Abstract
Abstract This paper is based on investigations conducted at the Pittsburgh Experiment Station of the U. S. Bureau of Mines. It shows that in underfeed burning the factor of rate of ignition is much more important than it is in overfeed fuel beds and that it fixes limits to the outputs that can be obtained. It uses the principles determined from the experimental results to interpret the much more complex action in fuel beds of commercial underfeed stokers. It also shows what effect preheated air has on overfeed and underfeed fuel beds and how this preheat is utilized. The results from burning a number of fuels on the underfeed principle, both without and with preheat, are given. The variables investigated were kind and size of fuel and rate and temperature of the air supplied.
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