JP2020041449A - Solar heat power generation facility - Google Patents

Abstract

To generate steam to be fed to a steam turbine and stabilize a temperature of the steam even if there is no sunlight.SOLUTION: A solar heat power generation facility comprises: a steam generator 25 for generating steam by using solar heat; a steam turbine 30; a main steam line 65 for guiding the steam from the steam generator 25 to the steam turbine 30; a condenser 55; a water supply line 63 for guiding water in the condenser 55 to the steam generator 25; a plurality of extraction lines 67 for extracting the steam from the steam turbine 30; heat accumulators 40 provided for the plurality of extraction lines 67 respectively, and for storing heat of the steam; an auxiliary water supply line 64 branching from the water supply line 63, and connected to one accumulator out of the plurality of heat accumulators 40; a connection line 69 for connecting the plurality of heat accumulators 40 in series, and an auxiliary main steam line 66 for connecting the other heat accumulator out of the plurality of heat accumulators 40 and the main steam line 65.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar thermal power generation facility that generates power using thermal energy obtained from sunlight.

  In recent years, as environmentally friendly clean energy, equipment utilizing thermal energy obtained by condensing sunlight has been actively developed.

  As an example of such a facility, for example, there is a solar thermal power generation facility described in Patent Document 1 below. This solar thermal power generation equipment includes a plurality of heat receivers that receive water and heat water by receiving sunlight, a steam turbine driven by steam, a generator that generates power by driving the steam turbine, and steam that is exhausted from the steam turbine into water. It includes a condenser for returning, a water supply line for returning water in the condenser to the heat receiver, and a water supply pump provided in the water supply line. In this solar thermal power generation facility, the water from the feedwater pump is gradually heated to steam while passing through the plurality of heat receivers. This steam is supplied to a steam turbine. Therefore, in this solar thermal power generation facility, the plurality of heat receivers constitute a steam generator that generates steam using sunlight.

  This solar thermal power generation equipment furthermore, in order to be able to generate power even when a plurality of heat receivers are not receiving sunlight, a high-temperature heat storage tank, a medium-temperature heat storage tank, a low-temperature heat storage tank, a high-temperature heat exchanger, A medium-temperature heat exchanger and a low-temperature heat exchanger are provided.

  In this solar thermal power generation facility, a heat storage operation is performed when a plurality of heat receivers receive sunlight. In this solar thermal power generation facility, during a heat storage operation, steam from a plurality of heat receivers is sent to a high-temperature heat exchanger. The high-temperature heat exchanger exchanges heat between the steam and the heat storage liquid in the high-temperature heat storage tank, and heats the heat storage liquid while cooling the steam. The steam cooled by the high-temperature heat exchanger is sent to the medium-temperature heat exchanger. The heat exchange between the steam and the heat storage liquid in the medium temperature heat storage tank is performed by the medium temperature heat exchanger, and the heat storage liquid is heated while the steam is cooled to become water. Water from the medium temperature heat exchanger is sent to the low temperature heat exchanger. In this low-temperature heat exchanger, heat exchanges water with the heat storage liquid in the low-temperature heat storage tank, so that the heat storage liquid is heated and the water is cooled. As a result of this heat storage operation, the temperature of the heat storage liquid in each of the plurality of heat storage tanks is changed in the order of the temperature of the heat storage liquid in the low-temperature heat storage tank, the temperature of the heat storage liquid in the medium-temperature heat storage tank, and the temperature of the heat storage liquid in the high-temperature heat storage tank. Get higher.

  In this solar thermal power generation facility, when a plurality of heat receivers do not receive sunlight, heat is radiated. In this solar thermal power generation facility, at the time of the heat radiation operation, water from the water supply pump is sent to the low temperature heat exchanger. In this low-temperature heat exchanger, water from the water supply pump exchanges heat with the heat storage body in the low-temperature heat storage tank, and the water is heated. The water heated by the low-temperature heat exchanger is sent to the medium-temperature heat exchanger. In this medium temperature heat exchanger, water from the medium temperature heat exchanger and heat storage liquid in the medium temperature heat storage tank exchange heat, and this water becomes saturated steam. This saturated steam is sent to a high-temperature heat exchanger. In the high-temperature heat exchanger, the saturated steam from the medium-temperature heat exchanger exchanges heat with the heat storage liquid in the high-temperature heat storage tank, and the saturated steam becomes superheated steam. This superheated steam is sent to the steam turbine and drives the steam turbine.

JP 2014092086 A

  In the solar thermal power generation facility described in Patent Literature 1, steam can be generated by heat stored in the heat storage liquid in each heat storage tank even when a plurality of heat receivers do not receive sunlight. The steam turbine can be driven. Further, in this solar thermal power generation facility, since the water is sequentially heated with the heat storage liquid having different temperatures for each of the plurality of heat storage tanks to generate steam, the water is heated with the heat storage liquid in one heat storage tank to generate steam. The heat stored in the heat storage liquid can be used more efficiently than in the case.

  By the way, in this solar thermal power generation equipment, a plurality of heat exchangers for exchanging heat between the steam and the heat storage liquid with respect to the steam from the plurality of heat receivers are connected in series. For this reason, the temperature of the steam from the plurality of heat receivers gradually decreases as the steam sequentially flows through the plurality of heat exchangers. If the heat storage operation is performed when the temperature of the heat storage liquid in each heat storage tank is low, when the heat from the plurality of heat receivers and the heat storage liquid in the high-temperature heat storage tank are exchanged by the high-temperature heat exchanger, The temperature of the steam from the heat receiver greatly decreases. For this reason, even if this steam exchanges heat with the heat storage liquid in the medium temperature heat storage tank in the medium temperature heat exchanger, the temperature of the heat storage liquid does not rise so much. That is, in this solar thermal power generation facility, the temperature of the heat storage liquid in each heat storage tank after the heat storage operation greatly changes according to the temperature of the heat storage liquid in each heat storage tank before the heat storage operation.

  Therefore, in this solar thermal power generation facility, there is a problem that the temperature of the steam sent to the steam turbine during the heat radiation operation changes according to the temperature of the heat storage liquid in each heat storage tank before the heat storage operation.

  Therefore, an object of the present invention is to provide a solar thermal power generation facility that can generate steam to be sent to a steam turbine even when sunlight is not emitted and can stabilize the temperature of the steam. .

One embodiment of a solar thermal power generation facility according to the invention for achieving the above object,
A steam generator that generates steam using solar heat, a steam turbine driven by the steam, a main steam line that guides steam from the steam generator to the steam turbine, and a generator that generates power by driving the steam turbine A condenser for returning steam exhausted from the steam turbine to water, a water supply line connecting the condenser and the steam generator, and a plurality of extraction lines for extracting steam from the steam turbine, A regenerator provided for each of the plurality of bleed lines and having a regenerator for storing heat of steam, and an auxiliary water supply line branched from the water supply line and connected to one of the plurality of regenerators And a connection line that connects a plurality of the regenerators in series so that water from the auxiliary water supply line flows to the plurality of the regenerators sequentially, and a plurality of the regenerators, excluding the one regenerator. Accumulation of Vessel and provided with an auxiliary main steam line for connecting the main steam line. The steam turbine has a steam turbine rotor that rotates around an axis, and a steam turbine casing that covers the steam turbine rotor. The plurality of extraction lines are connected to different positions in the steam turbine casing in an axial direction in which the axis extends, and extract steam having different temperatures in the steam turbine casing. The one regenerator is a lowest-temperature regenerator connected to a lowest-temperature bleed line through which the lowest-temperature steam flows, among the plurality of bleed lines. The other regenerator is a highest-temperature regenerator connected to the highest-temperature bleed line through which the hottest steam flows among the plurality of bleed lines.

