PEM water electrolysis hydrogen production double-water-tank system

Abstract

The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a PEM water electrolysis hydrogen production double-water-tank system which is technically characterized by comprising two water tanks, a water inlet system, a filtering system, an electrolysis system and a drainage system. The water inlet system is communicated with one of the water tanks and used for supplying pure water to the two water tanks, the filtering system is used for filtering entering water flow to ensure that the water quality meets the working requirement, the electrolysis system is used for carrying out water electrolysis work on entering pure water, and the drainage system is used for discharging waste water. A single water tank is changed into a double-water-tank system, the volume of the water tanks is guaranteed, the water storage capacity is large, water in the system is sufficient, and the flow of water entering the electrolytic bath is sufficient; and in the water returning process of the electrolytic bath, water is returned in the first water tank, and the liquid level in the second water tank cannot be influenced because the pipeline for connecting the two water tanks is arranged at the bottom, so that the liquid level in the second water tank is relatively stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic water hydrogen production technical field, concretely relates to a PEM electrolytic water hydrogen production double water tank system. BACKGROUND

[0002] PEM electrolytic water hydrogen production, namely proton exchange membrane electrolytic water hydrogen production, is one of the most environment-friendly technical routes for producing hydrogen at present, is the only renewable energy electrolytic water hydrogen production mode that can meet the EU technical index, has many advantages and wide application field, is one of the important directions for the future hydrogen energy industry development.

[0003] Based on the single water tank system in the PEM electrolytic water hydrogen production system at present, there are certain problems:

[0004] ①According to different working environments, the size of water tank is different, and all need to be customized to meet different situations, and the cost is higher.

[0005] ②The size of the water tank in the system is fixed, and the water storage capacity is not enough because the volume of the water tank is small, so that the water flow into the electrolytic tank is not enough.

[0006] ③When the electrolytic tank returns water to the water tank, because the working pressure of the electrolytic tank is generally 3MPa, the return water has certain pressure, which can cause the liquid level in the water tank to fluctuate greatly, the liquid level measured by the liquid level sensor is not accurate, the displayed liquid level is not accurate, the set water replenishment liquid level is affected, and the water replenishment is not timely.

[0007] ④In the process of electrolytic tank water return, part of the oxygen and hydrogen decomposed by electrolytic water will flow back to the water tank with water, when the oxygen fan starts, the oxygen and hydrogen will be sucked into the atmosphere, which will cause the pressure change in the water tank, and the liquid level in the water tank will fluctuate, and the measured liquid level is not accurate. UTILITY MODEL CONTENTS

[0008] Therefore, the purpose of the present application is to solve the problems in the single water tank system in the PEM electrolytic water hydrogen production system in the prior art.

[0009] The above technical purpose of the utility model is realized by the following technical scheme:

[0010] The application discloses a PEM electrolytic water hydrogen production double water tank system which comprises a water tank, a water inlet system, a filtering system, an electrolysis system and a water outlet system.

[0011] Preferably, the two water tanks are a first water tank and a second water tank respectively, and temperature sensors and liquid level sensors are arranged on the two water tanks respectively to detect the temperature and liquid level height of water flow in the water tanks; an oxygen extraction fan is arranged on the first water tank to extract oxygen and hydrogen in the first water tank to the atmosphere.

[0012] Preferably, the water inlet system comprises a pure water device which is connected with the first water tank through a pipeline, and a first water replenishing electromagnetic valve is arranged between the pure water device and the first water tank, and the first water replenishing electromagnetic valve is controlled by a liquid level sensor in the second water tank.

[0013] Preferably, the filtering system is arranged on the second water tank, and the filtering system comprises a Y-shaped filter, a centrifugal pump, a resin tank, a filter and a filtering pipeline, wherein one end of the filtering pipeline is located at the bottom of the second water tank, and the other end is fixed to the top of the second water tank along one side of the water tank, and the Y-shaped filter, the centrifugal pump, the resin tank and the filter are sequentially arranged on the filtering pipeline from the bottom of the second water tank along the guiding direction of the filtering pipeline.

