Fresh air system is a popular indoor ventilation equipment in the market. It can not only realize the indoor and outdoor ventilation under the condition of closing windows, but also purify the air entering the indoor, which can ensure the health and safety of indoor people to a great extent. The fresh air system is so easy to use, to a large extent, it can not do without its purification technology. What are the common purification technologies in the fresh air system?
1、 HEPA high efficiency filtration technology
HEPA is an internationally recognized high efficiency filter material. The HEPA filter is composed of a stack of continuous folded sub glass fiber membrane, which forms a wavy gasket to place and support the filter medium. The filtration efficiency of HEPA high efficiency particulate filter is directly proportional to its surface area.
At present, the HEPA high efficiency particulate filter of HEPA air purification device is multi-layer folded, and the area after unfolding is more than ten times to dozens of times than that when folding, so the filtration efficiency is very outstanding.
Purification principle: particle inertia principle and diffusion principle.
2、 Electrostatic dust collection technology
Electrostatic dust collection technology is the use of high-voltage electrostatic adsorption principle, the air pollutants will be filtered, also as a basic purification technology, is widely used in indoor air purifier.
Purification principle: under the action of high voltage and strong electric field, particles are adsorbed on the negative plate or positive plate, and heterogeneous charges attract each other.
3、 Activated carbon adsorption technology
There are three kinds of activated carbon: coconut shell, fruit shell and coal. The adsorption capacity of coconut shell activated carbon is the strongest.
The structure of porous activated carbon is small, and the specific surface area of activated carbon is large.
4、 Negative ion technology, smoke deposition
Through the negative ion generator, produce a large number of negative ions, also known as negative oxygen ions, with sedation, hypnosis, analgesia, increase appetite, lower blood pressure and other functions. Air anion can reduce the active oxygen (oxygen free radical) produced by air pollutants, nitrogen oxides, cigarettes, etc., reduce the harm of excessive active oxygen to human body; neutralize the positively charged air dust and settle it after no charge, so that the air can be purified.
Purification principle: neutralization of positive and negative charges, and reduction of negative ions.
5、 Ozone, sterilization and deodorization
Active oxygen technology is based on the application of ozone generator, and it is also a basic purification technology. All ion generators can basically release a certain concentration of ozone, and it is also widely used in most air purifiers.
Purification principle: the strong oxidation of ozone can oxidize organic matter and odor molecules, oxidize the functional structure of microorganisms and inactivate them.
6、 Photocatalytic decomposition technology
Photocatalysis is a kind of technology that uses new composite nano high-tech functional materials, which refers to photocatalytic reaction. Only ultraviolet rays can work.
Principle of photocatalytic purification: under the illumination of light source, photocatalyst can use the energy of specific wavelength light source to produce catalytic action (oxidation-reduction reaction), so that the surrounding oxygen and water molecules can be excited into highly active free radicals. These free radicals, also known as "photoplasma", can decompose almost all organic substances and some inorganic substances harmful to human body or environment. (photocatalyst, also known as photocatalyst, is a general term for a class of semiconductor materials represented by titanium dioxide, which can not change itself under light irradiation, but can promote chemical reaction and have catalytic function.)
7、 Molecular complexation Technology
At present, molecular complexation technology can effectively and thoroughly remove indoor decoration pollution, especially chemical pollution. The technology first collects and captures formaldehyde, benzene, ammonia and other pollutants from indoor decoration, and then quickly transforms gaseous short molecular chain substances such as formaldehyde and ammonia into irreversible long molecular chain solid substances through the complex decomposition system composed of formaldehyde capture agent and water, and decomposes to form ammonia salt, which is agglomerated and precipitated in water to remove and separate, and then discharges clean air.
Purification principle: this technology uses the water-soluble characteristics of formaldehyde and ammonia to introduce the indoor air into the purifier, and passes the toxic gas into the complex decomposition system composed of molecular complexing agent (formaldehyde scavenger) and water, and finally converts the pollutants in the indoor air into irreversible neutral macromolecular chain solid matter, and then removes the relatively clean air, so as to achieve the goal of purification effect.
8、 Low temperature asymmetric plasma air purification technology
At present, the low-temperature asymmetric plasma air purification technology is mainly realized by dielectric barrier discharge, namely DBD low-temperature plasma. Now there are mainly two kinds of low-temperature plasma, one is positive high negative low DBD low-temperature plasma, with strong purification ability, which is mainly used in industrial purification and unmanned environment purification; the other is negative high positive low DBD low-temperature plasma, referred to as NBD plasma, which is mainly used in human settlements Man machine coexistence environment.
Purification principle: low temperature asymmetric plasma air purification technology can make a large number of plasmas in the air impact step by step, produce electrochemical reaction, and rapidly degrade toxic and harmful gases, living viruses and bacteria, so as to effectively kill virus, sterilize, remove odor, eliminate smoke and dust, and produce no toxic substances. =