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To what size are the particles ground for an economic balance between heat transfer rate from combustion gases plus residence time?

To what size are the particles ground for an economic balance between heat transfer rate from combustion gases plus residence time? Correct Answer 200 mesh

The particle size range of 200 mesh was found to be an economic balance between heat transfer rate from combustion gases plus residence time, as dictated by rate of fall of particles, tower height, and grinding costs.

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