Water electrolysis oxygen generation system
By combining PEM water electrolysis and high-temperature proton membrane fuel cell technology, hydrogen impurities are directly processed, eliminating the need for dehydration devices. This results in a highly efficient and low-energy-consumption water electrolysis oxygen production system, suitable for outdoor operations and improving the living environment.
Patent Information
- Application Number
- CN202423153061.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The reason why high-purity hydrogen cannot be directly used as fuel cell stack in existing water electrolysis oxygen production systems is that the requirements of fuel cells necessitate the addition of condensation or adsorption hydrogen dehydration devices, which increases system volume, energy consumption, and hydrogen consumption.
By combining PEM water electrolysis and high-temperature proton exchange membrane fuel cell technology, the high inclusiveness of high-temperature proton exchange membrane fuel cells is used to directly treat hydrogen impurities, eliminating the need for complex dehydration devices, and the working state is optimized through an intelligent control system to achieve efficient oxygen production.
It achieves a highly efficient and low-energy oxygen production process, simplifies the system structure, reduces overall energy consumption and volume, and has high reliability and flexibility, making it suitable for outdoor operations and improving the living environment.
Smart Images
Figure CN223620495U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an oxygen generation system, specifically an electrolytic water oxygen generation system. Background Technology
[0002] Electrolysis of water for hydrogen and oxygen production is a clean technology and an environmentally friendly and efficient method for producing high-purity hydrogen and oxygen. Currently, the technical characteristics of water electrolysis oxygen production systems are: the use of PEM (Polymerized Electrolysis) technology with pure, non-corrosive water as the working medium; direct pressurized hydrogen production with atmospheric pressure water supply (using a high differential pressure electrolyzer and system); high current density, miniaturized fuel cell stack for easy integration; rapid system response to adapt to dynamic operation; high gas purity (high-purity hydrogen can directly meet the requirements of fuel cells); high efficiency, low energy consumption, and long lifespan; high reliability and safety; miniaturization and integration for easy operation and maintenance.
[0003] PEM (Polyethylene Hydrogen Extraction) water electrolysis technology uses direct current to decompose ultrapure water into high-purity oxygen and hydrogen. However, the produced high-purity hydrogen, while possessing a purity of up to 99.97% (H2O ≤ 0.03%), has very stringent requirements for hydrogen sources according to GB / T37244-2018 "Proton Exchange Membrane Fuel Cell Vehicle Fuel Hydrogen". These requirements, such as H2O ≤ 5 ppm, are significantly lower than the water content in the produced hydrogen. Therefore, the produced high-purity hydrogen cannot be used directly as fuel and requires a complex condensation or adsorption-type hydrogen dehydration device before it can be used in traditional low-temperature proton exchange membrane fuel cells. When matched with an LT-PEMFC (traditional hydrogen fuel cell) stack system, including a high-precision humidifier and radiator, this further increases the overall system size, energy consumption, and hydrogen consumption. Summary of the Invention
[0004] The purpose of this invention is to provide an electrolytic water oxygen production system that achieves efficient, green, and convenient oxygen production by coupling PEM water electrolysis and high-temperature proton membrane fuel cell (HT-PEMFC) technology, effectively solving the problems of outdoor work, mobile camping, and improving the living environment of residents in plateau areas.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] An electrolytic water oxygen production system, characterized in that it comprises a PEM electrolytic water oxygen and hydrogen production device and a high-temperature proton exchange membrane fuel cell device; the inlet of the PEM electrolytic water oxygen and hydrogen production device is connected to ultrapure water, and the oxygen outlet of the PEM electrolytic water oxygen and hydrogen production device is connected to an oxygen storage tank; the hydrogen outlet of the PEM electrolytic water oxygen and hydrogen production device is connected to the hydrogen inlet of the high-temperature proton exchange membrane fuel cell device; the DC power input device of the PEM electrolytic water oxygen and hydrogen production device is connected to the DC power output device of the high-temperature proton exchange membrane fuel cell device through a power controller; and the high-temperature proton exchange membrane fuel cell device is connected to an air compressor.
[0007] Furthermore, in the high-temperature proton exchange membrane fuel cell device, the HT-PEMFC stack, hydrogen heat exchanger, and air heat exchanger are integrated into a single structure. The HT-PEMFC stack is connected to a temperature controller and a fan.
