Improvements in Internally Fired Steam Boilers.
Year: 1892

page_text: Date of Application, 20th Jan., 1892
Complete Specification Left, 20th Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Internally Fired Steam Boilers.
I, EDWARD BROOK, of 41 Spring Street, Huddersfield, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to steam boilers of the kind in which the furnace is
within the boiler and has for object to provide by simple means for more rapid and
effective combustion especially of comparatively cheap and poor fuel.
I dispense with a fire grate, and provide a metal tuyere or channel having wings
or side plates that rest on the lower lateral parts of the boiler tube or fluc in such
wise as to form a blast chamber in the lower part of the said tube.
The said tuyere or channel has openings in the upper part of its sides for the
distribution amongst the fuel of air and steam supplied under pressure by means of
a steam jet apparatus placed within the blast chamber. The front of the furnace.
or boiler flue is closed, and the fire is retained in place by a metal plate lined with
fire-brick or not; this plate is provided with the usual fire door and with openings
(kept closed whilst the furnace is at work) for removal of ashes and clinkers which
collect and rest upon the tuyere and wing plates.
As will be evident by my invention I am enabled to dispense with the usual ash
pit and therefore to obviate waste such as results from small fuel falling into such
pits.
The steam jet apparatus consisting of a steam nozzle and main tube having a
bell-mouthed or conical inlet with a diverging outlet is (by preference) attached to
the before mentioned front plate and placed so as to project into and be almost
entirely contained within the blast chamber, although it may be placed externally
aud connected to the blast chamber by pipes.
Dated this 20th 1
Lanman. 1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Internally Fired Steam Boilers.
I, EDWARD BROOK, of 41 Spring Street, Huddersfield, in the County of York
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:-
This invention has reference to steam boilers of the kind in which the furnace is
within the boiler and has for object to provide by simple means for more rapid and
effective combustion especially of comparatively cheap and poor fuel.
I dispense with a fire grate, and provide a metal tuyere or channel having wings
or side plates that rest on the lower lateral parts of the boiler tube or flue in such
wise as to form a blast chamber in the lower part of the said tube.
The said tuyere or channel has openings in the upper part of its sides for the
distribution amongst the fuel of air and steam supplied under pressure by means of
a steam jet apparatus placed within the blast chamber. The front of the furnace
or boiler flue is closed, and the fire is retained in place by a metal plate lined with
fire-brick or not; this plate is provided with the usual fire door and with openings
(kept closed whilst the furnace is at work) for removal of ashes and clinkers which
collect and rest upon the tuyere and wing plates.

page_text: As will be evident by my invention I am enabled to dispense with the usual ash
pit and therefore to obviate waste such as results from small fuel falling into such
pits.
The steam jet apparatus consisting of a steam nozzle and main tube having a
bell-mouthed or conical inlet with a diverging outlet is (by preference) attached to
the before mentioned front plate and placed so as to project into and be almost
entirely contained within the blast chamber, although it may be placed externally
and connected to the blast chamber by pipes.
In the accompanying illustrative drawings,
Fig. 1 is a front elevation of an internally fired steam, boiler according to this
invention;
с
Fig. 2 is a vertical transverse section; and
Figs. 3 and 4 are respectively a vertical longitudinal section and a horizontal
section of the same.
1 is the tnyere or channel, which extends from the front plate a few feet along the
boiler tube, the usual fire-brick bridge being provided at the far end. The tuyere or
channel (hereinafter referred to as a channel) is formed with wing plates 2 that
rest upon the lower lateral parts of the boiler tube, and form a blast chamber 3
below. The upper parts of the sides of the channel 1 are provided with openings 4,
through which air and steam are admitted to the furnace from the blast chamber 3.
The air is induced by means of a steam jet apparatus comprising a steam
nozzle 6, and a main tube 6* having a conical or bell-mouthed inlet and a
diverging outlet. The steam jet apparatus is (as I prefer) arranged within the
blast chamber as in the apparatus described in the Specification of my Patent
No. 2882 of 1879 and secured to the front plate by a flange and bolts but although
this arrangement is very compact, it is not necessary for the proper working of my
improved furnace. As the openings 4 are some inches above the wing plates 2,
the ashes and clinker may be allowed to collect for a considerable time without
interfering with the free passage or access of air to the fire, thus giving great
practical advantages over an ordinary grate, the interstices between the fire bars
of which begin to be choked as soon as the fire is lighted.
For the removal of ashes and clinker, openings are provided in the front plate.
These openings are closed by swinging doors 5,5", as shewn in Fig. 1, whilst the
furnace is at work. The whole of the ashes, however small, as well as the clinkers,
collect upon the channel and wing plates and there is consequently no dropping
through or waste of small fuel, and therefore no necessity for any ashpit or access
thereto.
The front plate 7 has the usual fire-door for charging the fuel, and is secured to
the boiler by any convenient means, such as bolts..
In consequence of the absence of any ashpit, I am enabled to place the channel
low down in the boiler tube, and thus obtain a very thick fire, so that in fact
the furnace is made to become in the ordinary acceptation of the term a "gas
producer."
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. In an internally fred steam boiler in combination with steam jet apparatus
for supplying air to the fire a metal tuyere or channel provided with wings or side
plates and having openings in the upper part of its sides, such tuyere or channel
being arranged within the boiler tube or flue substantially as described with
reference to the annexed drawings.
2. In an internally fired steam boiler a metal tuyere or channel constructed
substantially as hereinabove described and arranged within the boiler tube or flue
as set forth in combination with a steam jet apparatus, substantially such as
hereinabove described and illustrated the said steam jet apparatus being disposed 5
chiefly within the blast chamber.

page_text: 3. In an internally fired steam boiler the combination of parts constituting the
improved furnace constructed arranged and operating as shewn in and described
with reference to the drawings.
Dated this 15th day of September 1892.
EDWARD BROOK.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.