Safety discharge protection system

Abstract

The utility model provides a safety relief protection system, which is applied to the technical field of hydrogen production safety and comprises an oxygen separator, a hydrogen separator and an electrolytic bath, the oxygen separator and the hydrogen separator are connected through a communicating pipe, the oxygen separator is provided with a first pressure transmitter, the hydrogen separator is provided with a second pressure transmitter, and the electrolytic bath is connected with the first pressure transmitter and the second pressure transmitter. Pneumatic ball valves are respectively arranged between the electrolytic cell and the oxygen separator, between the electrolytic cell and the hydrogen separator and on the communicating pipe, an oxygen emptying pipeline is arranged on the oxygen separator, a safety valve I is mounted on the oxygen emptying pipeline, a hydrogen emptying pipeline is arranged on the hydrogen separator, and a safety valve II is mounted on the hydrogen emptying pipeline. According to the safety relief protection system, the internal pressure of the separator is monitored through the pressure transmitter, the safety valve is controlled to automatically relieve pressure or stop working of the electrolytic tank and the alkali liquor pump according to needs, the internal pressure of the separator is controlled within a set range, and the safety of hydrogen production equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen production safety, and particularly relates to a safety relief protection system. Background Art

[0002] Hydrogen production by water electrolysis is a relatively convenient method for producing hydrogen. Direct current is passed through an electrolytic cell filled with electrolyte, and water molecules undergo electrochemical reactions on the electrodes, decomposing into hydrogen and oxygen.

[0003] An alkaline water electrolysis hydrogen production device is provided with a hydrogen separator and an oxygen separator. When the separators are in working state, the lower half is filled with alkali solution and the upper half is filled with gas. The oxygen generated at the anode of the electrolytic cell enters the oxygen separator along with the alkali solution, and the hydrogen generated at the cathode enters the hydrogen separator along with the alkali solution. The diaphragm characteristics of the electrolytic cell determine that the pressures on the hydrogen side and the oxygen side need to be kept consistent (i.e., the liquid levels are basically kept consistent). Therefore, the bottoms of the hydrogen separator and the oxygen separator are connected by a connecting pipe. However, if the pressure difference is too large and the liquid level on one side reaches zero, hydrogen / oxygen will enter the container on the other side through the connecting pipe, and the mixing of hydrogen and oxygen is prone to explosion hazards. Under normal circumstances, the connecting pipe structure of existing hydrogen production equipment can ensure the pressure consistency between the hydrogen separator and the oxygen separator. However, in extreme cases, such as when the outlet regulating valves on the hydrogen and oxygen sides malfunction or in case of a fire, the pressures in the hydrogen and oxygen separators will exceed the design pressure of the container, posing a safety hazard. Summary of the Utility Model

[0004] In view of the above problems in the prior art, the purpose of the present utility model is to provide a safety relief protection system, which monitors the internal pressure of the separator through a pressure transmitter, and automatically relieves pressure or stops the electrolytic cell and the alkali solution pump according to needs, controls the internal pressure of the separator within a set range, and improves the safety of hydrogen production equipment.

[0005] A safety relief protection system includes an oxygen separator, a hydrogen separator and an electrolytic cell. The oxygen separator and the hydrogen separator are connected by a connecting pipe. A pressure transmitter I is configured on the oxygen separator, and a pressure transmitter II is configured on the hydrogen separator. Pneumatic ball valves are respectively arranged between the electrolytic cell and the oxygen separator, between the electrolytic cell and the hydrogen separator, and on the connecting pipe. An oxygen vent pipe is arranged on the oxygen separator, and a safety valve I is installed on the oxygen vent pipe. A hydrogen vent pipe is arranged on the hydrogen separator, and a safety valve II is installed on the hydrogen vent pipe.

[0006] Preferably, the electrolytic cell is connected to an alkali solution cooler through an alkali solution pipe, the alkali solution cooler is connected to an alkali solution pump through an alkali solution pipe, and the alkali solution pump is also connected to the connecting pipe.

[0007] Preferably, the electrolytic cell is connected to the oxygen separator through an oxygen pipe and to the hydrogen separator through a hydrogen pipe. Pneumatic ball valves are respectively arranged on the oxygen pipe and the hydrogen pipe.

[0008] Preferably, the oxygen separator is also connected to an oxygen-water separator, and the hydrogen separator is also connected to a hydrogen-water separator.

[0009] The beneficial effects of the present utility model are as follows: For this safety relief protection system, the pressure inside the oxygen separator is monitored by a first pressure transmitter, and the pressure inside the hydrogen separator is monitored by a second pressure transmitter. The monitored values are compared with the set values. When the pressure inside the separator reaches the set value of the safety valve, the safety valve automatically relieves pressure and releases the gas through the vent pipe, thereby reducing the pressure inside the separator. By separately monitoring the pressures inside the oxygen separator and the hydrogen separator with the first pressure transmitter and the second pressure transmitter, the pressure difference between the two separators is maintained within the set range, which can avoid the mixing of hydrogen and oxygen caused by an excessive pressure difference and prevent the occurrence of explosion hazards.

[0010] In addition, according to the values monitored by the pressure transmitter, the reaction rate of the electrolytic cell and the working frequency of the lye pump are controlled in a timely manner. By reducing the reaction rate, the pressure inside the separator is reduced, which is beneficial to improving the safety of the entire hydrogen production equipment. Description of the Drawings

[0011] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0012] Figure 1 is a schematic structural diagram of the present utility model.

