A pressure equalization and pressure differential compatible PEM electrolytic water system

Abstract

The utility model discloses a kind of compatible PEM electrolytic water systems of pressure equalization and pressure difference, comprising: PEM electrolytic cell, the cathode output end and anode output end of PEM electrolytic cell are connected with hydrogen separation tank and oxygen separation tank respectively, hydrogen separation tank and oxygen separation tank are connected with pure water supply mechanism by hydrogen separation tank water inlet pipe and oxygen separation tank water inlet pipe respectively, the top of hydrogen separation tank is provided with hydrogen output mechanism, the top of oxygen separation tank is provided with oxygen output mechanism, the bottom of oxygen separation tank is provided with oxygen separation tank water output pipe, oxygen separation tank water output pipe is connected to the water inlet end of PEM electrolytic cell, the bottom of hydrogen separation tank and oxygen separation tank is provided with the communication pipe of first control ball valve, communication pipe is provided with the drain pipe of first drain valve in parallel on it.The utility model has the advantages that: its structure is simple, also very convenient to use, can select pressure equalization mode or pressure difference mode according to actual needs in production process, equipment compatibility is good.

Description

Technical Field

[0001] This utility model relates to the technical field of water electrolysis production equipment, specifically to a PEM water electrolysis system. Background Technology

[0002] Hydrogen is a clean energy source, and PEM (Polymer Extraction Method) water electrolysis technology offers advantages such as high hydrogen purity, fast dynamic response, and high output hydrogen pressure. Currently, PEM water electrolysis is the most promising hydrogen production technology.

[0003] Traditional PEM water electrolysis systems are divided into two types: equal-pressure and differential-pressure. The equal-pressure type means that the pressures at the anode and cathode of the electrolyzer are the same; the differential-pressure type means that the anode is at atmospheric pressure and the cathode is at high pressure. Currently, these two pressure modes of PEM water electrolysis systems are incompatible, making it impossible to select the more suitable mode for hydrogen production based on actual needs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a PEM water electrolysis system that is compatible with both equal pressure and differential pressure, which can provide two working modes for production selection, and has good equipment compatibility.

[0005] To solve the above problems, the technical solution adopted by this utility model is: a PEM electrolysis water system compatible with pressure equalization and pressure difference, comprising: a PEM electrolysis cell, the cathode output end and anode output end of the PEM electrolysis cell being connected to a hydrogen separation tank and an oxygen separation tank respectively, both of which are pressure vessels. The hydrogen separation tank and the oxygen separation tank are connected to a pure water supply mechanism through hydrogen separation tank inlet pipes and oxygen separation tank inlet pipes respectively. A hydrogen output mechanism is provided at the top of the hydrogen separation tank, and an oxygen output mechanism is provided at the top of the oxygen separation tank. An oxygen separation tank water output pipe is provided at the bottom of the oxygen separation tank, which is connected to the water inlet end of the PEM electrolysis cell. A connecting pipe with a first control ball valve is provided at the bottom of the hydrogen separation tank and the oxygen separation tank, and a drain pipe with a first drain valve is connected in parallel on the connecting pipe.

[0006] Furthermore, in the aforementioned PEM electrolysis water system compatible with both equal pressure and differential pressure, a first filter, a circulating water pump, and a plate heat exchanger are sequentially installed on the oxygen separation tank water output pipe between the oxygen separation tank and the PEM electrolysis cell. A return pipe is installed on the oxygen separation tank water output pipe between the circulating water pump and the plate heat exchanger, and the return pipe is connected to the oxygen separation tank. A deionizer and a second filter are installed on the return pipe. The cooling medium for the plate heat exchanger is cooling water, which enters the plate heat exchanger from the cooling water inlet pipe and exits the plate heat exchanger from the cooling water output pipe. An electric ball valve for adjusting the flow rate is installed on the cooling water inlet pipe.

[0007] Furthermore, in the aforementioned PEM electrolysis water system compatible with both equal pressure and differential pressure, the pure water supply mechanism includes an inlet pipe connected to a pure water processor, which is connected to a pure water storage tank. The pure water storage tank is equipped with a pure water output pipe with a plunger pump, which is connected to the inlet pipes of the hydrogen separator and the oxygen separator respectively. The hydrogen separator inlet pipe is equipped with a hydrogen separator water replenishment solenoid valve and a hydrogen separator water replenishment check valve, and the oxygen separator inlet pipe is equipped with an oxygen separator water replenishment solenoid valve and an oxygen separator water replenishment check valve.

