Three technological transformation and its effect

Three technological transformation and its effect is 2020 - 06 - 20 ChanShaoRen wei-hua song Du Lian ({sang pu} lei reed left column Anyang China united cement co. , LTD. , henan anyang 455133). A, 1 preheater boiler back to grey system of technology improvement. One of the original system and existing problems of a company's 5000 t/d NSP cement clinker production line preheater boiler feed back by the gate, the grey system, expansion joint and the screw conveyor 1 ( Specifications GLS500 & times; 7650). And screw conveyor (2 Specifications GLS500 & times; 9500). ( See figure 1) Collection of kiln, boiler ash by means of this system to the humidifying tower to send grey with chain conveyor ( Specifications FU350 & times; 21500). , was eventually to homogenize the library. Figure 1, the screw conveyor is rolling bearings on both ends of the 1, 2, middle has a set of crane, belong to the three support, is not easy to find, easy to cause reamer rotating torque caused by the additional force is bigger, so the screw conveyor in the use of frequent accidents, maintenance workload is bigger, and affect the normal production and operation of the system. 1. 2 improvement and its effect in order to solve the insufficiency of the above system, first of all to dismantle the screw conveyor 1, 2 and discharge valve; Will FU350x21500 lengthened 9400 mm chain conveyor, make the original feed opening extends to the boiler ash hopper side below ( 22 original 11 kw motor power, rated current. 5 a, the measured current 12 a, lengthen after review can meet the requirements) ； Between the boiler ash hopper and FU chain conveyor feed valve is directly connected with. The improved system in figure 2. After the improvement, one can reduce the consumption of equipment and spare parts, two can reduce equipment maintenance workload, thus can reduce the effect the normal production of the system; 3 it is to save 1 5. 5 kw screw conveyor 1 and 7. 5 kw screw conveyor 2, which can save electricity 6 every year. 10000 yuan. Second, the vertical mill circulation fan shaft end sealing improvement 2. Analyzes the problems and causes of 1 a company of new dry process cement clinker production line, the raw meal grinding cycle fan ( Model SL6 - 2× 39 - 10No31F) Inlet box chassis of the main shaft through, design of floating seal to prevent gas leakage ( See figure 3) 。 Its seal principle: in the fan casing thermal expansion after the can can, at any time and spindle together, good sealing effect. The floating seal by the three pieces of steel spacer ring and 2 pieces can be connected with the sealing ring with four bolts, looping floating seal on the shaft, steel spacer ring of floating seal and spindle has a 5 mm gap, and the sealing ring made of asbestos rubber sheet in contact with the spindle no gap. Spindle operation, floating seal just floating around the main shaft and not with the spindle rotation, the results of the new change of the sealing ring is wear a few days, and then makes contact steel spacer ring spindle and wear and tear, floating seal the clearance between the spindle and increase over time, until the bolt contact casing floating seal or cover plate makes the floating seal don't touch the spindle. At this point about 20 mm to the clearance between the shaft and sealing, resulting in the fan air leakage. Considering quick wear of asbestos rubber sheet, asbestos rubber sheet is first to aluminum sheet, but after using half moon floating seal the clearance between the spindle and up to 20 mm or so. Analysis, floating seal contact with the shaft friction is the fundamental reasons of quick wear of seal and air leakage. The seal structure is improved, therefore, is to address the root of the problem. 2. 2 the improvement and the effect of sealing cover plate and floating seal are removed with 10 mm thick steel plate processing into a sealing cover ( Its outer diameter size in order to cover the original four hole on the chassis) , sealing cover and spindle 2 mm gap, as shown in figure 4. Hermetic seal cutting into symmetrical two and a half after welding on the fan casing, and ensure the cutting in welding no air leakage. After the improvement, the sealing cover do not contact with the spindle, no mechanical wear, just system caused by the negative pressure air leakage caused by very small amounts of very slight wear, use effect is good. Three, grate cooler high-speed fan bearing life short to deal with a company of 5000 t/d cement production line grate cooler is equipped with high-speed fan, a total of 5, since January 2011 and put into production, this is common 5 high-speed fan bearing ( For self-aligning ball bearings, model 2316) The phenomenon of short service life. According to the production of initial stage 1. 5 years of statistics, high-speed fan bearing life just a month, shortest 6 months the longest. As 5 high-speed fan air volume, air pressure and motor power is a little difference, speed is 2900 r/min. Fan bearing temperature, noise and vibration when using normal; Once check the bearing abnormal sound, usually maintains a fracture, but the normal bearing clearance, temperature and vibration are slim. Analysis, bearing life short is caused its bearing capacity is low. Therefore change a bigger bearing capacity, is the key to solve the problem. After investigation and research, decided to adopt the same size shape of alternative type 2316 type 22316 spherical roller bearing self-aligning ball bearing. The type 22316 compared with the performance of 2316 bearing, self-aligning roller bearing are shown in table 1. The table 1 shows that 22316 bearing capacity is 3 times more than 2316 bearing, bearing capacity after replacement must can meet the environmental requirements; But its theoretical limit speed 2600 r/min under using speed 2900 r/min, possible problems in the operation of the bearing is easy fever, so need to consider the appropriate cooling problem. To contact the manufacturer, change bearing to 22316 after the water cooling. In August 2012 to 1 fan bearing from 2316 to 22316, to replace the fan shaft and bearing and bearing seat, bearing seat with circulating water cooling bearing. Change since nearly 2 years, fan operation is normal, when stop check bearing is good. This suggests that the grate cooler fan bearing life short the cause analysis, right treatment measures are feasible. Source: 'cement project' 2015 no. 2