Improvements in Apparatus for Consuming Smoke.
Year: 1899

page_text: Date of Application, 16th Mar., 1899
Complete Specification Left, 15th Deo., 1899—Accepted, 20th Jan., 1900
Improvements in Apparatus for Consuming Smoke.
I, THOMAS NURSE, of William Cottage, Old James Street, Peckham Rye, in
the County of Surrey, Tinsmith, do hereby declare the nature of this invention.
to be as follows;-
-
This invention relates to furnaces of all kinds, kilns, stationary and locomo-
tive engines, slow combustion and other stoves or open grates for domestic pur-
poses and the like, and consists in or of a return flue combined with an air
inlet by which the products of combustion after passing through a convenient
length of flue return under or into the fire and are there mingled with fresh air
from the said inlet. For slow combustion stoves or barless stoves or grates I
reintroduce the end of the return flue with flared mouth up above the
base of the bed of the furnace, The object being in all cases to let the return
smoke and gases pass to or near the middle of the burning fuel, and so get.
thoroughly incorporated with it and reburnt so as to consume all the smoke
and previously unconsumed gases therein. The flue is made larger at the throat
and start and gradually smaller to the return outlet under or in the fire, with stop
valve and a wheel or fan with or without power for driving the smoke.
Dated this 16th day of March 1800
Improvements in Apparatus for Consuming Smoke.
I, THOMAS NURSE, of William Cottage, Old James Street, Peckham Rye, in
the County of Surrey, Tinsmith, 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:—
This invention relates to furnaces of all kinds, kilns, stationary and locomo-
tive engines, slow combustion and other stoves or open grates for domestic pur-
poses and the like, and consists in, or of a return, flue combined with an air
inlet by which the products of combustion after passing through a convenient
length of flue return under or into the fire and are there mingled with fresh air
from the said inlet. For slow combustion stoves or barless stoves or grates I
re-introduce the end of the return flue with or without flared mouth up above the
base of the bed of the furnace, The object being in all cases to let the return
smoke and gases pass to or near the middle of the burning fuel, and so get

page_text: thoroughly incorporated with it and be reburnt so as to consume all the smoke
and previously unconsumed gases therein. The flue is made larger at the throat
and gradually smaller to the return outlet under or in the fire, with stop valve
and a wheel or fan with or without power for driving the smoke.
The accompanying drawing shows the invention as applied to a Cornish boiler
but the principle may with suitable modifications be adapted to boilers and fur-
naces of all kinds as well as to various stoves or open grates for domestic or other
use.
A is the boiler, A¹ the brickwork or masonry supporting it, B the flue'running
through the same as usual in this class of boiler and C the grate at one end
thereof. The smoke and partially burnt gases pass along said flue and through
the two branch pipes or flues B¹ B to the chimney D, The smoke and gases are
however hindered from escaping to the atmosphere by the damper E and are
compelled to pass along the return flue F which leads them into a hood G suit-
ably formed arranged preferably in front of the boiler. This hood_combined
with the natural draught created at this point causes the smoke and gases to
again pass upwards through the fire to be again burnt. The said return flue is
made larger in diameter at the end nearest the chimney and gradually diminishes
towards the other end where it may be provided with a fan or blower F¹ for assis-
tance in drawing the smoke and gases again to the grate. A stop valve or
damper El may also be provided in the return flue this damper being operated
by suitable rods controlled by handle E or other convenient means.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to we performed, I declare that what
I claim is:-
In apparatus for consuming smoke in boilers, furnaces, grates and stoves of
all kinds the combination of a return flue, decreasing in diameter towards its
outlet and preferably provided with a suitable damper or stop valve and blower
or fan, leading from the main flue or chimney back again to below the fire or
grate with or without a suitably formed hood for directing the smoke and gases
to the said fire or grate and increasing the draught substantially as described.
Dated this 15th day of December 1899
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C.