JP2014092086A - Solar heat power plant, and solar heat storage and radiation apparatus - Google Patents

Abstract

【Task】
Provided are a solar thermal power plant and a solar thermal storage and heat dissipation device capable of simplifying a cycle in a solar thermal power plant to reduce construction cost and effectively store solar heat.
[Solution]
A solar thermal power plant uses a solar heat collector that generates superheated steam using water / steam as a heat medium, a solar heat storage / heat dissipator that uses molten salt or oil as a solar heat storage heat dissipation heat medium, and steam as a heat medium. When the solar heat collected in the heat medium of the solar heat collector is stored in the solar heat storage / heat dissipator, the heat medium of the solar heat collector is water whose temperature is lower than the saturation temperature from the superheated steam. In the process leading to, heat is stored in a plurality of solar heat storage heat dissipation heat medium tanks in a plurality of temperature regions according to the state of water / steam.
[Selection] Figure 1

Description

  The present invention relates to a solar thermal power generation plant and a solar thermal storage heat dissipation device.

  A solar thermal power plant is generally provided with a heat storage device so that it can operate stably even when the solar radiation fluctuates and can generate power even at night or in the rain.

  For example, in Patent Document 1, steam supplied to a steam turbine by supplying heat from a solar heat collector to a steam generating heat exchanger and exchanging heat between the hot heat medium and feed water from the steam turbine. At the time of heat storage, the heat medium that has become high temperature by the solar heat collector is divided and supplied to the heat exchanger for heat storage device to exchange heat with the low-temperature heat storage material from the heat storage device. The heat storage device stores heat, and at the time of heat dissipation, the heat medium supplied to the solar heat collector that has become low temperature due to heat exchange with the feed water in the steam generating heat exchanger is divided into heat storage devices for heat storage devices. The heat is supplied and exchanged with the high-temperature heat storage material from the heat storage device, and is supplied to the heat exchanger for generating steam as a high-temperature heat medium to generate steam.

  Moreover, in patent document 2, the low temperature thermal storage tank, the intermediate temperature thermal storage tank, and the high temperature thermal storage tank are provided as the solar thermal storage device, and the trough solar thermal collector and the tower solar thermal collector are provided as the solar thermal collector. Then, the heat medium stored in the low-temperature heat storage tank is supplied to the trough solar heat collector, and the intermediate heat medium heated up to the first temperature in the trough heat collector is stored in the intermediate heat storage tank. The accommodated heat medium is supplied to the tower type solar heat collector, and the high temperature heat medium heated to the second temperature in the tower type solar heat collector is housed in the high temperature heat storage tank. Then, a high-temperature heat medium is supplied from the high-temperature heat storage tank to the heat exchanger for generating steam as a heating medium, and the steam generated in the heat exchanger is supplied to the steam turbine for power generation. Further, the heat medium that has become low temperature by heat exchange with the heat exchanger for generating steam is returned to the low temperature heat storage tank.

JP 2012-37217 A (FIG. 5) US Pat. No. 7,296,410 (FIG. 3)

  In Patent Document 1, there are three types of heat media, a heat medium that recovers solar heat, a heat medium that stores solar heat (heat storage material), and a heat medium that rotates a steam turbine, each of which is independent of each other. It has a heat medium cycle configuration. For example, a heat medium oil made for high-temperature specifications for solar heat recovery is used as a heat medium for recovering solar heat (primary heat medium), and a molten salt as a heat medium (secondary heat medium) for storing solar heat energy In addition, water / steam is used as a heat medium (third heat medium) of the steam turbine heat cycle. As described above, the conventional solar power plant requires three cycles of the primary heat medium / oil cycle, the secondary heat medium / molten salt cycle, and the tertiary heat medium / steam cycle. This will increase the construction cost of the solar thermal power plant.

  Also in Patent Document 2, the heat medium cycle that collects and stores solar heat and the steam turbine heat cycle are composed of separate heat mediums, which complicates the equipment configuration and increases the construction cost of the solar thermal power plant. It becomes a factor. In addition, there are concerns about the complexity of operations.

  An object of the present invention is to provide a solar thermal power generation plant and a solar thermal storage heat dissipation device that can simplify the cycle in the solar thermal power generation plant, reduce the construction cost, and effectively store solar heat.

  The solar thermal power plant of the present invention includes a solar heat collector that uses water / steam as a heat medium to generate superheated steam, a solar heat storage / heat dissipator using molten salt or oil as a solar heat storage / heat dissipation heat medium, and heats steam. When the solar heat collected from the heat medium of the solar heat collecting device is stored in the solar heat storage and heat dissipation device, the heat medium of the solar heat collecting device is heated from the superheated steam to the saturation temperature. In the process of reaching low-temperature water, heat is stored in a plurality of solar heat storage heat dissipation heat medium tanks in a plurality of temperature regions according to the state of water / steam.

  According to the present invention, since the heat medium of the solar heat collecting apparatus and the heat medium of the steam turbine power generation facility are the same, it is possible to simplify the cycle in the solar thermal power plant and reduce the construction cost. Moreover, it becomes possible to store solar heat effectively from the heat medium (water vapor | steam) which collect | recovered solar heat with the solar heat collecting device.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is an overall configuration diagram of a medium-sized solar thermal power plant according to an embodiment of the present invention. The detailed block diagram of the solar thermal storage heat dissipation apparatus in the medium size solar thermal power plant of FIG. The figure explaining the thermal storage driving | operation in the medium-sized solar thermal power plant of FIG. The figure explaining the high temperature / low temperature heat storage medium movement position in the heat storage operation of the medium-sized solar thermal power plant of FIG. The figure explaining the thermal radiation driving | operation in the medium-sized solar thermal power generation plant of FIG. The figure explaining the high temperature / low temperature heat radiating medium moving position in the heat radiation operation of the medium-sized solar thermal power plant of FIG. The whole block diagram of the small solar thermal power generation plant of other one Example of this invention. FIG. 6 is a detailed configuration diagram of a solar heat storage and heat dissipation device in the small solar thermal power plant of FIG. 5. The figure explaining the structural example of the saturated steam condenser used for the Example of this invention. The figure explaining the concept of the solar thermal management applied to the Example of this invention.

  Examples of the present invention will be described below.

  The solar thermal power plant according to the embodiment of the present invention collects heat from the sun during the day, generates steam with the heat, and rotates the steam turbine generator to generate power, and at the same time, stores a part of the heat during the day. Even at night, the stored solar thermal energy is dissipated and steam is generated by the heat so that the steam turbine generator can be turned to generate electricity. That is, solar heat is recovered without installing many heat medium cycles as in the separate cycle of primary, secondary, and tertiary heat medium that is generally employed in conventional solar thermal power plants. As a heat medium for recovering the heat radiation from the heat radiating device, water / water vapor, that is, the same heat medium as the water vapor that rotates the steam turbine is used instead of oil, and the heat medium is integrated to form a simplified heat medium cycle. That is, a solar heat collection heat medium cycle (primary heat medium cycle part) that collects solar heat using water / water vapor as a heat medium, and a secondary that stores or dissipates the collected solar heat using molten salt or high-temperature heat medium oil Used in primary heat medium cycle part and tertiary heat medium cycle part in three cycle parts of heat medium cycle part and steam cycle of steam turbine using water / steam as heat medium (steam turbine cycle / tertiary heat medium cycle part) The heat medium to be used is water / steam (primary heat medium = tertiary heat medium. Hereinafter, in the embodiments of the present invention, the heat medium is collectively referred to as a primary heat medium). We are simplifying and rationalizing.

  In addition, the solar thermal power generation plant according to the embodiment of the present invention, in other words, uses the solar thermal collector as one corresponding to the boiler of the steam power plant, and connects the solar thermal collection heat medium cycle and the steam turbine cycle. In addition, the cycle from the side corresponding to the solar heat collection heat medium cycle (solar thermal collector) to the side corresponding to the steam turbine cycle (steam turbine power generation equipment) and the steam turbine cycle The primary heat medium is branched on the way from the corresponding side to the side corresponding to the solar heat collecting heat medium cycle so as to exchange heat with the heat medium of the solar heat storage and heat dissipation device. Then, the primary heat medium that is cooled by heat exchange with the heat medium of the solar heat storage / heat dissipator and becomes water is transferred to the condensate / water supply system on the side corresponding to the steam turbine cycle, for example, a deaerator. I try to let it flow.

