Improvements applicable to Steam Boiler Furnaces.
Year: 1896

page_text: Date of Application, 6th Feb., 1896
Complete Specification Left, 12th Oct., 1898-Accepted, 12th Dec., 1896
PROVI NAL
Improvements applicable to Steam Boiler Furnaces.
I JOSEPH ELI CRYER of Waterside Iron Works, Dukinfield in the County of
Chester, Machinist, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements applicable to the furnaces of steam
boilers, the object of the invention being to admit a supply of highly heated air at
or behind the bridge, or at any other convenient part or parts of the furnace, so as
to entirely consume the gases evolved from the fuel and thus to prevent smoke ant
economize fuel.
For the purposes of my invention I construct or fix in the back flue at the hack
end of the boiler an air heating chamber which may be of fire brick or other
suitable material.
Cold atmospheric air is admitted to this chamber (preferably at its lower part)
by means of a tube or tubes passing either from the front of the boiler along the
bottom flue beneath the boiler to the said chamber, or the air may be admitted to
the latter from the back or sides if preferred.
The waste heat from the furnace passing along the flue or flues will raise the
walls of the said chamber to a great heat, and the air therein will be raised to a
high temperature.
A pipe or pipes from the upper part of this chamber will convey the air thus
heated back along the main flue to a space or chamber in the bridge of the
furnace, whence it will be distributed through perforations into the furnace; (or
the heated air may be admitted to the furnace at other parts, say beneath the fire
bars).
This highly heated air mingling with the smoke and gases therein without
lowering their temperature, will cause the same to be entirely consumed, and thus
effect the desired results of complete combustion, absence of smoke and gases, and
economy of fuel.
1000
Improvements applicable to Steam Boiler Furnaces.
I JOSEPH ELI CRYER, of Waterside Iron Works, Dukinfield in the County of
Chester, Machinist, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
This invention relates to improvements applicable to the furnaces of steam
boilers, the object of the invention being to admit a supply of highly heated air at

page_text: or behind the bridge, or at any other convenient part or parts, of the furnace, so as
to entirely consume the gases evolved from the fuel and thus to prevent smoke and
tu economize fuel.
The manner of carrying my invention into practical effect will be readily
understood on reference to the annexed two sheets of drawings and the following
explanation thereof.
Sheet 1 of the drawings illustrates one modification of my invention wherein the
highly heated air is introduced into the furnace at the bridge, and Sheet 2
illustrates a modification of the same wherein the highly heated air is introduced
below the fire bars in the ashpit.
Referring to Sheet 1 of the drawings,
Fig. 1 is a longitudinal section through the furnace and flue of a boiler,
Fig. 2 is an end view, and
Figs. 3 and 4 are detached side and face views, on a larger scale, of the air
heating apparatus hereinafter more particularly referred to.
On Sheet 2 of the drawings Figs. 5, 6, 7 and 8 are similar views of the other
modification above mentioned.
a the boiler, the internal flues and c the fire bars, d is the bridge.
For the purposes of my invention I construct or fix in the back fue e at the back
end of the boiler a an air heating chamber which may be of fire brick or other
suitable material, say, cast iron as shown at Figs. 1, 3, 4, 5, 7, and 8.
Cold atmospheric air is admitted to this chamber f (preferably at its lower part)
by means of a tube g admitting the external atmosphere from above (as shown)
or from the back or sides or front of the boiler a as may be preferred. The waste
heat from the furnace passing along the flue or flues will raise the walls of the
said chamber f to a great heat, and the air therein will be raised to a high
temperature.
A pipe (or pipes) from the upper part of this chamber will convey the air thus
heated back again along the main flue or flues b into a space or chamber i in the
bridge of the furnace, whence it will be distributed through perforations k into
the furnace (as shown at Fig. 1) or the heated air may be admitted to the furnace
at other suitable parts, for example beneath the fire bars as shown at Fig. 5 and
in some cases I may find it advisable to create a forced draught in the pipe h by
means of a fan or blower as shown at Figs. 5 and 6.
This highly heated air mingling with the smoke and gases in the furnace
without lowering their temperature will cause the same to be entirely consumed
and thus effect the desired results of complete combustion, absence of smoke and
gases, and economy of fuel.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The combination with a boiler furnace of an air beating chamber constructed
or fixed in the back flue .at the back end of the boiler, with means for admitting
cold atmospheric air into the said chamber, and a pipe or pipes for conveying
the heated air from the said, chamber back through a pipe or pipes extending
along the internal flue or flues to the front, and distributing the same into the
furnace at or near the bridge, or beneath the fire bars, or at any other convenient
and suitable part thereof, substantially as hereinbefore described and illustrated
by the drawings annexed."
Dated this 7th day of October 1896.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.