Drainage emptying device for water electrolysis hydrogen production system

Abstract

The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a drainage emptying device for a water electrolysis hydrogen production system, which comprises a body, a gas outlet pipe arranged at the top of the body, a water replenishing inlet pipe and a condensate inlet pipe arranged on the side wall of the body, and the water replenishing inlet pipe and the condensate inlet pipe are arranged at one end close to the gas outlet pipe. The condensate inlet pipe is used for being connected with a condensate outlet of the gas-liquid separation device; the supporting sieve plate is arranged close to the bottom of the body and matched with the inner wall of the body, small holes are densely formed in the supporting sieve plate, and a water sealing cap is arranged on the upper surface of the supporting sieve plate; the condensate outlet adjusting valve is arranged on one side of the body and connected with a condensate outlet pipeline, the condensate outlet pipeline penetrates through the side wall of the body and extends into the water seal cap, and a gap is reserved between the tail end of the condensate outlet pipeline and the bottom of the water seal cap. The problem that a condensate outlet of an existing water seal structure carries hydrogen seriously is solved.

Description

Technical field

[0001] The utility model relates to the technical field of water electrolysis hydrogen production, in particular to a liquid discharge and emptying device for a water electrolysis hydrogen production system. [Background Technology]

[0002] With the continuous development of the hydrogen energy market, the application scenarios and scale of water electrolysis hydrogen production equipment have become more diverse, and the duration of continuous or intermittent application has increased rapidly. Due to safety and environmental assessment factors, the market has put forward higher requirements for the environmental protection, safety and stability of hydrogen production equipment. During the operation of the water electrolysis hydrogen production device, the gas-liquid separation device equipped with the electrolyzer will discharge a small amount of condensate at the end of the device after completing the gas-liquid separation process. Since the condensate discharged by the gas-liquid separation device may carry a small amount of hydrogen or oxygen, in order to prevent hydrogen from accumulating in the hydrogen production room and causing safety accidents, the gas carried by the condensate needs to be separated and led out of the hydrogen production room. The most commonly used method in the industry is to connect a gas water seal tank or water tank to the outlet of the condensate pipeline of the gas-liquid separation device to introduce hydrogen into the atmosphere for venting.

[0003] A Chinese utility model patent application, number 202321575997.4, filed on June 20, 2023, discloses a condensate removal device for an alkaline water electrolysis hydrogen production system. The device comprises a first solenoid valve, a liquid accumulator, a manual ball valve, a steam trap, and a second solenoid valve, all connected in sequence to a gas-liquid separator. Condensate contained in the separated hydrogen or oxygen accumulates in the liquid accumulator and is discharged through the steam trap to a drainage pipeline. The device also includes a water seal structure, which is positioned in front of the drainage pipeline. The water seal structure is used only to monitor drainage conditions, and the device's high structural coordination leads to poor stability.

[0004] In addition, the water seal structure used in the existing technology has the following problems in application: ① The condensate discharged from the outlet of the existing water seal structure carries a lot of hydrogen and cannot form an effective water seal; ② The outlet of the water seal structure adopts a gravity flow method, which is rough in control.

[0005] Since the water electrolysis hydrogen production equipment used in the early market was mostly single small or medium-sized equipment, the condensate generated by the operation of the gas-liquid separation device was small and had no reuse value, so the condensate treatment method was rough. In recent years, with the continuous development of the hydrogen energy industry, the water electrolysis hydrogen production equipment used in the market is mostly large-scale hydrogen production equipment, and there are scenarios where multiple large-scale hydrogen production equipment are operating at the same time. Therefore, the gas-liquid separation device generates a lot of condensate during operation, and the amount of hydrogen carried also increases accordingly. During the operation of the water electrolysis hydrogen production equipment, in order to achieve the safety, environmental protection and stability of the long-term operation of the hydrogen production equipment, the condensate needs to be recovered and reused under the premise of ensuring that the hydrogen is discharged in time. The hydrogen water seal structure currently used in the market has poor application effect and cannot take into account the process requirements of condensate recovery and reuse and hydrogen discharge. Therefore, in order to improve the comprehensive performance of the product, the existing structure needs to be further optimized. [Utility Model Content]

[0006] The utility model provides a liquid draining and emptying device for a water electrolysis hydrogen production system, so as to solve the problem that the condensate outlet of the existing water seal structure contains serious hydrogen.

[0007] The utility model is realized through the following technical solutions, and provides a drainage and venting device for a water electrolysis hydrogen production system, comprising: a main body, a gas outlet pipe is provided on the top of the main body, a water supply inlet pipe and a condensate inlet pipe are provided on the side wall of the main body, the water supply inlet pipe and the condensate inlet pipe are arranged near one end of the gas outlet pipe, and the condensate inlet pipe is used to connect the discharge outlet of the condensate of the gas-liquid separation device; a supporting sieve plate, the supporting sieve plate is arranged near the bottom of the main body, the supporting sieve plate is adapted to the inner wall of the main body, small holes are densely opened on the supporting sieve plate, and a water seal cap is provided on the upper surface of the supporting sieve plate; a condensate outlet regulating valve, the condensate outlet regulating valve is arranged on one side of the main body, the condensate outlet regulating valve is connected to a condensate outlet pipe, the condensate outlet regulating valve can effectively adjust the size of the condensate water outlet, the condensate outlet pipe passes through the side wall of the main body and extends into the water seal cap, and a gap is left between the end of the condensate outlet pipe and the bottom of the water seal cap.

[0008] Specifically, the diameter of the gas outlet pipe is larger than the diameter of the condensate outlet pipe.

[0009] Specifically, the condensate inlet pipe extends downward and penetrates the supporting screen plate.

[0010] Specifically, a maintenance drain valve is provided at the bottom end of the body.

[0011] Specifically, the main body is fixed on the ground through support columns.

[0012] Specifically, the gas outlet pipe is externally connected to a venting pipe.

[0013] Specifically, the gap between the end of the condensate outlet pipe and the bottom of the water seal cap is larger than the outer diameter of the condensate outlet pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) A condensate outlet regulating valve is provided, and the outlet flow control regulating capacity of the device can be increased by adjusting the opening of the condensate outlet regulating valve. The regulating valve is rotated and the opening of the condensate outlet regulating valve is maintained after observing that no gas is discharged from the outlet. This can effectively prevent hydrogen from accumulating at the condensate collection point, avoid safety accidents caused by hydrogen accumulation in the confined space of the downstream condensate collection point, provide safety guarantees for the stable operation of the hydrogen production equipment, and improve the overall safety of the product operation.

[0016] (2) A water seal cap is set at the condensate outlet pipe port. Since hydrogen has a small molecular weight and cannot enter the condensate outlet pipe protected by the water seal cap by sinking, it can effectively block the phenomenon of hydrogen being carried by the condensate outlet, solving the problem of serious hydrogen carrying at the condensate outlet of the existing water seal structure. In addition, the structure is simple, the processing cost and difficulty are low, and it is easy to process and manufacture;

[0017] (3) The supporting sieve plate is set at the bottom of the main body, and the condensate inlet pipe is extended under the supporting sieve plate. On the one hand, the gas-containing condensate entering the drainage and emptying device can be broken up, and the gravity sedimentation principle can be used to improve the gas-liquid separation effect, increase the escape rate of hydrogen from the liquid, and introduce hydrogen into the top gas outlet pipe for emptying in time, thereby effectively avoiding hydrogen accumulation and ensuring the stable operation of the device. On the other hand, it plays a supporting and fixing role, which can fix the condensate inlet pipe to prevent the pipeline from vibrating after the liquid enters, thereby ensuring the stable operation of the device.

Brief Description of the Drawings

[0018] Figure 1 This is a simplified flow chart of a liquid discharge and venting device for a water electrolysis hydrogen production system according to the present invention;

[0019] Figure 2 This is a structural diagram of a liquid discharge and emptying device for a water electrolysis hydrogen production system according to the utility model.

[0020] Figure 3 The utility model is a schematic diagram of the structure of a water seal cap of a liquid discharge and venting device for a water electrolysis hydrogen production system.