  Moreover, in the solar thermal power generation plant of the Example of this invention, when the amount of direct solar radiation is high in the daytime, as a structure of the solar thermal collector which collects solar heat to water / steam (primary heat medium), generation of saturated steam from feed water In addition, the solar heat is recovered in two stages of generation of superheated steam from saturated steam. That is, the trough type or Fresnel type solar heat recovery device (evaporator) installed on the ground heats the feed water from the steam turbine cycle to generate saturated steam, and the tower type solar heat recovery device (evaporator) heats the saturated steam. Thus, superheated steam is generated.

  A part of the superheated steam generated by the solar heat collector is supplied to the steam turbine cycle side, and the steam turbine generator is rotated to generate electric power. At the same time, the remainder is supplied to the solar heat storage and heat dissipation device side. In the solar thermal power generation plant of the embodiment of the present invention, paying attention to the fact that the heat medium for recovering solar heat and recovering the heat radiation from the solar heat storage and heat dissipation device is the same water / steam as the heat medium of the steam turbine cycle, It constitutes a new heat medium cycle that efficiently stores and dissipates solar heat.

  That is, for the heat storage of solar heat, the superheated steam (primary heat medium) sent to the solar heat storage / heat dissipating device side is heat-exchanged with the molten salt or oil which is the secondary heat medium, and is stored in the molten salt or oil. In the present invention, in the process from the superheated steam to the water having a temperature lower than the saturation temperature, the heat storage of the solar heat collecting apparatus stores heat in a plurality of solar heat storage heat dissipation heat transfer medium tanks in a plurality of temperature regions according to the state of water / steam. To do. In an embodiment of the present invention, a steam heat exchanger, a saturated steam condenser, and a saturated water heat exchanger are provided, and the sensible heat energy of the steam is recovered in the process from the superheated steam to the saturated steam in the steam heat exchanger. In the saturated steam condenser, the heat energy of condensation latent heat is recovered in the process from saturated steam to saturated water, and in the saturated water heat exchanger, the sensible heat of water is recovered in the process from saturated water to water lower than the saturation temperature. Heat energy is recovered. Then, in the steam heat exchanger, saturated steam condenser, and saturated water heat exchanger, the secondary heat medium heated to three temperature regions of high temperature, medium temperature, and low temperature, respectively, is a high temperature heat storage heat radiation tank, medium temperature heat storage The solar heat storage and heat dissipation device is configured to store solar heat in a plurality of temperature regions, housed in each of the heat dissipation tank and the low-temperature heat storage and heat dissipation tank. And the cooled water (primary heat medium) which came out of the saturated water heat exchanger is made to flow into the deaerator of the condensate / feed water system on the side corresponding to the steam turbine cycle as described above. .

  In addition, for heat dissipation from the solar heat storage and heat dissipation device, the water supplied from the condensate / water supply system water supply pump on the side corresponding to the steam turbine cycle is finally exchanged with the secondary heat medium of the solar heat storage and heat dissipation device. To generate superheated steam and supply it to the steam turbine. In an embodiment of the present invention, a saturated water heat exchanger, a saturated water evaporator, and a steam heat exchanger are provided, and in the saturated water heat exchanger, the water supply from the corresponding side of the steam turbine cycle is heated to near the saturated water temperature. Then, the saturated water evaporator changes the phase from saturated water (liquid phase) to saturated steam (gas phase), the steam heat exchanger superheats the saturated steam to superheated steam, and supplies the superheated steam to the steam turbine. To do. Saturated water heat exchangers, saturated water evaporators, and steam heat exchangers are supplied with secondary heat media that are housed in low-temperature heat storage and heat dissipation tanks, medium-temperature heat storage and heat-release tanks, respectively. Thus, the heat energy stored in the daytime is used in each secondary heat medium.

  Furthermore, the solar thermal power generation plant of the Example of this invention, when a molten salt is employ | adopted as a secondary heat medium (solar heat storage thermal radiation heat medium), molten salt solidification prevention using solar heat as solidification prevention heat by the temperature fall of molten salt Equipment.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS. 1 to 4b, FIG. 7 and FIG. A present Example is a medium-sized solar thermal power generation plant provided with the solar thermal storage heat dissipation device which can generate electric power only by solar thermal energy not only in the daytime but also at nighttime. The medium size here means that the nominal output of the solar thermal power plant is about 50 MWe class to 250 MWe class. The present embodiment can also be applied to a solar thermal power plant that is slightly below or slightly above this output.

  FIG. 1 shows the overall configuration of a medium-sized solar power plant according to this embodiment.

  The medium-sized solar thermal power generation plant of this example is mainly composed of a solar thermal collector, a steam turbine power generation facility, and a solar thermal storage / heat dissipation device. Water / steam is used as a heat medium (primary heat medium = tertiary heat medium) flowing through the solar heat collector and the steam turbine power generation facility. In addition, as a heat storage heat dissipation heat medium (secondary heat medium) for solar heat storage and heat dissipation devices that store or dissipate solar heat by exchanging heat with the primary heat medium, melting of sodium nitrate, potassium nitrate, etc., which is generally put to practical use A salt or a high-temperature heat medium oil (for example, trade name “Hi-therm” of JX Nippon Oil & Energy Corporation) is used.

  The solar heat collector is mainly composed of a solar primary evaporator 142 and solar secondary evaporator 144 which are trough type or Fresnel type solar heat recovery devices installed on the ground, and a tower type superheater which is a tower type solar heat recovery device. A heat collector 21 and a tower-type reheat collector 25 are provided. The solar heat primary evaporator 142 and the solar heat secondary evaporator 144 are provided with a solar heat primary evaporator heat collection tube 143 and a solar heat secondary evaporator heat collection tube 145, respectively. The tower-type overheat collector 21 and the tower-type reheat collector 25 collect sunlight using a heliostat (plane mirror) 23 installed on the ground.

  The steam turbine power generation facility includes a high-pressure steam turbine 1, an intermediate-pressure steam turbine 2, a low-pressure steam turbine 3, and a steam turbine generator 4 as main components, and also includes a low-pressure steam turbine condenser 10, a condensate pump 13, A condensate / water supply system including a low-pressure feed water heater 14, a deaerator 15, a feed water pump (solar heat collector feed water pump) 16, a high-pressure feed water heater 17 and the like is provided. A condenser cooling water pipe 11 is attached to the low pressure steam turbine condenser 10. Further, the extraction steam is supplied from the low pressure steam turbine 3 to the low pressure feed water heater 14 via the low pressure feed water heater extraction pipe 30, and the deaerator 15 is supplied from the intermediate pressure steam turbine 2 to the degasification extraction pipe 29. The extracted steam is supplied to the high pressure feed water heater 17 from the intermediate pressure steam turbine 2 through the high pressure feed water heater bleed pipe 28 and the exhaust steam from the high pressure steam turbine 1 through the low temperature reheat bleed pipe 27. Have been supplied. Such extraction heating is an example, and the present invention is not limited to this.

  The main components of the solar heat storage and heat dissipation device are a steam heat exchanger 33, a saturated steam condenser 34, a saturated water heat exchanger 35, a saturated water evaporator 38, a low temperature heat storage and heat dissipation tank 52, a medium temperature heat storage and heat dissipation tank 53, and a high temperature. A heat storage / radiation tank 56 is provided.

  Next, while explaining the flow of each heat medium in the solar heat collector, steam turbine power generation facility, and solar heat storage heat dissipation device, the configurations of the solar heat collection device, steam turbine power generation facility, and solar heat storage heat dissipation device will be described.

