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Патент USA US2110309

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March 8, 1938.
w. RAISCH ‘
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2,110,309
INCINERATION
'
Filed‘ Nov. 12’, 1936
/2
‘
INVENTOR
WILLIAM
RAISCH
BY fmg ?
ATTORNEY
Patented Mar. s, 1938
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2,1103%
UNl'i'D STATES
TE'FOFHQE
2,110,309 -
momsaa'riou
William Raisch, New York, N. Y., assignor to
Underpinning 85 Foundation 60., End, New
York, N. ‘2., a corporation of New York
Application November 12, 1936, Serial No. 110,419'
9 Claims.
(oi; 110-42)
This invention relates to incineration and more
ly: around the edge of the partition ‘and then
particularly to improvements in tiered multiplehearth furnaces and to improvements in proc-
outwardly to ducts at the peripheral wall through
which it flows upwardly to the nexthollow
esses for drying and burning material of a high
5 moisture or volatile content by passing it downWardly through a plurality of zones, gradually
drying it in upper zones and ?nally burning it
in lower zones.
Although the apparatus and method of the
10 present invention are applicable to the treatment
of many kinds of material, they are of particular
hearth or tothe hollow top of the furnace. The
heat transfer to the interior of the drying sec-- 5
tion is obviously very complete and it may not be
necessary to preheat the air before its passage
into the drying section.
2
In the drawing, Figure 1 is a view in vertical
section of the apparatus of the present invention. 10
Figure 2 is a fragmentary section on line 2_-2
value in drying and burning waste material such
of Figure l.
age sludge and sewage screenings both of which
of Figure l.
provide novel, advantageous and eiiective forms
of apparatus and processes adapted for treatment
of materials of the general character speci?ed.
ing a multiple-hearth furnace Hl having a pe
ripheral wall I l , a hollow top I2 and hearths I3,
l5, Hi,‘ will, '3 and 59 Of which the hearth ‘9
as garbage and sewage materials including sew-
15 have a substantial moisture content.
' The principal objects of the invention are to
,
.
Figure 3 Be fragmentary section on line 3-—3
Referring to‘ the drawing in which there is 15.
illustrated a preferred form of apparatus includ
20 Another object relates to improved means for
forms the bottom of the furnace.
heating the interior of the drying section by use
of the gases of combustion from the burning
section. Another object of the invention relates
to improved hearth construction for the drying
25 section to enable better heat exchange between
the waste gases of combustion and the air and
vapors in the drying section. A further object
relates to improved heat exchange means whereby heat from the combustion gases is supplied
30 to the interior of the drying section from the top
and sides of the section but also from the upper
and lower surfaces, of the'hearth.
In carrying out the invention, use may be made
permit the downward‘movemeht 0f the material.
from hearth to. hearth the uppermost hearth l3
is provided‘ with one or more peripheral outlets
26, the hearth M is provided with a central out
let 2i, the hearth i5 is provided with a peripheral 25}
outlet-22 equipped with a feeding device 23 for
feeding the material from the compartment
above. the hearth 22 to the compartment below
the hearth 22 which prevents the passage of gas
between the two compartments, the hearth I6 is 301
provided with a central opening 2!, the hearth I1‘
is provided with one or more peripheral openings
29, the hearth is is provided with a central open
of a multiple-hearth furnace divided into an up35per drying section and a lower burning sec-
ing 2i andthe hearth 19 or bottom of the fur
nace is provided with an outlet or chute 26 nor- 35.
really closed by a door or gate 25 urged to clos
tion by a hearth provided with a device which
feeds material from the compartment above the
dividing hearth to the next lower compartment
without permitting the flow of gas therethrough.
40 .Air is supplied to the upper part of the drying
section and passed downwardly therethrough and
then is passed from the bottom of the drying
zone to the lower part of the burning section.
