Improvements in or relating to Furnaces.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnaces.
I, JOSEPH REED, of Daybrook Works, Daybrook, in the County of Nottingham,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in boiler and other furnaces in which
hollow or tubular fire-bars are employed and it has for its object to obtain greater
efficiency in working, and a more perfect smoke consumption than heretofore.
In carrying out this invention the rear ends of the hollow or tubular bars are
carried into or placed in communication with a transverse chamber, built into or
formed integrally with, or placed near the bridge.
From this chamber the heated air, which is delivered into it from the fire bars, is
conveyed by preferably two or more tubes or passages to the front of the furnace
where it is delivered over the fire.
The tubes or passages which convey the air from the chamber at the back of the
bridge, to the front, may be carried either under the fire bars and through openings
in the front of the furnace, or in the dead plate, through the interior of the furnace,
or be built into the walls thereof. In all cases the point of delivery of the hot air,
at the front of the furnace is preferably arranged above the fire and in a position
that will give the best results.
In order that the heated air from the fire bars may be delivered at the front of
the furnace as described and also at the back of the furnace or at the bridge
according to the condition of the fire or its requirements from time to time, the
chamber at or near the bridge is provided with outlets, which are fitted with regu-
lators of suitable construction, in order that they may be opened or closed as
required.
When the outlets in the chamber are open the hot air from the fire-bars is
delivered directly into the flue, when they are closed the air is conveyed to and
delivered over the front of the fire by the before mentioned tubes or passages.
By providing the latter with intakes or openings at the front communicating with
the exterior of the furnace, the said tubes or passages may be employed for heating
and delivering air at the bridge, as well as the fire bars. The intakes or
openings in the tubes or passages are fitted with doors or regulators so that they
may be closed in order to convey the hot air in the reverse direction.
The arrangement described may be used in connection with either a natural or
forced draught.
In the latter case the intake of or the fore ends of the fire-bars may be in com-
munication with a closed ash-pit, or a closed chamber placed at the front of the
furnace preferably under the dead plate in which a forced or artificial draught may
be obtained by means of a steam injector jet or a blower connected thereto.
Dated this 4th day of November 1897.
BOULT & WADE,
Agents for the Applicant

page_text: Improvements in or relating to Furnaces.
I, JOSEPH REED, of Daybrook Works, Daybrook, in the County of Nottingham,
Engineer, do hereby declare the nature of this invention, and in what nianner
the same is to be performed, to be particularly described and ascertained in
and by the following statement :—
This invention relates to improvements which are applicable to boiler and other
furnaces in which hollow or tubular fire-bars are or may be employed, and its object
is to give greater efficiency in working, and a more perfect smoke consumption than
heretofore.
a
What is herein referred to as a tubular or hollow fire-bar, is a bar having.
longitudinal air passage, formed either by casting a tube or tubes therein, or casting
it hollow in a well known manner.
The invention will be best understood by reference to the accompanying drawings,
in which
Fig. 1 is a longitudinal section showing my invention applied to a steam boiler
furnace
Fig. 2 is in part a front elevation showing the furnace door removed, and the
remainder a section taken on the line X X of Fig. 1.
Fig. 3 is a longitudinal section, and
Fig. 4 in part a front elevation showing the furnace door removed, and the
remainder a section taken on the line Y Y of Fig. 3 showing an alternative
arrangement.
Like letters indicate like parts, throughout the drawings.
In carrying out this invention the rear ends of the hollow or tubular fire bars A,
(see Figs. and 2) or the tubes A2 cast therein, are carried into or placed in
communication with a transverse chamber B, preferably built into or formed
integrally with the ironwork of the bridge.
From the chamber B, the heated air, which is collected by said chamber from the
interior passage in each of the fire-bars A, is conducted by preferably two pipes or
conduits C to the front of the furnace, where it is delivered preferably at a point
above the fire.
The tubes or conduits C may be carried either under, or over the fire-bars, or in
the case of a furnace with brick or like walls they may be built into or formed in the
said walls of the furnace.
As shown in the drawings the pipe or conduits C are carried under the fire-bars,
and their fore ends C¹ are connected to the dead-plate D at points where suitable
openings D¹ (see Fig. 2) are formed in the said plate, and through which openings
the air is delivered either directly into the furnace or into an arch shaped casing or
chamber E, the two extremities of which rest on the dead-plate D over the
opening D¹.
From the casing or chamber E the heated air is delivered through an opening E¹,
or one or more openings formed at other suitable points in its inner wall, into the
furnace.
Instead of the casing or chamber E, suitable delivery pipes or nozzles which are
.connected to the pipes or conduits C may be employed, for delivering the heated
air from the said pipes or conduits into the furnace at the furnace at the required
points.
In order that the heated air from the fire-bars A may be either delivered at the
front of the furnace as described, or at the back of the bridge as required, say
according to the condition of the fire from time to time, the chamber B may be.
provided with openings B¹ (see Fig. 1) in the rear wall of the said chamber, which

