WO2017073040A1 - 太陽熱発電装置およびその制御方法 - Google Patents

太陽熱発電装置およびその制御方法 Download PDF

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Publication number
WO2017073040A1
WO2017073040A1 PCT/JP2016/004668 JP2016004668W WO2017073040A1 WO 2017073040 A1 WO2017073040 A1 WO 2017073040A1 JP 2016004668 W JP2016004668 W JP 2016004668W WO 2017073040 A1 WO2017073040 A1 WO 2017073040A1
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Prior art keywords
molten salt
steam
temperature
power generation
low
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Ceased
Application number
PCT/JP2016/004668
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English (en)
French (fr)
Japanese (ja)
Inventor
正志 蒲原
ロージェ 加藤
範彦 土井
大介 有馬
雄飛 尾▲崎▼
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Chiyoda Corp
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Chiyoda Corp
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Filing date
Publication date
Application filed by Chiyoda Corp filed Critical Chiyoda Corp
Priority to EP16859278.0A priority Critical patent/EP3369926B1/en
Priority to ES16859278T priority patent/ES2861437T3/es
Priority to CN201680064898.6A priority patent/CN108291532B/zh
Priority to MA43127A priority patent/MA43127B1/fr
Publication of WO2017073040A1 publication Critical patent/WO2017073040A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00—Devices for producing mechanical power from solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G5/00—Controlling superheat temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S90/00—Solar heat systems not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

Definitions

  • the present invention relates to a solar thermal power generation apparatus and a control method thereof. More specifically, the present invention relates to a solar thermal power generation apparatus that uses a molten salt as a solar heat storage medium and a heating medium for generating steam and generates electric power using generated steam, and a control method thereof.
  • Solar thermal power generation using a molten salt as a heat storage medium mainly consists of a system that uses a material other than the molten salt as a heating medium and a system that circulates a molten salt used as a heat storage medium and uses it as a heating medium.
  • the former solar power generation method it is necessary to provide a heat exchanger between the heating medium (other than the molten salt) and the heat storage medium (molten salt). Becomes complicated.
  • Patent Document 1 describes a solar thermal power generation apparatus that uses a nitrate-based molten salt as a heating medium and a heat storage medium and can be continuously operated at a high temperature.
  • the present invention has been made in view of these problems, and is a solar power generation capable of improving durability by suppressing an increase in the exhaust temperature of a low-pressure turbine without increasing the cost and achieving high-efficiency power generation.
  • An object of the present invention is to provide a device control method and a solar thermal power generation device.
  • the method for controlling a solar thermal power generation apparatus includes a steam generator that generates steam by heating water with a molten salt, and further generates a superheated steam by further heating the steam generated by the steam generator with a molten salt.
  • a solar thermal power generation apparatus control method for controlling a solar thermal power generation apparatus having a reheat steam temperature detector for detecting a temperature of the supplied reheat steam, the molten salt supplied to the reheater Step for controlling the amount of molten salt in the reheater for controlling the amount Mr And the reheater molten salt amount control step is such that the temperature of the reheat steam detected by the reheat steam temperature detector is 450 ° C.
  • the solar thermal power generation apparatus generates superheated steam by heating water with a molten salt to generate steam, and further heating the steam generated with the steam generator with molten salt.
  • a superheater a high-pressure turbine driven by superheated steam supplied from the superheater, a reheater that reheats the intermediate exhaust steam from the high-pressure turbine with molten salt to generate reheat steam
  • a low-pressure turbine driven by reheat steam supplied from a reheater, a condenser that condenses exhaust steam from the low-pressure turbine to provide water for the steam generator, and supplies the low-pressure turbine
  • a reheat steam temperature detector for detecting the temperature of the reheat steam to be reheated
  • a reheater molten salt amount control unit for controlling the amount Mr of the molten salt supplied to the reheater
  • the reheater molten salt amount control unit is a low load operation that is a load of a predetermined ratio or less.
  • a control method for a solar thermal power generation apparatus and a solar thermal power generation apparatus capable of improving durability by suppressing an increase in exhaust temperature of a low-pressure turbine without causing an increase in cost, and capable of achieving highly efficient power generation. be able to.
  • FIG. 1 is a schematic configuration diagram showing a configuration of a solar thermal power generation apparatus used in one embodiment of a control method for a solar thermal power generation apparatus according to the present invention.
