Improvements in Apparatus for Superheating Steam or for Heating Boiler Feed Water.
Year: 1894

page_text: Date of Application, 3rd Aug., 1894
Complete Specification Left, 2nd May, 1895-Accepted, 8th June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Superheating Steam or for Heating
Boiler Feed Water.
I, GEORGE SINCLAIR, of Albion Boiler Works, Leith, in the County of
Mid Lothian, North Britain, Boiler Maker, do hereby declare the nature of this
invention to be as follows, that is to say :-
My said invention has for its object to improve the construction and arrangement
of apparatus for superheating steam or for heating boiler feed water, and to apply
for such purposes in a better manner than heretofore some of the heat remaining in
the fire gases of a steam boiler after they have acted on the main parts of the
boiler itself.
In carrying out my invention I employ long leugths of comparatively small
tubing, say of from one to two inches in diameter; and I have each length bended
into zig-zag loops to form a sheet-like section such as will lie upon or against a flat
surface, but with openings through the loops. The tube of each section or sheet
has flanges at its ends for bolting to flanges on a main inlet pipe and a main outlet
pipe; and a number of the tubular sections or sheets are grouped together and are
placed horizontally or vertically in one or more flues or spaces through which the
fire gases pass..
In one modification which is convenient for a horizontal cylindrical boiler with
return fire-gas tubes there are, for superheating the steam, two groups of the
tubular sectious or sheets placed one on each side of the middle immediately above
the curved top of the boiler. Pipe connections with stop valves are provided, by
the adjustment of which valves the steam from the boiler may be made to pass
through the superheating tubes; or when the tubes require examination or repair,
the steam may be shut off from them, and then any tubular section or sheet can be
disconnected and withdrawn without interfering with any other section.
If the tubular sections or sheets are vertical they may be suspended on horizontal
bars extending through some of the upper loops; and if they are horizontal they
may be supported on struts or small pillars made with concave bottoms and tops
so that each set may rest on tubes of a lower sheet and support tubes of an
upper sheet.
For feed-heating purposes the same arrangement of grouped tubular sections or
sheets may be used, connections being made with the feed-water supply pipe on one
side and with the boiler on the other. The same boiler may have in connection
with it both superheating and feed-heating apparatus the fire gases being made to
act on the latter after acting on the former.
Dated this Second day of August 1894.
EDMUND HUNT,
Applicant's Agent

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Superheating Steam or for Heating
Boiler Feed Water.
I. GEORGE SINCLAIR, of Albion Boiler Works, Leith, in the County of
Mid Lothian, North Britain, 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, that is to say:-
My said invention has for its object to improve the construction and arrangement
of apparatus for superheating steam or for heating boiler feed water, and to apply
for such purposes in a better manner than heretofore some of the heat remaining
in the fire gases of a steam boiler after they have acted on the main parts of the
boiler itself.
In carrying out my invention I employ long lengths of comparatively small
tubing, say of from one to two inches in diameter; and I have each length bended
into zig-zag loops to form a sheet-like section such as will lie upon or against a flat
surface, but with openings through the loops. The tube of each section or sheet
has flanges at its ends for bolting to flanges on a main inlet pipe and a main outlet
pipe; and a number of the tubular sections or sheets are grouped together, and are
placed horizontally or vertically in one or more flues or spaces through which the
fire gases pass.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append three sheets of explanatory drawings,
to be hereinafter referred to, and showing examples of my improved apparatus.
Figures, 1, and 2, on Sheet, 1, of the drawings are vertical sections, as at right
angles to each other, of one modification of my improved apparatus as applied to a
horizontal cylindrical land boiler.
Figure, 3, on Sheet, 2, is a longitudinal vertical section of the same as applied to
a Lancashire boiler.
Figures, 4, and 5, are vertical sections, as at right angles to each other, of the
apparatus, as applied in the main flue from a series of boilers.
Figures, 6, and 7, on Sheet, 3, are an elevation and a vertical section, as at right
angles to each other, of a modification of the apparatus as applied to a marine
boiler.
Figure, 8, is a plan of one tubular section and the main inlet and outlet pipes.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the modification, shown in Figures, 1, and 2, as applied to a horizontal
cylindrical boiler with return fire-gas tubes, there are, for superbeating the steam,
two groups of the tubular sections or sheets placed one on each side of the middle
immediately above the curved top of the boiler, and each section consists of a
length of small tubing, A, bended into zig-zag loops with openings through them.
Each tube, A, has flanges, B, and C, at its ends for bolting to flanges on the main
inlet pipe, D, and a main outlet pipe, F. Steam is admitted from the boiler into
the main inlet pipe, D, by means of a pipe, G, provided with a stop valve, H, and
passing through the tubes, A, to the main outlet pipe, F, goes by a pipe, J,
provided with a stop valve, K, to a main steam pipe, L. When the tubes, A,
require examination or repair, the steam may be shut off from them by means of
the stop valve, and made to pass directly through a stop valve, M, to the main
steam pipe, L, and then any tubular section or sheet can be disconnected and with-
drawn upwards without interfering with any other section. The movable covers, Y,
resting on the brick casing and on transverse 1-bearers, Z, are provided to allow
of the tubular sections, A, being easily withdrawn.

