Improvements in or connected with Steam Generators.
Year: 1895

page_text: Date of Application, 18th Dec., 1895
Complete Specification Left, 19th Aug.. 1896-Accepted, 19th Sept., 1896
PROVISIONAL SPECIFICATION.
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 to be as follows:-
In the Provisional Specifications of my applications for Letters Patent No 14552
of the 31st July 1895 and 20484 of the 30th October 1895 I describe arrangements
wherein the boiler is surrounded or in part surrounded by two casings through which
the air for the furnace and the products of combustion from the furnace respectively
pass. In the one arrangement the spaces are plain and comparatively unobstructed
and in the other arrangement helical partitions are arranged which form a helical
or spiral passage in either or both of the said spaces. According to my present
invention I only employ one casing wholly or partly round the body of the boiler
forming one space around or partly around the said body the two casings at the
front of the boiler and the single casing at the back of the boiler being employed as
in the previous arrangements.
The space round the body of the boiler is made sufficiently large to accommodate a
number of tubes wholly or partially around the boiler which tubes pass longitudinally
through the said space they being connected at one end to the casing at the back
end of boiler and at the other end to the inner casing at the front end of boiler.
The air for the combustion of the fuel before entering the furnace passes through
these tubes and thus becomes heated and also lowers the temperature of the hot
escaping gases before reaching the fan (when induced draught is used) thereby not
only ensuring the proper working of the fan but being productive of great economy
in the combustion of fuel.
The cold air entering the heating tubes traverses the whole length of the tubes
and emerges into the chamber at the front of the boiler from whence it is admitted
to the furnace through regulating valves in the furnace mouth piece in such quantity
as is desirable for the proper combustion of the fuel the products from the furnace
passing into the combustion chamber and thence through the boiler tubes into the
space through which the tubes pass the said products surrounding the tubes and
imparting heat to the air passing through the said tubes to the furnace.
Dated this 18th day of December 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
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 Specifications of my Letters Patent No. 14552 of the 31st July 1895 and
No. 20484 of the 30th October 1895 I describe arrangements wherein the boiler is

page_text: surrounded or in part surrounded by two casings through which the air for the
furnace and the products of combustion from the furnace respectively pass. In the
arrangement described in the Specification of 14552% the spaces are plain and com-
paratively unobstructed and in the arrangement described in the Specification 20484º
a helical partition or helical partitions is or are arranged to form a helical or spiral
passage or passages in either or both of the said spaces. According to my present
invention which I will explain with reference to the end view (partly in section)
Figure 1 and the longitudinal section Figure 2 of the accompanying drawings,
I only employ one casing B wholly or partly round the body of the boiler forming a
space B2 around, or partly around the said body, the two casings C and D enclosing
the spaces CD at the front of the boiler and also the single casing at the back of
the boiler being employed as in the previous arrangements.
The space B round the body of the boiler is made sufficiently large to accommodate
a number of tubes A wholly or partially around the boiler which tubes pass longi.
tudinally through the said space B2 they being connected at one end to the casing at
the back end of boiler and at the other end to the inner casing D at the front end of
boiler. The air for the combustion of the fuel before entering the furnace passes
through these tubes A³ (either directly or first through a space enclosed by a back
casing as shewn at a² in the Specification 14552) and thus becomes heated and also
lowers the temperature of the hot escaping gases before they reach the fan (when
induced draught is used) thereby not only ensuring the proper working of the fan but
being productive of great economy in the combustion of fuel.
The cold air entering the heating tubes A³ traverses the whole length of the said
tubes and emerges into the chamber at the front of the boiler from whence it is
admitted to the furnace or furnaces or ash pit or pits or both through regulating
valves in the furnaco mouth and ash pit piece in such quantity as is desirable
for the proper combustion of the fuel the products from the furnace passing into the
combustion chamber and thence through the boiler tubes (if the invention be applied
to a tubular boiler) into the space B2 through which the tubes A³ pass, the said
products surrounding the said tubes A³ and imparting heat to the air passing through
the said tubes A³ to the furnace.
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:-
In combination with a steam boiler a casing surrounding, or partly surrounding,
the body of the boiler, and in communication with the furnace, or furnaces, and with
the chimney, or outlet, and having tubes, or passages, passing through the said space,
and in communication with the air inlet and with the furnace or furnaces, substantially
as herein before described and illustrated in the accompanying drawings.
Dated this 19th day of August 1896
JOHNSONS & WILLCOX.
47 Lincoln's Inn Fields, London, W.C., Agents.