Year: 1886

page_text: I, JOHN L. PESLIN of Appleton in the County of Outagamie, State of Wisconsin,
United States of America, 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 relates to the construction of a smoke and gas consuming furnace,
wherein the main fires having been once started, are fed by partially coked coal,
the smoke and gas generated during this process of partial koking being delivered
beneath, and forced to pass through, the main fire of the furnace. From the
peculiar construction and arrangement of my furnace, I am able to utilize every
particle of heat generating material entering into the composition of the coal, and
consequently, I am able to maintain my fires without contaminating the atmosphere
with soot or disagreable odors, and owing to the perfect combustion which I obtain,
the boiler flues are not clogged or coated with soot, and consequently, I am able to
generate a greater amount of steam from a given amount of fuel than would be
possible in cases where the flues were coated with soot; for, as will be readily
understood, soot being a non-conductor of heat, will prevent the heat passing
through the flues from acting to the fullest extent as a steam generating agent.
Another decided advantage which I obtain by constructing my furnace in the
manner to be hereinafter described, is that it never becomes necessary to open the
doors leading to the main combustion-chambers, and consequently, I avoid all
sudden cooling of the boiler, and thereby not only am I able to maintain a steady
steam pressure, but I materially decrease the wear and tear upon the boiler.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar letters of reference indicate corresponding parts in
both the figures.
Fig. 1 is a front view of a battery of boilers, the furnaces of which are con-
structed in accordance with the terms of this invention, part of the front plate
being broken out; and
Fig. 2 is a detail view illustrating the construction of the grate of the coking-
chamber.
Although I have illustrated my furnace as arranged in connection with a bat-
tery of boilers. I wish it to be distinctly understood that the principle is equally

page_text: applicable to single boilers, and I also wish it to be understood that the coking-
chamber instead of being arranged at the sides or side of the boiler, could be
arranged in front of it.
In the construction illustrated, A represents the boilers, of which there are two
in the battery. Upon the outer side of each of the boilers I arrange a coking-
chamber a that is divided from the main combustion chamber by a wall or
partition b, which is made from blocks of fire clay that are formed with apertures b¹
through which there is passed a rod c which is properly mounted in the rear wall
of the battery casing and the front plate of the same, or the entire wall b could
be made of a single block of fire clay. B2 is the ash pit beneath the main
grates B¹ being arranged upon an incline, as indicated. From the outer edge of
the main grate there is arranged a downwardly extending partition or wall d that
is preferably made of sheet iron, and which after extending downward for some
distance is carried toward the outer wall of the battery, and then runs upward
parallel with said outer wall forming the flue e; the material of which the wall or
apron d is made, being supported by the rear wall of the furnace and the fronte
plate.
The frame of the grate upon which the coal to be coked is placed, is shown at f¹
and is provided with trunnions f2 that are mounted in proper bearings that permit
of the tilting of the frame f¹ to the position in which it is shown in dotted line
on the right in the drawing Fig. 1. The forward edge of the frame f¹ abuts
against the lower edge of the dividing wall or partition b, and from the lower side
of the grate there is a downwardly extending flange f³, the outer face of which is
formed in the arc of a circle that is concentric with the axis of the trunnions upon
which the grate is swung. The circular face of this flange f³ rests closely against
the upper outer edge of the main grate B¹.
The grate-bars g¹9² g³ are each provided with dove-tail projections which fit
within correspondingly formed recesses in the frame f¹, and these grate-bars are
arranged in series in the order named, the bars g³ which are deeper than the
bars g² or g¹, being further removed from the inner edge of the frame f' than are
the bars g or g¹ of the same series. The forward trunnion f2 of the grate-frame f¹
projects outward through the front-plate of the furnace, and to this forwardly
projecting end there is secured a lever arm h.
Communication with the coking-chamber, the combustion-chamber, and ash pit
and the air space beneath the grate of the coking-chamber is established through
the medium of doors that are mounted in the usual manner upon the front-plate
of the furnace, as shown upon the left in the drawing Fig. 1, the position of these
doors being indicated by dotted lines upon the right of said figure.
Between the two boilers there is a double coking chamber provided with
partition walls d, as in the case of the outer coking chamber, and with a flue e¹
which leads to the ash pit beneath the combustion chamber of each of the boilers
shown. In case it should be necessary to let out the fire in one of the combustion-
chambers, then communication between the flue e¹ and the ash pit of the com-
bustion chamber in which the fire was so drawn, would be cut off through the
medium of a damper k that is arranged directly beneath the centre-line of the
flue e¹, and so mounted that although it will normally stand in the position in
which it is shown in full lines in the drawing, it may be thrown to either of the
positions indicated by dotted lines.
In operation the fires are kindled in the ordinary manner within the combustion-
chambers B, and at the same time other fires are kindled in the coking chambers a,
the necessary draught to these cocking chambers being obtained through openings
leading into the air chamber formed by the wall or partition d, the position of the
opening upon the right of the furnace being indicated by dotted lines, while the
opening upon the left is represented as being closed by a door.
As the gas,
smoke, &c., is driven off from the coal it will pass in the direction of the arrows
shown in the drawing from the several coking-chambers to the ash pits beneath
the main combustion-chambers, and thence will pass through the burning material

