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How to choose a high temperature-resistant air filter
How to choose a high temperature-resistant air filter(I) ConsiderationsWhen choosing a high-temperature-resistant air filter, you need to consider several key factors comprehensively. Temperature range: First, determine the maximum operating temperature range required for the application. Different application scenarios have very different temperature requirements. For example, the high-temperature environment in some industrial production may be as high as 400℃ or even higher. Only by ensuring that the material and design of the selected high-temperature resistant air filter can remain stable within this specific temperature range can its normal operation be guaranteed. For example, for an oven production line with an operating temperature of 200-400℃, a filter with a temperature resistance within this range should be selected. The material is generally glass fiber yarn, and the temperature resistance of pure glass fiber can reach about 450℃. Material selection: Materials that have been verified to be resistant to high temperatures are crucial. As high-temperature glass fiber, metal fiber, etc., these materials can maintain stability and durability in high-temperature environments. High-temperature glass fiber has the advantages of high filtration efficiency and large dust-holding capacity, while metal fiber has high strength and can adapt to more complex environments. Filter efficiency and type: Select the appropriate filter type according to the application's requirements for filtration efficiency. High-efficiency filters usually use high-density, fine fibers or multi-layer structures to effectively capture tiny particles. Different types of filters, such as high-efficiency high-temperature filters, metal mesh filters (flame arresters), and high-temperature glass fiber cotton filters, are suitable for different scenarios. If you have high requirements for filtering accuracy, you can choose a high-efficiency high-temperature filter, which has a laser counting efficiency level of H13 (EN1822) and a maximum temperature resistance of 350°C for continuous operation. Flow requirements: Consider the airflow requirements in the application and select a high-temperature air filter of appropriate size and design to ensure that it can handle the required airflow. If the flow is too large and the filter size is too small, the filtering effect will be poor; conversely, if the flow is small and the filter size is large, it will cause cost waste. Application environment: Other factors in the application environment cannot be ignored, such as corrosive gases, humidity, etc. If there are corrosive gases in the environment, it is necessary to select a filter material that can resist corrosion; if the humidity is high, the moisture resistance of the filter must also be considered. (II) Selection points Meet fire protection requirements: Air filters should meet fire protection requirements, and high-efficiency air filters are divided into three levels according to the degree of fire resistance. For level 1 filters, all materials are non-flammable and meet GB8624-1997 A grade; for level 2 filters, the filter material is non-flammable material that meets GB8624-1997 A grade, and the partitions and frames can be made of flammable materials that meet GB8624-1997 B2 grade; for level 3 filters, all materials can be made of GB8624-1997 B3 grade. In some places with high fire protection requirements, such as pharmaceutical factories and electronics factories, high-temperature-resistant air filters that meet the corresponding fire protection grades should be selected. Set at the end of the purification air conditioning system: High-efficiency air filters should not be used alone but should be set at the end of the purification air conditioning system. This ensures that the air treated by the filter meets higher cleanliness requirements and provides better air quality for subsequent production or working environments. Calculate the final resistance as twice the initial resistance: When designing, the final resistance can be twice the initial resistance as the calculated resistance of the filter. For example, if the initial resistance of a high temperature-resistant air filter is 100Pa, the final resistance can be calculated as 200Pa. In this way, the service life and replacement cycle of the filter can be evaluated more accurately. Inspection standard: According to the method specified in GB/T6165-1985 "High-Efficiency Air Filter Performance Test Method Permeability and Resistance", the filter with a permeability ≤0.1% (i.e., efficiency ≥99.9%) or a count permeability of particles with a particle size ≥0.1μm ≤0.001% (i.e., efficiency ≥99.999%) is a high-efficiency air filter. When selecting a high temperature-resistant air filter, ensure that it meets these strict inspection standards to ensure the filtering effect. Initial resistance limit: The initial resistance of the high-efficiency air filter shall not exceed 10% of the resistance of the product sample. This is to ensure that the filter will not affect the airflow and the normal operation of the system due to excessive resistance during use. Focus on control parameters: The main control parameters for the selection of high-efficiency air filters include filtration efficiency, rated air volume, initial resistance at rated air volume, dust holding capacity, etc. When choosing a filter, you should consider these parameters comprehensively according to the actual application requirements and choose the most suitable product. Combined filter air outlet: In general non-parallel flow clean air conditioning systems, combined filter air outlets are often used. This combination can improve the filtering effect and is also easy to install and maintain. Filter material selection: Common filter materials for high-efficiency air filters include ultra-fine glass fibers. Ultra-fine glass fiber filter materials have the advantages of high filtration efficiency, large dust-holding capacity, and low resistance, and are suitable for various high-temperature environments. |