  As shown in FIG. 1, the feed water exiting the high pressure feed water heater 17 passes through the high pressure feed water heater outlet feed pipe 45, then passes through the brackish water separator water tank inlet valve 51, and enters the brackish water separator water tank inlet A pipe 47 flows into the brackish water separator water storage tank 18. The solar heat collector supply water that has exited the brackish water separator storage tank 18 is boosted by the solar evaporator circulation pump 20 and sent to the solar primary evaporator 142. The feed water partially evaporated by the solar primary evaporator 142 passes through the solar primary evaporator heat collecting pipe 143, is sent to the solar secondary evaporator 144, and is further heated. The brackish water mixed fluid evaporated by the solar secondary evaporator 144 passes through the solar secondary evaporator heat collecting pipe 145 and flows down to the brackish water separator 19. Here, the brackish water mixed fluid is separated into saturated steam and saturated water drain, and the saturated water drain falls into the separator water storage tank 18 and is stored. On the other hand, the saturated steam is sent to the tower-type superheat collector 21 through the tower-type superheater heat collector inlet pipe 8 and heated to become superheated steam. Thus, in this embodiment, the generation of saturated steam and the generation of superheated steam are performed in a plurality of stages. By providing the primary heat medium as saturated steam before sending it to the tower-type superheat collector 21, it is not necessary to provide a large tower-type solar heat recovery device as the tower-type superheat collector 21.

  The superheated steam generated by the tower-type superheat collector 21 is divided into the main steam switching valve 6 side and the steam heat exchanger inlet valve 41 side during the heat storage operation via the tower-type superheater collector outlet pipe 5. .

  During the daytime, when the steam turbine is driven to generate power, the main steam switching valve 6 is opened, and the superheated steam generated by the solar heat collector is supplied to the steam turbine power generation equipment. The superheated steam that has passed through the main steam switching valve 6 is supplied to the high-pressure steam turbine 1 through the high-pressure steam turbine inlet pipe 7 to perform work. The steam that has driven the high-pressure steam turbine 1 passes through the tower-type reheat collector inlet pipe 24, is reheated by the tower-type reheat collector 25, and the steam temperature rises again. The reheat steam is supplied to the intermediate pressure steam turbine 2 through the high temperature reheat pipe 26, and the steam after driving the intermediate pressure steam turbine 2 is supplied to the low pressure steam turbine 3 to perform work. A steam turbine generator 4 connected to the high-pressure steam turbine 1, the intermediate-pressure steam turbine 2, and the low-pressure steam turbine 3 is rotated by these steam turbines to generate electric power. The steam that has driven the low-pressure steam turbine 3 passes through the low-pressure steam turbine exhaust pipe 9 and enters the low-pressure steam turbine condenser 10 to be returned to the condensate. Although FIG. 1 shows an example in which condenser cooling water is used as a cooling method for the condenser, an air-cooled condenser may be used. The condensate that has passed through the condenser outlet condensate pipe 12 is pressurized by a condensate pump 13, heated by a low-pressure feed water heater 14, and then sent to a deaerator 15. In the deaerator 15, hot water discharged from a saturated water heat exchanger outlet valve 36, which will be described later, is recovered by a deaerator drain recovery pipe 44 during a heat storage operation. Moreover, feed water from the deaerator 15 is sent again to the solar heat collector side by a solar heat collector water feed pump (steam turbine feed pump) 16.

  On the other hand, when storing solar heat in the daytime, the steam heat exchanger inlet valve 41 during the heat storage operation is opened, and a part of the superheated steam recovered and generated by the solar heat collector is shunted to the side of the solar heat storage and heat dissipation device To supply. The superheated steam that has passed through the steam heat exchanger inlet valve 41 during the heat storage operation flows down to the steam heat exchanger 33 through the steam heat exchanger inlet connection pipe 43 during the heat storage operation and the steam heat exchanger inlet valve 32 during the heat storage operation. I will do it. In the steam heat exchanger 33, heat exchange is performed between the superheated steam and the molten salt for high-temperature heat storage housed in a high-temperature heat storage heat radiation tank 56 described later. Heat exchange is performed by the steam heat exchanger 33, and the superheated steam becomes saturated steam, which flows from the steam heat exchanger 33 into the saturated steam condenser 34. In the saturated steam condenser 34, heat exchange is performed between the saturated steam and the molten salt for medium temperature heat storage stored in the medium temperature heat storage heat radiation tank 53 described later. The saturated steam is cooled by the saturated steam condenser 34 and is changed into saturated water, that is, a phase change from gas to liquid, becomes saturated drain, and flows into the saturated water heat exchanger 35. In the saturated water heat exchanger 35, heat is exchanged between the saturated water and the heat medium oil for low-temperature heat storage housed in a low-temperature heat storage heat radiation tank 52 described later. The saturated water is cooled to water having a temperature lower than the saturation temperature by the saturated water heat exchanger 35, passes through the saturated water heat exchanger outlet valve 36, and is upstream of the feed water heater of the condensate / feed water system (this embodiment). Then, it is recovered by the deaerator 15). As described above, in this embodiment, the superheated steam generated by the solar heat collecting apparatus reaches a plurality of temperature regions (in this embodiment, high temperature and medium temperature depending on the state of water / steam in the process of reaching water having a temperature lower than the saturation temperature. In the low temperature three regions), heat is stored in a plurality of solar heat storage heat dissipation heat medium tanks.

  An outline of the flow of the heat medium in the heat radiation operation will be described. The feed water that has exited the high-pressure feed water heater outlet feed pipe 45 passes through the feed water pipe 46 during the heat radiation operation, flows down the saturated water heat exchanger inlet valve 37 during the heat radiation operation, and flows into the saturated water heat exchanger 35. In the saturated water heat exchanger 35, heat exchange is performed with the water supply and the heat medium oil stored in a low-temperature heat storage and heat radiation tank 52 described later. The feed water is heated by the saturated water heat exchanger 35 to the vicinity of the saturated water temperature at the pressure boosted by the water absorption pump 16 and flows into the saturated water evaporator 38. In the saturated water evaporator 38, heat exchange is performed between the saturated water and the stored molten salt stored in the intermediate-temperature heat storage heat radiation tank 53 described later. The saturated water is heated in the saturated water evaporator 38 to become saturated steam, and flows into the steam heat exchanger 33. In the steam heat exchanger 33, heat exchange is performed between the saturated steam and the stored molten salt stored in a high-temperature heat storage and heat radiation tank 56 described later. The saturated steam is superheated in the steam heat exchanger 33 to become superheated steam, and the steam heat exchanger outlet valve 40 during the heat radiation operation, the steam heat exchanger outlet connection pipe 42 during the heat radiation operation, and the high pressure steam turbine inlet pipe joint valve during the heat radiation operation. It passes through 107 and joins the high-pressure steam turbine inlet pipe 7 to be supplied to the high-pressure steam turbine 1.

  Next, details of the solar heat storage and heat dissipation device will be described with reference to FIGS.

  The description will be divided into the structure on the heat storage operation side and the structure on the heat radiation operation side. First, the configuration of the heat storage operation side will be described with reference to FIGS. 2, 3a and 3b.

  The configuration on the heat storage operation side in the solar heat storage / heat dissipating device of the present embodiment consists of a steam heat exchanger 33, a saturated steam condenser 34, a saturated water heat exchanger 35, a high temperature heat storage / radiation tank 56, a medium temperature heat storage / radiation tank 53, a low temperature heat storage. A secondary heat medium provided with a heat radiating tank 52 and heated to three temperature regions of high temperature, medium temperature, and low temperature in the steam heat exchanger 33, the saturated steam condenser 34, and the saturated water heat exchanger 35 is a high temperature. It is accommodated in each of the heat storage and heat radiation tank 56, the medium temperature heat storage and heat radiation tank 53, and the low temperature heat storage and heat radiation tank 52, and is configured to store solar heat in a plurality of temperature regions.