[0008] Furthermore, in the aforementioned PEM electrolysis water system compatible with both equalization and differential pressure, the hydrogen output mechanism includes: a hydrogen condenser, with a hydrogen output pipe at the output end of the hydrogen condenser, and a hydrogen output diaphragm regulating valve, a hydrogen output check valve, and a hydrogen output control needle valve installed on the hydrogen output pipe; the output end of the hydrogen condenser is also equipped with a hydrogen discharge pipe, and a hydrogen discharge pipe proportional unloading valve is installed on the hydrogen discharge pipe.

[0009] Furthermore, in the aforementioned PEM electrolysis water system compatible with both equal pressure and differential pressure, the oxygen output mechanism includes: an oxygen condenser, an oxygen output pipe at the output end of the oxygen condenser, and an oxygen output diaphragm regulating valve, an oxygen output check valve, and an oxygen output control needle valve installed on the oxygen output pipe; the output end of the oxygen condenser is also equipped with a proportional unloading valve for the oxygen discharge pipe.

[0010] Furthermore, in the aforementioned PEM electrolysis water system that is compatible with both equal pressure and differential pressure, the cathode output end of the PEM electrolyzer is connected to the hydrogen separation tank via an electrolyzer hydrogen output pipe with a one-way valve, and the anode output end of the PEM electrolyzer is connected to the oxygen separation tank via an electrolyzer oxygen output pipe, with a temperature sensor installed on the electrolyzer oxygen output pipe.

[0011] Furthermore, in the aforementioned PEM electrolysis water system that is compatible with both equal pressure and differential pressure, a conductivity sensor is installed on the oxygen separation tank water output pipe between the plate heat exchanger and the PEM electrolysis cell.

[0012] The advantages of this utility model are: This application provides a PEM electrolysis water system that is compatible with both equal pressure and differential pressure. It has a simple structure and is easy to use. During the production process, the equal pressure mode or differential pressure mode can be selected according to actual needs, and the equipment has good compatibility. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the principle structure of a PEM electrolysis water system that is compatible with both equal pressure and differential pressure, as described in this utility model. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0015] like Figure 1 As shown, a PEM electrolysis water system compatible with pressure equalization and differential pressure includes: a PEM electrolyzer 1, the cathode output end and anode output end of the PEM electrolyzer 1 are respectively connected to a hydrogen separation tank 2 and an oxygen separation tank 3. In this embodiment, the cathode output end of the PEM electrolyzer 1 is connected to the hydrogen separation tank 2 through an electrolyzer hydrogen output pipe 11 with a one-way valve 111, and the anode output end of the PEM electrolyzer 1 is connected to the oxygen separation tank 3 through an electrolyzer oxygen output pipe 12. A temperature sensor 121 is installed on the electrolyzer oxygen output pipe 12.

[0016] Hydrogen separator 2 and oxygen separator 3 are connected to pure water supply mechanism 4 via hydrogen separator inlet pipe 21 and oxygen separator inlet pipe 31, respectively. In this embodiment, pure water supply mechanism 4 includes inlet pipe 41, which is connected to pure water processor 42. Pure water processor 42 is connected to pure water storage tank 43. Pure water storage tank 43 is equipped with pure water output pipe 431 with plunger pump 431, which is connected to hydrogen separator inlet pipe 21 and oxygen separator inlet pipe 31, respectively. Hydrogen separator inlet pipe 21 is equipped with hydrogen separator water replenishment solenoid valve 211 and hydrogen separator water replenishment check valve 212. Oxygen separator inlet pipe 31 is equipped with oxygen separator water replenishment solenoid valve 311 and oxygen separator water replenishment check valve 312.

[0017] The top of the hydrogen separator 2 is equipped with a hydrogen output mechanism, which includes a hydrogen condenser 5. The output end of the hydrogen condenser 5 is connected to a hydrogen output pipe 51, which is equipped with a hydrogen output diaphragm regulating valve 511, a hydrogen output check valve 512, and a hydrogen output control needle valve 513. The output end of the hydrogen condenser 5 is also equipped with a hydrogen discharge pipe 52, which is equipped with a hydrogen discharge pipe proportional unloading valve 521. The hydrogen separator 2 is equipped with a hydrogen separator pressure sensor 201 and a hydrogen separator level gauge 202.

[0018] An oxygen output mechanism is installed at the top of the oxygen separator 3. The oxygen output mechanism includes an oxygen condenser 6, with an oxygen output pipe 61 at its output end. The oxygen output pipe 61 is equipped with an oxygen output diaphragm regulating valve 611, an oxygen output check valve 612, and an oxygen output control needle valve 613. An oxygen discharge pipe 62 is also installed at the output end of the oxygen condenser 6, with an oxygen discharge pipe proportional unloading valve 621 installed on it. An oxygen separator pressure sensor 301 and an oxygen separator level gauge 302 are installed on the oxygen separator 3.