  • the solar thermal power generation apparatus in the present embodiment is a so-called direct two-tank solar thermal power generation apparatus, and is a solar thermal power generation apparatus that employs a system that uses a common molten salt as a heat storage medium and a heating medium.
  • the configuration of the solar thermal power generation apparatus of the present embodiment will be described in order along the solar thermal power generation process.
  • Heating part Since sunlight has a low energy density, concentrated solar power (CSP) that condenses and converts it into heat (ie, collects heat) is widely adopted. Type solar power generation. Accordingly, it is preferable that the heating unit 10 that heats the molten salt condenses sunlight to heat the molten salt.
  • CSP concentrated solar power
  • the heating unit 10 of the present embodiment is a parabolic trough type, and extends in a bowl shape and has a parabolic cross-section, and connects each parabolic focal point position (the vicinity of the parabolic focal point in each cross section). And a conduit 10b arranged in a linear position).
  • the sunlight reflected by the condensing reflecting mirror 10a is condensed at the position of the conduit 10b and converted into heat to heat the molten salt flowing inside the conduit 10b.
  • the parabola and trough type has a simple structure, so the cost can be reduced, and it can easily achieve excellent light collection because it does not require advanced light collection technology. For these reasons, the parabolic trough type has many achievements in the solar thermal power generation apparatus, and is excellent in terms of reliability.
  • the heating section is not limited to the parabolic trough type, and there is no particular limitation as long as the molten salt can be sufficiently heated by solar heat. Therefore, in addition to the parabolic trough type, for example, other well-known ones such as a linear Fresnel type, a tower type, a dish type, etc. may be used, or these may be used in combination.
  • the heating unit 10 of the present embodiment shown in FIG. 1 is configured by eight condensing reflecting mirrors 10a and a conduit 10b common to each condensing reflecting mirror 10a.
  • the parabolic trough heating unit is not limited to this configuration, and may be, for example, a heating unit including an arbitrary number of condensing reflectors, or a conduit having an arbitrary piping configuration. The heating part provided with may be sufficient.
  • the heating unit 10 heats the molten salt to a temperature higher than 400 ° C., which is the upper limit temperature when using conventional oil as a heating medium.
  • the heating temperature of the molten salt in the heating unit 10 is not particularly limited as long as it is a temperature at which the performance of the molten salt does not deteriorate due to irreversible change of the molten salt due to thermal decomposition or the like. Therefore, it is preferable. However, it is necessary to determine the heating temperature in consideration of the balance between the heat resistance of the apparatus itself such as the conduit 10b, power generation efficiency, and cost.
  • the molten salt is heated to 500 ° C. or higher, preferably 500 ° C. or higher and 600 ° C. or lower, more preferably 540 ° C. or higher and 560 ° C. or lower.
  • the conduit 10b connects the low-temperature heat storage tank 20 and the high-temperature heat storage tank 22 via the condensing position of the heating unit 10, and the molten salt stored in the low-temperature heat storage tank 20 is supplied to the inside of the conduit 10b. It can be made to flow and be led to the high temperature heat storage tank 22.
  • nitrate-based molten salts are excellent in safety, stability and cost, and are widely used as molten salts.
  • a nitrate-based molten salt it is possible to heat to a higher temperature than when a conventional oil is used as a heating medium, and a high-temperature steam is obtained, so that highly efficient solar thermal power generation can be realized.
  • oil as a heating medium
  • decomposition occurs in long-term use and the performance deteriorates. Even if it is used at a high temperature exceeding 400 ° C., the performance does not deteriorate due to decomposition.
  • a mixture of sodium nitrate and potassium nitrate is used as the molten salt.
  • the present invention is not limited to this, and is not particularly limited as long as it can be used as a heat storage medium and a heating medium in a solar thermal power generation apparatus.
  • the nitrate-based molten salt in addition to a two-component mixture of sodium nitrate and potassium nitrate, a three-component system and a four-component system obtained by adding lithium nitrate or the like to this mixture are also known. Can do.
  • the melting point is about 230 ° C., and in an actual operating environment, the temperature is 40 to 50 ° C. higher than the melting point as a measure for preventing solidification of the molten salt.
  • the system is controlled in this way.
  • the molten salt preferably has a low melting point in order to suppress the consumption of heat energy for preventing solidification at night in winter. However, it is necessary to select a molten salt in consideration of its safety, stability, viscosity at operating temperature and cost.
