[go: up one dir, main page]

WO2016189702A1 - Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique - Google Patents

Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique Download PDF

Info

Publication number
WO2016189702A1
WO2016189702A1 PCT/JP2015/065271 JP2015065271W WO2016189702A1 WO 2016189702 A1 WO2016189702 A1 WO 2016189702A1 JP 2015065271 W JP2015065271 W JP 2015065271W WO 2016189702 A1 WO2016189702 A1 WO 2016189702A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat collecting
collecting tube
heat
light shielding
shielding member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/065271
Other languages
English (en)
Japanese (ja)
Inventor
実 湯浅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chiyoda Corp
Original Assignee
Chiyoda Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chiyoda Corp filed Critical Chiyoda Corp
Priority to PCT/JP2015/065271 priority Critical patent/WO2016189702A1/fr
Publication of WO2016189702A1 publication Critical patent/WO2016189702A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • 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
    • Y02E10/44—Heat exchange systems

Definitions

  • the present invention relates to a solar heat collecting apparatus that heats a heat medium flowing in a heat collecting tube by collecting sunlight.
  • Solar heat that generates electricity by concentrating sunlight on the heat collection tube using a reflector, heating the heat medium flowing in the heat collection tube, generating steam using the heated heat medium, and turning the steam turbine Power generation systems are known.
  • the solar thermal power generation system has a lower introduction cost than the solar power generation system and can generate power for 24 hours by heat storage.
  • a solar thermal power generation system using oil as a heat medium has been proposed (see, for example, Patent Document 1).
  • molten salt has attracted attention as a heat medium used in solar thermal power generation systems. Since the molten salt has a high boiling point, the operating temperature can be made relatively high according to the molten salt, and power generation efficiency is improved by generating high-temperature steam.
  • the molten salt solidifies at about 250 ° C, when the molten salt is poured into the heat collection tube after startup and maintenance, if the temperature of the heat collection tube is relatively low, the heat collection tube is deprived of heat and the molten salt is solidified. Yes. Therefore, it is necessary to preheat the heat collecting tube to a predetermined temperature or higher before pouring the molten salt into the heat collecting tube.
  • the heat collecting tube As one method for preheating the heat collecting tube, it is conceivable to pass an electric current through the heat collecting tube. When current is passed, the heat collecting tube can be warmed by Joule heat at that time.
  • the preheating method in which a current flows through the heat collecting tube as described above has a problem that a very large amount of electric power is required and the cost is increased.
  • the present invention has been made in view of such a situation, and an object thereof is to provide a technique capable of preheating a heat collecting tube at a low cost in a solar heat collecting apparatus.
  • a solar heat collecting apparatus includes a heat collecting tube for flowing a heat medium, a reflector for collecting sunlight on the heat collecting tube, and a heat medium introduced into the heat collecting tube. And a light shielding member attached to a part of the reflector and / or the heat collecting tube.
  • the light shielding member may be provided with a fixing portion for detachably fixing to the reflecting plate.
  • the light shielding member may be a cloth-like member provided so as to cover a part of the reflecting plate.
  • the light shielding member may be a metal member provided so as to cover a part of the heat collecting tube.
  • the metal member may be a cylindrical body provided with a plurality of openings.
  • Another aspect of the present invention is a method for preheating a heat collecting tube in a solar heat collecting apparatus including a heat collecting tube through which a heat medium flows and a reflector for collecting sunlight on the heat collecting tube.
  • the preheating method includes a step of attaching a light shielding member to a part of the reflector and / or the heat collecting tube, and a step of concentrating sunlight on the heat collecting tube using the reflector.
  • Still another aspect of the present invention provides a heat medium introducing method for introducing a heat medium into a heat collecting tube in a solar heat collecting apparatus including a heat collecting tube through which a heat medium flows and a reflector for collecting sunlight on the heat collecting tube. It is.