[0019] The oxygen separator 3 has an oxygen separator water output pipe 32 at its bottom, which is connected to the water inlet of the PEM electrolyzer 1. The hydrogen separator 2 and the oxygen separator 3 have a connecting pipe 7 with a first control ball valve 71 at their bottoms, and a drain pipe 8 with a first drain valve 81 is connected in parallel to the connecting pipe 7. In this embodiment, the connecting pipe 7 is connected to the oxygen separator water output pipe 32 at the bottom of the oxygen separator 3.

[0020] In this embodiment, a first filter 321, a circulating water pump 322, and a plate heat exchanger 323 are sequentially installed on the oxygen separator water output pipe 32 between the oxygen separator 3 and the PEM electrolysis cell 1. A return pipe 33 is installed on the oxygen separator water output pipe 32 between the circulating water pump 322 and the plate heat exchanger 323, and the return pipe 33 is connected to the oxygen separator 3. A deionizer 331 and a second filter 332 are installed on the return pipe 33. A conductivity sensor 324 is installed on the oxygen separator water output pipe 32 between the plate heat exchanger 323 and the PEM electrolysis cell 1. In this embodiment, cooling water is used as the cooling medium for the plate heat exchanger 323. The cooling water enters the plate heat exchanger 323 from the cooling water inlet pipe 3231 and exits the plate heat exchanger 323 from the cooling water output pipe 3232. An electric ball valve 3233 for adjusting the flow rate is installed on the cooling water inlet pipe 3231.

[0021] The specific working principle is as follows.

[0022] I. Pressure Equalization Operation: Open the first control ball valve 71 to ensure that the bottoms of the oxygen separator 3 and the hydrogen separator 2 remain connected, and the liquid levels in the oxygen separator 3 and the hydrogen separator 2 are kept consistent. Tap water is purified by the pure water processor 42 and stored in the pure water storage tank 43. The liquid level of the oxygen separator 3 is controlled by the oxygen separator level gauge 302. When the liquid level is lower than the low liquid level set value, the oxygen separator water replenishment solenoid valve 311 on the oxygen separator water inlet pipe 31 is opened and the plunger pump 4311 is turned on to replenish water into the oxygen separator 3. When the oxygen separator level gauge 302 reports that the liquid level has reached the high liquid level set value, the oxygen separator water replenishment solenoid valve 311 and the plunger pump 4311 are closed. Similarly, the hydrogen separator 2 controls the liquid level through the hydrogen separator level gauge 202. When the liquid level is lower than the low liquid level set value, the hydrogen separator water replenishment solenoid valve 211 is opened and the plunger pump 4311 is turned on to replenish water into the hydrogen separator 2. When the hydrogen separator level gauge 202 reports that the liquid level has reached the high liquid level set value, the hydrogen separator water replenishment solenoid valve 211 and the plunger pump 4311 are turned off.

[0023] The pure water in oxygen separator 3 and hydrogen separator 2 is filtered by the first filter 321 to remove fine particulate matter, preventing damage to the circulating water pump 322 and PEM electrolyzer 1. Powered by the circulating water pump 322, the water temperature is adjusted to a suitable level via the plate heat exchanger 323. Temperature adjustment method: The opening of the electric ball valve 3233 is adjusted based on the water temperature at the anode outlet of PEM electrolyzer 1, fed back by the temperature sensor 121. Cooling water is supplied by a chiller, with a set temperature of 20°C. A small portion is diverted through the deionizer 331 and the second filter 332, returning to the oxygen separator 3 via the return pipe 33. Most of the circulating water enters the PEM electrolyzer 1 after passing through the conductivity sensor 324, returning to the oxygen separator 3 along with the generated oxygen. After gas-liquid separation, the oxygen is cooled by the oxygen condenser 6. After being pressurized to the set pressure by the oxygen output diaphragm regulating valve 611, it is then output through the oxygen output check valve 612 and the oxygen output control needle valve 613. The back pressure is adjusted by regulating the opening of the oxygen output diaphragm regulating valve 611 based on the pressure feedback from the oxygen separator pressure sensor 301, thereby controlling the pressure in the oxygen separator 3. When the pressure in the oxygen separator 3 exceeds the safety value, the oxygen discharge pipe proportional unloading valve 621 automatically releases pressure to protect the equipment.

