Improvements in Steam Boilers.
Year: 1896

page_text: Date of Application, 29th Dec., 1896-Accepted, 27th Feb., 1897
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
I, THOMAS SCOTT, of 20 Hastings Road, Ealing, in the County of Middlesex,
Marine 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 objects of this invention are:-Firstly, to provide means whereby complete
combustion of the gases given off from the fuel may be effected before they enter
the uptakes and funnel, thereby preventing the flaming of gases at the top of the
funnel and producing a more economical steam generator than either the ordinary
water-tube or the ordinary fire-tube boiler, both as regards wear and tear, including
the burning out of the uptakes, and consumption of fuel.
Secondly, to produce a boiler which shall have a very large amount of effective
heating surface in proportion to the space occupied by the boiler, and thirdly to
produce a boiler of simple construction, affording great facility for replacing tubes,
cleaning and examining.
For these purposes 'make the boiler partly as a tubulous-boiler, and partly as
a tubular boiler, that is to say partly as a water-tube and partly as a fire-tube
hoiler, and I so arrange that the hot gases from the furnace either pass first
through the fire-tube, portion of the boiler and then come in contact with the
water-tube portion thereof, or that the said hot gases first come in contact with the
water-tube portion of the boiler, and then pass through the fire-tube portion
thereof before going to the uptake and funnel.
'
And in order that the said invention may be fully understood I will now proceed to
describe the same. with the aid of the accompanying two sheets of drawings, in
which Figure 1 is a half front elevation, and a half transverse sectional elevation of a
boiler constructed in accordance with my invention showing the water-tube or
tubulous part of the boiler placed below the fire-tube or tubular part, and Figure 2
shows similar views of such a boiler with the fire-tube or tubular part placed below
the water-tube or tubulous part.
In both figures of the drawing A is a rectangular or other suitably shaped box
provided with two sets of tubes A A' placed at right angles to each other through
which the gases from the furnaces pass on their way to the funnel, the whole
forming a tubular boiler of ordinary construction except that the sides are flat and
the tubes run transversely across the shell instead of longitudinally therein.
B, B are water-tubes through which water circulates and round the outside of
which the gases play before passing away to the funnel. CC are the water-
pockets, D D are water-bridges which run the whole length of the boiler and
prevent the gases from the furnaces G, G' escaping to the funnel K until they
have delivered up a sufficient proportion of their heat to the tubular and tubulous
portions of the boiler. E is the steam drum, F. the down-comers, HH' the
combustion chambers, J, J' the uptakes to the funnel, L the sides of the furnaces
lined with firebricks in the usual way, and M the usual casing for the uptakes and
steam drum.
It will now be understood that in the arrangement shown in Figure 1 the hot
gases produced in the furnace G first come in contact with the water-tubes B, pass
between and around them into the combustion chamber H, then, being prevented

page_text: from passing direct to the uptake J1 by the water-bridge D, they pass through the
tubes A of the tubular boiler A and enter the uptake J, whence they pass to the
funnel K. Similarly the hot 'gases produced in the furnace G first come in
contact with the water-tubes B', pass between and around them into the combustion
chamber H', then being prevented from passing direct to the uptake J by the
water-bridge D' they pass through the tubes A of the tubular boiler A and enter
the uptake J, whence they pass to the funnel K.
It will also be understood that in the arrangement shown in Figure 2 the hot
gases produced in the furnace G being prevented from passing direct to the
water tubes B1 by the water-bridge D they pass through the tubes A of the
tubular boiler A and enter the combustion chamber H, then they pass between and
around the water-tubes B into the uptake J and thence to the funnel K. Similarly,
the hot gases produced in the furnace G' being prevented from passing direct to
the water tubes B by the water-bridge D' they pass through the tubes A' of the
tubular boiler A and enter the combustion chamber H', then they pass between
and around the water-tubes B into the uptake J and thence to the funnel K.
The arrows indicate the course of the gases in both figures.
In both the arrangements above described the circulation of the water takes
place upwards through both the tubulous and tubular parts of the boiler' in
succession and downwards through the down-comers.
In the arrangements illustrated two furnaces are employed each having a series
of water-tubes and fire-tubes for its gases to act upon; but it is obvious that if
desired a single furnace only may be employed, and a single series of water-tubes
.and fire-tubes for its gases to act upon.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is. to be performed, I declare that what I
claim is :-
First. The improved steam boiler one part of which is constructed as a tubulous
or water-tube boiler, and the other part as a tubular or fire-tube boiler, the said
parts being so combined' and arranged that the hot gases' are caused to act upon
both parts in succession before reaching the uptake or funnel, substantially as
described.
Second. In a steam boiler, the combination of one or more series of water-
tubes B B exposed to the direct action of the furnace gases, with a tubular
boiler A, subjected to the action of such gases after they leave the said
water-tubes B B', substantially as described with reference to Figure 1 of the
drawings.
Third. In a steam boiler, the combination of a tubular boiler A exposed to
the direct action of the furnace gases with one or more series of water-
tubes B B which are subjected to the action of such gases after they leave the
said tubular builer A, substantially as described with reference to Figure 2 of the
drawings..
Fourth. A steam boiler composed of a rectangular or other suitably shaped
box A provided with fire-tubes, one or more 'series of water-tubes B B', water-
pockets C, water-bridges D D¹; a steam drum E, and down-comers F, combined
and arranged substantially as described with reference to the drawings.
Fifth. A combined tubulous and tubular boiler constructed and operating
substantially as described.
Deted this 29th dox of Danamban 1908