Electrolytic hydrogen production gas-liquid separation system capable of preventing alkali liquor from flowing backwards

Abstract

The utility model relates to an electrolytic hydrogen production gas-liquid separation system capable of preventing alkali liquor from flowing backwards, which comprises a washer and a gas-liquid separator, a liquid overflow port of the washer is connected with a water inlet of the gas-liquid separator through an overflow pipeline, and the liquid overflow port of the washer is higher than the water inlet of the gas-liquid separator. The overflow pipeline is arranged to be a U-shaped bent pipeline, alkali liquor is contained in the U-shaped bent pipeline, and a liquid sealing device is formed. According to the utility model, the safe and reliable operation of the gas-liquid separation system is realized, even if the load fluctuation of the system is larger, alkali liquor in the gas-liquid separator can be prevented from flowing back to the washer through the overflow pipeline, and the phenomenon of backflow of the alkali liquor is avoided.

Description

Technical Field

[0001] The utility model relates to an electrolytic hydrogen production gas-liquid separation system for preventing lye backflow, belonging to the technical field of improvement of the system structure of electrolytic hydrogen production. Background Technique

[0002] The existing alkaline electrolytic water hydrogen production technology has been relatively mature. Usually, KOH solution is used as the electrolyte, and hydrogen and oxygen are generated after electrolysis. Since the electrolytic cell requires a large current during operation, the temperature of the electrolytic cell is relatively high. The hydrogen and oxygen generated after electrolysis have a relatively high temperature, and when the gas flow rate in the system is relatively high, a certain amount of lye will be entrained. The hydrogen and oxygen entraining lye first carry out lye recovery in their respective gas-liquid separators. However, the gas-liquid separator usually cannot completely separate the lye. The hydrogen and oxygen coming out of the gas-liquid separator need to further go to the scrubber to further separate the lye to improve the cleanliness of the gas. Lye separation is particularly important in the electrolytic water hydrogen production system. If the lye cannot be completely separated, the loss of lye is not only a waste of resources, resulting in the loss of lye. The presence of lye in hydrogen and oxygen has many adverse effects on gas quality, purification treatment and analytical instruments.

[0003] The patent application with the patent publication number CN 103526222 A discloses a hydrogen-oxygen scrubber for water electrolysis hydrogen production, which is installed between the separator and the gas cooler. In particular, the main body of the hydrogen-oxygen scrubber is a scrubbing chamber filled with electrolytic raw water. The scrubbing chamber is connected with an intake pipe on the side wall. One end of the intake pipe is connected to the exhaust port of the separator, and the other end of the intake pipe extends below the liquid level of the electrolytic raw water in the scrubbing chamber. An air outlet is provided at the top of the scrubbing chamber, and an overflow port communicating with the separator is provided on the side wall of the scrubbing chamber.

[0004] The patent application with the patent publication number CN 113289474 A effectively integrates multiple functions of collection, washing and drying in the shell, so that the washing device can perform multiple treatment processes.

[0005] Although there are many current studies on scrubbers, none of them have studied the overflow pipe for transporting the recovered lye from the scrubber to the gas-liquid separator. In actual production, due to the presence of gas in the scrubber and the gas-liquid separator and the influence of gas temperature, the air pressure in the tank above the liquid level also fluctuates. The lye in the gas-liquid separator will also flow back into the scrubber, resulting in a significant reduction in the washing effect of oxygen and hydrogen in the scrubber. The existing industry has not analyzed and studied this problem. The overflow pipe outlet of the existing hydrogen production system scrubber is directly inserted below the liquid level of the separator. When the pressure difference between the separator and the scrubber is large, there will be a risk of lye backflow.

[0006] Based on this, it is necessary to develop a device that can effectively prevent lye from separating

[0007] The gas-liquid separation system that prevents the backflow of liquid into the scrubber to ensure the safe and stable operation of the system and equipment. Summary of the Invention

[0008] In order to solve the above problems, the utility model discloses an electrolytic hydrogen production gas-liquid separation system for preventing the backflow of lye, and its specific technical solution is as follows:

[0009] An electrolytic hydrogen production gas-liquid separation system for preventing the backflow of lye, including a scrubber and a gas-liquid separator. The top of the scrubber is provided with an air outlet, the side wall is provided with an air inlet and a liquid overflow port, a water replenishment port is provided near the top position, and a sewage discharge port is provided at the bottom; the liquid overflow port of the scrubber is connected to the water inlet of the gas-liquid separator through an overflow pipe, and the height of the liquid overflow port of the scrubber is higher than the height of the water inlet of the gas-liquid separator. The overflow pipe is arranged as a U-shaped bent pipe, and there is lye in the U-shaped bent pipe, forming a liquid seal device.