  In this aspect, when sunlight reaches the area where the solar thermal power generation facility is installed, the steam generator generates steam. The steam turbine is driven by steam from the steam generator. At this time, a part of the steam in the steam turbine casing is extracted from the extraction lines connected to different positions in the axial direction, and flows into the heat storage units provided for the plurality of extraction lines. In each regenerator, the regenerator is heated by heat exchange with the extracted steam. That is, heat is stored in the heat storage body.

  The temperature range of steam flowing into the steam turbine for driving the steam turbine is within a certain range. The temperature of the extracted steam extracted from the steam turbine via each extraction line differs depending on the extraction position of the extracted steam. However, the temperature range of extracted steam extracted from the steam turbine via each extraction line is within a certain range for each extraction line. For this reason, the temperature range after the heat storage of the heat storage body of the heat storage device connected to each extraction line also falls within a certain range for each heat storage device.

  When sunlight stops reaching the area where the solar thermal power generation equipment is installed, the pressure and temperature of the steam from the steam generator gradually decrease. At this time, when the water from the condenser is sent to a plurality of heat accumulators via the auxiliary water supply line, the water is heated by the heat accumulators for each of the plurality of heat accumulators in the process of sequentially passing the water through the plurality of heat accumulators. Becomes steam. The steam flows into the steam turbine via the auxiliary main steam line and the main steam line, and drives the steam turbine. Therefore, in this aspect, even if sunlight does not reach the area where the solar thermal power generation equipment is installed, the steam turbine can be driven.

  In this aspect, as described above, the temperature range after the heat storage of the heat storage body of the heat storage device connected to each bleed line is within a certain range for each heat storage device. For this reason, when the heat from the heat storage bodies of the plurality of heat storage units is radiated to generate water to be heated to generate steam to be sent to the steam turbine, the temperature range of the steam falls within a certain range. Therefore, for example, even when the steam turbine is continuously driven after the sunlight no longer reaches the area where the solar thermal power generation equipment is installed, the steam turbine can be stably operated.

  Here, in the solar thermal power generation facility of the above aspect, a thermometer that detects a temperature of the heat storage body for each of the plurality of heat storage devices, and an extraction valve provided in the extraction line for each of the plurality of heat storage devices, May be provided. In this case, each of the bleed valves for each of the plurality of regenerators corresponds to steam flowing through the bleed line provided with the bleed valve in accordance with the temperature of the heat storage body of the regenerator corresponding to the bleed valve. Adjust the flow rate.

  In this aspect, the flow rate of the steam flowing through the bleed line is adjusted by the bleed valve in accordance with the temperature of the heat storage body of the heat storage device. For this reason, in this aspect, the temperature of the heat storage body can be accurately managed.

  In the solar thermal power generation facility of the aspect including the bleed valve, each of the bleed valves for each of the plurality of regenerators has a temperature of the heat storage body of the regenerator corresponding to the bleed valve equal to or higher than a predetermined temperature. , Closes.

  In this aspect, when the temperature of the heat storage body becomes equal to or higher than the predetermined temperature and the heat storage is completed, the bleed valve is closed, and the bleed steam from the bleed line is not sent to the heat storage device. For this reason, in this aspect, when the heat storage of the heat storage body is completed, extraction of air from the steam turbine can be suppressed, and the output of the steam turbine can be increased.

  The thermal power generation equipment according to any one of the above aspects, including the extraction valve, may include a state quantity detector that detects a state quantity of steam flowing through the main steam line. In this case, each of the bleed valves for each of the plurality of heat accumulators is, in accordance with the state quantity of the steam detected by the state quantity detector, the flow rate of steam flowing through the bleed line provided with the bleed valve. Adjust

  In this aspect, even if the steam is sent from the steam turbine to the regenerator via the extraction line, if the state quantity of the steam detected by the state quantity detector satisfies the condition necessary for driving the steam turbine, the steam is extracted from the steam turbine. Steam can be sent to the regenerator via the line.

  In the solar thermal power generation facility according to any one of the above aspects, the plurality of heat accumulators may each include a heat storage case and a plurality of solid heat storage materials as the heat storage body, which are disposed in the heat storage case. Good.

  When a solid heat storage material is used as the heat storage body, the configuration of the heat storage case becomes simpler than when a heat storage liquid or a latent heat storage material is used. For this reason, in this aspect, facility costs can be reduced.

  Further, in the solar thermal power generation equipment according to any of the above aspects, the steam generator may include a heat receiver that receives solar heat.

  Further, in the solar thermal power generation equipment according to any one of the above aspects, a compressor that compresses a working medium to generate a compression medium, a heat receiver that receives sunlight and heats the compression medium, and is heated by the heat receiver. A turbine driven by the compression medium, and an exhaust heat recovery boiler that generates steam by the working medium exhausted from the turbine. In this case, the steam generator has the heat receiver and the exhaust heat recovery boiler.

  In the solar thermal power generation equipment according to any one of the aspects, including the waste heat recovery boiler, the working medium exhausted from the turbine heats the compression medium from the compressor, and the heated compression medium is supplied to the heat receiver. May be further provided.

  In this aspect, even when the amount of sunshine is small, the temperature of the working medium sent to the turbine can be increased, and the driving amount of the turbine can be increased.

  The solar thermal power generation equipment of any aspect including the exhaust heat recovery boiler may further include a medium circulation line that returns the working medium exhausted from the exhaust heat recovery boiler to the compressor.

  In this aspect, since the compressor sucks the working medium exhausted from the exhaust heat recovery boiler, the temperature of the working medium sucked by the compressor becomes higher than when the compressor sucks outside air as the working medium. Further, in this aspect, since the compressor sucks the working medium exhausted from the exhaust heat recovery boiler, the pressure of the working medium sucked by the compressor becomes higher than when the compressor sucks outside air as the working medium. Therefore, in this aspect, a higher temperature and higher pressure working medium can be supplied to the turbine than when the compressor sucks outside air as the working medium. For this reason, in this aspect, the output of the gas turbine can be higher than in the case where the compressor sucks outside air as the working medium.

  In the solar thermal power generation equipment according to any one of the aspects, including the heat receiver, a mirror that reflects sunlight, and a mirror driver that changes the direction of the reflector so that the sunlight reflected by the reflector faces the heat receiver. And a heliostat having the following.

  In the solar thermal power generation equipment of any of the above aspects, a main steam regenerator having a heat storage body for storing heat of steam, and a main steam regenerator that branches off from the main steam line and sends steam from the steam generator to the main steam regenerator And a leading heat storage main steam line 67x. In this case, the main steam regenerator is provided in the auxiliary main steam line and is connected to the highest temperature regenerator.

  In this embodiment, after the heat from the heat storage bodies of the plurality of heat storage units is radiated and the water is heated to generate steam, the steam can be further heated by the heat storage unit of the main steam storage unit. Therefore, the temperature of the steam sent to the steam turbine can be increased, and the output of the steam turbine can be increased.

  According to one embodiment of the present invention, even when sunlight is not emitted, steam to be sent to the steam turbine can be generated, and the temperature of the steam can be stabilized.

1 is an overall system diagram of a solar thermal power generation facility in one embodiment according to the present invention. FIG. 2 is a system diagram around a waste heat recovery boiler and a steam turbine of a solar thermal power generation facility in one embodiment according to the present invention. It is explanatory drawing which shows the state after starting a gas turbine in the solar thermal power generation equipment in one Embodiment which concerns on this invention, and before starting a steam turbine. It is explanatory drawing which shows the state when the steam from the waste-heat recovery boiler drives a steam turbine and the several heat storage accumulates heat in the solar thermal power generation equipment in one Embodiment which concerns on this invention. It is explanatory drawing which shows the state in which the steam generated by the heat stored in the several heat storage in the solar thermal power generation equipment in one Embodiment which concerns on this invention is driven only by this steam. It is a system diagram around the exhaust heat recovery boiler and steam turbine of the solar thermal power generation equipment in the modification of one embodiment concerning the present invention.