[0021] In the attached figure, 1, condensate inlet pipe; 2, water inlet pipe; 3, gas outlet pipe; 4, condensate outlet regulating valve; 41, condensate outlet pipe; 5, water seal cap; 6, support screen plate; 7, maintenance drain valve; 8, medium water. [Specific implementation method]

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1-Figure 3 The utility model provides a liquid discharge and emptying device for a water electrolysis hydrogen production system, comprising a body, a supporting sieve plate 6 and a condensate outlet regulating valve 4;

[0024] like Figure 2 As shown, the main body is can-shaped and placed vertically, with a gas outlet pipe 3 provided on the top of the main body, and a water supply inlet pipe 2 and a condensate inlet pipe 1 provided on the side wall of the main body near the gas outlet pipe 3. The water supply inlet pipe 2 is used to add water to the main body to a certain position to form a water seal, and can also be used to provide the liquid required for internal water washing. The condensate inlet pipe 1 is used to connect the condensate discharge outlet of the gas-liquid separation device, and the gas-containing condensate periodically discharged by the gas-liquid separation device is introduced into the device through the condensate inlet pipe 1.

[0025] The supporting sieve plate 6 is fixed at a position close to the bottom of the main body, and the supporting sieve plate 6 is adapted to the inner wall of the main body. Small holes are densely opened on the supporting sieve plate 6. A water seal cap 5 is provided on the upper surface of the supporting sieve plate 6. The hydrogen carried by the condensate floats to the top of the drainage and emptying device after passing through the supporting sieve plate 6, and flows out of the device from the gas outlet pipe 3 at the top of the drainage and emptying device.

[0026] The condensate outlet regulating valve 4 is arranged on one side of the main body, and the condensate outlet regulating valve 4 is connected to the condensate outlet pipe 41. The condensate outlet pipe 41 extends through the side wall of the main body into the water seal cap 5. A gap is left between the end of the condensate outlet pipe 41 and the bottom of the water seal cap 5, and a local water seal structure can be formed at the pipe mouth of the supporting sieve plate 6 to prevent hydrogen floating from the supporting sieve plate 6 from accidentally entering the condensate outlet pipe 41. Since the molecular weight of hydrogen is extremely small, it cannot enter the condensate outlet pipe 41 protected by the water seal cap 5 by sinking after passing through the porous supporting sieve plate 6, thereby effectively blocking the problem of hydrogen being carried by the condensate outlet, and can effectively play the role of the water seal cap in preventing gas from flowing back to the condensate pipe outlet, thereby solving the problem of gas carried by the condensate outlet liquid.

[0027] The arrangement of the condensate outlet regulating valve 4 can adjust the liquid flow rate according to the on-site drainage situation. In this embodiment, the specific operation is that the condensate outlet regulating valve 4 can be fully opened when the device is used for the first time. When gas is carried out of the condensate outlet, foam will be generated at the condensate outlet, accompanied by the sound of air flow. The outlet drainage situation is observed. If there is no gas carried out, the opening of the condensate outlet regulating valve 4 is maintained at this time; if there is gas carried out, the opening of the condensate outlet regulating valve 4 is gradually closed, and the outlet drainage situation is simultaneously observed until there is no gas carried out. The closing action is stopped and the opening of the condensate outlet regulating valve 4 is maintained at this time. By setting the condensate outlet regulating valve 4 and the water seal cap 5, it is ensured that there is no gas discharged from the condensate outlet regulating valve 4, thereby solving the problem of hydrogen in the condensate discharged from the gas-liquid separation device, preventing hydrogen from accumulating at the condensate collection point, and avoiding the risk of safety accidents caused by hydrogen accumulation in confined spaces.

[0028] Furthermore, the diameter of the gas outlet pipe 3 is larger than the diameter of the condensate outlet pipe 41. In this embodiment, the gas venting outlet pipe 3 is much larger than the condensate outlet pipe 41, facilitating the escape and discharge of the rising hydrogen. Simultaneously, by adjusting the opening of the condensate outlet regulating valve 4, the difficulty of hydrogen being discharged from the condensate outlet pipe 41 is increased.

[0029] Furthermore, the condensate inlet pipe 1 extends downward through the support sieve plate 6. This allows the condensate to be introduced into the bottom of the support sieve plate 6 through the condensate inlet pipe 1. On the one hand, since hydrogen has a small molecular weight and a density much lower than that of water, the gas-containing condensate is introduced into the bottom of the device through the condensate inlet pipe 1. The support sieve plate 6 structure can break up the gas-liquid mixture of the gas-containing condensate entering the drainage and venting device, facilitating gas-liquid separation and increasing the rate at which hydrogen escapes from the liquid. On the other hand, the support sieve plate 6 can also support and fix the condensate inlet pipe 1, preventing vibration after the pipe enters the liquid, thereby ensuring stable operation of the device.

