What is the structure of a flow-through ultraviolet sterilizer?
2022-07-26
At Flow-through ultraviolet sterilizer Within the chamber, the intensity of ultraviolet light varies at different points. If the water body achieves good radial mixing as it flows through the chamber of a flow-through UV sterilizer, each unit volume within the chamber will receive a roughly equal dose of UV radiation. However, if mixing is inadequate (as is typically the case), the water body will receive uneven doses of UV radiation, and some microorganisms, failing to receive a sufficient dose, will remain viable even after passing through the chamber of the flow-through UV sterilizer.
During the disinfection process with a flow-through ultraviolet sterilizer, water passes through three main flow sections: the inlet section, the disinfection section, and the outlet section. With current UV sterilization technology, as soon as water enters the chamber, a layer of water immediately forms around the quartz sleeve. The position of the UV lamp relative to this water layer is relatively fixed, typically arranged in parallel streamlines.
In flow-through ultraviolet sterilizers, the intensity of ultraviolet radiation emitted by the UV germicidal lamp diminishes as the depth of the water layer increases. Therefore, when calculating the required UV dose, in order to achieve a higher disinfection effect within the chamber of the flow-through UV sterilizer, the design of the UV sterilizer must take into account the UV dose received by microorganisms located in the water layer farther away from the UV lamp to determine the appropriate low-intensity UV irradiation. At the same time, the UV radiation dose obtained in the water layer between the quartz sleeve and the close proximity area must exceed the dose necessary to effectively kill microorganisms. The greater the radiation dose obtained from the water near the quartz sleeve, the more energy is wasted. This represents a structural flaw inherent in current UV disinfection systems.
The inner walls of the chamber in a flow-through ultraviolet sterilizer are polished to maximize the emission of ultraviolet light, thereby increasing the UV radiation dose on the outer layer of the water and enhancing the sterilization efficiency of the device. To slow down scale buildup in the quartz sleeve and maintain its high UV transmittance, it is advisable, when treating wastewater, to equip the system with an automatic cleaning device for the quartz sleeve whenever possible, ensuring the reliability of the disinfection process.
The automatic cleaning device for quartz sleeves consists of a drive unit, a cleaning ring, and related transmission components.
Drive mechanisms are generally categorized into three types: motor-driven, hydraulic-driven, and pneumatic-driven. Motor-driven systems have high costs and complex transmission structures, making them unsuitable for the automatic cleaning drive of flow-through ultraviolet sterilizers. Hydraulic-driven systems are costly and carry a risk of hydraulic oil leakage, so very few manufacturers actually adopt them. Compressed air-driven systems, on the other hand, offer advantages such as low cost, safety and reliability, and simple structure. The drive mechanism adopted by our company is precisely a pneumatic-driven system.
In the chamber of a flow-through UV sterilizer, the intensity of ultraviolet radiation varies at different points. If the water achieves good radial mixing as it flows through the chamber of the flow-through UV sterilizer, each unit volume within the chamber will receive a roughly equal dose of UV radiation. However, if mixing is insufficient (which is typically the case), the water will receive uneven doses of UV radiation. As a result, some microorganisms, having not received a sufficient dose of UV radiation, will remain viable even after passing through the chamber of the flow-through UV sterilizer.
During the disinfection process with a flow-through ultraviolet sterilizer, water passes through three main flow sections: the inlet section, the disinfection section, and the outlet section. With current UV sterilization technology, as soon as water enters the chamber, a layer of water immediately forms around the quartz sleeve. The position of the UV lamp relative to this water layer is relatively fixed, typically arranged in parallel streamlines. In ultraviolet (UV) sterilizers, the intensity of UV radiation emitted by the UV germicidal lamp diminishes as the depth of the water layer increases. Therefore, when calculating the required UV dose, to achieve a higher disinfection efficiency within the chamber of a flow-through UV sterilizer, it is necessary—during the design phase—to determine the minimum UV irradiance level based on the UV dose received by microorganisms located in the water layer farther away from the UV lamp. At the same time, the UV radiation dose obtained in the water layer between the quartz sleeve and the close vicinity must exceed the dose needed to effectively kill microorganisms. The greater the UV radiation dose obtained from the water near the quartz sleeve, the more energy is wasted. This represents a structural flaw inherent in current UV disinfection systems.
The inner walls of the chamber in a flow-through ultraviolet sterilizer are polished to maximize the emission of ultraviolet light, thereby increasing the UV radiation dose on the outer layer of the water and enhancing the sterilizer’s disinfection efficiency. To slow down scaling inside the quartz sleeve and maintain its high UV transmittance, it is advisable, when treating wastewater, to equip the system as much as possible with an automatic cleaning device for the quartz sleeve, ensuring reliable disinfection performance.
The automatic cleaning device for quartz sleeves consists of a drive unit, a cleaning ring, and related transmission components.
Drive mechanisms are generally categorized into three types: motor-driven, hydraulic-driven, and pneumatic-driven. Motor-driven systems have high costs and complex transmission structures, making them unsuitable for the automatic cleaning drive of flow-through ultraviolet sterilizers. Hydraulic-driven systems are costly and carry a risk of hydraulic oil leakage, so very few manufacturers actually adopt them. Compressed air-driven systems, on the other hand, offer advantages such as low cost, safety and reliability, and simple structure. The drive mechanism adopted by our company is precisely a pneumatic-driven system.
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