Improvements in and relating to Furnaces for Steam Boilers.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Furnaces for Steam Boilers.
I, FRANÇOIS PIERRE CRECEVEUR, of Nantes (Seine & Oise), in the Republic of
France, Founder, do hereby declare the nature of this invention to be as follows:-
The invention which forms the subject of the present application relates to fire
boxes for steam boilers, having mechanical feeding device, an oscillating grate,
and a suitable arrangement for causing the consumption of smoke.
My invention will be clearly understood from the following description with
reference to the accompanying drawing in which :
Figure 1 shows a vertical longitudinal section of my improved fire box.
Figure 2 is a front view of the same.
Similar letters of reference denote corresponding parts in both the figures.
As shown in this drawing the hoppers a, intended for receiving the coal or other
fuel are fixed on the front of the fire box by means of hinges a', enabling them
to be opened, and containing a hinged bottom b, a catch or pawl c, and a damper d,
adjustable at will by means of a screw, working in a slot d
On the side opposite the hinges a' are catches all which permit the closing of the
hoppers.
The feeding mechanism comprises a shaft e supported on two bearings e¹ fixed
on the front of the fire box. This shaft has two excentrics f, the straps of which, f¹,
are furnished with arms f" connected to the hinged bottom b. A cone q, over
which passes a belt r¹ serves to impart motion to the shaft e which can, however,
be put in motion by hand, by a fly wheel with handle n.
Below the shaft is arranged a bracket g, supporting a shaft g', on which is
fixed a helicoidal pinion, engaging with another helicoidal pinion y fixed on
the shaft e.
The shaft has an excentric, of which the strap is joined to the lever p,
pivoted at v, on a cross piece v¹, fixed on the support s, and is connected by a
joint u to another cross piece t, which connects all the bars of the inclined
grating o. These bars can therefore all be oscillated at o¹ o' on the supports r.
A device h enables the speed of the feeding apparatus and the oscillation of the
grate to be regulated.
At the lower part of the fire box are suitably arranged a cast grating i and a
front, provided with doors m for admitting access to the grate i.
A grate bar carrier 1, hollow along its whole length, and embedded at each end
in the masonry, is intended to hold the bars and to guard them from the action
of the fire. In this carrier are arranged openings, so as to establish an internal
circulation of air which becomes heated and mixes with the gas to consume the
smoke.
The object and advantages of the invention are as follows:
The bottoms or floors 6 supported on each side of the honners have each two

page_text: trunnions which enable them to move and are connected by the excentrics f. To
examine the inside of the fire box it is sufficient to raise the hooks from the
excentrics, in such a manner as to cause the bottoms to take the position shown in
dotted lines; these bottoms are held in this position by the pawl c, and thus allow
access to the fire box for kindling, after which they are allowed to fall back into
their original position, and the hoppers are filled with fuel.
As the same means are employed for controlling the grating and the bottoms
of the hoppers, the excentrics f give the said bottoms a reciprocating motion which
pushes the fuel to the beginning of the inclined grating, and at the same time,
the lower excentric, joined to the lever of the grating o, puts this latter
in motion, and its oscillation causes the fuel to descend in proportion as it is
brought forward by the feeding bottom; this fuel becomes lighted in advance
from the fire box and the products of combustion traverse the whole length
of the incandescent fire box.
By this continued movement of oscillation and of feeding, the fuel gradually
descends, according to its degree of combustion, and reaches the bottom of the
grating entirely consumed.
The slag or scoria being consequently unable to adhere to the grating, takes the
same direction as the fuel and falls on to the bottom grating i where it can
be easily removed through the doors m. Any pieces of coal which may be carried
with the slag will become consumed.
By means of the cone transmission operated by a belt the quantity of fuel
to be burned is easily regulated.
Thus there is obtained regular heating, perfect combustion of fuel, complete
suppression of smoke, as well as great case in stoking, and considerable saving in
fuel.
Dated thin 10th 1n of V... 1900
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in and relating to Furnaces for Steam Boilers.
I, FRANÇOIS PIERRE CRECEVEUR, of Nantes (Seine & Oise), in the Republic of
France, Founder, 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 a novel furnace for steam generators characterised
by a mechanical feeding device provided with hoppers, a shaking grate and an
arrangement adapted to render the furnace smoke consuming.
My invention will be readily understood from the following description and
by reference to the accompanying drawings, in which:
Figure 1 is a front elevation of the furnace, one of the hoppers being open
and the other closed.
Figure 2 is a sectional view shewing the hopper, and
Figure 3 is a longitudinal section through the furnace.
In the various figures similar letters of reference designate corresponding parts.
As shewn in the drawing, the charging hoppers a are fitted to the front 61 of
the furnace by means of hinges a. The hoppers being arranged upon hinges may
be opened at will in the same manner as the doors of ordinary furnaces and then

