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13 being greater than that existing in the reservoir 8. The increased coolant flow through the coil 15 just men tioned effects at least partial condensation of the CO2 ?owing into the reservoir. In consequence there occurs ariseinliquidlevelinthereservoirbutwithoutsigni?cant, r. increase in pressure therein. As already stated, in view of the liquefaction of part of the CO2 in the reservoir, the reservoir can be held to small dimensions. 4 in the reservoir therefore falls so that upon delayed open ing of valve 11, CO2 gas flows from the cycle 22 through the line 9 and into the reservoir. ‘By way of numerical example of the pressures which mayexistinplantsoftheinvention,itmaybementioned that for an assumed temperature of 25° to 30° C. in the resrvoir 8, equilibrium of the liquid and gaseous phases will exist at a pressure of some 65 to 75 atmospheres in thereservoir.Atfull-loadoperationoftheplant,thepres sure at point 13 may then be some 150 to 200 atmos pheres, whereas the minimum pressure in the plant at point 14 may be about from 20 to 30 atmospheres. With the plant operating under partial load, the maximum pres sureinthecycle22may befrom 100to150atmos 3,512,358 Conversely, in the event of an increase in the load borne by the plant, incipient decline in shaft speed will open valve 12 while valve 11 will remain closed. Since in the event of such an increase in load the pressure in the reservoir 8 will be higher than that at the point 14, open ingofvalve12willresultina?owofworkingsubstance fromthereservoirthroughline10'intothecycle22.This 15 pheres,whereastheminimumpressurethereinandthe will continue until regulator 17 closes valve 12 in re sponse to a signal from the tachometer 18. The pres sure drop which would otherwise occur in the reservoir 8 in consequence of this loss of gas is compensated by pressure in the reservoir (which latter depends upon the temperature) may remain substantially unchanged. Obviously the plant of the invention is not limited to these pressures and may operate in other pressure ranges, partialevaporationoftheliquidWorkingsubstancetherein. 20 forexample'whenthetemperatureinthereservoirisheld In the embodiment of FIG. 2 the reservoir connects to the cycle 22 at one point only. Thus line 9 containing valve 11 connects to the cycle at the point 13 of maximum pressure immediately downstream of the compressor 3'. The embodiment of FIG. 2 further differs from that of FIG. 1 in that a heating coil 26 is provided in the liquid space of the reservoir. This heating coil connects to the coolant coil 7 in the cooler 6 and is thereby supplied with water, heated upon its passage through the cooler 6. By means of valves 27 and 28 coupled together for 30 employed. adjustment in opposite senses, a greater or lesser pro portion of the coolant water emerging from the coil 7 can be delivered for ?ow through the heating coil 26. In the plant of FIG. 2 the electric generator 4 includes a load indicator (not shown). This load indicator delivers a set value signal to a regulator 30. This set value signal is compared in the regulator 30‘ with an actual value signal representative of liquid level existing in the reser voir and delivered to the regulator 30 via signal channel 31. In the event of an increase in load, the set 'value signal delivered from the generator 4 to the regulator 30 will fall. The resulting difference between the signals delivered More generally,theinventionincludesallmodi?cations of and departures from the embodiments hereinabove de scribed properly following within the spirit and scope of the appended claims. I claim: ~ 1. A closed-cycle CO2 gas turbine power plant com prising a source of heat, a gas turbine, a cooler and a compressor connected into a closed cycle, a reservoir, a line connecting the reservoir to the cycle, means to cool 40 the interior of the reservoir, and means to control the ?ow of coolant through said cooling means and the open ing of said line in dependence on the load on the plant. 2.A gasturbinepowerplantaccordingtoclaim1in cluding a second line connecting the reservoir to a point to the regulator 30 via lines 29 and 31 causes the regu§ lator30todeliverasignalviachannel32anditsbranch 45 ofdifferentpressureinthecycle,saidlinesincluding 32a which adjusts valves 27 and 28 in the senses re quired to increase the ?ow of heating ?uid through the coil 26. That is, the openings of valves 27 and 28 are valves operated in opposite senses in response to ?uctua tions in load. ' ‘3.A gasturbinepowerplantaccordingtoclaim1in cluding heating means in the liquid space of the reservoir increased and decreased respectively. Consequently, lique ?edworkingsubstancewillbeevaporatedinthereser 50 andmeanstoadjustthe?owofaheatingmediumthrough voir,raisingthepressuretherein.A delayedoutputsig nal from the regulator 30 then opens valve 11 via chan nel 33, thus permitting gaseous working substance to flow from the reservoir into the cycle 22. A further output signal may be delivered from regulator 30 via signal ' power regulator. channel 34 to reduce or cut off the flow of coolant through valve 16, and hence through the cooling coil 15. UNITED STATES PATENTS The same operations take place in the event of a rise inliquidleveloccurringinthereservoir8duetosome 60 2,929,217 3/1960 Collman. malfunction, even in the face of a constant value of set point input signal to the regulator 30‘ from the generator 4. When the load falls or when the actual level of liquid falls in the reservoir 8, producing in either event a 'value of actual liquid level signal in channel 31 below that corresponding to the set point signal instantaneously sup plied by the generator, there will be produced a partial condensation of the gaseous CO2 in the reservoir in con sequence of a reduction effected by the regulator 30‘ of ?ow of heating ?uid through the coil 26. The pressure 3,218,807 11/1965 Berchtoldetal. 3,220,191 11/1965 Berchtold. 3,221,511 12/1965 Garrett. ‘3,252,286 5/1966 Whitelaw. 65 MARTIN P.SCHWADRON, PrimaryExaminer R. R. BUNEVICH, Assistant‘Examiner at other values, for example by arti?cial means. The invention is not limited to the embodiments illus trated. It can be applied to plants having two or more shafts with plural compression and expansion stages. It is moreover possible to embody the invention in plants in which the CO2 is in partially lique?ed condition in the closed flow cycle itself. Similarly the embodiments de scribed are only exemplary of the control mechanisms, measured variables, and set point signals which can be said heating means directly with changes in load on the plant. 4.A closedcyclegasturbinepowerplantaccordingto claim 1 wherein said control means include an output 2,345,950 4/1944 Salzmann. References CitedPDF Image | CLOSED-CYCLE GAS TURBINE POWER PLANT
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