  The steam heat exchanger 33 performs heat exchange between the primary heat medium (steam) of the solar heat collector and the steam turbine power generation facility and the molten salt accommodated in the high-temperature heat storage / radiation tank 56. As shown in FIG. 3 b, there is a low-temperature molten salt for high-temperature heat storage at the lower part of the high-temperature heat storage heat radiation tank 56. The low-temperature molten salt is taken out from the high-temperature heat storage / radiation tank molten salt take-out pipe 88 by the high-temperature heat storage / radiation tank molten salt transfer pump 59, pressurized, and sent to the steam heat exchanger 33 through the molten salt pipe 64. On the other hand, the superheated steam that has passed through the steam heat exchanger inlet valve 32 during the heat storage operation flows through the steam heat exchanger heating pipe 48 in the steam heat exchanger 33. The low-temperature molten salt is heated and heated by superheated steam via the steam heat exchanger heating pipe 48 in the steam heat exchanger 33 and passes through the molten salt pipe 65 and the high-temperature heat storage heat radiation tank molten salt return pipe 91. Then, it is sent to and stored in the upper part of the high-temperature heat storage / radiation tank 56. On the other hand, the primary heat medium that has been changed from superheated steam to saturated steam in the steam heat exchanger 33 passes through the steam heat exchanger-saturated steam condenser connecting pipe 78 from the steam heat exchanger heating pipe 48, and is saturated steam condensate. It is sent to the steam spray mother pipe 80 of the saturated steam condenser 34 through the inlet pressure regulating valve 79.

  The saturated steam condenser 34 performs heat exchange between the saturated steam from the steam heat exchanger 33 and the molten salt accommodated in the intermediate temperature heat storage and heat radiation tank 53. As shown in FIG. 3 b, there is a molten salt for low temperature medium temperature heat storage at the bottom of the medium temperature heat storage heat radiation tank 53. The low-temperature molten salt is taken out from the intermediate-temperature heat storage / radiation tank molten salt take-out pipe 87 by the medium-temperature heat storage / radiation tank molten salt transfer pump 58, and is pressurized to be saturated via the molten salt pipe 62. It is sent to the water condenser cooling pipe 132. The low-temperature molten salt is heated in the saturated steam condenser 34 through the saturated steam condenser cooling pipe 132 by the latent heat of the saturated steam, and the temperature is raised. It passes through the heat storage heat radiation tank molten salt return pipe 90 and is sent to the upper part of the intermediate temperature heat storage heat radiation tank 53 for storage. On the other hand, the saturated steam is jetted into the saturated steam condenser 34 from a saturated steam jet nozzle 81 attached to the steam spray mother pipe 80. The saturated steam is cooled in the saturated steam condenser 34 to become saturated water (drain), passes through the saturated steam condenser-saturated water heat exchanger connection pipe 82, and passes through the saturated steam condenser water level adjustment valve 83. It is sent to the saturated water heat exchanger heating tube 84 in the saturated water heat exchanger 35. Details of the configuration of the saturated steam condenser 34 will be described later with reference to FIG.

  The saturated water heat exchanger 35 performs heat exchange between the saturated water from the saturated steam condenser 34 and the heat medium oil accommodated in the low-temperature heat storage heat radiation tank 52. As shown in FIG. 3 b, there is a low-temperature heat medium oil below the low-temperature heat storage and heat radiation tank 52. The low-temperature heat medium oil is extracted from the low-temperature heat storage / radiation tank oil take-out pipe 86 by the low-temperature heat storage / radiation tank oil transfer pump 57, is pressurized, and is sent to the saturated water heat exchanger 35 via the oil pipe 60. On the other hand, the saturated water flows in the saturated water heat exchanger heating pipe 84 in the saturated water heat exchanger 35. The low temperature heat medium oil is heated and heated by the sensible water of the saturated water via the saturated water heat exchanger heating pipe 84 in the saturated water heat exchanger 35, and the oil pipe 61, the low temperature heat storage heat radiating tank heat medium oil return pipe. After passing through 89, it is sent to and stored in the upper part of the low-temperature heat storage and heat radiation tank 52. On the other hand, the water (primary heat medium) having a temperature lower than the saturation temperature in the saturated water heat exchanger 35 is the saturated water heat exchanger outlet pipe 85, the saturated water heat exchanger outlet valve 36, and the deaerator drain during heat storage operation. It passes through the collection pipe 44 and is sent to the deaerator 15.

  In this embodiment, as shown in FIG. 3b, the heat storage and heat radiation tanks (low temperature heat storage and heat radiation tank 52, medium temperature heat storage and heat radiation tank 53, and high temperature heat storage and heat radiation tank 56) provided corresponding to each temperature region are stored in one tank. The equipment is simplified by disposing a heat insulating member on the upper side, accommodating a high-temperature heat storage medium stored by heat exchange on the upper side, and storing a low-temperature heat storage medium radiated by heat exchange on the lower side. At the start of the heat storage operation, the cold / heat storage medium is located at the lower part of each tank and taken out by each oil transfer pump, and at the end of the heat storage operation, it is located at the upper part of each tank. In addition, although the equipment cost increases, each heat storage and heat radiation tank is divided into two tanks, which are divided into a tank that stores the stored high-temperature heat storage medium and a tank that stores the heat-transferred cold storage medium. May be. In this case, since there is no movement of heat transmitted through the heat insulating member found in one heat storage and heat radiation tank, the heat energy loss can be reduced.

  Next, the configuration of the heat radiation operation side will be described with reference to FIGS. 2, 4a and 4b. In this embodiment, since heat storage is performed in three temperature regions, heat generation is performed in a plurality of stages corresponding to the three temperature regions, and superheated steam is generated by heat dissipation. In the solar heat storage and heat dissipation device of this embodiment, the configuration on the heat dissipation operation side uses a saturated water evaporator 38 instead of the saturated steam condenser 34, and the other configuration is the same on the heat storage operation side. It is not essential to share equipment with the heat storage operation side, but it is desirable to share equipment from the viewpoint of facility costs.

  The saturated water heat exchanger 35 as a configuration of the heat radiation operation side performs heat exchange between the heat medium oil in the low-temperature heat storage heat radiation tank 52 and the water supplied from the condensate / water supply system of the steam turbine power generation facility. The high-temperature heat medium oil located at the upper part of the low-temperature heat storage and heat radiation tank 52 is taken out from the high-temperature heat medium oil take-out pipe 92 during heat radiation operation and merged with the low-temperature heat storage and heat-release tank oil take-out pipe 86. The pressure is increased at 57 and sent to the saturated water heat exchanger 35 via the oil pipe 60. On the other hand, the water supply from the condensate / water supply system water supply pump (solar heat collector water supply pump) 16 of the steam turbine power generation facility passes through the water supply pipe 46 during the heat radiation operation and the saturated water heat exchanger inlet valve 37 during the heat radiation operation. It flows in the preheating pipe 130 during the heat radiation operation in the saturated water heat exchanger 35. The high-temperature heat medium oil heats the feed water to near the saturated water temperature in the saturated water heat exchanger 35 via the preheating pipe 130 during the heat radiation operation. The heated feed water (saturated water) passes through the saturated water heat exchanger-saturated water evaporator drum connecting pipe 102 and is sent to the saturated water evaporator drum 103. On the other hand, the high-temperature heat medium oil is cooled in the saturated water heat exchanger 35 to become a low temperature, passes through the oil pipe 61 and the high-temperature heat medium oil return pipe 95 during heat radiation operation, and is sent to the lower part of the low-temperature heat storage and heat radiation tank 52. Stored.

  The saturated water evaporator 38 performs heat exchange between the molten salt in the intermediate temperature heat storage and heat radiation tank 53 and the feed water (saturated water) heated to near the saturation temperature. The stored molten salt for intermediate temperature heat storage (intermediate temperature molten salt) located at the upper part of the intermediate temperature heat storage heat radiation tank 53 is taken out from the intermediate temperature molten salt takeout pipe 93 during the heat radiation operation and merged into the intermediate temperature heat storage heat radiation tank molten salt takeout pipe 87. Then, the pressure is increased by the intermediate temperature heat storage heat radiation tank molten salt transfer pump 58 and sent to the saturated water evaporator 38 via the molten salt pipe 62. On the other hand, the saturated water sent to the saturated water evaporator drum 103 flows in the saturated water evaporator pipe 104 in the saturated water evaporator 38 by natural circulation force. The intermediate temperature molten salt heats the saturated water in the saturated water evaporator 38 via the saturated water evaporator tube 104. The heated saturated water becomes steam and is taken out as saturated steam from the saturated steam generator drum 103, passes through the saturated steam pipe 105, and is sent to the superheat pipe 131 during the heat radiation operation in the steam heat exchanger 33. On the other hand, the intermediate temperature molten salt is cooled in the saturated water evaporator 38 and becomes low temperature.

