Improvements in or connected with Steam Generators.
Year: 1895

page_text: Improvements in or connected with Steam Generators.
I, WILLIAM EAVES, of Atlas Steel and Iron Works, Sheffield, in the County
of York, Engineer, do hereby declare the nature of my invention to be as
follows:
In the Provisional Specification of the application for Letters Patent No. 14552 of
the 31st July, 1895, there is described an arrangement wherein the boiler is surrounded,
or in part surrounded, by two casings, forming two spaces wholly, or partly, around
the boiler, the outer of these spaces being provided with an air inlet, or air inlets,
open to the air for natural draught, or for induced draught, or provided with air
forcing devices for forced or induced draught, and communicating with the mouth
of the furnace by suitable valves for controlling the admission of air to the furnace.
The inner space is in communication, on the one hand, with the furnace, or the
tubes leading therefrom; and, on the other hand, with the chimney, or outlet, for
the products of the furnace, or with the fan, as the case may be. The air enters
the outer space and passes therethrough to the furnace and the products from the
furnace pass through the inner space and heat the air passing through the outer
space. The object of the present invention is to improve the heating effect, and
consists in dividing the air space, or the space for the products from the furnace,
or both of them (which in this case entirely surround the boiler body) by means of
helically arranged partitions, which form a helical, or spiral, passage in either, or
both, of the said spaces.
These partitions, as applied to the inner space, cause the hot escaping gases from
the furnace to take a belical course round the boiler body, and so distribute the
heat evenly over the boiler, maintaining an equable temperature, or practically
equable temperature, throughout, and causing a better circulation of the water in
the boiler.
The partitions, as applied to the air space outside the aforesaid space for the hot
gases, causes the air, passing to the furnace, to take a helical course round the
skin of the space enclosing the passage for the gases from the furnace, and thus a
very extended course for the said air is obtained and the air absorbs a corre-
spondingly increased amount of heat. There may be one, or more, of such
passages constituted by the helically arranged partitions.
The said partitions will also serve for connecting the skins, or casings, to; thus
considerably strengthening the structure.
Doted this 20th doxe of October 1805

page_text: Improvements in or connected with Steam Generators.
I, WILLIAM EAVES, of Atlas Steel and Iron Works, Sheffield 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 :-
In the Specification of my application for Letters Patent No. 14552 of the
31st July 1895, I describe an arrangement wherein the boiler is surrounded, or in
part surrounded, by two casings, forming two spaces wholly, or partly, around the
boiler, the outer of these spaces being provided with an air inlet, or air inlets, open
to the air for natural draught, or for induced draught, or provided with air forming
devices for forced or induced draught, and communicating (by a front space
enclosed by a casing) with the mouth of the furnace (or mouths of the furnaces) by
suitable valves for controlling the admission of air to the furnace or furnaces. The
inner space is in communication, on the one hand (by a front space enclosed by a
casing) with the furnace or furnaces or the tubes leading therefrom, and, on the
other hand, with the chimney, or outlet, for the products of the furnace or
furnaces, or with the fan, as the case may be. The air enters the outer space and
passes there through to the furnace and the products from. the furnace pass through
the inner space and heat the air passing through the outer space.
The object of my present invention is to improve the heating effect, and consists
in dividing the air space, or the space for the products from the furnace, or both
of them (which in this case entirely surround the boiler body) by means of
helically arranged partitions, which form a helical, or spiral, passage in either, or
both, of the said spaces.
These partitions, as applied to the inner space, cause the hot escaping gases from
the furnace to take a helical course round the boiler body, and so distribute the heat
evenly over the boiler, maintaining an equable temperature, or practically equable
temperature, throughout, and causing a better circulation of the water in the
boiler.
The accompanying drawing represents a boiler with the surrounding casings in
section to which an arrangement according to my present invention is applied.
A is the outer casing and A' the air space enclosed thereby. B is the inner
casing and 12 the space for hot products enclosed thereby C is a helical partition
applied to the space B2 as hereinbefore described.
If such a partition or such partitions be applied to the air space A² outside the
aforesaid space B2 for the hot gases, the air, passing to the furnace, is caused to
take a helical course round the skin of the space enclosing the passage for the
gases from the furnace, and thus a very extended course for the said air is
obtained and the air absorbs a correspondingly increased amount of heat. There
may be one, or more, of such passages constituted by the helically arranged
partitions.
The said partitions will also serve for connecting the skins, or casings, to; thus
considerably strengthening the structure.
The air may enter the space A direct as shewn or the back end of the boiler
may have a space enclosed by a casing as shewn at a² in the arrangement described
in the Specification of 145529.
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 1
claim is.
lu combination with a steam boiler two casings enclosing spaces surrounding, or
partly surrounding the body of the boiler, the one space being in communication

page_text: with the furnace or furnaces and with the chimney or outlet and the other space
being in communication with the air inlet and with the furnace or furnaces; and
either, or both, of the said spaces being provided with a helical partition or
partitions substantially as and for the purpose herein before described.
Dated this 22nd day of January 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.