The working principle and characteristics of the activated carbon filter

23/07/2020

    In the air purification industry, there are four types of filter materials for air filters, namely synthetic fiber filter cotton, glass fiber filter cotton, non-woven fabric, and activated carbon filter cotton. Among them, the activated carbon filter is a composite of high-efficiency adsorbed activated carbon fiber and filter cotton; the surface adsorption capacity is strong, which can effectively control the odor and organic pollution in the air, and solve the effects of central processing odor and air pollution in the air conditioning and ventilation system. Can effectively remove pollution and clean the air.

    So, what is the working principle of the activated carbon filter?

    For air filters, activated carbon is basically a sponge-like substance. Activated carbon can absorb odorous air. Specifically, it absorbs chemicals in the gas to make it odorless. To a certain extent, It is called the "odor threshold", which means that your nose cannot detect the presence of odorous compounds in the air, so it smells no odor. Although activated carbon can adsorb chemical substances, it is only a maximum of 99%-99.99%. About, the adsorption level decreases with the use time of activated carbon. How does the nose smell? This is a problem because the level of odorous compounds in the air rises slightly, making it higher than the "odor threshold", and suddenly a bad smell is smelled.

    There are a large number of invisible micropores in the activated carbon material, which has a large adsorption area. In the activated carbon the size of rice grains, the inner area of ​​the micropores is more than ten square meters. After the free molecules come into contact with activated carbon, they condense into liquid in the micropores and stay in the micropores due to the capillary principle, and some are integrated with the material. The adsorption without obvious chemical reaction is called physical adsorption. Generally, the activated carbon filter performs a chemical reaction.

    Some processes the activated carbon, and the adsorbed particles react with the material to generate solid matter or harmless gas, which is called chemical adsorption. During the use of activated carbon, the adsorption capacity of the material is continuously weakened. When it weakens to a certain level, the filter will be scrapped. If it is only physical adsorption, heating or steam fumigation can remove harmful gases from the activated carbon and regenerate the activated carbon.

    Activated carbon filters have a wide range of uses, such as cleanroom fresh air conditioning systems, pre-filtering of fresh air units, central air-conditioning system fresh air primary filtering, fresh air purification equipment inlet pre-filtering, waste gas discharge primary or secondary filtering, etc.

    Activated carbon filter product characteristics

    Strong surface adsorption capacity, with a variety of filter media options

    High carbon content, good adsorption effect, good air permeability, low airflow resistance

    Effectively filter dust, odor and organic pollutants in the air

    Purification and adsorption of harmful gases such as formaldehyde and toluene