The Use of Fume Hoods in Chemical Enterprises in Large-scale Production Experiments?

The use of fume hoods in large-scale production experiments in chemical enterprises should focus on the following aspects:

First, operation norms and safety protection

Control of the experimental environment

Before the experiment, it is necessary to confirm the operating status of the fume hood, including the normal operation of the fan, air velocity and lighting system, to ensure that the face velocity is maintained within the range of 0.35-0.75m/s and prevent the escape of pollutants.

During the experiment, the operator should keep a distance of more than 15cm from the regulating door of the fume hood. It is strictly forbidden to put their head or hands into the hood to prevent inhalation of harmful gases.

Placement of equipment and items

Experimental equipment should be placed deep inside the fume hood, at least 15cm away from the inner side of the regulating door, to avoid interfering with the airflow. When the height of the equipment exceeds 10cm, a bracket should be used to raise it to ensure the unobstructed air flow channel below.

The total area of the equipment inside the fume hood must not exceed 50% of the countertop area to avoid excessive stacking that may cause air flow disorder.

Management of Dangerous goods

For experiments involving flammable and explosive organic reagents, power sockets should not be installed in fume hoods to prevent fire or explosion accidents.

Flammable, explosive or toxic and harmful substances are strictly prohibited from being stored in the fume hood. Residual reagents and instruments should be cleared in a timely manner after the experiment.

Second, optimization of operation processes and efficiency

Window height adjustment

During the experiment, the window should be kept at a height of 10 to 15cm from the tabletop to ensure that the area above the operator's chest is protected by the glass.

When no operation is needed, the window should be lowered to the lowest position to reduce energy consumption and prevent the leakage of contaminants.

Maintenance of airflow stability

During the experiment, it is necessary to avoid opening doors and Windows or using fans near the fume hood to reduce cross-flow interference. Operators should avoid rapid movement or swinging of their arms to prevent disturbing the airflow.

For long-term experiments, it is necessary to regularly check the operating status of the fume hood to ensure the continuous and effective exhaust effect.

Emergency response preparedness

Before the experiment, it is necessary to be familiar with the emergency shut-off procedures of the fume hood to ensure that the power supply can be quickly cut off and the window closed in case of chemical leakage or fire.

Emergency flushing devices and fire extinguishing equipment should be provided in fume hoods, and operators need to receive regular emergency handling training.

Third, equipment maintenance and upkeep

Daily cleaning

After each experiment, the internal countertop and Windows of the fume hood should be wiped with clean water to promptly remove any reagent residues. For stubborn stains, a mild cleaner (such as acetone) can be used for wiping. Avoid using abrasive or bleach-containing cleaners.

Regularly clean the deflector plates and exhaust vents of the fume hood to prevent dust or reagent crystals from blocking the air flow channels.

Regular inspection

Check the operation status of the fan, motor and damper of the fume hood every quarter to ensure that the exhaust air volume meets the design requirements.

Conduct a comprehensive inspection of fume hoods every year, including indicators such as face velocity, leakage rate, and noise, to ensure that the equipment performance meets the standards.

Accessory maintenance

Regularly apply oil to metal parts such as door hinges and handles to prevent rust or jamming. Avoid direct contact of corrosive reagents with the accessories. If contact occurs accidentally, rinse immediately with clean water and dry.

Check the integrity of the power cord, socket and grounding device to prevent the risk of leakage or short circuit.

Professional maintenance

For complex faults or performance degradation issues, it is necessary to contact professional maintenance personnel for inspection and repair to avoid equipment damage or safety hazards caused by self-disassembly.

The filter of the fume hood needs to be replaced regularly according to the frequency of use and the type of pollutants to ensure the exhaust effect.