IMPROVEMENTS IN AND RELATING TO STEAM BOILER FURNACES FOR BURNING PULVERIZED OR POWDERED FUEL
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Jacob Jones Storer at the Office of the
Commissioners of Patents on the 22nd June 1877.
JACOB JONES STORER, of the City and State of New York, United States of
America, now of S, Southampton Buildings, London. "IMPROVEMENTS IN AND
RELATING TO STEAM BOILER FURNACES FOR BURNING PULVERIZED OR POWDERED
FUEL."
This Invention relates to improvements in the construction of the furnaces, fire-
boxes, or fire-places of locomotive and other boilers for the effective and economical
combustion of pulverized or powdered fuel.
When pulverized fuel is employed for the generation of steam in boilers set or
arranged in the ordinary manner the rapid absorption of heat by the boiler surfaces
prevents the complete combustion of the fuel and gases coming in contact with
them, consequently it is necessary for the complete combustion of the pulverized
fuel that radiating rather than absorbing surfaces should surround the jet of fuel as
it is injected into the fire-box, and that these surfaces should be of sufficient extent
to accomplish the end in view. Therefore in the case of boilers of the locomotive
class, I line, or partially line, the fire-box with a slow absorbent of heat, such as fire-
brick; or in some instances I build within the fire-box two side walls supporting an
arched roof, and in the front of the said fire-box I make an opening for the injection
of the pulverized fuel.
In ordinary plain tubular or flue boilers I reduce the usual grate surface to about
one-fourth of its area; that is to say, I make this surface of the usual length but
reduce its width. The sides of the fire-place are brought in at the bottom to the
width of the grate, and are made to slope upward and outward to the diameter of
the boiler. These sides support a solid arch or roof, which is built as closely as
practicable to the crown sheet of the boiler, and extends from the front of the fire-
place to the rear, and in some instances beyond the rear of the said fire-place.
In the boiler front, about six inches above the fire surface, I make an opening
for the injection of the pulverized or powdered fuel.
When powdered fuel is employed in short flue or tubular boilers, or particularly
when the same have a powerful draught, a considerable portion of the fine ashes of

page_text: the fuel will be carried along under the boiler into the tubes or flues, and will lodge
therein and prevent the proper transmission of the heat from the gases unless some
provision is made to prevent their accumulation. To obviate this difficulty I place
in the flame chamber under the boiler a cross piece or arch, or two or more of the
same, formed of refractory material, which will interrupt the course of the current
and throw down the ashes, or a large proportion of them, thereby preventing their
entrance into the tubes or flues. And the combination of the said cross pieces or
arches with the above described construction of the furnace is the essential feature
of my Invention.
In boilers having a flue or flues in which the fire is placed I line the fire-flue or
flues for a portion of the length thereof with fire-brick, and introduce the pulverized
fuel through an opening made in the flue front.