A wastewater recovery device for hydrogen production systems

Abstract

This utility model discloses a wastewater recovery device for a hydrogen production system, relating to the field of water electrolysis hydrogen production technology. It includes a liquid collector and a differential pressure transmitter. Water generated during the gas-water separation process enters the liquid collector via a wastewater discharge pipe. The sensing terminals of the differential pressure transmitter are installed on the upper and lower sides of the liquid collector, respectively, and the differential pressure transmitter is used to acquire changes in the liquid level in the liquid collector. The bottom of the liquid collector is connected to a hydrogen-oxygen separator via a connecting pipe. A valve one and a valve two are respectively installed on the wastewater discharge pipe and the connecting pipe. The differential pressure transmitter is used to precisely control the liquid level in the liquid collector, preventing valves from opening accidentally due to level fluctuations. The liquid level in the liquid collector is controlled by a dual-valve system; when alkaline solution flows back, the connection between the liquid collector and the system is cut off to prevent backflow due to level imbalance caused by system fluctuations. All wastewater discharged from the system is recovered, achieving zero discharge while maximizing the utilization of raw materials.

Description

Technical Field

[0001] This utility model relates to the field of water electrolysis for hydrogen production technology, and in particular to a wastewater recovery device for a hydrogen production system. Background Technology

[0002] Combining renewable energy power with water electrolysis technology to produce high-purity hydrogen and oxygen, and then using the resulting gases directly or converting them into electricity, is a current trend in resource utilization that aims to increase the utilization rate and proportion of renewable energy.

[0003] In the process of producing hydrogen by water electrolysis, hydrogen and oxygen enter the gas cooling stage after being separated by a hydrogen-oxygen separator. The cooled gas needs to be further separated by gas-water separation to remove water from the gas. In traditional technology, most of the water removed from the gas is discharged externally, but this discharge method can easily cause environmental pollution and waste of system raw materials. Utility Model Content

[0004] The purpose of this invention is to provide a wastewater recovery device for hydrogen production systems to solve the problems existing in the prior art, recover wastewater discharged from hydrogen production systems, achieve zero emissions while maximizing the utilization of raw materials.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a wastewater recovery device for a hydrogen production system, including a liquid collector and a differential pressure transmitter. Water generated during the gas-water separation process enters the liquid collector through a wastewater discharge pipeline. The sensing terminals of the differential pressure transmitter are respectively installed on the upper and lower sides of the liquid collector. The differential pressure transmitter is used to acquire changes in the liquid level in the liquid collector. The bottom end of the liquid collector is connected to a hydrogen-oxygen separator through a connecting pipeline. A valve one and a valve two are respectively installed on the wastewater discharge pipeline and the connecting pipeline.

[0006] In one embodiment, both valve one and valve two are pneumatic ball valves.

[0007] In one embodiment, a PLC controller is also included, and the differential pressure transmitter, valve one, and valve two are all wired to the PLC controller.

[0008] In one embodiment, when the differential pressure transmitter detects that the liquid collector is at a low liquid level, valve one is closed and valve two is open.

[0009] In one embodiment, when the differential pressure transmitter detects that the liquid collector is at a high liquid level, valve one is in the open state and valve two is in the closed state.

[0010] In one embodiment, when the liquid collector is in a draining state, the second valve is closed.

[0011] The present invention achieves the following beneficial technical effects compared to the prior art:

[0012] This utility model discloses a wastewater recovery device for a hydrogen production system, comprising a liquid collector and a differential pressure transmitter. Water generated during the gas-liquid separation process enters the liquid collector via a wastewater discharge pipe. The sensing terminals of the differential pressure transmitter are installed on the upper and lower sides of the liquid collector, respectively, and the differential pressure transmitter is used to acquire changes in the liquid level within the liquid collector. The bottom of the liquid collector is connected to a hydrogen-oxygen separator via a connecting pipe. Valve one and valve two are respectively installed on the wastewater discharge pipe and the connecting pipe. The differential pressure transmitter is used to precisely control the liquid level in the liquid collector, preventing accidental valve opening due to level fluctuations. The liquid level in the liquid collector is controlled by dual valves; when alkali solution flows back, the connection between the liquid collector and the system is cut off to prevent backflow due to level imbalance caused by system fluctuations. All wastewater discharged from the system is recovered, achieving zero discharge while maximizing the utilization of raw materials. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the wastewater recovery device used in a hydrogen production system.

