Room Negative Pressure Control

Room Negative Pressure Control

The complete process of laboratory ventilation, do you understand? In the laboratory, certain harmful substances will be discharged when the research work is carried out. In order to ensure the safety of life and the purity of experimental products, a rational chemical laboratory ventilation...

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The complete process of laboratory ventilation, do you understand?

In the laboratory, certain harmful substances will be discharged when the research work is carried out. In order to ensure the safety of life and the purity of experimental products, a rational chemical laboratory ventilation system engineering design is indispensable. The device used is generally a fume hood, uses a ventilation frequency conversion system, and processes the exhaust gas. What is the complete ventilation design process?


First, the fume hood (to provide local ventilation)

1, the structure of style: up and down

The top of the cabinet is provided with a vent hole. The upper cabinet can be equipped with a fan, a deflector and a power supply. The perspective window is made of tempered glass and can be moved up and down or left and right to facilitate people's operation. The lower cabinet adopts a combination of a countertop and a cabinet, and the countertop can be used by an operator.

2, with the type: PP fume hood, all-steel fume hood, steel-wood fume hood, aluminum-wood fume hoods and so on.

3, the scope of use: bio-pharmaceuticals, biological analysis, plant cultivation, experimental experiment of volatile substances and so on.


Second, ventilation frequency conversion system

1, set the reason:

In places where multiple fume hoods work together, ventilation frequency conversion systems can be used to control each fume hood so that each fume hood can operate normally without affecting the operation of other fume hoods.

2, working principle:

When some of the fume hoods in the laboratory are not in use, signals are transmitted to the variable frequency system by sensing the changes in the throughput of the mains and changes in the differential pressure of the mains, so that the inverter will automatically adjust to control the rotational speed of the fan and thus control the row. Air volume.


Third, the laboratory exhaust gas treatment

The laboratory will inevitably produce corresponding exhaust gas in daily use, and the proper disposal of exhaust gas is also an important part of laboratory ventilation. If the exhaust gas in the laboratory is not treated and discharged to the atmosphere, it will inevitably pollute the environment and damage the human body. Generally, corresponding disposal plans will be made for the treatment of exhaust gas.


1. Exhaust gas types: organic exhaust gas, inorganic exhaust gas

a) Organic waste gas: toluene, formaldehyde, acetaldehyde, butyl acetate, banana water, methanol, ethanol, etc.;

b) Inorganic exhaust gas: nitrogen oxides, sulfides, hydrogen chloride, hydrogen cyanide, hydrogen chloride, sulfur dioxide and the like.


2. Treatment method: activated carbon adsorption method, water spray purification method

a). Activated carbon adsorption method:

Exhaust gas enters the activated carbon adsorber under the action of a fume hood and reacts with activated carbon, which is then hydrolyzed into carbon dioxide and water and discharged, thereby reducing environmental pollution.

b). Water spray purification method:

After the exhaust gas passes through the water spray device, the neutralized liquid that encounters the fine mist is absorbed into the surface of the liquid and enters the collection tank, and is discharged into the atmosphere after further defogging by filtration. The waste liquid in the collection tank will be further treated with waste liquid and then discharged to the outside world or recycled.


The above is related information released by Guangzhou Fine Laboratory Equipment Co., Ltd. The company provides laboratory system engineering design, laboratory ventilation air conditioning system, PP fume hoods and other services.


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