Electrolytic tank outlet sampling system
By introducing an oxygen separator and scrubber into the electrolyzer outlet sampling system, combined with a level sensor and a demineralized water system, the problem of accurate detection of the electrolyzer's operating status was solved, enabling timely judgment of the electrolyzer's operating status and improving the reliability and efficiency of the hydrogen production system.
Patent Information
- Application Number
- CN202510948602.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-10-31
AI Technical Summary
Existing technology cannot accurately determine the operating status of each electrolyzer, resulting in the inability to detect abnormal operation in a timely manner, which affects the efficiency and reliability of the hydrogen production system.
An electrolytic cell outlet sampling system was designed. By leading out a sampling tube from each electrolytic cell outlet and connecting it to an oxygen separator and an oxygen analysis separation tank, gas analysis is performed using gas-liquid separation and an oxygen scrubber. Combined with a liquid level sensor and a demineralized water system, the operating status of the electrolytic cell can be detected.
It can promptly determine the operating status of the electrolyzer, reduce misjudgments, improve the reliability and efficiency of the hydrogen production system, and reduce the risk of downtime.
Smart Images
Figure CN120866883A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water electrolysis hydrogen production technology in the new energy sector, specifically to an electrolyzer outlet sampling system. Background Technology
[0002] Currently, with the large-scale application of hydrogen production, systems equipped with only one electrolyzer in a gas-liquid separation unit are far from meeting the needs of hydrogen production. To break this bottleneck, the market has seen gas-liquid separation units configured with two or four electrolyzers, with a gas purity analyzer installed at the outlet of the gas-liquid separation unit. This is a new model that meets the needs of large-scale hydrogen production, but it also brings some problems, such as the inability to determine whether each electrolyzer is operating normally or malfunctioning. Summary of the Invention
[0003] To address the aforementioned technical problems, this invention provides an electrolytic cell outlet sampling system, which facilitates the detection of the operating status of the electrolytic cell.
[0004] The technical solution is as follows: an electrolytic cell outlet sampling system, characterized in that it includes an electrolytic cell outlet pipe 1 and an electrolytic cell outlet pipe 2. The ends of the electrolytic cell outlet pipe 1 and the electrolytic cell outlet pipe 2 are connected to one end of an oxygen separator and are respectively provided with sampling pipes connected to an oxygen analysis separation tank. The oxygen analysis separation tank is provided with a baffle plate. The top of the oxygen analysis separation tank is provided with two gas outlet pipes connected to an oxygen-hydrogen analyzer. A bypass pipe is provided on the gas outlet pipes to connect to an oxygen scrubber. The other end of the oxygen separator is provided with an alkaline solution outlet pipe at the lower part and an oxygen cooler at the upper part. The top gas pipe of the oxygen cooler is connected to the oxygen scrubber. The top of the oxygen scrubber is the oxygen outlet.
[0005] A further feature is that the oxygen separator is provided with demineralized water, and the outlet of the sampling tube is located below the liquid level of the demineralized water. The bottom of the oxygen analysis and separation tank is provided with a return pipe connected to the oxygen separator; A nitrogen purging pipe is installed on the return pipe; The oxygen analysis and separation tank is equipped with a liquid level sensor and is connected to a demineralized water supply pipe. The oxygen scrubber is equipped with cooling water, and a cooling water coil is installed above the cooling water. The outlet of the bypass pipe and the outlet of the top pipe are both located below the liquid level of the cooling water.
