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Патент USA US2115337

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April 26, 1938.
G, R LEwERs
'
2,115,337
INCINERATION
Filed Dec. 4, 1936
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INVENTOR
GEO RGE R. LEWERS
' ,2”; ATTORNEY
Patented Apr. 26, 1938
2,115,337
UNITED STATES
PATENT OFFICE
2,115,337
INCINERATION
George R. Lewers, Brooklyn, N. Y., assignor, by
mesne assignments, to Underpinning & Foun
dation Company, Inc., New York, N. Y., a cor
poration of New York
Application December 4, 1936, Serial No. 114,124
9 Claims.
This invention relates to incineration and more
particularly to improvements in tiered multiple
hearth furnaces and to improvements in process
es for drying and burning material bypassing it
of: -? downwardly through a plurality of zones, gradu
ally drying it in upper zones and then burning it
in lower zones.
.
Although the apparatus and process of the
‘ _ present invention are suitable for use with many
it) kinds of material, they are of particular value in
drying and burning waste material such as gar
bage and sewage material including sewage
sludge and sewage screenings bothof which have
‘
a substantial moisture content.
The principal objects of the invention are to
as a heat exchanger and the air passing there
through is heated, to some extent before being
discharged into the furnace. The present inven
tion contemplates a greater heating of the air 5
before it is discharged into the furnace. In car
rying out this feature of the invention, direct
?ow of air through the hollow shaft may be shut
off by a suitable obstruction and the air may be
by-passed around the obstruction through a suit- 10:"
able heat exchanger carried by the shaft. The
heat exchanger may consist of an inlet chamber
or duct surrounding the shaft and communicat
ing with the interior of the shaft below the ob
struction, a discharge chamber or duct surround- 1B3
ing the shaft and communicating with the inte
ratus and processes for treatment of material of
rior of the shaft above the obstruction, and a
plurality of ducts or tubes- parallel to the shaft
and connecting the inlet and discharge chambers.
the general character speci?ed. Another object
treatment is passed downwardly through a plu
rality of drying zones and then through a plu
rality of burning zones. A further object relates
' to improvements in the heating within a multi
Other objects, features and advantages will ap
pear upon consideration of the following detailed
description and of the drawing in which the
?gure is a view in vertical'section of apparatus
embodying a preferred form of the invention.
be embodied in a furnace I0 provided with a top
The invention may be carried out in connec
tion with a multiple-hearth furnace divided into
the hearth ll serves as a bottom of the furnace or
an upper drying section and a lower burning sec
tion by an intermediate hearth having a gas seal
through which the solids are fed in correspond
rabbling devices supported and operated by a hol
55 low vertical shaft. A current of heated air may
be passed through the drying zones in contact
with the material on the various hearths and
then laden with vapors of moisture and volatile
substances may be discharged therefrom. Ordi
iill' narily the air thus laden with vapors would be
passed, either with or without reheating, into the
burning section of the furnace. According to the
present invention, however, vapors mixed with
l the air are condensed and removed before the air
45" is introduced into the burning section.
_
‘ The air to be introduced into the drying sec
tion of the furnace may be supplied through a
hollow vertical shaft used in operating rabbling
devices whereby the solid material on the vari
ous hearths is agitated and fed to the outlets
thereof for passage downwardly through the fur
nace. Heretofore air supplied to the lower end
of a shaft of this kind has been conducted direct
ly through the hollow shaft to a desired point and
55 then discharged through an outlet or nozzle into
20
Referring to the drawing, the invention may 2'5"
ple-hearth furnace of air supplied to the furnace.
ence with the downward discharge through the
other hearths due, for example, to the action of
’
a compartment of the furnace. The shaft serves
provide novel and advantageous forms of appa
relates to the condensation and removal of vapors
from the gases passing from the drying zones to
the burning zones where the material under
P10 ‘;
(Cl. 110-12)
H and hearths I2, [3, l4, l5, I6 and ll, of which
furnace chamber.
