(1) electrostatic purification method

Working principle: High voltage electrostatic adsorption and dust removal working principle. Electrostatic type is the working principle of high voltage electrostatic adsorption and dust removal. Under the action of high voltage static electricity, the cathode line in the electrostatic field produces corona discharge, and a large number of negative ions are generated in the corona layer. Under the action of the electrostatic field, the negative ions continue to move to the anode. When the dust in the air passes through the electric field, the dust is impacted by the negative ions, and the charged dust is also affected by the electrostatic field, moving to the anode (dust collecting pole), and releasing the charge after reaching the anode.

Disadvantages: can remove drifting dust (can not remove toxic gas), the efficiency is lower and slower than the mechanical type, and easy to produce ozone, this model is rated as a poor purifier by the American market.

(2) physical purification method

1. Adsorption filtration - activated carbon

Activated carbon is a kind of porous carbon containing material, it has a highly developed pore structure, the porous structure of activated carbon provides a large amount of surface area for it, can fully contact with gas (impurities), so as to give activated carbon unique adsorption performance, so that it is very easy to achieve the purpose of absorbing and collecting impurities. Just like magnetism, all molecules have an attraction to each other.

Disadvantages: ordinary activated carbon and can not adsorb all toxic gases, low efficiency, easy desorption.

2. Mechanical Filter - HEPA(High efficiency Particul ateair Filter), Chinese meaning for High efficiency air Filter, reach the HEPA standard Filter, the efficiency of 0.3 micron reaches 99.998%, The characteristic of HEPA network is that air can pass through, but fine particles cannot. The HEPA filter is made up of a stack of subfiberglass membranes that fold back and forth in succession to form wavy spacers that hold and support the filter boundary.

(3) Chemical formula purification method

1. Photocatalytic method

Working principle: air through photocatalytic air purification device, light catalyst under the irradiation of light itself doesn't change, but can promote chemical reaction material harmful substances such as formaldehyde, benzene in the air under the action of photocatalytic degradation, generate non-toxic harmless substance, and the bacteria in the air was also get rid of ultraviolet light, result in air purification.

Disadvantages: broad spectrum but requires a low air flow rate, the purification speed is relatively slow and has a certain radiation to the human body, in Europe and the United States is the tide of purification.

2. Formaldehyde scavengers

Working principle: The use of chemical substances and formaldehyde chemical reaction, to achieve the purpose of removing formaldehyde.

2.1. Chemical reactions: Chemical reactions with formaldehyde generate carbon dioxide and water, such as ammonia, etc.

2.2 Biological: made of biological agents that can react with formaldehyde, such as urea, soy protein, amino acid, etc.

2.3 Plant: made from plant extracts, such as aloe vera, tea extract, etc.

2.4. Closed: Made of film-forming substances, forming a film to prevent formaldehyde release, such as chitosan, liquid paraffin, etc.

Disadvantages: First, the substances generated after the chemical reaction are likely to bring secondary pollution, and the phenomenon of exceeding the standard of secondary detection often occurs in the practice process.

The second is to absorb formaldehyde on the basis of not changing the chemical composition, reduce the content of formaldehyde in the air, but this way treats the symptoms rather than the root cause, and formaldehyde is easy to be released again.

3, pharmaceutical, catalytic method -- cold catalyst essence working principle: Cold catalyst, also known as natural catalyst, is a new type of air purification material after photocatalyst deodorization air purification material. It can catalyze reaction at room temperature, decompose a variety of harmful and flavorful gases into harmless and tasteless substances at room temperature and pressure, and change from simple physical adsorption to chemical adsorption, and decompose while adsorption. Remove formaldehyde, benzene, xylene, toluene, TVOV and other harmful gases to generate water and carbon dioxide. In the catalytic reaction process, the cold catalyst itself does not directly participate in the reaction. After the reaction, the cold catalyst does not change or lose, and plays a long-term role. Cold catalyst itself is non-toxic, non-corrosive, non-combustion, reaction products for water and carbon dioxide, do not produce secondary pollution, greatly prolonging the service life of adsorption materials.

(4) Other purification methods

1. The washing method Use of siphon and centrifugal principle, will be mixed in water purifying agent by siphon principle to inhale the lower part of the motor base coaxial centrifugal turbines in the straw, through exchange cover pole machine high speed rotating, reuse centrifugal principle, will be mixed in water purifying agent spray form a layer of water film within the inside, will absorb dust and bacteria in the air to the water, At the same time, the purified air will be blown into the room, quickly and effectively remove the indoor toxins, dust, smoke, odor, virus, etc., and produce a large number of fresh oxygen.

2. Hydroxyl anion method and the harmful gas floating in the air after contact, can reduce the pollution substances from the atmosphere, nitrogen oxides, cigarettes produced reactive oxygen species (oxygen free radicals), reduce the harm of excessive reactive oxygen species to the human body; Neutralizing and positively charged air dust settles without charge, so that the air is purified.