Improvements in and relating to Boiler Furnaces, Iron and Steel Furnaces, and other Furnaces, and to the Fire Places of Brewers' Pans and Salt Pans.
Year: 1893

page_text: Date of Application, 11th Feb., 1893
Complete Specification Left, 11th Nov., '893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in and relating to Boiler Furnaces, Iron and Steel
Furnaces, and other Furnaces, and to the Fire Places of Brewers'
Pans and Salt Pans.
t
I, PETER LUCAS, of Ditchingham Street, Sheffield, in the County of York,
Furnace Builder, do hereby declare the nature of my invention to be as
follows:-
This invention relates to improvements upon my previous invention described in
the Specification of Patent No. 21,135, 1890, and extending the same to brewers
pans, salt pans and the like.
In its application to a steam boiler furnace for example, having one or more
flues, it may be briefly described as a closed fire or gas producer, the escaping
gases being ignited and consumed by mixing with a supply of air conveyed to and
passing out of the upper part of the bridge, the said air being heated in its passage
to the bridge.
The floor of the furnace is constructed of arched slabs of metal provided with a
number of air ports, and suitably held together to prevent displacement.
Underneath these perforated slabs or floor is a waved or curved plate reaching
from front to back of furnace, and across from side to side and thus dividing the
space under the furnace floor into a top and bottom chamber; the top chamber
being for the forced draught to the fuel and the lower one for the passage of air to
the bridge with which it communicates.
The upper or blast chamber, and the perforated slabs constitute a tuyere.
I propose in one arrangement to have a double or boxed front to the boiler flue,
in which the firing, slagging and other doors are fixed, and through which air is
admitted by means of a valve or swivel door, which may be opened and closed by
hand or automatically as preferred.
The air so admitted becomes heated in passing down to the lower chamber or air
passage before mentioned, on its way to the bridge.
In another arrangement I dispense with the boxed or double front and close the
front end of the lower chamber or air passage by a door which may be opened or
closed as desired by hand or automatically.
Outside air nozzles communicate with the closed front of upper chamber or
tuyere and a small steam jet is in connection with each air nozzle.
In either of the above arrangements I may build in the flues behind the bridge
an arrangement of brick work so constructed or put together as to cause the flame
and heated gases to take an indirect course before they escape to the chimney
stack.
In the application of my invention to salt pans and other furnaces, not being
steam boiler furnaces, modifications of the details of construction will be necessary,
and can be made without departing from the spirit of the invention.
Dated the 9th day of February 1893.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.

page_text: Improvements in and relating to Boiler Furnaces, Iron and Steel
Furnaces, and other Furnaces, and to the Fire Places of Brewers'
Pans and Salt Pans.
I, PETER LUCAS of Ditchingham Street, Sheffield in the County of York,
Furnace Builder 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 improvements upon my previous invention described in
the Specification of Patent No. 21,135" and extends the same to brewers pans, salt
pans and the like.
Its application to a steam boiler is illustrated in the annexed sheet of drawings
in which :-
Fig. 1, represents the front of a double flue boiler, one flue door frame being
removed.
Fig. 2, longitudinal section of furnace flue.
Fig. 3, topside of section of tuyere.
Fig. 4, underside of section of tuyere.
In its application as above mentioned, for example, it may be briefly described as
a closed fire or gas producer having a forced supply of air to the fuel, and the
escaping gases being ignited and consumed by mixing with a supply of air
preferably conveyed to a divided or hollow bridge so that it may be heated in its
passage, but air may be otherwise supplied if preferred.
Referring to the drawings, the floor of the furnace A, is constructed of arched
slabs of metal B, forming sections of a complete tuyere extending the whole length
or thereabouts of the furnace A. Each slab or section is constructed with a
number of air ports C, preferably arranged in angular positions to the right and
left as shown.
The slabs or sections are provided with lugs D, and pin E, or other equivalent
means for preventing displacement. These slabs constitute the floor of the furnace
upon which the fuel is laid.
Underneath this floor or tuyere of perforated slabs is a wall or curved plate F,
(but this form as shown may be varied) reaching from the front to the end of the
furnace, and across from side to side or thereabouts, the edges being in contact with
the slabs so as to form a joint and thus dividing the space under the slabs into a top
and bottom chamber G and H.
The top chamber G, is to receive the forced draught to the fuel, and the lower
chamber for the passage of air to the bridge L, with which in this arrangement it
communicates.
The upper air chamber and the perforated slabs constitute a tuyere. Instead of
carrying air to and supplying it from a divided bridge as described, I may admit it
through pipes from the front of boiler, or otherwise.
For the further heating of air supply to the bridge I fix over the entrance to the
boiler flue, a boxed front 1, in which the firing M, slagging N, and other doors are
arranged, and through which hollow front, air is admitted by means of a
valve J, conveniently placed and which may be opened and closed by hand, or by
any of the automatic means employed for such a purpose. The air so admitted
becomes heated in its passage downwards to the lower air chamber H, before
mentioned, which in this case as will be seen is closed by the front I, from the
outside cold air. I may however dispense with the boxed front I, and simply close
the entrance to the lower chamber H, with a door, which may be perforated or not
and may be opened and closed by hand or mechanically.
The doors of the furnace or the part of the box-front exposed to the furnace

page_text: may if desired be perforated to admit an auxiliary supply of air, with or without
means of regulation.
The boxed front I, may if desired be made to cover the furnace opening, the
front of the lower air chamber H, being closed by a door as above described.
Outside air nozzles J', communicate with closed chamber G, and a small steam
jet K, in connection with each produces a forced draught which blows through the
openings C, into the body of the fuel.
In combination with any of the above described apparatus I may use an
arrangement of brickwork so put together as to cause the flame and heated gases to
take an indirect course before it escapes to the chimney stack.
In the application of my invention to salt pans and other furnaces not being
those of steam boilers, modifications of the details of construction will no doubt be
necessary, and such can be made without departing from the spirit of the invention.
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. In a furnace, constructing the floor of arched slabs B, having air ports C, the
ports on one side of the ridge or centre line, pointing in one direction and those on
the opposite side pointing in the opposite direction, substantially as described and
shown.
2. In a furnace or like fire place constructing the floor or that part on which the
fuel is laid of perforated slabs such as B, and having a chamber or chambers formed
underneath either by a division plate such as F, or more than one if preferred, or
by other epuivalent means, for the admission of a forced blast, substantially as
hereinbefore described and shown.
3. In a furnace, the combination with a floor of slabs B, provided with air
ports C, and an underneath air chamber (or chambers) such as G, of a box front I,
enclosing the end of the furnace, provided with the necessary doors, and with an
inlet valve J, to admit air to be passed to the bridge; also with one or more steam
jets K, and air inlets J', to force air into the chamber or chambers G, substantially
as hereinbefore described and as shown.
Dated the 10th day of November 1893.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.