Improvements in Coal Dust Firing Apparatus.
Year: 1897

page_text: Improvements in Coal Dust Firing Apparatus.
I, CARL WEGENER, of 14-15, Gitschinerstrasse, Berlin, Empire of Germany,
Engineer, do hereby declare the nature of this invention to be as follows:-
The new coal dust firing apparatus is of the kind already patented by the
inventor in Patent No. 17004 of 1894 with a distributing device arranged in the
air supply tube and from which the coal dust falls down. It corresponds especi-
ally to the Second Claim of the above mentioned patent according to which the
distributor rotates, and to the Third Claim according to which this rotation is
effected by means of a driving wheel placed within the air supply tube upon the
same shaft as the distributor. As the air current sets this wheel in motion, the
current itself takes a circular movement in the opposite direction to the revolu-
tion of the wheel, and practical experiments have proved that in consequence
thereof the dust, which had been uniformly dispersed throughout the air current
is drawn on the further motion of the air current to the periphery of the same,
so that the air current entering into the, combustion chamber carries less fuel
with it at its centre than at its circumference. In order to obviate this draw-
back, longitudinal partitions are arranged within the air channel between the driv-
ing wheel and the distributing device, which longitudinal partitious extend from
different parts of the wall of the channel towards the middle thereof, and check,
the revolving motion of the air current.
The longitudinal profile of the air channel upon the portion between the driv-
ing wheel and the distributing cone differs essentially from that shown in Fig. 2
of the above cited patent. In the former arrangement the air tube was con-
structed immediately above the driving wheel with considerable contraction, and
widened out towards the distributing cone so that the air particles might strike
almost perpendicularly upon the surface of the apron of coal dust created by the
rotating cone. Practical experiments have proved, however, that an approxi-
mately opposite construction of the air channel is associated with a less resistance
and assists a uniform and perfect susception of the dust by the air. According to
the present invention the air channel is contracted above the motor wheel
uniformly until close to the deflecting body, so that the air current in the outer
layer no longer experiences any rotary action and at the height of the dust apron
possesses its greatest speed.
The arrangement for regulating the admission of air has been improved as
follows: A cylindrical damper is provided at two opposite points with a toothed
rack directed upwards. The shaft of the two driving wheels belonging to this
rack goes through the air tube and is provided at one end with a crank. A
checking bar connected with the handle of the crank holds the damper in any
position automatically fast by co-operating with a catch wheel fastened upon the

page_text: air tube, and releases itself automatically when the handle is used for varying
the position of the damper.
Dated this 30th day of June 1897
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.
Improvements in Coal Dust Firing Apparatus.
I, CARI WEGENER, of 14-15, Gitschinerstrasse, Berlin, Empire of Germany,
Engineer, 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:
-
The new coal dust firing apparatus is of the kind already patented by the
inventor in Patent No. 17004 of 1894 with a distributing device arranged in the
air supply tube and from which the coal dust falls down. It corresponds especi-
ally to the Second Claim of the above mentioned patent according to which the
distributor rotates, and to the Third Claún according to which this rotation is
effected by means of a driving wheel placed within the air supply tube upon the
same shaft as the distributor. As the air current sets this wheel in motion, the
current itself takes a circular movement in the opposite direction to the revolu-
tion of the wheel, and practical experiments have proved that in consequence
thereof the dust, which had been uniformly dispersed throughout the air current
is drawn on the further motion of the air current to the periphery of the same,
so that the air current entering into the combustion chamber carries less, fuel
with it at its centre than at its circumference. In order to obviate this draw-
back, longitudinal partitions are arranged within the air channel between the driv
ing wheel and the distributing device, which longitudinal partitions extend from
different parts of the wall of the channel towards the middle thereof, and check
the revolving motion of the air current.
The longitudinal profile of the air channel upon the portion between the driv-
ing wheel and the distributing cone differs essentially from that shown in Fig. 2
of the above cited patent. In the former arrangement the air tube was con-
structed immediately above the driving wheel with considerable contraction, and
widened out towards the distributing cone so that the air particles might strike
almost perpendicularly upon the surface of the apron of coal dust created by the
rotating cone. Practical experiments have proved, however, that an approxi-
mately opposite construction of the air channel is associated with a less resistance
and assists a uniform and perfect susception of the dust by the air. According to
the present invention the air channel is contracted above the motor wheel
uniformly until close to the deflecting body, so that the air current in the outer
layer no longer experiences any rotary action and at the height of the dust apron
possesses its greatest speed.
In the accompanying drawing, which forms a part of this Specification and in
which similar letters of reference denote like parts.
Fig. 1 is a vertical longitudinal section on line 1-1 of Fig. 2 showing the
improvements arranged with the air channel of an apparatus for coal dust firing
according to Patent 17004 of 1894.
Fig. 2 is a horizontal section on line 2-2 of Fig. 1.
Fig. 3 is a side elevation of the device for regulating the admission of air.
a is the air channel, d is the driving wheel mounted on the shaft ƒ which
carries the distributor c and the feeding disc g and is adjustable by means of its

page_text: bearing resting upon the lever connected with the adjusting bar m, nut n
and indicator o. As the air current sets the wheel d in motion the.current itself
takes a rotary movement in the opposite direction to the revolution of the wheel;
in order to obviate this movement the partitions s are arranged between the motor-
wheel and the distributing device. The partitions are at their lower ends 5° 80
curved that they run in the direction of the natural air motion so that the air
passes along the guide channels without resistance.
The arrangement for regulating the admission of air has been improved as
follows: A cylindrical damper e is provided at two opposite points with a toothed
rack e directed upwards. The shaft of the two driving wheels belonging to
this rack goes through the air tube and is provided at one end with a crank to. A
checking bar t connected with the handle of the crank holds the damper in any
position automatically fast by co-operating with a catch wheel u fastened upon the
air tube, and releases itself automatically when the handle is used for varying
the position of the damper.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what [
claim is:
1. A modification of the coal dust firing apparatus protected by Patent No.
17004 of 1894 (Claim 3) in which the rotary motion of the combustion air which
has passed the wheel (d) is counteracted by partitions (s) arranged in the air tube
in an approximately perpendicular and radial position, so that the uniform dis-
tribution of the coal dust in the air current is assisted.
2. A modification of the coal dust firing apparatus with rising air current
claimed as aforesaid, in which the air tube (a) is so arranged that the air passes
along the channel from the wheel (d) to the dust distributing cone (c) under con-
tinuous contraction for the purpose of avoiding the formation of rotary currents
at the periphery of the stream and to give the stream the greatest speed, where
the dust is being taken up by the stream."
3. A modification of the coal dust firing apparatus with rising air current set
forth as aforesaid in which the cylindrical damper e regulating the annular air
supply possesses a rack (e) at each of two opposite places arranged upwards on
the air tube, whilst the two driving wheels are placed upon a shaft (t) passing
through the air tube (a) and every desired position of the damper can automati-
cally be assured by means of the wheel (n) fixed on the air tube and a ratchet (1¹)
connected with the handle of the crank.
Dated this 20th day of March 1898.
W. P. THOMPSON & Co.,
Of London, Liverpool, Manchester and Birmingham,
Patent Agents for the Applicant.