High-temperature-resistant filter specifically refers to an air filter specially used in high-temperature environments to remove high-temperature airflow particles. Generally can be divided into high-resistance primary efficiency filter and high-temperature-resistant high efficiency filter.
The biggest initial challenge for high temperature filters is the high temperature itself. High temperature places higher requirements on the filter materials in use and gas treatment and sealing systems, requiring their mechanical, thermal and chemical stability.
High temperature filter temperature range
Depending on the place of use, the temperature range can be between 250 degrees and 1,000 degrees.
The frame is generally a metal plate, including aluminum alloy, galvanized iron frame, galvanized aluminum frame, stainless steel, etc. The filter material is generally synthetic fiber, glass fiber, and synthetic fiber filter paper. The protection net is an aluminum net. The aluminum frame is self-extinguishing and strong enough to repel corrosion inhibitors at high temperatures. The filter medium is made of glass fiber and can operate perfectly at any temperature.
The most commonly used environment is in the car paint room. The baking paint room is a baking workshop built in the industrial spraying industry. After the product is sprayed, it needs to be baked at a high temperature. The ordinary air filter cannot withstand high temperature due to the frame and filter material. The device just solves this problem.
It is also widely used in the pharmaceutical industry.
Food and beverage industry. For example, in the dairy milk powder industry, modern milk dryers usually require high-temperature pre-filters to produce clean milk powder and infant formula milk powder. The depyrogenation tunnel and oven combine them to obtain absolutely sterile vials for filling medical products. The entire range is divided into two categories: 120 degrees, 250 degrees and 350 degrees.
These filters can withstand extremely high temperatures, making them effective for facilities that are often exposed to high temperatures.
From the structure, it can be divided into high temperature resistant folding filter, flat high temperature resistant filter, high temperature resistant bag filter. From the material, it is divided into high temperature resistant metal filter, glass fiber high temperature resistant filter and so on.
The high temperature resistant glass fiber filter is made of 100% borosilicate glass. They can withstand temperatures from 180 to 500 degrees Celsius and are proven to have very high flow and high load capacity. Although glass fiber filters are an option for high-temperature filtration, the various grades it offers depend on the pore size, and they can be suitable for a variety of laboratory applications. They can also be provided with an adhesive or not. The key mechanical stresses include the flexibility of the filter media during the cleaning cycle of the reverse pulse of compressed air or reverse air. Ceramics can withstand very high temperatures, but compared to other media, their length is more limited. The chemical stability of the air flow may also be disturbed, because temperature changes can produce condensed water.
Filter bags and pleated filters can have high filtration efficiency and can withstand severe cleaning cycles, but higher temperatures or burning due to fire during the filtration process can damage this type of filter.
Metals and ceramics can also be used for higher temperature applications. Where the lower temperature industrial fabric filter does not work, metal can withstand it. They can handle higher thermal stresses and certain transients in the process. The biggest disadvantage of high-temperature metal filters is corrosion caused by vulcanization.
Ceramic media is used at the highest temperature and has excellent filtration efficiency; however, ceramic filters generally cannot have as long life as other types of filters due to damage during the regeneration process by back pulse.
New materials such as carbon nanofibers will expand the temperature range and reduce the pressure drop of bags and discount filters, and enhance other components of the filtration process. Technologies related to the Internet of Things (IoT) may also play an important role in monitoring traffic and sharing information across technology and industry platforms.