Comparison of common purification technologies of fresh air system
1. "HEPA efficient filtration technology" has good filtration efficiency
HEPA is an internationally recognized and effective high-efficiency filter material. The HEPA filter consists of a stack of continuous sub-glass fiber membranes folded back and forth (PP, polypropylene material commonly used in air purifiers), forming a wave-shaped gasket for placement Supports the filtration boundary. The filtration efficiency of HEPA high-efficiency particulate filter is proportional to its surface area. At present, the HEPA high-efficiency particulate filters of the HEPA air purification device are multi-layer folded, and the area after unfolding is increased by more than ten times to dozens of times when folded, and the filtering efficiency is very outstanding.
Purification principle: particle inertia principle and diffusion principle.
Advantages of HEPA purification technology:
The effect of filtering particulate matter is very obvious. It has a strong ability to capture particles, a small pore size, a large adsorption capacity, high purification efficiency, and water absorption. The purification rate for particles of 0.3 microns is 99.97%. If you use it to filter cigarette smoke, the filtering effect can reach almost 100%. For particles above 2.5μm, only F8 can filter more than 99%.
Disadvantages of HEPA purification technology:
1. The dust in China is relatively serious, and the service life of HEPA may be relatively shortened, which means that HEPA filters need to be replaced frequently and the cost of use is high.
2. At present, the wind speed in the air purification industry is generally not working under the appropriate wind speed of HEPA. The high-demand places such as clean rooms ensure that the HEPA purification efficiency is about 0.3-0.5m / s. The wind speed in actual use is far Higher than this value.
2. "Electrostatic dust collection technology", no consumable dust removal
Electrostatic dust collection technology uses the principle of high-voltage electrostatic adsorption to filter pollutants in the air. It is also used as a basic purification technology and is widely used in indoor air cleaners.
Purification principle: the role of high voltage and strong electric field, particles are adsorbed on the negative plate or the positive plate, and different charges attract each other.
The advantages of electrostatic dust collection technology:
1. Efficiently remove particulate pollutants in the air, such as dust, soot, cigarette smell, and kitchen fumes.
2. At the same time, it can effectively adsorb gaseous pollutants in the air and filter out the pathogenic micro organisms in the air.
3. No consumables, cleaning and reusable, truly environmentally friendly.
Disadvantages of electrostatic dust collection technology:
1. Ozone is easy to produce, and it is only effective for large particles such as particulate matter. It is mainly used for dust removal, but it has little effect on removing chemical pollution caused by decoration such as formaldehyde, benzene series, TVOC, etc., which is equivalent to a junior and medium efficiency filter.
2. The essence of purification is also physical purification. The harmful substances are not chemically decomposed.
3. "Activated carbon adsorption technology", strong adsorption capacity
Activated carbon is divided into three types: coconut shells, fruit shells and coal. Coconut shell activated carbon has the strongest adsorption capacity.
Purification principle: Activated carbon has a porous structure, a large specific surface area, and can absorb small particles.
The advantages of activated carbon: it has a purification effect on all air pollutants. The adsorption capacity is very strong, which can effectively adsorb harmful substances (such as dust, particles, free molecules, bacteria, etc.) in the indoor air.
Disadvantages of activated carbon: activated carbon is only a physical filter, the pollutants are not eliminated, and can only be temporarily adsorbed, and as the temperature and wind speed increase, the adsorbed pollutants may be released, so the filter material must be replaced frequently to avoid adsorption saturation .
4. Negative ion technology, smoke deposition, supplement "air vitamin"
Through the negative ion generator, a large amount of negative ions, also called negative oxygen ions, is produced, which has the functions of sedation, hypnosis, analgesia, appetite increase, and blood pressure lowering. After the thunderstorm, people feel comfortable, because of the increase of negative ions in the air. Air negative ions can reduce the active oxygen (oxygen free radicals) generated by atmospheric pollutants, nitrogen oxides, cigarettes, etc., and reduce the harm of excessive active oxygen to the human body; neutralize the positively charged air and settle down after no charge, so that The air is purified.
Purification principle: neutralization of positive and negative charges and reduction of negative ions.