  The steam heat exchanger 33 performs heat exchange between the molten salt in the high-temperature heat storage and heat radiation tank 56 and the saturated steam. The stored molten salt for high-temperature heat storage (high-temperature molten salt) located at the upper portion of the high-temperature heat storage and radiation tank 56 is taken out from the high-temperature molten salt take-out pipe 94 during heat radiation operation and merged into the high-temperature heat storage and heat-release tank molten salt take-out pipe 88. The pressure is increased by a high-temperature heat storage heat radiating tank molten salt transfer pump 59 and sent to the steam heat exchanger 33 through the molten salt pipe 64. On the other hand, the saturated steam taken out from the saturated steam generator drum 103 flows in the superheat pipe 131 during the heat radiation operation in the steam heat exchanger 33. The high-temperature molten salt superheats the saturated steam in the steam heat exchanger 33 via the superheat pipe 131 during the heat radiation operation. The superheated steam passes the steam heat exchanger outlet valve 40 during the heat radiation operation from the superheat pipe 131 during the heat radiation operation, and is finally sent to the high-pressure steam turbine 1. On the other hand, the high-temperature molten salt is cooled in the steam heat exchanger 33 to become a low temperature, passes through the molten salt pipe 65 and the high-temperature molten salt return pipe 97 at the time of heat radiation operation, and is sent and stored in the lower part of the high-temperature heat storage and heat radiation tank 56.

  FIG. 4 b shows the position of each heat storage medium in each heat storage heat radiation tank during the heat radiation operation for each operation period. At the start of the heat radiation operation, the high-temperature heat storage medium is located at the upper part of each heat storage and heat radiation tank, taken out by each oil transfer pump, and at the end of the heat radiation operation, located at the lower part of each heat storage and heat radiation tank.

  In this embodiment, a molten salt that is generally proven and used is used as the heat storage medium of the high-temperature and medium-temperature heat storage heat radiation tanks. May be used.

  In addition, when a molten salt is used as a heat storage medium as in this embodiment, the molten salt has a property of becoming a solid when it is below a certain melting point (generally about 230 ° C. depending on the constituent components of the molten salt). It is preferable to take measures to prevent solidification of the molten salt. In other words, when the molten salt cannot receive solar thermal energy at night or when the plant is shut down, if the temperature falls below the melting temperature of the molten salt, the molten salt solidifies from a liquid to a solid and flows in the tank or piping of the solar thermal storage and heat dissipation device. May be disturbed. Therefore, in order to prevent the molten salt from being cooled and solidified below the melting temperature, it is desirable to provide a heating system that warms the molten salt and always maintains a temperature above the melting point of the molten salt. In order to realize a heating system, an auxiliary boiler or an electric heater that generates water vapor used for heating the molten salt may be provided, but the equipment cost and operation cost increase. Increases boiler fuel costs and produces new emissions of toxic oxides by burning fossil fuels. Therefore, in this embodiment, high-temperature heat medium oil is used as a heating heat medium so that the molten salt does not fall below the melting point (for example, 230 ° C.), and the high-temperature heat medium oil is heated and stored with solar heat. In addition, the heat is used to heat each molten salt in the high-temperature and medium-temperature heat storage heat radiation tanks. The thermal storage heating system in a present Example is demonstrated in detail using FIG.

  A part of the superheated steam generated in the solar heat collector passes through a heat medium oil tank heating pipe 77 and a heat medium oil tank inlet valve 73 branched from the steam heat exchanger inlet connection pipe 43 during the heat storage operation, and the high temperature heat medium oil. It is supplied to the tank 66 side. The superheated steam that has passed through the heat medium oil tank inlet valve 73 flows through the heat medium oil tank heater 74 provided in the high temperature heat medium oil tank 66 and passes through the heat medium oil tank heater 74. The heat medium oil stored in the tank 66 is heated to raise its temperature. The steam cooled by the heat medium oil tank heater 74 and having a low temperature passes through the heat medium oil tank heat steam outlet valve 75 and is collected in the deaerator 15.

  The high temperature heat medium oil stored in the high temperature heat medium oil tank 66 passes through the heat medium oil transfer pump inlet valve 67, is pressurized by the oil transfer pump 68, passes through the oil transfer pump outlet valve 69, and is stored at a medium temperature. The heat medium oil distribution valve 70 exits the heat radiating tank and is sent to a heater 54 installed in the medium temperature heat storage heat radiating tank 53 to heat the low temperature molten salt and prevent the molten salt for medium temperature heat storage from solidifying. The cold heat medium oil cooled by exchanging heat with the low temperature molten salt in the heater 54 passes through the intermediate temperature heat storage heat radiation tank oil return valve 76 and is collected in the high temperature heat medium oil tank 66.

  Further, part of the high-temperature heat medium oil that has passed through the oil transfer pump outlet valve 69 exits the high-temperature heat storage / radiation tank side heat medium oil distribution valve 71 and is sent to the heater 55 installed in the high-temperature heat storage / radiation tank 56. The low temperature molten salt is heated to prevent the molten salt for high temperature heat storage from solidifying. The cold heat medium oil cooled by exchanging heat with the low temperature molten salt in the heater 55 passes through the high temperature heat storage heat radiating tank oil return valve 72 and is collected in the high temperature heat medium oil tank 66.

  In addition, as for the high temperature heat medium oil tank 66, in this embodiment, as shown in FIGS. 3b and 4b, a heat insulating member is disposed in one tank, and a high temperature heat storage medium that stores heat by heat exchange is disposed on the upper side. A low-temperature heat storage medium that is accommodated and radiated by heat exchange is accommodated in the lower part. The high-temperature heat medium oil tank 66 may be divided into two tanks as in the above-described heat storage and heat radiation tank.

  According to the present embodiment, since the primary heat medium for solar heat recovery and the third heat medium driven by the steam turbine are used as a common heat medium, the heat medium cycle is simplified, and the equipment can be simplified and the equipment cost can be reduced. It becomes. Furthermore, since solar heat is stored according to the state of water / water vapor used as the primary heat medium, it is possible to efficiently store solar heat.

  Furthermore, in this embodiment, as the primary heat medium for solar heat recovery, the same water / steam as that of a general boiler feed water having a viscosity lower than that of oil is used without using a special heat medium oil having a high temperature specification. Therefore, the required power of the feed water pump that supplies the primary heat medium to the solar heat collector can be reduced. As a result, the in-house power of the solar thermal power plant can be reduced. In addition, the solar heat collecting apparatus is an enormous amount of equipment, but if heat medium oil is distributed throughout the equipment, the risk of fire due to leakage of the heat medium piping increases. If water / steam is used as the primary heat medium as in this embodiment, there is no concern.

  A second embodiment of the present invention will be described with reference to FIGS. A present Example is a small solar thermal power generation plant provided with the solar thermal thermal storage heat dissipation apparatus which can generate electric power not only in the daytime but also at night mainly with only solar thermal energy. The small size mentioned here means that the nominal output of the solar thermal power plant is about 1 MWe class to 50 MWe class. The present embodiment can also be applied to a solar thermal power plant that is slightly below or slightly above this output.

  FIG. 5 shows the overall configuration of the small solar power plant according to this embodiment. The overall configuration of the small solar power plant of the present embodiment is basically the same as the overall configuration of the medium solar thermal power plant of the first embodiment. The same code | symbol is attached | subjected about the same structure as the medium-sized solar power generation plant of Example 1 of FIG. 1, and those detailed description is abbreviate | omitted.

