Improvements in Smoke Consuming Furnaces.
Year: 1890

page_text: Date of Application, 8th Dec., 1890
Complete Specification Left, 7th May, 1891-Accepted, 27th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Smoke Consuming Furnaces.
I, HERBERT JOHN HADDAN, of the firm of Herbert & Co., Patent Agents, of
18, Buckingham Street, Strand, W.C., London, Civil Engineer, do hereby declare
the nature of this invention a communication to me from abroad by Arnold
Brecher, of 167 Dearborn Street, Chicago, County of Cook, State of Illinois,
United States of America, Manufacturers Agent, to be as follows:-
The invention relates to boiler furnaces, that is to say, furnaces wherein water
contained in a boiler forming a part of the furnace is to be converted into steam by
the heat obtained by the combustion of coal or coke in the furnace. The object
of this invention is to obtain a device which can be attached to an ordinary boiler
furnace, and wherein in the completed furnace thereby secured such perfect. com-
bustion will be obtained of the coal forming the fuel consumed in the furnace that
little, if any, smoke is made from the smoke stack of the furnace even when such
furnace is being fired.
The following is a full and complete description of the invention and of a boiler
furnace having the inventions attached thereto, when taken in connection with the
drawing accompanying and forming a part hereof.
In order to accomplish the results sought as aforesaid, in the device obtained by
the combination of the inventions herein described with the devices in common use
in boiler furnaces, it is necessary to provide an arrangement for taking the contents
of the smoke stack, or smoke passage of the furnace, and returning such material
or materials to the furnace above the grate bars of the combustion chamber; to
provide means for introducing air through the bridge wall of the furnace to the
products of combustion or partial combustion passing thereover from the com-
bustion chamber, such air so passing through the bridge wall to be forced through
the passage or way provided therefor by a fan, or to be drawn through by the
natural draft, as it may be termed, of the furnace, as preferred; and further, to
introduce a current of air, under pressure, to the ash-pit of the furnace, thereby
creating, when the doors of the ash-pit are closed, a greater pressure of air in the
ash-pit than in the combustion chamber or in the room surrounding the furnace.
In the drawing,
Fig. 1 is a front elevation of the boiler furnace having the inventions attached
thereto;
Fig. 2 a plan thereof;
Fig. 3 a cross section on line 3-3 of Fig. 2 and
Fig. 4 a longitudinal section on line 44 of Fig. 2.
Like letters refer to the same part throughout the several views thereof.
A is the boiler front; A¹ the enclosing walls of the boiler; A' the boiler; A' the
line of the bridge wall; A' the ash-pit; a, a, the ash-pit doors; B the combustion
chamber; B' the grate bars; and B³ a fan.
The fan B' is connected to and with the smoke stack C by pipe C¹. C' is a
discharge pipe extending from the fan to both sides of the boiler furnace, and
C, C, are branch pipes which extend along the side walls of the boiler furnace.
C, C, are pipes extending from branch pipes C³, C³, to and into the combustion
chamber B. It will be observed that the pipe C is illustrated as extending across
and in back of the boiler front A ; and the branch pipes C³, C³, as extending along

page_text: When the fan B is in operation the heated products from the combustion
chamber passing into the smoke stack or smoke passage C and withdrawn therefrom
by the fan are forced into the combustion chamber above the grate bars thereof.
D' is a pipe imbedded in the bridge wall D, and pipes D2, D', extend from pipe D'
to the upper face of the bridge wall. Valves D³, are placed in pipe D'. E is a
space in the bridge wall D; having openings E', E', extending from space E to
the face of the bridge wall in the ash-pit A, and pipe E2 extending from space E
to fan F; and forming the discharge pipe of such fan. F¹ is a pipe which may
extend from the fan F to any part of the chamber wherein the furnace is located,
or to the outer air, as preferred. Unless it is desired to extend the pipe F to the
outer air or to the top part of the furnace chamber or room the pipe F' is not
considered necessary and in no case is it considered an essential part of the
invention.
When the ash-pit doors, a, a, are closed and the fan F is in operation air is forced
through the pipe E' space E and openings E', E', into the ash-pit A' and a greater
pressure of air thereby produced in such ash-pit than obtains in the combustion
chamber B and an artificial blast of air is thereby forced through the grate
bars into the combustion chamber. While air is contained, under pressure, as
stated, in the ash-pit it is heated to a considerable higher temperature than the air
surrounding the furnace and as it is forced into the combustion chamber such
portion of said air as is not required to enter into the combustion of the contents of
the combustion chamber below the line of the openings of pipe C, C is well
adapted to combine with and assist in the combustion of the contents of the
pipes C, C as such contents are delivered into the combustion chamber.
When it is desired to force or apply pressure to the air passing through pipes D',
and D2, and from thence entering the furnace, the pipes D are connected with one
of the branch pipes C³; it has been found such results can be attained by simply
leaving the ends of the pipe D', open thereby securing what is termed a natural
draft through these pipes D', D2, that it is preferred ordinarily, not to connect
this pipe D to pipe C³.
It will be seen that in the device obtained by the combination of the several
herein before described elements the contents of the smoke stack, or smoke passage,
withdrawn therefrom by the fan are returned and forced into the combustion
chamber of the furnace and in combination therewith air obtained either from
within or without the building wherein the furnace is placed is forced into the
ash-pit and from there through the grate-bars into the combustion chamber, and
also in this device air is supplied, either under pressure or not under pressure, as
preferred, obtained from within or from without such building, through openings in
the bridge wall to intermingle with the smoke, gases, or other products of partial
combustion passing over such bridge wall from the combustion chamber and into the
smoke stack or smoke passage.
The amount of air forced into the ash-pit is regulated by the size and speed of
the fan, and by the dampers f,f; and the amount of smoke, gases, or other products
of partial combustion supplied to the combustion chamber from the smoke stack or
smoke passage is also determined in the same way.
Dated this 8th day of December 1890
HERBERT & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Smoke Consuming Furnaces.
I HERBERT JOHN HADDAN of the firm of Herbert & Co., Patent Agents of
18 Buckingham Street, Strand W.C. London Civil Engineer do hereby declare
the nature of this invention, a communication to me from abroad by Arnold
Brecher of 167 Dearborn Street, Chicago, in the County of Cook, State of Illinois,
United States of America, Manufacturers Agent and in what manner the same is

