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Performance and Characteristics of High-Pressure Centrifugal Radial Fans in Industrial Applications Involving Corrosive Gases
When high-pressure centrifugal radial fans are used to handle corrosive gases, they exhibit distinct characteristics in terms of material selection, structural design, performance, and industrial adaptability:
1. Material and Anti-Corrosion Design
- Corrosion-resistant materials such as 316L stainless steel, fiberglass-reinforced plastic (FRP), and polytetrafluoroethylene (PTFE) must be adopted to resist erosion from acidic, alkaline, or chemical solvent-containing gases. For instance, 316L stainless steel impellers can effectively prevent sulfide corrosion when handling sulfur-containing flue gas; FRP volutes are suitable for highly corrosive chemical tail gas environments.
- Some components undergo surface anti-corrosion treatments like chrome plating and anti-corrosion coating spraying (e.g., epoxy resin coating) to enhance the corrosion resistance of parts prone to wear or frequent contact with corrosive media.
2. Performance
- High-pressure characteristics: It can provide high static pressure (usually up to several thousand Pascals), which can overcome the flow resistance of corrosive gases in long-distance pipelines, complex pipe networks, or high-resistance filtration devices, ensuring efficient gas transportation.
- Flow stability: The structure of the radial impeller minimizes the impact of pressure changes on the flow rate when handling corrosive gases, enabling it to maintain a relatively stable gas delivery volume even when operating conditions fluctuate.
- Efficiency and energy consumption: Although the efficiency of high-pressure centrifugal radial fans is slightly lower than that of backward-inclined fans, they still maintain a reasonable energy efficiency ratio under high-pressure operating conditions. This meets the "high-pressure, low-flow" gas transportation requirements in industrial production (e.g., gas pressurization in chemical reaction kettles, high-pressure injection in dust removal systems).
3. Industrial Application Adaptability
- Chemical industry: Used for transporting corrosive process gases containing acids, alkalis, or organic solvents, such as reaction tail gas in chemical synthesis processes and the collection and treatment of acid-alkali waste gas.
- Environmental protection field: In desulfurization and denitrification systems, it transports corrosive flue gas containing sulfur and nitrogen, and cooperates with environmental protection equipment to achieve pollutant purification.
- Pharmaceutical and food industries: Handles corrosive steam or clean gases (when sanitary requirements are required, stainless steel materials are used with polishing treatment), such as the discharge of corrosive waste gas in pharmaceutical workshops and gas circulation during food fermentation.
4. Maintenance and Service Life
- Due to long-term exposure to corrosive gases, it is necessary to regularly inspect the integrity of the anti-corrosion coating and the wear condition of the impeller, and replace parts that are aged or severely corroded in a timely manner to extend the service life of the equipment.
- Fans with a modular design facilitate the disassembly and replacement of components, reducing maintenance difficulty and downtime, and ensuring the continuity of industrial production.
In summary, through targeted anti-corrosion design and high-pressure performance, high-pressure centrifugal radial fans have become key equipment for handling corrosive gases in the industrial field, playing an important role in ensuring production safety and improving process efficiency.
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