Improvements in Apparatus for Supplying Furnaces with Pulveru- lent Fuel.
Year: 1899

page_text: Date of Application, 30th Nov., 1899
Complete Specification Left, 28th Aug., 1900-Accepted, 13th Oct., 1900
Complete Specification Left, 28th Aug., 1900-Accepted, 13th Oct., 1900
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Supplying Furnaces with Pulveru-
lent Fuel.
I, HUGO BUDERUS, of Hirzenhain, in the Grand Duchy of Hesse, Manufacturer
and Privy Counsellor, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the class of furnaces in which coal dust or other pul-
verulent fuel is forced into the combustion chamber by injected air and the
object of my said invention is to secure an intimate mixture of fuel and air
before the fuel is forced by the air issuing from the compressed air pipe or
nozzle into the combustion chamber and prior to the admission thereto of a
further supply of air.
According to my invention the fuel in a finely divided condition is driven down-
wards by a device consisting of a wheel provided with blades or vanes. At the
back of the fuel hopper there is a channel which communicates with the atmos-
phere and the lower end of which opens into the air-blast chamber tangentially
to the aforesaid device.
Compressed air is forced through the nozzle. By reason of the suction exer-
cised at the nozzle air is drawn in through the aforesaid channel and mixes very
thoroughly with the fuel as it is fed forward by the aforesaid device. The
thorough mixture of fuel and air is caused by the action of the air issuing from
the nozzle to pass to the front of the nozzle, whence, whilst receiving additional
air, it is forced through a pipe or channel into the combustion chamber.
In the rear of the nozzle a pipe leads from an air heater and opens into the
pipe or channel in which the nozzle is situated so that in consequence of the
vacuum created by the nozzle hot air may be caused to pass into the mixture
of fuel and air. The pipe leading from the air heater is fitted with a valve to
regulate the quantity of hot air thus admitted.
111 The 90th
Navamba 1900
COMPLETE SPECIFICATION.
30 Improvements in Apparatus for Supplying Furnaces with Pulveru-
lent Fuel.
I, HUGO BUDERUS, of Hirzenhain, in the Grand Duchy of Hesse, Manufacturer
and Privy Councillor, do hereby declare the nature of this invention and in
[Price 8d.]

page_text: what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
My invention relates to the class of furnaces in which coal dust, or other pul-
vurulent fuel is forced into the combustion chamber by injected air, and the
object of my invention is to secure an intimate mixture of the coal dust, or other
pulverulent fuel with air before the fuel is forced, by air issuing from the com-
pressed air-pipe, or nozzle, into the combustion chamber, and prior to the ad-
mission thereto of a further supply of air as hereinafter described.
In Figure of the accompanying drawing I have shewn in longitudinal
section an apparatus constructed in accordance with my invention; and in
Figures 2 and 3 I have shewn longitudinal sections of modifications as herein-
after described.
The fuel in a finely divided condition is driven downwards from the hopper k
by a wheel g provided with blades, or vanes and rotated in the direction indicated
by the arrow. At the back of the hopper is a channel i which communicates
with the atmosphere, and the lower end of which opens into the air-blast chamber
tangentially to the wheel g.
Compressed air is supplied through the injector consisting of a pipe a and
nozzle band by reason of the suction exercised at the outlet c of the said nozzle,
air is drawn through the channel and mixes very thoroughly with the fuel, as
it is projected by the wheel g. The thorough mixture of fuel and air thus made
passes through the chamber d to the front c of the nozzle receiving additional
air and it is thence forced through the pipe into the combustion chamber of
the furnace to which the pipe h leads. The supply of air through the channel i
can be regulated by means of the valve . Into the pipe h below and in rear of
the front of the nozzle b opens, at e a pipe f leading from an air heater and pro-
vided with a regulating valve. The rarefaction of air produced by the nozzle b,
causes, when the valve in the pipe f is open hot air to pass into the mixture of
fuel and air passing as aforesaid.
In the arrangement shewn in Figure 2 the pipe ƒ is situated at some distance
to the rear of the wheel and the pipe a leading to the nozzle b may conveniently
be passed through the pipe f as shewn. The pipe f in this case is shewn as
forming a rearward continuation of the pipe h being connected therewith by a
bend. To prevent air passing from the pipe f below the nozzle b, so as not to
mix properly with the fuel, I arrange a transverse partition m so as to surround
the lower part of the nozzle b. The opening c of the nozzle is also situated
somewhat further backward than in Figure 1 so that it may the better exercise
its inducing effect upon the air admitted through the channel i.
The arrangement may also be modified as illustrated by Figure 3. Here the
nozzle tube a extends in continuation of the nozzle b in a straight line through a
wall at the end of the pipe h whilst the pipe f opens into the pipe in the vicinity
of the said wall. The partition m is also employed as in Figure 2 and in other
respects the arrangement may be similar to the arrangement Figure 2.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is:-
1. In furnaces for burning coal dust, or other pulvurulent fuel, a fuel charging
device consisting of an air injector or compressed air admission nozzle, and a
hopper and fuel feeding device having at rear an air channel through which air
is admitted to the fuel, so that a thorough mixture of fuel and air is driven by
the injected air towards and into the combustion chamber of the furnace sub-
stantially as herein before described.
2. The combination with an arrangement such as is claimed by the preceding
claiming clause, of a pipe leading from an air heater, and opening behind the
outlet of the injector, or nozzle into the pipe leading into the furnace substantially
as hereinbefore described.

page_text: 3. A modification of the arrangement claimed by the second claiming clause
consisting in arranging the pipe from the heater further to the rear and pro-
viding a partition surrounding the lower part of the injector, or nozzle pipe
to prevent air passing to the furnace without becoming mixed with the fuel;
substantially as herein before described.
J 1
OOL
e
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.