CN-122013255-A - Method for reducing hydrogen content in oxygen of AEM electrolytic water system in emergency stop state and stop auxiliary system

Abstract

The invention relates to a method for reducing hydrogen content in oxygen of an AEM electrolytic water system in an emergency stop state and a stop auxiliary system, and belongs to the technical field of electrolytic or electrophoresis processes. The method comprises the following steps of S1, when an AEM electrolytic water system is in emergency stop, reducing the temperature of alkali liquor in the AEM electrolytic tank to room temperature through a stop auxiliary system, S2, when the AEM electrolytic water system is restarted, starting an electric control system in the AEM electrolytic water system, then starting the AEM electrolytic tank, then starting an anode tail gas system and a cathode tail gas system, then starting an anode liquid supply system to start the circulation of the alkali liquor at the anode side, and after the flow is stable, increasing the temperature of the alkali liquor at the anode side to the working temperature. The method not only can improve the emergency shutdown safety of the AEM electrolytic tank, but also is beneficial to reducing the operation and maintenance cost of the AEM electrolytic tank.

Inventors

• Dong zhun
• LI JIAHUI
• CHEN YUNZHEN
• HU RUIYANG
• YANG YUNSONG
• TANG JUNKE
• ZOU YUQUAN
• YE SIYU

Assignees

• 鸿基创能科技(广州)股份有限公司

Dates

Publication Date

20260512

Application Date

20260211

Claims (9)

1. 1. A method for reducing the hydrogen content of an AEM electrolyzed water system in an emergency stop condition, comprising the steps of: S1, when an AEM electrolytic water system is in emergency stop, reducing the temperature of alkali liquor in an AEM electrolytic tank to room temperature through a stop auxiliary system, wherein the stop auxiliary system comprises a stop auxiliary power supply, a cold liquid tank, a temperature control system, a pressure control system and a flow control system, wherein the stop auxiliary power supply is electrically connected with the temperature control system, the pressure control system and the flow control system; S2, when restarting the AEM electrolytic water system, starting an electric control system in the AEM electrolytic water system, starting the AEM electrolytic tank, starting an anode tail gas system and a cathode tail gas system, starting an anode liquid supply system to start the circulation of alkaline liquid at the anode side, and increasing the temperature of the alkaline liquid at the anode side to the working temperature after the flow is stable.
2. 2. The method of claim 1, wherein the cold liquid tank stores lye at a temperature of 25 ℃ or less.
3. 3. The method of claim 1, wherein the lye is a potassium hydroxide solution.
4. 4. A shutdown assistance system, comprising: the system comprises a shutdown auxiliary power supply, a cold liquid tank, a temperature control system, a pressure control system and a flow control system; The shutdown auxiliary power supply is electrically connected with the temperature control system, the pressure control system and the flow control system, the cold liquid tank, the temperature control system, the pressure control system and the flow control system are sequentially communicated to form an alkali liquor circulation loop, and the flow control system is communicated with an AEM electrolytic tank in the AEM electrolytic water system.
5. 5. The shutdown assistance system of claim 4, wherein the chilled liquid tank includes an evacuation unit for evacuating oxygen entrained to the chilled liquid tank as a result of the lye circulation.
6. 6. The shutdown assist system of claim 4 wherein the temperature control system comprises a temperature detection unit for detecting the temperature of the circulating lye; And the temperature cooling unit is used for reducing the temperature of the circulating alkali liquor.
7. 7. The shutdown assist system of claim 4 wherein the pressure control system comprises a pressure detection unit for detecting the pressure of the circulated lye; and the pressure regulating valve is used for reducing the pressure of the circulating alkali liquor.
8. 8. The shutdown assist system of claim 7 wherein the pressure regulating valve is a high pressure throttling valve.
9. 9. The shutdown assist system of claim 4 wherein the flow control system comprises a flow detection unit for detecting the flow of the circulated lye; and the flow regulating unit is used for regulating and controlling the flow of the circulating alkali liquor.

