textile printing and dyeing, metallurgy, enamel, pharmaceuticals, cosmetics, leather making, coatings, pesticides, glass, and papermaking. It is an essential product in the production of many factories, and the storage of alkali solution is particularly important for production.

[0003] Alkali solutions, due to their high specific heat capacity and thermal conductivity, can rapidly transfer heat from high-temperature areas to low-temperature areas. Alkali solution insulated storage tanks are specialized equipment for storing alkali solutions; maintaining the alkali solution temperature ensures the process temperature for production, allowing for rapid resumption of operation after restarting. The electrolysis of water to produce hydrogen consumes a large amount of electricity to decompose water into hydrogen and oxygen; energy consumption is a significant component of the cost. Currently, the large amount of electricity required for alkaline water electrolysis to produce hydrogen is provided by wind and solar power. The stability of the power supply is relatively poor, leading to a relatively high frequency of system start-ups and shutdowns. After shutdown, the alkali solution in the circulating storage tank dissipates heat rapidly. Without insulation measures, this results in significant heat loss. Upon restarting, a large amount of heat is needed to reheat the alkali solution to the required electrolysis temperature, greatly increasing the system's energy consumption. Therefore, insulating the alkali solution storage tank can reduce energy consumption while ensuring rapid system resumption after restarting. Existing alkali insulated storage tanks include a tank body, a tank top, and a tank bottom. The tank body consists of an inner tank and an outer tank, forming a jacketed space between them. An insulation layer is installed on the inner side of the outer tank within the jacketed space. An air layer is left between the insulation layer and the inner tank. The air layer and the insulation layer thus form a composite double-layer insulation structure, thereby avoiding the impact of high temperature on the outer tank. The defects and shortcomings of existing alkali storage tanks are: (1) The composite insulation structure formed by the air layer and the insulation layer between the inner and outer tanks has poor insulation effect; (2) The insulation layer is laid on the outer tank, which makes construction more difficult.

[0004] Therefore, there is an urgent need to provide an alkaline solution heat preservation tank for hydrogen production by water electrolysis that is simple to construct and has better heat preservation effect. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an alkaline solution heat preservation tank for hydrogen production by water electrolysis, which solves the technical problem of poor heat preservation effect of storage tanks in the prior art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model embodiment provides an alkaline solution heat preservation tank for hydrogen production by water electrolysis, including an outer tank body, an inner tank body, an outer tank bottom, and an inner tank bottom;

[0010] Both the outer tank and the inner tank are open-bottomed cavity structures. The bottom of the outer tank is located at the bottom opening of the outer tank, and the bottom of the inner tank is located at the bottom opening of the inner tank. The inner tank and the inner tank bottom are located inside the outer tank, and the lower surface of the inner tank bottom is connected to the upper surface of the outer tank bottom through a first insulation layer. A second insulation layer is provided on the outer surface of the inner tank. The outer surface of the second insulation layer, the inner wall of the outer tank, and the first insulation layer enclose a vacuum layer.

[0011] Optionally, the alkali solution heat preservation tank also includes a vacuum gauge, vacuum tubes, shut-off valves, and a vacuum unit;

[0012] A vacuum gauge and a vacuum tube connected to the vacuum layer are installed on the outer tank. The vacuum tube is connected to one end of the shut-off valve, and the other end of the shut-off valve is connected to the vacuum unit.

[0013] Optionally, the upper part of the inner tank is provided with a liquid inlet, and the lower part of the inner tank is provided with a liquid outlet. The outer ports of the liquid inlet and the liquid outlet pass through the second insulation layer and the outer tank.

[0014] Optionally, the upper part of the inner tank is provided with an upper liquid level gauge port, and the lower part of the inner tank is provided with a lower liquid level gauge port. The outer ports of the upper liquid level gauge port and the lower liquid level gauge port pass through the second insulation layer and the outer tank.

[0015] The upper and lower level gauge ports are used to install level gauges, which are used to detect the liquid level inside the inner tank.

[0016] Optionally, a base is provided on the lower surface of the outer can bottom.

[0017] Optionally, the first insulation layer is a ceramsite insulation layer, and the second insulation layer is a rock wool insulation layer.

[0018] Optionally, both the inner and outer tank bottoms are made of stainless steel.

[0019] Optionally, the inner tank is made of stainless steel and the outer tank is made of carbon steel.

