Improvements in Firegrates and Smoke-consuming Apparatus for Steam Boiler and other Furnaces.
Year: 1894

page_text: Date of Application, 11th July, 1894
Complete Specification Left, 10th Apr., 1895-Accepted, 11th May, 1895
Improvements in Firegrates and Smoke-consuming Apparatus for
Steam Boiler and other Furnaces.
I JOHN HUTTON Senr. of 13 Court 6 House Sorby Street Sheffield in the
County of York, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in firegrates and smoke consuming
apparatus for steam boiler and other furnaces, and has for its object the more
perfect combustion and economy of the fuel.
In carrying out my invention as applied to the furnaces of internally fired
steam boilers, I construct the grate bars in nests of either five or seven longitudinal
bars, which are cast together and made of lengths to suit the grate. The middle
bar of each nest being made about double the depth of the bars on each side of it.
The bars in each nest are tied together by narrow ribs in the air spaces and at
each end, in such a manner that the ribs in the air space of any two bars fall
midway between the air spaces of the adjacent bars, thus enabling each uest of
bars to expand and contract in the transverse direction of the nest of bars.
1.
One end of each nest of bars, where it rests on the end-bearer, is inclind to the
borizon at an angle of about 30°, so that it is free to expand or contract in a longi-
tudinal direction on the end bearer.
At the front end of the ashpit I fix a portable plate in such a manner as to
regulate the inlet of air underneath the grate, and to cause the air to enter the
ashpit and furnace in an inclined and upward direction, which also causes the air to
enter the front part of the grate at an increased velocity.
Immediately behind the ordinary back bridge I construct a hot-air chamber of
firebricks, on which I mount a covering of firebricks or other material.
In this
covering are a number of openings for the outlet of the hot air.
I also construct a simicircular and hollow arch of firebricks or other material on
the covering of the aforesaid hot air chamber in such a manner that the air in this
chamber has free circulation around this arch, the bricks of which are perforated
with a number of holes to allow the hot air to pass through them.
I connect the aforesaid hot air chamber to the back end of the air space of the
ashpit by means of an opening in the front wall of the aforesaid hot-air chamber.
This opening will also enable the said hot-air chamber to be kept clean.
It will thus be seen that as the products of combustion leave the grate they pass
through a simicircular opening which is completely surrounded by hot air jets, thus
causing the hot air to mix freely with the gases and consume the smoke.
Dated this 10th day of July 1894.

page_text: Improvements in Firegrates and Smoke-consuming Apparatus for
Steam Boiler and other Furnaces.
I JOHN HUTTON of 13 Court 6 House, Sorby Street, Sheffield in the County
of York 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 relates to improvements in firegrates and smoke consuming
apparatus for steam boiler and other furnaces, and has for its object the more
perfect combustion and ecconomy of the fuel.
In carrying out my invention as applied to the furnaces of internally fired steam
boilers, I construct the grate-bars in nests of either five or seven longitudinal bars,
which are cast together, and made of lengths to suit the grate, the middle bar of
each nest being made about double the depth of the bars on each side of it.
The bars in each nest are tied together by narrow ribs in the air spaces, and at
each end, in such a manner that the said ribs in the space between any two bars
fall midway between those in the spaces adjoining, thus enabling each nest of bars
to expand or contract in the transverse direction of the nest of bars.
One end of each nest of bars where it rests on the end bearer is inclined to the
horizon at an angle of about 30°, so that it is free to expand or contract in the
longitudinal direction, on the end bearers.
Immediately behind the firegrate I construct a hot-air chamber of firebricks on
the walls of which I mount an inclined and perforated bridge of firebricks, in such
a manner, that hot-air may pass through the said perforations and meet the gases
from the firegrate.
Directly over the aforesaid hot-air chamber and inclined bridge, and supported
on the said air-chamber walls, 1 construct a simicircular perfored, and recessed
⚫arch of firebricks, in such a manner that the hot-air in the aforesaid chamber has
free access to and around the said recess, and perforations in the aforesaid arch,
and also meets the gasses from the firegrate.
I connect the aforesaid hot-air chamber with the back end of the ashpit, by
means of an opening in the front wall of the aforesaid hot-air chamber. This
opening also enables the hot-air chamber to be cleaned out..
It will thus be seen, that immediately the products of combustion leave the fire-
grate, they pass through the opening, between the inclined bridge and semicircular
arch, and are met by a number of hot air jets, thus causing the hot air to mix with
the products of combustion, and consume the smoke or carbon.
In order that my said invention may be fully understood and carried into effect,
I will proceed to describe the drawings hereunto annexed.
Figs. 1. 2. and 3 represent the application of my invention to ordinary land
boilers,
Fig. 1 representing a longitudinal section through the hot-air chamber C,
inclined and perforated bridge B, and the recessed and perforated arch A, S being
the recess, and opening D.
Fig. 2 represents a front view of same and Fig. 3. represents a transverse section
of same.
Figs. 4. and 5. represent the application of my invention to marine boilers
Fig. representing a longitudinal section corresponding to Fig. 1.
Fig. 5. represents a sectional plan of same. The same letters of reference in
each figure representing corresponding parts.
Figs. 6. 7 and 8 represent a side view, plan, and transverse section of the aforesaid
grate bar, as herein before specified.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is, or may be carried into effect, I declare
that what I claim is :-
1st. In smoke consuming apparatus for internally fired steam boilers, as herein-
referred to, the construction, combination and arrangement of a firebrick hot-air
chamber and front opening, having an inclined and perforated covering or bridge
of firebricks, substantially as herein before described, and as illustrated by the
drawings hereunto annexed.
2nd. In smoke consuming apparatus for internally fired steam boilers as herein
referred to, the construction, combination, and arrangement of a firebrick hot-air
chamber with an opening in front, and having an inclined and perforated covering
or bridge of firebricks on same, and a simicircular, perforated and recessed arch of
firebricks supported on said hot-air chamber walls, substantially as hereinbefore
described, and as illustrated by the drawings hereunto annexed, Figs. 1, 2, 3, 4,
and 5.
Dated this 10th day of & nail 1905
JOHN HUTTON,
Applicant.