Ceramic Filters: The “Purification Experts” in Harsh High-Temperature Environments
In the field of industrial dust removal, ceramic filters have become the core equipment for purifying high-temperature flue gas and corrosive gases due to their outstanding high-temperature resistance and corrosion resistance. They play an irreplaceable role in demanding industrial conditions such as waste incineration, coal-fired power generation, and metallurgy.
1. Material and Structural Characteristics
The core filter materials of ceramic filters mostly use ceramic materials such as silicon carbide (SiC), aluminum oxide (Al₂O₃), and corundum. These materials have three significant advantages:
High-temperature resistance: The long-term operating temperature can reach 800-1200℃, and the instantaneous temperature resistance even exceeds 1400℃. It can directly handle high-temperature flue gas without the need for additional cooling equipment, reducing energy loss.
Chemical stability: It has strong resistance to corrosive media such as acids, alkalis, and organic solvents. It is not easily eroded in sulfur-containing flue gas (such as from coal-fired power plants) and chlorine-containing exhaust gas (from waste incineration).
High mechanical strength: Excellent in compression and impact resistance, capable of withstanding the high-pressure air flow impact during pulse cleaning (usually 0.5-0.8MPa), and not prone to damage.
Its structure is mostly in the form of honeycomb or tube-like. The honeycomb filter is composed of hundreds of parallel micro-porous channels. The inner walls of the channels are covered with breathable holes with diameters ranging from 1 to 50 μm. The smoke gas flows into the channels, and the dust is retained on the hole walls. The clean gas passes through the micro-pores and is discharged. The tubular filter is similar to a bundle of ceramic tubes. The outer walls of the tubes are the filter layer. The dusty gas flows into the tubes from the outside, and the dust adheres to the tube walls. During cleaning, compressed air is sprayed from the inside of the tubes in the opposite direction to achieve dust removal.
