Power plant dilution fans, such as Roots blowers, are mainly applied in fields such as wastewater treatment, pneumatic transportation, aquaculture, chemical and metallurgical industries, and power generation. In wastewater treatment, they supply gas to the aeration tanks to overcome the high water pressure during deep-water aeration, promoting microbial growth and metabolism, accelerating the decomposition of organic matter, and purifying the wastewater. In pneumatic transportation, they mix powdery and granular materials with air and use high-pressure air flow to transport them to the designated locations, featuring long transportation distances, high efficiency, and no pollution. In aquaculture, they inject air into the water bodies to increase the dissolved oxygen content, providing a favorable living environment for fish and other aquatic organisms, and promoting their growth and health. In chemical and metallurgical industries, they are used for gas circulation in high-pressure reactors and furnace cleaning, providing necessary gas atmospheres and pressure conditions for chemical reactions and metallurgical processes. In the power industry, they provide oxidizing air for desulfurization and denitrification systems, helping to remove sulfur dioxide and nitrogen oxides from flue gas, reducing environmental pollution.
The dilution fan of the power plant, the Roots blower, is a type of positive displacement blower. Its working principle involves two rotors in a cycloidal or similar shape, a casing, side plates, and synchronous gears. The rotor shafts are parallel, and the rotors are driven by an electric motor through a pair of synchronous gears at the same speed but in opposite directions. During rotation, the rotors carry the gas out from the inlet; each concave surface forms a working volume with the cylinder wall, pushing the gas to the exhaust port without internal compression. When the high-speed gas flow approaches the exhaust port, due to the backflow on the high-pressure exhaust side, the pressure within the working volume suddenly increases, thereby expelling the gas.
The structural features of the centrifugal blower of the power plant, namely the Roots blower, include an enhanced casing made of high-strength cast iron or cast stainless steel, which can withstand higher pressures under high-pressure conditions to ensure stability and safety. The precise rotor clearance can minimize internal leakage, thereby improving volumetric efficiency and maintaining high gas delivery efficiency under high pressure. The high-precision hard toothed gears ensure stable transmission and precise relative positioning of the rotor, maintaining normal operation. The combined sealing mechanism of labyrinth seals and gas seals effectively reduces the leakage of high-pressure gas. For the transportation of flammable, explosive or corrosive gases, mechanical seals can be used to further improve the sealing performance.
The performance parameters of the centrifugal blowers in power plants, such as the 
, inclu
de a pressure range typically ranging from 58.8 kilopascals to 200 kilopascals. Some specially designed high-pressure Rotax blowers can exceed this range to meet the various industrial demands for high-pressure gases. The flow rate is generally between 1 cubic meter per minute and 50 cubic meters per minute, but it decreases as the pressure increases. The power consumption range is from 7.5 kilowatts to 450 kilowatts. Due to the large amount of energy required to compress gas under high pressure conditions, the power consumption is relatively high. The rotational speed is usually between 1000 revolutions per minute and 3000 revolutions per minute, which helps to efficiently convey gases, but higher standards for structure and materials are required.
The cooling methods include air cooling suitable for medium and low pressure conditions (up to 98 kilopascals), where the air is circulated by external fans to dissipate heat. For high-pressure Rotax blowers, water cooling is used, that is, a cooling water jacket is set on the casing or bearing box to allow water to circulate and remove heat, preventing deformation or damage due to high temperature during high-pressure operation, thus ensuring stable and reliable performance.
Zibo Hongcheng Fan Co., Ltd. specializes in manufacturing over 50 series and 600 different specifications and models of axial flow fans, centrifugal fans, mine fans, dust removal fans, boiler fans, etc. These are widely used in industries such as mines, coal mines, oil fields, chemical plants, kilns, metallurgy, boilers, textiles, and building materials. The company can customize production based on the provided drawings. Welcome to negotiate and cooperate.
