High temperature fan bearing high temperature treatment measures

High temperature fan bearing temperature high 2020 - processing measures 03 - 12 Du Lian Jin Hongbo ChanShaoRen ( Anyang China united cement co. , LTD. , henan anyang 455133). 1 problem describe my company 5000 t/d clinker production line for saving energy and reducing consumption, the high temperature fan (fan replacement for high efficiency and energy saving Model RCCF844AZ / 1633) 。 Fan using new wears tube cooler (including Model GLC1 - 0. 8/0. 6) The thin oil terminal ( Model XYZ - 25页) And the return pipe of the original fan bearing lubrication equipment. At the same time the new bearing used is at the bottom of the original base foundation, so the original dilute oil terminal equipment and the position and return pipe can keep unchanged. During normal production, bearing temperature is higher, the temperature of 19 ℃, fixed end temperature up to 68. 8 ℃, the free end up to 63. 2 ℃, beyond the bearing temperature rise & le; The normal range of 40 ℃, the shaft seal and bearing box in the continuous oil leakage phenomenon. If the summer temperatures of 35 to 40 ℃, most likely because of bearing high temperature fan protection alarm trigger or jump stop, 75 ℃ alarm, 80 ℃ jump stop) 。 Root cause analysis (2 1) Preliminary observation, because the new fan shell increases, the original dilute oil terminal of the return pipe from the new fan shell only 20 mm ( See figure 1) 。 Due to the high temperature fan shell temperature as high as 130 ~ 140 ℃, close baking oil absorb a lot of calories, lead to dilute gas station, oil temperature reached 51. 6℃、56. 3 ℃, the temperature difference is less than 5 ℃, and then the influence on bearing cooling effect. Figure 1 illustrates the original dilute oil terminal return pipe layout ( 2) Further observation, 2 5/6 bearing oil tank oil level achieved target, high oil level besides the impact bearing cooling, also makes the oil for bearing splash, gathered at the shaft seal increases the possibility of a leak. Post personnel pass the small thin oil terminal on the flowline flow control valve to reduce bearing box feed flow rate, so back though oil level and the oil temperature was about 3 ℃ higher than the previous, bearing temperature barely moved, the measures to little effect. Three solutions ( 1) Adjust the position of the return pipe to make it to the high temperature fan shell range increased from 20 mm to 300 mm, at the same time by adding a layer along the direction of high temperature fan shell made of caigang watts parcel rock wool insulation board ( See figure 2) So that we can for the tubing and thin oil terminal block most of the heat from the fan. Figure 2 with heat insulation board in the high temperature fan at the bottom of the shell ( 2) From bearing box to dilute gas station main return pipe between the oil return pipe diameter by original DN25mm for DN32mm ( See figure 2) 。 The larger diameter reduced oil in pipe flow resistance, improve the bearing box oil return flow, achieve the goal of lower oil level. 4 the effect after transforming in fan during normal operation, observation 2 bearing box oil level back to the oil standard between 1/2 to 2/3, oil leakage phenomenon disappeared. Fixed end bearing temperature drop to 50. 4 ~ 55. 1 ℃, the free end bearing temperature drop to 46. 8 ~ 52. 7 ℃, thin oil station, back to the oil temperature down to 36 respectively. 6℃、47. 2 ℃, fan operation stability, explain the cause analysis and solution measures are correct. Source: 'cement' 11, 2018