The main function of the laboratory ventilation system is to ensure the air quality in the laboratory, prevent toxic gases, vapors and particles from spreading into the indoor space, and ensure the health of experimental personnel and the normal operation of laboratory equipment.
The following are the main functions of laboratory ventilation systems:
- Exclude harmful substances: Use exhaust hoods and other equipment to quickly extract toxic gases, vapors and particles generated in the laboratory to prevent them from accumulating in the laboratory.
- Ensure experimenter safety: Protect the health and safety of experimenters by preventing them from being exposed to harmful gases and vapors. Exhaust hoods and other ventilation equipment can provide a relatively closed working environment and reduce the impact of harmful substances on experimenters.
- Maintain air quality: Ensure air quality within the laboratory meets acceptable standards by providing fresh air and removing harmful substances. This helps prevent harmful substances in the air from reaching dangerous levels and maintains a positive working environment.
- Control temperature and humidity: Ventilation systems can help regulate temperature and humidity in the laboratory to ensure a comfortable working environment under various experimental conditions.
- Fire Safety: Laboratory ventilation systems also help prevent fires. By eliminating harmful gases in a timely manner, the concentration of flammable gases is reduced and the risk of fire and explosion is reduced.
- Prevent cross-contamination: Ventilation systems help prevent cross-contamination between different areas within the laboratory. The negative pressure design can ensure that the air flows from relatively clean areas to relatively polluted areas, reducing the possibility of contamination spreading.
- Equipment protection: Ventilation systems help protect laboratory equipment and prevent corrosion and damage to equipment from harmful substances.
Compliance with regulations: The design and operation of laboratory ventilation systems need to comply with relevant regulations and standards to ensure compliance and safety of laboratory operations.
What equipment is needed for a ventilation system in a chemical laboratory?
- Fume hood: Fume hood is one of the core equipment of laboratory ventilation system. It is a closed work space that uses an exhaust fan to extract air from the work area to prevent harmful gases and vapors from spreading into the laboratory. Fume hoods are usually equipped with a transparent front door to facilitate laboratory personnel to observe and conduct experiments.
- Suction hood: Suction hood is used to control and collect harmful gases and vapors generated in the laboratory. Unlike exhaust hoods, suction hoods are usually local ventilation devices installed on experimental benches or specific experimental equipment.
- Ventilation Fans: Ventilation systems typically include fans that create airflow and push air through an exhaust hood or other ventilation device. The fan can be an axial fan or a centrifugal fan, and its size and capacity should be based on the size and needs of the laboratory.
- Duct System: Duct system is the network of channels that carry exhaust air from the hood to the outdoors. The air duct should be sufficiently sealed to ensure that hazardous materials do not leak into the laboratory or other areas. Laboratory ventilation ducts are usually made of anti-corrosion materials, such as PP ducts and stainless steel ducts.
- Wet scrubber: Wet scrubber is used to filter and adsorb harmful exhaust gases emitted.
- Air volume control device: The air volume control device is used to adjust the air volume of the ventilation system to ensure that the system can meet the needs of experimental conditions. This can be manually or automatically controlled. Common air volume control devices include VAV dampers, CAV dampers, and check valves.
- Air quality monitoring system: The monitoring system is used to monitor indoor air quality in real time and detect the concentration of harmful gases. Monitoring systems can trigger alarms or automatically adjust ventilation systems once concentrations above safe levels are detected.
- Wind pressure sensing system: In order to prevent gas leakage, laboratories generally adopt negative pressure designs. The wind pressure sensor can monitor indoor air pressure changes in real time and realize automatic control of exhaust air volume.
Emergency Stop Button: Provides manual control for quickly shutting down the ventilation system in an emergency.