page_text: openings may be closed, by a sliding grating F which forms together with the wall
of the chamber B, a regulator of the well known hit and miss type.
When this regulator is open the hot air is delivered from the chamber B directly
into the flue at the bridge as at the present time, and when it is closed the heated
air is conveyed to and delivered at the front of the furnace by the pipes or conduits
C as previously described.
The arrangement described may be used either with a natural or forced draught.
In the latter case the intake ends of, or the fore ends A¹ of the fire-bars A may be
in communication with a closed ash-pit, in which case a forced draught may be
maintained both through the bars, and through the furnace.
In order however to obtain a forced draught through the hollow or tubular bars
only or independently of the furnace, I may employ a steam jet in each of the pipes
or conduits C the delivery nozzles G of which are placed at any convenient point in
the length of each of the said pipes or conduits as shown in Figs. 1 and 2.
Or as shown in Figs. 3 and 4 I may make the dead-plate in the form of a
transverse casing or chamber J into which the fore ends A¹ of, or the tubes A² of
the bars A project, and convey air from a fan or blower by means of a main pipe H,
which may extend across the front of 3 battery of furnaces, the hollow dead-plate
or casing in each case being connected by one or more branches H¹ to said main
pipe.
Each branch H¹ (see Fig. 3) is fitted with a sliding door or damper I, so that
the air from the main pipe H may be regulated or entirely cut off as required.
When a hollow-plate J is employed as shown in Figs. 3 and 4, the heated air
from the pipes or conduits C is conveyed across the hollow space by hollow
casing D¹, which are preferably formed integrally with the hollow dead-plate J.
If preferred 1 may pass the air through the fire-bars A and pipes or conduits C,
in the reverse direction to that prescribed.
In this case I form the pipes or conduits C with their fore ends C¹ open to the
atmosphere and place the steam jet nozzle G in each pipe or conduit C so that they
will blow in the reverse direction, that is, towards the rear. The air is then first
collected by the pipes or conduits C and delivered into the chamber B, from the
latter it passes through the bars A to the front and into a hollow dead-plate J such as
is shown in Figs. 3 and 4. The interior of the latter is in this case placed in
communication with the interior of the furnace or a casing E, or suitable delivery
pipes may be connected thereto. The heated air is in this arrangement delivered
over the fire as in the arrangements previously described.
When a forced draught, obtained by means of a fan or blower used in connection
with this arrangement, the main pipe H previously referred to is connected to the
ends C¹ of the pipes or conduits C, instead of the dead-plate casing J, whilst the
pipes or conduits C are only connected to the chamber B.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
1. In a furnace collecting the heated air from the rear ends of hollow or tubular
fire-bars and conducting it to and delivering it at or near the front of the furnace
substantially as described.
2. In a furnace conveying air in pipes or conduits from the front of the furnace
to the rear ends of the hollow or tubular fire-bars and back through the latter and
delivering it at or near the front of the furnace substantially as described.
3. In a furnace the combination with hollow or
tubular fire-bars such
as A of a collecting chamber such as B and pipes or conduits such as C for
conveying the heated air to and delivering it at or near the front of the furnace
substantially as described.
4. In a furnace the combination with hollow or tubular fire-bars such as A of a
collecting chamber such as B one or more pipes or conduits such as C for conveying
the heated air from the chamber C to the front of the furnace either in connection

page_text: with or without a steam jet and a casing such as E or delivery pipes for conveying
the heated air from the pipes or conduits C to the required point within the furnace
substantially as described.
5. In a furnace the combination with hollow or tubular fire-bars such as A of a
hollow dead-plate casing such as J connected to a fan or blower a collecting
chamber such as B pipes or conduits such as C for conveying the heated air to and
delivering it at or near the front of the furnace substantially as described.
6. In a furnace the combination with hollow or tubular fire-bars such as A of a
chamber such as B one or more open ended pipes or conduits such as C for
delivering air into the said chamber either in connection with or without a steam
jet a hollow dead-plate casing such as D to collect the air from the bars A and
deliver it direct into the furnace or through a casing E or delivery pipes substantially
as described.
7. The combination and arrangement of parts constituting the complete furnace
substantially as described and illustrated in Figs. 1 and 2 or Figs. 3 and 4 of the
accompanying drawings.