page_text: turned back to cover the opening c¹, said hoppers being held in place by lugs f¹
and screw-rings all through which pass keys h.
The face 6 of the hopper forming the slide is pivoted upon a rod j and is pro-
vided at its lower portion with a tork in which the hook f" of the excentric f
is engaged. This excentric operates the slide 6 of the hopper by means of the
hook thereby impelling the fuel forward and compelling it to fall upon the
grate. This arrangement enables ready access to be had to the grate, either for
lighting the fire or for any other purpose. It is only necessary to remove the
hooks and the keys h in order to open the hoppers by turning them back like
an ordinary door. Charging thus being effected in a continuous manner, the fresh
fuel falls upon the front portion of the grate and never reaches the incandescent
portion. Combustion taking place immediately the fuel enters the furnace, the
gases and the smoke liberated traverse the combustion chamber where they are
consumed.
The mechanism of the charging apparatus comprises a shaft e supported by
two bearings e fixed upon the front of the furnace. This shaft is provided with
two excentrics f the straps of which are furnished with arms f" pivoted upon
the movable front or slide 6 of the hopper. This shaft e is actuated by means of
a cone pulley q, over which passes a belt rl, and gear wheels n.
Beneath the shaft e is arranged a shaft g upon which is fixed a helicoidal
pinion z gearing with a second helicoidal pinion fixed upon the shaft e.
On the shaft g is fitted an excentric the strap. of which is connected to the
lever P). This lever is pivoted at v upon a cross-piece v fixed to the supports and
is connected by means of a joint to a second cross-piece t which connects all
the bars of the inclined grate o. These bars consequently can all be given an
oscillating movement pivoting at o¹ o' upon the supports r.
At the bottom of the furnace is suitably arranged a lower grate i; a door m
gives access to this grate i.
A grate bar carrier which is hollow throughout its entire length and which is
embedded at each side in the masonry, is intended to retain the bars and to
protect them from the flames. Within this hollow beam are formed apertures in
such a manner as to establish an internal circulation of air which becomes heated
and mixes with the gases in order to consume the smoke.
Owing to the continuous oscillating movement of the hopper slides and charge,
the fuel descends gradually according as it is consumed, reaching the bottom of
the grate entirely consumed.
The scoria or clinkers cannot adhere to the grate owing to its movement, and
follow the same path as the fuel falling upon the lower grate i from which they
may be readily removed by the stokers through the doors m. Any pieces of coal
which may be carried down with the clinkers will be consumed.
By means of the driving mechanism the quantity of fuel which is to be burned
may be readily regulated.
In this manner uniform heating and perfect combustion of the fuel is obtained,
likewise coniplete consumption of smoke, great facility in heating and considerable
economy in fuel.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is-
-
A novel form of furnace for steam generators in which the fuel is supplied
to the grate by means of a mechanical charging apparatus consisting of a hopper a,
of a movable front or slide 6 for the same operated by means of excentrics f
which are rigidly connected with a driving shaft e; said shaft e also operating the
grate bars in such a manner as to cause them to oscillate through the inter-
mediary of helicoidal gear-wheels shaft g, said shaft g, by means of an
excentric, displaces a lever ? pivoted at vand connected to the grate by means
of a joint u, such grate being inclined and resting at its lower portion against a

page_text: grate bar carrier which allows the air to pass above a small grate i in such
a manner that this air, after it has become heated, mixes with the furnace gases
and assists in the combustion of the smoke, the whole substantially as described
and illustrated.
Dated this 20th Jo..
L1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.