Improvements in and connected with Furnaces for Steam Boilers.
Year: 1892

page_text: Date of Application, 15th Jan., 1892
Complete Specification Left, 15th Oct., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in and connected with Furnaces for Steam Boilers.
1, EUGEN BAGGE, of Loerrach, Grand Duchy of Baden, in the Empire of
Germany, Steam Boiler Inspector, do hereby declare the nature of this invention
to be as follows:-
My invention relates to furnaces for steam boilers the object being to effect a
complete consumption of smoke.
According to my invention I construct boiler furnaces with fireproof channels
behind the fire bridge, from which the gases of the smoke are compelled to flow
downwards into a chamber provided with two valves arranged under the fire bridge,
through one of which valves air is introduced and is caused by the other valve to
flow upwards into the said chamber so that the gases of the smoke meet the air at
about a right angle in the chamber. The result of the mixture thus produced and
of the heating of the gases of the smoke in passing through the channels which
become red hot is that the combustion of the gases is effected. The said valves are
arranged in a valve box under the fire-bridge and the valve which directs the air
upwards serves also to heat it by means of heating ridges which cause it to issue in
radially directed streams. By moving the valves into an approximately horizontal
position, ashes can be removed from the chamber.
An arrangement is provided for automatically closing the first named or air inlet
valve so as to cut off the supply of air for a certain time after the furnace has been
stoked. This arrangement consists of a cataract having a suction valve arranged
in its piston and a regulating screw valve, the prolonged spindle of which latter is
carried through the cover of the pump barrel and can be rotated from without by
means of a handle which moves an index attached to the spindle or to the spindle-
casing connected to the latter by a spring and groove for the purpose of indicating
the duration in minutes of the upstroke of the cataract upon a fixed dial plate. A
lever on the cataract is connected with the piston rod by a chain fastened to a
cross head and taken up by a sector.
Before the furnace is stoked at any time, the cataract piston is drawn up by the
stoker pulling a handle attached to the cataract lever whereby through an arrange-
ment of levers and rods the air inlet valve is opened, the cataract lever in slowly
rising slowing closing the valve again.
For very large furnaces I employ a heating plate between the firebridge and the
covering of the channels for the purpose of preliminarily heating the gases of the
smoke; and a throttle valve connected by suitable rods and levers to the cataract
so that when the cataract piston is moving down each time the furnace is stoked
the throttle valve is partially closed thereby automatically throttling the gases of
the smoke.
Instead of employing a cataract I sometimes make use of a checking arrangement
consisting of gear wheels mounted in a vessel which is partially filled with oil in
such a way that this gearing is set in action by the weight of the air inlet valve
when raised, whereupon a check vane which engages with the gearing, after the
manner of a fly or a Root's blower slowly revolves in the oil and thus, the gear
wheels being connected by suitable rods and levers with the air valve, the latter is
slowly closed. Or I can employ a tumbling arrangement instead of the cataract
consisting of an oscillating vessel for the reception of a fluid and divided by a
partition into two chambers from one of which the fluid flows through a regulating
valve into the other when the vessel assumes a horizontal position thereby causing

page_text: a change in the equilibrium of the box and making it tilt thereby closing the valve
through the medium of an arm attached to the vessel and connected with the valve.
Dated the 15th day of January 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Furnaces for Steam Boilers.
I, EUGEN BAGGE, of Loerrach, Grand Duchy of Baden, in the Empire of
Germany, Steam 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 furnaces for steam boilers, the object being to effect a
complete consumption of smoke.
In order to enable the invention to be fully understood I will describe the same
by reference to the accompanying drawing, in which :-
Figure 1 is a front clevation of a steam boiler constructed according to my
invention:
Figure 2 is a vertical section through the steam boiler; and,
Figure 3 is a horizontal section through the flue :
Figures 4, 5 and 6 are details.
Behind the fire bridge F (Figure 2) are channels K constructed of brickwork or
other fire-resisting material and chambers C. The channels K must be situated
below the level of the fire-bridge.
is a valve-box having valves p and p for the admission of the secondary
current of air and is situated below the fire-bridge.
The smoke gases are mixed in the chamber C with the secondary current of air
entering through the valve-box band are heated and consumed in passing through
the red hot channels K.
The valve-box b is provided with heating flanges and is carried so far upward
that the currents of hot air escaping from the channels between the flanges are
guided into contact with the gases of the smoke, and must intersect the latter
exactly at the fire-bridge at about a right angle.
In order to clear the ashes out of the chamber C the second flap pl of the valve-
box bis provided. If both valves and pl are turned into the horizontal position,
the chamber C can be cleared out during working.
The valve is automatically closed some little time after each fresh charge of
fuel and this is effected by means of a cataract pump P, the valve-box being
automatically closed by the action of the cataract pump on the valve p.
Immediately the furnace is charged the valve p is opened and the piston of the
cataract pump is in its highest position and it is only a short time after the furnace
has been charged that the piston arrives at its lowest position and closes the
valve p.
To the fire door is fixed a chain lª connected to a lever * of the cataract. On
the fire door being closed the chain pulls up the lever which is provided with a
hook which in rising carries with it the lever ². Connected to this lever h² is a
wire for operating the lever on the fire plate, which lever actuates the
valve p by means of a rod l. It will be seen that on the fire door being closed the
air-valve p is opened and is automatically caused to gradually close by the cataract
pump P in the following manner. The lever h² has connected to it a connecting
rod which passes behind the pump P and actuates a crank h³ at the head of the
pump P: This crank operates another connecting rod * situated inside the
pump and actuates the pump plunger P. By this construction on the fire door
being closed the lever * is raised and the plunger P₁ is also raised. When the

page_text: plunger P' slowly descends the lever will also fall slowly and the air-valve p will
be gradually closed.
The lever is provided with a lug or projection * which before the said lever
reaches its highest position comes against the hook and upon the lever / con-
tinuing its upward movement the said lug causes the hook to become disengaged from
the pin o on the lever h² when the latter will be free to descend.
It will be understood that the lever can be operated in other ways than by
being connected to the furnace door and that the levers * and can be connected
together either by the hook and pin arrangement as shewn or by any other suitable
means.
The cataract pump P is shewn in transverse section in Figure 4. On the
piston P is an inlet valve u, pressed down by a spring, and covering the holes o in
the piston; also the regulating screw valve w which when the piston descends
allows the oil under the piston to pass to the upper surface of the latter through a
small opening. The prolonged spindle o' of the screw valve w slides in the
casing H (which rotates in the cover of the pump) by means of a spring and
nut w. By the rotation of H 10' is also turned and the valve w opened more
or less.
The lever is provided with a screws and nuts to which the chain / connected
to the lever h' is fastened. If the position of be changed the extent of opening
of the valve p is increased or diminished.
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. A furnace in which the combustion of the smoke gases is effected by the
following method:-The heated secondary air currents escaping in a radiating
manner from the channels of the valve box b are guided so as to meet the smoke
gases and are made to intersect the latter at about a right angle immediately by the
fire-bridge, and this mixture of smoke gases and heated air is heated in passing
through the red hot channels K which are situated below the level of the edge of
the fire-bridge. The secondary current of air is automatically cut off from the
valve box by means of a cataract pump some minutes after each stoking operation
as hereinbefore described.
2. In a furnace for steam boilers the following details of construction―
(a) The cataract pump (Figures 1, 4, 5) P, with an inlet valve v constructed
on the piston P, and a regulating screw valve w, the prolonged spindle wo
of the latter being guided by a nut and spring w² in the casing H and
receiving their rotation from it.
(b) The arrangement of the double valve p, p¹ in the valve box b, the valve p
serving to admit the secondary air current to or cut it off from the valve
box b, and the valve p' serving to allow of the removal of the ashes from the
chamber C.
(c) A regulating arrangement consisting of the screws on the rotating lever h
by changing the position of which screw the extent of opening of the
valve p is modified or varied.
3. The improvements in furnaces for steam boilers herein before described and
illustrated in the accompanying drawing.
1335
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.