  • the heat medium introduction method includes a step of attaching a light shielding member to a part of the reflector and / or the heat collector, a step of concentrating sunlight on the heat collector using the reflector, and preheating the heat collector.
  • the heat collecting tube can be preheated at low cost in the solar heat collecting apparatus.
  • FIG. 5A and FIG. 5B are views for explaining how the light shielding member is attached according to the embodiment of the present invention.
  • FIG. 6A and FIG. 6B are views for explaining an attachment mode of a light shielding member according to another embodiment of the present invention.
  • FIG. 1 is a diagram for explaining a solar thermal power generation system 100 according to an embodiment of the present invention.
  • the solar thermal power generation system 100 includes three areas: a light collection area 121, a heat storage area 122, and a power generation area 123.
  • the condensing area 121 mainly includes the solar heat collecting device 8.
  • the solar heat collecting device 8 includes a heat medium flow path 11 composed of a plurality of heat collecting tubes through which a heat medium flows, and a plurality of reflectors 13 that collect sunlight on the heat collecting tubes and heat the heat medium.
  • the heated heat medium is sent to the heat storage area 122.
  • the heat storage area 122 includes a hot tank 102 and a cold tank 103.
  • power can be generated when necessary. For example, it is possible to generate power during bad weather at night or during the day.
  • the power generation area 123 includes a steam generator 104, a steam turbine generator 106, and a condenser 108.
  • the steam generator 104 generates steam by heat exchange between the cooling water and the heated heat medium, and the steam turbine generator 106 rotates the turbine by the steam. Power is generated by this rotation.
  • the condenser 108 returns the steam to the cooling water.
  • FIG. 2 is a diagram for explaining the solar heat collecting apparatus 8 according to the embodiment of the present invention.
  • the solar heat collecting device 8 includes a plurality (four in FIG. 1) of light collecting units 10 and a connection channel 50.
  • Each condensing unit 10 includes a heat medium flow path 11 and a plurality of reflecting plates 13.
  • Each heat medium flow path 11 is formed in a U-shape, and includes a long straight line portion 11a and 11b that are parallel to each other and a short straight line portion 11c that connects one ends of the long straight line portions 11a and 11b.
  • Each of the long straight portions 11a and 11b includes a plurality of heat collecting tubes 12 arranged in a straight line.
  • the short straight part 11 c is composed of a connecting pipe 14.
  • the length A of the long straight portions 11a and 11b may be about 100 to 200 m.
  • the length of each heat collecting tube 12 may be about 10 to 20 m.
  • the long straight portion 11a may be composed of 10 to 20 heat collecting tubes 12.
  • the length B of the short straight line portion 11c may be 20 to 30 m.
  • molten salt as a heat medium that receives solar heat flows.
  • Molten salt is warmed to a higher temperature because it has a higher boiling point than the synthetic oil conventionally used in solar collectors. Thereby, the power generation efficiency of the solar thermal power generation system 100 is improved.
  • the molten salt solidifies at about 250 ° C.
  • the molten salt is basically solidified because it is heated by solar heat during operation, for example, when the molten salt is poured into the heat collecting tube 12 at start-up or after maintenance, the temperature of the heat collecting tube 12 is relatively low. In this case, the heat collecting tube 12 can be deprived of heat and solidified. Therefore, in the present embodiment, before the molten salt is poured into the heat collecting tube 12, the heat collecting tube 12 is preheated to a predetermined temperature or higher. A method for introducing the molten salt into the heat collecting tube 12 will be described later.
  • connection channel 50 is an annular channel and is connected to each heat medium channel 11.
  • the connection channel 50 is also connected to the hot tank 102 and the cold tank 103 in the heat storage area 122. Therefore, each heat medium flow path 11 is connected to the hot tank 102 and the cold tank 103 via the connection flow path 50.
  • a heat medium flows from the cold tank 103 into the connection channel 50.
  • the heat medium flowing through the connection flow path 50 is poured into the long straight portion 11 a of each heat medium flow path 11.
  • the heat medium heated through the heat collecting pipe 12 of the long straight portion 11a flows through the connecting pipe 14 to the long straight portion 11b.
  • the heat medium heated through the heat collecting pipe 12 of the long straight portion 11 b returns to the connection flow path 50 and flows into the hot tank 102.
  • FIG. 3 is a schematic perspective view for explaining the solar heat collecting device 8.
