Improvements in Steam Boilers.
Year: 1894

page_text: Date of Application, 19th Oct., 1894
Complete Specification Left, 17th Apr., 1895-Accepted, 24th May, 1895
I, CHARLES SCOTT GALLOWAY, of 676, Dumbarton Road, in the County of
the City of Glasgow, 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 to combine water tubes with other parts in a
manner to form improved, economical, efficient, and durable steam boilers.
In carrying out my invention according to one modification I employ three
horizontal cylindrical shells, an upper one and two lower ones. I fix in each lower°
shell au internal furnace the shell being made of a suitable size to contain the
furnace; and I connect the two lower shells with the upper one by water tubes
most of which are curved. The parts are arranged so that the fire gases after
passing from end to end of the lower shells through the furnace flues of those shells,
return between the lower shells and the upper one amongst and across the water
tubes, these tubes being by preference arranged so that the fire gases have
tortuous and not straight courses along between them. The upper shell which
comprises partly water space and partly steam space, is made of such a size
relatively to the other parts that the longest water tubes can be entered into or
withdrawn from their places from or into its interior, an arrangement facilitating
the fixing or replacing of any of the tubes.
In another modification an upper shell is combined by connecting water tubes
with a single lower shell, such lower shell being made large enough to contain two,
or preferably three internal furnaces.
Dated this Eighteenth day of October 1894.
EDMUND HUNT,
Applicant's Agent..
Improvements in Steam Boilers.
I CHARLES SCOTT GALLOWAY of 676 Dumbarton Road in the County of the
City of Glasgow 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 :-
My invention consists in an improved tubulous steam generator of the kind in
which water circulates in tubes, and which has also an internal furnace and is
constructed as arranged and illustrated in and hereafter described with reference.
to the accompanying drawings.
Figure is a sectional elevation.
Figure 2 is a longitudinal sectional elevation.
A and and B are two furnaces formed to the required shape to fit into the shells
or water-jackets C and D, the furnaces are not concentric with the shells or water-
jackets but are placed below the centre, making the space between the top of the
furnace and the shell or water-jacket the minumum required for a man to go inside
and expand the tubes. The distance between the bottom of the furnace and the
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page_text: shell or water-jacket being regulated by the space required to effect the necessary
riveting.
The combustion chamber E is formed, the sides by a continuation of the
refractory non-conducting material forming the covering of the heating tubes G,
the back by a wall of fire-brick or other suitable refractory non-conducting
material resting on or supported by a plate fixed to the ends of the shells or water-
jackets as shewn.
The plates forming the top of shells or water-jackets and the bottom plate of
the steam and water drum F into which the tubes are inserted and expanded are
of equal radius and the tubes G. J and H most of which are curved connect the
two shells or water-jackets to the steam and water drum. The tubes are arranged
so that those forming the heating tubes G are of such a length as enables them to
be drawn inside the steam and water drum. The two centre rows of tubes H are
partially protected from the heating effects of the hot gases, products of
combustion by being covered with asbestos or other refractory non-conducting
material and together with the outer rows J one on each side form down corners,
their length being continued to a point below the level of the fire bars by tubes
suitably curved fixed to the shells or water jackets.
The outer row on each side is fixed relative to the next row, so that sufficient
space is left between those two rows to retain the necessary quantity of asbestos or
other refractory non-conducting material. The flame and hot gases products of
combustion pass from end to end of the shells or water jackets through the
furnaces to the combustion chamber E and return between the shells or water
jackets and the steam and water drum F amongst and accross the heating tubes G,
which may be arranged in straight rows or zig-zaged so that the flame and hot
gases pursue a tortuous path in their passage from the combustion chamber to the
smoke box K.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that I do not
claim broadly the use of tubes to come inside the steam and water drum or of an
internal furnace arranged inside an outer shell or water jacket but what I do claim
as my said invention is
1. In a steam generator of the kind refered to, the hereinabove described
combination and arrangement of A C and B D with F.
2. A steam generator of the kind refered to in the preceeding claim wherein
the plates in which the tubes are inserted are of equal radius thus allowing the
heating tubes to be curved as shewn.
3. The down corner tubes H and J as arranged with their lengths continued in
the water space.
4. My improved steam generator substantially as described and shewn in the
accompanying drawings.
Dated this 13th day of Anril 1895
C. SCOTT GALLOWAY.