The present invention relates to the supercritical CO.sub.2 generation system applying plural heat sources. The supercritical CO.sub.2 generation system applying plural heat sources includes a pump circulating a working fluid; a plurality of heat exchangers heating the working fluid using an external heat source and including a plurality of constrained heat sources having an emission regulation condition of an outlet end thereof and a plurality of general heat sources without the emission regulation condition; a plurality of turbines operated by the working fluid heated by passing through the heat exchangers; and a plurality of recuperators cooling the working fluid passing through the turbines by heat exchange between the working fluid passing through the turbines and the working fluid passing through the pump, wherein the working fluid passing through the turbine is branched into the recuperators, respectively.

The present invention relates to the supercritical CO.sub.2 generation system applying plural heat sources. The supercritical CO.sub.2 generation system applying plural heat sources includes a pump circulating a working fluid; a plurality of heat exchangers heating the working fluid using an external heat source and including a plurality of constrained heat sources having an emission regulation condition of an outlet end thereof and a plurality of general heat sources without the emission regulation condition; a plurality of turbines operated by the working fluid heated by passing through the heat exchangers; and a plurality of recuperators cooling the working fluid passing through the turbines by heat exchange between the working fluid passing through the turbines and the working fluid passing through the pump, wherein the working fluid passing through the turbine is branched into the recuperators, respectively.

The present invention relates to a supercritical CO.sub.2 generation system applying plural heat sources. According to the present invention, each heat exchanger is effectively disposed according to conditions such as an inlet and outlet temperature, capacity, the number, etc. of the heat source, such that it is possible to use the same or smaller number of recuperators as compared to the number of heat sources, thereby simplifying the system configuration and implementing effective operation.

The present invention relates to a supercritical CO.sub.2 generation system applying plural heat sources. According to the present invention, each heat exchanger is effectively disposed according to conditions such as an inlet and outlet temperature, capacity, the number, etc. of the heat source, such that it is possible to use the same or smaller number of recuperators as compared to the number of heat sources, thereby simplifying the system configuration and implementing effective operation.

To improve the reliability of the Rankine cycle device using a sealed-type expansion machine, the Rankine cycle device 100 according to the present disclosure comprises a pump 1, a heater 2, an expansion machine 3, a radiator 5, and a cooling path 8. The expansion machine 3 comprises an expansion mechanism 11 for extracting a power from the working fluid, an electric power generator 12, a sealed container 10 containing the expansion mechanism 11 and the electric power generator 12, a first inlet 34a, a first outlet 35a, a second inlet 30a, and a second outlet 31a. The radiator 5 is connected to the pump 1 with a flow path to cool the working fluid drained from the second outlet 31a. The cooling path 8 which connects the first outlet 35a to the second outlet 30a has a cooler 4 to cool the working fluid drained from the first outlet 35a.

To improve the reliability of the Rankine cycle device using a sealed-type expansion machine, the Rankine cycle device 100 according to the present disclosure comprises a pump 1, a heater 2, an expansion machine 3, a radiator 5, and a cooling path 8. The expansion machine 3 comprises an expansion mechanism 11 for extracting a power from the working fluid, an electric power generator 12, a sealed container 10 containing the expansion mechanism 11 and the electric power generator 12, a first inlet 34a, a first outlet 35a, a second inlet 30a, and a second outlet 31a. The radiator 5 is connected to the pump 1 with a flow path to cool the working fluid drained from the second outlet 31a. The cooling path 8 which connects the first outlet 35a to the second outlet 30a has a cooler 4 to cool the working fluid drained from the first outlet 35a.

A method for enhanced cold (or warm) steam turbine start in a supplementary fired multi-gas turbine combined cycle plant is disclosed. Boiler supplementary firing, which is normally used to increase steam flow when the plant gas turbine is at maximum load, is used to augment steam production with a partly loaded, temperature matched gas turbine. This is done to satisfy minimum required steam flow for a cold (or warm) steam turbine start. Lighting the supplementary firing burners in the heat recovery steam generator/boiler and setting them at a minimum or low heat load serves to add enough steam, at the proper temperature, to insure a successful cold or warm steam turbine start when the gas turbine load and related steam production capacity from the gas turbine exhaust flow are limited by the need to match the required steam temperature and/or maintain low gas turbine exhaust emissions.

The present invention provides a power plant whose motive fluid is geothermal fluid, comprising: a high-pressure steam turbine to which geothermal fluid is supplied to produce power; a high-pressure condenser to which the geothermal fluid exhausted from the high-pressure turbine after being expanded therein is supplied and condensed, said high-pressure condenser being configured with a port through which non-condensable gases contained in the geothermal fluid supplied to the high-pressure turbine are extractable in an extraction process and further configured to use heat being released during condensation of the high-pressure steam turbine exhaust to vaporize the steam condensate produced therein for producing low pressure steam without non-condensable gases; and a low-pressure steam turbine for producing power from said low-pressure steam without non-condensable gases supplied from said high-pressure condenser.

The present invention provides a power plant whose motive fluid is geothermal fluid, comprising: a high-pressure steam turbine to which geothermal fluid is supplied to produce power; a high-pressure condenser to which the geothermal fluid exhausted from the high-pressure turbine after being expanded therein is supplied and condensed, said high-pressure condenser being configured with a port through which non-condensable gases contained in the geothermal fluid supplied to the high-pressure turbine are extractable in an extraction process and further configured to use heat being released during condensation of the high-pressure steam turbine exhaust to vaporize the steam condensate produced therein for producing low pressure steam without non-condensable gases; and a low-pressure steam turbine for producing power from said low-pressure steam without non-condensable gases supplied from said high-pressure condenser.

A turbine bypass system comprises a bypass path which is selectively operable to deliver hot gases to a gas cooler and a pebble bed positioned in the bypass path upstream of the gas cooler. The pebble bed absorbs heat from the bypass gases and thereby reduces the temperature of the bypass gases prior to delivery of the bypass gases to the gas cooler.