  • the solar heat collecting device 8 includes a gantry 30 on the ground, and a heat collecting tube 12 and a reflecting plate 13 that are rotatably supported by the gantry 30.
  • the solar heat collecting device 8 includes a rotating device that rotates the heat collecting tube 12 and the reflecting plate 13 following the sun.
  • the reflection plate 13 is made of a highly reflective mirror or metal plate (for example, a steel plate or an aluminum plate).
  • the reflection surface 13a of the reflection plate 13 is formed in a parabolic column shape.
  • the heat collecting tube 12 is a tube extending linearly.
  • the heat collecting tube 12 is covered with a vacuum glass tube for heat insulation.
  • the heat collecting tube 12 is supported so that the center thereof is located at the focal point of the parabolic columnar reflecting surface 13 a of the reflecting plate 13.
  • the sunlight reflected by the reflecting surface 13a is condensed at the focal point of the parabolic column surface, so that the heat collecting tube 12 located at the focal point can be efficiently heated.
  • FIG. 4 is a flowchart for explaining a heat medium introduction method according to the embodiment of the present invention.
  • FIG. 5A and FIG. 5B are views for explaining how the light shielding member is attached according to the embodiment of the present invention.
  • FIG. 5A is a schematic front view of the solar heat collecting device 8
  • FIG. 5B is a schematic side view of the solar heat collecting device 8.
  • the light shielding member 40 is a cloth-like member. Although the kind of this cloth-like member is not particularly limited, synthetic fibers such as nylon and polyester are suitable because shrinkage hardly occurs. In the present embodiment, as shown in FIGS. 5A and 5B, the light shielding member 40 is attached so as to cover the upper portion 13 u and the lower portion 13 d of the reflective surface 13 a of the light shielding member 40. Yes.
  • a fixing portion 41 for detachably fixing the light shielding member 40 to the reflecting plate 13 is provided at the end of the light shielding member 40.
  • the light shielding member 40 may be a hook-and-loop fastener or a magnet, for example.
  • the fixing portion 41 may be a string for binding the light shielding member 40 to the reflecting plate 13.
  • the light shielding member 40 may be attached to the reflecting plate 13 by forming the fixing portion 41 in a bag shape and covering the reflecting plate 13 with the bag-shaped fixing portion 41.
  • the explanation of the method of introducing the heat medium will be continued.
  • the collection of sunlight on the heat collecting tube 12 is started (S12).
  • the rotating device described above is operated to cause the heat collecting tube 12 and the reflecting plate 13 to follow the sun.
  • the reflected light from the portion of the reflecting surface 13a of the reflecting plate 13 that is not covered with the light shielding member 40 is condensed on the heat collecting tube 12, and the heat collecting tube 12 is preheated.
  • a heat medium is introduced into the heat collecting tube 12 (S14). Since the heat collecting tube 12 is preheated, the heat medium can be poured into the heat collecting tube 12 without solidifying.
  • the collection of sunlight on the heat collection tube 12 is stopped (S16). That is, the rotating device is operated so that the reflecting surface 13a of the reflecting plate 13 does not face the sun. Finally, the light shielding member 40 is removed from the reflecting plate 13 (S18), and the introduction of the heat medium is completed.
  • the heat collecting tube 12 When sunlight is collected on the heat collecting tube 12 without attaching the light shielding member 40 to the reflecting plate 13 in a state where no heat medium is introduced into the heat collecting tube 12, the heat collecting tube 12 becomes a so-called empty state. It may become hot and break. As in this embodiment, by attaching the light shielding member 40 so as to cover a part of the reflection surface 13a of the reflection plate 13, the amount of light collected on the heat collection tube 12 can be suppressed. It becomes possible to prevent the heat collecting tube 12 from being very high and to prevent the heat collecting tube 12 from being damaged.
  • the heat medium introducing method according to the present embodiment is simply prepared by preparing a cloth-shaped light shielding member 40, attaching it to the reflecting plate 13 before introducing the heat medium, and removing it from the reflecting plate 13 after introducing the heat medium. Compared with the method of preheating by supplying an electric current to the heat tube, it is very simple and low cost.
