JP5117431B2 - CO2 recovery type gas turbine plant - Google Patents

Description

  The present invention relates to a carbon dioxide recovery type gas turbine plant, and more particularly to a carbon dioxide recovery type gas turbine plant having carbon dioxide as a main component of a working fluid.

  In recent years, there has been an increasing movement to suppress carbon dioxide emissions, which are considered to cause global warming. Since gas turbine plants that generate electricity using combustion gas generated by the combustion of fossil fuels emit carbon dioxide, many studies have been conducted to recover the generated carbon dioxide.

  There are two methods for recovering carbon dioxide from gas turbine plants: “post-combustion recovery method” for recovering carbon dioxide from combustion exhaust gas and “pre-combustion recovery method” for removing carbon from fuel. The thermal energy required to remove the carbon component from the plant is large, and the problem is to reduce the plant efficiency. As another method, there is an “oxygen combustion method” in which hydrocarbon fuel is burned under pure oxygen conditions so that the generated combustion gas is limited to carbon dioxide and water vapor to facilitate the recovery of carbon dioxide. The “oxygen combustion method” can be realized by a closed cycle gas turbine that circulates in the gas turbine plant using carbon dioxide as a main component of the working fluid of the gas turbine.

  Non-Patent Document 1 is an example of a closed-cycle carbon dioxide recovery gas turbine plant.

  In the gas turbine plant described in Non-Patent Document 1, a working fluid mainly composed of carbon dioxide and steam compressed by a compressor is supplied to a combustor via a regenerative heat exchanger, and the combustor The turbine is driven by the working fluid that has become hot due to combustion of fuel. And the closed cycle of the structure which flows in into the said compressor the exhaust gas after heat-recovering with the exhaust heat recovery boiler from the exhaust gas discharged | emitted from the turbine is formed. And the heat | fever obtained by the closed cycle is collect | recovered effectively by combining the steam turbine system | strain which made the heat obtained from the waste gas the exhaust heat recovery boiler as a heat source.

  Another example of the carbon dioxide recovery type closed cycle is a gas turbine plant described in JP-A-4-279729. In the gas turbine plant disclosed in Japanese Patent Laid-Open No. 4-279729, a part of a working fluid mainly composed of carbon dioxide compressed by a compressor is branched and supplied to a combustor, and fuel is combusted in the combustor. The turbine is driven by the working fluid that has become hot. The exhaust gas after heat recovery from the exhaust gas discharged from the turbine by the exhaust heat recovery boiler forms a closed cycle that finally returns to the compressor via the condenser.

  Further, another part of the working fluid branched at the outlet of the compressor is liquefied by a liquefaction device to recover carbon dioxide. In the configuration of the gas turbine plant described in Japanese Patent Laid-Open No. 4-279729, since the high-pressure working fluid is branched, the in-house power required for liquefying carbon dioxide by the liquefaction device can be reduced.

  On the other hand, Japanese Patent Application Publication No. 2006-514209 discloses a technique related to a humid air turbine cycle capable of recovering carbon dioxide. According to the description in JP-T-2006-514209, the temperature is raised via a regenerative heat exchanger that humidifies the air compressed by the compressor with a humidifier and recovers heat from the exhaust gas of the gas turbine. By supplying the produced air to the combustor, heat recovery from the exhaust gas of the gas turbine is efficiently performed without installing a steam turbine system. JP-T-2006-514209 proposes to recirculate and mix part of the exhaust gas from the gas turbine to the intake air of the compressor to remove carbon dioxide from the compressor discharge air. However, the working fluid of the gas turbine cycle in JP-T-2006-514209 is air, and the amount of exhaust gas to be recirculated is a part rather than the total amount.

JP-A-4-279729 JP-T-2006-514209

"Proposal and Challenges of CO2 Recovery Type High Efficiency Coal Gasification Combined Cycle Power Generation System" Power Central Research Institute Report M07003, October 2007

  In the closed-cycle gas turbine plant disclosed in Non-Patent Document 1 and Patent Document 1, the equipment tends to be large and complicated by combining the steam turbine system to recover the heat of the exhaust gas.

  On the other hand, with respect to Patent Document 2, although the steam turbine is unnecessary, the working medium of the gas turbine is basically air, and carbon dioxide mixed in the discharge air of the compressor is removed. Therefore, in the configuration of Patent Document 2, the method of removing carbon dioxide mixed in the air becomes chemical separation or membrane separation, and there are problems in terms of reduction in plant efficiency due to energy required for separation, enlargement of the separation device, and the like. There is. Moreover, in the structure of patent document 2, if it considers liquefying and using or disposing the carbon dioxide after isolate | separating, it will be a subject that more energy is needed.

  An object of the present invention is to efficiently recover heat from the exhaust gas of a gas turbine in consideration of even a carbon dioxide liquefaction process in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component. An object is to provide an improved carbon dioxide recovery gas turbine plant.

  The carbon dioxide recovery type gas turbine plant of the present invention includes a compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies moisture in the working fluid compressed by the compressor, and the humidifier. A combustor that mixes and burns oxygen and fuel in the working fluid humidified in step 1, a turbine driven by exhaust gas mainly composed of carbon dioxide generated by the combustor, and exhaust gas discharged from the turbine A regenerative heat exchanger that exchanges heat with the working fluid that has passed through the humidifier; and a water recovery device that recovers moisture in the exhaust gas by cooling the exhaust gas that has passed through the regenerative heat exchanger. An exhaust gas path that branches off from the downstream side of the apparatus and extracts a part of the exhaust gas mainly composed of carbon dioxide after passing through the water recovery apparatus is disposed, and the exhaust gas carbon dioxide led through the extract air path A separation device for separating is installed, and an exhaust gas path is provided that branches from the downstream side of the water recovery device and allows the remaining exhaust gas after passing through the water recovery device to flow again into the compressor inlet. And

  The carbon dioxide recovery type gas turbine plant of the present invention includes a compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies moisture in the working fluid compressed by the compressor, and the humidification. A combustor in which oxygen and fuel are mixed in a working fluid humidified by a combustor, a turbine driven by exhaust gas mainly composed of carbon dioxide generated by the combustor, and exhaust gas discharged from the turbine A regenerative heat exchanger that exchanges heat between the working fluid that has passed through the humidifier and a water recovery device that recovers moisture in the exhaust gas by cooling the gas that has passed through the regenerative heat exchanger, A cooler that cools the working fluid mainly composed of carbon dioxide that passes through the compressor and is supplied to the humidifier between the compressor and the humidifier, and branches from between the cooler and the humidifier The cold An extraction passage for taking out a part of the cooled working fluid after passing through the vessel, and a separation device for separating carbon dioxide of the working fluid guided through the extraction passage is installed, on the downstream side of the water recovery device The exhaust gas path for allowing the exhaust gas after passing through the water recovery device to flow again into the compressor inlet is provided.

