IMPROVEMENTS IN FURNACES
Year: 1882

page_text: LETTERS PATENT to John Imray of No. 28 Southampton Buildings Chancery
Lane in the County of Middlesex, for an Invention of IMPROVEMENTS IN
FURNACES. A communication to him from abroad by Claus Heinrich
Ferdinand Russmann of Hamburg in the German Empire.
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 9th August 1882.
JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County of
Middlesex << IMPROVEMENTS IN FURNACES" [A communication to him from
abroad by Claus Heinrich Ferdinand Russmann of Hamburg in the German
Empire.]
This invention relates to apparatus applicable to boiler and other furnaces for
obtaining great heating power and ensuring combustion of smoke. For this
purpose in the space above the fire grate is fixed a transversely zig-zagged pipe
lying at an inclination from the front downwards to the back which is immediately
over the middle of the fire grate. The interstices between the zig-zags of the pipe
are filled up with refractory material so that the whole forms a sloping shield over
the front half of the fire grate. Combustible gas or liquid hydrocarbon is fed into
the upper part of the pipe at one side of the shield and this becoming heated or
volatilised and heated by passing through the zig-zags issues from the upper part
of the pipe at the other side of the shield and is led by a pipe to a nozzle situated
in the ashpit. This nozzle directs the jet of heated combustible gas or vapor into
an aperture leading into a cavity which is formed of refractory material under the
hinder half of the fire grate, and which is open at the top, the jet carrying in with
it a quantity of air by injector action, so that a hot flame issues through the hinder
part of the fire grate-As the gases produced from the fuel in the front part of
the grate inust pass mostly under the hinder edge of the shield and meet this
flame, the smoke is effectually consumed. The nozzle above mentioned or the
aperture into which it directs its jet can be shifted nearer to or farther from one
another so as to regulate as desired the quantity of air drawn in with the jet, and
when the nozzle is thus made moveable it is connected with the zig-zag pipe by a
jointed or telescopic pipe.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Imray in the Great Seal Patent Office on the 7th February
1883.
JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County of
Middlesex "IMPROVEMENTS IN FURNACES" A communication to me from
abroad by Claus Heinrich Ferdinand Russmann of Hamburg in the German
Empire.
This invention relates to apparatus applicable to boiler and other furnaces for
obtaining great heating power and ensuring combustion of smoke. For this
purpose, in the space above the firegrate is fixed a transversely zig-zagged pipe
lying at an inclination from the front downwards to the back which is immediately
over the middle of the firegrate. The interstices between the zig-zags of the pipe
are filled up with refractory material so that the whole forms a sloping shield over
the front half of the firegrate. Combustible gas or liquid hydrocarbon is fed into
the upper part of the pipe at one side of the shield and this, becoming heated or
volatilised and heated by passing through the zig-zags, issues from the upper part
of the pipe at the other side of the shield, and is led by a pipe to a nozzle situated
in the ashpit. This nozzle directs the jet of heated combustible gas or vapour into
an aperture leading into a cavity which is formed of refractory material under the
hinder half of the firegrate, and which is open at the top, the jet carrying in with
it a quantity of air by injector action, so that a hot flame issues through the hinder
part of the firegrate. As the gases produced from the fuel in the front part of the
grate must pass mostly under the hinder edge of the shield and meet this flame,
the smoke is effectually consumed. The nozzle above mentioned or the aperture
into which it directs its jet can be shifted nearer to or farther from one another so
as to regulate as desired the quantity of air drawn in with the jet, and when the
nozzle is thus made moveable, it is connected with the zig-zag pipe by a jointed or
telescopic pipe.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a longitudinal section, Fig. 2 a front view partly in section and Fig. 3 a
sectional plan of a furnace according to this invention. In the fire place E over
the grate R and fire doors l', is situated the sloping shield D consisting of the
zig-zag pipe with refractory material m filled in between its limbs; a is the supply
inlet to a branch leading directly down to the lowest limb of the zig-zags and e is
the outlet from the highest limb communicating by jointed pipes pp with the
nozzle 8.
v is a branch forming communication between the higher and lower
limbs of the zig-zag pipe. The nozzle can be slid along a guide in a standard C
situated in the ashpit d, the jet from the nozzle 8 is directed into the mouth H
leading into a space K_whence the flame rises through the hinder part of the
firegrate R. The space K and its mouth H are formed in the refractory lining of
the casing o which can be introduced into the ashpit through an opening i at the
back. Air is admitted to the front part of the ashpit through an orifice n or by
opening the ashpit door d.
Having thus described the nature of the said invention and in what manner the
same is to be performed as communicated to me by my foreign correspondent,
I claim:
In combination with the firegrate and the fire space and ashpit of a furnace, the

page_text: heating shield D and its communications with the nozzle 8, the mouth H and flame
space K, constructed and operating substantially as and for the purpose herein
set forth.
In Witness whereof I the said John Imray have hereunto set my hand and
seal this Seventh day of February in the year of our Lord One thousand
eight hundred and eighty three.
JOHN IMRAY (L.S.)