Improvements in or connected with Furnace Injectors.
Year: 1896

page_text: I, FRANCOIS PAUWELS, of Roubaix, in the Republic of France, Mechanic, do
hereby declare the nature of this invention to be as follows:-
My invention relates to furnace injectors by means of which certain advantages
are obtained.
In order that the nature of my invention may be readily grasped I shall proceed
to briefly describe a contemplated form thereof.
In the said form I employ a tube flared at its outer extremity for free admission
of air and at this extremity 1 place an injecting device similar to an ordinary
Giffard injector except that it is designed to inject air instead of water. Towards
the other extremity the tube is pierced by a number of openings to which are fitted
a number of parallel screens, flaps or plates whose function is to aid in the mixing
and directing of the injected air and steam. The stean onters the injecting device
by a side tube whilet the air enters by openings close to the nozzle of the said
device. A conical spindle is employed for regulating the steam supply. The
screens, flaps or plates are hinged so that they may be placed in the most suitable
position for mixing and distributing the air and steam to the furnace. To the said
screens, flaps or plates is articulated a rod in such manner that as this is advanced or
withdrawn the angle of inclination of the plates is altered and this may be effected
by a bar passing through the flared opening at the rear end of the apparatus where
it may be operated by a hand wheel or the like.
My invention is designed to be placed below and at the sides of the furnace in
such manner as to produce the best effect upon the combustible material in the
furnace.
I desire it to be understood that the said contemplated form is to be taken simply
as a type or illustration of the scope of my invention; and that I do not limit
myself to the precise details of construction herein specified.
Improvements in or connected with Furnace Injectors.
I, FRANCOIS PAUWELS, of Roubaix, in the Republic of France, Mechanic, 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 has for its object to effect the more perfect combustion of pour
qualities of coal and of fuel dust whilst increasing the steaming power per kilogram
of the coal or fuel burnt in furnaces for steam generators and for other purposes.

page_text: This invention has further the advantage of improving the insufficient draught
which produces insufficient combustion of the gaseous products.
In the accompanying drawings
Fig. 1 is a front elevation of a steam boiler with water drums above the furnace
to which my apparatus is applied.
Fig. 2 is a vertical longitudinal section through the furnace of the boiler shewn
in Fig. 1.
Fig. 3 is a horizontal section through the ash pit below the grate.
Fig. 4 is a front elevation of an internally fired boiler to which my invention is
applied.
Fig. 5 is a vertical longitudinal section through the furnace of the boiler shewn
in Fig. 4.
Fig. 6 is a horizontal section through the ash pit of the boiler shewn in Fig 4
below the grate.
Figs. 7, 8 and 9 illustrate the Giffart injector employed in my apparatus,
respectively in longitudinal section, in plan, and in front elevation.
Fig. 10 is a longitudinal section of a modified construction of the injector.
Figs. 11 and 12 are longitudinal sections of the apparatus shewn constructed in
two different arrangements, that at Fig. 11 having fixed louvres, whilst that at Fig. 12
has moveable louvres.
Fig. 13 is a front end elevation of the apparatus with moveable louvres.
Fig. 14 is a plan of one arrangement of grate har which is particularly adapted
for use with my apparatus.
A tube A Figs. 2, 3 6 and 12, ending in the form of a flaring mouth B directed
towards the entrance of the air, receives at that end nu apparatus C constructed on
the same principle as the Giffard injector but with this difference that it draws in
air instead of water. The other end. of the tube A is formed with slots which
receive louvres or screens J arranged in stages parallel one to the other, and acting
so as to divide into parallel streains or sheets the mixture of air and steam which is
projected inwards by the apparatus C.
The steam enters in C through the tubular connection D Figs. 7 and 8 and the
air enters through the apertures E. A pointed spindle H regulates the discharge
through the nozzle. The function of the louvres or screens arranged in stages as
above described consists in dividing and distributing to the different parts of the
furnace the mixture of air and steam in such a manner that all the parts of the said
furnace will be acted upon equally thereby. A hinged device 1 Fig. 12 allows of
these louvres being moved, so as to assume the inclination which is most suitable
for the effect to be produced upon the fire. A. jointed rod K connected to the
moveable louvres J at one end, and to a rod L at the other end is actuated, for the
purpose of regulating the inclination of the louvres, by means of an operating
screw M worked by the hand wheel N and adapted to act upon the bent end of L.
These apparatus are arranged under the furnace on each side of the latter and
act in opposite directions to each other and thus produce a mixing or stirring up of
the air and steam which promotes complete combustion of low grade coal and other
fuel-dust. The grate may have its bars placed very close together, but at a
distance apart that may vary to an extent to suit the nature of the fuel, say with
spaces of three millimetros in maximum, so as to allow of the passage only of
materials in a state of extreme subdivision. Under these circumstances it is
necessary to use the blast. It is the general arrangement of these devices which
produces the economy that is realised in the combustion of low grade coal, together
with a much longer duration of the bars, by reason of their being cooled by the
blowing in of air.
Having now particularly described and ascertained the nature of this 'inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. An injector or blast apparatus for furnaces designed to promote the combustion

page_text: of low grade coal and other fuel dusts, characterised by the combination of a steam
and air injector with dividing or distributing louvres or screens which may be
moveable or fixed, and which have the effect of distributing the mixture of air and
steain to all the parts of the furnace and thus to considerably improve the combustion,
substantially as described.
2: The application of the injector or blast apparatus, specified in the first claim,
to all kinds of furnaces having grate bars of any form.
Dated this 21st day of January 1897.
ABEL & IMRAY,
Agents for the Applicant.