Improvements in Steam Boilers.
Year: 1891

page_text: Date of Application, 12th June, 1891
Complete Specification Left, 11th Mar., 1892-Accepted, 16th Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
I, MATTHEW PAUL, Junior, of Levenford Works, Dumbarton, in the County
of Dumbarton, North Britain, Engineer, do hereby declare the nature of this
invention to be as follows, that is to say
My said invention has for its object improvements in the construction of steam
boilers of a kind made with vertical water tubes and sometimes called haystack
boilers.
In carrying out my invention I make the body of the boiler of a vertical
cylindrical form with a hemispherical or dome-shaped top. The furnace grates
occupy an internal annular space at the lower part of the boiler and two or more
fire doors are provided at equidistant parts round the boiler. The furnace space is
covered by a horizontal water space extending inwards from a circumferential
vertical water space extending completely round the cylindrical part of the boiler
shell. There is a central opening up through the lower horizontal water space,
and the fire gases converging from the furnace space pass up through the central
opening into a cylindrical chamber enclosed by the circumferential water space and
covered by an upper horizontal plate, which is a tube plate having fixed in it the
upper ends of vertical water tubes having their lower ends fixed in the top plate of
the lower horizontal water space. The fire gases passing up into a central space
surrounded by the vertical water tubes pass amongst these tubes in radial
directions, and then find egress through tubular stays or flues crossing the
circumferential vertical water space into an outer annular smoke box extending
round the boiler, or into detached smoke boxes, proceeding thence upwards through
two or more uptake flues to the funnel. Within the annular furnace space a fire-
brick bridge piece or abutment is preferably constructed upon a hollow iron casing,
and a regulated supply of air can be admitted through openings in the top of this
bridge piece, the space over which forms an efficient combustion chamber, so that
smoke is prevented and fuel economised. The water level is a little above the
top tube plate, and the dome-shaped space above forms an ample steam chamber.
Dated this Eleventh day of June 1891.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
I, MATTHEW PAUL, Junior, of Levenford Works, Dumbarton, in the County
of Dumbarton, North Britain, 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, that is to say :-
:-
My said invention has for its object improvements in the construction of steam
boilers of a kind made with vertical water tubes and sometimes called haystack
boilers.
In a boiler made according to my invention the vertical water tubes extend from
the upper side of an annular water space to a flat upper plate; and the fire gases
pass from furnaces below the annular water space up through the central opening
within that space, then radially across the annular series of water tubes, and next
through short tubes or tubular stays across the circumferential water space to one
or more external smoke boxes communicating with the funnel.

page_text: An example of my improved steam boilers is delineated on an accompanying
shect of explanatory drawings,
Figure, 1, being a vertical section, whilst
Figure, 2, is a horizontal section one half as above the top tube plate of the
vertical water tubes, and the other half as across the annular water space.
The outer shell, A, of the body of the boiler is of a vertical cylindrical form
surmounted by a hemispherical or dome-shaped top, B. The furnace grates, C,
occupy an internal annular space, D, at the lower part of the boiler, and two or
more fire doors, E, are provided at equidistant parts iound the boiler. The furnace
space, D, is covered by a horizontal annular water space, F, extending inwards
from a circumferential water space, G extending completely round the cylindrical
part of the boiler shell, A. There is a central opening, H, up through or within
the annular horizontal water space, F, and the fire gases converging from the
annular furnace space, D, pass up through the central opening, H, into a cylindrical
chamber, J, enclosed by the circumferential water space, G, and covered by an
upper horizontal plate, K, which is a tube plate, having fixed in it the upper ends
of vertical water tubes, L, the lower ends of which are fixed in the top plate of
the lower horizontal water space, F. The fire gases passing up through the
opening, H, into the central part of the chamber, J, proceed amongst the vertical
water tubes, L, in radial directions, and then find egress through tubular stays, M,
or it might be through a small number of flue openings, across the circumferential
water space, G, into an outer annular smoke box extending round the boiler, or
into two or more detached smoke boxes, N, proceeding thence upwards through two
or more uptake flues, P', to the funnel, Q.
Within the annular furnace space, D, a firebrick bridge piece or abutment, R, is
placed being, preferably constructed upon a hollow iron casing, S, and a regulated
supply of air can be admitted through openings in the top of this casing, S, the
space over which and between it and the top tube plate, K, forms an efficient
combustion chamber. The water level is a little above the top tube plate, K, and
the space within the dome, B, above, forms an ample steam chamber.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. The improved construction of steam boiler substantially as hereinbefore
described and shown in the accompanying drawings.
2. In a domed vertical-cylindrical steam boiler having an internal chamber
crossed by an annular series of vertical water tubes, a central bottom entrance for
the fire gases into such chamber and as outlets therefrom tubular stays or short
flues crossing the circumferential water space substantially as hereinbefore
described.
Dated this Tenth day of March 1892.
EDMUND HUNT,
Applicant's Agent.