[0024] Hydrogen produced by PEM electrolyzer 1 enters hydrogen separator 2 through one-way valve 111 and hydrogen output pipe 11. After gas-liquid separation, it is cooled by hydrogen condenser 5. After passing through hydrogen output diaphragm regulating valve 511 to achieve the set pressure, it passes through hydrogen output one-way valve 512 and hydrogen output control needle valve 513 before being output as hydrogen. The back pressure is adjusted by regulating the opening of hydrogen output diaphragm regulating valve 511 based on the pressure feedback from hydrogen separator pressure sensor 201, thereby controlling the pressure in hydrogen separator 2. When the pressure in hydrogen separator 2 exceeds the safety value, hydrogen discharge pipe proportional unloading valve 521 automatically releases pressure to protect the equipment.

[0025] II. Differential Pressure Operation: Close the first control ball valve 71. Tap water is purified by the pure water processor 42 and stored in the pure water storage tank 43. The oxygen separator 3 controls the liquid level through the oxygen separator level gauge 302. When the liquid level is lower than the low liquid level set value, the oxygen separator water replenishment solenoid valve 311 on the oxygen separator water inlet pipe 31 is opened and the plunger pump 4311 is turned on to replenish water into the oxygen separator 3. When the oxygen separator level gauge 302 reports that the liquid level has reached the high liquid level set value, the oxygen separator water replenishment solenoid valve 311 and the plunger pump 4311 are closed. No water needs to be added to the hydrogen separator 2. When the level gauge 202 of the hydrogen separator 2 indicates that the liquid level has reached the high liquid level setting value, the first drain valve 81 is opened. Since the system is in differential pressure operation, the pressure in the hydrogen separator 2 is higher than the pressure in the oxygen separator 3. The water in the hydrogen separator 2 flows to the oxygen separator 3 through the drain pipe 8. When the level gauge 202 of the hydrogen separator 2 indicates that the liquid level has reached the low liquid level setting value, the drainage is completed, and the first drain valve 81 is closed.

[0026] Powered by a circulating water pump 322, the circulating water temperature is adjusted to a suitable level via a plate heat exchanger 323. Temperature regulation is achieved by adjusting the opening of the electric ball valve 3233 based on the water temperature at the anode outlet of the PEM electrolyzer 1, as fed back by the temperature sensor 121. Cooling water is supplied by a chiller with a set temperature of 20°C. A small portion of the circulating water is diverted through a deionizer 331 and a second filter 332, returning to the oxygen separator 3 via the return pipe 33. Most of the circulating water enters the PEM electrolyzer 1 after passing through the conductivity sensor 324, returning to the oxygen separator 3 along with the generated oxygen. The oxygen after gas-water separation is cooled by the oxygen condenser 6, then pressurized to a set pressure by the oxygen output diaphragm regulating valve 611, and finally output through the oxygen output check valve 612 and the oxygen output control needle valve 613. Back pressure regulation is achieved by adjusting the opening of the oxygen output diaphragm regulating valve 611 based on the pressure inside the oxygen separator 3, thereby controlling the pressure in the oxygen separator 3. When the pressure in oxygen separator 3 exceeds the safety value, the proportional unloading valve 621 of the oxygen discharge pipe automatically releases pressure to protect the equipment.

[0027] The pure water in oxygen separator 3 is filtered by the first filter 321 to remove fine particles. Powered by the circulating water pump 322, the water temperature is adjusted to a suitable level by the plate heat exchanger 323. The temperature adjustment method involves adjusting the opening of the electric ball valve 3233 based on the water temperature at the anode outlet of the PEM electrolyzer 1, as fed back by the temperature sensor 121. Cooling water is supplied by a chiller, with a set temperature of 20°C. A small portion is diverted through the deionizer 331 and the second filter 332, returning to the oxygen separator 3 via the return pipe 33. Most of the circulating water enters the PEM electrolyzer 1 after passing through the conductivity sensor 324, returning to the oxygen separator 3 along with the generated oxygen. The oxygen after gas-water separation is cooled by the oxygen condenser 6. Due to differential pressure operation, the oxygen output diaphragm regulating valve 611 remains fully open. The oxygen is then output after passing through the oxygen output check valve 612 and the oxygen output control needle valve 613.

[0028] Hydrogen produced by PEM electrolyzer 1 enters hydrogen separator 2 through one-way valve 111 and hydrogen output pipe 11. After gas-liquid separation, it is cooled by hydrogen condenser 5. After the back pressure of hydrogen output diaphragm regulating valve 511 is reached to the set pressure, hydrogen is then output through hydrogen output one-way valve 512 and hydrogen output control needle valve 513. Back pressure adjustment method: The opening of hydrogen output diaphragm regulating valve 511 is adjusted according to the pressure in hydrogen separator 2 fed back by hydrogen separator pressure sensor 201, thereby controlling the pressure in hydrogen separator 2. When the pressure in hydrogen separator 2 exceeds the safety value, hydrogen discharge pipe proportional unloading valve 521 automatically releases pressure to protect the equipment.