[0014] Preferably, the electrolysis system comprises an electrolysis pipeline and an electrolysis tank, one end of the electrolysis pipeline is connected with the centrifugal pump, and the other end is located at the top of the first water tank, the electrolysis tank is arranged on the electrolysis pipeline to perform electrolysis reaction on water flow passing through the electrolysis pipeline, and one side of the electrolysis tank is connected with a hydrogen collection system.

[0015] Preferably, the electrolysis system further comprises a heat exchange device which is located between the electrolysis tank and the centrifugal pump to perform heat exchange on water flow in the electrolysis pipeline so as to control the temperature of the water to be between 50 DEG C and 60 DEG C.

[0016] Preferably, the heat exchange device is a fin heat exchanger, the electrolysis pipeline passes through the fin heat exchanger, the fin heat exchanger is located between the centrifugal pump and the electrolysis tank, the fin heat exchanger is provided with a heat exchange water inlet and a heat exchange water outlet, the heat exchange water inlet and the heat exchange water outlet are connected by a heat exchange water pipeline, the heat exchange water pipeline passes through the fin heat exchanger to exchange heat for the liquid in the electrolysis pipeline, and the heat exchange water inlet is provided with a second water supplement electromagnetic valve on one side for supplying heat exchange water to the part of the heat exchange water pipeline located in the fin heat exchanger.

[0017] Preferably, the electrolysis pipeline is further provided with a pressure sensor for detecting the water flow pressure in the electrolysis pipeline, and the pressure sensor is located between the fin heat exchanger and the electrolysis tank.

[0018] Preferably, the drainage system comprises two groups of drainage pipelines and a wastewater device, one of the drainage pipelines is connected between the first water tank and the wastewater device, and the other drainage pipeline is connected between the centrifugal pump and the wastewater device, and the overflow water in the first water tank and the second water tank is drained through the drainage pipelines.

[0019] Preferably, the drainage pipeline connected between the first water tank and the wastewater device is provided with a manual drainage valve, and the drainage pipeline connected between the centrifugal pump and the wastewater device is provided with a drainage electromagnetic valve.

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] Through the double water tank system, different sizes of water tanks required by different working environments can be reduced, the mold opening cost is reduced, the manufacturing cost is reduced, the production efficiency is improved, and the situation that the liquid level in the water tank fluctuates greatly due to the large backwater pressure is stabilized, and the liquid level sensor reading is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an embodiment of the PEM electrolytic water hydrogen production double water tank system.

[0023] In the figure, 1, the first water tank; 11, temperature sensor; 12, liquid level sensor; 13, oxygen extraction fan; 2, the second water tank; 21, connecting pipe; 3, water inlet system; 31, pure water device; 32, first water replenishment electromagnetic valve; 4, filtration system; 41, Y-shaped filter; 42, centrifugal pump; 43, resin tank; 44, filter; 45, filter pipeline; 5, electrolysis system; 51, electrolysis pipeline; 511, pressure sensor; 52, electrolytic cell; 53, heat exchange device; 531, fin heat exchanger; 532, heat exchange water inlet; 533, heat exchange water outlet; 534, second water replenishment electromagnetic valve; 6, drainage system; 61, drainage pipeline; 611, manual drainage valve; 612, drainage electromagnetic valve; 62, wastewater device. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail below in combination with the drawings and examples.

[0025] Please refer to Figure 1 A PEM electrolytic water hydrogen production double water tank system, including two water tanks, water inlet system 3, filtration system 4, electrolysis system 5 and drainage system 6, wherein two water tanks are placed in parallel, and the bottoms of the two water tanks are coplanar, and a communication pipe is arranged at the bottom of the two water tanks for connecting the two water tanks. The water inlet system 3 is connected to one of the water tanks for supplying pure water to the two water tanks, the filtration system 4 is used for filtering the incoming water flow to ensure that the water quality meets the working requirements, the electrolysis system 5 is used for water electrolysis of the incoming pure water, and the drainage system 6 is used for discharging wastewater from the system.

