IMPROVEMENTS IN FURNACES
Year: 1884

page_text: ROVISIONAL SPECIFICATION.
We, ROBERT WELFORD, of Hunter's Hall, Durham Road, Sunderland, in the
County of Durham, Engineer, and WILLIAM WELFORD, of Number 3, Park Terrace,
Sunderland, aforesaid, Engineer, do hereby declare the nature of said Invention
for "IMPROVEMENTS IN FURNACES" to be as follows:-
In a furnace according to this invention the firebars consist of water tubes with
internal circulating pipes, both sets of tubes communicating at one end with a
main circulating vessel or box, or each set communicating with an independent
vessel or box. These vessels or boxes are in communication with the main body of
water in the boiler in such a way that there is a continuous circulation through the
firebars. If only one vessel or box be employed the circulation may be facilitated,
by the use of a diaphragm or partition to separate the entering and effluent
currents.
Air is admitted to the furnace in a more or less heated state by means of
shutters placed in an oblique position. These intercept the radiant heat from the
fuel and also act as firedoors or are fixed in the firedoor. They are arranged like
venetians or louvres, and are provided with means for opening, shutting, and fixing
them. The air to support the combustion in the furnace may also be admitted in
the usual way, or in the manner described in our specification dated the 14th day of
February 1884 and numbered 3302 or in any other convenient manner according
to the requirements of particular cases, the arrangement of the water tube tirebars
remaining the same. These bars, although particularly applicable to the furnaces
of steam boilers, may be also applied to furnaces for other purposes than raising
steam or boiling liquids. In such cases they need to be provided with 'special
vessels or reservoirs of circulating water.

page_text: .
COMPLETE SPECIFICATION.
We ROBERT WELFORD of Hunters Hall -Durham Road Sunderland in the
county of Durham Engineer and WILLIAM WELFORD of 3 Park Terrace Sunderland
Engineer do hereby declare the nature of our invention for IMPROVEMENTS IN
FURNACES, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
In a Furnace according to this invention the Firebars consist of Tubes (closed at
one end) containing internal Tubes (open at both ends) for circulating water, both
sets of Tubes communicating at one end with a main circulating vessel or box or
each set communicating with an independent vessel or box. The vessel or boxes
are in communication with the body of-water (in the Boiler) in such a way that
there is a continuous circulation through the Firebars. If only one vessel or box is
employed the circulation is facilitated by the use of a diaphragm or partition to
separate the entering and effluent, currents. Air may be admitted to the Furnace
above the Fuel by means of Shutters placed in an oblique position. These
intercept the radiant heat from the Fuel and also act as Firedoors, or are fixed
in the Firedoor. They are arranged like Venetians or Louvres and are provided
with means for opening, shutting, and fixing them in any required position. The
air to support combustion is admitted in the usual way or in the manner described
in our Specification dated the 14th day of February 1884 and numbered 3302 or in
any other manner according to the requirements of particular cases the arrangement
of the water tube Firebars remaining the same. These Bars although particularly
applicable to the Furnaces of Steam Boilers may be also applied to other purposes
than raising steam or boiling liquids, as for instance the Grates of Furnaces for
melting Glass and in such cases they need to be provided-with special vessels or
reservoirs for circulating-water. To enable a Tube to be replaced one or more.inlet
and outlet Valves or their equivalent are provided at the ends of Pipes so as to.
shut the water off from the Tubes.
If desired several inlet and outlet connections may be fixed leading to different
parts of the Boiler and the Feed-Water may be introduced through the Tubes if
desired. We also prefer to make the Tubes within the Fireplace of oblong form so
as to secure a better draught.
We will now proceed to describe our invention by the aid of drawings:-
Fig 1. is a front view of an ordinary Boiler Furnace fitted with the Bars, the
circulating box door being removed.
Fig. 2 is a longitudinal section of the Grate.
J
Like letters indicate similar parts.
A are the Pipes conveying the effluent currents from the outer Tubes D. B are
the Pipes conveying the entering currents to the internal Tubes C. The outside
Tubes D are closed at their far ends, the inside Tubes C being open at both ends.
E is a Deadplate under which the Tubes taper from an oblong form to a circular
form. The round form being suitable for securing the Tubes to circulating Box
and Diaphragm plate respectively. The Tubes are of oblong form for the distance
whereupon the outer Tubes D carry the Fuel or where they are in the Fireplace.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
Constructing the grate Bars of Furnaces of hollow Tubes containing internal
Tubes and arranging the circulation of water substantially as described.
ROBERT WELFORD.
WILLIAM WELFORD,