  • the solar thermal power generation apparatus 100 includes a low temperature heat storage tank 20 and a high temperature heat storage tank 22. That is, the solar thermal power generation apparatus 100 in the present embodiment includes a two-tank heat storage unit that stores a low-temperature molten salt and a high-temperature molten salt separately in two tanks and can supply them independently.
  • the heat storage unit in the present invention is not limited to the two-tank type, and may have any configuration as long as the low-temperature molten salt and the high-temperature molten salt can be supplied independently.
  • a heat storage part other than the two-tank type for example, a single tank type heat storage part may be mentioned. In the single tank type heat storage unit, a high-temperature molten salt is stored in the upper part of a single tank, and a low-temperature molten salt is stored in the lower part, so that each can be supplied independently.
  • the molten salt is stored in the low-temperature heat storage tank 20 at a low temperature. And the molten salt stored in this low-temperature heat storage tank 20 receives solar thermal energy from the condensing reflection mirror 10a by the conduit
  • the low temperature heat storage tank 20 and the high temperature heat storage tank 22 are not particularly limited as long as the molten salt can be stored.
  • the low-temperature heat storage tank 20 and the high-temperature heat storage tank 22 in the present embodiment can store a molten salt that transitions from a low-temperature state of about 270 ° C. to a high-temperature state of 500 ° C. or higher, and has a heat-insulating property, heat resistance, and durability. belongs to.
  • the superheater 32 generates superheated steam by heat exchange between the heating medium (molten salt) and steam, and supplies this superheated steam to a high-pressure turbine 36 described later.
  • a high-temperature molten salt is supplied from the high-temperature heat storage tank 22 to the superheater 32.
  • a high-temperature molten salt is supplied from the high-temperature heat storage tank 22 to the superheater 32.
  • the superheater 32 is supplied with steam (steam) generated by the steam generator 30. And this steam is heated by heat exchange with high temperature molten salt, and superheated steam is generated.
  • the molten salt that has released heat by heat exchange is sent to the steam generator 30.
  • the steam generator 30 generates water by heating water supplied from a condenser 40, which will be described in detail later, and supplies this steam to the superheater 32.
  • the water supplied from the condenser 40 is heated to become steam by heat exchange between the molten salt discharged from the superheater 32 and the molten salt discharged from the reheater 34 described later in the steam generator 30, It is supplied to the superheater 32.
  • the molten salt that has released heat by heat exchange and has reached a low temperature state is sent to the low temperature heat storage tank 20.
  • the high pressure turbine 36 is driven by superheated steam supplied from the superheater 32. That is, the turbine blades included in the high-pressure turbine 36 are rotated by the work of the superheated steam, and electric power is generated by the generator G.
  • the superheated steam after the work is discharged to a reheater 34 described later as intermediate discharge steam.
  • a part of the steam is extracted from the inside and discharged to a preheater (not shown). Power generation efficiency can be increased by using the heat of the extracted steam in the preheater.
  • the reheater 34 generates reheat steam by heat exchange between the heating medium (molten salt) and the intermediate exhaust steam, and supplies the reheat steam to a low-pressure turbine 38 described later.
  • a high temperature molten salt is supplied to the reheater 34 from the high temperature heat storage tank 22.
  • high-temperature molten salt is supplied from the high-temperature heat storage tank 22 to the reheater 34.
  • the intermediate exhaust steam exhausted from the high pressure turbine 36 is supplied to the reheater 34.
  • the intermediate exhaust steam is heated by heat exchange with the high-temperature molten salt, and reheat steam is generated.
  • the molten salt that has released heat by heat exchange is sent to the steam generator 30.
  • the molten salt supplied from the high-temperature heat storage tank 22 branches and is supplied to each of the superheater 32 and the reheater 34.
  • the low-pressure turbine 38 is driven by reheat steam supplied from the reheater 34. That is, the turbine blades included in the low-pressure turbine 38 are rotated by the work of the reheated steam, and electric power is generated by the generator G.
  • the reheated steam after the work is discharged to a condenser 40, which will be described later, as discharged steam.
  • a part of the steam is extracted from the inside in a multistage manner (four stages), and is discharged to, for example, a heat exchanger (not shown). Power generation efficiency can be increased by using the heat of the extracted steam in a heat exchanger or the like.
