Improvements in Apparatus for Condensing Smoke in the Furnaces of Steam and other Boilers.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Condensing Smoke in the Furnaces
of Steam and other Boilers.
I JOHN THOMAS ELLIS of 231 Barking Road, Canning Town, in the County of
Essex Engineer do hereby declare the nature of this invention and in what
manner the saine is to be performed, to be particularly described and ascertained
in and by the following statement
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My Invention relates to improvements in Apparatus for Condensing or destroying
smoke in the Furnaces or Fire-places of steain and other boilers and consists in
introducing in such Furnaces or Fire-places steam taken from the boiler dome,and
superheated in a coiled pipe provided with a fish tail nozzle and placed within the
furnace so that the heat thereof may superheat such steam previous to its issuing in
the form of a jet from the said nozzle and striking the smoke rising from the fuel so
as to draw the former back or form an eddy having for its object to decompose into
its constituent elements the water contained in such smoke, while the carbonaceous
constituents of the latter are consumed by the air admitted through the partially
opened door of the furnace
My Invention further relates to a balance box furnished with two compartments
formed by a perforated partition and partly filled with water, this box being connected
to the door of the furnace in such a manner as to regulate the gradual closing thereof
subsequently to its having been open for feeding purposes.
The object of this balance box is to allow of a sufficient quantity of air being
admitted in the furnace to consume the above mentioned carbonaceous constituents of
the smoke and for this purpose the amount of water placed in the balance box is so
calculated as to occupy the required time in passing from one compartment to the
other, that will enable the necessary quantity of air to be introduced in the furnace.
This balance box is so adjusted relatively to the furnace door as to operate
automatically for closing the same gradually. The said furnace door is further
connected to an admission valve arranged upon the steam pipe conveying the steam
from the dome to the coiled pipe within the fireplace, in such a manner that while air
is as above stated admitted into the furnace, steam is likewise admitted therein but
during a portion of the time only. And in order that my invention may be more
fully understood I have shown the same in the accompanying drawing in which
Fig 1 is a sectional elevation of a horizontal steam boilor provided with my improve-
ments. Fig. 2 is a front elevation of the said steam boiler Figs 3, 4 and 5 show
the three positions of the balance box az.-
z-When the furnace door is respectively
open, half opened or closed Fig 6 is a cross section on line of Fig. 4.
The steam pipe p issues from the dome D and leads to a smaller pipe p¹ which is
coiled just inside the furnace door its inner end which enters the furnace as shown being
provided with a fish tail nozzlo b from which two jets issue. The air enters
through the doorway at A The steam pipe is provided with a valve V whose
handle his connected by means of a cord or chain c passing under the bracket e to
the furnace door F. The balance box B is binged as shown in Fig 2 to the front of
the boiler setting and at its lower part is fastened one end of a cord & which passes
over the pulleys P₁ and P its other extremity being fixed in the centre of the door F.
As shown in Figs. 3, 4 and 5 the balance box is hermetically closed and has a
perforated partition mi which divides it into two equal parts 00'. When the furnace
has to be fed with fuel the furnace door F is opened by hand and the balance box
assumes the position shown in Fig. 3 When the furnace is fed the door F being left
alone, the water in the balance box gradually passes through the fine perforations of
the partition m from the compartment O¹ to the compartment O and brings the sand
balance box in the position shown in Fig. 4, the furnace door F being thereby moved
to its half closed position when it opens, by means of the cord c, the valve v of the

page_text: steam pipe and admits steam through the coiled pipe p₁ into the furnace air entering
at A through the furnace door F. The interval during which this door is to remain
half open is regulated by the time that will be occupied for the water to have entirely
fallen into the compartment o of the balance box B when the smoke having been
condensed the furnace door is closed and the balance box assumes finally the position
shown in Fig 5.
Whenever the furnace door is open for feeding purposes my improvements operate
automatically to condense the smoke issuing from the fuel.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
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1. In steam boiler furnaces the use of a coiled pipe placed within the furnace
provided with a fish tail nozzle and communicating with a steain pipe conveying
steam from the boiler dome to the said coiled pipe in combination with a balance box
connected with the furnace door and regulating the closing of the furnace door atter
the same has been opened for feeding purposes in such a manner that a quantity of
air sufficient for consuming the carbonaceous constituents of the smoke may be
admitted into the furnace while at the same time steam is admitted into the coiled
pipe aforesaid in consequence of the furnace door opening by means of a rod or chain
the steam admission valve placed on the above mentioned steam pipe, such steam
being first superheated in the furnace so as to issue from the fish tail nozzle
in the form of one or more jets striking the smoke issuing from the fuel
and driving it back in the form of an eddy for the purpose of decomposing the
water contained in the said smoke which is reduced to hot air substantially as and for
the purpose described
2. My improved balance box arranged, constructed and operating substantially as
and for the purpose described.
Dated this 21st day of October 1889
W. P. THOMPSON & BOULT,
Agents for the Applicant.