[0015] Among them, 1. steam-water separator; 2. liquid collector; 3. differential pressure transmitter; 4. hydrogen-oxygen separator. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The purpose of this invention is to provide a wastewater recovery device for hydrogen production systems to solve the problems existing in the prior art, recover wastewater discharged from hydrogen production systems, achieve zero emissions while maximizing the utilization of raw materials.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, this utility model provides a wastewater recovery device for a hydrogen production system, including a liquid collector 2 and a differential pressure transmitter 3. Water generated during the gas-water separation process enters the liquid collector 2 through a wastewater discharge pipeline. The sensing terminals of the differential pressure transmitter 3 are respectively installed on the upper and lower sides of the liquid collector 2. The differential pressure transmitter 3 is used to obtain the liquid level change in the liquid collector 2. The bottom end of the liquid collector 2 is connected to a hydrogen-oxygen separator 4 through a connecting pipeline. A valve one and a valve two are respectively installed on the wastewater discharge pipeline and the connecting pipeline.

[0020] In one embodiment, both valve one and valve two are pneumatic ball valves.

[0021] In one embodiment, a PLC controller is also included, and differential pressure transmitter 3, valve one, and valve two are all wired to the PLC controller.

[0022] In one embodiment, when the differential pressure transmitter 3 detects that the liquid collector 2 is at a low liquid level, valve one is closed and valve two is open.

[0023] In one embodiment, when the differential pressure transmitter 3 detects that the liquid collector 2 is at a high liquid level, valve one is in the open state and valve two is in the closed state.

[0024] In one embodiment, when the liquid collector 2 is in the draining state, valve 2 is closed.

[0025] Specifically, the working principle of the wastewater recovery device in the hydrogen production system of this utility model is as follows:

[0026] When the system starts operating, valve two is in the open position (FC valve is required). Liquid droplets entrained in the gas flow into the liquid collector 2 by gravity after being separated by the gas-water separator 1. Differential pressure transmitters 3 are installed at the top and bottom of the liquid collector 2. The liquid level in the liquid collector 2 is calculated based on the high and low pressures of the differential pressure transmitters 3. The PLC controller sets the high and low liquid level control of the differential pressure transmitters 3. When the liquid collector 2 is at a low liquid level, the differential pressure transmitter 3 sends a signal to valve one to close and valve two to open. When the liquid level rises to the system-set high liquid level value, the PLC controller controls valve two to close and valve one to open. The purpose of controlling valve two to close during drainage is to prevent system pressure fluctuations from causing fluctuations in the separator's liquid level, which could lead to alkali backflow.

[0027] The advantages of the wastewater recovery device for hydrogen production systems of this invention are as follows:

[0028] 1. Use differential pressure transmitter 3 to accurately control the liquid level of liquid collector 2 to prevent the valve from opening accidentally due to liquid level fluctuations;

[0029] 2. The liquid level of collector 2 is controlled by a dual valve. When the alkaline solution flows back, the connection between collector 2 and the system is cut off to prevent backflow caused by liquid level imbalance due to system fluctuations.

[0030] 3. All wastewater discharged into the system is recycled to achieve zero emissions while maximizing the utilization of raw materials.

[0031] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A blowdown recovery device for a hydrogen production system, characterized in that: It includes a liquid collector and a differential pressure transmitter. The water generated during the steam-water separation process enters the liquid collector through the blowdown pipeline. The sensing ends of the differential pressure transmitter are respectively installed on the upper and lower sides of the liquid collector, and the differential pressure transmitter is used to obtain the liquid level change in the liquid collector. The bottom end of the liquid collector is connected to a hydrogen-oxygen separator through a connecting pipeline. A valve one and a valve two are respectively arranged on the blowdown pipeline and the connecting pipeline.

2. The blowdown recovery device for a hydrogen production system according to claim 1, wherein: Both the valve one and the valve two adopt pneumatic ball valves.

3. The blowdown recovery device for a hydrogen production system according to claim 1, characterized in that: It further includes a PLC controller, and the differential pressure transmitter, the valve one and the valve two are all electrically connected to the PLC controller.

4. The blowdown recovery device for a hydrogen production system according to claim 1, wherein: When the differential pressure transmitter detects that the liquid collector is at a low liquid level, the valve one is in a closed state and the valve two is in an open state.

5. The blowdown recovery device for a hydrogen production system according to claim 1, characterized in that: When the differential pressure transmitter detects that the liquid collector is at a high liquid level, the valve one is in an open state and the valve two is in a closed state.

6. The blowdown recovery device for a hydrogen production system according to claim 1, characterized in that: When the liquid collector is in a liquid discharging state, the valve two is closed.

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