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Патент USA US2108610

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Feb. 15, 19,38.‘
2,108,610
‘C. OTTO
I‘
[OPERATION OF REGENERATIVE OVENS
F'iléd July 28, 1936
2 Sheets-Sheet l
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W
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INVENTOR
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ATTORNEY
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. 15, 1938.
2,108,610
c. OTTO
OPERATION OF REGENERATIVE OVENS
Filed July 28, 1936
Fig. 4
2 Sheets-Sheet 2
Fig. 5
INVENTOR
5“ we”.
-
ATTORNEY
‘
Patented Feb. 15, 1938
2,108,610
UNITED STATES
PATENT - OFFICE
2,108,610
OPERATION OF REGENERATIVE OVENS
Carl Otto, Essen, Germany
Application July 28, 1936, Serial No. 92,968
In Germany May 17, 1935
3 Claims. (O1. 202—-241)
The present invention relates to industrial
. ovens adapted to be heated by rich gas and pro
vided with means for pre-heating the air of
5
combustion by regenerators,‘ in particular‘ under
'fired ovens.
-
-
'
In rich gas-heated ovens in which the air of
combustion is pre-heated by means of regener
ators frequently explosions occur if the place
of the oven with ‘the lower portion of the re
generator spaces, and is a section on line 1-1
of'Figure 2,
Figure 2 is a vertical section on line 11-11 of
Figure 1 the right hand portion of the ?gure being
seen from the left of said line, and the left hand
portion of the ?gure being seen from the right
where the rich gas is shut on‘ and the place of said line,
Figure 3 is an elevation of the oven parts situ
yvhere the gas is burned are far distant from one-v
another and spaces of larger cross sectional area ' ated below the section line III-III of Figure 2, 10
Figure 4 is a detail of Figure 1 in a somewhat
exist between these two places, which explosions
modi?ed
form and on larger scale, and
.
are due to the‘ feature that the air entering said
Figure 5 shows the same details in a view cor
spaces or intentionally supplied to them for de
responding to Figure 2.
graphitizing purposes, is'mixed therein with the
In the Kunder?red oven illustrated in these 15
remainder of'the rich gas so as to form an ex
?gures the stack ?ue a communicates with a
plosive mixture. In order to obviate this draw
back and to remove upon reversal of the draught suction blower b driven by a motor 0 which is
the unburned gas remainder from the shut-off ‘started by the reversing winch (by any suitable
means not shown) at the commencement of the
20 gas distributing pipes of regenerative ovens in
tended for the production of gas and coke, one shutting-off operation of one group of the rich 20
has already 'connected‘the gas distributing pipes 7 gas valves or shortly before. When started, the
after the gas feed has been shut off, that is, while blower b presses waste gases through a check
they communicate in known manner with the valve d and an air box, or pressure equalizing
chamber e into the distributing pipe f. From'
25 . outer air, to the waste heat ?ue fora short period
of time, say one minute, by special connecting the latter the waste gases pass through three
pipes ?tted with valves. In this way the rich >way cocks g, pipes p, and the rich gas valves
h, which likewise are three way cocks, into the
‘gas still existing in the space between the shut
off valve and the burning place is sucked into horizontal rich gas distributing branches m.
The rich gas is supplied through a channel It and
the waste heat ?ue by the pressure below atmos
the ascending pipes 0 through each two rich gas
pheric prevailing in this ?ue.
This mode of operation, however, suffers from
_ the drawback that unburned rich gas arrives in
the waste heat ?ue where, if the waste gases con—
tain air, it may cause explosions. In addition, a
rather large quantityof rich gas gets lost there
by.
-
I
.
The invention has now for its object to obviate
this drawback which object is achieved by inert
40 gases being blown for some time into the rich.
gas feed pipes, after the gas feed has been shut
off. This operation may takelplace immediately
before the commencement of the gas feed. Inert
gases suited for this purpose are for example the
waste gases of the oven or steam. The period of
time required for blowing-in the inert gas is short
when compared with the total duration of the re
valves h either the upper or lower of which is
opened in every regeneration period, into the'hor
'izontal rich gas distributing mains m from which
vertical pipes 12 are branched off. The oven illus
trated is constructed with hair-pin ?ues, so that
the even-numbered pipes n are connected to one
main m and the odd-numbered pipes to the other
main
The valves h thus communicate with
the ascending pipes o as well as with a main m
and with the pipes 12. The three way cock 9
communicates with the pipes 12 and with the waste
heat distributing pipe I and, have further each
an inlet port q for the degraphitizing air.
Upon reversal of the ?ow the following opera
tions take place: First the blower b is actuated
to establish, and thereafter to maintain, a certain
pressure in the waste heat distributing pipe f.‘
generation, it may amount to about one minute. The
three way cocks g are then turned over so as
In. order that the ‘invention may be clearly
understood and readily carried into effect, a pre- > to connect the pipes p withthe distributing pipe f.
ferred embodiment of the means for blowing-in
the’ inert gas is illustrated by way of example in
the accompanying drawings as applied to an un
der?red coke oven. In‘these drawings
Figure 1 shows part of the arched foundation
Next each of the cocks h which till now has fed 50
the rich gas is turned 90 degrees ‘so that waste
heat from the waste heat distributing pipe 1‘ ?ows
into the main-m,till now ?lled with rich gas, and .
into the rich gas branches n connected thereto,
the waste heat pushing away the rich gas still ex
2,108,610
isting in the pipes 112 and n and urging it into the
heating ?ues. Simultaneously also waste heat
gas still present in the gas main m previously
fed with gas.
’
- passes through the other valve h of the same pair
vof valves into the main m which did not lead gas
What I claim and desire to secure by‘ Letters
Patent is:
during the preceding regeneration, period and
pushes out the'air previously held in the last
supply rich fuel gas and degraphitizing air during
mentioned pipes m and their branches n. The
battery waste heat valves are turned over where
by the direction of ?ow in the heating. ?ues is
10
changed. Thereuponthe main m till now not
fed with gas is adjusted to’ gas feed by turning‘
over the respective valve h, whereby the next
regeneration period is started. The time elaps
ing between turning over' the two rich gas valves
15 It will in general be sumcient to push away by
the following waste heat the gas still present
in the distributing pipes. Therefore, simultane
ously with the initiation of the new regeneration
period,~the appropriate three way cocks y can be
‘20 turned into the positions in which, their air in
let ports q are open for the passage of degraphi
tizing air into the rich gas mains m'which are not
‘then feeding rich gas. Degraphitizing air may
thus be supplied during the ?rst section thereof,
25 for example for 10 minutes, with a total duration .
of the regeneration period of 30 minutes.
In the modi?cation illustrated in Figures 4
and‘ 5 the three way cook a is ,replaced by a
simple shut-off valve 1' which in general is per
30 manently open and is closed only when the heat
ing wall situated above the respective pipe 17 is
to be put out of operation. In this arrangement
further the pipes p have trumpet-like enlarged
ends 3 which open at va'certain distance apart
1. In the operation of aKregeneratiVe furnace
comprising a connection operable to'alternately
successive regeneration periods, the method
which consists in passing an inert gas-through
said connection during intervals prior to and 10.
following the passage of degraphitizing air
through said connection.
‘
2. In the operation of a regenerative oven fur
nace having two sets of rich fuel gas supply con
nections, each set supplying rich fuel gas during 15
periods alternating with periods in which rich
fuel gas is supplied by the other set, the method
which consists in passing inert gas, degraphitiz
ing air and inert gas successively through said
supply connections during a period in which the 20
connections are notsupplying fuel gas.
3. In the operation of a regenerative coke
' oven battery having a stack ?ue drawing waste 7
gases away from the battery and having two .sets ,
of rich fuel gas supply connections, each connec 25
tion adapted to have its inlet portion opened to
the atmosphere, each set supplying rich fuel gas
during periods alternating with the periods in
which rich fuel gas is supplied by the other set,
the method which consists in opening the inlet 30
portionof each supply connection to the atmos
phere so that atmospheric air may be drawn
through the connection during periods alternat
ing with periods in which rich fuel gas is supplied
through said connection, and compressing waste 35
35 from the air ports of the rich gas valves h. The:
gases withdrawn from the battery and passing a
arrangement of the suction blower b and of the.
portion ‘of said gases through each connection
during a brief period intervening between each
period during which rich fuel gas is supplied
through said connection and the immediately fol
remaining members serving to blow-in the waste
heat may be the same as in the ?rst embodi
ment. The waste gases are pressed into the pipes
40 i also in this embodiment vfrom the beginning of
the reversal or shortly before and up till the re-~
versal is terminated. The trumpet ends s facing
' the air ports t are so- shaped and the pressure
prevailing in the distributing pipe I is so selected,‘
that only waste gas enters the air ports of- the
valves h and pushes away the remainders of rich
lowing and immediately preceding periods during
which the inlet portion of the connection is open
to the atmosphere, whereby waste gases, degraph
itizing air and waste gases are passed successive
ly through each connection during each period in 45
which said connection is not supplying fuel gas.
CARL O'I'I'O.
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