Improvements in or connected with Furnaces for Steam Boilers or other purposes.
Year: 1897

page_text: Date of Application, 30th Mar, 1897
Complete Specification Left, 30th Dec., 1897-Accepted, 30th Mar.,
1898
PREDIVNA SITIVATION.
Improvements in or connected with Furnaces for Steam Boilers or
other purposes.
We, WILLIAM SCOBLE MACKENZIE, of The Orchard, Normanton, in the County
of Yorks, Surgeon, and WILLIAM CROSLAND, of Woodthorpe Lane, Milnthorpe,
in the County of Yorks, Engineman, do hereby declare the nature of this invention
to be as follows:
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This invention has for its object to provide means in connection with steam boiler
furnaces or other furnaces whereby increased heating effect is obtained, smoke
and combustible gases are elliciently consumed and fuel is economized.
According to this invention there is provided in the flue or passage by which
the products of combustion pass towards the chimney a perforated fire brick
structure or plate. It is preferably placed in the flue or passage, in the case of a
boiler flue at the end thereof furthest from the fire place or furnace proper and
flush with the end of the boiler. A similarly perforated structure or plate of fire
brick is mounted in a frame or otherwise and provided with means for moving it
so that the perforations therethrough can be made to coincide with the perforations
through the fixed fire brick structure or so that the solid portions of the one close
or partially close the perforations through the other. The moveable part may be
provided with a counterpoise so as to facilitate its operation and by adjusting it
the rate of combustion can be regulated as required. As the products of com-
bustion pass through the perforations of the structures they are very effectually
consumed as the said structures become highly heated and cause the combustion
of the smoke and gases as they pass therethrough at a rate regulated by the
adjustment of the moveable part. A steam jet or steam jets may be employed
in proximity to the said structures preferably on the side farthest from the fire.
Although we have named fire brick the structures may be made of any substance
which will stand the heat.

page_text: Milnthorpe, in the said County of Yorks, Engineman, do hereby declare the nature
of this invention and in what manuer the same is to be performed to be particu-
larly described and ascertained in and by the following statement:-
-
This invention has for its object to provide means in connection with steam boiler
furnaces or other furnaces whereby increased heating effect is obtained, combustible
gases are efficiently consumed, smoke prevented, and fuel economized.
According to this invention there is provided in the flue or passage, by which
the products of combustion pass towards the chimney, a perforated fire brick
structure or plate. It is preferably placed in the flue or passage, in the case of a
boiler flue at the end thereof farthest from the fire place, or furnace proper, and
flush with the end of the boiler as illustrated at A in the accompanying drawings
where Figure 1 is a longitudinal section Figure 2 a vertical section ou the
line 1, 2 Figure 1, and Figure 3 a plan. A similarly perforated structure or
plate B of fire brick is mounted in a frame or otherwise and provided with means
for moving it so that the perforations therethrough can be made to coincide with
the perforations through the fixed fire brick structure or so that the solid portions
of the one close or partially close the perforations through the other. These means
for operating the part B may be of any suitable kind for example the said part B
may be connected by a rod to one arm of a bell-crauk lever e, turning on a centro
on the top of the boiler setting and having its other arm connected to a rod d,
extending to the front of the furnace, and there passing through a nut in the wheel c
so that it may be drawn forward to raise the part B or moved back to lower the
said part B by rotating the wheel e in one or the other direction. Or the part B
may be operated by a rope f passing over pulleys and attached to a device such as
a lever g which can be moved up and down and retained in any position by engag-
ing with the toothed bar has illustrated by Figure 4. The moveable part B may
be provided with a counterpoise so as to facilitate its operation and by adjusting
it the rate of combustion can be regulated as required. As the products of com-
bustion pass through the perforations of the structures A and B, the said products
are very effectually consumed as the said structures become highly heated and
cause the combustion of the gases (and the prevention of smoke) as they puss
therethrough, at a rate regulated by the adjustment of the moveable part.
A steam jet or steam jets may be employed in proximity to the said structures
preferably on the side farthest from the fire. An arrangement for this purpose
is shown as consisting of a steam pipe i supplied with steam from the boiler by
the dome pipe and terminating in a jet or jets at & and provided at / with a valve
by which the passage of steam can be controlled by the ropes or rods m led to the
front of the boiler.
Although we have named fire-brick the structures may be made of any substance
which will stand the heat, and in place of one structure such as A we may use two
or more say one additional structure similar to A situated a few inches nearer
the fire.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is―
1. In combination with furnaces for steam boilers or for other purposes perforated
structures of brick, or other material, one situated in the flue, or passage, by which
the products of combustion pass from the furnace to the chimney and the other
moveably mounted and provided with means for operating so that it can be
caused to obstruct or partially obstruct or leave free the perforations through the
structures, substantially as herein before described.
2. In combination with furnaces for steam boilers or for other purposes, a
perforated structure or structures of brick or other material situated in the flue or
passage by which the products of combustion pass from the furnace to the chimney
and another moveably mounted and provided with means for operating it so that

page_text: it can be caused to obstruct or partially obstruct or leave free the perforations
through the structures, and means for supplying steam in proximity to the said
structures substantially as hereinbefore described.
Dated this 29th day of December 1897.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.