20/03/2014 Other Machines
The rotary kiln is usually turned by means of a single Girth Gear surrounding a cooler part of the kiln tube, but sometimes it is turned by driven rollers. The gear is connected through a gear train to a variable-speed electric motor. This must have high starting torque in order to start the rotary kiln with a large eccentric load. A 6 x 60 m rotary kiln requires around 800 kW to turn at 3 rpm. The speed of material flow through the rotary kiln is proportional to rotation speed, and so a variable speed drive is needed in order to control this. When driving through rollers, hydraulic drives may be used. These have the advantage of developing extremely high torque. In many processes, it is dangerous to allow a hot rotary kiln to stand still if the drive power fails. Temperature differences between the top and bottom of the rotary kiln may cause the rotary kiln to warp, and refractory is damaged. It is therefore normal to provide an auxiliary drive for use during power cuts. This may be a small electric motor with an independent power supply, or a diesel engine. This turns the rotary kiln very slowly, but enough to prevent damage.
The dry crude materials enter the kiln outlet, i.e. the high end of the cylinder through the preheater, and then are fed into the kiln by the tremie pipe. Due to the inclination of the cylinder and slow rotation of the material, the materials roll in hoop direction. On the other hand, the materials move from the high end to the low end, where they are decomposed, burnt, cooled in succession. Thus they become cement clinker, and are discharged from the low end of the cylinder. Finally, they enter the cooling device.
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