The use of the program, the cheapest price, when the dust content is less than Zoomg/111, can guarantee the life of the impeller is 8000 hours, so it is widely used in the power plant induced draft fan; the price of the scheme 1 is the highest, more than twice the scheme W, but The life of the impeller has been greatly improved (4 to n times); the program class, compared with the program n in the life of the impeller, is not much different. The author believes that the scheme 8 is more economical and reasonable.
Test and verification. In 1998, the welding experts of Faodi Company of Germany conducted technical exchanges with the relevant engineering technicians and welding technicians of the factory and the welding test. The test results show that the V29 groove welding rod is beautiful and splashed. Small, VloP3 surfacing electrode has small splash, very small welding skin and high hardness. Based on the above analysis, Faodi anti-wear plate has good anti-wear performance, simple and feasible process, although the price is higher, but compared with the multiple of the life of the pulverized coal fan, the economic benefit is obvious, and it can be more dusty. Popularization and application in pulverized coal blowers.
WISCO's own power plant originally selected our factory Mg-2617. SD pulverized coal blower, after more than 8,000 hours of actual operation, due to high system content and high hardness, it has worn through 3 impellers, which causes great obstacles to the actual production of users, so it must be modified. After on-site observation, the rear straight blade impeller was selected, and the anti-wear plate was added by the lining method. After more than one year of investment, no serious wear problems have been found. With the continuous development of social production, people's requirements for the environment are getting higher and higher. The leakage of pulverized coal blowers is also a problem that cannot be ignored.
Here are three simple and feasible leak prevention measures.
(1) A blade is attached to the back surface of the impeller rear wheel to generate a negative pressure to form an axial seal. The number of attached blades is generally 6 or 8.
(2) Flange surface sealing, welding a ring to the flange joint of the air inlet and the rear cover, and winding the asbestos rope between the two mating rings.
(3) Design a shaft sealing device with a good sealing effect. The shaft seal is formed by a split hard hard asbestos board and a split 16Mn steel plate 90, forming a sealing unit, a plurality of sealing units are stacked together, bolted to form a shaft seal group, and finally locked by a shaft seal cover. On the side panel of the casing, the inner diameter of the asbestos board is exactly matched with the shaft, and the inner diameter of the steel plate is larger than the shaft diameter. The MF-13R180SW, MF-AR160D, MF-BR205D and other pulverized coal blowers designed and manufactured by our factory adopt Fawdi anti-wear plate anti-wear to make the life of the impeller doubled. The above three methods are used to prevent leakage and successfully solve the leakage problem. After the use of the investment, it worked well and was well received by users.
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