Improvements in Furnaces for Burning Town's and other Refuse applicable also to Furnaces for General Purposes.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands aiter
Amendment (under Section 18 of the Patents, &c. Act, 1883) as allowed by
the decision of the Comptroller General of the 30th day of November 1898.
Date of Application, 24th May,
1897
Complete Specification Left, 17th Dec., 1897-Accepted, 19th Feb.,
1898
Improvements in Furnaces for Burning Town's and other Refuse
applicable also to Furnaces for General Purposes.
I, GEORGE WATSON, of 21, Springfield Mount, in the City of Leeds, Engineer,
do hereby declare the nature of this invention to be as follows;-
-
In all furnaces which have a strong chimney draught whether natural or
induced there is a tendency for dust and even fragments of the burning material
to be carried up and out of the top of the chimney. In the case of destructors
for the burning of towns and other refuse this feature has led to complaints from
persons residing in the neighbourhood of such destructors. The object of the
present invention is to mitigate the nuisance referred to. For this purpose I
have designed the dust catching apparatus hereinafter described.
My apparatus consists of an outer chamber more or less circular in shape with
a downtake chimney in the centre thereof built up to and supporting the roof
of the chamber but having outlets near the roof through which the heated air
or gases may pass away from the outer chamber into the chimney. These outlets
are each of smaller capacity than the inlet flue from the furnace and are pro-
portioned so that their aggregate capacity will about equal that of the inlet Hue.
By this means and the general arrangement of the dust chamber, the heated air
or gases are made to swirl round inside the chamber and cast the dust and other
particles of material escaping from the furnace by centrifugal force against the
outer walls and into the bottom of the chamber where the air is stiller and cooler.
I provide two outlet flues from the downtake chimney one to convey the heated
air or gases to a steam boiler for the generation of steam, the other to convey
them away to the main chimney when it is not desired to heat the boiler. A covered
way is constructed from the outside of the outer chamber through the chamber into
the downtake chimney-and suitable doorways with doors are formed in the walls
of the outer chamber for the purpose of cleaning out as well the outer chamber as
the downtake chimney and the flues leading therefrom. I also provide spy holes
for the purpose of observing the heat in the dust chamber and downtake chimney
respectively.
The heated air or gases enter the dust chamber in front of a low baffle wall at
or near the mouth of the inlet flue from the furnace.

page_text: Improvements in Furnaces for Burning Town's and other Refuse,
applicable also to Furnaces for General Purposes.
:
I, GEORGE WATSON, of 21, Springfield Mount, in the City of Leeds, Engineer,
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 fol-
lowing statement:-
In all furnaces which have a strong chimney draught whether natural or
induced there is a tendency for dust and even fragments of the burning material
to be carried up and out of the top of the chimney. In the case of destructors
for the burning of town's and other refuse this feature has led to complaints from
persons residing in the neighbourhood of such destructors. The object of the
present invention, is, to mitigate the nuisance referred to. For this purpose I
have designed the dust catching apparatus hereinafter described.
My apparatus consists of an outer chamber more or less circular in shape with
a downtake in the centre thereof built up to and assisting to support the roof
of the chamber but having openings near the roof through which the heated air
or gases may pass from the outer chamber into the downtake on their way to the
chimney stack. These openings are each of smaller capacity than the inlet flue
from the furnace and are proportioned so that their aggregate capacity will about
equal that of the inlet flue. By this means and the general arrangement of the
dust chamber the gases are made to swirl round inside the chamber and cast the
dust and other particles of material escaping from the furnace by centrifugal
force against the walls and into the bottom of the chamber where there is less
motion of the gases. The sectional area of the chamber must be larger than the
inlet and outlet flues in order that the velocity of the gases passing through the
apparatus may be reduced and the dust consequently be the better deposited. The
gases are conveyed away from the downtake to the chimney stack my means of one
or more outlet flues constructed near the bottom of the downtake. The floor of
the outlet flue (or flues if more than one) is raised slightly above the bottom of
the downtake so as to form a well at the bottom of the latter.
When the gases
passing away from a destructor furnace are used for the generation of steam the
dust catcher may be and preferably is placed between the steam boiler
and the chimney so as not to cause loss of heat before the hot gases reach
the boiler. But the apparatus may be placed in any convenient position between
a furnace and a chimney. I sometimes use two outlet flues from the downtake
one to convey the gases to the steam boiler and the other to convey them to the
chimney stack without passing through the boiler one or both flues being furnished
with dampers or other shut off mechanism but in the following description and
in my drawings I describe the dust catcher with one outlet flue only. A covered
way fitted with a door at the outer end thereof is constructed from the outside of
the outer annular chamber through the chamber into the downtake and suitable
doorways with doors are formed in the walls of the outer chamber for the purpose
of cleaning out as well the outer chamber as the downtake and the flues leading
therefrom. And I provide spyholes for the purpose of observing the heat in the
dust chamber and downtake respectively. In the accompanying drawings Fig. 1
is a ground plan and Fig. 2 is a half sectional elevation along the centre line
of the passage G shown in Fig. 1, and Fig. 3 is a half front elevation of the
exterior comprised between the points X, Y, in Fig. 1 of a dust catcher constructed
according to my invention.

page_text: A is the outer skin or wall of the apparatus and is formed of brick or other
ordinary building material. The lining walls a, a, and all other internal walls
are built of fire bricks or other fire resisting material. B is the downtake B¹, are
the openings for the egress of the gases which enter the dust chamber D at the point
marked C. C is a flue from the furnace and the space over the top of the flue
is open to the roof of the dust chamber E is a low baffle wall in front of the inlet
flue C. F, F are the side walls of the passage G from the outer air into the down-
take. H is a flue to lead the gases away from the downtake to the chimney stack
and the space over the top of the flue as well as over the passage G is open to
the roof of the dust chamber. 1, 2 and 3 are respectively hollow places or pits
formed by the baffle wall the side walls of the passage G and of the outlet flue H
hereinbefore described with passages L, M, N, respectively into them from the out-
side for the purpose herein before mentioned L M N are respectively iron door
frames let into the outer walls and furnished with iron doors to close up the open-
ings. O is a spy hole for the purpose of observing the heat in the dust chamber
and P is a similar hole placed opposite one of the outlet holes into the downtake
for the purpose of observing the heat thereof, I I I are iron bands to tie the out-
side walls together and the dotted lines are tie rods constructed in the floor, the roof
and the side walls of the structure to bind the whole together.
I am aware that it is not new to use a dust catching apparatus intermediate
between the furnace and the chimney and I do not desire to make a broad claim
to such apparatus, but I believe the arrangement which I have devised to be new.
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;.
-
The use in connection with furnaces for the destruction of town's and other refuse
as well as in connection with furnaces in general of a dust catching apparatus
intermediate between the furnace and the chimney the essential parts whereof are
a circular or more or less circular outer chamber wherein the gases swirl and tend
to throw the dust outward against the surrounding walls of the chamber by centri-
fugal force and an internal chamber or well or downtake provided with openings
in the upper part thereof for the admission thereto of the gases for the purpose of
drawing off the same from the outer chamber and an outlet flue at or near the
bottom for the conveyance of such gases to the chimney and means for the removal
of dust and other material arranged and operating substantially as described.
Dated this 16th day of December 1897.