[0010] Further, the air inlet of the scrubber is connected to the air outlet of the gas-liquid separator through a pipe. After the pipe in the air inlet of the scrubber is inserted into the scrubber, it extends below the liquid level in the scrubber.

[0011] Further, the height of the air inlet of the scrubber is higher than the liquid overflow port of the scrubber.

[0012] Further, the scrubber is a vertical scrubber or a horizontal scrubber, and the gas-liquid separator is a vertical gas-liquid separator or a horizontal gas-liquid separator.

[0013] Further, the U-shaped turning part of the U-shaped bent pipe is located inside or outside the gas-liquid separator.

[0014] Further, the bottom height of the U-shaped bend of the U-shaped bent pipe is close to the bottom height of the gas-liquid separator, and the top height of the U-shaped bend is close to the top height of the gas-liquid separator.

[0015] Further, a water replenishing device is connected to the raw water inlet at the top of the scrubber, and a filter is provided between the water replenishing device and the water replenishment port.

[0016] Further, the scrubber is a hydrogen scrubber or an oxygen scrubber, and the gas-liquid separator is a hydrogen gas-liquid separator or an oxygen gas-liquid separator;

[0017] When the scrubber is a hydrogen scrubber, the hydrogen gas-liquid separator is connected to it;

[0018] When the scrubber is an oxygen scrubber, the oxygen gas-liquid separator is connected to it.

[0019] The beneficial effects of the utility model are:

[0020] In addition to the pipelines for normal system operation of the present utility model, the overflow pipeline for connecting the scrubber and the gas-liquid separator for the reuse of lye is arranged as a U-shaped bent pipeline. There is lye inside the turning point of the U-shaped bent pipeline to form a U-shaped liquid seal device, so as to ensure that the lye in the gas-liquid separator will not flow back into the scrubber in the hydrogen production system.

[0021] The present utility model also installs a precision filter on the raw water inlet pipeline of the scrubber to reduce impurities caused by improper storage of raw water, and the carried impurities enter the hydrogen production system. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present utility model,

[0023] Figure 2 is a schematic diagram of the overflow pipeline of the present utility model built in the gas-liquid separator,

[0024] Figure 3 is a schematic diagram of the overflow pipeline of the present utility model placed outside the gas-liquid separator,

[0025] List of Reference Numerals: 1—Scrubber overflow port, 2—Scrubber gas outlet, 3—Raw water inlet, 4—Filter, 5—Scrubber gas inlet, 6—Overflow pipeline, 7—U-shaped bent pipeline, 8—Scrubber, 9—Gas-liquid separator. Detailed Embodiments

[0026] The present utility model will be further clarified below in conjunction with the drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0027] Combined with the attached Figure 1 It can be seen that the present utility model includes a scrubber 8 and a gas-liquid separator 9. The scrubber 8 is provided with a scrubber overflow port 1, a scrubber gas outlet 2, a raw water inlet 3, and a scrubber gas inlet 5.

[0028] The raw water inlet 3 is connected to a water replenishing device or a water replenishing system, and a filter 4 for precisely filtering the raw water is arranged between the water replenishing device / water replenishing system and the raw water inlet 3.

[0029] The liquid overflow port 1 of the scrubber is connected to the water inlet of the gas-liquid separator 9 through an overflow pipeline 6. The height of the scrubber overflow port 1 is higher than the height of the water inlet of the gas-liquid separator, forming an overflow height potential energy. The overflow pipeline 6 is arranged as a U-shaped bent pipeline 7, and there is lye in the U-shaped bent pipeline 7 to form a liquid seal device, that is, a U-shaped liquid seal.

[0030] The inlet of the scrubber is connected to the outlet of the gas-liquid separator through a pipeline. After the pipeline in the inlet of the scrubber is inserted into the scrubber, it extends below the liquid level in the scrubber, so that the gas entering the scrubber is removed of the lye.

[0031] The height of the inlet of the scrubber is higher than the liquid overflow outlet of the scrubber. Let the inlet height of the scrubber enter above the scrubbing liquid level to prevent liquid from entering the inlet pipeline of the scrubber.

[0032] In the present utility model, the scrubber can be either a vertical scrubber or a horizontal scrubber, and the gas-liquid separator can be either a vertical gas-liquid separator or a horizontal gas-liquid separator.

