Year: 1887

page_text: Date of Application, 29th Dec., 1887
Complete Specification Left, 28th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
I ROBERT ORB, of Cowden Hall Neilston, in the County of Renfrew, North Britain,
Manufacturer and Merchant, do hereby declare the nature of this invention to be as
follows, that is to say :-
My said Invention has for its object to increase the efficiency and durability of
steam boilers and their furnaces.
For
In carrying out my invention I substitute for the ordinary grate bars a number of
tubes of malleable iron, or steel, or copper, or other suitable metal, and I connect
these tubes at one end, preferably the inner end, with the upper part of the boiler, and
at the other end with the lower part of the boiler. I cause the air required for the
combustion of the fuel to pass down through the fuel and between the tubes.
this purpose I close, more or less completely the outer end of the ash pit or space
beneath the grate tubes, and I allow the inner end of that space to communicate with
the flue or continuation of the flue. At the same time whilst admitting air at the
outer end of the space above the grate tubes I close the inner end of that space; and
this may be conveniently done by forming a water-space pocket across the upper part
of the flue or furnace space, the inner ends of the grate tubes being connected to such
pocket. The outer ends of the grate tubes may be connected to a transverse pipe
which is connected to the lower part of the boiler at one or more parts. If found
desirable the feed water may be led into the pipes so as to pass through the grate
tubes with the view of keeping them comparatively cool.
With the improved arrangements described very complete combustion of the fuel
will be secured as the carbonaceous gases and vapors formed at the top of the fuel will
be carried down through the incandescent fuel nearer the grate tubes.
The air may be drawn in by chimney draught or it may be forced in by means of a
blower.
Dated this Twenty-eighth day of December 1887.
EDMUND HUNT,
Applicant's Agent.

page_text: Improvements in Steam Boilers and their Furnaces.
1, ROBERT ORR, of Cowden Hall, Neilston, in the County of Renfrew, North Britain,
Manufacturer and Merchant, 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 increase the efficiency and durability of
steam boilers and their furnaces.
In carrying out my Invention I substitute for the ordinary grate bars a number of
tubes of malleable iron, or steel, or copper, or other suitable metal, and I connect
these tubes at one end, preferably the inner end, with the upper part of the boiler,
and at the other end with the lower part of the boiler. I cause the air required for
the combustion of the fuel to pass down through the fuel and between the tubes. For
this purpose 1 close, more or less completely, the outer end of the ash pit or space
beneath the grate tubes, and I allow the inner end of that space to communicate with
the flue or continuation of the flue. At the same time whilst admitting the air at the
outer end of the space above the grate tubes I close the inner end of that space; and
this may be conveniently done by forming a water-space pocket across the upper part
of the flue or furnace space, the inner ends of the grate tubes being connected to such
pocket.
And in order that my said Invention and the manner of performing the same may
be properly understood I hereunto append a sheet of explanatory drawings to be
hereinafter referred to and showing the application of my improvements to a horizontal
cylindrical steam boiler of a common type with two flues.
Figure, 1, on the sheet of drawings is, one half, a transverse vertical section as
taken through the middle of one of the furnaces, the other half being an end elevation.
Figure, 2, is a longitudinal vertical section as taken along the middle of the boiler and
along the middle of one of the furnaces. In these drawings the same reference letters
are used to mark the same or like parts wherever they are repeated.
The grate of each furnace is composed of a number of tubes, A, which are made
triangular in cross section except at the ends which are round, the tubes being placed
so as to present flat upper surfaces, with the spaces between them widening downwards.
The inner ends of the grate tubes, A, are fixed in the front of a water-space pocket. B,
formed across the flue, C, at the inner end of the furnace space so as to there close the
space above the grate tubes. The front ends of the grate tubes, A, are fixed in the
inner side of a pipe, D, fixed across the front of the furnace, this pipe, D, being made
in halves with its front side bolted to the other half, and capable of removal to give
access to the front ends of the grate tubes. Each front pipe, D, is connected by a
pipe, E, with the bottom of the boiler, an arrangement with which a vigorous
circulation is produced in the boiler, the water from the bottom of the boiler passing
through the pipes, E, and D, and through the grate tubes, A, into the pocket, B, at an
upper part of the water space of the boiler.

page_text: The front end of the furnace space above the grate tubes, A, may be quite open, or
an inclined plate, F, may be arranged in front, which plate without obstructing entrance
of air may prevent outward radiation from the fire. The ashpit, G, is closed by a
door, H, at the front end of it, and the inner end of it communicates with the flue
space, C, beyond. With this arrangement the air passes down into and amongst the
fuel on the grate tubes, A, and the fire gases produced pass downwards between the
grate tubes and onwards to the flue space, C.
If found desirable the feed water may be led into the pipes, E, or D, so as to pass
through the grate tubes, A, with the view of keeping them comparatively cool. The
grate tubes, A, are supported at their middles by a transverse water tube, J.
With my improved arrangements hereinbefore described very complete combustion
of the fuel is secured, as the carbonaceous gases and vapors formed at the top of the
fuel will be carried down through the incandescent fuel nearer the great tubes.
The air for combustion may be drawn in by chimney draught or it may be forced
in by a blower.
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:-
The combination in a steam boiler and its furnace of a furnace flue with a water-
space pocket across its upper part and closing the inner end of the spaco above the
fire grate, and with an open passage into the continuation of the flue at the inner end
of the ashpit which is closed at its front end, and a fire grate consisting of tubes
having their inner ends fixed into the pocket, and their outer ends into a pipe com-
municating with the bottom of the boiler, the several parts being arranged and
operating substantially as hercin before described.
Dated this Twenty-seventh day of September 1888.
EDMUND HUNT,
Applicant's Agent.