3. The fire bridge is constructed of
refractory bricks, and the majority of the grate bars are filled in
with brick. The few free bars permit of the firing of the boiler and
of access of air to the interior of the fire box. Under such
circumstances, the combustion is very regular, the furnace does not
roar, and the smoke-consuming qualities are perfect.
[Illustration: FIG. 3--APPLICATION OF THE BURNER TO A RETURN FLAME
BOILER.]
In the experiment on the Flamboyante, the boiler was provided with but
one apparatus, and the grate remained covered with a layer of ignited
coal that had been used for firing up in order to obtain the necessary
pressure of steam to set the vaporizer in operation. This ignited coal
appeared to very advantageously replace the refractory bricks, the
role of which it exactly fulfilled. It has been found well, moreover,
to break the flames by a few piles of bricks in the furnace, in order
to obtain as intimate a mixture as possible of the inflammable gases.
It is to be remarked that firing up in order to obtain the necessary
steam at first is a drawback that might be surmounted by using at the
beginning of the operation a very small auxiliary boiler. The main
furnace would then be fired by means of say a wad of cotton.
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