Improvement of preheater exhaust fan bearing box of oil spill

Preheater exhaust fan bearing housing renovation in 2020 - of the spill 04 - 08 jin-liang zhao hao too kun Jiang Chao ( Xinxiang plain tongli cement co. , LTD. ) 0 quote a firm & Phi; 4. 8× 74 m preheater waste gas processing system of rotary kiln, configure an exhaust fan, exhaust gas model for Y4 - 2x73№27. 5 f, air volume of 960000 m & sup3; / h, the impact pressure of 3800 pa, blast temperature 200 ℃. The fan is the main function of the vertical mill system fan discharge of hot air preheater high temperature of waste gas discharge and away, to meet the clinker calcinations, and waste heat power generation technology requirements of raw material grinding. Began in March 2013 of the fan bearing seal oil leakage phenomenon, with the fan running, lubricating oil leakage phenomenon aggravate gradually. To 2014, bearing box lubricating oil spill has affected the stable operation of the fan, cause accident stopped kiln; Need to add lubricating oil regularly shift inspection personnel at the same time, maintain the normal oil level of lubricating oil to ensure fan lubrication effect, cause a large amount of waste lubricating oil. 1 the reason analysis of bearing adopts the straight-through labyrinth seal of tooth profile of the fan. Its principle is straight-through labyrinth tooth seal tortuous channels be made into various shapes. By increasing the lubricating oil flow of local kinetic energy loss to reduce the leakage of lubricating oil. Lubricating oil from the high side, with extremely high velocity flow through the throttle narrow gap again into the labyrinth cavity expansion. After that, the fluid with a strong vortex in the cavity, the energy dissipation, thus reducing pressure, forming the kinetic energy of the fluid flowing through the narrow gap in consumption. Before sealing teeth into the next part of kinetic energy into pressure, raising the pressure slightly. Then, the fluid into the next sealed teeth, a beam shrinkage again. So circulation, make the pressure stepped down, after a lot of throttling expansion and resistance, prevent leakage of fluid to the outside, in order to achieve the purpose of sealing [ 1] 。 Through analysis of professional and technical personnel, think cause of oil bearing of the fan is the fan running for a long time, ( Stop from firing up to normal production and check material kiln process, take up to several months of the fan run 24 h a day) The normal wear and tear, sealed bearing box by repeated, overhauling seal deformation, and increase the gap between the rotor and the seal bad, cause oil leakage. 2 improvements due to the seal of bearing box labyrinth alloy materials easy deformation and cannot adjust, after the discussion of the professional and technical personnel, decided in bearing box near the shaft seal add a split type oil baffle plate ( As shown in figure 1, figure 2, figure 3) 。 New split type oil baffle plate is installed on the bearing from bearing between the inner and outer skeleton seal in the 5 mm, thickness is 3 mm, oil pan diameter smaller than gland inside diameter 50 mm, sleeve elongation is 15 mm, evenly around the socket drill & Phi; 6 mm threaded hole, number of 4, use the top silk and shaft fixed. New split type oil baffle plate can indirectly isolation and sealing effect of sealing, lubricating oil flow smoothly back to inside body, prevent the bearing and shaft oil seal leakage. Split type oil baffle plate structure is simple, easy processing, low cost, remove the implementation simple installation. 3 use effect after modification, the actual production of two years, the stability of the fan operation, use effect is very good, can effectively avoid bearing box lubricating oil spill. Put an end to a lot of waste lubricating oil, not only save a lot of maintenance funds for the company, and effectively safeguard the production run smoothly, greatly improve the operation rate of kiln system, transformation was a success. References: 1] Highlights of San Francisco. Labyrinth seal performance influence factor analysis [ J] 。 Fan technology, 1997 ( 6) : 17 - 21. Source: 'China cement'