  The carbon dioxide recovery type gas turbine plant of the present invention includes a compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies moisture in the working fluid compressed by the compressor, and the humidification. A combustor in which oxygen and fuel are mixed in a working fluid humidified by a combustor, a turbine driven by exhaust gas mainly composed of carbon dioxide generated by the combustor, and exhaust gas discharged from the turbine A regenerative heat exchanger that exchanges heat between the working fluid that has passed through the humidifier and a water recovery device that recovers moisture in the exhaust gas by cooling the gas that has passed through the regenerative heat exchanger, A cooler that cools a working fluid mainly composed of carbon dioxide that passes through the compressor and is supplied to the humidifier between the humidifier and the humidifier, from between the humidifier and the regenerative heat exchanger Branch before A bleed passage for taking out a part of the humidified working fluid after passing through the humidifier is provided, a separation device for separating carbon dioxide of the working fluid guided through the bleed passage is installed, and downstream of the water recovery device An exhaust gas path through which the exhaust gas that has passed through the water recovery device from the side flows again into the compressor inlet is provided.

  The carbon dioxide recovery type gas turbine plant of the present invention includes a compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies moisture in the working fluid compressed by the compressor, and the humidification. A combustor in which oxygen and fuel are mixed in a working fluid humidified by a combustor, a turbine driven by exhaust gas mainly composed of carbon dioxide generated by the combustor, and exhaust gas discharged from the turbine A regenerative heat exchanger that exchanges heat between the working fluid that has passed through the humidifier and a water recovery device that recovers moisture in the exhaust gas by cooling the exhaust gas that has passed through the regenerative heat exchanger, The machine is composed of a low-pressure compressor and a high-pressure compressor that further compresses the working fluid compressed by the low-pressure compressor, and between the low-pressure compressor and the high-pressure compressor or the high-pressure compressor. A cooler that cools the working fluid between the humidifier and the humidifier; after branching between the cooler and the high-pressure compressor or between the high-pressure compressor and the humidifier and passing through the cooler A bleed passage for taking out a part of the cooled working fluid or a part of the cooled working fluid after passing through the high-pressure compressor is disposed, and carbon dioxide of the working fluid guided through the bleed passage is separated. The separation device is installed, and an exhaust gas path for allowing the exhaust gas after passing through the water recovery device to flow again into the compressor inlet from the downstream side of the water recovery device is provided.

  According to the present invention, in a closed cycle gas turbine plant driven by a working fluid whose main component is carbon dioxide, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process, thereby improving the overall efficiency. An improved carbon dioxide recovery gas turbine plant can be realized.

1 is a plant system diagram showing a schematic configuration of a carbon dioxide recovery gas turbine plant that is a first embodiment of the present invention. The plant system diagram which shows schematic structure of the carbon dioxide recovery type gas turbine plant which is 2nd Example of this invention. The plant system diagram which shows schematic structure of the carbon dioxide recovery type gas turbine plant which is 3rd Example of this invention. The plant system diagram which shows schematic structure of the carbon dioxide recovery type gas turbine plant which is 4th Example of this invention. The plant system diagram which shows schematic structure of the carbon dioxide recovery type gas turbine plant which is 5th Example of this invention. The comparison of the TS diagram of the cycle which uses air as a working fluid, and the TS diagram of the cycle which uses carbon dioxide as a working fluid.

  A carbon dioxide recovery type gas turbine plant which is an embodiment of the present invention will be described with reference to the drawings.

  First, a carbon dioxide recovery type gas turbine plant according to a first embodiment of the present invention will be described with reference to FIG.

  The carbon dioxide recovery type gas turbine plant of the first embodiment shown in FIG. 1 includes a compressor 1 that compresses a working fluid 41 mainly composed of carbon dioxide to generate a high-pressure working fluid 42, a fuel 81, A combustor 2 that burns oxygen 82 to generate high-temperature exhaust gas 45, a turbine 3 that is driven by the high-temperature exhaust gas 45 that is generated in the combustor 2, and a generator 9 that rotates and generates power by driving the turbine 3 are installed. Has been.

  The turbine 3 is driven by the high temperature exhaust gas 45, and the exhaust gas 46 discharged from the turbine 3 flows into the regeneration heat exchanger 4 installed downstream of the turbine 3, and the regeneration heat exchanger 4 performs the regeneration heat. Heat is recovered from the exhaust gas 46 by exchanging heat with the working fluid 43 supplied to the exchanger 4.

  The exhaust gas 46 heat recovered by the regenerative heat exchanger 4 flows into a feed water heater 5 installed downstream of the regenerative heat exchanger 4, and water supplied to the feed water heater 5 by the feed water heater 5. And heat is recovered from the working fluid 47 to generate hot water 71.

  The exhaust gas 47 heat-recovered by the feed water heater 5 flows into the water recovery device 6 installed downstream of the feed water heater 5, and the circulating water 78 is sprayed by the water recovery device 6 to the exhaust gas 47. Condensed moisture.

  Most of the exhaust gas 48 after passing through the water recovery device 6 is installed downstream of the water recovery device 6, and a carbon dioxide compressor 10 that compresses the exhaust gas 48 mainly composed of the inflowed carbon dioxide, and a compression Is supplied to a carbon dioxide separator 100 having a condenser 11 that cools the exhaust gas mainly containing carbon dioxide and condenses and separates moisture, and separates moisture from the exhaust gas 48 by the carbon dioxide separator 100, Recovered as high-pressure carbon dioxide.

  Another part of the exhaust gas 48 after passing through the water recovery device 6 is branched upstream of the carbon dioxide separator 100 and flows again into the compressor 1 as the working fluid 41 through the recirculation path to form a closed cycle. To do.

  The high-pressure working fluid 42 compressed by the compressor 1 flows into the humidifier 7 before being supplied to the combustor 2, and the humidifier 7 sprays hot water 71 supplied from the feed water heater 5. It is humidified by doing.

