Method and Apparatus for Smoke Burning and Economising the Fuel in the Furnaces of Steam Boilers and other Furnaces.
Year: 1889

page_text: Date of Application, 12th July, 1889
Complete Specification Left. 12th Apr. 1890-Accepted. 17th May, 1890
PROVISIONAL SPECIFICATION.
Method and Apparatus for Smoke Burning and Economising the
Fuel in the Furnaces of Steam Boilers and other Furnaces.
THOMAS RAWSON Engineer and Boiler Inspector East Moor Road Sunderland.
I do hereby declare the nature of this invention to be as follows:-
-
This invention relates to the method and apparatus for smoke burning and
economising the fuel in the furnaces of steam boilers and other furnaces by means of
heated air being supplied to the furnaces and thereby causing the more perfect com-
bustion of the smoke and wasto gases.
For this purpose 1 make use of two or more arches over the fire as shewn in Fig. 1
these arches are made by preference of fire-clay and may be made to any radius and
may be built up in any number of parts or sections. The said arches having three or
more air ways or passages through the centre in the direction of the circumference.
The said arches are each built upon a cast metal plate as shewn at C and D. Fig. 1
these plates are provided with a clear passage for air at each side and also a recess or
hollow as shewn at C and D. Fig. 1.
In fixing or building the said arches on the plates C and D the outside airway or
passage is placed over the clear openings in plates C and D and by the ordinary
draught of the chimney the air in the ashpit is caused to flow round the arches to the
opposite side where it is diverted into the centre air way or passage by means of the
recess or hollow in the plates C and D. Fig. 1 and then flows upon the fire through
the holes in the top and bottom of the centre air way or passage as shewn on
Fig. 7 at H there mixing thoroughly with the smoke and unconsumed gases thereby
on account of its great heat causing a more perfect combustion.
Fig. 1. is a longitudinal section of the apparatus as applied to the furnace of an
ordinary boiler.
A is the front arch placed on plate C called the dead plate the section shewn being
through the line OP as shewn on plan Fig. 2.
B is the back arch placed on plate D called the bridge plate the section shewn
being through the line OP as shewn on plan Fig. 2.
Fig. 2. is a plan shewing the position of the air ways or passages and the recesses
in the dead plate C and the bridge plate D.
Fig. 3. is the section of the dead plate C through the line M N as shewn on
plan Fig. 2.
Fig. 4. is the section of the bridge plate D through the line M N as shewn on
plan Fig. 2.
Fig. 5. is a front view of the front arch, built on the dead plate C.
Fig. 6 is a front view of the back arch, built on the bridge plate D.
Fig. 7. is the section of the arches A and B shewing the air ways or passages and
the outlet passages at top and bottom as shewn at H.
Dated this Eleventh day of July 1889.
COMPLETE SPECIFICATION.
THOMAS RAWSON
Dundum
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COMPLETE SPECIFICATION.
Method and Apparatus for Smoke Burning and Economising the
Fuel in the Furnaces of Steam Boilers and other Furnaces.
THOMAS RAWSON East Moor Road Sunderland, Engineer and Boiler Inspector.
I 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 the method and apparatus for smoke burning an
economising the fuel in the furnaces of steam boilers and other furnaces.

page_text: For this purpose I make use of an apparatus consisting of one or more arches,
placed in the furnace or flue, the said arches having three air-ways or passages through
the centre of the arch in the direction of the circumference, and also openings are
provided in the centre air-way or passage these openings may be made at the top of
the arch or they may be made below the arch or they may be made in both top and
bottom.
These arches may be made circular or with semi-circular tops to any required
radius and the sides may be made perpendicular or diagonal. These arches may be
made in one piece or may be made in sections as may be desired as herein described
and illustrated in the accompanying drawings.
I also make use of a plate or plates called a base plate or base plates having two
suitable airways or passages through the plate or plates and also two recesses these
plates are also provided with projections to allow the firebars to rest thereon or they
may be made without such projections as herein described and illustrated in the
accompanying drawings.
In order to enable my invention to be fully understood, I will proceed to describe
the same by reference to the accompanying drawings in which figure 1 represents a
longitudinal section of the apparatus for smoke burning and economising the fuel in
the furnaces of steam boilers and other furnaces.
N represents the section of the arch and base plate through the line AB. Figure 2.
No represents the section of the arch and base plate through the line A B. Figure 3.
H represents a chamber formed between two brick walls on which rest the base
plate of the arch No to collect dust.
L represents a pipe at each side of the furnace to supply air to the arch N°.
Fig. 2. represents the end section through the line A B. figure 1 at N.
Fig. 3. represents the end section through the line A B. figure 1 at No.
Fig. 4. represents a plan of the base plate S figure 1 and figure 2.
Fig. 5. represents a plan of the base plate K. figure 1 and figure 3.
Fig. 6 represents the section of the base plates through the lines C D. Fig. 2 and
CD. Fig. 3.
Fig. 7. represents the section of the base plates through the lines EF. Fig. 2. and
E F. Fig. 3. Similar letters of reference represent similar or corresponding parts
throughout the several figures of the drawings.
I will proceed to describe how the method and apparatus for smoke burning and
economising the fuel in the furnaces of steam boilers and other furnaces is performed
by the following explanation.
The arch N Fig. 1 is placed upon the base plate Fig. 4 close behind the furnace
door and the arch N° is placed upon the base plate Fig. 5 at the proper distance to
allow the firebars to rest upon the end of each base plate which are shewn with
suitable projections to allow the firebars to rest thereon.
The fire having been lighted and the damper in the flue between the furnace and
the chimney opened, the draught causes the air to enter the arches through the
air-ways or passages P and flow to the opposite side of the arch where it is delivered
into the recess T where it is diverted into the air way or passage V and delivered
into the furnace fire through suitable openings in the air-ways or passages V. These
arches being exposed to the great heat of the furnace fire the air in passing through
is heated to a very high temperature and mixing with the smoke and unconsumed
gases thoroughly burns the smoke and economising the 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
1. The herein described method for smoke burning and economising the fuel in
the furnaces of steam boilers or other furnaces, by means of one or more arches placed
in the furnace or flue of steam boilers or other furnaces, the said arches having three
or more air-ways or passages through them substantially as herein before described.
2. The base plates having 2 air ways or passages and 2 recesses substantially as
herein before described and represented in figures 4 and 5 and figures 6 and 7.

page_text: 3. The combination of the method and construction of apparatus for smoke burning
and economising the fuel in the furnaces of steam boilers and other furnaces by means
of one or more arches placed in the furnace or flue of steam boilers or other furnaces
with the base plates as herein before described and represented in figures 1. 2. 3. 4. 5. 6. 7.
Dated this 11th day of April 1890.
THOMAS RAWSON,
East Moor Road, Sunderland.