[0026] Please refer to Figure 1 The two water tanks are a first water tank 1 and a second water tank 2, respectively, and temperature sensors 11 and liquid level sensors 12 are arranged on the two water tanks, respectively, for detecting the temperature and liquid level of the water flow in the water tank. In an embodiment, the first water tank 1 is provided with an oxygen extraction fan 13 for extracting oxygen and hydrogen in the first water tank 1 to the atmosphere.

[0027] Please refer to Figure 1 The water inlet system 3 includes a pure water device 31, which is connected to the first water tank 1 by a pipeline, and a first water replenishment electromagnetic valve 32 is further arranged between the pure water device 31 and the first water tank 1, which is controlled by the liquid level sensor 12 in the second water tank 2.

[0028] Please refer to Figure 1The filtering system 4 is arranged on the second water tank 2, and comprises a Y-shaped filter 41, a centrifugal pump 42, a resin tank 43, a filter 44 and a filtering pipeline 45. One end of the filtering pipeline 45 is arranged at the bottom of the second water tank 2, and the other end is fixed to the top of the second water tank 2 around the side of the water tank. The Y-shaped filter 41, the centrifugal pump 42, the resin tank 43 and the filter 44 are arranged in sequence on the filtering pipeline 45 from the bottom of the second water tank 2 along the guiding direction of the filtering pipeline 45. In the filtering process, some impurities in the water are removed by the Y-shaped filter 41 first, so as to ensure that the water quality can meet the working requirements. Then, the resin tank 43 further adsorbs the impurities and examples in the water. Finally, the water passes through the filter 44 and returns to the second water tank 2.

[0029] The electrolysis system 5 comprises an electrolysis pipeline 51, an electrolysis tank 52 and a heat exchange device 53. In an embodiment, one end of the electrolysis pipeline 51 is arranged in communication with the centrifugal pump 42, and the other end is arranged at the top of the first water tank 1. The electrolysis tank 52 is arranged on the electrolysis pipeline 51 and used for performing electrolysis reaction on the water flow passing through the electrolysis pipeline 51. The electrolysis tank 52 is arranged in communication with a hydrogen collection system on one side. The heat exchange device 53 is arranged between the electrolysis tank 52 and the centrifugal pump 42 and used for performing heat exchange on the water flow in the electrolysis pipeline 51, so as to control the temperature of the water to be between 50°C and 60°C. In an embodiment, the heat exchange device 53 is a fin heat exchanger 531. The electrolysis pipeline 51 passes through the fin heat exchanger 531. The fin heat exchanger 531 is arranged between the centrifugal pump 42 and the electrolysis tank 52. The fin heat exchanger 531 is provided with a heat exchange water inlet 532 and a heat exchange water outlet 533. The heat exchange water inlet 532 and the heat exchange water outlet 533 are arranged in communication through a heat exchange water pipeline. The heat exchange water pipeline passes through the fin heat exchanger 531 and is used for performing heat exchange on the liquid in the electrolysis pipeline 51. The heat exchange water inlet 532 is provided with a second water supplement electromagnetic valve 534 on one side, which is used for supplying heat exchange water to the part of the heat exchange water pipeline located in the fin heat exchanger 531.

[0030] In an embodiment, the electrolysis pipeline 51 is further provided with a pressure sensor 511. The pressure sensor 511 is used for detecting the pressure of the water flow in the electrolysis pipeline 51. The pressure sensor 511 is arranged between the fin heat exchanger 531 and the electrolysis tank 52.

[0031] Please refer to Figure 1The drainage system 6 includes two groups of drainage pipes 61 and a wastewater device 62, one of the drainage pipes 61 is connected with the first water tank 1 and the wastewater device 62, and the other drainage pipe 61 is connected with the centrifugal pump 42 and the wastewater device 62, and the overflow water in the first water tank 1 and the second water tank 2 is drained through the drainage pipes 61, in an embodiment, a manual drainage valve 611 is arranged on the drainage pipe 61 connecting the first water tank 1 and the wastewater device 62, and a drainage electromagnetic valve 612 is arranged on the drainage pipe 61 connecting the centrifugal pump 42 and the wastewater device 62.

