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What is the purification principle of the clean shed?
What is the purification principle of the clean shed?The purification principle of the clean shed is mainly through the efficient filtration system, reasonable airflow organization, and positive pressure control, to achieve effective removal and control of pollutants in the air, to provide a high cleanliness environment for specific areas, the following is a specific introduction:High-efficiency filtration system The primary effect filter is usually set up at the air inlet of the clean shed, and its main function is to filter out large particulate pollutants in the air, such as dust, hair, fibers, etc. The primary effect filter is generally made of coarse and medium porous fiber materials or filters, which can remove particles with a particle size greater than 5 microns, which can effectively protect the subsequent medium effect and high-efficiency filters and extend their service life. Medium filter: The air after the initial filter enters the medium filter, the filter accuracy of the medium filter is relatively high, and the particle size can be removed between 1-5 microns. The medium effect filter often uses glass fiber, synthetic fiber, and other materials, by increasing the filter area and optimizing the fiber structure, improving the filtration efficiency, and further reducing the content of pollutants in the air. High-efficiency filtration: A high-efficiency filter is the core part of the clean shed purification system, generally using ultrafine glass fiber filter paper or synthetic fiber filter paper and other materials, its particle size of less than 0.3-micron filtration efficiency can reach more than 99.97%. It uses the principles of Brownian motion, interception, inertial collision, diffusion, etc., to intercept small particles of pollutants in the air on the filter paper, so that the air through the filter can reach a high cleanliness standard. Air distribution Unidirectional flow: For some clean sheds with high cleanliness requirements, unidirectional flow is often used in the form of air organization, including vertical unidirectional flow and horizontal unidirectional flow. Vertical unidirectional flow means that the air flows vertically down from the top of the clean shed, and horizontal unidirectional flow means that the air flows horizontally from one side to the other side. In the unidirectional flow system, the air flows at a uniform speed and direction, like a "piston" to "push" the pollutants out of the clean shed, so that the indoor pollutants have no chance to accumulate and spread, to maintain a highly clean environment. Turbulence: In some clean sheds with relatively low cleanliness requirements, turbulence may be used in the form of airflow organization. Turbulence refers to the irregular flow of air in the clean shed and the discharge of pollutants outside through continuous mixing and dilution. Although the purification effect of turbulence is not as good as unidirectional flow, the cleanliness of the clean booth can be ensured to a certain extent by rationally designing the position and number of the supply and return air outlets, as well as controlling the appropriate supply air volume and wind speed. Positive pressure control Maintain pressure difference: Clean sheds usually maintain an internal pressure higher than the external environmental pressure, forming a positive pressure environment. In general, the pressure difference between the clean shed and the adjacent unclean area should be kept between 5-10 pascals. By installing pressure sensors and pressure regulating devices, the pressure in the clean shed is monitored and adjusted in real-time to ensure that the positive pressure value is within the specified range. Prevent the intrusion of pollutants: The positive pressure environment can prevent the outside unfiltered air and pollutants from entering the inside of the clean shed. When there is a door or other opening, because the internal pressure is higher than the outside, the air will flow out from the inside of the clean shed, forming an "air barrier", to effectively prevent the intrusion of external pollutants and maintain the cleanliness of the clean shed. |
