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The dryer machine has been mainly used for drying materials with some humidity and granularity in the fields such as ore dressing, building materials, metallurgy, chemical industry, etc. The rotary dryer is highly adaptable to materials. Due to its easy and reliable operation, it is widely used.
Dry materials can be divided into natural drying or artificial drying. Natural drying refers to the wet materials pile up in a hut or outdoor for drying depends on wind or sun. The advantage of this method is without special equipment, and also doesn"t need fuel; however, the drying speed of rotary drying machine is low, output is low, the labor intensity is high, operation condition is poor, and is also easily affected by climate. Artificial drying is to put the materials into the special drying equipment for drying. In artifical drying, there are a lot of methods for heat transfer, such as by use of hot air or the convection of hot flue gas, also can by use of infrared lamp or hot metal, ceramica, refractory materials"s surface radiation heat tranfer.
The operation of rotary drum dryer can carry on with crushing, powder-selecting simultaneously, and currently the pulverized coal equipments of cement plants mostly adopt drying and grinding system. This method can simplify the process, reduce heat consumption, but if the original moisture content of materials exceed the rated scope of drying and grinding system, it still needs another drying equipment for drying in advance.
By using of convection of hot air or hot flue gas for drying is called convection drying method, and the hot air or hot flue gas is called drying medium. According to the characteristics of cement industrial materials, it is widely used convection drying method. The advantages of this method are easy to get heat source, the equipment is simple, and the total fee id also low. In drying process, hot air or hot flue gas transfer the heat to materials, so that make the moisture evaporate, and at the same time depend on the effect of ventilation equipment make the drying medium constantly update to eliminate the moisture. Drying equipment is also in various kinds of types, and commonly used in cement industry are rotary dryer, cement rotating dryer, mixing type dryer, etc. At home and abroad in recent years is also working on spray dryer. All of these equipmens adopt hot flue gas for convection drying.
All in all, drying process is one of the basic thermal processes in cement industry. The stand or fall of drying process directly affect the quality of cement production, so cement workers should give enough attention to drying equipments.
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Rotary kiln can be divided into cement rotary kiln, calcinating rotary kiln and circumgyrate kiln according to different processing materials. Rotary kiln equipment is mainly used for calcining cement clinker, with dry process production and wet process production two kinds. Any mechanical mining equipment are the same, there will need maintenance and renovations, so that it can only guarantee the equipment"s efficiency and ability, to ensure the life of the equipment. The same is true of cement rotary kiln, cement rotary kiln maintenance of the following is the basic requirements and rules:
1. cement kiln maintenance including play bark, split tiles, cleaning, and masonry. In order to shorten the time to stop the kiln, rotary cement kiln is generally 10-12 hours after cooling the skin and the demolition of brick kiln fight, when the kiln temperature will still be above 90?, so playing the skin and split brick kiln at high temperatures are high dust environment.
2. The demolition of horizontal kilns and playing through the skin to be broken hydraulic breaker, there is the inevitable splashing and jumping kiln slag skin collapse of the case, in order to prevent safety accidents, the operator hopes to stay away from work surface do not sit on the machine can not be fixed to avoid.
3. The impact by the circumgyrate kiln door size, generally narrower than the bridge, cross the bridge by the machine from the grate cooler is best VIP car separation. Caused by a small excavator driving vehicles through the bridge fall into the grate cooler accidents have been reported at home and abroad.
4. In order to enter the smaller revolving kiln door, but do not want the kiln hood for additional reform, asked to play the width and height of the brick is smaller, lighter. At the same time the impact of hydraulic breaker to a large power to quickly complete the job, but also to play moving kiln castable.
5. According to common sense, generally do not want diesel-powered equipment in the dust under the conditions of high temperature and high use, because the engine does not heat, and high dust would lay dead air filter and radiator, resulting in glitches, affect the playing tiles operations. (firstname.lastname@example.org)
6. of the machine design must be considered in the case of high temperature and high dust and reliable operation, low failure rate, low cost. Therefore, the international common practice is no longer diesel-driven machinery used in the cement rotary kiln to play within the skin split brick.
7. demolition of brick skin to be removed quickly hit brick kilns, but not damage the cylinder. This requires hydraulic hammer impact energy and frequency stepless kiln.
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