[0020] Optionally, the top of the inner tank is provided with an air outlet, a vent, and a nitrogen inlet, and the outer ports of the air outlet, vent, and nitrogen inlet pass through the second insulation layer and the outer tank in sequence.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are as follows: The alkaline solution heat-insulating tank for hydrogen production by water electrolysis of this utility model includes an outer tank body, an inner tank body, an outer tank bottom, and an inner tank bottom. Both the outer tank body and the inner tank body are open-bottom cavity structures. The outer tank bottom is located at the bottom opening of the outer tank body, and the inner tank bottom is located at the bottom opening of the inner tank body. The inner tank body and the inner tank bottom are located inside the outer tank body, and the lower surface of the inner tank bottom is connected to the upper surface of the outer tank bottom through a first insulation layer. A second insulation layer is provided on the outer surface of the inner tank body. The outer surface of the second insulation layer, the inner wall of the outer tank body, and the first insulation layer form a vacuum layer. Compared with the prior art, this utility model uses a heat-insulating structure composed of a heat-insulating layer and a vacuum layer to insulate the storage tank, resulting in better heat insulation, reduced heat loss from the storage tank, energy saving and consumption reduction, and meeting the process requirements for liquid heat insulation. At the same time, it can isolate high temperatures. In addition, the insulation layer is laid on the outside of the inner tank, which facilitates construction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the alkaline solution heat preservation tank for hydrogen production by water electrolysis according to this utility model.

[0024] [Explanation of Labels in the Attached Image]

[0025] 1: Outer tank; 2: Inner tank; 31: Bottom of outer tank; 32: Bottom of inner tank; 4: Second insulation layer; 5: Vacuum layer; 6: First insulation layer; 7: Base; 9: Vacuum gauge; 10: Vacuum tube; 11: Shut-off valve; 12: Vacuum unit; 13: Liquid outlet; 14: Liquid inlet; 15: Gas outlet; 16: Vent; 17: Nitrogen inlet; 18: Lower level gauge port; 19: Upper level gauge port. Detailed Implementation

[0026] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 This embodiment provides an alkaline solution heat-insulating tank for hydrogen production by water electrolysis, including an outer tank 1, an inner tank 2, an outer tank bottom 31, and an inner tank bottom 32. Both the outer tank 1 and the inner tank 2 are open-bottom cavity structures. The outer tank bottom 31 is provided at the bottom opening of the outer tank 1, and the inner tank bottom 32 is provided at the bottom opening of the inner tank 2. The inner tank 2 and the inner tank bottom 32 are located inside the outer tank 1, and the lower surface of the inner tank bottom 32 is connected to the upper surface of the outer tank bottom 31 by a first heat-insulating layer 6. A second heat-insulating layer 4 is provided on the outer surface of the inner tank 2. The outer surface of the second heat-insulating layer 4, the inner wall of the outer tank 1, and the first heat-insulating layer 6 enclose a vacuum layer 5.

[0028] The alkali solution heat preservation tank in this embodiment uses a heat preservation structure composed of a heat preservation layer and a vacuum layer to insulate the storage tank. This structure provides better heat preservation, reduces heat loss from the storage tank, saves energy and reduces consumption, meets the process requirements for liquid heat preservation, and also isolates the tank from high temperatures. Furthermore, the heat preservation layer is laid on the outside of the inner tank body 2, facilitating construction.

[0029] Preferably, in this embodiment, the inner tank 2 is a stainless steel tank that is resistant to high temperature and corrosion and can withstand liquid static pressure, so as to provide sufficient rigidity and ensure the stability and safety of each part; the outer tank 1 does not need to withstand liquid static pressure, but only serves as a protective layer, and can be made of ordinary carbon steel.

[0030] Preferably, both the outer tank bottom 31 and the inner tank bottom 32 are stainless steel tank bottoms to provide sufficient rigidity.

[0031] Preferably, the first insulation layer 6 is a ceramsite insulation layer, and the second insulation layer 4 is a rock wool insulation layer.

[0032] In this embodiment, the alkali solution heat preservation tank also includes a vacuum gauge 9, a vacuum tube 10, a shut-off valve 11, and a vacuum unit 12. The outer tank body 1 is equipped with a vacuum gauge 9 and a vacuum tube 10 that communicate with the vacuum layer 5. The vacuum tube 10 is connected to one end of the shut-off valve 11, and the other end of the shut-off valve 11 is connected to the vacuum unit 12. The vacuum gauge 9 is used to detect the vacuum level of the vacuum layer 5, the shut-off valve 11 is used to control the opening and closing of the vacuum tube 10, and the vacuum unit 12 is used to adjust the vacuum level within the vacuum layer 5 to improve the heat preservation performance of the alkali solution heat preservation tank and maintain the liquid temperature.

[0033] In this embodiment, the upper part of the inner tank 2 is provided with a liquid inlet 14 and an upper liquid level gauge port 19, and the lower part of the inner tank 2 is provided with a liquid outlet 13 and a lower liquid level gauge port 18. The outer ports of the liquid inlet 14, the upper liquid level gauge port 19, the liquid outlet 13, and the lower liquid level gauge port 18 pass through the second insulation layer 4 and the outer tank 1 in sequence. The upper liquid level gauge port 19 and the lower liquid level gauge port 18 are used to install liquid level gauges, which are used to detect the liquid level in the inner tank 2. In use, the alkali solution enters the alkali solution insulation tank from the liquid inlet 14 and exits the alkali solution insulation tank through the liquid outlet 13.

[0034] Preferably, the top of the inner tank 2 is provided with an outlet 15, a vent 16, and a nitrogen inlet 17, the outer ports of which pass through the second insulation layer 4 and the outer tank 1 in sequence. Since the alkaline solution is mixed with other gases such as H2 and O2, nitrogen gas is introduced to reduce the gas concentration, decrease the probability of explosion of easily explosive substances, and ensure safety. The nitrogen gas enters through the nitrogen inlet 17 and exits through the outlet 15. The vent 16 is used to discharge the gas inside the storage tank to ensure pressure balance inside the tank.

[0035] In this embodiment, a base 7 is provided on the lower surface of the outer can bottom 31.

[0036] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An alkaline solution heat preservation tank for hydrogen production by water electrolysis, characterized in that: It includes an outer tank (1), an inner tank (2), an outer tank bottom (31), and an inner tank bottom (32); Both the outer tank (1) and the inner tank (2) are open-bottom cavity structures. The bottom of the outer tank (1) is provided with an outer tank bottom (31), and the bottom of the inner tank (2) is provided with an inner tank bottom (32). The inner tank (2) and the inner tank bottom (32) are located inside the outer tank (1). The lower surface of the inner tank bottom (32) and the upper surface of the outer tank bottom (31) are connected by a first insulation layer (6). The outer surface of the inner tank (2) is provided with a second insulation layer (4). The outer surface of the second insulation layer (4), the inner wall of the outer tank (1), and the first insulation layer (6) enclose a vacuum layer (5).

2. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 1, characterized in that: The alkaline solution heat preservation tank also includes a vacuum gauge (9), a vacuum tube (10), a shut-off valve (11), and a vacuum unit (12); A vacuum gauge (9) and a vacuum tube (10) connected to the vacuum layer (5) are installed on the outer tank (1). The vacuum tube (10) is connected to one end of the shut-off valve (11), and the other end of the shut-off valve (11) is connected to the vacuum unit (12).

3. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 1, characterized in that: The inner tank (2) has an inlet (14) at the top and an outlet (13) at the bottom. The outer ports of the inlet (14) and outlet (13) pass through the second insulation layer (4) and the outer tank (1).

4. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 3, characterized in that: The upper part of the inner tank (2) is provided with an upper liquid level gauge port (19), and the lower part of the inner tank (2) is provided with a lower liquid level gauge port (18). The outer ports of the upper liquid level gauge port (19) and the lower liquid level gauge port (18) pass through the second insulation layer (4) and the outer tank (1). The upper level gauge port (19) and the lower level gauge port (18) are used to install level gauges, which are used to detect the level of liquid in the inner tank (2).

5. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in any one of claims 1-4, characterized in that: A base (7) is provided on the lower surface of the bottom (31) of the outer can.

6. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 1, characterized in that: The first insulation layer (6) is a clay insulation layer, and the second insulation layer (4) is a rock wool insulation layer.

7. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 1, characterized in that: Both the outer tank bottom (31) and the inner tank bottom (32) are stainless steel tank bottoms.

8. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in claim 7, characterized in that: The inner tank (2) is a stainless steel tank, and the outer tank (1) is a carbon steel tank.

9. The alkaline solution heat preservation tank for hydrogen production by water electrolysis as described in any one of claims 1-8, characterized in that: The top of the inner tank (2) is provided with an air outlet (15), a vent (16) and a nitrogen inlet (17), and the outer ports of the air outlet (15), the vent (16) and the nitrogen inlet (17) pass through the second insulation layer (4) and the outer tank (1) in sequence.

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