The furnace may also have a hollow top through
45 which the hot gases pass before ?nal discharge
from the furnace. An. important feature of the
present invention relates to the passage of the
hot gases from the burning section through one
or more hollow hearths of the drying section
50 and through a series of peripherally arranged
ducts to upper hollow hearths or to the hollow
top of the furnace, each hollow hearth being
so divided by a substantially horizontal partition so that the gases will flow toward the center
55 _ along the lower side or the hearth, then upward-
In order to 20:
ing position by weighted arm 26. Suitable gas
seals around the shaft 3!], are provided at the
top l2 and the hearths l3, l5, I1 and I9. At the
top of the furnace, material is introduced into 40
the uppermost compartment through a hopper
21, a chute 280!» passing through the hollow top 12
and provided with a pivoted gate 28 normally
held in closed position by a weighted arm 29.
Positioned substantially axially with reference ' 45‘
to the furnace is a hollow shaft 30 carrying rab
bling devices which extend over the upper sur
faces of said hearths, each of these rabbling de
ices constituting an arm 3i and blades 32 so
inclined with the rabbling devices over the 50
hearths l3, l5, ll! and #9 so as to Work the mate
rial, outwardly ‘on these hearths, and so inclined
above the hcarths ill, 58 and l8 as to work the
material toward the central openings 2|. The
shait;3l3 may be operated inv any suitable manner 55 -
2
2,110,309
as by means of a bevel gear 33 thereon, a bevel
gear 34 meshing with the bevel gear 33 and a
pulley 35 connectedwith the bevel gear 34 and
operated from any suitable source of power.
The feeding device or valve 23 at the hearth‘
I I5 may be of any suitable kind, but is here shown
as made up of two feed screws, one of which, 36,
feeds the material outwardly and the other of
and a lower burning section, means for supplying
air to the drying section, means for passing air
and vapor from the drying section to the burning
section and means for discharging hot combus
tion gases from the burning section, means for
heating the interior of the drying section by
means of said hot combustion gases comprising a
which, 31, receives the material from the screw hollow hearth and a partition therein dividing
T10 '36 and works it inwardly to discharge'it into the ‘ the hearth into a lower compartment, receiving
compartment below the hearth IS.
The screws - the hot combustion gases and an upper compart
376 and 31'may be mounted on shafts 38 and 39
respectively and connected for driving in opposite
‘directions by means of intermeshing gearsv 40
15
and 4|.
.
Air is introduced into the upper part of the
10
ment communicating with the lower compart
ment near the center of the hearth and receiv
ing the hot gases from the lower compartment,
and means for discharging the hot combustion
gases from said upper compartment.
15
2. In a tiered multiple-hearth'furnace includ-'
a peripheral wall, an intermediate hearth
downwardly through the drying section, and then,‘ _' ing
with a gas seal separating the furnace into an
laden with vapors of moisture and volatile ma
upper drying section and a lower burning section,
20 terials, is passed through a duct 43 to the lower
part ,ofjthe' burning section, preferably to the means for supplying air to the drying section, 20
means for passing air and vapors from the drying
. lowermost compartments of the burning section.
From the upper part of the burning zone, the section to the burning section and means for dis
hot gases of combustion are passed through a charging hot combustion gases from the burning
section, means for heating the interior of the
25 duct 44 to the lowermost hollow hearth l4 of the
drying section by means of said hot combustion 25
' drying section, then through the upper hearth l3
gases comprising a hollow furnace top, a hollow
' andto the hollow top from which they are dis
uppermost hearth and a‘ partition therein divid
charged through a duct 45.
.
- .
ing the hearth into a lower compartment receiv
' Except for the positions of the outlets, the
30:: -hearths I3. and I4 are very similar. The hearth ing the hot combustion gases and an upper com
I4 is hollow and midway between its upper and’ partment communicating‘ with the lower com 30
partment near the center of the hearth and re
'lowerwalls is provided with an annular ‘parti
tion’ 46 extending from the outside peripheral ceiving the hot gases from the lower compart
wall 'of the hollow hearth to a position somewhat ment, means for conducting the hot combustion
gases from said upper compartment upwardly
35‘ short. of the chamber wall around the shaft 30
along the inner surface of said peripheral wall
so that hot gases introduced into the hearth be ‘ in
heat exchange
drying section by means of a duct 42 and passes
lowthe partition 46 will ?ow'inwardly along the
bottom of the hearth, upwardlyv at the center of
the ‘hearth and then outwardly beneath the top
wall,of the hearth. Proper spacing between the
relationship with the interior
of the furnace and discharging the same into said
hollow top, and means for discharging the com
bustion gases from said hollow top.