page_text: The tubular sections or sheets being vertical are supported at intermediate points
on horizontal bars, N, extending through some of the upper loops and being fixed
into the brick or equivalent casing.
The fire gases pass from the fire-gas tubes, P, into the smokebox, Q, and (the
damper, R, on each side of the boiler having been previously closed) proceed by
the opening, S, into the space enclosing the tubular sections and finally escape by
the opening, T, to the flue, V. When it is not wished to use the superheating
apparatus the bye-pass dampers, R, are opened and the fire gases escape directly to
the flue, V. Two doors, W, are provided at the front of the boiler for cleaning
purposes.
The groups of tubular sections, A, are similarly arranged in connection with the
Lancashire boiler shown in Figure, 3. The fire gases passing in the direction of
the arrow enter the opening, S, (the dampers, R, being open and the butterfly
dampers, X, closed) and pass into the space enclosing the tubular sections, A,
finally escaping to the flue, V. When it is not wished to use the superheating
apparatus the dampers, R, are closed and the dampers, X, are opened, and the fire
gases escape directly to the flue, V. Pipe connections, similar to those herein-
before described, with reference to Figures, 1, and 2, are provided in connection
with the main outlet and inlet pipes, D, and F. The movable covers, Y, resting on
the brick casing and on transverse 1-bearers, Z, are provided to enable the tubular
sections to be easily withdrawn.
Figures, 4, and 5, show the apparatus applied in the main flue, V, from a series
of boilers, the tubular sections, A, being like those herein before described, and
being arranged and supported in a similar manner.
Figures 6, and, 7, show a modification of the apparatus as applied to a marine
boiler. In this case, the tubular sections are horizontal and are fixed to vertical
main inlet and outlet pipes, D, and, F. There is one group of tubular sections, A,
and it is arranged in the uptake, V, each tube being carried at the inner ends of
the loops on angle irons, U, and at the outer ends on channel irons, E, fixed to the
uptake casing. The tubes, A, are entered in between the channel irons, E, and
each opening is closed by a plate (not shown) fixed by screws.
In other cases where the tubes, A, are horizontal they may be supported on
struts or small pillars made with concave bottoms and tops so that each section may
rest on tubes of a lower section or sheet and support tubes of an upper sheet.
An important feature of my apparatus is that none of the tube joints is exposed
to the action of the fire gases.
For feed-heating purposes the same arrangement of grouped tubular sections or
sheets may be used, connections being made with the feed-water supply pipe on one
side and with the boiler on the other. The same boiler may have in connection
with it both superheating and feed-heating apparatus the fire gases being made to
act on the latter after acting on the former.
Having now particularly described and ascertained the nature of iny said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Apparatus for superheating steam or for heating boiler feed water, comprising
groups of tubes, each of which tubes is bended into zig-zag loops to form a sheet-
like section, and is bolted to a main inlet and a main outlet pipe, the groups of
tubes being placed vertically or horizontally in one or more flues or spaces through
which the fire gases pass, but without exposure of the joints to great heat
substantially as hereinbefore described.
D
1005
EDMUND HUNT,
Applicant's Agent.