  In the present embodiment, unlike the first embodiment, the steam turbine of the steam turbine power generation facility is configured by only the small steam turbine 120. In such a small steam turbine power generation facility, the high-pressure feed water heater 17 in Example 1 is not provided, and relatively high temperature feed water cannot be sent to the solar heat collector side. A solar preheater 140 is provided. Moreover, since it is a small solar thermal power generation plant, a trough type or a Fresnel type solar heat recovery device is used as a solar heat collection device without using a tower type solar heat recovery device that is a relatively large facility. Moreover, about the heat medium of a solar heat storage thermal radiation apparatus, the heat medium oil which does not require the heating system for solidification prevention is used for the heat medium which stores heat of each temperature range.

  The small solar thermal power generation plant of this example is also mainly composed of a solar thermal collector, a steam turbine power generation facility, and a solar thermal storage and heat dissipation device, and they are shared as a heat medium flowing through the solar thermal collector and the steam turbine power generation facility. Water / steam is used as (primary heat medium = tertiary heat medium).

  The steam turbine power generation facility mainly includes a small steam turbine 120 and a small steam turbine generator 121, a small condenser 123, a small condensate pump 124, a small low-pressure feed water heater 125, and a small deaerator. 126, and a condensate / water supply system including a water supply pump (small solar heat collector water supply pump) 128 and the like. The small condenser 123 condenses the exhaust steam flowing through the small steam turbine exhaust pipe 122 by an air cooling method. In addition, extraction steam is supplied to the small low pressure feed water heater 125 and the small deaerator 126 from the small steam turbine 120 through the low pressure feed water heater extraction pipe 30 and the deaerator extraction pipe 29, respectively. Such extraction heating is an example, and the present invention is not limited to this. Moreover, the water which became low temperature from the saturation temperature discharged | emitted from a solar thermal storage heat radiation apparatus at the time of a thermal storage driving | operation is returned to the small deaerator 126 in a present Example.

  The solar heat collector mainly includes a solar preheater 140 that is a trough type or Fresnel type solar heat recovery device installed on the ground, a solar primary evaporator 142, and a solar superheater 148, and includes a solar primary evaporator. A solar saturated steam drum 146 is attached to 142. The solar preheater 140, the solar primary evaporator 142, and the solar superheater 148 are provided with a solar preheater heat collector 141, a solar primary evaporator heat collector 143, and a solar superheater heat collector 149, respectively. As described above, in the case of a small steam turbine, only the feed water can be heated by the small deaerator 126. Therefore, in order to heat the feed water sent from the small solar heat collecting device feed water pump 128 by solar heat, solar heat preheating is performed. A container 140 is provided. Water supplied from the solar preheater 140 passes through the solar preheater heat collecting tube 141 and flows into the solar primary evaporator 141 to become mostly saturated steam, and the primary heat medium containing the saturated steam is the solar primary evaporator collector. It passes through the heat pipe 143 and is put into the solar saturated steam drum 146. Here, brackish water is separated into saturated steam and saturated water, and the saturated water is recirculated by the solar evaporator circulation pump 20, and a lot of saturated steam is introduced into the solar superheater 148 and superheated to become superheated steam. The generated superheated steam passes through the solar heat superheated steam collecting pipe 149, flows in the solar heat superheater outlet pipe 150, and is sent to the inlet pipe of the main steam switching valve 6.

  The solar heat storage and heat dissipation device has basically the same configuration as that of the first embodiment. The main difference is that oil is used as a heat medium accommodated in the high temperature heat storage and heat dissipation tank 301, the medium temperature heat storage and heat dissipation tank 302, and the low temperature heat storage and heat dissipation tank 303. It is used, and a heating system for preventing heat medium solidification is not provided.

  When performing daytime power generation, the main steam switching valve 6 is opened and superheated steam is supplied to the small steam turbine 120. When heat storage is performed, the steam heat exchanger side branch valve 41 is opened and superheated steam is supplied to the solar heat storage and heat dissipation device side. In addition, each operation of heat storage and heat dissipation is basically the same as that of the first embodiment, and detailed description thereof is omitted.

  In this embodiment, basically the same effects as those in the first embodiment can be obtained.

  Next, the structural example of the saturated steam condenser installed in common with Example 1 and 2 is demonstrated using FIG.

  The saturated steam that has exited the steam heat exchanger 33 is reduced in pressure by a saturated steam condenser inlet pressure regulating valve 79, flows in the steam spray mother pipe 80, and is installed at the bottom of the saturated steam condenser 34. Spray from the saturated steam jet nozzle 81 to the bottom of the saturated steam condenser 34 in a fine bubble state. Cooling the saturated steam that has passed through a number of fine spray nozzle holes 401 of the ejection nozzle 81 by flowing a low-temperature medium-temperature heat storage heat medium sent from the medium-temperature heat storage heat radiation tank 53 into the saturation steam condenser cooling pipe 132 And change to saturated water. The saturated water increasing in the saturated steam condenser 34 passes through the saturated steam condenser water level adjustment valve 83 and is discharged to the saturated water heat exchanger 35. The low-temperature molten salt taken out by the intermediate-temperature heat storage / radiation tank molten salt take-out pipe 87 passes through the molten salt transfer pump inlet valve 405 and is pressurized by the intermediate-temperature heat storage / radiation tank molten salt transfer pump 58 to check the molten salt transfer pump outlet. The saturated steam is cooled by passing through the valve 406 and the molten salt transfer pump outlet valve 407 and entering the saturated steam condenser cooling pipe 132. The molten salt that has been heated to an intermediate temperature passes through the intermediate-temperature heat storage / radiation tank molten salt return pipe 90 and returns to the upper portion of the intermediate-temperature heat storage / radiation tank 53. While the saturated steam condenser 34 is in operation, the water level of the saturated steam condenser 34 is controlled by the saturated steam condenser water level adjustment valve 83 based on the detection signal of the saturated steam condenser water level meter 403. . The saturated steam condenser inlet pressure regulating valve 79 controls the saturated steam spray pressure to a constant level based on the detection signal of the steam spray mother pipe pressure gauge 402.

  Next, an example of solar thermal management applied to the solar thermal power plant of the present invention will be described with reference to FIG.

  FIG. 8 shows the concept of solar thermal management applied to the solar thermal power plant of the first embodiment. With this solar thermal management, it is possible to generate electricity during the daytime and carry out a heat storage operation, and to generate electric power with solar heat during the time when the required solar heat intensity cannot be obtained by the thermal energy, such as in the evening, early morning or night.

The main aspects of the present invention are summarized as follows.
(1) A heat medium (primary heat medium: water / steam) is used in common and a solar heat collection cycle (solar heat collection heat medium cycle) and a steam turbine cycle (steam turbine steam cycle) are connected to form one cycle (union). Solar heat collection from the side corresponding to the solar heat collection cycle (solar heat collection device) to the side corresponding to the steam turbine cycle (steam turbine power generation equipment) and / or from the side corresponding to the steam turbine cycle. On the way to the side corresponding to the heat cycle, the primary heat medium is branched to exchange heat with the heat medium (secondary heat medium) of the solar heat storage and heat dissipation device.
(2) In (1), the primary heat medium that has been cooled by heat exchange with the heat medium of the solar heat storage / heat dissipating device to become water is used for the condensate / water supply system on the side corresponding to the steam turbine cycle. It flows into the deaerator, for example, upstream of the high-pressure feed water heater (if there is no high-pressure feed water heater, it flows into the deaerator).
(3) In (1) or (2), at least the generation of saturated steam from the feed water and the generation of superheated steam from the saturated steam as the configuration of the solar heat collector that recovers solar heat to water / steam (primary heat medium) The solar heat is recovered in two stages.
(4) Using water / steam as a heat medium for the solar heat collector, superheated steam is generated by solar heat, and the water / steam is used in the process from the superheated steam to water at a temperature lower than the saturation temperature. The solar heat is stored by exchanging heat with molten salt or oil, which is a heat medium of the solar heat storage device, in a plurality of different temperature ranges according to the state of the heat.
(5) In (4), a steam heat exchanger, a saturated steam condenser, and a saturated water heat exchanger are provided, and the steam heat exchanger recovers sensible heat energy of the steam in the process from superheated steam to saturated steam. In the saturated steam condenser, the heat energy of condensation latent heat is recovered in the process from saturated steam to saturated water, and in the saturated water heat exchanger, the sensible heat of water in the process from saturated water to water lower than the saturation temperature. The heat energy is recovered.
(6) In (5), a saturated water evaporator is further provided. In the saturated water heat exchanger, the feed water from the steam turbine cycle is heated to near the saturated water temperature, and the saturated water (liquid phase) is heated in the saturated water evaporator. To saturated steam (gas phase), and the steam heat exchanger superheats the saturated steam to superheated steam and supplies the superheated steam to the steam turbine. Saturated water heat exchangers, saturated water evaporators, and steam heat exchangers have multiple temperatures as their heating medium, with the use of steam heat exchangers, saturated steam condensers, and saturated water heat exchangers during solar heat storage. A heat medium stored in the region is supplied.
(7) When a molten salt is employed as a secondary heat medium (solar heat storage heat dissipation heat medium) of the solar heat storage heat dissipation device, a molten salt solidification prevention device using solar heat is provided.

