Laboratory hydrogen generators have gradually replaced traditional high-pressure hydrogen gas cylinders and become an ideal gas source for analytical instruments such as gas chromatography and ICP-MS due to their immediate production, safety, and convenience characteristics. However, hydrogen has hazardous characteristics such as flammability, explosiveness, low density, and high diffusion coefficient, and its safety cannot be ignored. The correct selection of installation location and strict adherence to safety regulations are the primary prerequisites for ensuring the safety of laboratory personnel and equipment.
1、 Core principle: Scientific selection of installation location
The choice of installation location directly determines the safety baseline of the hydrogen generator. The following core principles should be followed:
1. Good ventilation and air circulation
Location: An independent and well ventilated dedicated gas cylinder room or laboratory corner is an ideal choice. It is necessary to ensure that the room has a continuous and effective mechanical ventilation system (such as exhaust fans), and the ventilation openings should be located at the upper part of the room, because hydrogen gas density is much lower than air, and once leaked, it will accumulate upwards.
Prohibited location: It is absolutely prohibited to install in enclosed and unventilated spaces, such as small storage rooms and cabinets. This can lead to the accumulation of leaked hydrogen gas, creating an explosive environment.
2. Keep away from sources of ignition and potential ignition sources
Safe distance: The generator should maintain a safe distance of at least 3-5 meters from any open flame (such as alcohol lamps, gas stoves).
Electrical equipment: The installation location should be away from equipment that may generate electrical sparks, such as switches, sockets, relays, non explosion proof motors, etc. Electrical appliances in the surrounding environment of the generator should be explosion-proof as much as possible.
3. Stable environmental conditions
Avoid temperature: It should be installed in a cool, dry place, away from direct sunlight, and kept away from high temperature heat sources such as ovens and muffles. The recommended ambient temperature is usually between 5-40 ℃ to ensure electrolysis efficiency and equipment lifespan.
Stability and cleanliness: The generator should be placed on a horizontal and stable experimental platform or dedicated support to avoid vibration. The surrounding environment should be kept clean and free of corrosive chemical vapors to prevent corrosion to equipment circuits and gas circuits.
4. Convenience of operation and maintenance
The installation location should reserve sufficient space for daily operation, observation of liquid level, replacement of silicone desiccant, and regular maintenance, while ensuring that the connecting pipelines with gas equipment are as short and smooth as possible.
2、 Lifeline: Safety Operation Standards
On the basis of correct installation, strict operating procedures are another line of defense to ensure safety.
1. Inspection and preparation before use
Reagents and consumables: High purity deionized water or ultrapure water required by the generator must be used. It is strictly prohibited to use tap water or ordinary distilled water to prevent scaling and contamination of the catalyst. Regularly inspect and replace desiccants.
Airtightness inspection: When using or restarting after a long period of disuse, the entire air circuit system should undergo strict leak detection to ensure that all interfaces are well sealed.
2. Monitoring and management during operation
Dedicated person in charge: It is recommended to designate a dedicated person to manage and provide professional training.
Do not move: It is strictly prohibited to move or strike the device during operation.
Abnormal situation handling: If abnormal pressure fluctuations, abnormal noise, alarms, or irritating odors (usually electrolyte leaks) are detected, the machine should be immediately shut down and professional personnel should be contacted for maintenance. Do not disassemble the device without authorization during operation.
3. Shutdown and long-term storage
When shutting down, follow the procedure of first reducing the load and then turning off the power.
If not used for a long time, the electrolyte in the storage tank should be emptied and rinsed clean with water to keep the inside of the generator dry and prevent corrosion.
3、 Final Line of Defense: Emergency Preparedness and Personal Protection
1. Equipped with dedicated safety facilities
A hydrogen leak alarm should be prominently installed near the generator installation area to detect potential hazards in a timely manner.
At the same time, corresponding types of fire extinguishers (such as carbon dioxide or dry powder fire extinguishers) should be equipped.
2. Personal protection
Operators and maintenance personnel should wear safety goggles and gloves to prevent accidental contact with electrolytes (usually strong alkaline KOH or NaOH solutions) from causing chemical burns.
3. Clear emergency plan
The laboratory should develop emergency plans for hydrogen leaks and fires, and ensure that all relevant personnel are familiar with them. Once a large amount of leakage occurs, the power supply should be immediately cut off, personnel should be evacuated, and the site should be naturally ventilated. It is strictly prohibited to turn on any electrical switches.