Efficient and stable flat tube type device for producing hydrogen by electrolyzing seawater through solid oxide stack

Abstract

The utility model discloses an efficient and stable device for producing hydrogen by electrolyzing seawater through a flat tube type solid oxide electric pile, and relates to the technical field of seawater hydrogen production. The efficient and stable flat tube type solid oxide stack seawater electrolysis hydrogen production device comprises two sets of mounting blocks and an electrolysis mechanism, and two sets of collector plates are arranged on the adjacent sides of the two sets of mounting blocks; the electrolysis mechanisms are arranged on the two sides of the mounting blocks, each electrolysis mechanism comprises a connecting block, an air inlet box and a fuel electrode air cavity, the two sides of the two mounting blocks are each fixedly provided with one connecting block, one side of each connecting block is provided with the fuel electrode air cavity, and one side of one connecting block and one side of the other connecting block are each fixedly provided with one air inlet box. Air introduction is not needed, air cavity packaging is avoided, the device is completely exposed in the resistance furnace, energy loss caused by air heating is reduced, electrolysis energy efficiency is improved, air is prevented from carrying a large amount of heat, it is guaranteed that the temperature of a battery assembly is uniform, mass transfer resistance is reduced, and seawater electrolysis hydrogen production is more efficient and stable.

Description

Technical Field

[0001] This utility model relates to the field of seawater hydrogen production technology, and in particular to a high-efficiency and stable flat-tube solid oxide stack electrolysis seawater hydrogen production device. Background Technology

[0002] Electrolysis of water to produce hydrogen is an important means of future renewable energy conversion and storage. Currently, the electrolysis of fresh water has been widely used, but the earth's freshwater reserves account for only about 2.5%, while seawater reserves are abundant and are a natural electrolysis raw material. Therefore, vigorously developing seawater electrolysis to produce hydrogen, combined with the abundant offshore power resources in China's coastal areas, can realize large-scale green hydrogen production.

[0003] Solid oxide fuel cell stacks are a green and efficient way to produce hydrogen by electrolyzing seawater. During the operation of solid oxide fuel cell stacks, a large amount of air is usually used to purge the stack to balance the oxygen partial pressure on the air side and alleviate the stack decay.

[0004] However, air does not participate in the steam electrolysis reaction. On the contrary, the introduction of air increases the energy loss caused by heating the air, which reduces the electrolysis efficiency. At the same time, the air carries away a large amount of heat, which exacerbates the endothermic reaction when operating below the thermal neutral voltage, causing a temperature gradient in the fuel cell stack and increasing the mass transfer resistance. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency and stable flat-tube solid oxide fuel cell stack for seawater electrolysis to produce hydrogen. This invention can solve the problems of energy loss caused by increased heating of air due to air introduction, which reduces electrolysis efficiency. At the same time, the air carries a large amount of heat, which exacerbates the endothermic reaction caused by the operation below the thermal neutral voltage, resulting in a temperature gradient in the fuel cell stack and increasing mass transfer resistance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency and stable flat-tube solid oxide fuel cell stack seawater electrolysis hydrogen production device, comprising mounting blocks and an electrolysis mechanism. The mounting blocks include two sets, with two sets of current collectors arranged on adjacent sides of the two sets of mounting blocks. The electrolysis mechanism is arranged on both sides of the mounting blocks, and includes a connecting block, an air inlet box, and a fuel extreme gas chamber. A set of connecting blocks is fixedly installed on each side of the two sets of mounting blocks, and a fuel extreme gas chamber is opened on one side of the connecting block. An air inlet box is fixedly installed on one side of one set of connecting blocks and one side of the other set of connecting blocks, and the air inlet box and the fuel extreme gas chamber are connected.

[0007] Preferably, the electrolysis mechanism further includes a battery assembly, which is disposed between the two sets of current collectors. The air side of the device does not require air to be introduced, and there is no air cavity encapsulation. It is completely exposed inside the resistance furnace, which reduces energy loss caused by heating the air, improves electrolysis efficiency, and at the same time avoids the air carrying away a large amount of heat, ensuring uniform temperature of the battery assembly, reducing mass transfer resistance, and making seawater electrolysis hydrogen production more efficient and stable.

