Improvements in Smoke-consuming Apparatus for Steam Boiler and other Furnaces.
Year: 1899

page_text: Date of Application, 21st Feb., 1899-Accepted, 25th Mar., 1899
COMIDEIN DI DUIFICATION.
Improvements in Smoke-consuming Apparatus for Steam Boiler and
other Furnaces.
We, ALEXANDER BEITH HAY, of Maryhill, Manufacturing Chemist, WILLIAM
RENNIE, of 300, Springburn Road, Engineman, and WILLIAM MUI, of Spelter
House, Hutchison Street, Maryhill, Foreman, all in the City of Glasgow, 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 has for its object to provide improved means for ensuring better
combustion of the fuel in steam boiler and other furnaces by consuming or
preventing the formation of smoke therein. For that purpose part of the air
supply to the furnace is led through piping placed in the combustion chamber or
in the furnace walls or flues so as to absorb and transmit heat to the air traversing
the piping and which is delivered either through a hollow perforated bridge or
at the rear of the ordinary bridge to meet and commingle with the fire gases and
thus ensure their complete combustion.
In the accompanying drawings which illustrate the invention, Figure 1 is a
longitudinal vertical section of part of a single flue boiler showing the air heating
arrangement and hollow bridge and Figure 2 is a like view of a modification in
which the ordinary or solid bridge is formed at the rear of the furnace.
The furnace A may be of any ordinary construction but the admission of air
through the fire-grate is preferably regulated by means of doors or air registers in
front of the ash space under the grate. A pipe or pipes B of iron, fire-clay or other
material is or are carried from the boiler front under the fire grate and through
the lower part of the bridge C into the combustion chamber or rear of the flue D
and doubled so as to return through said flue to the rear of the bridge, the return
portion of the piping being of increased diameter to allow for expansion of the
air passing through the piping. The air supply piping B may either terminate
at the rear of the ordinary bridge as indicated at Figure 2, or it may be carried
into the lower rear side of a hollow bridge C as shown at Figure 1, and the air
from the piping delivered through orifices in the upper inclined edge of the bridge
to meet the flame and fire gases passing from the furnace.
A valve E to control the air admission may be fitted on the air pipe B at the
front of the boiler. In the case of marine boiler furnaces or other furnaces having
a short combustion chamber the air supply piping may be coiled in order to
present sufficient heating surface.
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:-
In boiler or other furnaces the arrangement substantially as described of piping

page_text: for heating air and delivering it into a hollow perforated bridge or at rear of the
ordinary bridge in order to meet and consume the gases rising from the fire grate.
Dated this 20th day of February 1899.
WALLACE FAIRWEATHER,
the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
ent Street, Glasgow, Agent for the Applicants.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicants.