Improvements in Apparatus for Promoting the Combustion of Fuel in Steam Boiler and other Furnaces.
Year: 1886

page_text: Improvements in Apparatus for Promoting the Combustion of
Fuel in Steam Boiler and other Furnaces.
I, HERBERT JOHN HADDAN, of 67, Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by Henry Welsh, Merchant, of 115 Broadway, New York, United
States of America, and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
In the accompanying drawing:
Fig. 1 is a side view.
Fig. 2, a vertical cross-section on the line x, x, Fig. 1; and Fig. 3 a rear end
elevation of a generator with my invention attached.
The object of the invention is to admit a body of air into or above the
incandescent fuel in the furnace to inflame the unconsumed combustible matter
which ordinarily pass away from the fire, and the invention consists; in the
attachment of a conductory leading from the atmosphere to one or more improvised
flue spaces located adjacent to the furnace and communicating therewith through
a perforated partition; and in providing said conductory with branch pipes
connecting the same with the chimney or intermediate connections, said branch
pipes being fitted with dampers for closing the same or regulating the admission
of the heated gases; and in applying a steam jet to the atmospheric inlet of the
conductory to assist its natural draft.
In the accompanying drawing I have illustrated the invention connected' with a
sectional steam generator, although it is equally applicable to other types of
generators and also to furnaces adapted to other purposes.
Referring to the drawing A is the furnace, B the smoke connection adjacent to
the chimney, C the air conducting tubes; D the flue spaces, adjacent to the furnace.
with which the air conducting tubes C communicate; a, a, dampers located in the
branch pipes b, b, leading from the smoke connection B, to the conducting tubes C;
d, a steam jet arranged as shown at the flaring mouth of the conducting tubes C,
and e are perforated partitions between the furnace A, and the flue spaces D.

page_text: In operation, atmospheric air enters the conducting tubes C, through which it is
directed to the flue spaces D, and through the perforated partitions e, to the
furnace A.
The entering air is preferably distributed above the fuel so as to combine with
the rising combustible gases and thereby supply such an additional amount of
oxygen as to produce a more perfect combustion.
The branch pipes bare designed to admit such a portion of the heated escaping
gases, that will elevate the temperature of the entering air and increase the
natural draft of the air tubes, the volume of such admitted heated gases being
regulated by the adjustment of the dampers a, located in said branch pipes bas
shown in Fig. 3.
.
The steam jet d applied as shown in Fige 1 and 3 at the mouth of the air
conducting tubes is composed of crossed branch pipes closed at their outer ends and
perforated to direct the jets of steam issuing therefrom into the mouth of the
air conducting tubes C, which also assists their natural draft, the steam being
drawn from any convenient part of the steam space of the generator, and regulated
by an intermediate stop cock.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
-
In an apparatus for conducting atmospheric air to the furnace of a steam
generator, or other fuel chamber, the combination with one or more pipes open to
the atmosphere at one end, and forming a communication with one or more flue
spaces located adjacent to the furnace and separated therefrom by a perforated
partition, of a branch pipe, or pipes, leading from the chimney provided with
dampers to regulate the admission of the heated gases, and a steam jet located at
the mouth of the air conducting pipes, substantially as described.
"