Improvements relating to Steam Boiler and other Furnaces.
Year: 1899

page_text: Date of Application, 9th May, 1899
Improvements relating to Steam Boiler and other Furnaces.
I, EDWARD DIXON, of Princess Avenue, Hull, in the County of York, Manu-
facturer, and EDMUND HOWL, of the Quarries, near Dudley, in the County of
Worcester, Engineer, do hereby declare the nature of this invention to be as
follows:-
Our invention has for its object the construction and arrangement of fire grates
for forced draught steam boiler or other furnaces in such a manner as to ensure
great durability and effective combustion and to permit of ready inspection and
cleaning.
In the application of our invention to the furnace of an ordinary Cornish or
Lancashire boiler, we dispense with the usual solid fire bars and the separate
dead plate, and employ hollow bars of a box-like section extending the full length
of the furnace and projecting beyond the fire bridge. Each bar is thus supported
directly by the bridge near to its rear or inner end, whilst the outer ends of the
bars at the furnace mouth are supported by the insertion of such ends within
apertures through the furnace front. The front ends are free to slide within
the supporting plate under expansion and contraction.
The draught, which is forced preferably by means of a steam jet arranged at
the mouth of a conical air trunk or conduit, is admitted beneath the grate and
passes to the upper or fire side through the spaces between the hollow or box
like bars.
The front or outer end of each of the hollow or box like fire bars is open to the
atmosphere; the end beyond the bridge is closed but each bar is open on both
its upper and lower sides on the portion between the extremity and the fire
bridge. Thus when the furnace is in service a current of air passes through the
bars keeping them comparatively cool and preventing the adherence of clinker
and the burning away of the metal; the discharge of the air beyond the bridge
after it has become heated by passing through the entire length of the hollow
bars, ensures a more complete combustion and the prevention of smoke. The
closed inner extremity of the bars, beyond the fire bridge, is made of such a taper
or diagonal form as to deflect the hot air upwards to meet the gases coming over
the bridge; the lower opening in the hollow bars prevents the settlement of coal
or solid matter therein. The amount of air passing through the bars can be
regulated by the provision of any suitable damping device for varying the amount
of opening to be given at the admission apertures.
We make our hollow or box like furnace bars in such forms and patterns as
are best suited to the particular service for which they may be required.
n
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents for the Applicants.

page_text: Improvements relating to Steam Boiler and other Furnaces.
We, EDWARD DIxox, of Princess Avenue, Hull, in the County of York, Manu-
facturer, and EDMUND HOWL, of the Quarries, near Dudley, in the County of
Worcester, Engineer, 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:-
Our invention has for its object the construction and arrangement of fire grates
for forced draught steam boiler or other furnaces in such a manner as to ensure
great durability and effective combustion and to permit of ready inspection and
cleaning.
to.-
In the accompanying sheet of explanatory drawings to be hereinafter referred
Figure 1 is a sectional side elevation of a boiler furnace, having our invention
applied thereto, Figure 2 a sectional end elevation of the furnace, and Figure 3
a front elevation showing a portion of the front of a Cornish boiler within which
the furnace is fixed.
The same reference letters in the different views indicate the same parts.
In the application of our invention to the furnace of an ordinary Cornish or
Lancashire boiler, we dispense with the usual solid fire bars and the supporting
dead plate, and employ hollow bars as A of a box-like section extending the full
length of the furnace and projecting beyond the fire bridge B as illustrated.
Each bar is thus supported directly by the bridge near to its rear or inner end,
whilst the outer ends of the bars a at the furnace mouth are supported by the
insertion of such ends within apertures through the furnace front C. The front
ends are free to slide within the supporting plate under expansion and contraction.
The draught, which is forced preferably by means of one or more steam jets
as D arranged at the mouth of a conical air trunk or conduit as E, is admitted
beneath the grate and passes to the upper or fire side through the spaces between
the hollow or box like bars A.
The front or outer end of each of the hollow or box like fire bars is open to the
atmosphere; the end beyond the bridge is closed but each bar is open on both
its upper and lower sides on the portion between the extremity and the fire
bridge. Thus when the furnace is in service a current of air passes through the
bars keeping them comparatively cool and preventing the adherence of clinker
and the burning away of the metal; the discharge of the air beyond the bridge B
after it has become heated by passing through the entire length of the hollow
bars A, ensures a more complete combustion and the prevention of smoke. The
closed inner 'extremity of the bars, beyond the fire bridge, is made of a taper or
diagonal form as illustrated to deflect the hot air upwards to meet the gases
coming over the bridge; the lower opening in the hollow bars prevents the settle-
ment of coal or solid matter therein. The amount of air passing through the bars
can be regulated by the provision of any suitable damping device for varying the
amount of opening to be given at the admission apertures.
We make our hollow or box like furnace bars in such forms and patterns as
are best suited to the particular service for which they may be required.
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: -
1. In steam boiler and other furnaces, the use of fire bars of a hollow or box

page_text: like section throughout with front ends open to the atmosphere and inner ends
projecting and opening beyond the fire bridge, substantially as and for the
purposes described.
2. In steam boiler and other furnaces, the combination with a fire grate formed
by bars of a hollow or box like section throughout and open at their respective
ends for the admission of air from the front of the boiler and for the discharge
of the same beyond the bridge, with means for the supply through the spaces
between the said bars of a forced draught to the fire side of the grate, substan-
tially as described.
3. The improved fire grate for steam boiler and other furnaces, constructed
and arranged substantially as and for the purposes described and as illustrated.
Dated this 8th day of February 1900.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents for the Applicants.