[0013] The labels in the figure are: 1, oxygen separator; 2, hydrogen separator; 3, electrolytic cell; 4, lye pump; 5, lye cooler; 6, oxygen-water separator; 7, hydrogen-water separator; 8, first pressure transmitter; 9, second pressure transmitter; 10, first safety valve; 11, second safety valve. Detailed Embodiments

[0014] Embodiment 1

[0015] As Figure 1 shown, a safety relief protection system includes an oxygen separator 1, a hydrogen separator 2, and an electrolytic cell 3. The oxygen separator 1 and the hydrogen separator 2 are connected by a connecting pipe. The electrolytic cell 3 is connected to the lye cooler 5 through a lye pipe. The lye cooler 5 is connected to the lye pump 4 through a lye pipe. The lye pump 4 is connected to the connecting pipe. The oxygen separator 1 is connected to an oxygen-water separator 6, and the hydrogen separator 2 is connected to a hydrogen-water separator 7. The lye cooler 5 and the lye pump 4 are used to deliver lye to the electrolytic cell 3. The oxygen generated by the electrolytic cell 3 is dried by passing through the oxygen separator 1 and the oxygen-water separator 6, and the hydrogen produced is dried by passing through the hydrogen separator 2 and the hydrogen-water separator 7, thereby realizing the basic hydrogen production operation.

[0016] As Figure 1 shown, a first pressure transmitter 8 is configured on the oxygen separator 1, and a second pressure transmitter 9 is configured on the hydrogen separator 2 to monitor the pressures inside the oxygen separator 1 and the hydrogen separator 2. An oxygen vent pipe is provided on the oxygen separator 1, and a first safety valve 10 is installed on the oxygen vent pipe. A hydrogen vent pipe is provided on the hydrogen separator 2, and a second safety valve 11 is installed on the hydrogen vent pipe. When the pressures inside the oxygen separator 1 and the hydrogen separator 2 reach the corresponding safety valve set values, the corresponding safety valves automatically relieve pressure and release the gas through the vent pipes, thereby reducing the pressure inside the separators and improving the safety of the hydrogen production process.

[0017] In addition, pneumatic ball valves are respectively provided between the electrolyzer 3 and the oxygen separator 1, between the electrolyzer 3 and the hydrogen separator 2, and on the connecting pipe. Specifically, the electrolyzer 3 is connected to the oxygen separator 1 through an oxygen pipe and to the hydrogen separator 2 through a hydrogen pipe, and pneumatic ball valves are respectively provided on the oxygen pipe and the hydrogen pipe. When the pressures inside the oxygen separator 1 and the hydrogen separator 2 reach the corresponding pressure transmitter set values, the electrolyzer 3 and the lye pump 4 are controlled to pause operation, and the pressure inside the separators is reduced by reducing the reaction rate, which is beneficial to improving the safety of the entire hydrogen production equipment.

[0018] It should be noted that the set values of the first safety valve 10 and the second safety valve 11 should be taken as the design pressures of the oxygen separator 1 and the hydrogen separator 2, and the set values of the first pressure transmitter 8 and the second pressure transmitter 9 when controlling the pneumatic ball valves to close should be lower than the safety valve setting pressure value and higher than the normal alarm value of the hydrogen production device.

[0019] Working principle: For this safety relief protection system, during use, normal hydrogen production operations are achieved through the lye cooler 5, the lye pump 4, the electrolyzer 3, the oxygen separator 1, the hydrogen separator 2, the oxygen water separator 6, and the hydrogen water separator 7. During the hydrogen production process, the pressure inside the oxygen separator 1 is monitored by the first pressure transmitter 8, and the pressure inside the hydrogen separator 2 is monitored by the second pressure transmitter 9. When the pressures inside the oxygen separator 1 and the hydrogen separator 2 reach the corresponding safety valve set values, the corresponding safety valves automatically relieve pressure; when the pressures inside the oxygen separator 1 and the hydrogen separator 2 reach the corresponding pressure transmitter set values, the electrolyzer 3 and the lye pump 4 are controlled to pause operation, thereby pausing the hydrogen production operation, reducing the reaction rate, and ensuring the safety of the hydrogen production equipment.

[0020] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A safety relief protection system, comprising an oxygen separator (1), a hydrogen separator (2) and an electrolytic cell (3), characterized in that, The oxygen separator (1) and the hydrogen separator (2) are connected by a connecting pipe. A pressure transmitter I (8) is arranged on the oxygen separator (1), and a pressure transmitter II (9) is arranged on the hydrogen separator (2). Pneumatic ball valves are respectively arranged between the electrolytic cell (3) and the oxygen separator (1), between the electrolytic cell (3) and the hydrogen separator (2), and on the connecting pipe. An oxygen vent pipe is arranged on the oxygen separator (1), and a safety valve I (10) is installed on the oxygen vent pipe. A hydrogen vent pipe is arranged on the hydrogen separator (2), and a safety valve II (11) is installed on the hydrogen vent pipe.

2. The safety relief protection system according to claim 1, wherein The electrolytic cell (3) is connected to the lye cooler (5) through a lye pipe. The lye cooler (5) is connected to the lye pump (4) through a lye pipe. The lye pump (4) is also connected to the connecting pipe.

3. The safety relief protection system according to claim 1, characterized in that, The electrolytic cell (3) is connected to the oxygen separator (1) through an oxygen pipe and to the hydrogen separator (2) through a hydrogen pipe. Pneumatic ball valves are respectively arranged on the oxygen pipe and the hydrogen pipe.

4. The safety relief protection system according to claim 1, characterized in that, The oxygen separator (1) is also connected to the oxygen-water separator (6), and the hydrogen separator (2) is also connected to the hydrogen-water separator (7).

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