  The working fluid 43 humidified by the humidifier 7 is supplied to the regenerative heat exchanger 4 installed on the downstream side of the humidifier 7, and the high-temperature exhaust gas discharged from the turbine 3 by the regenerative heat exchanger 4. The heat stored in the exhaust gas 46 is recovered by exchanging heat with 46.

  The working fluid 44 heated in the regenerative heat exchanger 4 is supplied from the regenerative heat exchanger 4 to the combustor 2, and the fuel 81 and oxygen 82 are combusted in the combustor 2 to become high-temperature exhaust gas 45. The turbine 3 is supplied to drive the turbine 3.

  Condensed water 72 recovered by the water recovery device 6 is supplied to the lower space of the humidifier 7, and the stored water stored at the bottom of the humidifier 7 is the water 73 pressurized by the pump 61. By being supplied to the feed water heater 5, it is configured to circulate between the humidifier 7 and the feed water heater 5.

  Further, a part of the condensed water condensed in the water recovery device 6 constitutes a circulation system that is circulated back to the water recovery device 6 again after being cooled by the cooler 63 as the circulating water 78. In addition, the excess of the condensed water condensed by the water recovery device 6 is discharged out of the system from this circulation system as waste water.

  Next, the flow of the working fluid in the carbon dioxide recovery type gas turbine plant of the present embodiment will be described.

  In the carbon dioxide recovery type gas turbine plant shown in FIG. 1, the working fluid 41 before the compressor inlet mainly composed of carbon dioxide is compressed by the compressor 1 and flows into the humidifier 7 as a high-pressure working fluid 42. To do.

  Since the warm water 71 is supplied from the feed water heater 5 to the humidifier 7, the warm water 71 evaporates in the humidifier 7 and takes latent heat from the working fluid 42, so that the working fluid 42 is cooled. 43.

  The cooled working fluid 43 flows into the regenerative heat exchanger 4 from the humidifier 7 and becomes a working fluid 44 whose temperature is increased by exchanging heat with the exhaust gas 46 discharged from the turbine 3 in the regenerative heat exchanger 4. Flows into the vessel 2.

  In the combustor 2 that supplies the working fluid 44 from the regenerative heat exchanger 4, the fuel 81 and the oxygen 82 are combusted to generate high-temperature exhaust gas 45, and the working fluid 45 flows into the turbine 3. The high-temperature exhaust gas 45 rotates the generator 9 by driving the turbine 3 to generate electric power, which becomes exhaust gas 46 and is discharged from the turbine 3.

  The exhaust gas 46 discharged from the turbine 3 flows into the regenerative heat exchanger 4 and exchanges heat with the working fluid 43 to generate a heated working fluid 44, and then the feed water heater on the downstream side of the regenerative heat exchanger 4 5 flows into.

  In the feed water heater 5, the exhaust gas 46 exchanges heat with water 73 supplied to the humidifier 7 to form hot water 71, and then becomes exhaust gas 47 and flows into the water recovery device 6 on the downstream side of the feed water heater 5.

  The main components of the exhaust gas 47 are carbon dioxide and water vapor. Most of the water vapor is condensed by spraying the circulating water 78 cooled by the cooler 63 in the water recovery device 6 and cooling the exhaust gas 47, The exhaust gas 48 mainly composed of carbon is discharged from the water recovery device 6.

  Most of the exhaust gas 48 becomes the working fluid 41 via the recirculation path 12 and re-enters the compressor 1 to form a closed cycle gas turbine plant.

  In order to recover the carbon dioxide, the carbon dioxide corresponding to the amount generated by the supply of the fuel 81 and the oxygen 82 in the combustor 2 in the exhaust gas 48 is used for the carbon dioxide separator installed downstream of the water recovery device 6. An exhaust gas 48 mainly composed of carbon dioxide is guided to 100 carbon dioxide compressors 10 through the extraction passage 14, and the carbon dioxide compressor 10 compresses the carbon dioxide. Further, the condenser 11 provided in the carbon dioxide separator 100 cools the exhaust gas mainly composed of carbon dioxide compressed by the carbon dioxide compressor 10 and condenses and separates moisture, thereby being recovered as high-pressure carbon dioxide gas. The

  The flow of the water system in the carbon dioxide recovery type gas turbine plant shown in FIG. 1 will be described. In the humidifier 7, an operation in which part of the hot water 71 supplied from the feed water heater 5 is evaporated and supplied from the compressor 1. Although mixed with the fluid 42, the remaining hot water 71 does not evaporate and flows down to the bottom of the humidifier 7 as water 73.

  The water 73 staying at the bottom of the humidifier 7 is increased in pressure by the pump 61 and supplied again to the feed water heater 5, and the amount of heat lost as evaporation latent heat in the humidifier 7 is recovered by heat exchange with the exhaust gas 46. .

  The evaporated portion of the hot water 73 evaporated by the humidifier 7 is condensed and recovered by the water recovery device 6 via the regenerative heat exchanger 4, the combustor 2, and the turbine 3.

  A part of the condensed water 72 recovered by the water recovery device 6 becomes the circulating water 78 supplied to the water recovery device 6 again through the cooler 63. Further, of the remaining water of the condensed water 72 recovered by the water recovery device 6, surplus water corresponding to the amount generated by the combustion of the fuel 81 and oxygen 82 in the combustor 2 is discharged out of the system as waste water, The other water is supplied to the humidifier 7 as condensed water 72.

  Next, the specific operation of the carbon dioxide recovery type gas turbine plant of the present embodiment will be described. In FIG. 1, the working fluid 41 mainly composed of carbon dioxide before the inlet of the compressor 1 is about 0.1 MPa, about It exists in the state of 40 degreeC. In addition, as a composition of the working fluid 41, about 97% of carbon dioxide and about 3% of water vapor | steam are assumed by mass flow rate ratio.

  The working fluid 41 is compressed to a predetermined pressure ratio of about 15 by the compressor 1, and flows into the humidifier 7 as a working fluid 42 having a pressure of about 1.5 MPa and a temperature of about 300 ° C.

  The humidifier 7 is assumed to be a humidifying tower in which a filling material is installed inside and the hot water 71 flowing down the surface of the filling material and the working fluid 42 are brought into gas-liquid contact. It is also possible to use a humidifier that sprays the gas and contacts the working fluid with gas and liquid.

  In the humidifier 7, a part of the hot water 71 evaporates to remove latent heat from the working fluid 42, and the working fluid 43 is cooled to about 200 ° C. Further, by this humidification, the mass flow rate ratio of water vapor contained in the working fluid 43 becomes about 20%.