[0032] Working principle:

[0033] The pure water enters the first water tank 1 through the first water supplementing electromagnetic valve 32 from the pure water device 31, and the first water tank 1 and the second water tank 2 are connected, so the first water tank 1 and the second water tank 2 are simultaneously water-supplemented, the liquid level is set by the liquid level sensor 12 in the second water tank 2, if the liquid level is high, the first water supplementing electromagnetic valve 32 is disconnected, otherwise it is closed, and the water supplementing of the two water tanks is paused when the liquid level reaches a certain level, and the excess water can also be drained through the manual drainage valve 611.

[0034] After the pure water in the two water tanks is supplemented, the water temperature does not reach the working temperature of the water electrolysis cell 52 (the temperature of the water needs to be 50-60℃ to reach the working temperature of the water electrolysis cell 52), at this time, the pure water in the second water tank 2 is pumped to the finned heat exchanger 531 through the centrifugal pump 42, and the water is heated to 50-60℃, another part of the water is drained to the wastewater device 62 through the drainage electromagnetic valve 612, and another part of the water is adsorbed by the resin tank 43 to remove impurities and ions in the water and then returned to the second water tank 2 through the filter 44, and in the water pumping process, it needs to pass through a Y-shaped filter 41 to remove some impurities in the water to ensure that the water quality can meet the working requirements.

[0035] The water heated by the finned heat exchanger 531 to the working temperature of the water electrolysis cell 52 is directly introduced into the water electrolysis cell 52 for water electrolysis, if the water temperature is higher than 60℃, the finned heat exchanger 531 cools the pure water to 50-60℃ through cooling water, and the cooling water enters the finned heat exchanger 531 through the second water supplementing electromagnetic valve 534 and flows out from the heat exchange water outlet 533 at the bottom of the finned heat exchanger 531.

[0036] The hydrogen and oxygen electrolyzed by the electrolytic cell 52 and the water, part of the hydrogen enters the hydrogen collection system, and part of the hydrogen is mixed with the water and oxygen and returns to the first water tank 1. At this time, the backflow of the water, oxygen and hydrogen mixed gas-water mixture has a pressure of about 3 MPa, which will cause the first vertical liquid level to fluctuate greatly, and the liquid level sensor 12 in the first water tank 1 will not be stable. However, since the connecting pipe between the two water tanks is at the bottom, the large fluctuation of the first water tank 1 will not affect the liquid level of the second water tank 2, and the liquid level sensor 12 in the second water tank 2 will be stable. The oxygen and hydrogen mixed in the backflow water are extracted to the atmosphere by the oxygen extraction fan 13 connected to the first water tank 1.

[0037] The PEM electrolytic water hydrogen production double water tank system provided by the application changes the single water tank in the PEM hydrogen production device into a double water tank system, and the first water tank 1 and the second water tank 2 are connected by a connecting pipe at the bottom of the two water tanks to realize communication, which ensures the volume of the water tank and the large water storage capacity. The water quantity in the system is sufficient, and the water flow entering the electrolytic cell 52 is sufficient. During the backflow process of the electrolytic cell 52, the backflow water is in the first water tank 1, and the pipe connecting the two water tanks is at the bottom, which will not affect the liquid level of the second water tank 2. The liquid level in the second water tank 2 is relatively stable. By starting the oxygen extraction fan 13, part of the oxygen and hydrogen electrolyzed in the backflow water in the first water tank 1 is extracted to the atmosphere. Since the oxygen extraction fan 13 is continuously started, the liquid level fluctuation in the second water tank 2 caused by the pressure change in the first water tank 1 will not occur, and the detection result of the liquid level sensor 12 in the second water tank 2 will not be affected, and the reading will be more accurate.

[0038] The PEM hydrogen production device double water tank system provided by the application can reduce the need for opening molds to customize water tanks of different sizes in different working environments, reduce the cost of opening molds, reduce the manufacturing cost, and improve the production efficiency. Also, it stabilizes the situation where the liquid level in the water tank fluctuates greatly due to the high backflow pressure, and the liquid level sensor reading is more accurate.

