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Патент USA US2124122

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July 119, 1938.
2,124,122
W. RAISCH
INC INERATION
Filed Nov; '7, 1956
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2,124,122
Patented July 19, 1938
UNITED
TA'E‘S
PATET ’ fl
FEQE
2,124,122
INCINERATION
William Raisch, New York, N. Y., assignor to
Underpinning & Foundation (10., Inc., New
York, N. Y., a corporation of New York
Application November 7, 1936, Serial No. 109,616
7 Claims.
The present invention relates to incineration
and more particularly to improvements in proc
esses of incineration and in multiple-hearth fur
(Cl. 110-12)
.
Fig. l is a View in vertical section of an im
proved embodiment of the invention; and
Fig. 2 is a section on the line 2—2 of Fig. 1.
naces in which the material to be treated is fed
downwardly from hearth to hearth and at one
hearth the ?ow of air and gases along the path
Referring to the drawing, the invention may
be embodied in a furnace It provided with a
followed by the solid material is prevented, thus
which the hearth l'l serves as a bottom of the
furnace or furnace chamber.
dividing the furnace into two sections, one of
which may be used only for drying and the other
10 only for burning thus enabling better control
of temperatures and flow of. gases through the
two sections.
.
The principal objects of the invention are to
provide novel, advantageous and efficient forms
top H and hearths l2, I3, 54, l5, l6 and H, of
The material to be treated may be introduced‘
into the furnace and deposited upon the upper
most hearth l2 through a hopper l8 and a chute
I 9 extending through the top H of the fur
nace and provided with a pivoted door or gate
2t normally held closed by suitable means such
15 of apparatus and processes for effecting treat
as a weighted arm 25.
ment vof the general character speci?ed. An
other object is to provide improved means for
heating in the furnace itself air and gases pass
ing from the drying section to the burning sec
20 tion. A further object is to provide, in a fur
amount of material to overcome the action of
the weighted arm 2! collects on the door or
nace comprising an upper drying section and
a lower burning section, means for conducting
air and vapor from the drying section to the
burning section in heat exchange relation to
25 the hot gases in the burning section before dis
charging the air and gases into the burning
section,
In carrying out the invention in a preferred
manner, use may be made of a multiple-hearth
furnace separated into an upper or drying sec
tion and a lower or burning section by a hearth
having one or more outlets for discharge of
solids to the next lower hearth, and a gas seal
for each outlet. By use of such gas seals, it is
made possible to control to better advantage the
flow of air and gases through the drying and
burning sections.
Air preferably preheated is
supplied to the upper part of the drying sec
tion and withdrawn from the lower part of
40 this section into downwardly extending ducts
at the inner surface of the peripheral wall and
discharging into the lower part of the burning
section through which the draft is upward to
an outlet or discharge opening in the upper
45 part of the burning section.
The ducts may
be made of material adapted for heat inter
change between hot gases in the burning sec
tion and the air and vapors passing through the
ducts to the lower part of the burning section.
The hot gases from the burning section may
be used to preheat air supplied to the drying
section.
Other objects, features and advantages will
appear upon consideration of the following de
55 scription of the drawing, in which:
As soon as a suf?cient 15
gate 20, the door swings downwardly about its
pivotal support and permits the material on
the door to fall to the hearth l2.
As illustrated, this material falls on the hearth
l2 near its periphery and is worked inwardly
to a central discharge opening 22 by suitable
rabbling means including one or more radial
arms 23 and inclined blades 24 carried thereby.
Below the hearth E2, the hearths I?» and 15 are
provided with peripheral outlets 25, the hearths
Ill and it are provided with central outlets 22
corresponding with the central outlet of the
hearth l2, and the lower hearth ii is provided 30
with a single outlet or chute 26 through which
the ash is discharged from the furnace. The
chute 26 is preferably provided with a gas seal
in the form of a pivoted door 21 normally held
in closed position by a weighted arm 28.
35
The material on the hearths it, Hi, l5, I6 and
H is moved towards the corresponding outlets
by suitable rabbling means similar to that used
above the hearth l2, the blades 28 above the
hearths l3, I5 and H being so inclined as to
carry the material outwardly to the peripheral
outlets thereof, and the blades above the hearths
Ill and It being so inclined as to work the ma
terial toward the central opening as in the case
4:5
of hearth [2.