  • the condenser 40 is provided to cool and condense the exhaust steam discharged from the low-pressure turbine 38 and return it to water to lower the back pressure and increase the output. This water is supplied to the steam generator 30 and again used for power generation.
  • the above-mentioned water and various steams circulate in the solar thermal power generation system by circulation means (not shown) such as a pump appropriately disposed in the water / steam circulation path.
  • the molten salt circulates in the solar thermal power generation system by circulation means (not shown) such as a pump appropriately disposed in the molten salt circulation path.
  • a reheat steam temperature detector (not shown) detects the temperature of the reheat steam discharged from the reheater 34 and supplied to the low-pressure turbine 38. Therefore, the reheat steam temperature detector is provided in the path between the reheater 34 outlet and the low pressure turbine 38 inlet.
  • the reheat steam temperature detector may be installed at any position in the path between the reheater 34 outlet and the low pressure turbine 38 inlet as long as the reheat steam temperature can be accurately detected. Also good.
  • a plurality of reheat steam temperature detectors are provided in the vicinity of the inlet of the low pressure turbine 38, and the temperature of the reheat steam is detected in each.
  • the reheat steam temperature detector is not particularly limited as long as it can detect the temperature of the reheat steam, and any temperature detection method may be adopted.
  • a reheat steam temperature detector detects the temperature of reheat steam
  • temperature detection is carried out so that it can always detect that the solar thermal power generation apparatus 100 has brought about some abnormality. Is always (continuous).
  • the present invention is not limited to this, and for example, the temperature of the reheat steam may be detected only during low load operation.
  • the temperature of the reheat steam detected by the reheat steam temperature detector is sent to a reheater molten salt amount control unit described later.
  • a solar thermal power generation apparatus normally generates power by performing normal operation at a load of 100% with respect to a rated load.
  • solar power generation devices can be Reduce the load and perform low-load operation. If the amount of high-temperature molten salt supplied is insufficient, such as rainy or cloudy days or nighttime when the amount of sunlight irradiated is less than the required amount, all stored high-temperature molten salt will be kept at a low temperature if normal operation is continued. Eventually, it will solidify in the solar power generator.
  • the consumption of high-temperature molten salt may be suppressed by performing low-load operation until the amount of sunlight irradiation increases. Also, when the amount of power demand is low and power cannot be sent to the outside, such as early morning or late at night when not much power is consumed, normal operation cannot be performed as it is, so low-load operation is required until the amount of power demand increases. May be performed. Generally, in a solar thermal power generator, power generation is performed by switching between normal operation and low load operation.
  • the solar thermal power generation apparatus 100 has the highest power generation efficiency when the rated load (that is, 100% load) is achieved, and can perform power generation satisfactorily without increasing the temperature of the exhaust steam from the low-pressure turbine 38.
  • the solar thermal power generation apparatus 100 that circulates a molten salt that becomes a very high temperature as a heating medium, the temperature of exhaust steam from the low-pressure turbine 38 increases during low-load operation, leading to problems such as damage to turbine blades. . Therefore, in the present embodiment, a reheater molten salt amount control step (reheater described later) is performed so that the temperature of exhaust steam from the low-pressure turbine 38 does not excessively increase during low load operation that is a load of a predetermined ratio or less. The amount of molten salt Mr supplied to the reheater 34 is controlled by the molten salt amount control unit).
  • the low load operation in the present embodiment refers to an operation state in which the load is 25% or less of the rated load of the solar thermal power generation apparatus 100.
  • the allowable minimum load is a load that is minimum required for operating the solar thermal power generation apparatus.
  • the low load operation is performed with a load of preferably 5% to 25%, more preferably 5% to 20%, and particularly preferably 7% to 15%.
  • the present invention is not limited to these. Since the rated load and the allowable minimum load of the solar thermal power generation device are values specific to the device, it is most preferable to perform a low load operation with a predetermined proportion of load corresponding to the device.
  • the reheater molten salt amount control unit acquires the temperature of the reheat steam output from the reheat steam temperature detector during low load operation, and controls the amount Mr of the molten salt supplied to the reheater 34.
  • the temperature of the reheat steam is set to 450 ° C. or lower.
  • the reheater molten salt amount control unit in the present embodiment controls the reheater 34 so that the temperature of the reheat steam becomes 450 ° C. or less.