3. In a tiered multiple-hearth furnace in 4,0
bottom wall of the hearth l4 and the partition 46
may‘ be obtained by use of
’ suitable spacing de-. cluding a peripheral wall, an intermediate hearth
vices 41. Adjacent to the interior surface of the , with a gas seal separating‘ the furnace into an
peripheral wall ll of the furnace, the upper ' upper drying section and alower burning section,
means for supplying air to the drying section,
means for passing air and vapor from the drying‘ 45
around a considerable portion‘of the periphery section vto ,the burning section and means for
of the drying chamber which ducts communicate discharging hot combustion gases from the bum
with alower compartment in hearth l 4'separated ing section, means for heating the interior of the
from the upper compartment therein by means of ' drying section by means of said hot combustion
a central partition 49 supportedrfrom the lower gases comprising a hollow furnace top, a hollow 50
wall of the hearth by means of suitable spacing uppermost hearth andra partition therein divid
devices 50. In this hearth as in the hearth I4 ing the hearth into a lower compartment receiv
the hot gases of combustion are passed inwardly ing the hot combustion gases and‘ an upper com
557 around the inner edge of the partition and then
partment communicating with the lower com
.chamber'of the hearth I4 is connected with a
plurality of ducts 48 extending upwardly and
pass upwardly through a series of ducts 5| to
~ the hollow top I2 of the furnace.
partment near the center of the hearth and re
ceiving the hot gases from the lower compart
55
In order to aid in starting the furnace and to - ment, ducts arranged around the inner surface of
assure the proper temperature the furnace may the peripheral wall for conducting the hot com
60 be provided at suitable points ’,with burners 52.
bustion gases from said upper compartment up
. Access to the different compartments may be had wardly along the inner surface of said peripheral 60
through doors 53.
wall in heat exchange relationship with the inte
Obviously the heat in the hot combustion gases rior of the furnace and discharging the same into
is used very effectively in heating‘ the interior‘of said hollow top, and means for discharging the
‘
thedrying section and the air therein. It may combustion gases from said hollow top.
therefore be unnecessary to preheat the air sup
plied to the drying section.
It should be vunderstood that various changes
may be made and that various features may be
' 70"
used without others without departing from the
vtrue spirit and scope of the invention.
Having thus described my invention, I claim:
1. In a tiered multiple-hearth furnace includ-'
ing an intermediate hearth with a gas seal sepa
a 15:
rating the furnace into an upper drying section
4. In a tiered multiple-hearth'furnace includ
ing an intermediate hearth with a gas seal sepa
65
rating the furnace into an upper drying section
and a lower burning section, means for supply
ing air to the drying‘ section, means for passing
air and vapor from the drying section to the
burning section and means for discharging hot 70
combustion gases from the burning section,
means for heating the interior of the drying
section by means of said hot combustion gases
comprising a hollow'hearth and an annular par
75
3
2,110,309
tition therein dividing the hearth into a lower
compartment receiving the hot combustion gases
and. an upper compartment communicating with
the lower compartment near the center of the
hearth around the inner edge of said annular
partition and receiving the hot gases from the
lower compartment, and means for discharging
the hot combustion gases from said upper com
partment.
