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Патент USA US3046923

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July 31, 1962
w. LUDIN
FURNACE FOR THE COMBUSTION OF‘ DOMESTIC
REFUSE AND OTHER INFERIOR-GRADE FUELS
3,046,915
Filed April 1, 1953
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IN Mm ~.K.
Wile/YER Jl/D/IV
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3,?46,§15
Patented July 31, 1962
2
and 4b. From the pro-drying grate 3 the refuse passes
3,046,915
FURNACE FUR THE CUMBUSTION 0F DOME§= I
TTC REFUSE ANT) OTHER
FUELS
MGR-GRADE
Werner Ludin, Zurich, Switzerland, assignor to L. von
Roll, AG, Zurich, Switzerland, a company of Switzer
land
Filed Apr. 1, 1953, Ser. No. 346,213
Claims priority, application Switzerland Apr. 26, 1952
1 Claim. (Ci. 11tl—15)
into the combustion chamber 3a and on to the combustion
grate 5 and thence into the gas generator shaft 7. On the
foraminous pro-drying grate 3, preliminary drying takes >
place, partly under the in?uence of the hot gases sweep
ing over the surface and partly by the radiation emanat
ing from the brickwork and the hot gases. If these
measures ‘are not sufficient, it is possible to insuf?ate hot
gases below the pre-drying grates, these gases being
10 drawn, for example, from the space above the forami
nous combustion grate 5 and from the space above the gas
The present invention relates to a novel furnace for the
generator shaft 7 through a tube 4 into the injector pump
‘is as shown in FIG. 2. These gases are then introduced
fuels.
through tube 4d into the space below the pre-drying grate
t is common knowledge that the complete combustion
of domestic refuse and of other inferior-grade fuels is 15 3, the arrows indicating the direction of travel of the
gases. Another possibility is to blow clean air below
dif?cult. The reason for this resides partly in the high
the pre-drying grates through tube 4b in order to pro
moisture and/ or ash content, and partly in the heterogene
duce lively combustion there also. The refuse, part of it
ous composition of the fuel. This latter feature is partic
already in a state of combustion, now falls on to the
ularly vcharacteristic of domestic refuse. The calori?c
value of the latter depends partly on the content of read 20 principal grate 5. Here the readily combustible compo—
nents burn under the in?uence of the cold or preheated air
ily combustible substances such as paper, cardboard,
injected into the zones 6 located below the grate. At
straw, etc., and partly on the content of heating furnace
the end of the principal grate, all that remains are the
residues, such as coke, coal, etc., which, as experience
clinker and the particles of coke and coal originating
shows, burn much more slowly than the former.
If incineration is used not only for the purpose of dis— 25 from the heating furnace residues. The gasi?cation or
combustion ‘of these particles takes place in the adjoining
posing of the refuse in a hygienic manner, but also for
shaft 7 under the in?uence of the stream of air or steam
the purpose of utilizing the heat latent therein, the most
or other oxygen-containing gas injected through the noz
complete possible combustion of all components must be
zles 8. The gas generator shaft 7 is, according to the in
aimed at. Therefore, any furnace or incinerator which is
to satisfy these requirements must be provided with ele 30 vention, designed as a vertical discharge shaft and its con
combustion of domestic refuse and other inferior-grade
ments adapted to pre-dry the freshly charged refuse, burn
tents 9 rest on a scraper chain 10 conducted across the
the readily combustible components thereof, and, ?nally,
bottom of the shaft.
burn or gasify the components of dif?cult cornbusition.
side wall 11a of the lower portion of the shaft 7 is in
clined in diverging relationship, preferably the rear wall
Construction of furnaces are known in which the pre
As shown in FIG. 3, at'least one
drying of the freshly charged refuse and the combustion 35 of the discharge shaft 7 as viewed in the direction of
of the readily combustible components thereof are per
formed on a mechanical feed grate and the combustion
and/ or gasi?cation of the components of difficult com
busition in a generator. Whilst the mere combination
travel of the chain 10. The inclination of the walls 11
at the ‘outlet of the clinker generator is preferably such
of di?icult combustion and which automatically discharges
The bottom portion of the trough 12 is disposed below the
shaft 7 while the side portions of said trough extend above
the lower end of the shaft, i.e., the shaft dips into the
that on the one hand an even subsidence of the contents
of the shaft under the in?uence of the movement of the
of these elements is a source of various di?iculties, the 40 chain is ensured and on the other hand the drag on the
chain is as small as possible. The Wall may be made ad
generators and the automatic clinker removal systems so
justable as to inclination. In this way the congestion
far designed are particularly unsatisfactory and do not
free removal of the clinker from the shaft 7 by the chain
ensure continuous, automatic operation of the furnace.
10 is ensured. The scraper chain 10 is designed as an
It is, therefore, an object ‘of the present invention to
provide a furnace for burning domestic refuse and other 45 endless band. The lower part of the generator 7 ex
tends into a trough, bath or channel 12 ?lled with water.
inferior-grade fuels which fully utilizes the components
thedgms of clinker.
