Year: 1894

page_text: I, EDWARD JOHN BOOTY, of 4 Melbourne Road, Leicester, in the County of
Leicester, Boiler Inspector, do hereby declare the nature of this invention to be as
follows:-
My invention relates to an improved construction of boiler furnaces and its object
is to obtain more perfect combustion of fuel and smoke, than is possible in ordinary
furnaces.
My invention consists in so arranging the bridge at the furnace end as to cause
a current of air or currents of air to be delivered from the said bridge in a
direction towards the furnace front.
In one method of carrying my invention into effect I arrange a hollow furnace
I connect this bridge to a pipe
bridge having perforations passing towards the fire.
passing through the furnace front and running underneath the fire bars. This pipe I
cause to open to the air in any convenient position and I regulate the opening by means
of butterfly, throttle or other valve. To the pipe I connect a steam jet supply from the
boiler and this jet when operating forces a current of air through the said pipe. This
air is delivered into the hollow fire bridge and discharges from the said bridge by
orifices pointing in the direction of the furnace. By my invention air is delivered
into the furnace, and furnace gases or flame leaving the furnace, in a direction
By this
contrary to that in which the flame and furnace gases are travelling.
device I thoroughly burn all smoke and inflammable gases which would otherwise
esca pe combustion, and so cause not only nuisance but also serious loss of fuel.
It is to be understood distinctly that the perforations in the fire bridge are all
arranged on the interior surfaces so as to project air towards the fire. The back
and sides of the fire bridge are made solid.
The air may be propelled by fan or other blast arrangement instead of by steam
jet, and the bridge may be made of any convenient material such as iron, or even
fire brick. An iron or steel bridge may be cast and coated with protecting fire
clay or gannister.
.onl
ས་
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant.
1, EDWARD JOHN BOOTY, of 4 Melbourne Road, Leicester, in the County of
Leicester, Boiler Inspector, 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 :-
My invention relates to an improved construction of boiler furnaces and its object

page_text: Is to obtain more perfect combustion of fuel and smoke, than is possible in ordinary
furnaces.
My invention consists in so arranging the bridge or bridge wall in furnaces, as to
cause a current or currents of air to be delivered from the said bridge or bridge
wall in a direction towards the furnace front.
One method of carrying my invention into effect is illustrated in the accompanying
sheet of drawings.
Figure 1 is an end elevation of a Lancashire boiler with the furnace doors
removed for convenience of illustration.
Figure 2 is a longitudinal section through the same boiler.
Referring to Figures 1 and 2 I arrange a hollow furnace bridge A having
perforations B, B, B, passing towards the direction of the fire. I connect this
bridge A to a pipe C passing through the furnace front and running underneath
the fire bars D, D. This pipe I cause to open to the air in any convenient
position and regulate the opening by means of a butterfly throttle valve E or
any other suitable valve may be used. To the pipe C I connect a steam jet
supply F from the boiler and this jet F when operating, forces or induces a current
of air through the pipe C in the direction shown by the arrows. This air is
delivered into the hollow fire bridge A and discharges from it by the orifices or
perforations B B B, pointing in the direction of the furnace front as shown by
arrows G.
Thus by my invention air is delivered into the furnace, and mixes with the
furnace gases or flames leaving the furnace, in a direction contrary to that in which
the flame and furnace gases are travelling. By this device I thoroughly burn all
smoke and inflammable gas which would otherwise escape combustion, and so avoid
not only nuisance but serious loss of fuel.
It is to be understood distinctly that the perforations or orifices in the fire bridge
are all arranged on the interior surface so as to project air towards the fire. The
back portion of the fire bridge is therefore made solid.
I may also apply my invention to other than "Lancashire" or "Cornish "
horizontal flue boilers and in vertical or "loco" type boilers I arrange nozzles just
above the fire bars and pointing downwards toward the flame and these nozzles
are suitably connected to my forced air arrangement by a cross pipe or similar
means.
The air may also be propelled by fan or other blast arrangement instead of by
steam jet and the bridge may be made of any convenient material such as iron, or
fire brick. An iron or steel bridge may be cast and coated with protecting material
such as fireclay or gannister.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
1. In the furnaces of steam boilers the use of a fire bridge or bridges having
perforations or orifices on the inner side next the fire through which a stream or
streams of air is or are forced in the direction opposite to that in which the furnace
gases are travelling by the action of an inductive steam jet or other suitable
means.
"
2. In Lancashire'
""Cornish' or other horizontal flue boilers the particular
arrangement and combination herein before described and illustrated in the
accompanying drawings.
Dated this 15th dox of July 1805
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicant.