What requirements must the components of the 919 high-pressure centrifugal fan used in desulfurization systems meet?

What requirements must the components of the 919 high-pressure centrifugal fan used in desulfurization systems meet?

Typically, the 919 high-pressure centrifugal fan employed in desulfurization systems primarily processes boiler flue gas after dust removal. So, to meet operational requirements, what specifications must the various components of this 919 high-pressure centrifugal fan satisfy? Below is a detailed explanation. First, requirements for the housing of the 919 high-pressure centrifugal fan equipment. Considering the impact of the actual working environment, the housing should be fabricated from steel plate welded construction. Additionally, a short drain pipe with a minimum diameter of 20 millimeters should be installed at the bottom of the casing. A ball valve should be fitted on the pipe, with a nut at the end of the ball valve. Second, the impeller is the key component of the centrifugal fan equipment. Specifically, the blades should be machined from 16Mn high-quality structural steel. The wheel housing material may be cast iron, ensuring smooth and reliable operation with a service life of 8000 hours. Furthermore, the coupling of the 919 high-pressure centrifugal fan must be considered. For this type of fan, coupling transmission is recommended, and the coupling should operate flexibly. Simultaneously, the protective devices must comply with relevant standards. The critical speed of the main shaft should exceed 1.3 times the fan's operating speed. Attention should also be paid to the main shaft bearings of the 919 high-pressure centrifugal fan. It is recommended to use high-temperature resistant 304 bearings. Furthermore, the bearing housing should be made of cast iron, the bearings should be oil-lubricated, and the sealing system should be equipped with a reliable cooling system. Additionally, the fan equipment's regulating damper should be adjustable within a 0 to 90-degree range to accommodate practical operational requirements. Beyond the aforementioned components, consideration should also be given to the centrifugal fan equipment's flanges, lifting bolts, and base. The base of the 919 high-pressure centrifugal fan equipment must possess sufficient rigidity and strength.