  Hereinafter, an embodiment of a solar thermal power generation facility according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the solar thermal power generation equipment of the present embodiment includes a compressor 11, a medium preheater 19, a heat receiver (part of a steam generator) 18, a turbine 14, a gas turbine generator 20, , A waste heat recovery boiler (part of a steam generator) 25, a steam turbine 30, a plurality of regenerators 40, a steam turbine generator 50, a condenser 55, a feedwater pump 56, and a plurality of heliostats 57 and a control device 90.

  The compressor 11 compresses the working medium to generate a compressed medium. The compressor 11 has a compressor rotor 12 that rotates around a GT axis Agt, and a compressor casing 13 that covers the compressor rotor 12.

The working medium of the present embodiment is a low-boiling medium having an evaporation temperature lower than that of the air. Examples of the low boiling point medium include CO ₂ and a medium used in an organic Rankine cycle. Examples of the medium used in the organic Rankine cycle include the following substances.
・ Organic halogen compounds such as trichloroethylene, tetrachloroethylene, monochlorobenzene, dichlorobenzene and perfluorodecalin ・ Alkanes such as butane, propane, pentane, hexane, heptane, octane and decane ・ Cycloalkanes such as cyclopentane and cyclohexane Aromatic compounds • Refrigerants such as R134a and R245fa,
.Combinations of the above

  The heat receiver 18 receives the sunlight R from the heliostat 57 and heats the compression medium.

  The turbine 14 is driven by the compression medium heated by the heat receiver 18. The turbine 14 includes a turbine rotor 15 that rotates around a GT axis Agt, and a turbine casing 16 that covers the turbine rotor 15.

  The gas turbine 10 includes the compressor 11, the heat receiver 18, and the turbine 14 described above. The turbine rotor 15 and the compressor rotor 12 are mechanically directly connected and integrally rotate to form a gas turbine rotor 17.

  The gas turbine generator 20 has a generator rotor 21 and a generator casing 22 that covers the generator rotor 21. The generator rotor 21 is mechanically connected to the gas turbine rotor 17.

  The medium preheater 19 heats the compression medium from the compressor 11 with the exhaust medium that is the working medium exhausted from the turbine 14. The above-described heat receiver 18 further heats the compressed medium heated by the medium preheater 19 and sends it to the turbine 14.

  The heliostat 57 includes a reflecting mirror 57a that reflects the sunlight R, a supporting leg 57b that supports the reflecting mirror 57a, and a mirror driving device 57c that directs the reflecting mirror 57a in a target direction.

  The exhaust heat recovery boiler 25 heats water with the exhaust medium exhausted from the medium preheater 19, and turns the water into steam.

  The steam turbine 30 is driven by steam from the exhaust heat recovery boiler 25. The steam turbine 30 has a steam turbine rotor 31 that rotates around the ST axis Ast, and a steam turbine casing 34 that covers the steam turbine rotor 31.

  The steam turbine generator 50 has a generator rotor 51 and a generator casing 52 that covers the generator rotor 51. The generator rotor 51 is mechanically connected to the steam turbine rotor 31.

  The condenser 55 is connected to a steam outlet 34o of the steam turbine casing 34. The condenser 55 cools the steam exhausted from the steam turbine 30 and returns the steam to water. The water supply pump 56 sends the water in the condenser 55 to the heat recovery steam generator 25.

  The solar thermal power generation equipment of the present embodiment further includes a compression medium line 60, a medium exhaust line 61, a medium circulation line 62, a water supply line 63, an auxiliary water supply line 64, a main steam line 65, an auxiliary main steam line 66, an extraction line 67, A steam recovery line 68 and a connection line 69 are provided.

  The compression medium line 60 connects the medium outlet 13 o of the compressor casing 13 and the medium inlet 16 i of the turbine casing 16. The medium preheater 19 and the heat receiver 18 are provided in the compression medium line 60 and heat the compression medium flowing through the compression medium line 60 as described above. The heat receiver 18 is provided on the turbine 14 side of the medium preheater 19 in the compression medium line 60.

  The medium exhaust line 61 connects the medium outlet 16o of the turbine casing 16 and the medium inlet 26i of the exhaust heat recovery boiler 25. The medium preheater 19 is provided in the medium exhaust line 61, and heats the compression medium by the exhaust medium flowing through the medium exhaust line 61 as described above.

  The medium circulation line 62 connects the medium outlet 26o of the exhaust heat recovery boiler 25 and the medium inlet 13i of the compressor casing 13.

  The main steam line 65 connects the steam outlet 29o of the exhaust heat recovery boiler 25 and the steam inlet 34i of the steam turbine casing 34. The water supply line 63 connects the condenser 55 and the water supply inlet 27i of the exhaust heat recovery boiler 25. The water supply pump 56 is provided in the water supply line 63.

  The plurality of extraction lines 67 are connected to the steam turbine casing 34 and extract steam in the steam turbine casing 34. The heat storage 40 is provided for each of the plurality of bleed lines 67. The steam recovery line 68 is connected to the plurality of regenerators 40 and returns the steam passing through the plurality of regenerators 40 to the exhaust heat recovery boiler 25.

  The auxiliary water supply line 64 branches from a position on the exhaust heat recovery boiler 25 side of the water supply pump 56 in the water supply line 63 and is connected to one of the plurality of heat storage devices 40 d. In the water supply line 63, a first water supply switching valve 71 is provided at a position closer to the exhaust heat recovery boiler 25 than a branch position of the auxiliary water supply line 64. The auxiliary water supply line 64 is provided with a second water supply switching valve 72.

  The connection line 69 connects the plurality of heat accumulators 40 in series so that the water from the auxiliary water supply line 64 sequentially flows to the plurality of heat accumulators 40.

  The auxiliary main steam line 66 includes, among the plurality of regenerators 40 connected in series by the connection line 69, another regenerator 40a farthest from one regenerator 40d connected to the auxiliary water supply line 64, The main steam line 65 is connected. In the main steam line 65, a first steam switching valve 73 is provided at a position closer to the exhaust heat recovery boiler 25 than a connection position with the auxiliary main steam line 66. Further, a second steam switching valve 74 is provided in the auxiliary main steam line 66. A main steam control valve 75 is provided in the main steam line 65 at a position closer to the steam turbine 30 than a connection position with the auxiliary main steam line 66.

  As shown in FIG. 2, the exhaust heat recovery boiler 25 includes a boiler casing 26 through which an exhaust medium from the turbine 14 flows, a economizer 27 and a superheater 29 disposed in the boiler casing 26, and a boiler And an evaporator 28 partially disposed in the casing 26. A medium inlet 26i and a medium outlet 26o of the exhaust heat recovery boiler 25 are formed in the boiler casing 26. The economizer 27, the evaporator 28, and the superheater 29 are arranged in the boiler casing 26 in this order from the medium inlet 26i to the medium outlet 26o. A water supply line 63 is connected to the economizer 27. Therefore, the water supply inlet 27i of the exhaust heat recovery boiler 25 is an end portion of the economizer 27. The economizer 27 heats the water from the water supply line 63 with the exhaust medium. The evaporator 28 further heats the water heated by the economizer 27 with an exhaust medium to produce steam. The evaporator 28 has a steam drum 28d for separating water and steam. The superheater 29 superheats the steam from the evaporator 28 with an exhaust medium. A main steam line 65 is connected to the superheater 29. Therefore, the steam outlet 29o of the exhaust heat recovery boiler 25 is an end portion of the superheater 29.