  The working fluid 43 that has passed through the humidifier 7 flows into the regenerative heat exchanger 4, and heat is exchanged with the exhaust gas 46 in the regenerative heat exchanger 4, so that the temperature rises to about 600 ° C. and flows into the combustor 2. .

  In the combustor 2, oxygen 82 and fuel 81 are combusted, and the temperature of the exhaust gas 45 is raised to a predetermined combustion temperature of about 1300 ° C. by this combustion reaction. Note that methane is assumed as the fuel in this embodiment.

  The exhaust gas 45 that has passed through the combustor 2 drives the turbine 3 at a predetermined expansion ratio of approximately 14, and is discharged from the turbine 3 as an exhaust gas 46 having a pressure of approximately 0.11 MPa and a temperature of approximately 700 ° C.

  The exhaust gas 46 is cooled to about 400 ° C. by exchanging heat with the working fluid 43 in the regenerative heat exchanger 4 installed on the downstream side of the turbine 3, and then the feed water heating installed on the downstream side of the regenerative heat exchanger 4 Flows into the vessel 5.

  In the feed water heater 5, the exhaust gas 46 becomes warm gas 73 that is heated by exchanging heat with the water 73 to become exhaust gas 47 cooled to about 200 ° C. and flows into the water recovery device 6 on the downstream side of the feed water heater 5. To do.

  The water recovery method of the water recovery device 6 is a method of spraying water droplets and directly cooling and condensing the exhaust gas 47. The exhaust gas 47 cooled by the water recovery device 6 eventually becomes exhaust gas 48 having a pressure of about 0.1 MPa and a temperature of about 40 ° C.

  Most of the exhaust gas 48 discharged from the water recovery device 6 re-enters the compressor 1 via the recirculation path 12 to form a closed cycle gas turbine plant.

  On the other hand, the exhaust gas 48, which is generated by the combustion reaction of the fuel 81 and the oxygen 82 in the combustor 2 and is exhausted from the turbine 3, is led to the carbon dioxide separation device 100 through the extraction passage 14, and this The carbon dioxide compressor 10 constituting the carbon dioxide separator 100 compresses the exhaust gas mainly composed of carbon dioxide, further cools and condenses the moisture by the condenser 11, and collects it as high-pressure carbon dioxide gas. This carbon dioxide gas is sent to a carbon dioxide treatment facility (not shown) and recovered as liquefied carbon dioxide gas or high-pressure carbon dioxide gas. When producing liquefied carbon dioxide gas, it is necessary to cool the carbon dioxide gas in a high pressure state, so if high-pressure carbon dioxide gas can be obtained as in this embodiment, liquefied carbon dioxide gas can be produced with less power. It is possible to improve the efficiency of the entire system.

  By the way, in the closed cycle in the carbon dioxide recovery type gas turbine plant of the present embodiment, since the main component of the working fluid is carbon dioxide, more effective heat recovery can be expected. In order to explain the reason, FIG. 6 shows a comparative example in the case where the working fluid is air and a TS diagram in the case where the working fluid according to the present embodiment is carbon dioxide.

  In FIG. 6, when the pressure and temperature of the working fluid at the turbine inlet are the same, if carbon dioxide in this embodiment is used as the working fluid, carbon dioxide has a smaller specific heat ratio than air, so the temperature of the working fluid at the turbine outlet Increases from T3 to T3 ′ for the comparative air. From this, in the closed cycle in the carbon dioxide recovery type gas turbine plant of the present embodiment, it is considered that the amount of heat recoverable from the exhaust gas of the working fluid discharged from the turbine increases.

  In general, in order to efficiently recover heat from exhaust gas using a heat exchanger, it is desirable that the temperature difference between the working fluids exchanged in the regenerative heat exchanger 4 is large.

  In the carbon dioxide recovery type gas turbine plant of this embodiment described above, the working fluid 43 supplied to the regenerative heat exchanger 4 is cooled by the humidifier 7 installed on the upstream side thereof. Further, since the exhaust gas 46 discharged by driving the turbine 3 is a working fluid mainly composed of carbon dioxide having a small specific heat ratio, the temperature drop at the same expansion ratio is small, and a high exhaust gas temperature can be maintained.

  Under the operating conditions of the carbon dioxide recovery type gas turbine plant of this embodiment, the temperature drop of the working medium mainly composed of carbon dioxide is about 200 ° C. smaller than that of dry air. Further, the exhaust heat retained by the exhaust gas 46 after passing through the regenerative heat exchanger 4 is recovered in the hot water 71 by the feed water heater 5, so that the latent heat of evaporation lost by the hot water 71 supplied to the humidifier 7 is replenished. It can be used and efficient heat recovery becomes possible.

  Furthermore, in this embodiment, since it is not necessary to install a steam turbine system that requires equipment costs to recover the exhaust heat retained by the exhaust gas, the equipment costs of the gas turbine plant can be reduced while maintaining high thermal efficiency.

  Further, in the water recovery device 6, the temperature of the exhaust gas 48 discharged from the water recovery device 6 can be lowered to near the atmospheric temperature by increasing the flow rate of the condensed water 78 serving as cooling water sprayed on the exhaust gas 47. As a result, the temperature of the working fluid 41 at the inlet of the compressor 1 can be lowered, and the compression power of the compressor 1 can be reduced.

  Further, by adopting a method of directly cooling by spraying water droplets as a water recovery method of the water recovery device 6, contact between the cooling water and the working fluid can be achieved with a simpler configuration than using a condenser used in a steam turbine or the like. It becomes possible to increase the area and cool down.

  According to an embodiment of the present invention, in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process. A carbon dioxide recovery type gas turbine plant with improved overall efficiency can be realized.

  Next, a carbon dioxide recovery type gas turbine plant according to a second embodiment of the present invention will be described with reference to FIG.

  The carbon dioxide recovery type gas turbine plant of the second embodiment shown in FIG. 2 has the same basic configuration as the carbon dioxide recovery type gas turbine plant of the first embodiment shown in FIG. Will be omitted, and only different configurations will be described below.

  In FIG. 2, in the carbon dioxide recovery type gas turbine plant of the present embodiment, the entire amount of the exhaust gas 48 mainly composed of carbon dioxide after passing through the water recovery device 6 flows into the compressor 1 as the working fluid 41. The cooler 13 configured to cool the working fluid 42 is installed in a path for supplying the working fluid 42 after passing through the compressor 1 to the humidifier 7.

