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<p>and refractory is damaged.  Hence, normal practice is to provide an auxiliary drive for use during power cuts.  This may be a small electric motor with an independent power supply, or a <a href="page.php?w=diesel_engine">diesel engine</a>.  This turns the kiln very slowly, but enough to prevent damage.</p>

<p><big>Internal heat exchangers</big></p>
<p>Heat exchange in a rotary kiln may be by <a href="page.php?w=Heat_conduction">conduction</a>, <a href="page.php?w=convection">convection</a> and <a href="page.php?w=thermal_radiation">radiation</a>, in</p><p>
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