Improvements in Steam Generators.
Year: 1892

page_text: Date of Application, 8th July, 1892
Complete Specification Left, 27th Mar., 1893-Accepted, 8th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Steam Generators.
I, JOHN LYALL of the firm of Anderson & Lyall, 57 Copeland Road, Govan,
in the County of Renfrew, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in steam generators and it has for its
object to provide a combined water tube and fire tube generator. With that object
the generator is composed of a double shell the interior one of which constitutes
the furnace or fire box and has within it a series of tubes, extending from front to
back and communicating at both ends with the water space of the generator. The
interior shell may be lined with fire brick or other refractory material or it may be
composed of a double casing into which the feed water is conducted to be heated
and purified previously to being discharged into the steam generating space of the
boiler and at its rearward end the interior shell or fire box is extended upwards to
constitute a chamber after the manner of the fire box of a locomotive boiler. At
the base of this upward extension a pocket or well is made in the water space of
the generator the said pocket extending downwards into the fire box and serving
to deflect the flame and gaseous products of combustion downwards at that point
from whence they pass into the upper extension aforesaid and thence through a
series of tubes to the smoke box of the generator. Within the pocket a pipe is
arranged one end of which is carried through the water space and connected with
the bottom of the boiler and the other end is carried through the outer shell where
it is furnished with a valve or cock the said pipe being provided for the purpose of
blowing off scale or sludge from the bottom of the boiler and to prevent it falling
into the water space.
Instead of a water space to deflect the flame a fire brick deflector may be built
and the blow off pipe built into it.
The upper chamber of the interior shell has a man hole extending through the
exterior shell to afford access to the furnace or fire box the said man hole being
closed by a door in the usual manner and to afford facility for repairing, cleaning,
withdrawing or renewing the water tubes extending through the interior shell or
furnace the front and back ends of the exterior shell have a door or doors opposite
the ends of the tubes or hand holes opposite the ends of each tube for fitting,
unfitting or cleaning the tubes the said holes being closed with plugs, caps or plates
of any suitable construction screwed in or held in position by bridges and screws
and rendered steam and water tight coming metal to metal or by india rubber,
asbestos or other packing.
Dated this Seventh day of July 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Steam Generators.
I, JOHN LYALL of the firm of Anderson & Lyall 57 Copeland Road, Govan in
the County of Renfrew, 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 :-
This invention. relates to improvements in steam generators and it has for its
object to provide a combined water tube and fire tube generator.

page_text: In the accompanying drawings which illustrate the invention
Figure 1 is a longitudinal vertical section, Figure 2 a cross section and Figure 3
a horizontal section of a modification of the improved steam generator adapted for
marine purposes.
Figure 4 is a longitudinal vertical section, Figure 5 a horizontal section and
Figures 6 and 7 cross sections at different points of a further modification of the
improved marine boiler.
Figure 8 is a longitudinal vertical section of a double ended form of the
improved boiler of marine type.
Figure 9 is a similar view of a modification of the improved boiler as adapted
for use on land, and
Figure 10 is a similar view of a modification adapted for locomotive purposes.
The improved steam generator in its various modifications is composed of a
double shell A. A' the interior one A of which constitutes the furnace or fire box
and has within it a series of tubes B extending from front to back and com-
municating at both ends with the water space of the generator. The interior
shell A may be lined with fire brick or other refractory material or as indicated
at A² it may be composed in part of a double casing into which the feed water is
conducted to be heated and purified previously to being discharged into the steam
generating space of the boiler and at the rearward end the interior shell or fire
box A is extended upwards to constitute a combustion chamber C like the fire box
of a locomotive boiler. At the base of this upward extension Figure 4 a pocket
or well D is made in the water space of the generator the said pocket extending
downwards into the fire box and serving to deflect the flame and gaseous products
of combustion downwards at that point from whence they pass between the tubes
into the upper extension C aforesaid or as shewn in Figures 1, 2, 8 and 9 the flame
passes upwards between the tubes through openings E into the upper chamber C
and thence through a series of fire tubes F to the smoke box or uptake G of the
generator.
The upper chamber of the interior shell may have a man hole extending
through the exterior shell to afford access to the furnace or fire box the said
manhole being closed by a door in the usual manner and to afford facility for
repairing, cleaning, withdrawing or renewing the water and fire tubes extending
through the interior shell or furnace the front and back ends of the exterior shell
have a door or doors opposite the ends of the tubes or hand holes H opposite the
ends of each tube for fitting, unfitting or cleaning the tubes the said holes being
closed with plugs caps or plates of any suitable construction screwed in or held in
position by bridges and screws and rendered steam and water tight coming metal
to metal or by india-rubber, asbestos or other packing.
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 arrangement and combination of parts constituting the combined fire
tube and water tube steam generator herein before described under several
modifications with reference to the accompanying drawings.
2. A steam generator composed of a fire tube section formed over or around
the combustion chamber and a water tube section situated directly over the fire
grate or furnace substantially as described with reference to the accompanying
drawings.
Dated this 24th day of March 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.