  In the carbon dioxide recovery type gas turbine plant of this embodiment, the extraction passage 14 for extracting a part of the working fluid 42 mainly composed of carbon dioxide after being discharged from the compressor 1 and cooled by the cooler 13 is provided. A condenser 11 is provided that branches from between the cooler 13 and the humidifier 7 and further cools the working fluid 42 mainly composed of carbon dioxide guided through the extraction passage 14 to condense moisture. A carbon dioxide separator 100 is installed, and the carbon dioxide separator 100 condenses and separates moisture from the exhaust gas 42 to recover high-pressure carbon dioxide. Further, the water 75 generated in the condenser 11 is supplied to the bottom of the humidifier 7.

  Next, the specific operation of the carbon dioxide recovery type gas turbine plant of the present embodiment will be described. In FIG. 2, the working fluid 41 mainly composed of carbon dioxide before the inlet of the compressor 1 is The working fluid 42 is compressed to a pressure ratio of 50. The pressure of the working fluid 42 at this time is about 5 MPa, the temperature is about 410 ° C., and the composition is about 97% carbon dioxide and about 3% water vapor by mass flow ratio.

  The working fluid 42 compressed by the compressor 1 flows into the cooler 13 and is cooled to about 320 ° C. A part of the working fluid 42 cooled through the cooler 13 flows into the condenser 11 of the carbon dioxide separator 100 via the extraction path 14.

  In the process of cooling the working fluid 42 mainly composed of carbon dioxide flowing into the condenser 11, when the temperature falls to the saturation temperature of the water vapor contained in the working fluid 42, the water vapor is condensed and separated into water 75. And is supplied to the humidifier 7 as makeup water.

  Eventually, when the working fluid 42 is cooled to 30 ° C., the saturation pressure of water is about 4 kPa and the ratio of water vapor to carbon dioxide drops to less than 0.1 percent. In this way, the high-pressure carbon dioxide gas whose purity has been increased by the carbon dioxide separator 100 is sent to a carbon dioxide treatment facility (not shown) and recovered as liquefied carbon dioxide gas or high-pressure carbon dioxide gas. When producing liquefied carbon dioxide gas, it is necessary to cool the carbon dioxide gas in a high pressure state, so if high-pressure carbon dioxide gas can be obtained as in this embodiment, liquefied carbon dioxide gas can be produced with less power. It is possible to improve the efficiency of the entire system.

  The specific operation of the water system in the carbon dioxide recovery type gas turbine plant of the present embodiment will be described. A part of the water 74 exchanged with the working fluid 42 by the cooler 13 and supplied to the humidifier 7 is supplied by the pump 61. The pressure is increased and the water 79 is supplied again to the cooler 13, and the temperature is raised to about 200 ° C. by exchanging heat with the working fluid 42 in the cooler 13.

  The water 74 heated by the cooler 13 is supplied to the humidifier 7 and used to cool the working fluid 43 flowing into the reheat heat exchanger 4 by the humidifier 7. Further, as described above, the water 75 separated from the working fluid 42 by the condenser 11 may be supplied to the humidifier 7 and reused as make-up water, or may be compressed by returning to the inlet of the compressor 1 or midway. You may spray in the machine 1.

  In the carbon dioxide recovery type gas turbine plant of the present embodiment, a part of the high-pressure working fluid 42 mainly composed of carbon dioxide obtained by compressing the working fluid 41 with the compressor 1 is extracted after passing through the cooler 13. The carbon dioxide compressor 10 installed separately in the carbon dioxide separator 100 of 1st Example shown in 1 becomes unnecessary, and installation cost can be reduced.

  Further, since the water is condensed by the condenser 11 after the working fluid 42 is cooled by the cooler 13, the temperature of the working fluid 42 is low, and the flow rate of the cooling water for cooling supplied to the condenser 11 is reduced. It is possible.

  Further, since the heat recovered by heat exchange with the working fluid 42 in the cooler 13 is recovered in the form of heating the water 74 sprayed on the humidifier 7, it is possible to efficiently recover the heat. Then, the water 75 generated in the condenser 11 is returned to the compressor 1 as a part of the humidifier 7 or the working fluid 41, so that the humidification amount of the humidifier 7 is increased in the former case, and the compressor in the latter case. 1 reduction in compression power can be expected.

  By the way, in the carbon dioxide recovery type gas turbine plant of the present embodiment, the working fluid 42 compressed by the compressor 1 and discharged from the compressor 1 is humidified by the humidifier 7 as in the first embodiment. It is necessary to design the flow rate of the working fluid in the turbine 3 to be relatively higher than that in the compressor 1 as compared with the case of the combination of the compressor and the turbine. However, in the carbon dioxide recovery type gas turbine plant of the present embodiment, a part of the working fluid 42 mainly composed of carbon dioxide is extracted from the middle between the compressor 1 outlet and the humidifier 7 inlet. , The flow rates of the working media 43 and 44 flowing into the turbine 3 through the regenerative heat exchanger 4 are reduced. As a result, there is an advantage that the flow rate balance between the compressor 1 and the turbine 3 is improved, and the reliability including the thrust bearing is improved.

  In addition, it is considered that the decrease in turbine work due to the extraction of the high-pressure working fluid 42 is almost offset by the reduction in compression work in the carbon dioxide separator 100.

  According to an embodiment of the present invention, in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process. A carbon dioxide recovery type gas turbine plant with improved overall efficiency can be realized.

  Next, a carbon dioxide recovery type gas turbine plant according to a third embodiment of the present invention will be described with reference to FIG.

  The basic configuration of the carbon dioxide recovery type gas turbine plant of the third embodiment shown in FIG. 3 is the same as that of the carbon dioxide recovery type gas turbine plant of the second embodiment shown in FIG. Will be omitted, and only different configurations will be described below.

  In FIG. 3, in the carbon dioxide recovery type gas turbine plant of this embodiment, the working fluid mainly composed of carbon dioxide discharged from the compressor 1, cooled by the cooler 13, and humidified by the humidifier 7. In this configuration, an extraction passage 14 for extracting a part of 43 is arranged so as to branch from between the humidifier 7 and the regenerative heat exchanger 4.

  In the case of the present embodiment, since a large amount of water vapor is contained in the working fluid 43 extracted by humidification in the humidifier 7, the working fluid 43 guided through the extraction passage 14 is transferred to the condenser 11 of the carbon dioxide separator 100. More water 75 can be obtained by condensing at. Therefore, since much of the obtained water 75 can be sprayed into the compressor 1, the compression power of the compressor 1 can be further reduced.

