Improvements in Steam-boiler and other Furnaces.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Steam-boiler and other Furnaces.
MATTHEW DAVISON, of 13, Lawson Street, North Shields, Ironfounder, and
WILLIAM FENWICK REED, of Preston Village, North Shields, Engineer, do hereby
declare the nature of this invention to be as follows:-
-
The backbridge is fitted with one or more chambers, together or separately, so
arranged as to be a superheater to the air, which is carried thereto by hollow
bars or tubes (or otherwise). The air is heated to such a degree and distributed
by the perforated arch & top plate as to ignite & burn all carbonaceous gases.
The said arch may be constructed of any suitable material such as asbestos, cast
or wrought iron, & placed immediately above or behind the backbridge, or in
any suitable position in the fire tube or combustion chamber.
The air is regu-
lated on its admission by the tubes or bars as the case may be. The perforated
arch is to work simultaneously with the backbridge or separately as may be
required, according to the construction of the furnace, and may be applied to
any kind of stationary, locomotive or marine boilers, or any furnace for other
than steam-generating purposes.
D
1
.
1000
MATTHEW DAVISON.
WM. F. REED.
Improvements in Steam-boiler and other Furnaces.
MATTHEW DAVISON, of 13, Lawson Street, North Shields, Ironfounder, and
WILLIAM FENWICK REED, of Preston Village, North Shields, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
--
Our invention consists of a backbridge so constructed with air chambers &
hollow arch above same to go around the furnace crown or immediately behind
the crown of furnace & parallel thereto & in the combustion chamber as the
construction of the boiler will permit. The apparatus thus placed in either posi-
tion receives atmospheric air from two pipes leading from the front, one at either
side of the furnace, or by hollow bars or by trellis consisting of holes and slide
to regulate the air into the backbridge which is so constructed as to form a
chamber at each side. The air from these chambers passes in two or more
chambers as is expedient, these chambers being arranged to form a circulation
of the air before entering the arch. The air is emitted through perforations in
the said arch into the furnace, meeting the carbonaceous gases which are passing
гD 971

page_text: under it. The back chambers of the bridge attached thereto receive air from
the same source heating it in the same manner by circulation & emitting it
through perforations on the top or back of the uppermost chamber, meeting the
gases from the underside in the same manner & intermingling with them as
they pass over the bridge, igniting these gases & so causing a more perfect com-
bination & at the same time causing an induced draught to the furnace. In
proportion to the gases consumed so is a saving of fuel effected. In case of need
to facilitate quick steaming & cause forced draught, this apparatus is fitted with
a small steam pipe entering the air pipes by a jet at the front & regulated by a
valve. The arch & backbridge may be made of any suitable material such as
cast or wrought iron, fire clay bricks, or asbestos, built or moulded to shapes suit-
able for the different construction of the boilers to which this may be applied.
We have illustrated our invention by the accompanying drawings, showing the
same as applied to marine or Cornish boilers.
Fig. 1 is a section through the back end of a furnace showing a portion of the
bridge with chambers & arch & the lower rows of tubes. Fig. 2 is a back view
of the backbridge, chambers & arch. Fig. 3 is a front view of bridge & air
courses with a steam jet attached. A is the furnace, B the combustion cham-
ber, C the lower rows of tubes, D the air pipes conveying the air to the cham-
bers E of backbridge, F. F, are the chambers above & attached thereto, G is the
arch & air outlets, H, H are the pipes leading from the chambers' E to the back
chambers, LI which are attached to the back of backbridge, J.J are the steam
pipes & jet. In both instances the air passes into the chambers of backbridge
through tubes 1) either by natural or forced induction by steam pipe J, and is
then heated by traversing through the before mentioned chambers. The arrows
show the direction taken by the gases & other products of the furnace into the
combustion chamber & return tubes: they are ignited by coming in contact with
the heated air from the arch & backbridge, thus forming a more perfect com-
bustion & decreasing the volumn of smoke.
Our apparatus may be applied in different forms of construction to any type
of boiler other than illustrated, being fitted in each case so as to intermingle the
rarified air with the flame gases & other products of combustion.
Having now particularly described & ascertained the nature of the said
invention & in what manner the same is to be performed we declare that
what we claim is:
1. The improvements in consuming gases in furnaces consisting in the appli-
cation of an apparatus situated above or behind the backbridge, so fitted in fur-
naces, forming a tubular arch into the interior of which atmospheric air is
received to be distributed in jets amongst the flame gases & other products of
combustion as they pass from the furnace on their way to the tubes or flues; the
air thus introduces burning the gases & causing economy of fuel by the more
efficient combustion substantially as described.
2. The gas-consuming apparatus adapted to an internally fired return tube
boiler comprising the hollow arch G perforated on underside communicating
with the hollow bridge E to which it is fixed, receiving the atmospheric air, &
delivering it to the apparatus G, burning the smokey gases; the whole com-
bined, constructed & operating substantially as described, & illustrated on the
drawing.
Dated this 17h love of 1000