Urban rail transit, such as subways, light rails, and trams, has the characteristics of energy saving, large capacity, and safety, and is a green and environmentally friendly transportation system. With the acceleration of my country's urbanization process, traffic pressure in large and medium-sized cities is increasing, and urban rail transit construction is developing rapidly.
However, the environment in the urban rail transit carriages is relatively closed and densely populated, which can easily lead to the mutual infection of bacteria and viruses, and there are greater health and safety risks, especially when the new crown epidemic occurs, rail transit was once forced to stop operating. At present, the most effective solution has been proven to be uniformly wearing masks for people in the car, and continuous and effective disinfection of the air in the car.
At present, there are many disinfection methods used in rail transit, mainly including disinfectants and ultraviolet light (mercury lamps and UVC LED).
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Disinfectant is a more traditional method of disinfection, with low cost and weak disinfection effect. In addition, the disinfectant can be volatilized and degraded, which is harmful to the human body and cannot have a long-term effect.
The principle of ultraviolet disinfection and sterilization is to destroy the genetic material DNA or RNA of bacteria and viruses, so that bacteria and viruses cannot reproduce, the sterilization effect is thorough, and almost all bacteria and viruses can be killed. There are two main types of ultraviolet light sources used for sterilization: traditional mercury lamps and UVC LEDs.
Among them, the mercury lamp has a good sterilization effect, but it is easy to break and cause mercury pollution. Ozone pollution will be generated during the start-up process, which is harmful to the human body. Therefore, some people cannot turn on the lamp and cannot continue to kill.
UVC LED can quickly and efficiently kill almost all bacteria and viruses, and is harmless to the human body. It can also accurately control the sterilization process. It can be used throughout people's rail transit to achieve continuous and effective disinfection. Although the current cost of UVC LEDs is relatively high, the service life is several times that of mercury lamps, which saves the cost of procurement and installation to a certain extent.
In the rail transit air ultraviolet disinfection system, the sterilization device loaded with the UVC LED module is installed in the air circulation air duct on the top of the rail transit car. When the air inside the car circulates into the air duct, the sterilization device starts to work, in just a few minutes More than 90% of the bacteria and viruses in the air can be killed inside, and then fresh air can be blown into the compartment. Through this circulation mode, the compartment can be fully disinfected immediately, which greatly reduces the risk of mutual infection among the people in the car.
Picture: Rail transit air UV disinfection system
It is reported that at present, there are already domestic subways that will be the first to install UVC LED sterilization devices at the end of the year and try to run them. In the future, they will gradually be extended to rail transit nationwide. In fact, not only rail transit, public transportation, schools, hospitals and other crowded places, UVC LEDs are needed for efficient and continuous disinfection solutions. According to statistics, there will be 7,500 new urban rail transit vehicles in 2020, and the output value of UVC LED sterilization device demand will reach about 9 billion, which is a huge and extremely potential market.
It is reported that the UVC LED sterilization device that will be installed on the subway at the end of the year is provided by Shanxi Zhongke Lu'an Semiconductor Technology Research Institute Co., Ltd. It is also the first company in China to apply deep ultraviolet sterilization to rail transit scenarios. It is understood that Zhongke Luan has signed a strategic cooperation agreement with CRRC, and has completed the installation and commissioning of samples.
It is understood that the UVCLED sterilization device supplied to CRRC this time, the overall supporting solutions from UVCLED chip, package to module are provided by Zhongke Luan, using the deep ultraviolet LED solution with the highest sterilization rate of 260-265nm wavelength. Zhongke Lu’an has a number of independent intellectual property rights and core patented technologies in the field of UV LEDs, covering all links in the industrial chain from equipment manufacturing, epitaxial growth to chip manufacturing, and controls the quality of products from the source, while at the same time packaging devices , Module development, and application-side product industrial design to provide more comprehensive technical support.
Zhongke Lu'an is a comprehensive enterprise integrating R&D and industrialization of semiconductor chips, packaging, modules and application technologies. It has established a "UV photoelectric industry double innovation incubation base" with relevant government departments to participate in the promotion of application technologies Development and achievement transformation.
Entering October, the epidemic situation in many parts of the world has once again entered a stage of rapid deterioration, and the upgrade of the public health defense mechanism has become urgent. With its advantages of non-toxic and environmental protection, small size, longer life, lower energy consumption, lower heat radiation, and higher reliability, UVC LED will gradually be applied to more fields, bringing people more convenient, safe and sanitary Guaranteed.