  According to an embodiment of the present invention, in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process. A carbon dioxide recovery type gas turbine plant with improved overall efficiency can be realized.

  Next, a carbon dioxide recovery type gas turbine plant according to a fourth embodiment of the present invention will be described with reference to FIG.

  The carbon dioxide recovery type gas turbine plant of the fourth embodiment shown in FIG. 4 has the same basic configuration as the carbon dioxide recovery type gas turbine plant of the second embodiment shown in FIG. Will be omitted, and only different configurations will be described below.

  In FIG. 4, in the carbon dioxide recovery type gas turbine plant of the present embodiment, the compressor 1 is divided into a low-pressure compressor 15 and a high-pressure compressor 16, and includes a cooler 13, a bleed passage 14, and a condenser. The carbon dioxide separator 100 having 11 is disposed between the low-pressure compressor 15 and the high-pressure compressor 16.

  In the carbon dioxide recovery type gas turbine plant of this embodiment shown in FIG. 4, a working fluid 41 mainly composed of carbon dioxide flows into the low-pressure compressor 15, and the working fluid 41 is supplied to the predetermined pressure by the low-pressure compressor 15. The pressure is compressed to a pressure ratio of 50 to obtain a high-pressure working fluid 42. The pressure of the working fluid 42 at this time is about 5 MPa, the temperature is about 410 ° C., and the composition is about 97% carbon dioxide and about 3% water vapor by mass flow ratio.

  The pressurized working fluid 42 that has passed through the low-pressure compressor 15 flows into the cooler 13 and is cooled to about 320 ° C. A part of the working fluid 42 cooled by passing through the cooler 13 passes through the extraction passage 14 arranged to be branched from between the low-pressure compressor 15 and the high-pressure compressor 16. It flows into the condenser 11.

  In the process of cooling the working fluid 42 mainly composed of carbon dioxide flowing into the condenser 11, the water vapor in the working fluid 42 is condensed and separated, discharged as water 75, and supplied to the humidifier 7. Supplied as water.

  Eventually, when the working fluid 42 is cooled to 30 ° C., the saturation pressure of water is about 4 kPa and the ratio of water vapor to carbon dioxide is reduced to less than 0.1 percent. In this way, the high-pressure carbon dioxide gas whose purity has been increased by the carbon dioxide separator 100 is sent to a carbon dioxide treatment facility (not shown) and recovered as liquefied carbon dioxide gas or high-pressure carbon dioxide gas. When producing liquefied carbon dioxide gas, it is necessary to cool the carbon dioxide gas in a high pressure state, so if high-pressure carbon dioxide gas can be obtained as in this embodiment, liquefied carbon dioxide gas can be produced with less power. Is possible.

  Further, another part of the working fluid 42 compressed by the low-pressure compressor 15 and cooled by passing through the cooler 13 flows into the high-pressure compressor 16, and the predetermined pressure ratio 1. Compressed to 5, becomes a working fluid 42 ′ of about 370 ° C. and flows into the humidifier 7.

  The working fluid 42 ′ humidified by the humidifier 7 is transferred from the humidifier 7 to the reheat heat exchanger 4 as the working fluid 43 in the same manner as the working fluid 42 humidified by the humidifier 7 of the second embodiment. The working fluid 43 that flows in and is heated by the reheat heat exchanger 4 is supplied to the combustor 2 to become the working fluid 44.

  Next, a specific operation of the water system in the carbon dioxide recovery type gas turbine plant of the present embodiment will be described. A part of the water 74 supplied to the humidifier 7 by exchanging heat with the working fluid 42 in the cooler 13 is pumped. The pressure is increased by 61 and supplied again as water 79 to the cooler 13, and the temperature is raised to about 200 ° C. by exchanging heat with the working fluid 41 ′ in the cooler 13.

  The water 74 heated by the cooler 13 is supplied to the humidifier 7 and is used to cool the working fluid 43 flowing into the reheat heat exchanger 4 by the humidifier 7.

  The cooling water heated by the cooler 13 and the working fluid 42 ′ at the outlet of the high-pressure compressor 16 may be heat-exchanged before being supplied to the humidifier 7.

  Further, the water 75 separated from the working fluid 42 by the condenser 11 may be supplied to the humidifier 7 to be reused as make-up water, or although not shown, it is returned to the inlet of the low-pressure compressor 15 or in the middle. Then, it may be sprayed into the low-pressure compressor 15.

  In the carbon dioxide recovery type gas turbine plant of the present embodiment, the separate carbon dioxide compressor 10 becomes unnecessary as in the second embodiment, and the equipment cost can be reduced.

  Further, since the water is condensed by the condenser 11 after the working fluid 42 is cooled by the cooler 13, the temperature of the working fluid 42 is low, and the flow rate of the cooling water for cooling supplied to the condenser 11 is reduced. It is possible.

  Further, since the heat recovered by heat exchange with the working fluid 42 in the cooler 13 is recovered in the form of heating of the water 74 supplied to the humidifier 7, it is possible to efficiently recover the heat. The water 75 generated in the condenser 11 is returned to the low-pressure compressor 15 as a part of the humidifier 7 or the working fluid 41, so that the humidification amount of the humidifier 7 is increased in the former case, and the low-pressure in the latter case. Reduction of the compression power of the compressor 15 can be expected.

  Furthermore, since the cooler 13 installed between the low pressure compressor 15 and the high pressure compressor 16 functions as an intermediate cooler, the compression outlet temperature of the high pressure compressor 16 is reduced while reducing the compression power of the high pressure compressor 16. Can be lowered.

  According to an embodiment of the present invention, in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process. A carbon dioxide recovery type gas turbine plant with improved overall efficiency can be realized.

  Next, a carbon dioxide recovery type gas turbine plant according to a fifth embodiment of the present invention will be described with reference to FIG.

  The basic configuration of the carbon dioxide recovery type gas turbine plant of the fifth embodiment shown in FIG. 5 is the same as that of the carbon dioxide recovery type gas turbine plant of the fourth embodiment shown in FIG. Will be omitted, and only different configurations will be described below.

  In FIG. 5, the carbon dioxide recovery type gas turbine plant of the present embodiment is configured by dividing the compressor 1 into a low-pressure compressor 15 and a high-pressure compressor 16 as in the fourth embodiment. The carbon dioxide separator 100 having the extraction path 14 and the condenser 11 is configured to be disposed between the high-pressure compressor 16 and the humidifier 7.

