Reform and benefit of dryer in cement process Henan Hongxing


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Improvement and benefit of dryer in cement process

A 2500t / D new dry process production line has been used dryer At the beginning of the production line, the system output is 2500 ~ 2600t / D, the dryer operates normally and the drying is also very good. However, in recent years, the output of kiln system has been greatly improved, especially when the system output exceeds 2800t / D, the shortage and defects of dryer are gradually highlighted, which become the bottleneck restricting further production and affecting safety production.


1. Problems

(1) If the drying is not good, the temperature of clinker out of the dryer is as high as 200 ~ 260 ℃, the heat carried away by clinker and residual air is high, and the heat consumption increases;

(2) Because the clinker temperature is too high for a long time, affected by the kiln segregation, the fine material side cylinder appears thermal deformation, coupled with the wear of supporting wheel and guide wheel, resulting in the drum deviation phenomenon;

(3) The gap is too large and the leakage is serious during operation, which brings hidden danger to the safe operation of the equipment;

(4) Due to the high temperature of clinker, the service life of crusher hammer and clinker conveyor belt is shortened, and the output of subsequent cement grinding system is affected;

(5) The phenomenon of "Red River" often appears on the fine material side, and the baffle plate on the side is seriously worn and has short service life.

2. Transformation

In view of the problems existing in the dryer, the factory decided to The dryer was reformed To improve the heat recovery efficiency, improve the drying, and eliminate the hidden trouble of equipment failure.

(1) Three ways to improve the air distribution of the air dryer are to increase the air volume distribution and to increase the air volume distribution.

(2) High temperature zone has large temperature difference and good heat exchange. Increasing air volume here can improve drying and enhance heat recovery. However, it should be noted that hot air should not be mixed too much, otherwise it will reduce the temperature of secondary and tertiary air, and even affect the calcination of kiln system.

(3) The change of drying mode is to change the air supply from air chamber to fan in high temperature area, so as to achieve forced drying. But the fan should not be increased too much, otherwise it will lead to the increase of power consumption. At the same time, attention should be paid to the matching of wind pressure between fan and air chamber.

(4) Increasing the contact area of bulk materials is a direct and effective way to improve equipment performance.


3. Benefit analysis

(1) Increase clinker output by 2.5 ~ 3.0 T / h;

(2) The power consumption of clinker is (62.5 × 2750 + 365) / 2810 = 61.3kwh/t, which is decreased by 1.2kwh/t compared with that before transformation. The annual operation rate is 300D and the annual electricity cost is saved by 60.7;

(3) Before the technical transformation, the heat-resistant belt needs 700m per year, and after the transformation, it only needs about 200m, saving 15%;

(4) Because the clinker is well dried and grindability is improved, the output of cement mill is increased by 5 ~ 10t / h;

(5) After the technical transformation, there is almost no leakage of material in the pit of dryer, and the labor cost is reduced by about 5 every year;

(6) The actual coal consumption of clinker is reduced by 3 ~ 5kg / T, and the raw coal is calculated as 800 yuan / T, saving 269.8 yuan of raw coal cost every year.

After the problems of dryer are reformed, the output is increased, the drying is improved and the failure rate is reduced. This transformation makes the output of the cement mill improved, and brought considerable economic benefits for the manufacturers. If so, Welcome to consult Red Star machine

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