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| Product Name: |
Cement Rotary Kiln
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| Related proudcts |
kiln, kaolin rotary kiln, |
| Specifications |
All rotary kilns essentially take the form of beams supported at |
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All rotary kilns essentially take the form of beams supported at a few points - the tyres - along their length, with the added complication that they rotate. The shell has to cope with all the forces involved, but is necessarily thin, since weight must be minimised. The design and maintenance of the kiln need to keep the distortion of the structure within acceptable limits. Flexure as the kiln rotates causes reduction in the life of the refractory lining (see below) as well as fatiguing the shell itself.
A number of different mechanical deformations occur. Diagrams show the nature of the distortion in an exaggerated form.
Bending of the kiln under gravity:
Axial distortion �the tendency of the kiln to sag between two successive tyres (fig. 1)
Transverse distortion (ovality) �the tendency of the kiln to flatten, mainly in the vicinity of the tyre (fig. 2)
Distortion due to damage:
Blistering �usually due to local over-heating (fig. 3)
"Waisting" or "necking" �usually due to the shell expanding beyond the limit of the tyre clearance (fig. 4). This typically happens if the shell temperature rises more than 180°C above design temperature in the vicinity of the tyre.
Banana distortion �usually due to over-heating one side of the kiln during a crash-stop (fig. 5)
Structural defects:
Misalignment �vertical displacement of the rollers from their correct position
Kinks and dog-legs �off-axis defects during assembly or maintenance of the shell
Torsional distortion �the twisting of the shell caused by the torque of the drive �a very minor effect.
Thermal expansion �the kiln shell expands radially and longitudinally. Radial expansion closes up the clearance within the tyre, so reducing ovality. Longitudinal expansion affects the location of the tyres with respect to the rollers and of the ends of the kiln with the hood and exhaust duct. The kiln system, of course, is designed to take up its correct position when operating at design temperature. Since the 1930s kilns have been designed to |
| Company: |
Henan Hongtong Machinery Technology Development Co.Ltd.
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| Contact: |
Mr. Nat Li |
| Address: |
North Section,Yongan Road |
| Postcode: |
451200 |
| Tel: |
86-371-64373900 |
| Fax: |
86-371-64373911 |
| E-mail: |
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