The material to be treated may be introduced 30'?
into the furnace and deposited ‘upon the upper
most hearth l2 through a hopper l8 and a chute
l9 extending through the top H of the furnace
and provided with a pivoted door or gate 20 nor
mally held closed by suitable means such as a 357‘
weighted arm 2|. As soon as a sufficient amount
of material to overcome the action of the
weighted arm 2| collects on the door or gate 28,
the door swings downwardly about its pivotal
support and permits the material on the door to 40‘
fall to the hearth l2.
7
As illustrated, this material falls on the hearth
[2 near its periphery and is worked inwardly. to a
central discharge opening 22 by suitable rabbling 45
means including one or more radial arms 23 and
inclined blades 24 carried thereby. Below the
hearth l2,'the hearths l3 and 15 are provided
with peripheral outlets 25, the hearths l4 and
it are providedrwith central outlets 22 corre
sponding with the central outlet of the hearth
l2, and the lower hearth I‘! is provided with a
single outlet or chute 26 through which the ash
is discharged from the furnace. The chute 25
is preferably provided with a gas seal in theform 55
.7217
7 2,115,337
. of a pivoted door 21 normally ‘held in closed po
sition by a weighted arm 28.
The material on' the hearths'rl3, |4, |5, l6 and‘
' I1 is moved towards the corresponding outlets by
suitable rabbling means similar to that used
above the hearth |2, the blades 28 above the
modate a heat ‘exchanger of desired capacity. It
mayrtherefore be convenient to utilize two com- I
partments of the burning section by arranging
forthe heat exchange to pass through the cen- .
tral outlet of a hearth having this type of outlet. 7
As herein, disclosed, the heat exchanger 42 ex-,
hearths l3, I5 and I‘! being so inclined as to carry tends through the hearth I4 of which the central
the material outwardly to thel'peripheral outlets ‘ outlet is madelarger for this purpose. The re-'
quirement for space may also be met by spacing
thereof,'a_nd the blades aboverthe hearths I4 and
_ certain hearths farther apart, thus providing lot
10 H5 being so inclined as to work the material to ' higher compartments. As shown on the drawing,
'ward the central opening as in the case of hearth
. the compartment above the hearth I5 is of great
12.
'
a
i
'
.
'
'
'
,
~
'
,
The rabbling arms 23 ‘may be supported and er height'than the other compartments.
The air supplied to-the uppermostcompart
operated» by a hollow vertical shaft 29 passing
15.
15 through the central parts 'of'the central outlets ‘ment orzone of the‘ drying section may be passed
22' of the hearths |2, |4 andfl? and through small downwardly through the section, that isconcur
openings in the top | | and the hearths |3, J5 and rently with the flow of the solids, anddischarged '
a‘ IT,’ suitable gas seals being. provided Where the from thelowermost'drying compartment through ' '
' shaft 29 passes through the top, and these; a duct 41 to a condenser 48. . This condenser may
The shaft 29 may be rotated inany
7207 hearths.
suitable manner as by'meansof a'bevel gear 30
' thereon, abevel gear 3| ,meshingwith the. bevel
comprise a chamber 49 with a drainage sump at
,its bottom discharging through'a drain or drain
pipe 50, and arpipe system; or coil 5| in the cham
gear 30, and'a' pulley 32 connected with the bevel ber connected at one end with ,a supply pipe 52 r‘
gear 3| and driven‘ from any’ suitable source of . and discharging; at the other end'into thesump
at the "bottom of the chamber 49, the condensate 25
The furnace may be divided intoj‘an' upper or and condenser water ?owing away together
drying'section and alower burning section by the ' through the drain 50.‘ The liquid discharged: '
25
power.
