UV wavelength classification and Shanxi TT exhaust gas treatment lamp wavelength
TT exhaust gas treatment / (finishing)
Ultraviolet exhaust gas treatment lamps and sewage treatment lamps (UV lamps) are actually a kind of low-pressure mercury lamps. Like ordinary fluorescent lamps, they are excited by low-pressure mercury vapor to emit ultraviolet rays. The difference is that the tube of the fluorescent lamp is made of ordinary glass, and the ultraviolet light of 253.7 nm and shorter is not transparent, and can only be absorbed by the phosphor of the inner wall of the tube to excite visible light. If you change the composition and proportion of the phosphor, it can emit light of different colors that we usually see. The lamps of general germicidal lamps are made of quartz glass. Because quartz glass has a high transmittance for each wavelength band of ultraviolet light, 80%-90%, it is the best material for exhaust gas treatment lamps and sewage treatment lamps.
Quartz glass and ordinary glass have great differences in performance, mainly because of different thermal expansion coefficients. Generally, the aluminum cover lamp head cannot be sealed. Therefore, the material of the exhaust gas treatment lamp and the sewage treatment lamp is mostly made of bakelite, plastic or ceramic.
Ultraviolet light is generated in a mercury discharge tube: an inert gas in which mercury vapor is suspended, and a quartz tube containing two electrodes and an insulator. Mercury reaches its highest point at 254 nm, 310 nm and 366 nm, producing radiation between 200 and 400 nm. Quartz cuts off the lower wavelength and does not transmit any radiation below 230 nm.
According to the biological effect, the ultraviolet light is divided into four bands according to the wavelength:
UVA band, wavelength 320 ~ 400nm, also known as long-wave black spot effect ultraviolet light. It has a strong penetrating power and can penetrate most transparent glass and plastic. More than 98% of the long-wave ultraviolet rays contained in sunlight can penetrate the ozone layer and clouds to reach the surface of the earth. UVA can directly reach the dermis layer of the skin, destroying elastic fibers and collagen fibers, and tanding our skin. The 360 ​​nm wavelength UVA ultraviolet light conforms to the phototaxis reaction curve of insects, and can be used to make trap light. UV-AUV at a wavelength of 300-420 nm can pass through a special colored glass tube that completely cuts off visible light, and emits only near-ultraviolet light centered at 365 nm. It can be used in ore identification, stage decoration, banknote verification and other places.
UVB band, wavelength 275 ~ 320nm, also known as medium wave erythema effect ultraviolet light. Medium penetration, its shorter wavelength is absorbed by transparent glass, and most of the medium-wave ultraviolet rays contained in sunlight are absorbed by the ozone layer, and less than 2% can reach the surface of the earth, which is particularly strong in summer and afternoon. UVB UV has an erythema effect on the human body, which can promote mineral metabolism and vitamin D formation in the body, but long-term or excessive exposure will cause the skin to tan, and cause redness and peeling. Ultraviolet health lamps and plant growth lamps are made using special transparent purple glass (without light below 254 nm) and phosphors with peaks around 300 nm.
UVC band, wavelength 200 ~ 275nm, also known as short-wave sterilization UV. It has the weakest penetration and cannot penetrate most of the transparent glass and plastic. The short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer. Short-wave ultraviolet rays are very harmful to the human body. Short-term exposure can burn the skin, and long-term or high-intensity exposure can also cause skin cancer. The ultraviolet exhaust gas treatment lamp emits UVC short-wave ultraviolet rays.
UVD band, wavelength less than 200~10nm, also known as vacuum ultraviolet light.
Low-pressure mercury lamps use lower mercury vapor pressure (
The strongest peaks of ultraviolet light absorption by deoxyribonucleic acid (DNA), ribonucleic acid (RNA) and nuclear proteins in bacteria range from 254 to 257 nm. When bacteria absorb ultraviolet rays, they cause DNA strand breakage, causing the cross-linking of nucleic acids and proteins to break, killing the biological activity of nucleic acids and causing bacterial death. The bactericidal efficiency of ultraviolet light on common bacterial viruses (radiation intensity: 30000μW/cm2), 185nm high-energy high-ozone UV ultraviolet light beam cleaves malodorous gas molecular bonds and bacterial molecular bonds, and simultaneously decomposes oxygen molecules in the air to generate free oxygen, thereby generating ozone.
Shanxi TT Waste Gas Treatment Technology Center exhaust gas treatment UV lamp is the use of ultraviolet vacuum wave 185nm wavelength, the principle is as follows:
1. High-energy, high-ozone UV ultraviolet light beam is used to irradiate malodorous gases, and odorous gases such as ammonia, trimethylamine, hydrogen sulfide, methyl sulfide, methyl mercaptan, methyl sulfide, dimethyl disulfide, carbon disulfide and styrene are vulcanized. The molecular chain structure of H2S, VOC, benzene, toluene and xylene makes the molecular chain of organic or inorganic macromolecules degraded into low molecular compounds such as CO2 and H2O under the irradiation of high-energy ultraviolet light.
2. The high-energy UV beam is used to crack the molecular bonds of bacteria in the malodorous gas, destroy the nucleic acid (DNA) of the bacteria, and then carry out oxidation reaction through ozone to completely achieve the purpose of deodorization and killing bacteria.
3, the use of high-energy high-ozone UV ultraviolet light beam decomposition of oxygen molecules in the air to produce free oxygen, that is, active oxygen, due to the imbalance of positive and negative electrons carried by free oxygen, so it needs to combine with oxygen molecules, and then produce ozone.
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