  • the amount Mr of the molten salt supplied is reduced.
  • the temperature of the reheat steam is preferably 450 ° C. or lower, and more preferably 370 ° C. or higher and 430 ° C. or lower.
  • the temperature of the reheat steam supplied to the low-pressure turbine 38 during the low-load operation is 450 ° C. or lower, so that the inside of the low-pressure turbine 38 does not become too high, and damage to the turbine blades of the low-pressure turbine 38 is prevented. Can do.
  • the temperature of the molten salt itself supplied to the superheater 32 and the reheater 34 is not lowered, the temperature of the superheated steam is kept at 500 ° C. or higher, so that a decrease in power generation efficiency is suppressed. Highly efficient power generation is performed.
  • the temperature of the reheat steam is set to 450 ° C. or less and high power generation is performed. In order to obtain efficiency, it is particularly preferable to keep the temperature of the reheat steam high. More specifically, considering the model of the solar thermal power generation apparatus 100, the model of the low-pressure turbine 38, the operation load factor, etc., it is possible to obtain high power generation efficiency while avoiding the risk of damage to the turbine blades of the low-pressure turbine 38. It is particularly preferable to control the amount Mr of the molten salt so that the temperature of the reheated steam becomes high.
  • the reheater molten salt amount control unit obtains other temperatures in addition to the reheat steam temperature output from the reheat steam temperature detector, and supplies the reheater 34 with the amount Mr of molten salt. May be controlled.
  • the temperature output from the temperature detector that can detect the temperature of the steam discharged from the outlet of the low-pressure turbine 38 is acquired and used as a control factor together with the temperature of the reheat steam output from the reheat steam temperature detector.
  • the amount Mr of the molten salt supplied to the reheater 34 may be controlled.
  • the amount of steam used in the solar thermal power generation apparatus 100 is determined from the amount of power generation.
  • the amount of steam is determined, the amount of high-temperature molten salt required, that is, the superheater 32 and the reheater 34 is determined.
  • the total amount Mt of molten salt to be supplied is determined. Further, as described above, during the low load operation, the amount of molten salt Mr supplied to the reheater 34 is determined by the reheater molten salt amount control unit.
  • the difference (Mt ⁇ Mr) obtained by subtracting the amount Mr of the molten salt supplied to the reheater 34 from the total amount Mt of molten salt supplied to the superheater 32 and the reheater 34 is the molten salt supplied to the superheater 32. Therefore, the molten salt supply (circulation) control of the entire solar thermal power generation apparatus 100 during low-load operation is determined.
  • the amount of molten salt Mr to be supplied to the reheater 34 is theoretically determined, and thus is naturally determined without being controlled by the reheater molten salt amount control unit.
  • the solar thermal power generation apparatus may include a configuration commonly used in the solar thermal power generation apparatus in addition to the above-described configurations.
  • Example 1 Comparative Examples 1 and 2, Reference Example 1
  • Example 1 Comparative Examples 1 and 2, and Reference Example 1
  • simulation of solar thermal power generation in the solar thermal power generation apparatus shown in FIG. 1 was performed.
  • Comparative Example 1 is a low load operation state with a 10% load with respect to the rated load of the solar thermal power generation apparatus 100.
  • control was performed to reduce the temperature of the high-pressure turbine inlet (temperature of the superheated steam) and the temperature of the low-pressure turbine inlet (temperature of the reheated steam) by lowering the temperature of the molten salt itself.
  • the temperature of the steam at the outlet of the low-pressure turbine 38 was 53.83 ° C.
  • the power generation efficiency of Comparative Example 2 and Example 1 described later was evaluated using the power generation efficiency in Comparative Example 1 as a reference value.
  • the comparative example 2 it is the state of low load operation of 10% load with respect to the rated load of the solar thermal power generation apparatus 100.
  • the amount Mr of molten salt supplied to the reheater 34 was controlled using the target steam flow rate as an index, as in the prior art, without lowering the temperature of the molten salt as in Comparative Example 1.
  • the power generation efficiency increased by about 2.95% compared to Comparative Example 1, but the steam temperature at the outlet of the low-pressure turbine 38 was 126.80 ° C., which was not a temperature that could withstand practical use.
