Driven by the dual-carbon goals, the photovoltaic and wind power coupled electrolysis water-splitting hydrogen production projects have rapidly achieved large-scale implementation, becoming the mainstream route for green hydrogen production. They can effectively absorb the surplus power of new energy and help the industrial sector achieve green transformation. The electrolysis hydrogen production process has special conditions and strict standards. Gas monitoring instruments, as core supporting equipment, play a crucial role in production, quality control, equipment operation and maintenance, and energy conservation and cost reduction. This article briefly analyzes the current industry situation, the core value of monitoring, and the overall instrument selection plan for the entire process.
01 Electrolysis Water Splitting Hydrogen Production Process and Industry Status
(1) Process Principle
Electrolysis water splitting hydrogen production utilizes wind power and photovoltaic direct current electricity. Through the electrolysis cell, water molecules are decomposed to produce hydrogen and oxygen. It is a mature and clean zero-carbon hydrogen production process. The entire process can achieve the conversion and resource utilization of new energy power.
Complete process flow: Wind power station power supply → Electrolysis cell electrolysis to produce gas → Gas drying and purification → Hydrogen storage and transportation → Energy storage, transportation, industrial and other scenarios applications
After the new energy power is stabilized and sent to the electrolysis cell for gas production, the generated hydrogen and oxygen gases are dried and purified to meet standards before being stored in tanks, widely used in energy storage peak shaving, hydrogen energy transportation, industrial processing and other fields, forming a complete zero-carbon hydrogen energy chain.
(2) Industry Status and Core Challenges
Based on policies and market dividends, large-scale hydrogen production projects in regions rich in wind and solar energy have been continuously implemented, and the industry scale has rapidly expanded, effectively solving the problem of new energy consumption and promoting the green transformation of the industrial sector. However, project operations generally face two core challenges:
1. High management pressure: Hydrogen and oxygen can intermingle, forming explosive mixtures, with high process risks and extremely low production tolerance;
2. High quality and operation difficulty: The oxygen and moisture content in hydrogen directly affect the downstream usage effect. The electrolysis cell has many concealed faults and is difficult to predict, which can cause quality Exceeds the limit, high energy consumption, and equipment wear and tear problems.
2. Core Application Value of Online Gas Monitoring Instruments
Non-explosive online gas monitoring instruments can achieve high-precision monitoring throughout the hydrogen production process, covering protection, quality control, and equipment operation and maintenance scenarios, helping the project operate stably and continuously.
(1) Real-time monitoring and early warning, guarding the production bottom line
The electrolysis cell operates with hydrogen and oxygen isolated in both directions. If there is gas intermixing or concentration exceeding the limit, it is highly likely to cause an explosion accident, resulting in equipment damage and production accidents. Special monitoring instruments collect gas concentrations 7× in real time and link with the central control system to achieve multi-level early warning protection: timely warning when approaching the threshold, automatic shutdown and interlock when reaching the dangerous threshold, avoiding hydrogen and oxygen explosion risks from the source and ensuring the essence of the production line.
(2) Online quality control, ensuring high-purity hydrogen production
For downstream scenarios such as fuel cells, fine chemicals, and electronic metallurgy, high purity and dryness of hydrogen are required. Excess oxygen and moisture in hydrogen will damage precision equipment, shorten service life, and increase operation and maintenance costs. Monitoring instruments provide real-time feedback on gas composition and moisture data, allowing staff to dynamically adjust the electrolysis and drying process parameters to stabilize gas production quality and meet the high-purity hydrogen usage standards of downstream applications.
(3) Monitoring equipment operation status, early maintenance, cost reduction and efficiency improvement
Gas monitoring data can directly reflect the operation status of the electrolysis cell. An abnormal increase in the oxygen content in hydrogen can predict concealed faults such as electrolysis cell membrane leakage and damage, supporting early maintenance and preventive maintenance to avoid major equipment failures and downtime losses. At the same time, relying on real-time data, the operating parameters such as electrolysis current, pressure, and liquid level can be optimized to maintain the operating condition, reduce hydrogen production electricity consumption, and improve the overall project revenue.
3. Special Instrument Selection Scheme for Hydrogen Production Process throughout the Chain
For the three key process nodes of electrolysis gas production, oxygen storage, and hydrogen drying and purification, which meet the requirements for explosion prevention and high-precision online monitoring at hydrogen production sites, three specialized instruments can fully cover the needs of monitoring, quality inspection, and equipment status monitoring.
1. The RL-A100Ex hydrogen oxygen analyzer is used for online detection of trace oxygen in hydrogen, controlling the purity of gas production and preventing oxygen content from exceeding the limit. It is suitable for the entire process of hydrogen production by electrolysis and hydrogen purification.
2. The RL-A200Ex oxygen-hydrogen analyzer can monitor the hydrogen leakage on the oxygen side in real time, preventing the risk of hydrogen-oxygen crossover, eliminating the explosion hazard at the source, and ensuring the smooth operation of the production line.
3.The RL-A300Ex hydrogen dew point meter accurately detects trace amounts of moisture in hydrogen, monitors the effectiveness of drying and purification, solves the problem of excessive hydrogen moisture content, and ensures the quality of high-purity hydrogen production.
