IMPROVEMENTS IN ATMOSPHERIC BLAST SMOKE CONSUMING APPARATUS
Year: 1878

page_text: LETTERS PATENT to William James Chubb, of Greenwich, in the County of
Kent, for the Invention of "IMPROVEMENTS IN ATMOSPHERIC BLAST SMOKE
CONSUMING APPARATUS."
Sealed the 6th May 1879, and dated the 19th December 1878.
PROVISIONAL SPECIFICATION left by the said William James Chubb at the
Office of the Commissioners of Patents on the 19th December 1878.
WILLIAM JAMES CHUBB, of Greenwich, in the County of Kent.
IN ATMOSPHERIC BLAST SMOKE CONSUMING APPARATUS."
"IMPROVEMENTS
This Invention has for its object improvements in atmospheric blast smoke
consuming apparatus by means whereof not only are the smoke and other products
of combustion almost entirely consumed but an immense economy in the con-
sumption of fuel is effected.
To carry out my Invention I proceed as follows:-I construct a metal casing of
any suitable shape and dimensions, which consists of a conveniently shaped base
plate having two curvilinear and two vertical divisions or ribs resting upon it.
Each of these divisions or ribs are made hollow so as to form vertical and curvi-
linear flues which are connected together by central and transverse ribs while they
terminate at the bottom in a chamber formed in the base plate. The aperture of
this chamber opens out into the ash pit, and is regulated by means of a suitable
damper or valve and lever. The upper extremities of such rib flues form narrow
grooves or channels which extend across the entire width of the furnace and
discharge themselves into the open space above the metal casing through which the
products of combustion pass to the flue.
The metal casing is placed upon a foundation of concrete or other suitable
material just at the back of the furnace fire bars instead of the ordinary bridge.

page_text: This Invention is more particularly applicable to the furnaces of stationary
boilers, but it is also capable of adaptation to other stationary furnaces.
The operation of my Invention is as follows:-Owing to the variation in tem-
perature between the furnace and the ash pit, a strong current of air is attracted
towards the valve or damper and so enters the furnace itself by each of the narrow
grooves or chanuels before described. Such current of air upon entering the hollows
or flues formed in the ribs or divisions, as already mentioned, becomes intensely
heated during its passage therethrough, owing to such ribs or divisions being
exposed laterally to the heat of the fire, and such heated air commingling with the
unignited gases and fuel therein produces a perfect combustion, thus not only
preventing all, or almost all smoke, but diminishing in an immense degree the
consumption of fuel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William James Chubb in the Great Seal Patent Office on the 14th
June 1879.
WILLIAM JAMES CHUBB, of Greenwich, in the County of Kent.
IN ATMOSPHERIC BLAST SMOKE CONSUMING APPARATUS."
"IMPROVEMENTS
This Invention has for its object improvements in atmospheric blast smoke con-
suming apparatus, by means whereof not only are the smoke and other products of
combustion almost entirely consumed, but an immense economy in the consumption
of fuel is effected.
Figure 1 of the accompanying Drawings shews a longitudinal section, through
part of the fire box and flue, of a stationary steam boiler, shewing the application
of my Invention to the same.
Figure 2 shews a transverse section through the line A, B, Figure 1.
Figure 3 also shews a transverse section of the left hand half through the line C,
D, and of the right hand half through the line E, F, Figure 1.,
Figure 4 shows a semiground plan and horizontal section, the upper half being
a ground plan and the lower half a section through the line G, H, Figure 1.
part of the boiler flue, and b, b, are the fire bars.
a 18
To carry out my Invention I proceed as follows: I construct a metal casing of
any suitable shape and dimensions, which consists of a conveniently shaped base
plate c, c, having one vertical partition or division d, and two curvilinear partitions
or divisions d, d, resting longitudinally upon it. Each of these partitions or
divisions are made hollow so as to form vertical and curvilinear flues f, f, f, which
are connected together by a central and two end transverse ribs e, e, e, Figures 1
and 4, while they terminate at the bottom in an air chamber g, g, formed in the
base plate c, c. The aperture of this chamber opens out into the ash pit h, h, as
shewn in Figure 1 of the accompanying Drawings, and is regulated by means of a
suitable valve or damper i and lever k. The upper extremities of the flues f, ƒ ƒ,
form narrow grooves or channels which extend across the entire width of the
furnace and discharge themselves into the open space above the metal casing through
which the products of combustion pass to the flue.
Such metal casing is placed upon a foundation of concrete or other suitable
material al just at the back of the furnace fire bars b, b, instead of the ordinary
bridge.
In order to preserve the iron or other metal forming the casing I line the front
cheek or face thereof which is immediately above the fire bars b, b, with fire brick
(indicated at m), which fire brick facing is secured at the top by inserting it under
the curved metal flange indicated at n, Figures 1 and 2, and at the bottom by means
of the iron brace or bar indicated at n¹, in the same Figures, all the joints being
made thoroughly air tight with fire clay.
Such fire clay facing is hollowed out internally so as to form an additional flue
or opening o which at its base opens out into the ash pit h in a similar manner as
the air chamber g, g. This additional flue or opening does not extend to the top of
the metal casing as is the case with the other flues f, f, f, but instead thereof any
convenient number of lateral oblique openings or perforations p, Figures 1 and 2,
are pierced through the fire brick face m, through which the products of combustion
are driven by the strong current of air which enters such additional flue o at its
base, thus passing such products over the furnace fire and effecting their perfect
combustion.
In order to regulate the current of air so entering such additional flue o, I fit the
aperture at the base thereof with a suitable damper and lever arrangement similar
to that already described with reference to the air chamber 9, 9, and indicated at, r²,
in Figure 1 of the accompanying Drawings.

page_text: The difference in temperature between the ash pit h and the interior of the
furnace causes a strong current of air to enter by such valves or dampers, which,
passing into the furnace through each of the fluos f, f, f, o, is owing to the partitions
or divisions d, d¹, d¹¹, being laterally exposed to the heat of the fire and gases heated
during its passage therethrough, and mingling with the unconsumed gases and fuel,
not only causes the most perfect combustion, but prevents all smoke, and effects an
immense economy in the amount and cost of the fuel consumed, amounting to at
least 20 per cent.
This Invention is more particularly applicable to the furnaces of stationary
boilers, but it is also capable of adaptation to other stationary furnaces.
Having now particularly described and ascertained the nature of the said Inven
tion, and the manner of carrying the same into effect, I would have it understood
that I claim as my Invention the improved blast smoke consuming apparatus con-
structed and applied substantially in the manner and for the purposes hereinbefore
set forth and described.
In witness whereof, I, the said William James Chubb, have hereunto set my
hand and seal, this Eleventh day of June, in the year of our Lord One
thousand eight hundred and seventy nine.
Witness,
ELT & Co.
33, Southampton Buildings,
Holborn,
London, W.C
WILLIAM JAMES CHUBB. (L.S.)