  • the light shielding member 40 is attached so as to be along the reflection surface 13a of the reflection plate 13, but is not necessarily limited to such an attachment form, and from the reflection surface 13a. It is sufficient that the light shielding member 40 is provided so that the reflected light does not reach the heat collecting tube 12. For example, the light shielding member 40 may be attached so as to hang vertically downward from the upper end of the reflecting plate 13.
  • the light shielding member 40 is a cloth-like member, but when the reflecting plate 13 is a magnetic body, the light shielding member 40 may be a rubber magnet. In this case, the entire light shielding member 40 functions as a fixing portion for detachably fixing to the reflection plate 13.
  • FIG. 6 (a) and 6 (b) are views for explaining an attachment mode of a light shielding member according to another embodiment of the present invention.
  • FIG. 6A is a schematic front view of the heat collecting tube 12
  • FIG. 6B is a schematic side view of the heat collecting tube 12.
  • the heat collecting tube 12 is covered with a vacuum glass tube 60 for heat insulation.
  • a light shielding member 62 is attached so as to cover the heat collecting tube 12 and the vacuum glass tube 60.
  • the light shielding member 62 is a metallic cylindrical member, and is composed of two semi-cylindrical divided cylindrical members 63.
  • the two divided cylindrical members 63 are fixed on the outer peripheral surface of the vacuum glass tube 60 by bolts 64 and nuts 65.
  • the bolt 64 and the nut 65 function as a fixing portion for detachably fixing the light shielding member 62 to the heat collecting tube 12 and the vacuum glass tube 60.
  • the light shielding member 62 is made of a so-called punching metal provided with a plurality of openings 66.
  • the metal light shielding member 40 is prepared and attached so as to cover the heat collecting tube 12 and the vacuum glass tube 60 before introducing the heat medium, and the heat medium is introduced. Since it is simply removed from the heat collecting tube 12 and the vacuum glass tube 60 later, it is much simpler and less expensive than the above-described method of applying current to the heat collecting tube and preheating.
  • the preheating temperature of the heat collecting tube 12 is affected by the aperture ratio of the light shielding member.
  • the aperture ratio of the light shielding member is the area ratio of the reflection surface covered with the light shielding member 40 to the total reflection surface of the reflection plate 13 in the embodiment shown in FIGS. 5 (a) and 5 (b).
  • the aperture ratio 100% of the light shielding member 40 is a state where the reflection surface 13a is not covered with the light shielding member 40 at all, and the aperture ratio 0% of the light shielding member 40 is that the reflection surface 13a is entirely covered with the light shielding member 40. It is in the state.
  • the aperture ratio of the light shielding member is the area ratio of the surface of the heat collecting tube 12 covered with the light shielding member 62 to the entire surface of the heat collecting tube 12. is there.
  • the opening ratio 100% of the light shielding member 62 is a state where the surface of the heat collecting tube 12 is not covered with the light shielding member 62 at all, and the opening ratio of the light shielding member 62 is 0% of the surface of the heat collecting tube 12. 62 is covered.
  • T is the preheating temperature
  • e (T) is the heat collecting tube heat radiation per unit length at the preheating temperature
  • P DNI is the direct normal surface solar radiation intensity
  • A is the width of the reflector 13
  • ⁇ is the light collection efficiency.
  • the width of the reflecting plate 13 means the opening width in the short direction of the reflecting plate 13.
  • the preferable range of the aperture ratio r is 8% to 12%.
  • the light shielding member is provided on one of the reflecting plate and the heat collecting tube, but the light shielding member may be provided on both the reflecting plate and the heat collecting tube.
  • the present invention can be used for a solar heat collecting device used in a solar thermal power generation system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Dispositif de collecte de chaleur solaire (8) pourvu d'un tube de collecte de chaleur (12) dans lequel s'écoule un milieu thermique, d'une plaque de réflexion (13) qui condense la lumière solaire sur le tube de collecte de chaleur (12), et d'un élément de blocage de lumière (40) qui est fixé de manière à couvrir une partie de la surface de réflexion (13a) de la plaque de réflexion (13) lorsque le milieu thermique est introduit dans le tube de collecte de chaleur (12).
PCT/JP2015/065271 2015-05-27 2015-05-27 Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique Ceased WO2016189702A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/065271 WO2016189702A1 (fr) 2015-05-27 2015-05-27 Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/065271 WO2016189702A1 (fr) 2015-05-27 2015-05-27 Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique

Publications (1)

Publication Number Publication Date
WO2016189702A1 true WO2016189702A1 (fr) 2016-12-01

Family

ID=57392999

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/065271 Ceased WO2016189702A1 (fr) 2015-05-27 2015-05-27 Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique

Country Status (1)

Country Link
WO (1) WO2016189702A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113587454A (zh) * 2021-08-18 2021-11-02 河海大学 一种磁场调控太阳能集热装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55166360U (fr) * 1979-05-17 1980-11-29
JPS58213152A (ja) * 1982-06-03 1983-12-12 Matsushita Electric Ind Co Ltd 太陽熱集熱装置
WO2010032095A2 (fr) * 2008-09-18 2010-03-25 Kloben S.A.S. Di Turco Adelino Ec. Dispositif capteur solaire sans poursuite
US20100236600A1 (en) * 2007-06-08 2010-09-23 Sopogy, Inc. Parking solar energy collectors
WO2013019670A2 (fr) * 2011-07-29 2013-02-07 Babcock & Wilcox Power Generation Group, Inc. Capteur solaire à sel fondu et à circulation par serpentin vertical assemblé en usine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55166360U (fr) * 1979-05-17 1980-11-29
JPS58213152A (ja) * 1982-06-03 1983-12-12 Matsushita Electric Ind Co Ltd 太陽熱集熱装置
US20100236600A1 (en) * 2007-06-08 2010-09-23 Sopogy, Inc. Parking solar energy collectors
WO2010032095A2 (fr) * 2008-09-18 2010-03-25 Kloben S.A.S. Di Turco Adelino Ec. Dispositif capteur solaire sans poursuite
WO2013019670A2 (fr) * 2011-07-29 2013-02-07 Babcock & Wilcox Power Generation Group, Inc. Capteur solaire à sel fondu et à circulation par serpentin vertical assemblé en usine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113587454A (zh) * 2021-08-18 2021-11-02 河海大学 一种磁场调控太阳能集热装置

Similar Documents

Publication Publication Date Title
JP5868809B2 (ja) 発電プラントおよび熱供給方法
US20130133324A1 (en) Hybrid solar power plant
EP2472111A1 (fr) Système de condensation de la lumière solaire
US20150000277A1 (en) Solar power plants and energy storage systems for solar power plants
JP2009150360A (ja) ビームダウン方式太陽熱発電装置
JP2002522908A (ja) 光起電力装置
WO2016189702A1 (fr) Dispositif de collecte de chaleur solaire, procédé de préchauffage de tube de collecte de chaleur, et procédé d'introduction de milieu thermique
CN102878699A (zh) 混合型太阳能集中装置
JP6543711B2 (ja) 太陽熱収集装置
KR101797393B1 (ko) 복합가열로 시스템
JP6543710B2 (ja) 加熱装置
CN107709892B (zh) 加热系统
WO2017002262A1 (fr) Dispositif de chauffage
WO2016189703A1 (fr) Dispositif de collecte de chaleur solaire et procédé de chauffage de tube de collecte de chaleur
CN107709891B (zh) 太阳能热收集装置的接地构造、太阳能热收集装置和太阳能热发电系统
KR100666056B1 (ko) 태양열을 이용한 발전시스템
CN107923657A (zh) 太阳热收集装置
JP3039163U (ja) 太陽光、熱エネルギーの有効利用機器システム
CN108375206B (zh) 一种槽式太阳能连接系统及其方法
Lorenz et al. New developments for future solar power plants
CN115164418A (zh) 宽开口槽式太阳能聚光器
JP2003041907A (ja) 集光レンズを用いて太陽光を利用する全ての技術。
JP2008198965A (ja) 鏡集光発電機
JPH09310923A (ja) 太陽集光熱レンズヒーター
WO2014053444A2 (fr) Ensemble collecteur de rayonnement solaire ayant un élément défocalisant, champ solaire ayant l'ensemble collecteur de rayonnement solaire et utilisation du champ solaire

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15893336

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15893336

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP