A simple and save money into the vertical mill inlet seal method

A simple and save money into the vertical mill inlet seal method is 2020 - 06 - 30 LuanJiangTao 1 LuanChenChen 2 ( 1. China united cement group co. , LTD. , nanyang branch, ascending, henan 474250; 2. Sichuan university, chengdu, sichuan province, 610065) A raw meal grinding, problems of a company for ATOX50 vertical mill, its normal work of the circulating air volume in the 750000 m & sup3; /h。 Existing people feeding belt grinding machine specifications for B1200 & times; At 97000, the head structure and air leakage as shown in figure 1, the wind into the inside of tremie pipe into the ground. The determination of leakage air volume of more than 50000 m & sup3; / h, press -- temperature is 20 ℃, wind circulation temperature is 100 ℃ conversion, leak into the air volume is about 636519 m & sup3; / h, accounts for about 10% of the total air volume. Leakage air volume big not only affects the speed of roller mill at nozzle ring, also increases the vertical mill circulation fan and tail exhaust fan power consumption. Second, the solution to the problem of vertical mill material inlet air leakage various cement enterprise sealing method is the following kinds: one is to use back to machine; The second is to use three flap valve; Three is bin and plate feeder. The above three methods common disadvantage is that the extra power consumption, large investment, high failure rate. The company used to machine back, also used a three way valve, but were abandoned in the due to the high failure rate. In order to solve this situation, the company has adopted a sealing method of the power steps are as follows: ( 1) Adjust the belt roller, roller or add block under the roller, as shown in figure 2, to ensure that the belt conveyor belt and without material runtime control position and level up and down and stop when the belt position does not change, ready to increase the sealing, reduce wear belt to seal, prolong service life. （ 2) Increased because of the belt conveyor roller seal effect, so to extend the original belt head cover, a new belt head cover, as shown in figure 3. （ 3) Under the belt, belt and on the top of the belt, and between the belt and do with Angle steel skeleton seal between the floor, and then made on the rigid plate under rigid seal in the seal plate, plate, rigid sealing plate, above the seal plate distance on the belt, the belt about 50 mm, just in case the seal plate scratch fluctuation belt, as shown in figure 4. （ 4) Between the fluctuation belt and rigid seal plate made flexible seal (old conveyor belt As shown in figure 5 a) , flexible seal ( As shown in figure 5 b) , flexible seal, with fixed jaw, bolt, nut, installed in a position shown in figure 6, after transforming the local images as shown in figure 7. The transformation method is not only the implementation of the method is simple and less investment. After transforming is not affect the running belt and block the wind into the vertical mill. Three, before and after the revamping effect about 13 a circulation fan current drop, power consumption reduced 118 KWH per hour. Every year on 240 d, electricity price by 0. 52 yuan/kWh calculation, 35 years benefit. 3. 43 million yuan. Source: 'cement' in 2019