Improvements in Means and Apparatus for Treating Smoke and Fumes.
Year: 1894

page_text: Date of Application, 23rd Oct., 1894-Accepted, 24th Nov., 1894
COMPLETE SPECIFICATION.
Improvements in Means and Apparatus for Treating Smoke
and Fumes.
1 JOSHUA ENTWISLE, Manager with the Firm of E. K. Dutton & Co., Chartered
Patent Agents, of 5 John Dalton Street, Manchester, in the County of Lancaster,
do hereby declare the nature of this invention (communicated to me from abroad
by William Lee Wallis, of Sharon, Pennsylvania, United States of America,
Manufacturer,) and in what mauner the same is to be performed to be particularly
described and ascertained in and by the following statement and accompanying
drawings:-
It is the object of my invention to utilize the gas generated in gas furnaces,
cupolas, smelting furnaces, and gas producers of all kinds, by separating the gas
in its passage from the generating chamber to the point of combustion, from all
impurities which are detrimental to the stove or furnace in which combustion takes
place; and which are also of value as a product, as the impurities consist of
fine ore and other particles which are thus saved, and which may be again returned
to the furnace for further treatment.
To
I have found that a peculiar kind of purifier is necessary in such a combination,
as it is essential that the separation shall take place without impeding or
interrupting the flow of gas through the purifier to the point of combustion, and at
the same time, that the separation which takes place shall be perfect.
successfully carry out the objects of the invention I have interposed between the
chamber where the gas is generated and the stove or furnace which presents the
point of combustion, a centrifugal purifier with an outlet therefrom for the purified
gas, and a receptacle for the fine particles which are separated by the action of the
purifier.
My invention therefore consists in a furnace or producer where gas is
generated, a stove or furnace where this gas may be consumed, and a centrifugal
purifier or separator interposed between the generating chamber and the point of
combustion.
My invention is illustrated in the accompanying drawings in which :-
Figure 1 represents in side elevation a complete apparatus, which includes my
said invention.
Figure 2 shows a vertical central section of the purifier, and
Figure 3 a transverse section of the purifier on line x-x of Figure 1.
In Figure 1 of these drawings, A represents a blast furnace, B the purifier, and
C.a stove, the generating furnace and the gas consuming stove being shown as
representative of their classes. From the blast furnace, the gases are forced by
the tuyeres through the flue D down to the purifier. These gases are generated
in the ordinary blast furnace or in like furnaces by the combustion of the stock,
and are forced by the blast to the stove or boiler furnace, where they are used
as fuel. In passing from the furnace stack, they carry with them fine particles
of ore, coke or other products of combustion in like condition, which are detrimental
to and prevent perfect combustion of the gases, and also clog up the pipes and
form a deposit on the hot blast stove, involving also a waste of ore and
other stock.
Separation of these fine particles from the gases must be accomplished without
interfering with the blast, and the results above stated are effected by the
particular form of purifier hereinafter described. The purifying chamber is shown
at d. It is in frusto-conical shape, largest at the base and is provided with a
lining capable of withstanding the high heat of the blast. It is provided on one

page_text: side with a curved entrance e, formed by a gradual enlargement on a curve from
the periphery of the cone at the base thereof, the construction being such that the
current entering at e' is carried in the direction of the arrows around the inner wall
of the chamber. The passage from the chamber is normally closed below, as
hereinafter explained, and the current therefore rises, continuing to circulate in
spiral form around the chamber.
In order that the current may escape without eddies into the down-take E, the
upper part of the purifier chamber is joined to the down-take by a curved and
gradually diminishing bend f, as shown in Figure 2. The rotary circulation of the
gases from bottom to top of the chamber is therefore not interfered with, and the
gases pass without obstruction to the stove or furnace C.
In the course of this circulation, by reason of the centrifugal force, the fine
particles of solid matter are thrown outward and therefore fall to the bottom. The
bottom of the chamber d, is joined to a reversed truncated cone g, to which is.
connected a pipe h, the reversed cone serving to direct the falling particles down to
the pipe h, and thence to the receptacle below. This pipe is closed by a sliding
trap valve i, at its mouth and below this is a chamber k, which receives the collected
dust and is provided with a discharge opening closed by a valve I.
The object of the two valves is to keep the purifier chamber closed, without
interfering with the discharge of the solid substances eliminated from the gas, and
for this purpose the upper valve is opened, while the lower is closed to allow such
substances to fall into the chamber k, and at proper intervals the upper valve is
closed and the lower opened to discharge the dust accumulating in the receptacles.
This permits the furnace to run continuously.
It will be understood that not only the purifier chamber but the passages should
be lined to resist the heat.
1
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is.
1. In combination, a gas generating chamber such as a furnace or gas producer,
a stove or furnace adapted to consume the gas forced thereto and a centrifugal
purifier for the gas interposed between the generator furnace and stove with an
outlet for the gas and a closed receptacle for the impurities, substantially as
described.
2. In combination with a gas generating chamber, a consuming stove or furnace
and an interposed gas purifier comprising a separating chamber into which the
gas is introduced tangentially, an outlet for the purified gas therefrom and a
collecting chamber having a valved entrance and a valved exit, substantially as
described.
Dated this 22nd day of October 1894.