page_text: resting upon the main grate bars and into the combustion-chamber proper, so that
all combustible and heat-generating matter will be consumed before reaching the
smoke-stack, which is arranged in the ordinary manner in connection with the
combustion chambers.
After the coal placed within the coking-chambers has been practically coked and
deprived of its smoke producing and volatile heat-producing constituents, the
lever his grasped and thrown upward in the direction of the arrow, thus causing
the greater portion of the coke to fall upon the fire within the main combustion-
chamber; but owing to the peculiar arrangement of the grate-bars carried by the
frame f¹, a sufficient quantity of ignited coal will be held upon the upwardly
extending side faces of the grate bars g to start the process of coking and partial
combustion of the next supply of fresh coal that is placed within the coking-
chamber.
In case the natural draught of the furnace should prove to be insufficient to
carry on the necessary coking process within the coking-chambers, I employ a jet
of superheated, steam which I obtain by means of a pipe m that leads from the
steam drum through the upper portion of the main combustion chamber, out
through the front plate of the boiler, downward in front of said plate, and finally
is again carried through the front plate and into the flue leading from the coking
chamber to the ash pit beneath the main combustion-chamber, the pipe being
carried inward in a horizontal line and being located as in the drawing. This
pipe is provided with a series of perforations m³ through which the steam spurts
out in the direction of the arrow shown in connection with the pipe upon the right
in the drawing Fig. 1. When the steam is not required it is shut off by means of
a valve m² arranged as shown on the left in the drawing.
Now although I have described my furnace as arranged in connection with a
boiler, it will of course be understood that other forms of furnace could be
arranged in accordance with the terms of my invention, and it will also be under-
stood that the invention could be applied to the boiler of locomotive engines as
well as to stationary boilers.
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. The herein described method of consuming gases and smoke which consists
in generating said gases and smoke in a koking chamber by means of an auxiliary
fire, causing the gases and smoke so generated to pass by way of a flue to a pit
beneath the fire of the main combustion chamber and thence through the fire and
into the combustion chamber, substantially as described.
2. The herein described method of burning coal which consists in placing the
coal in a coking chamber generating the gases and smoke contained therein and
causing the gases so generated to pass through the main fire, and into the main
combustion chamber, and in finally dumping the coke formed in the coking
chamber into the main combustion-chamber, substantially as described.
3. The herein described method of burning coal which consist in starting
combustion in a main and auxiliary chamber carrying the products of combustion
of the auxiliary chamber through the body of the fire in the main combustion
chamber, continuing the operation until the fuel in the auxiliary chamber is
partially coked, in then dumping the greater portion of the fuel from the auxiliary
chamber into the main chamber leaving only a few glowing coals, in then adding
fresh fuel to the auxiliary chamber, again driving off the gases and again dumping
the greater portion of the mass, substantially as described.
4. In a furnace the combination with a main combustion chamber of a coking
chamber, a flue leading from the coking chamber to a point beneath the grate of
the main chamber and a dumping mechanism arranged in connection with the
grate of the coking chamber, substantially as described.

page_text: 5. In a furnace the combination with a main combustion chamber, of a coking
chamber and its grate formed with a downwardly extending flange, a partition
arranged between the main combustion chamber and the coking chamber, ash pits
or chambers arranged in connection with the main combustion chamber and the
coking chamber, and separated from each other, and a flue leading from the coking
chamber to a point beneath the grate bars of the main combustion chamber, and
a dumping mechanism arranged in connection with the grate of the coking
chamber, substantially as described.
6. The combination with a combustion chamber of two coking chambers, flues
leading from the coking chambers to points beneath the grate of the main com-
bustion chamber and mechanism arranged in connection with the grates of the
coking chambers, whereby such grates may be dumped and their partial load
delivered to the main combustion chamber, substantially as described.