  • Example 1 the control was performed according to the above-described reheater molten salt amount control step of controlling the amount Mr of the molten salt supplied to the reheater 34 using the temperature of the reheat steam as an index. That is, the amount Mr of the molten salt supplied to the reheater 34 was controlled so that the temperature of the reheat steam at the inlet of the low-pressure turbine 38 was 400 ° C. In Example 1, the temperature of the steam at the outlet of the low-pressure turbine 38 was 53.83 ° C. In the first embodiment, the temperature of the steam at the outlet of the low-pressure turbine 38 is low, so there is no risk of damage to the turbine blades even during long-term use. In Example 1, the power generation efficiency increased by about 0.91% compared to Comparative Example 1, and high power generation efficiency was achieved.
  • Reference Example 1 is an operation state (100% load) at the rated load of the solar thermal power generation apparatus 100, that is, a normal operation state.
  • the steam temperature at the outlet of the low-pressure turbine 38 was 41.07 ° C.
  • the steam temperature at the outlet of the low-pressure turbine 38 was low, so that there is no possibility of damage to the turbine blades even during long-term use.
  • the amount of molten salt supplied to the reheater is controlled using the temperature of the reheat steam as an index during low load operation.
  • the solar thermal power generation apparatus control method and the solar thermal power generation apparatus it is understood that a rise in exhaust temperature can be suppressed and durability can be improved and a highly efficient power generation can be achieved without causing an increase in cost. It was.

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PCT/JP2016/004668 2015-10-28 2016-10-24 太陽熱発電装置およびその制御方法 Ceased WO2017073040A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16859278.0A EP3369926B1 (en) 2015-10-28 2016-10-24 Solar thermal power generation system and method for controlling same
ES16859278T ES2861437T3 (es) 2015-10-28 2016-10-24 Sistema para la generación de energía térmica solar y método de control del mismo
CN201680064898.6A CN108291532B (zh) 2015-10-28 2016-10-24 太阳能发电装置及其控制方法
MA43127A MA43127B1 (fr) 2015-10-28 2016-10-24 Système de production d'énergie solaire thermique et son procédé de régulation

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JP2015211799A JP6596303B2 (ja) 2015-10-28 2015-10-28 太陽熱発電装置およびその制御方法
JP2015-211799 2015-10-28

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EP (1) EP3369926B1 (enExample)
JP (1) JP6596303B2 (enExample)
CN (1) CN108291532B (enExample)
CL (1) CL2018001011A1 (enExample)
ES (1) ES2861437T3 (enExample)
MA (1) MA43127B1 (enExample)
PT (1) PT3369926T (enExample)
SA (1) SA518391449B1 (enExample)
WO (1) WO2017073040A1 (enExample)

Cited By (13)

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CN107191343A (zh) * 2017-07-28 2017-09-22 中国电力工程顾问集团西北电力设计院有限公司 一种全负荷熔盐蒸汽发生系统及其控制方法
CN110886629A (zh) * 2018-09-07 2020-03-17 上海明华电力技术工程有限公司 一种利用光热实现热电解耦的系统和方法
CN109083811A (zh) * 2018-09-25 2018-12-25 兰州大成聚光能源科技有限公司 风力光热发电设备和方法
CN109026224A (zh) * 2018-10-17 2018-12-18 中国船舶重工集团公司第七0三研究所 一种单罐蓄热式储能热电联供系统
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CN112781271A (zh) * 2021-02-03 2021-05-11 国电龙源电力技术工程有限责任公司 蓄热型太阳能联合供冷供热系统
CN114251642A (zh) * 2021-11-30 2022-03-29 碳中和绿色建筑科技(苏州)有限公司 熔盐储热换热系统
CN114294066A (zh) * 2022-01-19 2022-04-08 孙道军 一种超音频电磁感应加热二元盐储能发电系统及方法
CN114857974A (zh) * 2022-05-17 2022-08-05 上海电气集团股份有限公司 熔盐储热供汽系统及供汽方法
CN114857974B (zh) * 2022-05-17 2025-01-10 上海电气集团股份有限公司 熔盐储热供汽系统及供汽方法
CN115574305A (zh) * 2022-09-29 2023-01-06 西安热工研究院有限公司 一种熔盐堆发电、储能与供热耦合运行系统及方法
CN119593824A (zh) * 2024-12-09 2025-03-11 华能平凉发电有限责任公司 一种配置蒸汽引射器和储热装置的深度调峰系统及运行方法

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