The rabbling arms 23 may be supported and
operated by a hollow vertical shaft 29 passing
through the central parts of the central outlets
22 of the hearths l2, l4 and i6 and through
small openings in the top I l and the hearths 50
I3, l5 and I1, suitable gas seals being provided
where the shaft 29 passes through the top and
these hearths. The shaft 29 may be rotated in
any suitable manner as by means of a bevel
gear 30 thereon, a bevel gear 3i meshing with 55
2
2,124,122
the bevel gear 33, and a pulley 32 connected with
the bevel gear 3| and driven from any suitable
a peripheral wall, vertically spaced hearths with
outlets through which material introduced at the
source of power.
top of the furnace is passed from hearth to hearth
to the lowermost hearth and then discharged
The hearth l3 may be used to divide the fur
nace into an upper drying section and a lower
burning section. Although this hearth may have
more than one outlet 25, it may be desirable to
have only one outlet to render it more easy to
effect gas sealing at this hearth. As illustrated,
10 use is made of a sweep valve 33 including a tube
34 in the outlet 25 and extending downwardly
to a level slightly above a ?xed shelf 35 on which
the material piles up and normally closes the
lower end of the tube 34, and one or more sweep
members 36 carried by rabble arms 23 in the
compartment below the hearth l3.
It will be
evident that each time a sweep 36 removes some
material from a shelf 35, the material in the
corresponding tube or chute 34 settles without
20 breaking the gas seal.
In the drying and burning operation, air, pref
erably preheated, is supplied to the drying sec
from the furnace, means at the outlet of one
hearth for preventing the passage of gases and
dividing the furnace into an upper drying sec
tion and a lower burning section, means for sup
plying air to the drying section and means for
discharging hot combustion gases from the higher
part of the burning section, of means for con
ducting air and vapor from the drying section
downwardly in heat-exchanging relationship with
the combustion gases in the burning section, and
discharging the air thus heated into the lower 15
part of said burning section.
2. In apparatus of the class described, the com
bination with a multiple-hearth furnace having
a peripheral wall, vertically spaced hearths with
outlets through which material introduced at the 20
top of the furnace is passed from hearth to hearth
to the lowermost hearth and then discharged
tion and after acting on the material therein is
from the furnace, means at the outlet of one
passed, together with vapors taken up in the
drying section, into the burning section where
hearth for preventing passage of gases and divid
it aids combustion. All noxious odors are elimi
nated and the hot combustion gases are dis
charged from the furnace. Air may be supplied
to the drying section by means of a fan 3'! and
30 a duct 33 leading to the uppermost compartment
of the drying section. The air thus supplied may
be preheated by passing it through a heat ex
changer 39.
The preheated air is reduced in temperature
and takes up vapors of moisture and volatile ma
terial in passing through the drying section and
it is therefore desirable to supply more heat there
to before it is discharged into the burning sec
tion. Preferably this is done by means of ducts
40 or pipes 40 partially embedded in the peripheral
wall of the furnace at its inner surface. The
ducts or pipes 40 may be made of high heat re
sisting material and may be provided at their
upper ends with lateral inlets 4| communicating
45 with the interior of the lower compartment of
the drying section, and with lateral outlets 42
communicating with the lowermost compartment
ing the furnace into an upper drying section and - »
a lower burning section, means for supplying air
to the drying section and means for discharging
hot combustion gases from the higher part of the
burning section, of means including downwardly
extending ducts at the inner surface of said pe- .
ripheral wall for conducting air and vapor from
the drying section downwardly in heat exchanging
relationship with the combustion gases in the
burning section, and discharging the air thus
heated into the lower part of said burning section.
3. In apparatus of the class described, the com
bination with a multiple-hearth furnace having a
peripheral wall, vertically spaced hearths dividing
the furnace into compartments and provided with
outlets through which material introduced at
the top of the furnace may pass from hearth to
hearth to the lowermost hearth and then be dis
charged from the furnace, means at the outlet
of one hearth for preventing the passage of gases
and dividing the furnace into an upper drying sec
tion and a lower burning section, means for sup
plying air to the drying section and means for dis
of the burning section. The upper and lower ends
of the pipes 40 may be in engagement with or
50 embedded in the hearths l2 and I1 respectively.
