Three-Lobe Roots Blowers as Oxidation Fans in Power Plants
Oxidation blowers are critical auxiliary equipment in flue gas treatment systems of power plants, mainly responsible for providing sufficient oxygen to oxidize pollutants such as sulfites and nitrites in the absorption tower, ensuring the efficiency of desulfurization and denitrification processes. Three-lobe Roots fans, with their unique structural characteristics and stable operating performance, have become the preferred equipment for oxidation fans in thermal power plants, waste incineration power plants, and other power generation facilities. Their specific applications and advantages are as follows:
1.Core Application Scenario: Flue Gas Desulfurization (FGD) Systems
In the limestone-gypsum wet desulfurization process, the most widely used in power plants, sulfite (generated by the reaction of sulfur dioxide and limestone slurry) needs to be oxidized to sulfate to form gypsum—a recyclable by-product. Three-lobe Roots fans serve as oxidation fans to deliver large-volume air into the slurry of the absorption tower, creating an aerobic environment for the oxidation reaction.
These fans feature a positive displacement working principle, which enables them to deliver a stable air volume (fluctuation ≤ ±3%) regardless of pressure changes within the design range. This stability is crucial for the FGD system: the oxidation rate of sulfite is directly related to oxygen supply, and unstable air volume will lead to incomplete oxidation, reducing desulfurization efficiency (which may drop by more than 15%) and causing slurry scaling in the tower. The three-lobe rotor design of the fan also ensures smooth air supply, avoiding impact loads on the slurry mixing system and extending the service life of the absorption tower internals.
1. Adaptation to Power Plant Working Conditions: High Reliability and Durability
Power plant flue gas treatment systems operate continuously 24/7, and oxidation fans are required to have strong long-term running reliability. Three-lobe Roots fans have a simple structure with fewer moving parts—mainly composed of rotors, casings, and bearings—and the rotors are supported by high-precision rolling bearings with mature technology and low failure rates. This design reduces the probability of sudden equipment shutdowns, with an average continuous operation time of over 8,000 hours without maintenance, fully matching the long-period operation demand of power plants.
In addition, power plant workshops often have harsh environments with high dust concentration, large temperature fluctuations, and vibration from other equipment. Three-lobe Roots fans are equipped with reinforced casings and dust-proof air filters at the inlet, which can resist dust erosion and adapt to operating temperatures ranging from -10℃ to 50℃. Their inherent low-vibration characteristics (rotor dynamic balance accuracy up to G2.5 grade) also prevent resonance with surrounding equipment, ensuring stable operation even in complex working conditions.
3.Large Air Volume with Low Pressure, Meeting Oxidation Demand
The oxidation reaction in the desulfurization tower requires a large amount of air (the air volume demand is usually 3-5 times the theoretical oxygen consumption to ensure full oxidation), but the required pressure is relatively low (generally 40-80kPa) to avoid damaging the slurry distribution system. Three-lobe Roots fans are designed for medium-to-large air volume (ranging from 10m³/min to 1000m³/min) and low-to-medium pressure working conditions, which perfectly matches the parameter requirements of oxidation fans. Compared with centrifugal fans, they do not require complex speed-regulating devices to achieve the required air volume, simplifying the system configuration.
Suitable Model: Three-Lobe Roots Blowers