[0006] With this invention, a sampling tube is drawn from the outlet pipe of each electrolytic cell and sent to the oxygen analysis and separation tank via a bypass method. The outlet of the electrolytic cell outlet pipe is connected to the oxygen separator. The alkaline solution and gas are separated through gas-liquid separation. The gas is led to the oxygen scrubber through the top gas pipe. The oxygen from the oxygen analysis and separation tank enters the oxygen-hydrogen analyzer for analysis, thus completing the purpose of detecting the operating status of the electrolytic cell. Excess gas is also sent to the oxygen scrubber, and finally the oxygen is discharged. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation
[0008] See Figure 1 As shown, an electrolytic cell outlet sampling system includes an electrolytic cell outlet pipe 1 and an electrolytic cell outlet pipe 2. The ends of the electrolytic cell outlet pipe 1 and the electrolytic cell outlet pipe 2 are connected to one end of an oxygen separator 3 and are respectively provided with sampling pipes 4 connected to an oxygen analysis separation tank 5. The oxygen analysis separation tank 5 is provided with a baffle 17, and the two sampling pipes 4 are located on both sides of the baffle 17. The oxygen separator 3 is provided with demineralized water, and the outlet of the sampling pipe 4 is located below the liquid surface of the demineralized water to wash the alkaline solution carried in the gas. The top of the oxygen analysis separation tank 5 is provided with two outlet pipes 7 connected to an oxygen-hydrogen analyzer 6. A bypass pipe 8 is provided on the outlet pipe 7 to connect to an oxygen scrubber 9. The other end of the oxygen separator 3 is provided with an alkaline solution outlet pipe 10 at the lower part and an oxygen cooler 11 at the upper part. The top gas pipe 12 of the oxygen cooler 11 is connected to the oxygen scrubber 9, and the top of the oxygen scrubber 9 is an oxygen outlet 13. The oxygen scrubber 9 is equipped with cooling water, and a cooling water coil 14 is installed above the cooling water to provide dual cooling. The outlet of the bypass pipe 8 and the outlet of the top gas pipe 12 are both located below the liquid level of the cooling water to prevent gas mixing and avoid affecting the accuracy of the analysis. The oxygen scrubber 9 is also equipped with an overflow pipe 21 connected to the oxygen separator 3 and a water supply pipe 22 connected to the water pump.
[0009] The bottom of the oxygen analysis separation tank 5 is equipped with a return pipe 15 connected to the oxygen separator 3. The liquid level in the oxygen analysis separation tank 5 is kept at a certain height from the top of the oxygen separator 3. The alkaline solution is discharged into the oxygen separator 3 by using the water level difference. In order to ensure the accuracy of the analysis, a nitrogen purging pipe 16 is connected to the return pipe 15 to purge the oxygen analysis separation tank 5 from the bottom.
[0010] The oxygen analysis and separation tank 5 is equipped with a level sensor 18 and is connected to a demineralized water supply pipe 19, which introduces a single line of demineralized water. During startup, half a tank of demineralized water can be added as a water seal. During shutdown, it can be used for cleaning. During operation, demineralized water is added periodically for both cooling and washing, effectively cleaning the alkaline solution in the oxygen while saving on the need for a cooler. In this invention, all pipelines are equipped with pneumatic shut-off valves for easy intelligent control, and the liquid level sensor 18 can monitor the liquid level in real time to ensure that the water seal does not fail.
[0011] The bottom of the oxygen separator 3 is also equipped with a nitrogen purge pipe 20.
[0012] Although this solution increases investment, it allows for preliminary assessment of electrolytic cell problems during operation. Combined with data from other sources, it enables accurate determination of whether the electrolytic cell is operating normally or to take appropriate shutdown measures, thus avoiding time delays caused by relying solely on the analyzer at the gas-liquid separation unit outlet to determine the condition of the electrolytic cell.
Claims
1. A sampling system for the outlet of an electrolytic cell, characterized in that, It includes an electrolytic cell outlet pipe 1 and an electrolytic cell outlet pipe 2. The ends of the electrolytic cell outlet pipe 1 and the electrolytic cell outlet pipe 2 are connected to one end of an oxygen separator and are respectively provided with sampling pipes connected to an oxygen analysis separation tank. The oxygen analysis separation tank is provided with a baffle plate. The top of the oxygen analysis separation tank is provided with two gas outlet pipes connected to an oxygen-hydrogen analyzer. A bypass pipe is provided on the gas outlet pipe and connected to an oxygen scrubber. The other end of the oxygen separator is provided with an alkaline solution outlet pipe at the lower part and an oxygen cooler at the upper part. The top gas pipe of the oxygen cooler is connected to the oxygen scrubber. The top of the oxygen scrubber is the oxygen outlet.
2. The electrolytic cell outlet sampling system according to claim 1, characterized in that, The oxygen separator is equipped with demineralized water, and the outlet of the sampling tube is located below the liquid level of the demineralized water.
3. The electrolytic cell outlet sampling system according to claim 1, characterized in that, The bottom of the oxygen analysis and separation tank is equipped with a return pipe that connects to the oxygen separator.
4. The electrolytic cell outlet sampling system according to claim 3, characterized in that, A nitrogen purging pipe is installed on the return pipe.
5. The electrolytic cell outlet sampling system according to claim 1, characterized in that, The oxygen analysis and separation tank is equipped with a liquid level sensor and is connected to a demineralized water supply pipe.
6. The electrolytic cell outlet sampling system according to claim 1, characterized in that, The oxygen scrubber is equipped with cooling water, and a cooling water coil is installed above the cooling water. The outlet of the bypass pipe and the outlet of the top pipe are both located below the liquid level of the cooling water.