[0008] In this invention, the main power supply is a 220V AC input power controller; the high-temperature proton membrane fuel cell device outputs a DC voltage of 23-39V and an output current of 0-18A, which is used as feedback energy input to the power controller; the power controller replenishes the power output terminal with the feedback energy, and rectifies and regulates it to a DC voltage of 48V to provide power to the PEM water electrolysis oxygen and hydrogen production device, ensuring that hydrogen and oxygen production are controlled in a constant current manner.
[0009] The intelligent control system monitors and adjusts the working status of the PEM water electrolysis oxygen and hydrogen production device in real time. The intelligent control system includes sensors, controllers, and actuators. The sensors are responsible for collecting water level, temperature, and pressure data in real time. The controller analyzes and processes the data according to a preset algorithm and issues corresponding control commands. The actuators adjust the electrolysis current and flow rate according to the controller's commands to achieve the best oxygen production efficiency.
[0010] The intelligent control system has a fault self-diagnosis function. Once an anomaly is detected, it will issue an alarm in a timely manner and take measures to ensure the safe and stable operation of the system. The intelligent control system has scalability and flexibility, and can be modularly configured and upgraded according to actual needs. The intelligent control system automatically adjusts its working state according to changes in external environmental conditions through optimization algorithms to achieve the best energy efficiency ratio.
[0011] The beneficial effects of this utility model are as follows:
[0012] High-temperature proton exchange membrane fuel cell (PEMFC) devices exhibit exceptional tolerance for hydrogen fuel impurities, with a tolerance of H2O ≤10%, far exceeding the water content requirements of hydrogen produced through PEM water electrolysis. Therefore, the high-purity hydrogen generated from water electrolysis can be directly used as fuel, injected into the HT-PEMFC stack system to achieve a highly efficient hydrogen-to-electricity conversion reaction. This eliminates the need for complex hydrogen dehydration equipment and simplifies hydrothermal management, eliminating the need for humidifiers and high-precision radiators, thus reducing overall system efficiency. This invention perfectly achieves low-energy-consumption water electrolysis for oxygen production. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0014] like Figure 1 As shown, an electrolytic water oxygen production system includes a PEM electrolytic water oxygen and hydrogen production device 1 and a high-temperature proton exchange membrane fuel cell device 2. The inlet of the PEM electrolytic water oxygen and hydrogen production device is connected to ultrapure water 11, and the oxygen outlet of the PEM electrolytic water oxygen and hydrogen production device is connected to an oxygen storage tank 12. The hydrogen outlet of the PEM electrolytic water oxygen and hydrogen production device is connected to the hydrogen inlet of the high-temperature proton exchange membrane fuel cell device. The DC power input device of the PEM electrolytic water oxygen and hydrogen production device is connected to the DC power output device of the high-temperature proton exchange membrane fuel cell device through a power controller 3. The high-temperature proton exchange membrane fuel cell device 2 is connected to an air compressor 4.
[0015] In the high-temperature proton exchange membrane fuel cell device 2, the HT-PEMFC stack 21 is integrated with the hydrogen heat exchanger and the air heat exchanger. The HT-PEMFC stack 21 is connected to the temperature controller 22 and the fan 23.
[0016] In this invention, direct current is used to decompose pure water into high-purity oxygen and hydrogen. The chemical reaction is as follows:
[0017] Cathode: 2H₂O + 2e⁻ → H₂ + 2OH⁻ -
[0018] Anode: 2OH - -2e→H2O+1 / 2O2
[0019] Overall reaction: H₂O = H₂ + 1 / 2O₂
[0020] This system adopts internationally advanced PEM water electrolysis device preparation and system integration technology.
[0021] In this invention, the high-temperature proton exchange membrane fuel cell device has low requirements for hydrogen purity (70% or more H2 and 1-2% CO are sufficient). The stack system employs a high-performance liquid-cooling design, integrating the HT-PEMFC stack with the hydrogen heat exchanger and air heat exchanger to achieve a smaller system size and weight, higher reliability, and superior performance.
[0022] The high-value-added pure oxygen produced by the PEM (Proton Exchange Membrane) water electrolysis oxygen and hydrogen production device is stored in a dedicated oxygen storage device for public use. High-purity hydrogen can be used as a hydrogen source fuel, directly coupled with high-temperature proton exchange membrane fuel cell devices. Through an electrochemical reaction with oxygen in the air (as an oxidant), the chemical energy of the fuel is efficiently converted into a continuous supply of electrical energy (direct current). The only waste product of the fuel cell is pure water, which is used as a coolant in the fuel cell system. Excess water is returned to the pure water tank to continue as a feedstock for oxygen production. The chemical reaction is as follows:
[0023] Anode: 2H₂ + 2O₂ → 2H₂O + 4e
[0024] Cathode: O2 + 4e → 2O2-
[0025] Overall reaction: 2H₂ + O₂ → 2H₂O
[0026] By using a feedback electrolysis water power source, electrical energy can be converted locally, reducing overall energy efficiency. It can be used in a timely manner through energy feeding, or matched with battery energy storage, or connected to a load for use.