  The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  1: High pressure steam turbine, 2: Medium pressure steam turbine, 3: Low pressure steam turbine, 4: Steam turbine generator, 5: Tower-type superheater collector outlet pipe (solar heat collector outlet main steam pipe), 6: Main steam switching valve, 7: High pressure steam turbine inlet pipe, 8: Tower type superheater inlet pipe, 9: Low pressure steam turbine exhaust pipe, 10: Low pressure steam turbine condenser, 11: Condenser cooling water pipe , 12: Condenser outlet condensate piping, 13: Condensate pump, 14: Low pressure feed water heater, 15: Deaerator, 16: Solar heat collector water feed pump, 17: High pressure feed water heater, 18: Brackish water separation Storage tank, 19: brackish water separator, 20: solar evaporator circulation pump, 21: tower type superheat collector, 23: heliostat (plane mirror), 24: tower type reheat collector inlet piping, 25: tower Mold reheat collector, 26: high temperature reheat pipe, 27 Low-temperature reheat bleed pipe, 28: High-pressure feed water bleed pipe, 29: Deaerator bleed pipe, 30: Low-pressure feed water bleed pipe, 32: Steam heat exchanger inlet valve during heat storage operation, 33: Steam heat exchanger 34: saturated steam condenser, 35: saturated water heat exchanger, 36: saturated water heat exchanger outlet valve, 37: saturated water heat exchanger inlet valve during heat radiation operation, 38: saturated water evaporator, 40: heat radiation Steam heat exchanger outlet valve during operation, 41: Steam heat exchanger inlet valve during heat storage operation, 42: Steam heat exchanger outlet connection piping during heat radiation operation, 43: Steam heat exchanger inlet communication piping during heat storage operation, 44: Heat storage Operation deaerator drain recovery pipe, 45: High pressure feed water heater outlet feed pipe, 46: Heat release water feed pipe, 47: Steam water separator water tank inlet pipe, 48: Steam heat exchanger heating pipe, 51: Steam water separator Water storage tank inlet valve, 52: Low temperature heat storage and heat dissipation tank, 53: Medium temperature heat storage and heat dissipation tank , 54: heater, 55: heater, 56: high-temperature heat storage and heat radiation tank, 57: low-temperature heat storage and heat-release tank oil transfer pump, 58: medium-temperature heat storage and heat-release tank molten salt transfer pump, 59: high-temperature heat storage and heat-release tank molten salt transfer pump , 60: oil piping, 61: oil piping, 62: molten salt piping, 63: molten salt piping, 64: molten salt piping, 65: molten salt piping, 66: heat medium oil tank, 67: heat medium oil transfer pump inlet Valve: 68: Oil transfer pump, 69: Oil transfer pump outlet valve, 70: Medium temperature heat storage / radiation tank side heat medium oil distribution valve, 71: High temperature heat storage / radiation tank side heat medium oil distribution valve, 72: High temperature heat storage / radiation tank oil return Valve, 73: heat medium oil tank inlet valve, 74: heat medium oil tank heater, 75: heat medium oil tank heating steam outlet valve, 76: medium temperature heat storage heat radiation tank oil return valve, 77: heat medium oil tank heating pipe, 78: Steam heat exchange -Saturated steam condenser connecting pipe, 79: Saturated steam condenser inlet pressure regulating valve, 80: Steam spray mother pipe, 81: Steam spray nozzle, 82: Saturated steam condenser-Saturated water heat exchanger connecting pipe, 83: Saturated steam condenser water level adjustment valve, 84: Saturated water heat exchanger heating pipe, 85: Saturated water heat exchanger outlet pipe, 86: Low temperature heat storage heat radiation tank oil takeoff pipe, 87: Medium temperature heat storage heat radiation tank molten salt takeout Pipe: 88: High temperature heat storage heat radiation tank molten salt take-out pipe, 89: Low temperature heat storage heat radiation tank heat medium oil return pipe, 90: Medium temperature heat storage heat radiation tank molten salt return pipe, 91: High temperature heat storage heat radiation tank molten salt return pipe, 92: Heat radiation High-temperature heat transfer medium oil take-out pipe during operation, 93: Medium-temperature molten salt take-out pipe during heat dissipation operation, 94: High-temperature molten salt take-out pipe during heat dissipation operation, 95: High-temperature heat medium oil return pipe during heat dissipation operation, 96: Medium temperature melt during heat dissipation operation Salt return pipe, 97: Heat dissipation operation High-temperature molten salt return pipe, 102: saturated water heat exchanger-saturated water evaporator drum connecting pipe, 103: saturated water evaporator drum, 104: saturated water evaporator pipe, 105: saturated steam pipe, 107: high pressure during heat radiation operation Steam turbine inlet piping joint valve, 120: small steam turbine, 121: small steam turbine generator, 122: small steam turbine exhaust pipe, 123: small condenser, 124: small condensate pump, 125: small low pressure feed water heater , 126: small deaerator, 128: small solar heat collector water supply pump, 130: preheating pipe during heat radiation operation, 131: superheat pipe during heat radiation operation, 132: saturated steam condenser cooling pipe, 140: solar preheater, 141: Solar preheater heat collection tube, 142: Solar heat primary evaporator, 143: Solar heat primary evaporator heat collection tube, 144: Solar heat secondary evaporator, 145: Solar heat secondary evaporator heat collection tube, 146: Solar heat saturation steam Drum, 147: solar heat saturated steam pipe, 148: solar heat superheater, 149: solar heat superheater heat collection pipe, 150: solar heat superheater outlet pipe (solar heat collector outlet main steam pipe), 301: high temperature heat storage heat radiation tank, 302: Medium temperature heat storage heat release tank, 303: Low temperature heat storage heat release tank, 401: Spray nozzle hole, 402: Steam spray mother pipe pressure gauge, 403: Saturated steam condenser water level gauge, 405: Molten salt transfer pump inlet valve, 406: Molten salt Transfer pump outlet check valve, 407: Molten salt transfer pump outlet valve.

