Improvements in or connected with Marine and other Steam Boilers.
Year: 1895

page_text: Date of Application, 18th July, 1895-Accepted, 24th Aug., 1895.
COMPLETE SPECIFICATION..
Improvements in or connected with Marine and other Steam
Boilers.
I, JAMES OLIVER GILBERT of 81 Porthkerry Road, Barry, in the County of
Glamorgan, South Wales, Foreman Boiler Maker, 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:
My invention refers to improved construction and arrangement of parts of steam
boilers whereby an unequal expansion of parts of same is practically prevented,
while the consumption of fuel is reduced.
In steam boilers as at present usually constructed there is often an unequal
expansion of parts of same which is the cause of a good deal of repairs being
necessitated to the bottom of the boiler. This to a great extent is occasioned
because, from the centre of the furnace to the top are the effective heating surfaces
while from the centre of the furnace to the bottom of the boiler there is practically
no effective heating surface, and so that when the boiler is fired it is commonly
three or four days with a heavy pressure of steam at the top, while the bottom is
comparatively cold.
My invention relates to improved means whereby I equalize the effective heating
surface above and below the furnaces and I also economize the consumption of fuel,
in marine and other steam boilers, by producing a more perfect combustion and
providing for an improved circulation of the heated products both above and
below the furnaces. In marine and other boilers constructed according to my
invention and as hereafter described I cause the heated products to pass from
the furnace into a lower combustion chamber from which they pass below the
furnace, to a return chamber from whence the products are conducted by tubes
above the furnace, to the upper combustion chamber and to the funnel; the
heated products are thus conducted four times through the boiler, instead of
twice as is now usually the case.
In order that my invention may be readily understood I will describe same with
reference to the accompanying drawings, on which similar letters of reference
indicate like parts in all the figures.
Figure 1 is a longitudinal section of so much of a double-ended marine steam
boiler constructed or arranged according to my said invention; as will be necessary
to explain same; Figure 2 is a vertical cross-section taken about the line
of Figure 1, and Figure 3 is an end elevation of same.
y
A is the shell of the boiler, B B are the furnaces, arranged back to back as
shewn, and extending at both ends somewhat beyond the ends of the boiler proper.
At their inner ends, the furnaces B B communicate with a central internal com-
bustion chamber, the latter being divided, as shewn at Figure 1, into an upper
part C, and lower parts D D, there being one such chamber or flue D for each
furnace the latter (each furnace) opening into the said lower chambers D. By
reference to Figure 2 it will be observed that the internally divided combustion
chamber is formed "saddle shaped" providing for circulation of the water at the
sides E, and by the central space F, which latter extends entirely through the
combustion chamber, these parts being suitably and properly stayed, the formation
of the central space F serving also to divide longitudinally, the lower flues D D.
Upon the ends of the boiler and around the projecting furnaces B B, I fit smoke

page_text: :
boxes G, and tubes H extend from the flues D below the furnaces, to the said
smoke boxes G, while tubes J extend from the smoke boxes G to the combustion
chamber C, passing above the furnaces. K is the funnel.
By this construction the products of combustion pass from the furnace B in the
direction shewn by the arrows in Figure 1, through the flues D, the tubes H below
the furnaces entering the smoke boxes G, and passing around the exterior of the
furnace B, enter the tubes J, above the furnaces and deliver the products of
combustion into the combustion chamber C and from thence to the funuel K.
The plates D'D' forming the dividing plates of the flues D, are preferably bolted
in position so as to be easily removed if required.
The smoke boxes G are provided with suitable doors G', the left hand
half at Figure 3 being shewn with the doors in position, while at the right hand
half the doors G' have been removed. I do not generally fit any divisions in
the smoke boxes G although such may be provided if found desirable. The
doors Gare shewn as fitting under. an external top flange G2 and against an
internal ring G³ Fig. 1, the handles G having tongues taking behind plates G³,
but such fittings may be modified according to circumstances without in any way
departing from my invention. L Fig. 3 is a manhole. Although I.have shewn
my improvements as applied to a double-ended boiler of marine type, single-ended
-boilers may readily be constructed or modified in accordance with my invention as
will be well understood.
Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed I declare that what I claim as
my improvements in or connected with marine and other steam boilers, is as
follows-
1. The combination with the furnaces B B, of a combustion chamber, flues D in
the combustion chamber, tubes H extending from the flues D below the furnaces,
smoke boxes G into which the tubes H enter, tubes J from smoke boxes G passing
above the furnaces B to the combustion chamber C and funnel K, and whereby the
effective heating surfaces are practically equalized above and below the furnaces
constructed and acting substantially as and for the purposes set forth.
2. The general arrangement and combination of parts. composing: my improve-
ments in and connected with marine and other steam boilers all constructed and
acting substantially as described and illustrated with reference to the accom-
panying drawings, together with any mere modification or modifications thereof. :
Dated this 18th day of July 1905.
BREWER & SON,
London and Leeds, Agents for Applicant.