[0027] A control method for an electrolytic water oxygen production system, comprising the following specific steps:
[0028] 1) Ultrapure water 11 is fed into the PEM electrolysis water oxygen and hydrogen production device 1. The power controller 3 provides power to the PEM electrolysis water oxygen and hydrogen production device. The oxygen generated by PEM electrolysis water is sent into the oxygen storage tank 12. The generated hydrogen directly enters the high-temperature proton membrane fuel cell device 2.
[0029] 2) The air compressor 4 sends oxygen-containing air into the high-temperature proton membrane fuel cell device 2, where it undergoes an electrochemical reaction with hydrogen to generate DC power that is fed back to the power controller 3.
[0030] 3) The supplemented electrical energy is output to the PEM electrolysis water oxygen and hydrogen production device 2 through the power controller to produce hydrogen and oxygen.
[0031] In this invention, the main power supply is a 220V AC input power controller; the high-temperature proton membrane fuel cell device outputs a DC voltage of 23-39V and an output current of 0-18A, which is used as feedback energy input to the power controller; the power controller replenishes the power output terminal with the feedback energy, and rectifies and regulates it to a DC voltage of 48V to provide power to the PEM water electrolysis oxygen and hydrogen production device, ensuring that hydrogen and oxygen production are controlled in a constant current manner.
[0032] The intelligent control system monitors and adjusts the working status of the PEM water electrolysis oxygen and hydrogen production device in real time. The intelligent control system includes sensors, controllers, and actuators. The sensors are responsible for collecting water level, temperature, and pressure data in real time. The controller analyzes and processes the data according to a preset algorithm and issues corresponding control commands. The actuators adjust the electrolysis current and flow rate according to the controller's commands to achieve the best oxygen production efficiency.
[0033] The intelligent control system has a fault self-diagnosis function. Once an anomaly is detected, it will issue an alarm in a timely manner and take measures to ensure the safe and stable operation of the system. The intelligent control system has scalability and flexibility, and can be modularly configured and upgraded according to actual needs. The intelligent control system automatically adjusts its working state according to changes in external environmental conditions through optimization algorithms to achieve the best energy efficiency ratio.
[0034] In terms of safety, the system employs multiple protection measures, including overvoltage protection, overcurrent protection, and overheat protection, ensuring rapid power cutoff under any abnormal circumstances to prevent equipment damage or personal injury. Furthermore, the system features remote monitoring and fault alarm functions, allowing maintenance personnel to view the system's operating status in real time via a remote terminal and promptly respond to and handle various abnormal situations.
[0035] This invention is not only highly efficient, stable, and safe, but also highly scalable and flexible, and can be widely used in medical, chemical, and environmental protection fields to provide reliable oxygen supply and energy solutions for related industries.
Claims
1. An electrolysis water oxygen production system, characterized in that: The device includes a PEM electrolysis water oxygen and hydrogen production unit (1) and a high-temperature proton membrane fuel cell device (2). The inlet of the PEM electrolysis water oxygen and hydrogen production unit (1) is connected to ultrapure water (11), and the oxygen outlet of the PEM electrolysis water oxygen and hydrogen production unit (1) is connected to an oxygen storage tank (12). The hydrogen outlet of the PEM electrolysis water oxygen and hydrogen production unit (1) is connected to the hydrogen inlet of the high-temperature proton membrane fuel cell device (2). The DC power input device of the PEM electrolysis water oxygen and hydrogen production unit (1) is connected to the DC power output device of the high-temperature proton membrane fuel cell device (2) through a power controller (3). The high-temperature proton membrane fuel cell device (2) is connected to an air compressor (4).
2. The water electrolysis oxygen production system according to claim 1, characterized in that: In the high-temperature proton membrane fuel cell device (2), the HT-PEMFC stack (21) is an integrated structure with the hydrogen heat exchanger and the air heat exchanger.
3. The water electrolysis oxygen generation system according to claim 2, characterized in that: The HT-PEMFC stack (21) is connected to a temperature controller (22) and a fan (23).