Improvements in Blast Apparatus for Furnaces.
Year: 1898

page_text: Date of Application, 11th Jan., 1898-Accepted, 24th Sept.,
1898
COMPLETE SPECIFICATION.
Improvements in Blast Apparatus for Furnaces.
I, HENRY BIRKBECK, of the Firm of Tongue & Birkbeck, of 31, Southampton
Buildings, Chancery Lane, London, England, Fellow of the Chartered Institute
of Patent Agents, do hereby declare the nature of this invention (a communica-
tion to me from abroad by Jasper Lawrence Rowe, of 224E, Broad Street,
Richmond, in the County of Henrico, and State of Virginia, United States of
America) 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 blast apparatus for furnaces and has for an object to
provide a simple construction by which to supply mixed steam and air in such
manner as to secure a better combustion of the fuel and the invention consists
in certain novel constructions, combinations and arrangements of parts as will
be hereinafter described and pointed out in the claims.
In the drawings:
Fig. 1 is a top plan view of this apparatus.
Fig. 2 is a front view thereof, and
Fig. 3 is a side view of the apparatus the ash pit door and grate bars being
shown in connection therewith.
The apparatus is arranged or works in the ash pit door A in such manner
as to supply the mixed air and steam under the grate bars B of the furnace as
best shown in Fig. 3. The apparatus may be permanently connected with the
door A or may be removable so it can be used at intervals or whenever desired.
The flue C may be of any desired shape and is provided at its outer end with
the flared or funnel-shape mouth D in which an ample supply of air may be
drawn. At such end the flue C is contracted by the inwardly projecting side
flanges or beads E and also by the steam jet nozzle F supplied by steam pipe G
and advantageously made of cast iron. This nozzle is supplied with about
sixteen one sixteenth of an inch holes directed toward the inner rear end of the
flue. In the flue C in rear of the nozzle I provide a mixer for steam and air.
This mixer is shown as comprising the side wheels H and the central wheel I,
all being arranged to be acted on and turned by the steam discharged by the steam
jet and to effect a mixture with such steam of air in such manner as to aid the
combustion in the furnace.
The side wheels H are set at an angle and face slightly toward the steam jet
nozzle while the wheel I stands in a line between the side wheels and squarely.
in line with the nozzle. The two side wheels operate to draw the air in and the
middle wheel mixes it with the steam and the steam and air is supplied to the
furnace in such manner as to effect a practically perfect combustion burning up
the gases etc. that would otherwise go out of the stack and thus increasing the
heat in the furnace and resulting in a great saving of fuel as will readily appear.
The use of the three wheels arranged and operating as described is of great
importance in securing a proper supply of air and the mixture thereof with
the jetted steam.

page_text: The wheels are advantageously made as shown in the form of bladed wind
wheels so they will be properly turned by the steam and will when so turned
draw in the air and mix the same with the steam.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
In a blast apparatus for furnaces the combination of the flue the steam jet
nozzle, the wheels arranged at opposite sides of said flue and the central wheel
arranged in line between said side wheels the said wheels being arranged to be
operated on by the steam discharged from the nozzle substantially as described.
1111
J
1000
TONGUE & BIRKBECK,
Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.