  The steam turbine rotor 31 has a rotor shaft portion 32 that rotates around the ST axis Ast, and a plurality of rotor blade rows 33 provided on the rotor shaft portion 32. The plurality of bucket rows 33 are arranged in an axial direction Da in which the ST axis Ast extends. Each of the plurality of bucket rows 33 has a plurality of buckets. The plurality of rotor blades are arranged in a circumferential direction with respect to the ST axis Ast. The steam turbine 30 has a plurality of stationary blade rows 35 fixed to a steam turbine casing 34. Each of the plurality of stationary blade rows 35 is arranged on the axial upstream side Dau of any one of the plurality of rotor blade rows 33. The axial upstream side Dau is the side of the steam inlet 34i with respect to the steam outlet 34o of the steam turbine casing 34 in the axial direction Da. Further, the axial downstream side Dad refers to the side of the steam outlet 34o with respect to the steam inlet 34i of the steam turbine casing 34 in the axial direction Da, that is, the side opposite to the axial upstream side Dau. A stage is constituted by one moving blade row 33 and one stationary blade row 35 adjacent to the axially upstream side Dau of the one moving blade row 33. This steam turbine 30 has a plurality of stages. In the following, of the plurality of stages, the stage closest to the axis upstream Dau is the first stage, and the stage adjacent to the first axis downstream Dad is the second stage. Hereinafter, similarly, a stage adjacent to the second stage downstream of the axis Dad is referred to as a third stage, a stage adjacent to the third stage downstream of the axis Dad is referred to as a fourth stage, and a fourth stage is located downstream of the axis Dad. The adjacent stage is the fifth stage.

  The solar thermal power generation equipment of this embodiment has a first bleed line 67a, a second bleed line 67b, a third bleed line 67c, and a fourth bleed line 67d as the plurality of bleed lines 67. Each extraction line 67 is connected to a different position in the steam turbine casing 34 in the axial direction Da. Specifically, the first bleed line 67a is connected in the steam turbine casing 34 at a position between the first-stage moving blade row 33 and the second-stage stationary blade row 35 in the axial direction Da. The second bleed line 67b is connected in the steam turbine casing 34 at a position between the second-stage moving blade row 33 and the third-stage stationary blade row 35 in the axial direction Da. The third bleed line 67c is connected to a position in the steam turbine casing 34 between the third-stage moving blade row 33 and the fourth-stage stationary blade row 35 in the axial direction Da. The fourth bleed line 67d is connected in the steam turbine casing 34 at a position between the fourth row of moving blade rows 33 and the fifth row of stationary blade rows 35 in the axial direction Da.

  Each of the plurality of heat storage devices 40 includes a heat storage case 41 and a heat storage body 46 disposed in the heat storage case 41. The heat storage body 46 includes a plurality of solid heat storage materials 47. The solid heat storage material 47 is, for example, a pebble made of concrete or ceramics. In the heat storage case 41, an extracted steam inlet 42, an extracted steam outlet 43, a heating target inlet 44, and a heating target outlet 45 are formed.

  The solar thermal power generation equipment of this embodiment has a first regenerator 40a, a second regenerator 40b, a third regenerator 40c, and a fourth regenerator 40d as the plurality of regenerators 40. The bleed steam inlet 42 of the first regenerator 40a is connected to the first bleed line 67a. The bleed steam inlet 42 of the second regenerator 40b is connected to the second bleed line 67b. The bleed steam inlet 42 of the third regenerator 40c is connected to the third bleed line 67c. The bleed steam inlet 42 of the fourth regenerator 40d is connected to a fourth bleed line 67d.

  The steam recovery line 68 includes a first recovery line 68a connected to the extracted steam outlet 43 of the first heat storage device 40a, a second recovery line 68b connected to the extracted steam outlet 43 of the second heat storage device 40b, and a third It has a third recovery line 68c connected to the extracted steam outlet 43 of the regenerator 40c, a fourth recovery line 68d connected to the extracted steam outlet 43 of the fourth regenerator 40d, and a main recovery line 68m. The main recovery line 68m is connected to the first recovery line 68a, the second recovery line 68b, the third recovery line 68c, the fourth recovery line 68d, and to the water supply line 63. Specifically, the main recovery line 68m is connected to a position on the exhaust heat recovery boiler 25 side of the first water supply switching valve 71 in the water supply line 63.

  The main recovery line 68m may be connected to the condenser 55. As described above, when the steam recovery line is connected to the water supply line 63 or the condenser 55, the first recovery line 68a, the second recovery line 68b, the third recovery line 68c, and the fourth recovery line 68m are not provided. Each of the recovery lines 68d may be directly connected to the water supply line 63 or the condenser 55. When the pressure of any one of the steam flowing through the first recovery line 68a, the second recovery line 68b, the third recovery line 68c, and the fourth recovery line 68d is higher than the pressure in the steam drum 28d. The recovery line through which steam higher than the pressure in the steam drum 28d flows may be connected to the steam drum 28d.

  One of the plurality of regenerators 40d described above is the fourth regenerator 40d. Therefore, the auxiliary water supply line 64 is connected to the heating target inlet 44 of the fourth regenerator 40d. Further, the other heat storage device 40a among the plurality of heat storage devices 40 described above is the first heat storage device 40a. Therefore, the auxiliary main steam line 66 is connected to the outlet 45 to be heated of the first regenerator 40a.

  The connection line 69 connects the heating target inlet 44 of the first heat storage device 40a and the heating target outlet 45 of the second heat storage device 40b, the first connection line 69a, and the heating target inlet 44 of the second heat storage device 40b. A second connecting line 69b connecting the heating target outlet 45 of the regenerator 40c, a third connecting line 69c connecting the heating target inlet 44 of the third regenerator 40c and the heating target outlet 45 of the fourth regenerator 40d, And

  The first bleed line 67a is provided with a first bleed valve 76a. The second bleed line 67b is provided with a second bleed valve 76b. The third bleed line 67c is provided with a third bleed valve 76c. The fourth bleed line 67d is provided with a fourth bleed valve 76d. The first recovery line 68a is provided with a first regenerator thermometer 83a and a first recovery valve 77a. The second recovery line 68b is provided with a second regenerator thermometer 83b and a second recovery valve 77b. The third recovery line 68c is provided with a third regenerator thermometer 83c and a third recovery valve 77c. The fourth recovery line 68d is provided with a fourth regenerator thermometer 83d and a fourth recovery valve 77d. Each of the regenerator thermometers 83a, 83b, 83c, and 83d detects the temperature of the extracted steam flowing out of the regenerators 40a, 40b, 40c, and 40d, so that the regenerator 46 in the regenerators 40a, 40b, 40c, and 40d is detected. Indirectly detects the temperature of

  The first connection line 69a is provided with a first gate valve 78a. The second connection line 69b is provided with a second gate valve 78b. The third connection line 69c is provided with a third gate valve 78c.

  In the main steam line 65, a main steam pressure gauge 81 and a main steam thermometer 82 are provided at a position closer to the steam turbine 30 than a connection position with the auxiliary main steam line 66.

  The control device 90 controls the opening and closing of each valve described above based on signals from detectors such as the pressure gauge and the thermometer described above.

  Next, the operation of the solar thermal power generation equipment described above will be described. First, a case where sunlight reaches the area where the solar thermal power generation equipment is installed will be described.

  The compressor 11 sucks the working medium and compresses the working medium to generate a compressed medium. This compression medium flows into the heat receiver 18 via the compression medium line 60. The mirror driver 57c of the plurality of heliostats 57 adjusts the direction of the reflecting mirror 57a so that the sunlight R reflected by the reflecting mirror 57a is directed to the heat receiver 18. As a result, the sunlight R reflected by the reflecting mirror 57a of the heliostat 57 is applied to the heat receiver 18. The compression medium flowing in the heat receiver 18 is heated by the heat of the sunlight R received by the heat receiver 18.

  The compression medium heated by the heat receiver 18 flows through the compression medium line 60 into the turbine casing 16. The turbine rotor 15 is rotated by the compression medium. Since the compressor rotor 12 is directly connected to the turbine rotor 15, it rotates integrally with the rotation of the turbine rotor 15. The gas turbine generator 20 generates electric power by the rotation of the gas turbine rotor 17.

  The high-temperature working medium exhausted from the turbine casing 16 flows through the medium exhaust line 61 into the boiler casing 26 of the exhaust heat recovery boiler 25 as an exhaust medium. In the medium preheater 19 provided in the medium exhaust line 61, heat exchange is performed between the exhaust medium from the medium exhaust line 61 and the compressed medium from the compressed medium line 60, and the compressed medium is heated. The compressed medium heated by the medium preheater 19 flows into the heat receiver 18 via the compression medium line 60 as described above, and is further heated by the heat receiver 18.

  Water is supplied from a water supply line 63 to the economizer 27 of the exhaust heat recovery boiler 25. In the economizer 27, the exhaust medium and the water exchange heat, and the water is heated. The water heated by the economizer 27 flows into the evaporator 28 of the heat recovery steam generator 25. In the evaporator 28, the water from the economizer 27 and the exhaust medium exchange heat, and the water is heated to steam. This steam flows into the superheater 29 of the exhaust heat recovery boiler 25. In the superheater 29, the steam and the exhaust medium exchange heat, and the steam is superheated.

  The steam superheated by the superheater 29 of the exhaust heat recovery boiler 25 flows into the steam turbine casing 34 via the main steam line 65. The steam turbine rotor 31 is rotated by the steam. The steam turbine generator 50 generates power by the rotation of the steam turbine rotor 31.

  The steam exhausted from the steam turbine casing 34 flows into the condenser 55 and is cooled by the condenser 55 to become water. This water flows into the economizer 27 of the exhaust heat recovery boiler 25 via the water supply line 63.

  The working medium flowing out of the boiler casing 26 of the exhaust heat recovery boiler 25 flows into the compressor 11 again via the medium circulation line 62.

  After the turbine rotor 15 starts rotating and before the steam turbine 30 starts operating, as shown in FIG. 3, the second feedwater switching valve 72, the second steam switching valve 74, the main steam control valve 75, One bleed valve 76a, second bleed valve 76b, third bleed valve 76c, fourth bleed valve 76d, first recovery valve 77a, second recovery valve 77b, third recovery valve 77c, fourth recovery valve 77d, first partition The valve 78a, the second gate valve 78b, and the third gate valve 78c are closed. On the other hand, the first feedwater switching valve 71 and the first steam switching valve 73 are open.

  After the turbine rotor 15 starts to rotate, the high-temperature exhaust medium starts flowing into the exhaust heat recovery boiler 25. A certain period of time is required from when the high-temperature exhaust medium starts flowing into the exhaust heat recovery boiler 25 to when steam under conditions necessary for driving the steam turbine 30 is generated. Therefore, after the turbine rotor 15 starts to rotate and before the steam turbine 30 starts to operate, as described above, the main steam control valve 75 is closed.

  When the pressure of the steam detected by the main steam pressure gauge 81 becomes higher than the predetermined start-up pressure and the temperature of the steam detected by the main steam thermometer 82 becomes higher than the predetermined start-up temperature, Control unit 90 sends an opening instruction to main steam control valve 75, assuming that the steam satisfies the startup state quantity condition in startup of steam turbine 30. As a result, the main steam control valve 75 opens, and as described above, the steam from the exhaust heat recovery boiler 25 flows into the steam turbine 30, and the steam turbine rotor 31 rotates.

  Thereafter, when the gas turbine 10 is continuously driven, the temperature and pressure of the steam from the exhaust heat recovery boiler 25 gradually increase. When the pressure of the steam detected by the main steam pressure gauge 81 becomes equal to or higher than the predetermined heat storage pressure and the temperature of the steam detected by the main steam thermometer 82 becomes equal to or higher than the predetermined heat storage temperature, Assuming that the steam satisfies the heat storage state quantity condition, the control device 90 determines, as shown in FIG. 4, the first bleed valve 76a, the second bleed valve 76b, the third bleed valve 76c, the fourth bleed valve 76d, An open instruction is sent to the first recovery valve 77a, the second recovery valve 77b, the third recovery valve 77c, and the fourth recovery valve 77d, and the first bleed valve 76a, the second bleed valve 76b, the third bleed valve 76c, and the fourth bleed valve The valve 76d, the first recovery valve 77a, the second recovery valve 77b, the third recovery valve 77c, and the fourth recovery valve 77d are opened. Note that the heat storage pressure is a pressure equal to or higher than the above-described startup pressure. The heat storage temperature is a temperature equal to or higher than the above-described startup temperature. Further, in the present embodiment, the main steam pressure gauge 81 and the main steam thermometer 82 constitute a state quantity detector for detecting a state quantity of the main steam.

  When the first bleed valve 76a and the first recovery valve 77a are opened, the steam that has passed through the first stage of the steam turbine 30 is bled from the steam turbine 30, and the bleed steam is passed through the first bleed line 67a to the first regenerator. It flows into the heat storage case 41 of 40a. The extracted steam flowing into the heat storage case 41 exchanges heat with the plurality of solid heat storage materials 47 and heats the plurality of solid heat storage materials 47. That is, the plurality of solid heat storage materials 47 store heat. The steam that has flowed into the heat storage case 41 of the first heat storage device 40a is cooled by heat exchange with the plurality of solid heat storage materials 47, passes through the first recovery line 68a and the main recovery line 68m, and then passes through the exhaust heat recovery boiler 25. Into the steam drum 28d.

  The steam that has passed through the second and subsequent stages of the steam turbine 30 is extracted from the steam turbine 30 in the same manner as described above, and is connected to the extraction line 67 via the extraction line 67 corresponding to each stage. It flows into the heat storage case 41. The extracted steam is cooled while heating the plurality of solid heat storage materials 47 in the heat storage case 41. The extracted steam cooled in the heat storage case 41 flows into the exhaust heat recovery boiler 25 via the recovery lines 68a, 68b, 68c, 68d, the main recovery line 68m, and the water supply line 63 corresponding to the heat storage case 41.

  When the temperature detected by the first heat storage element thermometer 83a becomes equal to or higher than the predetermined heat storage completion temperature, the control device 90 determines that the heat storage of the first heat storage device 40a has been completed and determines that the first bleed valve 76a and the first recovery valve A closing instruction is sent to 77a. As a result, the steam that has passed through the first stage of the steam turbine 30 does not flow into the first regenerator 40a via the first bleed line 67a. Thereafter, when the temperature of the steam detected by the main steam thermometer 82 is higher than the above-described heat storage temperature and the temperature detected by the first heat storage body thermometer 83a becomes equal to or lower than the heat storage start temperature lower than the heat storage completion temperature. The control device 90 sends an opening instruction to the first bleed valve 76a and the first recovery valve 77a to cause the first heat storage device 40a to perform a heat storage operation.

  When the temperature detected by the heat storage thermometer corresponding to each of the second and subsequent stages of the steam turbine 30 becomes equal to or higher than the predetermined heat storage completion temperature, the control device 90 controls the bleed valve and the recovery valve corresponding to each stage. And send a close instruction. As a result, the steam that has passed through each stage of the steam turbine 30 does not flow into each regenerator 40 via each extraction line 67. Thereafter, in a state where the temperature of the steam detected by the main steam thermometer 82 is higher than the temperature at the time of the heat storage, the temperature detected by each of the heat storage body thermometers 83a, 83b, 83c, 84d is lower than the heat storage completion temperature. When the temperature becomes equal to or lower than the start temperature, the control device 90 sends an opening instruction to the bleed valve and the recovery valve corresponding to each stage, and causes the regenerator 40 corresponding to each stage to perform a heat storage operation.

  The first heat storage completion temperature which is a predetermined heat storage completion temperature with respect to the temperature detected by the first heat storage body thermometer 83a, and the predetermined heat storage completion temperature which is detected by the second heat storage body thermometer 83b. The second heat storage completion temperature, which is the completion temperature, and the third heat storage completion temperature, which is a predetermined heat storage completion temperature with respect to the temperature detected by the third heat storage thermometer 83c, are detected by the fourth heat storage thermometer 83d. The fourth heat storage completion temperature, which is a predetermined heat storage completion temperature with respect to the temperature, decreases in the order of first, second, third, and fourth.

  Also, a first heat storage start temperature which is a predetermined heat storage start temperature with respect to the temperature detected by the first heat storage element thermometer 83a, and a heat storage predetermined with respect to the temperature detected by the second heat storage element thermometer 83b. The second heat storage start temperature, which is the start temperature, and the temperature detected by the third heat storage element thermometer 83c, are detected by the third heat storage start temperature, which is a predetermined heat storage start temperature, and the fourth heat storage element thermometer 83d. The fourth heat storage start temperature, which is a predetermined heat storage start temperature with respect to temperature, decreases in the order of first, second, third, and fourth.

  In the present embodiment, when the heat storage body 46 of each heat storage device 40 stores heat, the temperature range of the steam flowing into the steam turbine 30 is within a certain range equal to or higher than the above-described heat storage temperature. The temperature of the extracted steam extracted from the steam turbine 30 via each extraction line 67 decreases as the extraction position of the extracted steam becomes closer to the axis downstream Dad. However, the temperature range of the extracted steam extracted from the steam turbine 30 via each extraction line 67 is within a certain range for each extraction line 67. Therefore, the temperature range of the heat storage unit 46 of the heat storage unit 40 connected to each extraction line 67 after the heat storage of the heat storage unit 46 also falls within a certain range for each heat storage unit 40. Note that the temperature of the heat storage body 46 of the first heat storage device 40a after the heat storage is higher than the temperature of the heat storage body 46 of the second heat storage device 40b after the heat storage. The temperature of the second heat storage unit 40b after the heat storage of the heat storage unit 46 is higher than the temperature of the third heat storage unit 40c after the heat storage of the heat storage unit 46. The temperature of the heat storage unit 46 of the third heat storage unit 40c after the heat storage is higher than the temperature of the heat storage unit 46 of the fourth heat storage unit 40d after the heat storage. Therefore, the first regenerator 40a is the highest temperature regenerator (one regenerator). The fourth regenerator 40d is the lowest temperature regenerator (other regenerator).

  Next, a case where sunlight stops reaching an area where the solar thermal power generation equipment is installed will be described. Here, before the sunlight stops reaching the area where the solar thermal power generation equipment is installed, the heat storage of all the heat storage units 40 is completed, and the first bleed valve 76a, the second bleed valve 76b, and the third It is assumed that the bleed valve 76c, the fourth bleed valve 76d, the first recovery valve 77a, the second recovery valve 77b, the third recovery valve 77c, and the fourth recovery valve 77d are closed.

  When the sunlight stops reaching the area where the solar thermal power generation equipment is installed, the gas turbine 10 stops, and the pressure and temperature of the steam from the exhaust heat recovery boiler 25 gradually decrease. For this reason, when sunlight stops reaching the area where the solar thermal power generation equipment is installed, the gas turbine generator 20 stops generating power.

  When the sunlight does not reach the area where the solar thermal power generation equipment is installed, the pressure of the steam detected by the main steam pressure gauge 81 becomes lower than a predetermined pressure at the time of heat radiation, and is detected by the main steam thermometer 82. When the temperature of the steam becomes lower than a predetermined temperature at the time of heat release, the control device 90 determines that the steam satisfies the heat release condition, and as shown in FIG. An opening instruction is given to the valve 74, the first gate valve 78a, the second gate valve 78b, and the third gate valve 78c.

  As a result, the second feed water switching valve 72, the second steam switching valve 74, the first gate valve 78a, the second gate valve 78b, and the third gate valve 78c are opened, and a part of the water from the water feed pump 56 is supplied as auxiliary water. It flows into the heat storage case 41 of the fourth heat storage device 40d via the line 64. The water flowing into the heat storage case 41 is heated by heat exchange with the plurality of solid heat storage materials 47 in the heat storage case 41.

  The water heated by the fourth heat storage device 40d flows into the heat storage case 41 of the third heat storage device 40c via the third connection line 69c. The water flowing into the heat storage case 41 is further heated by heat exchange with the plurality of solid heat storage materials 47 in the heat storage case 41.

  The water heated by the third heat storage device 40c flows into the heat storage case 41 of the second heat storage device 40b via the second connection line 69b. The water that has flowed into the heat storage case 41 is further heated by heat exchange with the plurality of solid heat storage materials 47 in the heat storage case 41, and becomes steam in some cases.

  The water heated by the second heat storage device 40b or the steam generated by the second heat storage device 40b flows into the heat storage case 41 of the first heat storage device 40a via the first connection line 69a. The water or steam flowing into the heat storage case 41 is heated by heat exchange with the plurality of solid heat storage materials 47 in the heat storage case 41 to become superheated steam. The superheated steam flows into the steam turbine casing 34 via the auxiliary main steam line 66 and the main steam line 65. The steam turbine rotor 31 is rotated by the steam. The steam turbine generator 50 generates power by the rotation of the steam turbine rotor 31.

  After giving the opening instruction to the second feed water switching valve 72, the second steam switching valve 74, the first gate valve 78a, the second gate valve 78b, and the third gate valve 78c, the control device 90 passes a predetermined time. When such conditions are satisfied, a closing instruction is sent to the first feedwater switching valve 71 and the first steam switching valve 73. As a result, the first water supply switching valve 71 and the first steam switching valve 73 close, and the water from the water supply pump 56 flows into the heat storage case 41 of the fourth heat storage device 40d exclusively via the auxiliary water supply line 64. At first, it does not flow into the exhaust heat recovery boiler 25. Further, even if the pressure of the steam from the exhaust heat recovery boiler 25 decreases, the steam from the auxiliary main steam line 66 exclusively flows into the steam turbine 30 and does not flow into the exhaust heat recovery boiler 25.

  When the temperature detected by the first heat storage element thermometer 83a becomes equal to or lower than the predetermined heat release end temperature, the control device 90 sets the main steam control valve 75, the first gate valve 78a, the second gate valve 78b, and the third gate valve. At the same time, a closing instruction is sent to the second steam switching valve 74 and the second water supply switching valve 72, and a stop instruction is sent to the water supply pump 56. As a result, the main steam control valve 75, the first gate valve 78a, the second gate valve 78b, the third gate valve 78c, the second steam switching valve 74, and the second water supply switching valve 72 are closed, and the water supply pump 56 is Stop. Further, since steam does not flow into the steam turbine casing 34, the steam turbine 30 is also stopped. Therefore, the power generation by the steam turbine generator 50 ends.

  As described above, in the present embodiment, the steam turbine generator 50 can continuously generate power even after sunlight stops reaching the area where the solar thermal power generation equipment is installed.

  Further, in the present embodiment, since the water is sequentially heated by the heat storage units 46 having different temperatures for each of the plurality of heat storage units 40 to generate steam, it is possible to generate steam by heating water with one heat storage unit. Thus, the heat stored in the heat storage body can be efficiently used.

  In the present embodiment, as described above, the temperature range after the heat storage of the heat storage body 46 of the heat storage device 40 connected to each bleed line 67 is within a certain range for each heat storage device 40. For this reason, when the heat from the heat storage bodies 46 of the plurality of heat storage units 40 is radiated to generate water to be heated to generate steam to be sent to the steam turbine 30, the temperature range of the steam falls within a certain range. Therefore, for example, as described above, even when the steam turbine 30 is continuously driven after the sunlight no longer reaches the area where the solar thermal power generation facility is installed, the steam turbine 30 can be stably operated.

