Improvements in Apparatus for Preventing Smoke in Steam Boiler and other Furnaces.
Year: 1892

page_text: Date of Application, 2nd May, 1892
Complete Specification Left, 2nd Feb., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Preventing Smoke in Steam Boiler
and other Furnaces.
We, JOSEPH Ashworth, PhilIP ASHWORTH, and RICHARD ASHWORTH
Junior, all of the Tonge Mill Middleton in the County of Lancaster, Manu-
facturers, do hereby declare the nature of this invention to be as follows:-
This invention relates to apparatus for consuming smoke or for preventing its
emission from boiler furnaces.
At the back of the furnace and in front of the bridge, we arrange a tube or a
series of tubes constructed of any suitable material the lower ends of which enter
into the ash-pit. These tubes are carried up the front and over the top of the
bridge and their rear ends are brought to any desired point or points in the flue:
Air thus enters the ash-pit and passes through the tube or tubes, being heated
during its passage by the flames or gases which would ordinarily impinge upon
the bridge. The air thus heated is led into the flue and is there caused to mix with
the smoke to induce secondary combustion.
In place of fixing a regularly constructed tube or a series of tubes in front of the
bridge, a suitably shaped plate or partition may be arranged to form one side of a
conduit or passage the other side being formed by the bridge itself. From this
conduit the heated air may be led into the flue by an extension of the conduit or
by pipes or nozzles..
If desired a valve or damper may be arranged to control the amount of air
entering and passing through the tubes.
Dated this 29th day of April A.D. 1892
:
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Preventing Smoke in Steam Boiler
and other Furnaces.
We, JOSEPH ASHWORTH, PHILIP ASHWORTH, and RICHARD ASHWORTH,
Junior, all of the Tonge Mills, Middleton, in the County of Lancaster, Manu-
facturers, 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 apparatus for consuming smoke or for preventing its
emission from boiler furnaces.
:
At the back of the furnace and in front of the bridge, we arrange a tube or a
series of tubes constructed of any suitable material the lower ends of which open
into the ash-pit. These tubes are carried up the front and over the top of the
bridge and their rear ends are brought to any desired point or points of the flue.
Air thus enters the ash-pit and passes through the tube or tubes, being heated
during its passage by the flames or gases which would ordinarily impinge upon the
bridge. The air thus heated is led into the flue and is there caused to mix with
the smoke to induce secondary combustion.
In place of fixing a regularly constructed tube or a series of tubes in front of the
bridge, a suitably shaped plate or partition may be arranged to form one side of a
conduit or passage the other side being formed by the bridge itself. From this conduit
the heated air may be led into the flue by an extension of the conduit or by pipes
or nozzles.

page_text: r1
If desired a valve or damper may be arranged to control the amount of air
entering and passing through the tubes.
In order that our invention may be more clearly understood we have hereto
appended drawings illustrating our improvements applied to the furnace and flue
of an ordinary internally fired boiler.
Referring to the drawings
Figure 1 represents a longitudinal section of the furnace and flie with our smoke
preventing apparatus applied thereto.
Figure 2 illustrates a cross section of the flue behind the bridge shewing the
rear ends of the air conveying tubes.
Figure 3 is a similar section shewing the substitution of a single flattened tube
for the three tubes illustrated in Figure. 2.
Figure 4 represents a longitudinal section of an air containing tube the back
plate of which is dispensed with.
The furnace A may be of the usual construction and be provided with the usual
fire brick or similar bridge B. Upon the upper part of the bridge is placed a
returned or curved pipe or pipes C the front and lower end or ends of which are
desired
in communication with the ash-pit while their rear ends are brought to
any
point in the flue. As illustrated it is preferred to make the front plate D of each
air tube of greater thickness than the back plate E in order to insure its resisting
the heat and any blows it may be subjected to during the process of firing. The
tube or tubes C are preferably made of iron but any other suitable material may
be employed, and instead of leading them horizontally towards the back of the flue
they may be placed at any angle which facilitates the mingling of the air with the
products of combustion.
The inlet to each air tube is preferably opened and closed by a damper F of any
The amount of air
ordinary construction controlled by a rod and handle G.
admitted can thus be adjusted to the requirements of each individual case.
In the apparatus illustrated by Figures 1 and 2 three air conveying pipes C are
used preferably of the oblong section shewn, but any other convenient number may
be used or if desired, a single flattened tube may be substituted as represented in
Figure 3. If desired the back plate E of the front end of the pipe or pipes may
be omitted in which case the back of the pipe inlet is formed by the upper front
part of the bridge B.
Any convenient form may be given to the tubes C but in order to insure a
steady draught it is preferred to make the inlets in the form shewn and with a
much wider opening than the outlet.
It is obvious that that part of the bridge which is behind the inlet of the tube or
tubes may be dispensed with, in which case the inlet ends of the tubes themselves
form the upper part of the bridge.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is-
.
In a boiler or other furnace, a tube or channel or a series of tubes or channels
which convey air from the ash-pit into the flue, constructed and arranged substan-
tially as and for the purpose hereinbefore described and as illustrated by the
accompanying drawings.
AT
AD 1009