IMPROVEMENTS IN FURNACES FOR GENERATING STEAMERA
Year: 1878

page_text: LETTERS PATENT to Charles James Stewart, of No. 4, Sugar Loaf Court
Leadenhall Street, in the City of London, Wine Merchant, for the Invention
of "IMPROVEMENTS IN FURNACES FOR GENERATING STEAM." A communica-
tion from abroad by Seymour Alfred Mower, of Dhalla, in the Town of
Rangoon, in British Burmah, and John Pitt, of Kemendine, in Rangoon
aforesaid.
Scaled the 13th December 1878, and dated the 23rd October 1878.
COMPLETE SPECIFICATION filed by the said Charles James Stewart at the
Office of the Commissioners of Patents on the 23rd October 1878.
CHARLES JAMES STEWART, of No. 4, Sugar Loaf Court, Leadenhall Street, in the
City of London, Wine Merchant. "IMPROVEMENTS IN FURNACES FOR GENERATING
STEAM." A communication from abroad by Seymour Alfred Mower, of Dhalla, in
the Town of Rangoon, in British Burmah, and John Pitt, of Kemendine, in Ran-
goon aforesaid.
The following is a Specification of a longitudinal and side feeding furnace, with
side Venetian grates, and triangular revolving under grates for generating steam
with paddy husk.
The novelty of this Invention for burning paddy husk is the mode of feeding or
supplying the furnace on each side of the boiler, and the side Venetian grates, and
triangular revolving under grates.
The furnace consists of two side cast-iron grates, marked a, a, in the annexed
Drawings, placed under the boiler at an angle of 50 degrees, and made on the
Venetian principle to admit sufficient air, and not to allow the husk to run through
into the ash-pit. The side gratings rest on cross bearers, which carry the two tri-
angular revolving under grates, marked b, running the whole length of the furnace.
These under grates form a trough, so that no husk can run through the open space
between the sloped grating. They can be made to revolve outwardly when neces-
sary to clear themselves from the dead ash. The three-bladed triangular revolving
D
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page_text: under grates are moved into position by turning a pair of mitre wheels driven by
hand or machinery.
When it is necessary to clear the furnace the man in attendance has only to turn
-the-handles-d-outwardly, and the dead ash drops away, and the body of red-hot
fuel which has been burning on the side Venetian grates, but which still contains
much heat, falls or is forced down by the fresh stuff into the trough formed by the
revolving under grates. Thus one-third of each revolution of the revolving under
grates first clears away-or-gets-rid-of-the-black-or-dead_ash, then the revolving
_grates receive the red-hot body of ash which has been burning in a flame on the
side Venetian grates, and allows fresh or new combustible matter-to follow or take.
its place on the side Venetian grates, by which means a continual feed of fuel is
kept up in the furnace.
The furnace is fed from both sides of the boiler for the whole length of the
furnace. The boiler is supported by cast-iron brackets, as shown at c.
In a double-fluid boiler of 30 horse power it requires 30 square feet of grate area
to evaporate a certain quantity of water to generate steam in a given time with
coals, but it takes 60 feet of grate area to evaporate the same quantity of water in
the same time with paddy husk, and the necessary amount of fuel to supply this
area is obtained by adopting this Invention of supplying the fuel longitudinally,
i.c., at the sides of the boiler. By this novel and simple contrivance of side feeding
any amount of grate area can be obtained, and thus the great difficulty in gene-
rating steam with paddy husk, the want of grate area, and the impossibility of
supplying fuel of this kind to a sufficient grate area is thoroughly overcome.
The paddy husk runs from the mill into a hopper, which is always kept full on
top of the boiler, and the furnace feeds itself from this hopper, thus doing away
with all labour in connection with the same.
What I claim is the construction of furnaces for generating steam, substantially
as described.
In witness whereof, I, the said Charles James Stewart, have hereunto set iny
hand and seal, this Twenty-third day of October, in the year of our Lord
One thousand eight hundred and seventy-eight.
T
C. J. STEWARI.
(LAS.)