  In the present embodiment, since the compressor 11 sucks the working medium exhausted from the exhaust heat recovery boiler 25, the temperature of the working medium sucked by the compressor 11 becomes higher than when the compressor 11 sucks outside air as the working medium. . Further, in the present embodiment, since the compressor 11 sucks the working medium exhausted from the exhaust heat recovery boiler 25, the pressure of the working medium sucked by the compressor 11 is lower than that when the compressor 11 sucks outside air as the working medium. Get higher.

  Therefore, in the present embodiment, a higher-temperature and higher-pressure working medium can be supplied to the turbine 14 than when the compressor 11 sucks outside air as a working medium. For this reason, in the present embodiment, the output of the gas turbine 10 can be higher than in the case where the compressor 11 sucks in outside air as the working medium.

  In the present embodiment, a low-boiling medium having a lower evaporation temperature than air is used as the working medium. For this reason, even if the turbine outlet temperature of the working medium is the same as the case where air is used as the working medium, by adjusting the pressure in the medium circulation line 62, the temperature range where the phase of the working medium is in the gas phase is adjusted. Can be widened. Therefore, in obtaining energy from the gas-phase working medium, in the present embodiment, the energy drop can be made larger than when air is used as the working medium. For this reason, in the present embodiment, from this viewpoint as well, the output of the gas turbine can be increased as compared with the case where air is used as the working medium.

  Note that the working medium of the present embodiment may be air instead of the low-boiling medium. However, in the present embodiment, when air is used as the working medium, the merit of using a low-boiling medium as the working medium cannot be obtained.

  Also, a case has been described above where the steam turbine 30 is continuously driven after the sunlight no longer reaches the area where the solar thermal power generation equipment is installed. However, after sunlight stops reaching the area where the solar thermal power generation equipment is installed, the steam turbine 30 is temporarily stopped, and when the power demand increases, the heat from the heat storage body 46 of the plurality of heat storage units 40 is reduced. May be radiated to generate steam, and the steam may be used to drive the steam turbine 30.

"Modification"
The solar thermal power generation equipment of the above embodiment includes the medium preheater 19. However, the solar thermal power generation equipment does not need to include the medium preheater 19.

  In the above embodiment, the bleeding in the plurality of bleeding lines 67 is started simultaneously. However, the bleeding in the plurality of bleeding lines 67 does not have to be started simultaneously. For example, bleeding by the fourth bleed line 67d is performed first, and after the heat storage of the heat storage body 46 of the fourth regenerator 40d is completed with bleed steam from the fourth bleed line 67d, bleed is performed by the third bleed line 67c. Thereafter, the bleeding may be sequentially performed by the second bleeding line 67b and the first bleeding line 67a.

  The number of regenerators 40 in the above embodiment is four. However, the number of regenerators 40 may be two, three, three, five or more. Also in this case, the number of the bleed lines 67 matches the number of the heat accumulators 40.

  The solar thermal power generation equipment of the above embodiment includes a gas turbine generator 20 that generates power by driving the gas turbine 10 and a steam turbine generator 50 that generates power by driving the steam turbine 30. However, the solar thermal power generation facility may include only one generator that generates power by driving the gas turbine 10 and driving the steam turbine 30. In this case, even if the gas turbine 10 is driven and the steam turbine 30 is not driven, a clutch is provided between the steam turbine rotor 31 and the generator rotor so that power can be generated by one generator. Can be Also, in this case, even if the steam turbine 30 is driven and the gas turbine 10 is not driven, a clutch is provided between the gas turbine rotor 17 and the generator rotor so that power can be generated by one generator. Is provided.

  The first heat storage device 40a of the above embodiment has only a function as a heat storage device exclusively. However, the first regenerator 40a is provided with a function as a heat receiver, and the sunlight from a part of the plurality of heliostats 57 is directed to the first regenerator 40a. The plurality of solid thermal storage materials 47 of 40a may be heated by solar heat. That is, the plurality of solid heat storage materials 47 of the first heat storage device 40a may be further heated by solar heat while being heated by the extracted steam. In this modified example, after the exhaust heat recovery boiler 25 stops generating steam, steam at a higher temperature than in the above embodiment can be supplied to the steam turbine 30.

  In the above embodiment, only the regenerator 40 that stores heat using the heat of the steam extracted from the steam turbine 30 is provided. However, as shown in FIG. 6, a main steam regenerator 40x that stores heat using the heat of the main steam flowing through the main steam line 65 may be added to the solar thermal power generation equipment of the above embodiment. In this case, a heat storage main steam line 67x for guiding the steam from the exhaust heat recovery boiler 25 to the main steam regenerator 40x, and a heat storage main steam recovery line 68x for recovering the steam passing through the main steam regenerator 40x are further provided. Prepare.

  The main steam regenerator 40x has a regenerator case 41 and a regenerator arranged in the regenerator case 41, similarly to the regenerator 40 of the above embodiment. This heat storage body includes a plurality of solid heat storage materials 47. In the heat storage case 41, a steam inlet 42, a steam outlet 43, a heating target inlet 44, and a heating target outlet 45 are formed. The main steam regenerator 40x is provided in the auxiliary main steam line 66 at a position closer to the first regenerator 40a than the second steam switching valve 74. The heating target inlet 44 and the heating target outlet 45 of the main steam regenerator 40x are both provided in the auxiliary main steam line 66. In the auxiliary main steam line 66, a gate valve 78x is provided between the heating target inlet 44 of the main steam regenerator 40x and the first regenerator 40a. The main steam line 67x for heat storage branches off from the main steam line 65 and is connected to the steam inlet 42 of the main steam regenerator 40x. The main steam line for heat storage 67x is provided with a main steam valve for heat storage 76x. The first end of the heat storage main steam recovery line 68x is connected to the steam outlet 43 of the main steam regenerator 40x, and the second end of the heat storage main steam recovery line 68x is connected to the main recovery line 68m. A main steam regenerator thermometer 83x and a main steam recovery valve 77x are provided in the main steam recovery line 68x for heat storage. The main steam regenerator thermometer 83x indirectly detects the temperature of the regenerator in the main steam regenerator 40x by detecting the temperature of the steam flowing out of the main steam regenerator 40x.

  The heat storage main steam valve 76x corresponds to the first bleed valve 76a for the first heat storage device 40a. Therefore, the heat storage main steam valve 76x is controlled by the control device 90 in basically the same manner as the first bleed valve 76a. The gate valve 78x corresponds to the first gate valve 78a for the first regenerator 40a. For this reason, the gate valve 78x is controlled by the control device 90 basically in the same manner as the first gate valve 78a. The main steam recovery valve for heat storage 77x corresponds to the first recovery valve 77a for the first heat storage device 40a. Therefore, the heat storage main steam recovery valve 77x is basically controlled by the control device 90 in the same manner as the first recovery valve 77a. Therefore, the heat storage main steam valve 76x and the heat storage main steam recovery valve are detected by the control device 90 by the main steam pressure gauge 81 and the main steam thermometer 82, similarly to the first bleed valve 76a and the first recovery valve 77a. Opening and closing control is performed according to the state quantity of the main steam and the temperature of the heat storage element detected by the main steam heat storage element thermometer 83x.

  Also in this modification, after the exhaust heat recovery boiler 25 stops generating steam, it is possible to supply steam having a higher temperature than the above embodiment to the steam turbine 30.

  The heat storage body 46 of the above embodiment is a plurality of solid heat storage materials 47. However, the heat storage body 46 may be a heat storage liquid or a latent heat storage material. Note that the latent heat storage material is a heat storage material that undergoes a phase change according to its own temperature. This latent heat storage material is a liquid when heat is stored. On the other hand, this heat storage material is solid in a state where heat is radiated. Such a latent heat storage material includes, for example, a molten salt made of a mixture of sodium nitrate, sodium nitrite, and potassium nitrate.

