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Патент USA US2108614

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Feb. 35, 1938.
A. ROSCH ET AL
2,M,6M
EXTRACTION TURBINE ARRANGEMENT
Filed Dec. 2, 1956 \
Fig. |.
Inventovs;
Arthur‘ Roach,
Herbert Neumann,
b8
Their‘ Attorn@\d_
Patented Feb. 15, 1938
2,108,614
UNITED STATES’
PATENT OFFICE ‘
2,108,614
EXTRACTION TURBINE ARRANGEMENT
Arthur Bosch, Brieselang, near Nauen, and
Herbert Neumann, Berlin-Wilmersdorf, Ger
many, ,assignors to‘ General Electric Company,
a corporation of New York
Application December‘ 2, 1936, Serial No. 113,920
In Germany January 23, 1936
4 Claims.
vThe present invention relates to extraction
and mixed pressure turbine arrangements and
more especially to a mechanism for controlling
‘ the ?ow of cooling water to the condenser for
an extraction or mixed pressure turbine. The
maintaining of constant ?ow of cooling water
through the condenser leads to considerable
waste and poor economy if the turbine is subject
to considerable ?uctuation in extraction ?uid.
The object of our invention is to provide an
improved construction and arrangement of
mixed pressure turbine control whereby the e?i
ciency, in particular the economy of the cooling
water circulation, is substantially improved.
15 This is accomplished in accordance with our in
vention by the provision of a control mechanism
for the cooling water circulating pump, which
mechanism controls the flow of cooling water
through the condenser in response to changes in
V20 the amount of exhaust elastic ?uid from the
turbine.
.
I
For a better understanding of what we be
lieved to be novel and our invention, attention is
directed to the following description and the
25 claims appended thereto in connection with the
accompanying drawing.
In the drawing, Fig. 1 illustrates a turbine ar
rangment embodying our invention and Fig. 2
shows a modi?cation of a part of Fig. 1.
The arrangement of Fig. 1 comprises an ex-'
traction turbine H) with an inlet valve H for
controlling the ?ow of elastic ?uid to the turbine
and an- exhaust conduit l2 for discharging ex
haust ?uid from the turbine.
A conduit I 3 is
00 C21 connected to an intermediate vpoint of the casing
for extracting elastic ?uid therefrom in which
case the turbine operates as an extraction turbine
or for conducting elastic ?uid of a lower pressure
than the inlet pressure to the turbine in which
40 case the latter operates as a mixed pressure tur
bine.
An interstage valve I4 is provided for control
ling the ?ow of elastic ?uid from the extraction
stage to the succeeding stage. ' Opening of the
45 valve I4 causes an increased ?ow of elastic ?uid
from the extraction ‘stage to the succeeding stage
and consequently a decreased ?ow of elastic ?uid
through the extraction conduit‘l3. Vice-versa,
closing of the interstage valve 14 increases the
?ow of elastic ?uid from the extraction conduit
l3 through the conduit l3, or from another view
point, increases the pressure in the extraction
conduit l3. In the usual type of arrangement
the pressure in'the conduit I3 is maintained con
5 stant. This means that during constant mechan
(Cl. 60—95)
ical load output condition an increased ?ow of
elastic ?uid through the extraction conduit‘ I3
causes a decrease in pressure in the lower stages,
in particular in the stage behind the interstage
.valve I4 as regards the direction of flow of ?uid
through the turbine. The ?uid exhausted from
the turbine is discharged through the exhaust
conduit l2 and condensed in a condenser l5,
which latter includes a number of cooling tubes
I6 through which cooling ?uid such as water is
circulated to e?ect condensation of exhaust ?uid
from the turbine. The condensate is discharged
from the condenser through a discharge conduit
I'L, The cooling medium such as water in the
present instance is supplied to the condenser by
means of a rotary pump [8 having an inlet con
duit l9 connected to a suitable source of cooling
medium, (not shown), and a discharge conduit
l9a connected to a header 2!! of the condenser.
The pump iii in the present instance is driven by
an electric motor 2! operated at substantially
constant speed. The pump i8 is provided with
a bypass 22 having one end 23 connected to the
discharge end l?a of the pump and another end
24 connected to the inlet IQ of the pump. This
bypass serves to return a portion of the ?uid dis
charged from the pump to the pump inlet. In
order to utilize the energy of the ?uid thus by
passed, the end 24 of the conduit 22 is preferably
provided with a nozzle 25 disposed within the
inlet of the pump. The amount of cooling me
dium thus by-passed is controlled by a valve 26
disposed within- the conduit 22 and connected to
automatic control means which in the present
instance includes a di?erential pressure respon
sive device having two bellows 2‘! and 28 con
nected to the right-hand end of a lever 29 having
its left-hand end pivotally connected to the stem
of valve 26 and an intermediate point supported
on a fulcrum 30. The bellows 2‘! communicates
through a pipe 3| with the extraction conduit l3
and the bellows 28 communicates through a pipe
32 with the turbine at a point past the interstage
valve M. In the present instance the pipe 32 is
connected to the turbine stage succeeding the
extraction stage.
15
205
35
45
'
.- With this arrangement, an increasing ?ow of
?uid through the extraction conduit I3 causes,
due to the decreasing pressure behind the ex
traction valve, downward movement of the right
50
hand end of the lever 29 which in turn effects
opening movement of the bypass valve 26, thus
causing an increase in the amount of bypassed
cooling medium and consequently a decreasing
?ow of cooling medium to the condenser in ac 55.
2
2,108,614
cordance with the decrease of the amount of ex
haust ?uid from the turbine.
Whereas in the above example the ?ow of cool
ing medium to the condenser is controlled by
means of a bypass to the pump, such ?ow may
dium in responseto changes of the amount of
elastic ?uid ?owing through the conduit.
2. Extraction and mixed pressure turbine ar
rangement including the combination of an elas
tic ?uid turbine, a condenser for receiving ex
also be controlled by controlling the speed of the
haust ?uid from the turbine, a conduit con
motor or prime mover for the pump.
especially advantageous where the pump is driv
nected to an intermediate stage of the turbine,
means for conducting cooling medium through
en by a turbine. An arrangement of this kind is
shown in Fig. 2 in which a pump 35 for forcing
the condenser comprising a pump, a motor for
driving the pump, a bypass including a valve for 10
This is
cooling medium to a condenser is driven by an
auxiliary turbine or prime mover 36 having a
valve 31 for controlling the ?ow of operating
?uid thereto. The valve 31 is pivotally con
nected to the left-hand end of a lever 38, which
latter has a right-hand end supported on a ful
crum 39 and an intermediate point connected to
a differential pressure-responsive device in the
form- of bellows 40 and 4!, corresponding to the
Other_
wise the arrangement is similar to that of Fig. 1.
20 bellows 28 and 21 respectivelyof Fig. 1.
During operation a decrease in pressure in the
turbine stage succeeding the extraction valve
causes collapsing of the bellows 40 and conse
the pump and means for automatically control
ling the valve in response to changes of the pres
sure in the conduit and the pressure in the low
pressure part of the turbine past said conduit.
3. Extraction and mixed pressure turbine ar
rangement including the combination of an elas
tic ?uid turbine, a condenser for receiving elastic
fluid exhausted from the turbine, a conduit con
nected to an intermediate stage of the turbine,
means including a pump for forcing cooling me
dium into the condenser and means for auto
matically controlling the operation of the pump
in response to changes in the amount of ?uid
exhausted from the turbine, said means includ~
quently downward movement of the left-hand. ing a device responsive to the difference in pres~
end of the lever 38, resulting in closing move
sure in the conduit and a low pressure turbine
ment of the valve 31. This reduces the ?ow of stage behind the conduit as regards the direction
operating ?uid to the auxiliary turbine or prime of ?ow through the turbine.
mover 36 and consequently reduces the speed of
4. Extraction and mixed pressure turbine ar
the pump 35 and the amount of cooling medium rangement including the combination of a turconveyed thereby.
bine, a condenser for receiving ?uid exhausted
Having described the method of operation of from the turbine, a conduit connected to an in
our invention, together with the apparatus which termediate stage of the turbine, valve means for
we now consider to represent the best embodi
controlling the ?ow of elastic ?uid to the tur~
ment thereof, we desire to have it understood bine, valve means for controlling the ?ow of elas
that the apparatus shown is only illustrative and tic ?uid from the intermediate stage to the suc
that the invention may be carried out by other ceeding stage, means including a pump and a
means.
motor driving the pump for forcing cooling me~
What we claim as new and desire to secure
dium into the condenser, a bypass for the pump,
the bypass including a valve for controlling the
40. by Letters Patent of the United States is:
1. Extraction and mixed pressure turbine ar- . ?ow of cooling medium therethrough and a dis
rangement including the combination of an elas
charge nozzle disposed within the inlet of the
pump, and means for automatically controlling
tic fluid turbine, a condenser for receiving ex
the last named valve comprising a di?erential
haust ?uid from the turbine, 'a conduit con
nected to an intermediate stage of the turbine, pressure responsive device having one bellows
means including a pump for conducting cooling communicating with the conduit and another
IO Ul
medium to the condenser, and means including a
pressure-responsive device connected to the con
duit and an adjustable bypass for the pump for
50 automatically controlling the ?ow of cooling me
bellows communicating with the succeeding stage.
ARTHUR ROSCH.
HERBERT NEUMANN.
‘
‘
40
45
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