[0008] Preferably, the battery assembly includes a stainless steel connector, a single cell, and a light-collecting plate, which are stacked alternately in sequence and are fixedly connected by bolts.

[0009] Preferably, a fuel electrode outlet pipe is fixedly installed on the top of one set of connecting blocks, and a fuel electrode inlet pipe is fixedly installed on the top of the other set of connecting blocks.

[0010] Preferably, the outer walls of the fuel electrode inlet pipe and the fuel electrode outlet pipe are each provided with a set of heat insulation sleeves to prevent seawater vapor in the fuel electrode inlet pipe and the fuel electrode outlet pipe from condensing, so that the seawater is always kept in a steam state, which makes it more convenient to carry out electrolysis.

[0011] Preferably, the two sets of mounting blocks are fixedly connected by multiple sets of fastening bolts.

[0012] Preferably, a set of T-blocks is fixedly installed on the front side of one set of collector plates and the rear side of another set of collector plates, respectively. An anode collector column is threaded to the top of one set of T-blocks, and a cathode collector column is threaded to the top of the other set of collector plates.

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

[0014] This highly efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis to produce hydrogen utilizes a combination of connecting blocks, an air inlet box, a fuel electrode gas chamber, and battery modules. The air side of the device requires no air intake and is completely exposed inside the resistance furnace, reducing energy loss from heating air and improving electrolysis efficiency. Simultaneously, it prevents air from carrying away large amounts of heat, ensuring uniform battery module temperature, reducing mass transfer resistance, and making seawater electrolysis for hydrogen production more efficient and stable. Furthermore, the use of insulation jackets prevents condensation of seawater vapor in the fuel electrode inlet and outlet pipes, keeping the seawater in a constant vapor state, facilitating electrolysis. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the mounting block of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the connecting block of this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the battery assembly of this utility model.

[0020] Reference numerals: 1. Mounting block; 2. Electrolysis mechanism; 201. Connecting block; 202. Air inlet box; 203. Fuel electrode gas chamber; 204. Battery assembly; 2041. Stainless steel connector; 2042. Single cell; 2043. Current collector plate; 3. Fuel electrode inlet pipe; 4. Fuel electrode outlet pipe; 5. Current collector plate; 6. T-block; 7. Anode current collector column; 8. Cathode current collector column; 9. Fastening bolt; 10. Insulation sleeve. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] Please see Figure 1-4 This utility model provides a technical solution: a high-efficiency and stable flat-tube solid oxide fuel cell stack seawater electrolysis hydrogen production device, including mounting blocks 1 and electrolysis mechanism 2. The mounting blocks 1 include two sets, and two sets of current collectors 5 are arranged on adjacent sides of the two sets of mounting blocks 1. The electrolysis mechanism 2 is arranged on both sides of the mounting blocks 1. The electrolysis mechanism 2 includes a connecting block 201, an air inlet box 202 and a fuel extreme gas chamber 203. A connecting block 201 is fixedly installed on each side of the two sets of mounting blocks 1. One side of the connecting block 201 has an opening. A set of air inlet boxes 202 are fixedly installed on one side of a set of connecting blocks 201 and the other side of a set of connecting blocks 201 in the fuel extreme gas chamber 203. The air inlet boxes 202 and the fuel extreme gas chamber 203 are connected. The two sets of mounting blocks 1 are fixedly connected by multiple sets of fastening bolts 9. A set of T-shaped blocks 6 are fixedly installed on the front side of a set of collector plates 5 and the rear side of another set of collector plates 5. The top of the set of T-shaped blocks 6 is threadedly connected to an anode collector column 7, and the top of the other set of collector plates 5 is threadedly connected to a cathode collector column 8.

[0023] Secondly, the electrolysis mechanism 2 also includes a battery assembly 204. The battery assembly 204 is arranged between the two sets of current collectors 5. The battery assembly 204 includes a stainless steel connector 2041, a single cell 2042 and a current collector 2043. The stainless steel connector 2041, the single cell 2042 and the current collector 2043 are stacked alternately in sequence. The stainless steel connector 2041, the single cell 2042 and the current collector 2043 are fixedly connected by bolts. The air side of the device does not need to be vented with air, and there is no air cavity encapsulation. It is completely exposed inside the resistance furnace, which reduces the energy loss caused by heating the air and improves the electrolysis efficiency. At the same time, it avoids the air carrying away a large amount of heat, ensures the uniform temperature of the battery assembly 204, reduces the mass transfer resistance, and makes seawater electrolysis hydrogen production more efficient and stable.

