Year: 1886

page_text: My invention relates to certain improvements hereinafter more particularly
mentioned in and in connection with that type of apparatus, or appliances which
are used in, or in connection with furnaces, for giving an additional supply of air
to furnaces and combustion chambers such as above mentioned, having for its
object economy in the combustion of fuel and to more perfectly consume the smoke
and gases given off in the combustion of the fuel.
To this end my invention consists in the use of an air supply pipe or duct a
which is constructed in manner such as shown in Figures 5. 6. 7 and 8, and applied
in manner such as shown in Figures 1. 2. 3 and 4, namely, the pipe a is made of a
length about in the proportion shown in Figures 1 and 3 of the Drawings and is
applied inside and suspended from the crown of the furnace b. The pipe or duct a
is open at both ends, the end a¹ being contracted and is preferably of cast iron, or
fire clay and of section such as shown at Figure 6 so as to give small obstruction
and maximum heating surface the under portion of the pipe being preferably of
thicker metal than the upper portion to prevent its being burnt away. The upper
portion is provided with projecting provisions o having slots d to receive a stud e
as shown at Figures 5, 6 and 8, the slots d being so formed that the pipe a can be
pushed back and then disengaged and withdrawn from the furnace. This stud e is
screwed into and rivetted to the crown of the furnace as shown in the Drawings and
the pipe a is suspended thereby from the crown of the furnace and the stud is pro-
tected from the flame in the furnace. The front of the pipe a is provided with an
elbow mouthpiece f connected and having a through way into the pipe a.
mouthpiece is provided with a steam nozzle g and a cock or valve h. This cock or
valve his connected to a steam supply pipe i which in the case of steam generators
leads to the steam space of such generator and is connected thereto by a cock or
valvek. The other parts shown in the Drawings, namely, the steam generator A,
the fire bars B, the bridge C, may be of any known type and are only inserted in this
specification with the object of giving examples of the application of my invention.
The operation of my invention is as follows. By using and allowing a jet of
steam to pass through the nozzle g into the pipe or duct a a supply of air is induced
and forced through the pipe, or duct a to the back of the furnace 6 and into the
combustion chamber, which supply of air and steam is intensely heated in its passage
through the pipe or duct a and co-mingles with the smoke and gases given off by
the combustion of the fuel at the most efficient point, thereby greatly assisting the
combustion of the gases and the consumption of the smoke.
The
The advantages amongst others belonging to an apparatus constructed and
applied according to my invention are;-the use of the steam jet or nozzle g causes
a forced supply of air through the pipe or duct a which through the use of the
steam and the formation and position of the pipe a becomes intensely heated in its
passage through the pipe a. Forming the invert of the pipe a of thicker metal lessens
the danger of the pipe a sagging or burning. The method of suspending the pipe a
provides for expansion and contraction of the pipe a and protects the suspending
parts from the action of the flame and admits of the pipe being easily withdrawn
and replaced.
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
First. In the employment of air pipes, or ducts of the type and placed as herein
described, the use of a mouthpiece and a steam jet or nozzle whereby the air is
forced through the pipe or duct substantially as set forth.
Second. The use of air pipes, or ducts of the type, for the purposes, and applied
as herein described, of section and varying thickness, such as set forth.
Third. Suspending air pipes, or ducts in furnaces by means of studs substantially
as herein set forth and whereby provision is made for expansion and contraction
and protection from the flame, and renewal.

page_text: Fourth. The combination of a pipe or duct (such as a) with a mouthpiece (such
as f) steam nozzle (such as 9) suspending studs (such as e) applied to a furnace
such as 6 substantially as herein described for the purposes specified.
Fifth. The particular construction of apparatus for supplying air to furnaces
substantially as herein described and shown in the Drawings hereto annexed.
DL:
1000