Negative ion advantages:
1. The sedimentation effect on second-hand smoke and other particulates is obvious, so the smoke smell can be removed to a certain extent, mainly because the smoke particulates in the air are reduced, and the smoke-flavored particulates settle to the ground, and more of them belong to physical purification.
2. It has the functions of anti-oxidation, anti-aging, enhancing human immunity and self-healing ability, which can effectively enhance the blood oxygen carrying capacity by about 20% and effectively promote the metabolism of the human body to improve sleep, which has a certain effect on sterilization.
Negative ion disadvantages:
1. The process of purifying the negative oxygen ions is mainly "physical purification", and the pollutants in the air are transferred to the ground.
2. Negative oxygen ions have a short life in air, so they need to be released continuously.
3. The pollution purification effect of formaldehyde and benzene series caused by decoration is very general, so you need to choose differently.
5. Ozone, sterilization and deodorization quickly and thoroughly
Activated oxygen technology is based on the application of ozone generators, and is also a basic purification technology. Any ion generator can basically release a certain concentration of ozone, and it is also widely used in most air purifiers. When using ozone sterilizing purifiers, it is necessary to pay strict attention to whether the ozone generation rate meets national standards (the ozone safety concentration specified by the Ministry of Health is 0.1ppm, and the industrial hygiene standard is 0.15ppm), and the ozone generator is used to purify indoor air. Personnel must leave when the disinfection is complete, open the window and ventilate for more than half an hour.
Purification principle: The strong oxidizing property of ozone can oxidize organic matter and odor molecules, and oxidize the functional structure of microorganisms to inactivate them.
Advantages of ozone purification:
Ozone has a rapid reaction to bacteria inactivation, and the thoroughness of sterilization is also beyond doubt. When used reasonably, it is the most environmentally friendly and thorough purification method recognized internationally. When its concentration reaches a certain value, sterilization and disinfection can even be completed instantly.
Disadvantages of ozone purification:
Excessive ozone is a serious hazard to human health! High concentrations of ozone can cause sore throat, chest tightness and cough, cause bronchitis and emphysema, cause neurotoxicity, and destroy the body's immune function. Because ozone is strongly irritating, people have long avoided it when they feel unwell, so there is generally no poisoning during use.
6. "Photocatalyst Catalytic Decomposition Technology" can play a role only with ultraviolet light
Photocatalysis technology: It is a technology that uses a new type of composite nano high-tech functional materials, which refers to photocatalytic reactions.
The principle of photocatalytic purification: under the irradiation of a light source, the photocatalyst can use the energy of a specific wavelength light source to produce a catalytic effect (redox reaction), so that the surrounding oxygen and water molecules are excited into highly active free radicals. These free radicals are also called "Photoplasma" can decompose almost all organic substances and some inorganic substances harmful to human body or environment. (Photocatalyst, also known as photocatalyst, is a type of semiconductor material represented by titanium dioxide (TiO2), which does not change under light irradiation but can promote chemical reactions and has a catalytic function (General term)
Photocatalytic advantages: photocatalytic technology has a broad spectrum of practical effects and high purification efficiency.
Disadvantages of photocatalysis: photocatalyst can only play its role under the irradiation of ultraviolet rays. This means that one must add an ultraviolet lamp to emit ultraviolet light (wavelength at 254nm or 365nm), but too much ultraviolet light is harmful to the human body, so it is necessary to avoid the ultraviolet lamp from being exposed; In an environment with many particles, the photocatalyst will "hibernate".
Concealer that is too light or too dense will make your makeup look unnatural. Therefore, you should choose different concealer according to your skin type to make your skin appear healthy. Paste and strip concealer have better covering effect, but the operation is more difficult; The concealer with low concealing ability can make the makeup natural because of its fresh texture. Generally, concealer is solid, but its viscosity is different. According to your own needs, you can choose to use large areas or local products.
Concealer,Private Label Concealer,Concealer Shade Finder,High Quality Concealer
Suzhou Yimeijia368 Biological Technology Co.,Ltd. , https://www.szymjbeauty.com