A method for arranging ultraviolet lamps in secondary water supply ultraviolet disinfection equipment

Abstract

The invention discloses a method for arranging ultraviolet lamps in ultraviolet disinfection equipment for secondary water supply. The irradiation time required to receive the effective dose of safe ultraviolet rays at different distances from the center of the tube; 3. Calculate the theoretical minimum value of the cross-sectional area of ​​the corresponding disinfection container; 4. Determine the arrangement and number of ultraviolet lamps in the disinfection container; 5. First Determine the best arrangement scheme, and then determine the cross-sectional size of the disinfection container. The present invention determines the optimal arrangement scheme of ultraviolet lamps in the disinfection container under the requirement of meeting the maximum water flow rate through the method of quantitative calculation, and determines the cross-sectional size of the disinfection container so as to minimize the ineffectiveness of ultraviolet disinfection equipment. The risk of exerting the disinfection and sterilization effect provides an effective guarantee for the safety of drinking water.

Description

technical field [0001] The invention relates to the field of secondary water supply disinfection of urban water supply pipe network systems, in particular to a method for arranging ultraviolet lamps in secondary water supply ultraviolet disinfection equipment. Background technique [0002] As early as 1878, humans discovered that ultraviolet rays in sunlight have a sterilizing effect. The principle of ultraviolet sterilization is that ultraviolet rays of appropriate wavelengths can destroy the molecular structure of DNA or RNA in microbial cells, causing growth and regenerative cells to die, and achieve the effect of sterilization. Ultraviolet rays are divided into four different bands according to the wavelength range: UVA (400-315nm), UVB (315-280nm), UVC (280-200nm) and vacuum ultraviolet (200-100nm). Since UVA and UVB are outside the range of microbial absorption peaks, the sterilizing speed is very slow, so in practical applications, this part of ultraviolet light is a...

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Problems solved by technology

3) Medium-voltage high-intensity ultraviolet lamp: emit multi-wavelength electromagnetic waves (200-600nm), only about 27% to 44% of the ultraviolet energy is within the range of UVC, only 7% of the output is near 254nm, and the photoelectric conversion rate is 10% to 15%, which is one-third of the low-pressure lamp, and its energy consumption is 3-3.5 times that of the low-pressure lamp; the operating temperature is 600-800°C, the pressure is 0.013MPa-1.33MPa, and the energy in the lamp is not turned on. Mercury is in a liquid state, so it needs to be stored and used very carefully, otherwise there is a risk of leakage; in addition, due to the high operating temperature of the medium-pressure lamp tube, it is easy to cause fouling of the lamp tube, which will greatly reduce the effective ultraviolet intensity of the lamp tube, and easily cause damage to the lamp. The tube and quartz sleeve are damaged, and a specially designed descaling device is required for normal operation. It is not suitable for use in places such as secondary water supply tanks where there are no professional guards; Up to 1500W, so the number of lamps used can be greatly reduced, and the occupied area is also reduced accordingly. It is suitable for large sewage treatment plants, rainstorm overflow and occasions with high space utilization requirements

But in view of the following two reasons, this calculation method is incorrect: 1) when tap water flows through the disinfection container of the ultraviolet disinfection equipment, it flows from one end to the other at one time, and there is no back and forth flow; The attenuation of the water flow is attenuated according to the exponential level as the distance increases, so the ultraviolet radiation received by the water flow is mainly affected by the nearest ultraviolet lamp, and other ultraviolet lamps have little effect

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