The furnace is characterized by the fact that the gas
generator takes the form of a vertical shaft and is con
50 water contained in the trough so that the clinker form
nected directly to the combustion grate, and that below
ing is immediately quenched for disintegration thereof.
the gas generator shaft a scraper chain is disposed on
which the contents of the generator rest and which con
tinuously removes the clinker.
The chain 10 is introduced into the channel 12 via suit
able mountings 13 and 14. The trough 12 has a bottom
FIG. 1 is a vertical section through a furnace in accord
ance with the present invention with parts thereof shown
‘channel 12 is a rising gradient or ramp 15 on which the
portion spaced from the lower end of the shaft 7, and
The accompanying drawing shows several embodiments 55 has side walls or portions 12a which extend above the
lower end of the shaft. Disposed contiguously to the
of furnace according to the invention, wherein:
chain lies and is suitably guided. The gradient or ramp
15 leads to a discharging station 16 through which the
60 clinker is discharged into tipping wagons 17 which can
FIG. 2 is a vertical section of a portion of a modi?ed
be wheeled into position thereunder. The chain 10 is
furnace schematically showing pre-heating tube means;
then guided back below the shaft 7 via suitable mountings
and
schematically;
FIG. 3 is a vertical section of a portion of a modi?ed
furnace schematically showing a gas generator shaft with 65
an adjustable inclined wall.
_
18, 19 and 20.
'
What is claimed is:
A furnace for continuously and automatically burning
a charge of refuse and low-grade fuel material for ob
In FIG. 1, the numeral 1 designates the charging hop
taining gaseous products; comprising a pair of substan
per, which is supplied with fresh refuse. The vertical
tially parallel vertical walls de?ning a combustion cham
shaft 2, which is contiguous to the hop, er and provides
ber in part, which is substantially of greater height than
an airtight seal for the combustion chamber or furnace 70 width, a hopper for delivering said charge into said com
3a, leads the refuse on to the pro-drying grates 3. The
bustion chamber and located at the upper end of the lat
combustion chamber has substantially vertical walls 4a
ter, one of said vertical walls forming a part of said hop—
3,046,915
--
per, an exhaust ?ue located at the upper end of the other
4
leased from said vertical discharge shaft being guided
past said second grate and along said passageway into
of said vertical walls and extending in a direction ‘away
from said hopper, a ?rst foraminous grate below said
said exhaust ?ue and deviated from said ?rst grate and '
hopper and mounted at one of its ends on said one verti
said hopper, and respective means located below said
cal wall and extending therefrom at an angle and in down
'?rst and second grates for supplying air to the ‘same fromv
ward direction into said chamber, said ?rst grate ‘termi
nat-ing with its opposite end spaced from the other verti
therebelow, said trough means extending below said'p'air
of vertical walls, said hopper, said ?rst grate and said
cal wall, a second foraminous grate mounted within said
combustion‘ chamber and spaced from and below said
" discharge shaft being disposed in spaced relation to each
other at said one vertical wall.
?rst grate, said second grate being mounted at one end on
the other vertical wall and extendingtherefrom at an angle
' and in downward direction, the opposite end of said?sec
References Qited in the ?le of this patent
UNITED STATES PATENTS
'ond grate ‘being spaced from said one vertical wall to
thereby de?ne between the opposite ends of said grates a
passageway for gaseous products escaping to said exhaust 15
, ?ue, an upright discharge shaft forming a gas generator
812,380
Suzuki ______________ __ Feb. 13, 1906
1,049,561
1,363,116
Bradley ______________ __ Ian. 7,1913
Heller et al ___________ __ Dec.’ 21, 1920
and ‘located between and within the con?nes of said verti
1,375,679
Danner _______ _'_2 ____ __ Apr. 26, 1921
cal walls atthe lower‘ends thereof, said discharge shaft
1,523,860
_Coghian et al. ____ _;____ IanJZG, 1925
1,583,436
1,659,564
1,772,285
1,914,746
Atkinson ____________ __ May 4, 1926
Duncan _______ -2 _____ __ Feb. 21, 19:28
Knitteltna __________ -2. Aug. 5, 1930
Kay ________________ __ June 20,1933
reaching with its upper end "to said opposite end of said
second grate for receiving ash and clinkerfrom the latter,
20
means leading into said discharge shaft for introducing air
through ash and clinker in said shaft, thereby to gasify
2,269,273
at least part of said’ “ash and clinker, trough means lo
2,577,659
cated at the lowermost, end of said upright discharge shaft
and adapted to contain a liquid for quenching said ash 25 2,589,836
and clinker, means for continuously removing ash and
,
clinker from the lowermostend of said discharge shaft,
said fuel material when delivered from said hopper to
said ?rst grate crossing said passageway de?ned by and be
tween said two grates, said’ gaseous products when re 30
v611,293
449,300
114,522
Krogh ct a1. ________ _'_.._ Ian. 6, 1942
Knipping ____________ __ Dec. 4, 1951
Martin ____________ .. Mar. 18, 1952
FOREIGN PATENTS
France __; ________ __'___ July 3, 1926
Germany ____________ __ Sept. 10, 1927
Australia ___________ __'_ Ian. 22, 1942
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