Year: 1886

page_text: 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. Fig 4 and 5 illustrate modifications of the invention to suit
other types of generators which will be readily understood on inspection.
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 there with 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 C₁ 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, Fig. 3, 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 or 04, 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 6 and 61 are 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 b as
shown in Fig. 3.
The steam jet applied as shown in Figs 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:-
1. 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.
2. In an apparatus, substantially as described, the arrangement of air conducting
pipes, substantially as shown in Figs 4 and 5 of the drawing annexed.
2000