Improvements in Apparatus for the Prevention or Consumption of Smoke in Steam Boilers.
Year: 1895

page_text: Date of Application, 5th Feb., 1895
Complete Specification Left, 1st Nov., 1895-Accepted, 7th Dec., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for the Prevention or Consumption of
Smoke in Steam Boilers.
I FRED YEADON, of 40 Parson Lane, Clitheroe, Lancashire, Clogger, do hereby
declare the nature of this invention to be as follows:-
The improvements relate to apparatus for the prevention or consumption of smoke
in connection with steam boilers and have for object the abstraction of the
tarry or carbonaceous particles from the products of combustion between the
furnace and the chimney by means hereinafter to be described.
The improvements are particularly adaptable to boilers constructed for internal
firing, but may be modified so as to be applicable to externally fired boilers.
To accomplish this and to effect my improvements, I connect to the outlet of the
gases from the boiler furnace a tube or flue which is surrounded with a jacket or
annular steam space. This annular space is connected by means of a pipe provided
with a suitable inlet valve to the steam space of the boiler, and thereby enabled
to be filled with steam. It may also be provided with an outlet valve or ejector for
getting rid of condensed steam which may accumulate.
The tube or Hue, thus jacketed with steam, is constructed of sufficient length
for its purpose, and is provided with a damper at its entrance to control the outflow
of the gases from the furnace, while the outer end of such tube or flue terminates
in a chamber or catch box, acting as, or communicating with a tar well, into
which the tarry or other carbonaceous matters condense in liquid form and from
which they may be drawn for further treatment or otherwise as required. The
aforesaid chamber or catch box is provided with an opening to the chimney and
with a damper to control the final outlet of the gases. I prefer also to provide a
second outlet to this chamber, and thereby connect the chamber with a return tube
to the front part of the furnace, so as to enable any portion of imperfectly treated
gases or smoke to be passed through the furnace again by means of either a
natural, induced, or fan draught. When a forced blast is employed, I prefer to
place the fan in the circuit of this return tube; but the position and arrangement
of such fan may be varied. Also, in lieu of a fan, I may employ a steam jet or
other means for inducing the return of a portion of the smoke or gases as
aforementioned.
Variations in detail, such as the form, position, direction and material of the
separate parts may be inade without departing from the peculiar character of the
invention.
Dated this 4th day of February 1895
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester, Agent.

page_text: Improvements in Apparatus for the Prevention or Consumption of
Smoke in Steam Boilers.
I FRED YEADON, of 40 Parson Lane, Clitheroe, Lancashire, Clogger, 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:-
The improvements relate to apparatus for the prevention or consumption of
smoke in connection with steam boilers, and have for object the abstraction of the
tarry or carbonaceous particles from the products of combustion between the furnace
and the chimney by means hereinafter to be described.
The improvements are particularly adaptable to boilers constructed for internal
firing, but may be modified so as to be applicable to externally fired boilers.
To accomplish this, and to effect my improvements, I connect, to the outlet of
the gases from the boiler furnace, a tube or flue which is surrounded with a jacket
or annular steam space. This annular space is connected, by means of a pipe
provided with a suitable inlet valve, to the steam space of the boiler, and thereby
enabled to be filled with steam.
It may also be provided with an outlet valve or ejector for getting rid of
condensed steam which may accumulate; or the jacket may be in communication
with the water space of the boiler, and so contain water as well as steam, by which
means this ejector may be dispensed with.
The tube or flue, thus jacketed with steam, or steam and water, is constructed of
sufficient length for its purpose, and is provided with a damper at its entrance, to
control the outflow of the gases from the furnace, while a convenient point at the
outer end of such tube or flue terminates in a chamber or catch box, acting as, or
communicating with a tar well, into which the tarry or other carbonaceous
matters condense in liquid form, and from which they may be drawn for further
treatment, or otherwise, as required. To further assist this deposition of tarry
matter, I may provide a steam jet which projects steam into the flue before-
mentioned.
The aforesaid chamber or catch-box is provided with an opening to, or is
connected by a continuation of the flue to the chimney, and also with a damper to
control the final outlet of the gases. I may also provide, if requisite, a second
outlet to this chamber, and thereby connect the chamber with a return tube to the
front part of the furnace so as to enable any portion of imperfectly treated gases
or smoke to be passed through the furnace again by means of either a natural,
induced or fan draught.
When a forced blast is employed, I prefer to place the fan in the circuit of this
return tube; but the position and arrangement of such fan may be varied. Also,
in lieu of a fan, I may employ a steam jet or other means for inducing the return
of a portion of the smoke or gases as aforementioned.
But that the improvements may be better understood, I will, with the aid of the
accompanying drawings, proceed more fully to describe means employed by me.
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page_text: a. a. is the boiler, in this case internally fired, and b. is its flue, connected at its
outlet, to a special flue c. c¹ c². This special flue is surrounded by an annular space
or jacket d. d d to which steam is admitted by the pipe e. from the steam space
of the boiler a. and, in the example shewn, the jacket is in communication with the
water space of the boiler, though, when desired, this communication may not be
provided, when the steam would be supplied to the jacket through the pipe only.
The heated gases from the flue pass into the extended flue c., being controlled
by the damper g., and thence ascend by the vertical branch c¹ to the upper
portion, and so to the chimney h.
e.
k. is a second damper at the entrance to the chimney and I are covers, or man or
hand-hole lids which may be removed for cleaning the flues.
By this arrangement, the carbonaceous particles from the products of combus-
tion are caused to adhere to the sides of the flues or otherwise intercepted in lieu
of passing away through the chimney.
m. is a steam pipe connecting the steam space of the boiler with the interior of
the flues. The admission of a small quantity of steam, controlled by the cock or
valve m' assists in enabling the carbonaceous matter to be carried along the flues
to the branch c³ down which it falls into the chamber or catch-box n. which may
act as, or communicate with a tar well.
By the means described, the products of combustion escaping through the
chimney are greatly purified.
Variations in detail, such as the form, position, direction and material of the
separate parts may be made without departing from the peculiar character of
the invention.
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 :-
1. In apparatus for the prevention or consumption of smoke in steam boilers, a
special flue or flues, provided with annular jackets, whereby heated water or steam
or both may surround the outside of such flues, for the purpose of intercepting
the tarry or carbonaceous matter, and in inanner substantially as herein shewn
and described.
2. The combination of apparatus for the prevention or consumption of smoke in
steam boilers, in macner substantially as herein shewn and described.
Dated this 31st day of October 1895.
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester, Agent.