[0024] Furthermore, a fuel electrode outlet pipe 4 is fixedly installed on the top of one set of connecting blocks 201, and a fuel electrode inlet pipe 3 is fixedly installed on the top of another set of connecting blocks 201. A set of heat insulation sleeves 10 are respectively provided on the outer walls of the fuel electrode inlet pipe 3 and the fuel electrode outlet pipe 4 to prevent seawater vapor in the fuel electrode inlet pipe 3 and the fuel electrode outlet pipe 4 from condensing, so that the seawater is always kept in a steam state, which makes it more convenient to carry out electrolysis.

[0025] Working principle: During assembly, the stainless steel connector 2041, single cell 2042, and light collector plate 2043 are stacked sequentially and secured with bolts. In use, the device is placed in a resistance furnace, heated to 750 degrees Celsius, and then kept warm. Seawater vapor is sent into the air inlet box 202 through the fuel electrode inlet pipe 3. The seawater vapor in the fuel electrode inlet pipe 3 is kept warm by the insulation sleeve 10. Then, the vapor enters the battery assembly 204 through the fuel electrode gas chamber 203, causing the seawater vapor to undergo a reduction reaction, producing hydrogen and oxygen negative ions. The electrolyzed hydrogen passes through the fuel electrode gas chamber 203 and is discharged from the fuel electrode outlet pipe 4 along with the unreacted water vapor. The discharged water vapor and hydrogen are separated and collected by a gas-liquid separator connected to the fuel electrode outlet pipe 4. The oxygen negative ions undergo an oxidation reaction through an electrolyte with cation conduction to generate oxygen. The oxygen is discharged between the stainless steel connector 2041 and the single cell 2042.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-efficiency and stable flat-tube solid oxide fuel cell stack for seawater electrolysis to produce hydrogen, characterized in that, include: Mounting block (1), the mounting block (1) includes two sets, and two sets of collector plates (5) are provided on the adjacent sides of the two sets of mounting blocks (1); An electrolysis mechanism (2) is disposed on both sides of the mounting block (1). The electrolysis mechanism (2) includes a connecting block (201), an air inlet box (202), and a fuel extreme gas chamber (203). A set of connecting blocks (201) is fixedly installed on both sides of the two sets of mounting blocks (1). A fuel extreme gas chamber (203) is opened on one side of the connecting block (201). A set of air inlet boxes (202) is fixedly installed on one side of one set of connecting blocks (201) and one side of the other set of connecting blocks (201). The air inlet box (202) and the fuel extreme gas chamber (203) are connected to each other.

2. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 1, characterized in that: The electrolysis mechanism (2) also includes a battery assembly (204), which is disposed between the two sets of current collectors (5).

3. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 2, characterized in that: The battery assembly (204) includes a stainless steel connector (2041), a single cell (2042), and a light-collecting plate (2043). The stainless steel connector (2041), the single cell (2042), and the light-collecting plate (2043) are stacked alternately in sequence, and the stainless steel connector (2041), the single cell (2042), and the light-collecting plate (2043) are fixedly connected by bolts.

4. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 3, characterized in that: A fuel electrode outlet pipe (4) is fixedly installed on the top of one set of connecting blocks (201), and a fuel electrode inlet pipe (3) is fixedly installed on the top of another set of connecting blocks (201).

5. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 4, characterized in that: The outer walls of the fuel electrode inlet pipe (3) and the fuel electrode outlet pipe (4) are respectively provided with a set of heat insulation sleeves (10).

6. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 5, characterized in that: The two sets of mounting blocks (1) are fixedly connected by multiple sets of fastening bolts (9).

7. The efficient and stable flat-tube solid oxide fuel cell stack for seawater electrolysis hydrogen production according to claim 6, characterized in that: A set of T-blocks (6) are fixedly installed on the front side of one set of current collectors (5) and the rear side of another set of current collectors (5). The top of one set of T-blocks (6) is threaded with an anode current collector column (7), and the top of the other set of current collectors (5) is threaded with a cathode current collector column (8).

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