Short wave ultraviolet light generating method and device

Abstract

The invention relates to a short wave ultraviolet light generating method and device. A space between a positive electrode and a negative electrode of a power source is filled with an inert gas (Rg) / halogen (X) mixture, wherein inert gases in the inert gas (Rg) / halogen (X) mixture are different in partial pressure. Quasimolecules (RgX*) are generated through excitation after power-on, and ultraviolet lights different in wave length are radiated in excited state quasimolecule de-excitation / transition processes. The device comprises a number of luminescent tubes and a pulsed power source, and the luminescent tubes are connected with the pulsed power source via power source leading wires. Each luminescent tube comprises an outer electrode, an inner electrode, an outer dielectric quartz tube, an inner dielectric quartz tube and the inert gas (Rg) / halogen (X) mixture. The short wave ultraviolet light generating method and device are characterized by simple and convenient short wavelength ultraviolet light generation, wide wavelength selection range, strong photon energy, compact device structure, convenient installation, large power, high pollutant decomposition efficiency and strong and fast sterilization and disinfection function.

Description

Technical field [0001] The invention relates to the field of ultraviolet light purification of air, sterilization and disinfection, and specifically discloses a method and a device for generating short-wave ultraviolet light. Background technique [0002] Shortwave ultraviolet light (200-280nm) has strong photon energy and can be absorbed by most substances, so it is widely used in the field of gas purification such as decomposition and purification of air pollutants, elimination of odors, and indoor air purification, especially in this wavelength range. Light has an excellent sterilization effect, making it one of the most economical / environmental sterilization methods. [0003] At present, low-pressure mercury lamps are mainly used to generate short-wavelength ultraviolet light. However, this method mainly has the following problems in the process of generating ultraviolet light: [0004] 1. The spectrum radiated by the low-pressure mercury lamp is mainly 253.7nm and 185nm, and th...

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Problems solved by technology

[0004] 1. There are two main spectral lines radiated by low-pressure mercury lamps: 253.7nm and 185nm, and the selection of spectral lines is narrow.

In addition, pollutants that can absorb 253.7nm light are very limited. Therefore, 253.7nm light is more used for sterilization and disinfection, and it is difficult to directly decompose pollutants; 185nm light can be absorbed by most pollutants, and the photon energy can reach 6.7eV, but the transmission distance of 185nm light in the air is very small, and the range of action is very limited. 185nm light is more absorbed by oxygen and water vapor, and active components can be produced to react with pollutants, reducing energy efficiency

[0005] 2. Low-pressure mercury lamps are easily affected by temperature during use, causing unstable working conditions

[0006] 3. The service life of low-pressure mercury lamps is short, generally no more than 15,000 hours. In order to reduce investment costs, low-pressure mercury lamps with a service life of less than 6,000 hours are very common.

[0007] 4. There are power connectors at both ends of the low-pressure mercury lamp tube, and it is inconvenient to lead out the power cord

[0008] 5. The power of low-pressure mercury lamps is generally not high, generally less than about 80W. When purifying large air volume air, the installed capacity is large and the cost is high; although the power of amalgam lamps can reach 600W, the cost is high and the service life has not been significantly improved.

[0009] 6. There is a risk of mercury pollution

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