[0029] As can be seen from the above, this application provides a PEM electrolysis water system that is compatible with both equalization and differential pressure. It has a simple structure and is easy to use. During the production process, the equalization mode or differential pressure mode can be selected according to actual needs, and the equipment has good compatibility.

Claims

1. A PEM water electrolysis system compatible with both pressure equalization and pressure difference, comprising: The PEM electrolyzer is characterized in that: the cathode output end and the anode output end of the PEM electrolyzer are respectively connected to a hydrogen separation tank and an oxygen separation tank; the hydrogen separation tank and the oxygen separation tank are respectively connected to a pure water supply mechanism through a hydrogen separation tank inlet pipe and an oxygen separation tank inlet pipe; a hydrogen output mechanism is provided at the top of the hydrogen separation tank; an oxygen output mechanism is provided at the top of the oxygen separation tank; an oxygen separation tank water output pipe is provided at the bottom of the oxygen separation tank; the oxygen separation tank water output pipe is connected to the water inlet end of the PEM electrolyzer; a connecting pipe with a first control ball valve is provided at the bottom of the hydrogen separation tank and the oxygen separation tank; and a drain pipe with a first drain valve is connected in parallel on the connecting pipe.

2. The PEM electrolysis water system with pressure equalization and pressure difference compatibility according to claim 1, characterized in that: A first filter, a circulating water pump, and a plate heat exchanger are sequentially installed on the oxygen separator water output pipe between the oxygen separator and the PEM electrolyzer. A return pipe is installed on the oxygen separator water output pipe between the circulating water pump and the plate heat exchanger, and the return pipe is connected to the oxygen separator. A deionizer and a second filter are installed on the return pipe. The cooling medium of the plate heat exchanger is cooling water. The cooling water enters the plate heat exchanger from the cooling water inlet pipe and exits the plate heat exchanger from the cooling water output pipe. An electric ball valve for adjusting the flow rate is installed on the cooling water inlet pipe.

3. The PEM electrolysis water system with pressure equalization and pressure difference compatibility according to claim 1, characterized in that: The pure water supply system includes an inlet pipe that connects to a pure water processor, which in turn connects to a pure water storage tank. The pure water storage tank is equipped with a pure water output pipe with a plunger pump. The pure water output pipe is connected to the inlet pipes of the hydrogen separator and the oxygen separator, respectively. The inlet pipe of the hydrogen separator is equipped with a hydrogen separator water replenishment solenoid valve and a hydrogen separator water replenishment check valve. The inlet pipe of the oxygen separator is equipped with an oxygen separator water replenishment solenoid valve and an oxygen separator water replenishment check valve.

4. The PEM electrolysis water system with pressure equalization and pressure difference compatibility according to claim 1, characterized in that: The hydrogen output mechanism includes: a hydrogen condenser, with a hydrogen output pipe at the output end of the hydrogen condenser, and a hydrogen output diaphragm regulating valve, a hydrogen output check valve, and a hydrogen output control needle valve installed on the hydrogen output pipe; the output end of the hydrogen condenser is also equipped with a hydrogen discharge pipe, and a hydrogen discharge pipe proportional unloading valve is installed on the hydrogen discharge pipe.

5. A PEM electrolysis water system compatible with pressure equalization and pressure difference according to claim 1, characterized in that: The oxygen output mechanism includes: an oxygen condenser, an oxygen output pipe at the output end of the oxygen condenser, an oxygen output diaphragm regulating valve, an oxygen output check valve, and an oxygen output control needle valve on the oxygen output pipe; and an oxygen discharge pipe proportional unloading valve at the output end of the oxygen condenser.

6. The PEM electrolysis water system compatible with pressure equalization and pressure difference according to claim 1, characterized in that: The cathode output of the PEM electrolyzer is connected to the hydrogen separation tank via a hydrogen output pipe with a one-way valve, and the anode output of the PEM electrolyzer is connected to the oxygen separation tank via an oxygen output pipe. A temperature sensor is installed on the oxygen output pipe.

7. The PEM electrolysis water system with pressure equalization and pressure difference compatibility according to claim 1, characterized in that: A conductivity sensor is installed on the water output pipe of the oxygen separator between the plate heat exchanger and the PEM electrolysis cell.

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