»
hearth I3 which‘preferably'has but one outlet
through the drain 50 may be carried away with ‘
25 ‘provided with a’ valvev or , gas seal through
the ‘sewage ?ltrate resulting from a preliminary '30
which thefsolid material may be fed while an
dewatering of the sewage sludge, or may be re
effective gas seal is maintained.~ Although this turned to. the sewage stream before it reaches’
valve may take different forms, thatzdisclosedp ‘the ?lter. In this connection attention may be
comprises a’ tube343i in said outlet ‘25, a conical called to the high moisture content of the sewage
" valve for valve member 34 adapted. to. cooperate‘ ' sludge fedto the furnace and the resulting large
with the lowerendfof the tube “and urged‘to,
"closing position j by,’ suitable , means which 1 may
comprise a lever 35 pivoted at 36 and having a
pivotal connection with the valve member .34.
7 volume of water vapor?owing out of the drying .
section with the air stream. Obviously there will
be a. large amount of liquid‘ condensedrin the.
condenser.
I
"
.
'
The lever 35' passes through the side "of the tube
,133 and through the wall of the furnace,.the outer
From- the condenser, the/relatively dry’ air is
‘passed through a duct. 53jto the burning section, 40
“ arm being urged downwardly byv a weight 31.
vpreferably
into
the V lowermost, compartment
Division of the furnace in this way renders pos
sible better control of the ?ow of airrandigases.
The air and hot combustion gases ?ow up
through the various parts of the furnace.
,
wardly through the burning section and'are dis
Air may be supplied to the drying section 7 charged therefrom, preferably from the upper-'
I; through the hollow shaft 29, to the lower part of most compartment, through‘ a duct 54, which
which air may be supplied by a fan 38 and con
may lead through a suction fan to a stack.
'
' ,necting duct 39. _The air passing upthrough the
Obviously the number of'hearths' in thedrying , V
furnace in the hollow shaft. will be heated by; and burning‘sections may be varied. For use in
thereof.
_
l
V
,
heat exchange with the contents of the burning , starting and whenever‘needed, the gvariousrcom
zones and in this preheated condition may be partments or zones may be provided with'burners
discharged into theupper partlof the drying sec-j '54 and doors 55."
"
'
"
‘ '
' tion through oneor more outlets or nozzles 40.
7
It should be understood that various changes’
,Heretofore, the air has been passed through the 'vmay be'made and that certain features may be
hollow shaft from an inlet to an outlet.
. '55;
- In the present instance, itfis desired to utilize
the heat from the burninglmate'rial in the burn-,
- ing zones
to raise the temperature to’ahigher V .
level. . To thisendLdir'ect flow of the air through
" gm.
used without others without" departing'from the
true scope and spirit of the invention. 5
the, hollow shaft may be prevented by. providing
, the'hollow shaft at 'a suitable point withian ob
struction or dam 4| to shut off the flow and divert
the stream through 'a heat‘ exchanger 42 carried
Having thus/described my invention,‘I claim:
_
-,1. In combination mm a tiered multiple
hearth? furnace divided into adryi'ng section and
a burning sectio-nby a hearth having a gas sear '
through which solid material may be fed, means.
for supplying airfto the‘ drying section, and means , 5
by the shaft; This heat exchanger may be of the “for discharging hot combustion gases’from'v the l‘
duct or pipe type andcomprise a lower hollow btu'ning section, a condenser and means for with
ring 43 communicating with‘ the interior of the ' drawingairladen with vapors fromlthe drying
shaft’ 29 below thedam-M through'one or'more' section and passing it through said condenser to
the burning section. '
'
‘r
connections 44, an upper hollow ring 45 com
municating with the interior of the shaft;29 ' 2. In combination with a 1 tiered multiple
hearth furnace divided into a drying section and
abovethe dam 4| through one or more connec
tions 46.* Hot gases, of combustion, mayv engage , a burning section by a hearth having a gas seal"
the ducts-of the heat exchanger 42 at vall sides through which solid ‘material may be fed, means
70-"
and provide effective heat“ exchange.