Claims (15)

A solar heat collector, a steam turbine power generation facility, and a solar heat storage and heat dissipation device,
Water / steam is used as both the heat medium of the cycle forming the solar heat collector and the heat medium of the cycle forming the steam turbine power generation facility, and the cycle of the solar heat collector and the cycle of the steam turbine power generation facility are Concatenate into one cycle,
The water / steam is branched while the water vapor flows from the solar heat collector to the steam turbine power generation facility and / or while the water flows from the steam turbine power generation facility to the solar heat collector, Exchange heat with water / water vapor and the heat medium of the solar heat storage and heat dissipation device to perform heat storage or heat dissipation in the solar heat storage and heat dissipation device,
The heat medium in which the water vapor from the solar heat collecting device is cooled by heat exchange with the heat medium of the solar heat storage / heat dissipating device becomes water, upstream of the feed water heating unit in the condensate / water supply system of the steam turbine power generation facility A solar thermal power plant characterized by being allowed to flow into.   2. The solar thermal power plant according to claim 1, wherein the upstream of the feed water heating unit in the condensate / feed water system of the steam turbine power generation facility is a deaerator.   2. The solar thermal power plant according to claim 1, wherein the solar heat collecting apparatus recovers solar heat by generating saturated steam from water and generating superheated steam from the saturated steam.   2. The solar heat storage heat dissipation device according to claim 1, wherein when the solar heat collected in the heat medium of the solar heat collection device is stored in the heat medium of the solar heat storage heat dissipation device, the heat medium of the solar heat collection device is superheated steam. Heat from the solar heat collecting device so that heat is stored in the heat medium of the solar heat storage heat storage device in a plurality of different temperature regions according to the state of water / steam in the process from water to water at a temperature lower than the saturation temperature. A solar thermal power plant comprising a plurality of heat exchangers for exchanging heat between a medium and a heat medium of the solar heat storage and heat dissipation device.   In Claim 4, The said solar thermal storage heat dissipation apparatus is equipped with a steam heat exchanger, a saturated steam condenser, and a saturated water heat exchanger as the said heat exchanger, In the said steam heat exchanger, it changes from superheated steam to saturated steam. In the process, the sensible heat energy of the steam is recovered, in the saturated steam condenser, the heat energy of the latent heat of condensation is recovered in the process of saturated steam to saturated water, and in the saturated water heat exchanger, the saturated temperature from the saturated water is recovered. A solar thermal power plant that recovers the sensible heat of water in the process of cooler water.   In Claim 5, the heat medium of the said solar thermal storage heat dissipation apparatus which heat-exchanged and stored it with the said steam heat exchanger, the said saturated steam condenser, and the said saturated water heat exchanger is respectively a high temperature thermal storage thermal radiation tank and an intermediate temperature thermal storage thermal radiation tank A solar thermal power plant characterized by being housed in a low-temperature heat storage and heat radiation tank.   In Claim 6, the said solar thermal storage heat dissipation apparatus is equipped with a saturated water evaporator, and heats up the water supply from steam turbine power generation equipment to the saturation water temperature vicinity in the said saturated water heat exchanger, In the said saturated water evaporator A phase change from saturated water to saturated steam is performed, the saturated steam is heated to superheated steam in the steam heat exchanger, and superheated steam is supplied to the steam turbine power generation facility, the saturated water heat exchanger, the saturated steam The water evaporator and the steam heat exchanger are supplied with the heat medium accommodated in the low-temperature heat storage / radiation tank, the medium-temperature heat-storage / radiation tank, and the high-temperature heat-storage / radiation tank, respectively. Solar power plant.   In Claim 1, Molten salt is used as a heat carrier of the solar thermal storage heat dissipation device, It has a heating system which heats molten salt in a tank which stores the molten salt using solar heat accumulated in an oil medium. A featured solar thermal power plant. To a solar thermal power generation plant having a solar heat collector that generates superheated steam using water / steam as a primary heat medium, and a steam turbine power generation facility that generates power by introducing the superheated steam generated in the solar heat collector into a steam turbine A solar heat storage and heat dissipation device provided,
When the solar heat storage device stores solar heat collected in a primary heat medium of the solar heat collection device in a secondary heat medium of the solar heat storage heat dissipation device, the primary heat medium of the solar heat collection device is saturated from superheated steam. Heat exchange between the primary heat medium and the secondary heat medium so that heat is stored in the secondary heat medium in a plurality of different temperature ranges according to the state of water / steam in the process of reaching water lower in temperature. A solar heat storage / heat dissipating device comprising a plurality of heat exchangers.   10. The heat exchanger according to claim 9, wherein the heat exchanger heats the secondary heat medium by sensible heat of the primary heat medium, and heats the secondary heat medium by condensation latent heat of the primary heat medium. A solar heat storage / heat dissipating device comprising a heat exchanger.   The heat exchanger that heats the secondary heat medium by sensible heat of the primary heat medium according to claim 10, has a heating pipe, and flows the primary heat medium into the heating pipe, and the outside of the heating pipe A heat exchanger that performs heat exchange by flowing a secondary heat medium and heats the secondary heat medium by condensation latent heat of the primary heat medium has a cooling pipe, and the secondary heat medium is placed in the cooling pipe. The solar heat storage / heat dissipating apparatus is characterized in that heat exchange is performed by flowing the primary heat medium outside the cooling pipe.   The heat exchanger according to claim 9, comprising a steam heat exchanger, a saturated steam condenser, and a saturated water heat exchanger as the heat exchanger. In the steam heat exchanger, the sensible heat of steam is changed from superheated steam to saturated steam. The thermal energy is recovered, the thermal energy of the latent heat of condensation is recovered in the process of the saturated steam from the saturated steam in the saturated steam condenser, and the saturated water is converted from the saturated water to water having a temperature lower than the saturation temperature in the saturated water heat exchanger. Recovering sensible heat energy of water in the process, equipped with a high-temperature heat storage heat release tank, a medium temperature heat storage heat release tank, a low temperature heat storage heat release tank, the steam heat exchanger, the saturated steam condenser, and the saturated water heat exchanger The solar heat storage and heat dissipation device, wherein the secondary heat medium that has been heat-exchanged and stored is housed in the high-temperature heat-storage and heat-release tank, the medium-temperature heat-storage and heat-release tank, and the low-temperature heat-storage and heat-release tank, respectively. In claim 12,
A saturated water evaporator, heating the temperature of the feed water from the steam turbine power generation facility to near saturated water temperature in the saturated water heat exchanger, changing the phase from saturated water to saturated steam in the saturated water evaporator, In the steam heat exchanger, the temperature of the saturated steam is superheated to superheated steam,
The steam heat exchanger has a heating pipe and a superheating pipe, and collects the sensible heat energy of the superheated steam by flowing the primary heating medium through the heating pipe and flowing the secondary heating medium outside the heating pipe. , Flowing the primary heat medium in the superheat pipe and flowing the secondary heat medium outside the superheat pipe to superheat the saturated steam,
The saturated steam condenser has a cooling pipe, and flows the secondary heat medium into the cooling pipe and flows the primary heat medium outside the cooling pipe to recover the heat energy of condensation latent heat of the saturated steam,
The saturated water evaporator has an evaporator pipe, the primary heat medium is allowed to flow inside the evaporator pipe, the secondary heat medium is allowed to flow outside the evaporator pipe, and the saturated water is phase-changed to saturated steam,
The saturated water heat exchanger has a heating pipe and a preheating pipe, and collects the sensible heat energy of saturated water by flowing the primary heating medium through the heating pipe and flowing the secondary heating medium outside the heating pipe. And flowing the primary heating medium into the preheating pipe and flowing the secondary heating medium outside the preheating pipe to heat and heat the feed water,
The preheat pipe, the evaporator pipe, and the superheat pipe are supplied with the stored secondary heat medium stored in the low temperature heat storage / radiation tank, the intermediate temperature heat storage / radiation tank, and the high temperature heat storage / radiation tank, respectively. A solar heat storage and heat dissipation device.   13. The saturated steam condenser according to claim 12, wherein the saturated steam is ejected in the form of bubbles into the saturated steam condenser, the minute saturated steam in a bubble state is cooled and returned to saturated water, and the latent heat is secondary heat. A solar heat storage and heat dissipation device characterized by being absorbed by a medium.   15. The saturated steam condenser according to claim 14, further comprising a saturated steam condenser inlet pressure adjusting valve and a saturated steam condenser water level adjusting valve, wherein the saturated steam ejection pressure into the saturated steam condenser is controlled. A solar heat storage / heat dissipating device, which is controlled by the saturated steam jet pressure regulating valve and the water level in the saturated steam condenser is controlled by the saturated steam condenser water level regulating valve.

Images