page_text: to the outer air or to the top part of the furnace chamber or room the pipe Fis
not considered necessary and in no case is it considered an essential part of the
invention.
When the ashpit doors a a are closed and the fan F is in operation air is forced
through the pipe E' space E and openings E' E' into the ashpit A' and a greater
pressure of air thereby produced in such ashpit than obtains in the combustion
chamber B and an artificial blast of air is thereby forced through the grate bars
into the combustion chamber. While air is contained under pressure as stated in the
ashpit it is heated to a considerably higher temperature than the air surrounding
the furnace and as it is forced into the combustion chamber, such portion of said
air as is not required to enter into the combustion of the contents of the com-
bustion chamber below the line of the openings of pipe C C is well adapted to
combine with and assist in the combustion of the contents of the pipes C* C* as
such contents are delivered into the combustion chamber.
When it is desired to force or apply pressure to the air passing through pipes D¹
and D2 and from thence entering the furnace, the pipes D₁ are connected with one
of the branch pipes C³ it has been found such results can be attained by simply
leaving the ends of the pipe D' open thereby securing what is termed a natural
draft through these pipes D' D' that it is preferred ordinarily not to connect this
pipe D' to pipe C³.
It will be seen that in the device obtained by the combination of the several
hereinbefore described elements the contents of the smoke stack or smoke passage
withdrawn therefrom by the fan are returned and forced into the combustion
chamber of the furnace and in combination therewith air obtained either from
within or without the building wherein the furnace is placed is forced into the
ashpit and from there through the grate bars into the combustion chamber, and
also in this device air is supplied, either under pressure or not under pressure, as
preferred, obtained from within or from without such building through openings in
the bridge wall to intermingle with the smoke, gases, or other products of partial
combustion passing over such bridge wall from the combustion chamber and into
the smoke stack or smoke passage.
The amount of air forced into the ashpit is regulated by the size and speed of
the fan, and by the dampers F2 and the amount of smoke, gases, or other products
of partial combustion supplied to the combustion chamber from the smoke stack or
smoke passage is also determined in the same way.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is―
1. In a smoke consuming furnace the combination of a fan, a pipe extending
from the smoke passage of the furnace to the fan, a pipe extending from the fan to
the combustion chamber of the furnace, and a pipe open at the end imbedded in the
bridge wall of the furnace and having branch pipes extending to the inner face of
the bridge wall, whereby the contents of the smoke passage withdrawn therefrom
by the fan are returned to the combustion chamber, and air is supplied to the
heated contents of the combustion chamber, passing over the bridge wall and into
the smoke passage; substantially as described.
2. In a smoke consuming furnace the combination of a fan, a pipe extending
from the smoke passage of the furnace to the fan, a pipe extending from the fan to
the combustion chamber of the furnace, a second fan, a pipe extending therefrom
into the ashpit of the furnace and dampers in such pipe whereby the contents of
the smoke passage withdrawn therefrom by the first named fan are returned to the
combustion chamber of the furnace and air is forced into the ash pit and from
there into the combustion chamber through the grate bars thereof substantially as
described.
3. In a smoke consuming furnace, the combination of a fan, a pipe extending

page_text: from the smoke passage of the furnace to the fan, a pipe extending from the fan to
the combustion chamber of the furnace, a pipe open at the end imbedded in the
bridge wall of the furnace and having branch pipes extending therefrom to the
inner face of the bridge wall, a second fan and pipe extending therefrom into
the ashpit, whereby the contents of the smoke passage withdrawn therefrom by the
first named fan are returned to the combustion chamber of the furnace, air is
supplied to the heated matter leaving the combustion chamber and passing over
the bridge wall to the smoke passage, and air is forced into the ashpit and from
there to the combustion chamber through the grate bars thereof substantially as
described.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant