Improvements in the Construction of Mill Furnaces and in the Heating thereof.
Year: 1889

page_text: Date of Application, 17th Sept., 1889
Complete Specification Left, 8th May, 1890-Accepted, 12th July, 1890
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Mill Furnaces and in the
Heating thereof.
I HENRY NELSON of 75 Makin Road Attercliffe Sheffield in the County of York
Builder do hereby declare the nature of my said invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF MILL FURNACES AND IN THE HEATING THEREOF to be as
follows:-
"
In carrying this invention into effect I construct a furnace of brick having external
metal sides which are fixed in segments in grooved base plates. The furnace bottom
is brick built upon metal plates under which is a hot air chamber covering the whole
under surface; the top is also built of brick and arched, having open air ports from an
air chamber which is partly covered with metal plates.
The furnace is taper from the mouth in height to the end, and at the furthest end
thereof are hot air pipes fixed into the bottom chamber the air being blown in by means
of steam jets, which air passes into ports in the bridge at the producing or firing end
and forward into a hot air chamber between the double roof over the firing grate and
into the furnace; a portion passing over the top of the furnace and through the ports
in the roof.
The heat from the producer causes the gas to ignite through the ports in the
roof of the hot air chamber over the producer, and consumes its own smoke at the
same time.
The hot air is conveyed from the furnace to supply the boilers and then away.
By this invention less fuel is required and more heat gained in little time, and at
less cost, whilst the furnace will last longer and can be more readily repaired.
The heat is regulated by means of dampers and turning off the steam.
Dated this Thintoanth day of Santambor 1880
GARLICK & MCGOWAN,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Construction of Mill Furnaces and in the
Heating thereof.
I HENRY NELSON of 75 Makin Road Attercliffe Sheffield in the County of York
Builder do hereby declare the nature of my said invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF MILL FURNACES AND IN THE HEATING THEREOF "and in what
manner the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
This Invention relates to Improvements in the Construction of Mill Furnaces whereby
less fuel is required and more heat gained, in little time and at less cost, whilst the
furnace will last longer and can be more readily repaired.
In carrying this invention into effect I construct a furnace of brick having external
metal sides and top, which are fixed in segments in grooved base plates. The furnace
bottom is built of brick upon metal plates under which is a hot air chamber covering
the whole of the under surface; built in this chamber are brick walls or divisions for
the purpose of retaining the heat therein as shewn in the drawings. The roof is
arched and built of brick having open air ports from an air chamber above it, which
is covered with metal plates; in these said plates are openings having lids to be able
to have access to the ports in the said brick roof.
The furnace is taper from the mouth in height to the end, at which end are two

page_text: hot-air pipes fixed into the bottom chamber, one on either side of the furnace, the air
is blown in by means of steam jets part of which air passes in serpentine form round
the walls built in this chamber into ports in the bridge at the producing or firing end,
and forward into a hot air chamber over the firing grate and into the roof, then
through the ports into the furnace and the remaining portion up a hot-air flue running
at the back and all meeting in the above mentioned chamber over the firing grate,
these two currents of air are divided when they come into the bottom chamber, by
means of a V partition built as shewn by the accompanying drawings.
The heat from the producer causes the gas to ignite as it passes into the furnace
through the ports of the hot air chamber over the firing grate, this action of
combustion causing it to increase the heat and consume its own smoke at the same
time.
The heat can be regulated to suit any carbon by either turning off the steam or
opening a flue in the roof. Fixed in front of the furnace are two small doors into the
hot air chamber to be able to see the heat of the furnace.
This invention is also applicable to the heating of boilers either vertical or horizontal
which require less fuel, give greater heat, generate more steam, and consume its own
sinoke by applying a hot air pipe running from the back or end of the boiler
underneath it, and connected to pipes passing under each fire grate and into a hot air
chamber fixed at the back of each fire grate having ports through which the hot air
may pass into the fire hole or tube of the boiler as shewn in the accompanying
drawings the combustion taking place as above described.
In being able by this invention to regulate the heat rolled bars or ingots placed in
the furnace are so heated and soaked to suit their carbon making them much easier to
roll and work.
This invention may be applied to almost every kind of already existing furnaces or
boilers.
The following is a description of my invention with reference to the drawings of the
furnace.
A are the plates of the sides, A¹ are the plates of the top, B the openings in the top
plates to be able to have access to the ports in the roof D, of the furnace, E is the brick
bottom resting upon plates F having underneath an air chamber G in which are built
partition walls H. To supply the hot-air chamber G with hot air is an inlet tube I,
which supplies hot air to the bridge J through ports K, into the double roof L
over the firing box M, and into the roof D and through the ports O into the
furnace P.
To further supply the furnace with hot air it passes down an inlet Q and is divided
by a shaped brick division R which supply partly passes into the bottom chamber G
whilst the remaining portion goes up the hot air pipe S into the bridge L.
When the hot air is collected in the said bridge L it passes through ports T into the
furnace and is ignited causing combustion.
Placed at the top of the furnace is an outlet U for regulating the heat, also two
small doors V fixed in the front of the furnace to see the heat. W is shewing an ingot
in the furnace and X are the furnace doors.
In applying this invention to boilers as a smoke consumer together with the
before named advantages letter B₁ shews the hot air supply pipe to the fire grate C
feeding the hot air chamber D' at the back of fire box E¹, the air passing through
ports E into, and being ignited in the fire hole of the boiler.'"
The accompanying drawings illustrate my invention the same letters of reference
applying to the different views:-
Fig. 1 is a side view in section.
Fig 2 is a plan in section.
Fig 3 is an end view in section.
Fig. 4 is a front view showing the application to boilers as a smoke consumer

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Firstly. Improvements in the construction of mill furnaces and in the heating
thereof, by the application of hot air conveyed in pipes and chambers and passing
through ports by means of steam jets, the said ports being placed in such a position
that the fire may strike the gas and cause combustion without smoke.
Secondly. The said furnace is so constituted that it lessens the cost, will last longer,
produce more work in less time, and heat any ingot according to the carbon, enabling
it to be worked or rolled easily.
Thirdly. In applying the same construction or similar to the fire boxes of horizontal
or vertical boilers which application gives greater heat, lessens the cost, generates
more steam, and consumes its own smoke.
Fourthly. Improvements in the construction of mill furnaces and in the heating
thereof as hereinbefore described and as illustrated by the accompanying drawings.
Dated this 20th day of Anil 1800
GARLICK & MCGOWAN,
Agents for the Applicant.