Improvements in Furnaces for Burning Sludge, Slurry, and like Materials.
Year: 1894

page_text: Date of Application, 5th July, 1894
Complete Specification Left, 25th Apr., 1895-Accepted, 24th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Furnaces for Burning Sludge, Slurry, and like
Materials.
We, SAMUEL JOHNSON BEAMAN of 96 Bewsey Road, Contractor, and JAMES
DEAS of 35 Folly Lane, Engineer, both of Warrington in the County of Lancaster,
do hereby declare the nature of this invention to be as follows:-
This invention relates to furnaces which may be employed for the purpose of
burning the sludge from sewage works, from manufacturers' settling tanks and
similar sources, the slurry or slip in the manufacture of Portland cement, and
other like materials.
In a furnace constructed according to these improvements the grate and an
inclined feeding hearth are arranged below a reverberatory arch. At the back of
the grate there may be a hollow bridge and beyond this, a perforated screen.
There is thus formed between the bridge and screen a secondary combustion
chamber to which air may be supplied by and through the hollow bridge.
It is preferred to use a closed ash-pit and forced draught.
The products of combustion from the furnace, after passing the screen, are
caused to return through suitable flues, to below the inclined feeding hearth which
becomes highly heated thereby.
We may arrange to take off some of the hot gases from the furnace from near
the upper end of the inclined feeding hearth, in which case these gases may be led
through suitable passages into the hollow fire-bridge, where they mingle with the
incoming air and become burnt in the secondary combustion chamber.
If there be no carbonaceous or other combustible matter in the sludge slurry or
like material to be burnt, a sufficient quantity is mixed therewith.
The material to be burnt is fed upon the upper part of the inclined feeding
hearth where it becomes dry and down which it moves on to the grate where the
combustion is completed.
Side doors in the furnace and ash-pit may be provided for the removal of the
clinkers and dust.
The inclined feeding hearth may be constructed of cast iron with a corrugated
or deeply grooved upper surface, so as to provide a large area of contact, and it
may be made in separate bars or sections for convenience.
Dated this 4th day of July A.D. 1894.
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Furnaces for Burning Sludge, Slurry, and like..
Materials.
We, SAMUEL JOHNSON BEAMAN, of 96 Bewsey Road, Contractor, and JAMES
DEAS of 35 Folly Lane, Engineer, both of Warrington in the County of Lancaster,,
do hereby declare the nature of this invention, and in what mauner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
.}
This invention relates to furnaces which may be employed for the purpose of
burning the sludge from sewage works, from manufacturers' settling tanks, and

page_text: other sources, the slurry or slip produced in the manufacture of Portland cement,
and other like materials.
In a furnace constructed according to these improvements, the grate and an
inclined feeding hearth are arranged below a reverberatory arch. At the back of
the grate there may be a hollow bridge, and beyond this, a perforated screen.
There is thus formed, between the bridge and the screen, a secondary combustion
chamber, to which air may be supplied by and through the hollow bridge.
It is preferred to use a closed ash-pit and forced draught.
The products of combustion from the furnace, after passing the screen, are
caused to return through suitable flues, to below the inclined feeding hearth, which
becomes highly heated thereby.
We may arrange to take off some of the hot gases from the furnace from near
the upper end of the inclined feeding hearth, in which case these gases may be
led through suitable passages into the hollow fire-bridge, where they mingle with
the incoming air, and are afterwards burnt in the secondary combustion chamber.
If there be no combustible matter in the sludge, slurry, or like material to be
burnt, a sufficient quantity of breeze or other suitable combustible matter is mixe l
with it.
· The material to be burnt is fed upon the upper part of the inclined feeding
hearth, where it becomes dry, and down which it moves on to the grate, where the
⚫ combustion takes place or is completed.
Side doors in the furnace and ash-pit may be provided for the removal of the
clinkers and dust.
The inclined feeding hearth may be constructed of cast iron with a corrugated
or deeply grooved upper surface, so as to provide a large drying surface, and it
may be made in separate bars, or in sections, as is more convenient.
We will more particularly describe our said invention with reference to the
accompanying drawings in which :-
Figure 1 represents a vertical longitudinal section,
Figure 2 a horizontal section taken along the line - Figure 1, and
Figure 3 a vertical transverse section taken along the line y-y Figure 1.
In each of the figures, A is the reverberatory arch, B the grate, C the inclined
feeding hearth, D the hollow fire-bridge, E the perforated screen, F the secondary
combustion chamber between the bridge and the screen, and G the ash-pit which
may be closed and provided with a forced draught through the conduit H. All
these parts, as represented, are, except the inclined hearth, of known construction
and it will be understood therefore that we do not in this Specification claim them
separately as our invention.
At the back of the secondary combustion chamber we erect an auxiliary chamber
or an equivalent flue or passage I, which communicates through the flue J with
the space K, beneath the inclined feeding hearth. It is advantageous to erect a
bridge L in this space, for the purpose of deflecting the hot gases upon the under
side of the feeding hearth. After passing the bridge L and the under side of the
hearth, the gases make their exit to the chimney through a flue such as M.
We prefer to employ the special construction of inclined feeding hearth
illustrated by the drawings. This hearth consists of flanged angle bars arranged
closely together, and preferably connected by bolts or rivets passing through the
flanges as indicated by Figure 2.
Instead of allowing all the gases from the furnace to pass directly over the
bridge D, we may, as already described, lead some of the gases from a point over
the inclined feeding hearth, into the secondary combustion chamber, through the
hollow bridge, but we may also, and as an alternative in general cases, lead the
gases from the upper part of the inclined feeding hearth direct to the secondary
combustion chamber, through the passages N, of which there may be one on each
side of the furnace, constructed in the furnace wall.
i.
These furnaces may be constructed singly or in groups, as in the case of ordinary
destructors.
.

page_text: The material to be burnt is supplied to the feeding hearth through the opening O,
in such a quantity that this opening is kept closed by the material whilst the
furnace is in operation.
P is a door through which the grate may be cleaned and the clinkers removed.
Dust may be removed from the ash-pit through the door R, and from the flues and
chambers below the furnace and hearth, through the doors S T. The fresh air
may be supplied to the hollow bridge, through the passages U.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a furnace for burning sludge, slurry and like materials, a chamber or
space below an inclined feeding hearth, into which chamber the hot gases from the
furnace are led in such a manner as to impart their heat to the hearth, substantially
as and for the purpose hereinbefore described and as illustrated by the accom-
panying drawings.
2. In a furnace for burning sludge, slurry, and like materials, an inclined feeding
hearth having preferably a sinuous or zig-zag cross section, and having also a
space below it into which the products of combustion are led, substantially as and
for the purpose hereinbefore described and as illustrated by the accompanying
drawings.
3. In a furnace for burning sludge, slurry and like materials, a passage or
passages connecting the interior of the furnace near the upper part of the hearth,
with a hollow fire-bridge or a secondary combustion chamber, substantially as
hereinbefore described and as illustrated by the accompanying drawings.
Dated this 24th day of April A.D. 1895.
WILLIAM E. HEYS.