  Further, spray coolers 17 and 18 for spraying water 77 are respectively installed at the inlets of the low-pressure compressor 15 and the high-pressure compressor 16, and a water recovery device is used as the water 77 supplied to the spray coolers 17 and 18. Water 76 branched from the circulating water 78 circulating between the heat exchanger 6 and the cooler 63 and water 75 condensed in the condenser 11 of the carbon dioxide separator 100 are used.

  In the carbon dioxide recovery type gas turbine plant of the present embodiment shown in FIG. 5, a spray cooler is applied to the working fluid 41 mainly composed of carbon dioxide flowing into the low pressure compressor 15 at the inlet of the low pressure compressor 15. Water 77 is sprayed from 17.

  The amount of water 77 sprayed from the spray cooler 17 is assumed to be about 1% of the inlet mass flow rate of the low-pressure compressor 15, but the amount of spray is within a range that does not cause unstable phenomena such as surging of the compressor. It is not a problem even if 1% or more.

  The water droplet sprayed from the spray cooler 17 completes evaporation at the inlet of the low-pressure compressor 15 or inside the low-pressure compressor 15, and flows into the high-pressure compressor 16 as a working fluid 41 '.

  When the working fluid 41 ′ flows into the high-pressure compressor 16, about 1% of water at the inlet mass flow rate of the high-pressure compressor 15 is further sprayed from the spray cooler 18 at the high-pressure compressor 16 inlet. Further, as with the low pressure compressor 15, the spray amount of the water 77 is not limited to 1% or more as long as it does not cause an unstable phenomenon such as surging.

  By the compression by the low-pressure compressor 15 and the high-pressure compressor 16, the working fluid 41 is finally compressed to a predetermined pressure ratio 50 to become the working fluid 42. At this time, when the temperature of the working fluid 42 at the outlet of the high pressure compressor 16 is cooled to about 370 ° C. by the spraying of water 77, and the compression power of the low pressure compressor 15 and the high pressure compressor 16 is reduced by about 10%. Assumed.

  The working fluid 42 that has passed through the high-pressure compressor 16 flows into the cooler 13 and is further cooled to about 280 ° C. A part of the cooled working fluid 42 flows into the condenser 11 of the carbon dioxide separator 100 via the extraction path 14 that is branched from the high-pressure compressor 16 and the humidifier 7.

  In the process of cooling the working fluid 42 mainly composed of carbon dioxide flowing into the condenser 11, the water vapor in the working fluid 42 is condensed and separated, discharged as water 75, and supplied to the humidifier 7. Supplied as water.

  Eventually, when the working fluid 42 is cooled to 30 ° C., the saturation pressure of water is about 4 kPa and the ratio of water vapor to carbon dioxide is reduced to less than 0.1 percent. In this way, the high-pressure carbon dioxide gas whose purity has been increased by the carbon dioxide separator 100 is sent to a carbon dioxide treatment facility (not shown) and recovered as liquefied carbon dioxide gas or high-pressure carbon dioxide gas. When producing liquefied carbon dioxide gas, it is necessary to cool the carbon dioxide gas in a high pressure state, so if high-pressure carbon dioxide gas can be obtained as in this embodiment, liquefied carbon dioxide gas can be produced with less power. It is possible to improve the efficiency of the entire system.

  Also in the carbon dioxide recovery type gas turbine plant of the present embodiment, the separate carbon dioxide compressor 10 becomes unnecessary as in the second embodiment, and the equipment cost can be reduced.

  Further, since the water is condensed by the condenser 11 after the working fluid 42 is cooled by the cooler 13, the temperature of the working fluid 42 is low, and the flow rate of the cooling water for cooling supplied to the condenser 11 is reduced. It is possible.

  Further, since the heat recovered by heat exchange with the working fluid 42 in the cooler 13 is recovered in the form of heating of the water 74 supplied to the humidifier 7, it is possible to efficiently recover the heat. The water 75 generated in the condenser 11 is sprayed from the spray coolers 17 and 18 to the respective inlets of the low-pressure compressor 15 and the high-pressure compressor 16 as water 77, so that the compression power of the low-pressure compressor 15 and the high-pressure compressor 16 is sprayed. Can be expected, and the effect of increasing the flow rate is increased. Therefore, it is possible to suppress the decrease in turbine work due to extraction while obtaining the effect of improving the flow rate balance.

  Here, in the carbon dioxide recovery type gas turbine plant of the present embodiment, the intake air cooling and the intermediate cooling are performed using the direct heat exchange type spray coolers 17 and 18, but if the cooling function is fulfilled, other equipment, for example, An indirect heat exchange type cooler may be used instead of the spray cooler. However, when an indirect heat exchange type cooler is used, the effect of increasing the flow rate of the working fluid is lost, and water generated in the condenser 11 of the carbon dioxide separator 100 cannot be used. The type gas turbine plant is considered to have more advantages.

  In the carbon dioxide recovery type gas turbine plant of the present embodiment, the spray coolers 17 and 18 are installed at the inlets of both the low pressure compressor 15 and the high pressure compressor 16, but the spray cooler is installed only in one of them. It is also possible to do.

  Further, in the carbon dioxide recovery type gas turbine plant of the second to fourth embodiments described above, the pressure of the working fluid extracted in the extraction passage 14 is small because the pressure ratio of the compressor is small, and is sent to a carbon dioxide treatment facility (not shown). In the case where the pressure is lower than that required, a carbon dioxide compressor for compressing the working fluid is separately required. However, even in this case, there is an advantage that the pressure ratio of the compressor required for compressing the working fluid is smaller than that in the first embodiment.

  According to an embodiment of the present invention, in a closed cycle gas turbine plant driven by a working fluid containing carbon dioxide as a main component, heat recovery is efficiently performed from the exhaust gas of the gas turbine in consideration of the carbon dioxide liquefaction process. A carbon dioxide recovery type gas turbine plant with improved overall efficiency can be realized.

  The present invention can be applied to a carbon dioxide recovery type gas turbine plant, and particularly includes a compressor that compresses the working fluid with carbon dioxide as a main component of the working fluid, and a combustor that performs oxyfuel combustion. It is applicable to a carbon dioxide recovery type gas turbine plant in which at least a part forms a closed cycle.

