Laboratory Ventilation and Exhaust System Design Standard

laboratory ventilation system design standard is different from the ventilation requirements of comfort air conditioning system. The main purpose is to provide a safe and comfortable working environment and reduce the possibility of personnel being exposed to dangerous air. The laboratory exhaust system mainly solves the problems of the working environment, the health and labor protection of the experimenters.

Essentials of Laboratory Ventilation System Design:

1. The system is divided scientifically and reasonably, and try to be "short, flat, smooth and straight"; the universal hood, atomic absorption hood and exhaust louvers adopt independent exhaust systems; the gas cylinders adopt independent exhaust systems; organic And inorganic experiments adopt independent exhaust system.

2. The laboratory ventilation design parameters are set reasonably. Both the main and auxiliary laboratories guarantee a safe air change frequency of 6-12 or more. The static pressure sensor variable frequency exhaust system is used to ensure a surface wind speed of about 0.5m/s under different operating conditions to ensure that harmful gases do not overflow.

3. The fresh air is supplemented by the fresh air unit to ensure that the fresh air is fresh and clean and comfortable temperature air, and to maintain the dynamic balance of indoor micro-negative pressure.

4. The exhaust air is linked with the supplementary air, and the small negative pressure difference in the room is maintained by automatically adjusting the fresh air volume and the indoor exhaust air volume to ensure the appropriate number of air changes, so that the air flow from the office to the corridor, to the laboratory, and then to Heaven.

5. Energy-saving measures: parameter setting, equipment selection is reasonable; using high-quality PP flame-retardant materials; using residual air cooling tracking technology to accurately make up the air; using static pressure sensor frequency conversion fan.

Fume hood VAV variable air volume control system:

1. Use displacement detection plus upper wind speed detection dual sensor method to control the wind speed of the fume hood. Firstly, the displacement sensor detects the change of the opening degree of the fume hood regulating door, controls the exhaust air volume of the fume hood, and keeps the wind speed of the fume hood at the set value. When the position of the adjusting door remains unchanged, the face wind speed sensor measures the face wind speed of the fume hood for precise fine-tuning.

2. After the fume hood door is closed, the air volume valve should maintain a relatively small exhaust volume of the fume hood to meet actual requirements.

3. The LCD monitor displays the actual wind speed value of the fume hood in real time.

4. Sound and light alarm when face wind speed exceeds the set range or equipment failure.

5. There will be an audible alarm when the door position of the fume hood is too high, and a holy light alarm when the wind speed of the faulty surface is too high or too low.

\6. When an abnormal situation occurs, turning on the emergency exhaust mode control system will open all the air valves, and the relatively large air volume that may be discharged in the exhaust system is not controlled by the surface wind value.

Room residual air volume control system:

Real-time calculation of the total amount of constant exhaust air volume of all variable air volume fume hoods and exhaust hoods in the analysis room, adjust the room's supplementary fresh air volume, and make the difference between the exhaust air volume and the supplementary fresh air volume constant (keep the analysis room leaked from outside the analysis room) The air volume in the room is constant).

Laboratory waste gas automatic circulation treatment system (used for the treatment of inorganic waste gas): The treatment liquid is configured with a better formula according to the type, concentration, gas volume and environmental protection requirements of the waste gas, which can purify many different types of acid waste gas, alkaline waste gas or Solvent.

Laboratory organic waste gas pressure adsorption processor (activated carbon adsorption box-used for the treatment of organic waste gas): using the characteristics of activated carbon adsorption, the organic solvent and organic waste gas in the waste gas are absorbed into the activated carbon and concentrated, so that they are separated from the gas mixture to achieve Purification purpose. The adsorption process is reversible and easy to desorb and regenerate.

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