Power plant boiler induced draft fan bearing wear field repair technology

Power plant boiler induced draft fan bearing repair technology of 2019 - bit wear scene 04 - 18 [ Abstract 】 Bearing an induced draft fan for boiler are analyzed in this paper the reasons for wear and tear, accordingly puts forward the use of f the blue polymer composite materials for field repair, the results prove that using f the blue repair technology is a good way to solve the problem of bearing wear of induced draft fan for boiler. 【 Keywords 】 The fan shaft wear; Fan; Bearing wear; Induced draft fan for boiler. Scene 1, equipment repair technology introduction of induced draft fan is an important auxiliary equipment of thermal power plant boiler combustion system ( See figure 1) Drive system is mainly composed of motor, reducer, bearing box, fan of housing, impeller, shaft and its main effect is protecting produces after the boiler fuel burning into the atmosphere. 2, boiler induced draft fan axis wear 2 at the site of the problem. 1 boiler induced draft fan for boiler induced draft fan bearing abrasion of a certain power companies bearing wear condition, the fan speed 780 r/min, bearing adopts single double disk bearing assembly, bearing a diameter & phi; A width of 120 mm 190 mm, bearing, wear for unilateral 0. 3mm。 2. 2 equipment problem analysis axial wear problem is normally caused by the characteristics of metal materials, metal high hardness, but concession sex difference ( Cannot recover after a deformation) , low shock resistance, fatigue resistance performance is poor, so easy to cause adhesion wear, abrasive wear, fatigue wear and fretting wear, most of the axial wear problem during incipient imperceptible, only a machine high temperature, bouncing, such as sound, most of the shaft has been badly worn, resulting in equipment was forced to stop. 2. Bearing wear of induced draft fan for boiler 3 site repair process 2. 3. 1 tradition for axial and inner hole wear problem is after removal to shaft repair workshop for repair welding, set shaft sleeve, such as processing, repair welding machining process itself is easy to make shaft surface local produce thermal stress, cause the hidden trouble of the broken shaft, repair welding and machining process need to spend a lot of manpower and time to disassembly, transport and installation of equipment, the repair time is longer, the comprehensive repair cost is high. 2. 3. 2 f the blue polymer composite materials to repair process. Use of polymer composite materials together with the bearing an original datum plane in the scene to repair worn parts, worn parts used for unworn as locating surface and feet with steel plates ( Blade feet) After the completion of the coating material, curing can guarantee after repair of bearing concentricity and size. 2. 4 boiler induced draft fan bearing wear 2 at the site of the problem. 4. 1 will wear position baked oil processing in the first place, remove oil seep into the metal microporous; 2. 4. 2 use sand paper burnish of wear position for processing, using alcohol or acetone clean. 2. 4. 3 proportionally mixed 2211 f materials and stir evenly until there is no color difference. 2. 4. 4 USES 2211 f materials will wear position filled and slightly bigger than the wear volume. 2. 4. 5 use steel ruler along the datum to grind material, scrape excess material; 2. 4. Waiting for the material curing; 2. 4. 5 material micrometer is used to measure the size of composite curing is complete, with sand paper burnish coarsening surface; 2. 4. 6 again to reconcile daub appropriate materials, assembling bearings, lock, lock nut. 2. 5 boiler induced draft fan bearing abrasion problem of the 3 at the site, the conclusion through the induced draft fan for boiler for power plants bearing wear problem of on-site repair, proved that the use of f the blue polymer composite materials tie-in reasonable repair technology can effectively solve the problem of equipment transmission parts wear at the scene. Also verified the f the blue field repair process has high repair precision, good satisfy the requirement of the equipment precision, the repair link under the premise of accurate control, can reach the use effect of the traditional off-line repair machining.