Claims

1. A dual-tank system for hydrogen production by PEM water electrolysis, comprising a water tank, a water inlet system, a filtration system, an electrolysis system, and a drainage system, characterized in that: There are two water tanks, which are placed in parallel and have their bottoms coplanar. A connecting pipe is provided at the bottom of the two water tanks to connect the two water tanks. The water inlet system is connected to one of the water tanks to supply pure water to the two water tanks. The filtration system is used to filter the incoming water flow to ensure that the water quality meets the working requirements. The electrolysis system is used to perform water electrolysis on the incoming pure water. The drainage system is used to discharge waste water.

2. A PEM water electrolysis hydrogen production dual water tank system according to claim 1, characterized in that: The two water tanks are the first water tank and the second water tank, respectively. The two water tanks are respectively provided with a temperature sensor and a liquid level sensor for detecting the temperature and liquid level height of the water flow in the water tanks. The first water tank is provided with an oxygen extraction fan for extracting oxygen and hydrogen in the first water tank into the atmosphere.

3. A PEM water electrolysis hydrogen production dual water tank system according to claim 2, characterized in that: The water inlet system includes a pure water device, which is connected to the first water tank through a pipeline. In addition, a first water replenishment solenoid valve is provided between the pure water device and the first water tank, and the first water replenishment solenoid valve is controlled by a liquid level sensor in the second water tank.

4. A PEM water electrolysis hydrogen production dual water tank system according to claim 2, characterized in that: The filtration system is arranged on the second water tank, and the filtration system includes a Y-shaped filter, a centrifugal pump, a resin tank, a filter and a filtration pipe, wherein one end of the filtration pipe is located at the bottom of the second water tank, and the other end surrounds one side of the water tank and is fixed on the top of the second water tank. The Y-shaped filter, centrifugal pump, resin tank and filter are all located on the filtration pipe and are arranged in sequence from the bottom of the second water tank along the guide direction of the filtration pipe.

5. A PEM water electrolysis hydrogen production dual water tank system according to claim 4, characterized in that: The electrolysis system includes an electrolysis pipe and an electrolytic cell. One end of the electrolysis pipe is connected to the centrifugal pump, and the other end is located on the top of the first water tank. The electrolytic cell is located on the electrolysis pipe and is used to perform an electrolysis reaction on the water flowing through the electrolysis pipe. One side of the electrolytic cell is connected to the hydrogen collection system.

6. A PEM water electrolysis hydrogen production dual water tank system according to claim 5, characterized in that: The electrolysis system further includes a heat exchange device, which is located between the electrolytic cell and the centrifugal pump and is used to exchange heat with the water flow in the electrolysis pipe to control the water temperature between 50°C and 60°C.

7. A PEM water electrolysis hydrogen production dual water tank system according to claim 6, characterized in that: The heat exchange device is a fin heat exchanger, the electrolysis pipeline is arranged through the fin heat exchanger, the fin heat exchanger is located between the centrifugal pump and the electrolytic cell, the fin heat exchanger is provided with a hot water inlet and a hot water outlet, the hot water inlet and the hot water outlet are connected through a hot water pipe, and the hot water pipe passes through the fin heat exchanger for exchanging heat with the liquid in the electrolysis pipeline, and a second water supply solenoid valve is provided on one side of the hot water inlet for supplying hot water to the part of the hot water pipe located in the fin heat exchanger.

8. A dual-tank system for hydrogen production by PEM water electrolysis according to claim 7, characterized in that: The electrolysis pipe is further provided with a pressure sensor, which is used to detect the water flow pressure in the electrolysis pipe. The pressure sensor is located between the fin heat exchanger and the electrolysis tank.

9. A PEM water electrolysis hydrogen production dual water tank system according to claim 4, characterized in that: The drainage system includes two sets of drainage pipes and wastewater devices, one of which is connected to the first water tank and the wastewater device, and the other is connected to the centrifugal pump and the wastewater device. The overflowing water in the first water tank and the second water tank is discharged through the drainage pipe.

10. A dual-tank system for hydrogen production by PEM water electrolysis according to claim 9, characterized in that: A manual drain valve is provided on the drain pipe connecting the first water tank and the wastewater device, and a drain solenoid valve is provided on the drain pipe connecting the centrifugal pump and the wastewater device.

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