Description

Method for reducing hydrogen content in oxygen of AEM electrolytic water system in emergency stop state and stop auxiliary system Technical Field The invention relates to the technical field of electrolysis or electrophoresis processes, in particular to a method for reducing the hydrogen content in oxygen of an AEM electrolytic water system in an emergency stop state and a stop auxiliary system. Background Compared with the traditional alkaline electrolyzed water and Proton Exchange Membrane (PEM) electrolyzed water technology, the Anion Exchange Membrane (AEM) electrolyzed water technology not only can adopt a non-noble metal catalyst, but also has higher current density and response speed, so that the Anion Exchange Membrane (AEM) electrolyzed water technology has great potential in the aspect of adapting to wind, photoelectric and other fluctuation power sources. However, when the AEM electrolyzed water system is operated under the drive of renewable energy sources such as wind, light and electricity, severe fluctuation of input power needs to be frequently dealt with. Although power electronics control and system integration techniques can smooth out fluctuations to some extent, extreme weather, grid faults, or equipment bursting anomalies, etc., may still cause the system to need an emergency shutdown to protect the core components. In the process, the transient changes of pressure difference, temperature and ion transmission in the electrolytic cell break the original gas-liquid equilibrium state, especially the gas cross permeation phenomenon on two sides of the anion exchange membrane is aggravated, and the hydrogen concentration (hydrogen in oxygen) on the oxygen side is obviously increased. Too high oxygen in hydrogen not only reduces the gas purity and increases the cost of subsequent purification, but also is more likely to form explosive mixtures, which seriously threatens the safety of the system. At present, aiming at the problems, two technical routes are focused on firstly, the steady-state permeability of gas is reduced through membrane electrode structure optimization (such as membrane compactness enhancement, gradient pore canal supporting layer design and hydrogen-blocking functional coating introduction), and secondly, the chemical potential difference of the two sides of hydrogen and oxygen is maintained during normal operation by utilizing dynamic regulation means (such as current density active regulation and pressure balance algorithm). While these methods perform well under normal conditions, they are complex and have significantly inadequate adaptability to non-steady state processes such as emergency stops. For example, although the structural improvement of the membrane material can delay the gas crossing, the generated hydrogen-oxygen mixing cannot be blocked quickly after the system is powered off, the dynamic regulation and control depend on the active regulation of current, the power supply is interrupted instantaneously during the emergency shutdown, and the control system loses the execution capacity, so that the pressure imbalance and the gas back diffusion are unavoidable. Therefore, the prior art is difficult to effectively solve the problem of hydrogen rise in the oxygen of the electrolytic cell in the emergency stop state of the AEM electrolytic water system. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a method for reducing the hydrogen content in oxygen of an AEM electrolytic water system in an emergency stop state and a stop auxiliary system. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: in a first aspect, the present invention provides a method of reducing the hydrogen content of oxygen in an AEM electrolyzed water system in an emergency stop condition, comprising the steps of: S1, when an AEM electrolytic water system is in emergency stop, reducing the temperature of alkali liquor in an AEM electrolytic tank to room temperature through a stop auxiliary system, wherein the stop auxiliary system comprises a stop auxiliary power supply, a cold liquid tank, a temperature control system, a pressure control system and a flow control system, wherein the stop auxiliary power supply is electrically connected with the temperature control system, the pressure control system and the flow control system; S2, when restarting the AEM electrolytic water system, starting an electric control system in the AEM electrolytic water system, starting the AEM electrolytic tank, starting an anode tail gas system and a cathode tail gas system, starting an anode liquid supply system to start the circulation of alkaline liquid at the anode side, and increasing the temperature of the alkaline liquid at the anode side to the working temperature after the flow is stable. When the AEM electrolytic water system is in emergency stop, a stop auxiliary power supply in the stop auxiliary system i