Power Required to rotate a Kiln

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Calculating the power required to rotate a horizontal kiln involves considering factors like rolling resistance and the moment caused by off-center weight, although the latter can often be negligible. The kiln's continuous rotation at 4 rpm with a mass of 60,000 kg and a rolling resistance coefficient of 0.005 suggests that energy is needed primarily to overcome rolling resistance. Starting and stopping the kiln introduces significant power requirements, especially during production when it is not allowed to spin freely. It's crucial to account for the effects of off-center mass, which can impact energy needs depending on the load's distribution. Overall, while the kiln may seem to require no power under certain conditions, practical operational factors necessitate careful power calculations.
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Can anyone help me out in calculating the power required to rotate a Horizontal Kiln resting on Rollers of following data:

Kiln Mass 60000 kg
Kiln Length 35 m
Kiln Diameter 2.8 m
Roller Diameter 0.8 m
Radial distance between two centers 1.992m
Kiln Shell Thickness 0.025 m
Speed 4 rpm
Time 180 sec
 
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Some factors to consider:

Acceleration - is it continuously rotating or stopping after each cycle?
Rolling resistance
Moment caused by off-center weight
 
The kiln shell is rotating continuously with tyres resting on support rollers. Rolling resistnace and momnet caused by off-center weight can be considered negligible.
 
snehbiswas said:
The kiln shell is rotating continuously with tyres resting on support rollers. Rolling resistnace and momnet caused by off-center weight can be considered negligible.

That suggests it requires no power! What non-negligible reasons would you have for driving it instead of just letting it spin freely?

Starting and stopping would be significant. Is that what you're concerned with?
 
Rotating kilns for calcining lime, etc, have been around forever. Why not see how they are specced WRT drive capabilities? Off-center materials load is definitely NOT negligible, btw. That is the reason that you have a rotating kiln to mix the feed material, expose it to the heat, and transport it and discharge it at the product end. That all takes energy. The kiln does not rotate freely if it is in production.
 
Consider the rolling resitance coefficient to be 0.005. need help in designing a no-load condition rotating kiln.
 
snehbiswas said:
Consider the rolling resitance coefficient to be 0.005. need help in designing a no-load condition rotating kiln.

So rolling resistance is the only loss of power? That's (more) realistic. But you might also want to consider the inevitable off-center mass present in the kiln itself. That may be negligible, and may depend on tolerances, but you should check just in case.

For rolling resistance, see Wikipedia

For startup, use torque = rotational inertia * angular acceleration.
 

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