[0030] Furthermore, a maintenance drain valve 7 is provided at the bottom of the body. In this embodiment, the maintenance drain valve 7 at the bottom is normally closed when the drain and emptying device is in normal use, and is opened only during maintenance and cleaning to discharge residual liquid.

[0031] Furthermore, the main body is fixed on the ground through support columns.

[0032] Furthermore, the gas outlet pipe 3 is externally connected to a venting pipe, and hydrogen can be discharged into the atmosphere through the venting pipe.

[0033] Furthermore, the gap between the end of the condensate outlet pipe 41 and the bottom of the water seal cap 5 is larger than the outer diameter of the condensate outlet pipe 41. In this embodiment, the gap is set larger than the outer diameter of the outlet pipe to facilitate smooth passage of liquid.

[0034] Working process:

[0035] like Figure 1 As shown in the figure, the simplified flow of the drain and vent system for a water electrolysis hydrogen production system is as follows: condensate formed during the operation of the gas-liquid separation unit enters the drain and vent system through valve V1. After the gas-containing condensate is processed by the drain and vent system, hydrogen is vented from the top of the unit through a vent pipe to the atmosphere, and the gas-free condensate flows through valve V3 to a condensate collection point. Furthermore, the liquid required to form the water seal during initial use of the drain and vent system, as well as the liquid required for internal water washing, enters the unit through valve V2. Residual liquid within the unit during maintenance can be discharged through valve V4 at the maintenance drain port.

[0036] Specific as Figure 2 As shown, before using the draining and emptying device, water is added through the water inlet pipe 2 until the liquid level rises to the position of the medium water 8 to form a water seal to prevent gas from entering the condensate outlet pipe 41.

[0037] During the operation of the water electrolysis hydrogen production equipment, the gas-liquid separation device periodically discharges gas-containing condensate to the condensate inlet pipe 1, and the condensate is introduced into the bottom of the drainage and venting device through the condensate inlet pipe 1. The hydrogen carried by the condensate floats to the top of the drainage and venting device through the small holes on the supporting sieve plate 6, flows out of the device from the gas venting outlet pipe 3 at the top of the device, and is discharged into the atmosphere through the connected venting pipe.

Claims

1. A liquid discharge and emptying device for a water electrolysis hydrogen production system, characterized in that: include: A main body, wherein a gas outlet pipe (3) is provided on the top of the main body, and a water supply inlet pipe (2) and a condensate inlet pipe (1) are provided on the side wall of the main body, wherein the water supply inlet pipe (2) and the condensate inlet pipe (1) are provided at one end close to the gas outlet pipe (3), and the condensate inlet pipe (1) is used to connect to the discharge outlet of the condensate of the gas-liquid separation device; A supporting sieve plate (6), the supporting sieve plate (6) is arranged near the bottom of the body, the supporting sieve plate (6) is adapted to the inner wall of the body, small holes are densely opened on the supporting sieve plate (6), and a water seal cap (5) is provided on the upper surface of the supporting sieve plate (6); A condensate outlet regulating valve (4) is provided on one side of the main body, the condensate outlet regulating valve (4) is connected to a condensate outlet pipe (41), the condensate outlet regulating valve (4) is used to adjust the size of the condensate outlet water, the condensate outlet pipe (41) passes through the side wall of the main body and extends into the water seal cap (5), and a gap is left between the end of the condensate outlet pipe (41) and the bottom of the water seal cap (5).

2. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: The diameter of the gas outlet pipe (3) is greater than the diameter of the condensate outlet pipe (41).

3. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: The condensate inlet pipe (1) extends downward and penetrates the supporting sieve plate (6).

4. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: A maintenance drain valve (7) is provided at the bottom end of the body.

5. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: The main body is fixed on the ground through support columns.

6. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: The gas outlet pipe (3) is externally connected to a venting pipe.

7. The liquid draining and venting device for a water electrolysis hydrogen production system according to claim 1, characterized in that: The gap between the end of the condensate outlet pipe (41) and the bottom of the water seal cap (5) is larger than the outer diameter of the condensate outlet pipe (41).

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