Improvements in Furnaces of Steam Generators.
Year: 1890

page_text: Date of Application, 12th Sept., 1890
Complete Specification Left, 11th June, 1891-Accepted, 11th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Furnaces of Steam Generators.
We HENRY JOSEPH BARRETT of Kingston-upon-Hull in the County of York,
Commission Merchant, and WILLIAM RUMBLE, also of Kingston-upon-Hull,
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to prevent smoke being made, and thereby to
effect a great economy in fuel.
The smoke seen issuing from chimneys is unconsumed carbon, the result of
imperfect combustion of the fuel, and to be successful in obviating this great waste
of fuel, the formation of smoke in the furnace of the boiler should be prevented.
It is unnecessary to refer to the many methods that have been proposed to prevent
smoke, and we will therefore proceed to describe our invention.
The invention is applicable to all kinds of furnaces, whether of fixed engines,
locomotive, or marine engines.
In carrying out this invention, waste steam is employed to create a vacuum
below the ash pit, whereby a rush of air through the fire will be caused, thus
feeding the fuel with the necessary oxygen to produce perfect combustion. The
steam is conveyed from the generator to the back of the fire by a pipe, the
perforated end of which is carried across and under the grate bars at a distance of
about eight inches along the whole width of the firing area, and the jets of steam
are sent through the holes in the pipe directly into the fire before the smoke is
produced.
A. suitable valve is attached to the pipe, which enables the fireman to regulate
the quantity of steam to be sent through the jet holes; the size of the pipe and
holes are dependent on the size of the boiler; a 50 horse power boiler would
require a pipe about 2 inches in diameter.
By injecting useless steam from the exhaust pipe of the engine, the velocity of
its passage through the holes of the injecting pipe at the end of the furnace,
causes a partial vacuum under the grate bars; the effect of this is a rush of
additional oxygen into the end of the furnace, and a thorough combustion of the
fuel on its leaving the furnace.
The same object may be effected by fixing a blast fan for forcing air through
the inject holes instead of steam, but this would involve a cost of steam power;
also an arrangement for shafting, pulleys, and strap for driving it.
For marine boilers, a pipe is carried across the front of all the boilers, and
connected with each fire box, and attached to an injecting pipe at the end, as
already described in the land boiler arrangement; the centre boiler may be the
most convenient to take the steam from.
In nearly all steam ships there is at least one donkey engine, and the steam
might be taken from that boiler instead of the main boiler, or it might also be
used for driving a blast fan, if it was found more convenient than steam, altho'
cold air would not be so effective as steam.
Steam from the donkey boiler could be applied as soon as the fires in the main
boilers are lit, and the donkey steam cut off as soon as the pressure of steam in
the main boilers was ready.
Dad thin 10th d
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NEWTON & SON,
Agents for the Applicants:

page_text: Improvements in Furnaces of Steam Generators.
We HENRY JOSEPH BARRETT of Kingston-upon-Hull in the County of York,
Commission Merchant, and WILLIAM RUMBLE, also of Kingston-upon-Hull,
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 :-
The object of this invention is to consume the smoke in furnaces which must
necessarily be produced when stoking, and thereby not only effect economy in fuel,
but also avoid the pollution of the atmosphere. It is well known that the smoke
seen issuing from chimneys which pollutes the atmosphere, is unconsumed carbon,
the result of imperfect combustion of the fuel; and to be successful in obviating
this nuisance and waste of fuel, the formation of the smoke in the furnace should
be prevented as far as it is possible, and any smoke that may be produced should
be consumed before it leaves the furnace.
"It is unnecessary to refer to the many methods that have been proposed to
prevent smoke, and we will therefore proceed to describe our invention, which is
applicable to all' kinds of furnaces.
In carrying out this invention, we employ jets of steam so arranged as to play
upon the incandescent part of the fire. The steam, upon coming into contact with
the incandescent fuel, becomes decomposed, and produces a gas of great heating
power, which is there and then burned, consuming any smoke that may have been
formed 'when fresh fuel is added to the fire. The inrush of the steam will also
serve to increase the quantity of oxygen supplied to the fire, by producing a
partial vacuum in the ashpit, whereby the air to support combustion will be caused
to enter at a greater velocity, and in greater volume than heretofore, so that, for
this reason, improved combustion will be effected, and the formation of smoke more
or less obviated.
The steam is conveyed from the generator or other source by a pipe, the end
of which, provided with 'suitable nozzles, is carried across under the grate bars
and near the fire bridge the whole width of the grate; the nozzles being arranged
to enter just between the bars, so that the steam will pass directly into the fire.
A suitable valve is attached to the steam pipe, which enables the fireman to
regulate the quantity of steam to be introduced.
In the accompanying drawing,
Fig. 1 is a fongitudinal section of so much of a steam generator with two
furnaces or fire holes, as is required to demonstrate our invention.
Fig. 2 is a plan, partly in section, and Fig. 3 is a front view of the same.
A is the furnace, B the ashpit, and C the bridge. In the ashpit of each furnace
is a pipe D, provided with a series of nozzles correspónding to the number of spaces
between the grate bars. The pipe D is placed transversely of the ashpit, below
the grate bars, and within about 8 inches of the bridge, with the nozzles just
entering the spaces between' the bars. The pipe D is in connection, by means of
the pipe D', with the steam space of the boiler, or with the exhaust, 'a suitable
valve being provided by which the flow of steam may be regulated according to
requirements by the man in attendance.
+
"In addition to consuming the smoke, and thereby producing economy in the
amount of fuel used, and preventing the pollution of the atmosphere, we obtain
greater heating power by the use of our invention, and are enabled to get up steam
more rapidly than heretofore.
In some cases we may find it desirable to close in the ashpit by means of a
hanging door or shutter E (see Figs. 4 and 5), air to support combustion being
admitted through an opening E' in the door provided with a regulating damper or
slide, and a tubular nozzle F, to give direction to the entering air, which will

page_text: become more or less heated before passing to the fire, thus serving to improve the
combustion, as is well known.
We may also connect the steam nozzles with an air reservoir or heating coil,
so that cold or hot air may, if desired, be injected into the incandescent fuel
mixed with the steam, in addition to the air entering in the ordinary way. The
construction and action of injectors is now so well known, that it is unnecessary to
further describe this arrangement.
It will be understood that we do not confine ourselves to the type of generator
shewn in the drawings, or to the form of grate, which are shewn merely by way of
example, as the invention may be applied to all kinds of steam boiler furnaces,
and any form of grate, with the necessary modifications, which will be obvious to
any skilled workman.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The method of improving the combustion of the fuel in furnaces of steam
generators as herein described, and consisting in causing jets of steam to enter
between the grate bars from below, and play upon the mass of incandescent fuel
in the grate, thereby producing a partial vacuum, by which an increased supply of
air to support combustion is drawn in, and decomposing the steam, which, con-
verted into an inflammable gas of great heating power, produces, with the
increased supply of air, perfect combustion of the fuel, as set forth.
2. In furnaces for steam generators, the use of jets of steam injected from
below into the incandescent mass of fuel in the grate, as and for the purpose set
forth.
1. T 1001
NEWTON & SON,
Agents for the Applicants.