It is desirable to provide burners 43 for use in
downwardly in heat-exchanging relationship with
starting the apparatus or in raising the tempera
ture where required, and also to provide doors
44 for inspection and other purposes. Where
the combustion gases in the burning section, and
discharging the air thus heated into a lower part
of said burning section, such air-conducting
burners or doors are placed, pipes 40 must be
The hot gases from the burning zone are passed
through a duct 45 to the heat exchanger 39 and
means including ducts with lateral outlets ar
ranged at the inner surface of the peripheral wall
and embedded at their lower ends in a hearth
below the compartment into which the air and
then through a fan 46 to the stack 41. ‘
vapors are discharged.
It will be understood that the furnace may
have any desired number of hearths in the fur
nace and in the drying and burning sections.
While applicable to the treatment of various
4. In apparatus of the class described, the com
bination with a multiple-hearth furnace having
a peripheral wall, vertically spaced hearths divid
ing the furnace into compartments and provided
with outlets through which material introduced
at the top of the furnace may pass from hearth
to hearth to the lowermost hearth and then be
discharged from the furnace, means at the out
let of one hearth for preventing the passage of
gases and dividing the furnace into an upper
drying section and a lower burning section, means 70
for supplying air to the drying section and means
for discharging hot combustion gases from the
higher part of the burning section, of means for
conducting air and vapor from the drying sec
omitted.
materials, the present invention is particularly
adapted for the disposal and destruction of waste
materials, such as garbage and sewage solids in
the form of sludge or in the form of screenings
having high moisture content.
It should be understood that various changes
may be made and that certain features may be
used without others without departing from the
true spirit and scope of the invention.
Having thus described my invention, I claim:
1. In apparatus of the class described, the com
75 bination with a multiple-hearth furnace having
charging hot combustion gases from the higher
part of the burning section, of means for con
ducting air and vapor from the drying section 50
tion downwardly in heat-exchanging relationship
2,124,122
3
with the combustion gases in the burning section,
and discharging the air thus heated into the
lower part of said burning section, such air
conducting means including ducts with lateral
nace may pass from hearth to hearth to the
lowermost hearth and then be discharged from
the furnace, means at the outlet of one hearth
inlets arranged at the inner surface of the pe
ripheral wall and embedded at their upper ends
in a hearth above the compartment from which
the air and vapors are received.
5. In apparatus of the class described, the com
bination with a multiple-hearth furnace having
the furnace into an upper drying section and a
for preventing the passage of gases and dividing
lower burning section, means for supplying air
to the drying section and means for discharging
hot combustion gases from the higher part of
the burning section, of means for conducting air
and vapor from the drying section downwardly in
heat-exchanging relationship with the combus
tion gases in the burning section and discharg
ing the air thus heated into the lower part of
said burning section and means for preheating
air for the drying section by means of the hot
waste gases from the burning section.
7. In apparatus of the class described, the com
bination with a multiple-hearth furnace having
a peripheral wall, vertically spaced hearths with
upper drying section and a lower burning sec
outlets through which material introduced at the 20
20 tion, means for supplying air to the drying sec
tion and means for discharging hot combustion , upper part of the furnace is passed downwardly
gases from the higher part of the burning section, from hearth to hearth and discharged from the
‘of means for conducting air and vapors from the lower part of the furnace, means at the outlet of
drying section downwardly in heat-exchanging one hearth for preventing the passage of gases
relationship with the combustion gases in the and dividing the furnace into an upper drying
burning section, and discharging the air thus section and a lower burning section, means for
heated into the lower part of said burning section, supplying heated gases to the drying section, and
such air conducting means including ducts with means for discharging hot combustion gases from‘
the burning section, of means for conducting
lateral inlets and outlets near their ends and
arranged at the inner surface of the peripheral gases and vapors from the drying section down
wardly at the interior surface of the peripheral
wall and embedded at their upper ends in a
hearth of the drying section and at their lower wall and in heat-exchanging relationship with
the hot combustion gases in the burning section,
ends in a hearth of the burning zone.
and discharging the gases and vapors thus heated
6. In apparatus of the class described, the com
bination with a multiple-hearth furnace having into the burning section.
WILLIAM RAISCH.
vertically spaced hearths with outlets, through
which material introduced at the top of the fur
a peripheral wall, vertically spaced hearths di
viding the furnace into compartments and pro
vided with outlets through which material intro
duced at the top of the furnace may pass from
hearth to hearth to the lowermost hearth and
then be discharged from the furnace, means at
the outlet of one hearth for preventing the pas
sage of gases and dividing the furnace into an
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