  In the above embodiment, the steam generator that generates steam using solar heat is the heat receiver 18 that has received the sunlight and the working medium that is heated by the heat receiver 18, and is exhausted from the gas turbine 10. An exhaust heat recovery boiler 25 that generates steam using the heat of the working medium (exhaust medium). However, in the solar thermal power generation equipment, the steam generator that generates steam by using solar heat has a heat receiver and does not need to have an exhaust heat recovery boiler. In this case, the solar thermal power generation equipment does not include the gas turbine 10, but heats water with a heat receiver, turns the water into steam, and guides the steam to the steam turbine.

10: gas turbine 11: compressor 12: compressor rotor 13: compressor casing 13i: medium inlet 13o: medium outlet 14: turbine 15: turbine rotor 16: turbine casing 16i: medium inlet 16o: medium outlet 17: gas turbine rotor 18: Heat receiver (part of steam generator)
19: Medium preheater 20: Gas turbine generator 21: Generator rotor 22: Generator casing 25: Exhaust heat recovery boiler (part of steam generator)
26: boiler casing 26i: medium inlet 26o: medium outlet 27: economizer 27i: feed water inlet 28: evaporator 28d: steam drum 29: superheater 29o: steam outlet 30: steam turbine 31: steam turbine rotor 32: rotor shaft Part 33: moving blade row 34: steam turbine casing 34i: steam inlet 34o: steam outlet 35: stationary blade row 40: regenerator 41: heat storage case 42: extracted steam inlet 43: extracted steam outlet 44: heating target inlet 45: heating Target outlet 46: Thermal storage 47: Solid thermal storage material 40a: First thermal storage (other thermal storage, highest temperature thermal storage)
40b: second regenerator 40c: third regenerator 40d: fourth regenerator (one regenerator, lowest temperature regenerator)
40x: Main steam regenerator 40x
50: steam turbine generator 51: generator rotor 52: generator casing 55: condenser 56: feed pump 57: heliostat 57a: reflecting mirror 57b: support leg 57c: mirror drive 60: compression medium line 61: medium Exhaust line 62: Medium circulation line 63: Water supply line 64: Auxiliary water supply line 65: Main steam line 66: Auxiliary main steam line 67: Bleed line 67a: First bleed line (highest temperature bleed line)
67b: second bleed line 67c: third bleed line 67d: fourth bleed line (lowest temperature bleed line)
67x: Main steam line for heat storage 67x
68: steam recovery line 68a: first recovery line 68b: second recovery line 68c: third recovery line 68d: fourth recovery line 68x: main steam recovery line for heat storage 68m: main recovery line 69: connecting line 69a: first Connecting line 69b: Second connecting line 69c: Third connecting line 71: First feed water switching valve 72: Second feed water switching valve 73: First steam switching valve 74: Second steam switching valve 75: Main steam control valve 76a: First bleed valve 76b: Second bleed valve 76c: Third bleed valve 76d: Fourth bleed valve 76x: Main steam valve 77a for heat storage: First recovery valve 77b: Second recovery valve 77c: Third recovery valve 77d: Second Four recovery valve 77x: Main steam recovery valve for heat storage 78a: First gate valve 78b: Second gate valve 78c: Third gate valve 78x: Gate valve 81: Main steam pressure gauge (state quantity detector)
82: Main steam thermometer (state quantity detector)
83a: first regenerator thermometer 83b: second regenerator thermometer 83c: third regenerator thermometer 83d: fourth regenerator thermometer 83x: main steam regenerator thermometer 90: controller Agt: GT axis Ast: ST axis Da: axial direction Dau: upstream of axis Dad: downstream of axis R: sunlight

Claims (10)

A steam generator that generates steam using solar heat,
A steam turbine driven by steam,
A main steam line that guides steam from the steam generator to the steam turbine;
A generator that generates power by driving the steam turbine,
A condenser for returning steam exhausted from the steam turbine to water,
A water supply line connecting the condenser and the steam generator,
A plurality of extraction lines for extracting steam from the steam turbine,
A heat storage device provided for each of the plurality of bleeding lines, and having a heat storage body for storing heat of steam,
An auxiliary water supply line branched from the water supply line and connected to one of the plurality of heat accumulators;
As the water from the auxiliary water supply line flows sequentially to the plurality of regenerators, a connection line that connects a plurality of the regenerators in series,
Among the plurality of heat accumulators, an auxiliary main steam line that connects the main steam line with another heat accumulator other than the one heat accumulator,
With
The steam turbine has a steam turbine rotor that rotates around an axis, and a steam turbine casing that covers the steam turbine rotor,
In the steam turbine casing, the plurality of extraction lines are connected to different positions in the axial direction in which the axis extends, and extract steam having different temperatures in the steam turbine casing,
The one regenerator is a lowest-temperature regenerator connected to a lowest-temperature bleed line through which the lowest-temperature steam flows, among the plurality of bleed lines,
The other regenerator is a highest-temperature regenerator connected to the highest-temperature bleed line in which the highest-temperature steam flows, among the plurality of bleed lines,
Solar thermal power plant. The solar thermal power plant according to claim 1,
A thermometer that detects the temperature of the heat storage body for each of the plurality of heat storage devices;
A bleed valve provided in the bleed line for each of the plurality of heat storage units,
With
Each of the bleed valves for each of the plurality of regenerators, depending on the temperature of the heat storage body of the regenerator corresponding to the bleed valve, determines the flow rate of steam flowing through the bleed line provided with the bleed valve. Adjust,
Solar thermal power plant. The solar thermal power plant according to claim 2,
Each of the bleed valves for each of the plurality of regenerators is closed when the temperature of the heat storage body of the regenerator corresponding to the bleed valve is equal to or higher than a predetermined temperature.
Solar thermal power plant. In the solar thermal power generation facility according to claim 2 or 3,
A state quantity detector for detecting a state quantity of steam flowing through the main steam line,
Each of the bleed valves for each of the plurality of regenerators adjusts the flow rate of steam flowing through the bleed line provided with the bleed valve in accordance with the state quantity of steam detected by the state quantity detector. ,
Solar thermal power plant. In the solar thermal power generation facility according to any one of claims 1 to 4,
The plurality of heat accumulators respectively include a heat storage case, and a plurality of solid heat storage materials as the heat storage body, which are disposed in the heat storage case.
Solar thermal power plant. The solar thermal power plant according to any one of claims 1 to 5,
The steam generator has a heat receiver that receives sunlight.
Solar thermal power plant. The solar thermal power plant according to any one of claims 1 to 5,
A compressor for compressing a working medium to generate a compressed medium;
A heat receiver that receives sunlight and heats the compression medium;
A turbine driven by the compression medium heated by the heat receiver;
An exhaust heat recovery boiler that generates steam with the working medium exhausted from the turbine;
Is further provided,
The steam generator has the heat receiver and the exhaust heat recovery boiler,
Solar thermal power plant. The solar thermal power generation facility according to claim 7,
The working medium exhausted from the turbine heats the compression medium from the compressor, and further includes a medium preheater that sends the heated compression medium to the heat receiver.
Solar thermal power plant. The solar thermal power generation facility according to claim 7 or 8,
A medium circulation line that returns the working medium exhausted from the exhaust heat recovery boiler to the compressor,
Solar thermal power plant. The solar thermal power generation facility according to claim 6 or 7,
A heliostat further comprising: a reflecting mirror that reflects sunlight, and a mirror driver that changes the direction of the reflecting mirror so that the sunlight reflected by the reflecting mirror faces the heat receiver,
Solar thermal power plant.

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