[0033] In the present utility model, the U-shaped turning part of the U-shaped bend pipeline can be located either inside or outside the gas-liquid separator. Figure 2 It is a schematic diagram of the overflow pipeline of the present utility model being built inside the gas-liquid separator. Figure 3 It is a schematic diagram of the overflow pipeline of the present utility model being built outside the gas-liquid separator.

[0034] In order to have a larger liquid seal stroke, the bottom height of the U-shaped bend of the U-shaped bend pipeline is close to the bottom height of the gas-liquid separator, and the top height of the U-shaped bend is close to the top height of the gas-liquid separator.

[0035] In the present utility model, the scrubber can be either a hydrogen scrubber or an oxygen scrubber, and the gas-liquid separator can be either a hydrogen liquid separator or an oxygen liquid separator; however, there is a one-to-one matching relationship between them. When the scrubber is a hydrogen scrubber, the one connected to it is a hydrogen liquid separator; when the scrubber is an oxygen scrubber, the one connected to it is an oxygen liquid separator.

[0036] The following gives an embodiment of the use state of the present utility model, which specifically includes the following steps:

[0037] Step 1: During the operation of the hydrogen production system, raw water is added to the scrubber through the raw water inlet 3, and continuous water replenishment is carried out.

[0038] Step 2: During the operation of the hydrogen production system, the scrubbing liquid in the scrubber 8 flows into the gas-liquid separator 9 through the U-shaped bend pipeline 7 formed by the overflow pipeline 6.

[0039] Step 3: The outlet of the U-shaped bend pipeline 7 is arranged at the top of the gas-liquid separator 9, which can well avoid the backflow of the lye in the gas-liquid separator 9 to the scrubber 8.

[0040] Through the structural design of the present utility model, the safe and reliable operation of the gas-liquid separation system is realized, and the backflow of the lye in the gas-liquid separator 9 to the scrubber through the overflow pipeline is prevented. In particular, when the system load fluctuates greatly, the occurrence of the backflow of the lye can be prevented.

[0041] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the field to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such here.

[0042] As used in this application, the meaning of "and / or" includes both the case where each exists separately and the case where both exist simultaneously.

[0043] As used in this application, the meaning of "connection" can be a direct connection between components or an indirect connection between components through other components.

[0044] Taking the above-mentioned ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gas-liquid separation system for electrolytic hydrogen production to prevent alkali solution backflow, comprising a scrubber and a gas-liquid separator, wherein the scrubber is provided with a gas outlet at the top, a gas inlet and a liquid overflow port at the side wall, a water replenishment port near the top, and a sewage outlet at the bottom; characterized in that: The liquid overflow port of the scrubber is connected to the water inlet of the gas-liquid separator through an overflow pipe. The height of the liquid overflow port of the scrubber is higher than the height of the water inlet of the gas-liquid separator. The overflow pipe is configured as a U-shaped curved pipe. There is alkali liquid in the U-shaped curved pipe to form a liquid sealing device.

2. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1 is characterized in that: The air inlet of the scrubber is connected to the air outlet of the gas-liquid separator through a pipeline. After the pipeline in the air inlet of the scrubber is inserted into the scrubber, it extends below the liquid level in the scrubber.

3. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1 is characterized in that: The height of the air inlet of the scrubber is higher than the liquid overflow port of the scrubber.

4. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1 is characterized in that: The scrubber is a vertical scrubber or a horizontal scrubber, and the gas-liquid separator is a vertical gas-liquid separator or a horizontal gas-liquid separator.

5. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1 is characterized in that: The U-shaped turning part of the U-shaped bending pipe is located inside or outside the gas-liquid separator.

6. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1, characterized in that: The bottom height of the U-shaped bend of the U-shaped bend pipeline is close to the bottom height of the gas-liquid separator, and the top height of the U-shaped bend is close to the top height of the gas-liquid separator.

7. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1, characterized in that: The raw water inlet at the top of the scrubber is connected to a water replenishing device, and a filter is arranged between the water replenishing device and the water replenishing port.

8. The gas-liquid separation system for electrolytic hydrogen production for preventing alkali solution backflow according to claim 1, characterized in that: The scrubber is a hydrogen scrubber or an oxygen scrubber, and the gas-liquid separator is a hydrogen gas-liquid separator or an oxygen liquid separator; When the scrubber is a hydrogen scrubber, a hydrogen-liquid separator is connected thereto; When the scrubber is an oxygen scrubber, an oxygen-liquid separator is connected thereto.

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