  1: compressor, 2: combustor, 3: turbine, 4: heat exchanger, 5: feed water heater, 6: water recovery device, 7: humidifier, 9: generator, 10: carbon dioxide compressor, 11 : Condenser, 12: Recirculation path, 13, 63: Cooler, 14: Extraction path, 15: Low pressure compressor, 16: High pressure compressor, 17, 18: Spray cooler, 41-44: Working fluid, 41 ', 42': Working fluid, 45-48: Exhaust gas, 61, 62: Pump, 71: Water, 72: Condensed water, 73, 74, 75: Water, 78: Circulating water, 81: Fuel, 82: Oxygen, 100: Carbon dioxide separator.

Claims (9)

A compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies the working fluid compressed by the compressor, and a mixture of oxygen and fuel in the working fluid humidified by the humidifier Heat exchange between the combustor to be combusted, the turbine driven by the exhaust gas mainly composed of carbon dioxide generated by the combustor, and the exhaust fluid discharged from the turbine and the working fluid that has passed through the humidifier A regenerative heat exchanger, and a water recovery device for recovering moisture in the exhaust gas by cooling the exhaust gas after passing through the regenerative heat exchanger,
A bleed path for taking out a part of the exhaust gas mainly composed of carbon dioxide after branching from the downstream side of the water recovery device and passing through the water recovery device is disposed,
Installing a separation device for separating carbon dioxide of the exhaust gas guided through the extraction path;
A carbon dioxide recovery type gas turbine having an exhaust gas path branched from the downstream side of the water recovery device and through which the remaining exhaust gas after passing through the water recovery device flows again into the compressor inlet plant. A compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies the working fluid compressed by the compressor, and a mixture of oxygen and fuel in the working fluid humidified by the humidifier Heat exchange between the combustor to be combusted, the turbine driven by the exhaust gas mainly composed of carbon dioxide generated by the combustor, and the exhaust fluid discharged from the turbine and the working fluid that has passed through the humidifier A regenerative heat exchanger, and a water recovery device for recovering moisture in the exhaust gas by cooling the exhaust gas after passing through the regenerative heat exchanger,
A cooler that cools a working fluid mainly composed of carbon dioxide that passes through the compressor and is supplied to the humidifier between the compressor and the humidifier;
A bleed path for taking out a part of the cooled working fluid after branching between the cooler and the humidifier and passing through the cooler;
Installing a separation device for separating carbon dioxide of the working fluid guided through the extraction path;
A carbon dioxide recovery type gas turbine plant characterized in that an exhaust gas path is provided for allowing the exhaust gas after passing through the water recovery device to flow again into the compressor inlet from the downstream side of the water recovery device. A compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies the working fluid compressed by the compressor, and a mixture of oxygen and fuel in the working fluid humidified by the humidifier Heat exchange between the combustor to be combusted, the turbine driven by the exhaust gas mainly composed of carbon dioxide generated by the combustor, and the exhaust fluid discharged from the turbine and the working fluid that has passed through the humidifier A regenerative heat exchanger, and a water recovery device for recovering moisture in the exhaust gas by cooling the exhaust gas after passing through the regenerative heat exchanger,
A cooler that cools a working fluid mainly composed of carbon dioxide that passes through the compressor and is supplied to the humidifier between the compressor and the humidifier;
A bleed passage for branching out from the humidifier and the regenerative heat exchanger and taking out a part of the humidified working fluid after passing through the humidifier;
Installing a separation device for separating carbon dioxide of the working fluid guided through the extraction path;
A carbon dioxide recovery type gas turbine plant characterized in that an exhaust gas path is provided for allowing the exhaust gas after passing through the water recovery device to flow again into the compressor inlet from the downstream side of the water recovery device. A compressor that compresses a working fluid mainly composed of carbon dioxide, a humidifier that humidifies the working fluid compressed by the compressor, and a mixture of oxygen and fuel in the working fluid humidified by the humidifier Heat exchange between the combustor to be combusted, the turbine driven by the exhaust gas mainly composed of carbon dioxide generated by the combustor, and the exhaust fluid discharged from the turbine and the working fluid that has passed through the humidifier A regenerative heat exchanger, and a water recovery device for recovering moisture in the exhaust gas by cooling the exhaust gas after passing through the regenerative heat exchanger,
The compressor is composed of a low-pressure compressor and a high-pressure compressor that further compresses the working fluid compressed by the low-pressure compressor,
A cooler for cooling the working fluid between the low pressure compressor and the high pressure compressor or between the high pressure compressor and the humidifier;
A part of the cooled working fluid after passing through the cooler after branching between the cooler and the high pressure compressor or between the high pressure compressor and the humidifier or passing through the high pressure compressor Arranging a bleed passage for extracting a part of the cooled working fluid afterwards,
Installing a separation device for separating carbon dioxide of the working fluid guided through the extraction path;
Carbon dioxide capture moth star bottle plant, characterized in that the exhaust gas after passing through the water recovery apparatus from the downstream side is disposed a path of the exhaust gas to flow back to the compressor inlet of the water collecting device. In the carbon dioxide recovery type gas turbine plant according to any one of claims 1 to 4,
The water recovery device sprays water on the exhaust gas to cool it, and a part of the water in the exhaust gas condensed by cooling is supplied from the water recovery device to the humidifier as humidifying water. Carbon dioxide recovery type gas turbine plant. In the carbon dioxide recovery type gas turbine plant according to claim 1 ,
The separation apparatus includes a carbon dioxide compressor that compresses exhaust gas mainly composed of carbon dioxide, and a condenser that condenses and separates moisture contained in the compressed exhaust gas. Recovery type gas turbine plant. In the carbon dioxide recovery type gas turbine plant according to any one of claims 1 to 4,
Installed between the regenerative heat exchanger and the water recovery device is a feed water heater that heats water by exchanging heat with the exhaust gas after passing through the regenerative heat exchanger, and the water heated by the feed water heater is A carbon dioxide recovery type gas turbine plant configured to be supplied to a humidifier as water for humidification. In the carbon dioxide recovery type gas turbine plant according to any one of claims 2 to 4,
The cooler is a cooler that cools the working fluid by exchanging heat generated in the humidifier with the working fluid that has passed through the compressor, and the water used for cooling by the cooler is supplied to the humidifier. A carbon dioxide recovery type gas turbine plant, which is supplied again as water for humidification. In the carbon dioxide recovery type gas turbine plant according to claim 4,
A spray cooler that sprays water on the working fluid is installed on the inlet side of the low-pressure compressor or between the low-pressure compressor and the high-pressure compressor, and the spray cooler includes the water recovery device or the separation device. The carbon dioxide recovery type gas turbine plant is configured to supply water generated in the condenser as water for spraying.

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