7 j p. The usual compartment over. a burninghearth
‘I 15": would
for supplying air to upperrpart of the drying sec- . f
tion, and means for discharging hot combustion"
not ordinarily’be high enough to aecom- ' gases from the burning section, a condenser and u
2,115,337
3
means for withdrawing air laden with vapors
from the lower part of the drying section' and pass
ing it through said condenser to the burning sec
shaft and by-passing air around the blocking
tion.
3. In combination with a tiered multiple
hearth furnace divided into a drying section and
hearth furnace comprising upper dryingcom
partments' and lower burning compartments, and 5
a burning section by a hearth having a gas seal
through which solid material may be fed, means
for supplying air to the drying section, and means
10 for discharging hot combustion gases from the
upper part of the burning section, a condenser
and means for withdrawing air laden with vapors
from the drying section and passing it through
said condenser to the lower part of the burn
15 ing section.
4. In combination with a tiered multiple
hearth furnace divided into a drying section and
a burning section by a hearth having a gas seal
through which solid material may be fed, means
20 for supplying air to the drying section, and. means
for discharging hot combustion gases from the
burning section, a condenser and means for with
drawing air laden with vapors from the drying
section and passing it through said condenser to
26 the burning section, said condenser comprising
a chamber through which the air passes, said
chamber having a drainage outlet for condensed ‘
moisture, and a water duct passing through said
chamber to condense moisture carried by the air
30 and discharging through said drainage outlet with
said condensed moisture.
5. In combination with a ‘ tiered multiple
hearth furnace comprising upper drying compart
ments and lower burning compartments, and a
35 hollow shaft supplied with air at its lower part
and discharging air into a drying compartment,
means for blocking the passage of air through a
part of said shaft in the burning zones and a
heat exchanger surrounding said shaft and by
passing air around the blocking means.
6. In combination with a tiered multiple
hearth furnace comprising upper drying compart
ments and lower burning compartments, and a
hollow shaft supplied with air at its lower part
45 and discharging air into a drying compartment,
means for blocking the passage of air through a
part of said shaft in the burning zones and a
multiple duct heat exchanger surrounding said
means.
.
.
7. In combination with a tiered multiple
a hollow shaft supplied with air at its lower part
and discharging air into a drying compartment,
means for blocking the passage of air through a
part of said shaft in the burning zones and a heat’
exchanger surroundingsaid shaft and ‘by-passing 10
air around the blocking means, said heat ex
changer comprising a duct surrounding said shaft
and communicating with its interior below the
blocking means, a second duct surrounding said
shaft and communicating with its interior above
the blocking means and a plurality of ducts con
necting the ?rst and second mentioned ducts.
8. In combination with a tiered multiple
hearth furnace comprising upper drying compart
ments and lower burning compartments, and a 20
hollow shaft supplied with air at its lower part
and discharging air into a drying compartment,
means for blocking the passage of air through a
part of said shaft in the burning zones and a
heat exchanger surrounding said shaft and by 25
passing air around the blocking means, said heat
exchanger comprising a duct surrounding said
shaft but spaced therefrom and communicating
with its interior below the blocking means, a
second duct surrounding said shaft but spaced 30
therefrom and communicating with its interior
above the blocking means and a plurality of ducts
connecting the ?rst and second mentioned ducts.
9. In combination vwith a tiered multiple
hearth furnace in which the hearths are provided 35
alternately with central and peripheral outlets for
downward passage of the solids under treatment,
and a central hollow shaft receiving air at its
lower part and discharging it into the furnace
above an upper hearth, said shaft passing through 40
the central parts of the central outlets of alter
nate hearths and with gas-seal connections
through the other hearths, a heat exchanger sur
rounding said shaft and extending through one of
said central outlets, and means for passing 45
through the heat exchanger air supplied through
said hollow shaft.
GEORGE R. LEW'ERS.
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