10
5. In a tiered multipleehearth furnace includ
ing a peripheral wall, an intermediate hearth
with a gas seal separating the furnace into an
upper drying section and a lower burning sec~
tion, means for supplying air to the drying sec
15 tion, means for passing air and vapor from the
drying section, means for passing air and vapor
from the drying section to the burning section
and means for discharging hot combustion gases
from the burning section, means for heating the
20 interior of the drying section by means of said
hot combustion gases comprising a plurality of
hollow hearths, a partition in each hearth divid
ing the hearth into a lower compartment receiv
ing the hot combustion gases and an upper com
25 partment communicating with the lower com
partment near the center of the hearth and
receiving the hot gases from the lower compart
ment, means for conducting gases from the upper
compartment of a lower hollow hearth to the
30 lower compartment of the next higher hollow
hearth, and means for discharging the hot com
bustion gases from the upper compartment of the
uppermost hollow hearth.
6. In a tiered multiple-hearth furnace includ
ing an intermediate hearth with a gas seal sepa
35 rating the furnace into an upper drying section
and a lower burning section, means for supply
ing air to the drying section, means for passing
air and vapor from the drying section to the
burning section and means for discharging hot
4.0 combustion gases from the burning section, means
for heating the interior of the drying section by
means of said hot combustion gases comprising
downwardly through the zones of the drying
group along the path of travel of the material,
discharging air and vapor from the lower part
of the drying group and introducing them into
the lowermost burning zone, passing the gaseous
products of combustion from one of the burning
zones over one of the drying zones in heat ex
changing relationship with the air and vapors
therein but separated therefrom and then be
neath the next higher drying zone in heat ex 10
changing relationship therewith, and discharging
the hot combustion gases from the drying zones.
8. The method which comprises passing mate
rial of high moisture content downwardly through
a plurality of zones while ?rst drying and then 15
burning the same, temporarily retaining said ma
terial in each of a plurality of said zones, moving
said material substantially horizontally through
each of said zones by the application of a series
of rabbling impulses thereto, preventing the di 20
rect passage of gases between two adjacent zones,
thereby separating the zones into a drying group
and a burning group, passing a stream of air
downwardly through the zones of the drying
group along the path of travel of the material, 25
discharging air and vapor from the lower part
of the drying group and introducing them into
the lowermost burning zone, passing the gaseous
products of combustion from one of the burning
zones over one of the drying zones in heat ex~ 30
changing relationship with the air and vapors
therein but separated therefrom and then be
neath the next higher drying zone in heat ex
changing relationship therewith, and ?nally pass
ing the hot gases over the uppermost drying zone
and discharging them from the drying zones.
9. The method which comprises passing mate
rial of high moisturecontent downwardly through
a plurality of zones while ?rst drying and then
burning the same, temporarily retaining said ma 40
terial in each of a plurality of said zones, moving
said material substantially horizontally through
each of said zones by the application of a series
of rabbling impulses thereto, preventing the di
an annular hollow hearth and an annular parti - rect passage of gases between two adjacent zones
tion therein dividing the hearth into a lower
45 compartment receiving the hot combustion gases thereby separating the zones into a drying group
and a burning group, passing a stream of air
and an upper compartment communicating with
the lower compartment near the inner edge of
the hearth and receiving the hot gases from the
lower compartment, and means for discharging
50 the hot combustion gases from said upper com
partment.
'7. The method which comprises passing mate
rial of high, moisture content downwardly through
a plurality of zones while ?rst drying and then
55 burning the same, temporarily retaining said ma
terial in each of a plurality of said zones, moving
said material substantially horizontally through
each of said zones by the application of a series
of rabbling impulses thereto, preventing the di
rect passage of gases between two adjacent zones,
thereby separating the zones into a drying group
and a burning group, passing a stream of air
downwardly through the zones of the drying
group along the path of travel of the material
discharging air and vapor from the lower part
of the drying group and introducing them into
the lowermost burning zone, passing the gaseous
products of combustion from one of the burning
zones over one of the drying zones in heat ex
changing relationship with the air and vapors 55
therein but separated therefrom and then beneath
the next higher burning zone in heat exchanging
relationship therewith, passing the hot gases up
wardly around said next higher drying zone and
then over the same in heat exchanging relation
ship therewith, and ?nally discharging said hot
gases,
RAISCH.
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