WO1993010406A1 - Device for the utilization of solar energy - Google Patents

Device for the utilization of solar energy Download PDF

Info

Publication number
WO1993010406A1
WO1993010406A1 PCT/EP1991/002177 EP9102177W WO9310406A1 WO 1993010406 A1 WO1993010406 A1 WO 1993010406A1 EP 9102177 W EP9102177 W EP 9102177W WO 9310406 A1 WO9310406 A1 WO 9310406A1
Authority
WO
WIPO (PCT)
Prior art keywords
vapor pipe
pipe
vapor
steam
mirror
Prior art date
Application number
PCT/EP1991/002177
Other languages
French (fr)
Inventor
Kari Ven
Juha Ven
Timo Ven
Petri Ven
Irja Ven
Original Assignee
Common Plum Company N.V.
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 Common Plum Company N.V. filed Critical Common Plum Company N.V.
Priority to PCT/EP1991/002177 priority Critical patent/WO1993010406A1/en
Publication of WO1993010406A1 publication Critical patent/WO1993010406A1/en

Links

Classifications

    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/80—Accommodating differential expansion of solar collector elements
    • 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 invention relates to a device for tne utilization of solar energy, which device comprises a vapor pipe with at least one expansion bend therein, at least one device for capturing solar rays and concentrating these solar rays on a part of the vapor pipe and at least one device mounted on the vapor pipe for injecting liquid to be vaporized.
  • a device of this type is among others described in BE-A-902 768.
  • the device for capturing solar rays is an elongated curved mirror.
  • the vapor pipe extends along the focal line of this mirror.
  • This vapor pipe is normally manufactured of metal and as a result of relatively great temperature changes undergoes relatively large expansions and contractions. These expansions and contractions are absorbed by expansion bends, namely one upstream from each mirror.
  • a device for injecting water is mounted at the location of each expansion bend. Expansion loops are less expensive than expansion bellows which are utilized in other known devices for absorbing expansions and contractions.
  • the vapor pipe including the expansion bend is horizontal and/or inclined in one and the same direction so that the injected liquid cannot accumulate in this pipe.
  • the device for injecting liquid is connected to the vapor pipe at the location of an expansion bend.
  • the device for capturing and concentrating solar rays comprises an elongated curved mirror in the focal line of which the vapor pipe is disposed.
  • an expansion bend is provided almost every 30 meters in the vapor pipe.
  • the vapor pipe extends in a plane of which the direction is almost horizontal, perpendicular to the part of the vapor pipe at the location of the device for capturing and concentrating the solar rays.
  • the vapor pipe can even extend in an entirely horizontal plane.
  • Figure 1 shows a schematically maintained side view of a device for the utilization of solar energy according to the invention
  • figure 2 shows a schematically maintained top view of the device from figure 1.
  • the device for the utilization of solar energy principally comprises a number of rotatable, elongated curved mirrors 1, on the focal line of which extends a vapor pipe 2.
  • each mirror 1 is in itself also known. It can for example be manufactured as described in BE-A-901 639. It is in a rotatable manner, for example as described in the Belgian patent application no. 89 00 944, mounted on a support 3 and is continuously directed toward the sun.
  • the vapor pipe 2 is mounted on bearings in relation to the mirrors 1 so that this vapor pipe 2 remain stationary when the mirrors 1 are rotated.
  • the pipe 2 is formed by a steel pipe which at the location of each mirror 1 is lagged by an insulating jacket of glass which allows in the solar rays from outside but keeps in the heat.
  • water is evaporated to steam or water vapor, or already formed water vapor is further heated to superheated steam.
  • water is injected upstream from each mirror 1 by means of an injection device 4.
  • This injection device 4 connects to the vapor pipe 2 at the location of an expansion bend 5 so that the injection takes place axially in the vapor pipe 2, in the direction of the mirror 1 situated downstream.
  • Characteristic of the invention is the fact that the vapor pipe 2 extends horizontally and/or inclined in the same direction so that liquid flows away in the pipe and cannot accumulate. The development of a local trough where a water pocket could form, is thus prevented.
  • the vapor pipe 2 can consist of horizontal parts and inclined parts it preferably extends in one same plane of which the direction is almost horizontal diagonal to the parts of the vapor pipe 2 on which the mirrors 1 are mounted.
  • the vapor pipe 2 can also even be horizontal in the direction parallel to the latter named parts in which case the vapor pipe 2 therefore extends in a horizontal plane.
  • the inner diameter of the vapor pipe 1 is so chosen that the speed of the water vapor or steam is lower than 8 m/s and preferably amounts from 3 to 5 m/s in the part where saturated steam is produced and is lower than 15 m/s in the part where saturated steam becomes superheated.-
  • a metal tube of 3 inches is usually suitable for this purpose.

Abstract

Device for the utilization of solar energy, which device comprises a vapor pipe (2) with at least one expansion bend (5) therein, at least one device (1) for capturing solar rays and concentrating them on part of the vapor pipe (2) and at least one device (4) mounted on the vapor pipe (2) for injecting liquid to be vaporized, characterized in that the vapor pipe (2) including the expansion bend (5), is horizontal and/or inclined in one and the same direction so that the injected liquid cannot accumulate in this pipe (2).

Description

Device for the utilization of solar energy,
The invention relates to a device for tne utilization of solar energy, which device comprises a vapor pipe with at least one expansion bend therein, at least one device for capturing solar rays and concentrating these solar rays on a part of the vapor pipe and at least one device mounted on the vapor pipe for injecting liquid to be vaporized.
A device of this type is among others described in BE-A-902 768. The device for capturing solar rays is an elongated curved mirror. The vapor pipe extends along the focal line of this mirror. This vapor pipe is normally manufactured of metal and as a result of relatively great temperature changes undergoes relatively large expansions and contractions. These expansions and contractions are absorbed by expansion bends, namely one upstream from each mirror. A device for injecting water is mounted at the location of each expansion bend. Expansion loops are less expensive than expansion bellows which are utilized in other known devices for absorbing expansions and contractions.
With this known device according to BE-A-902 768 the danger also exists that water accumulates in the vapor pipe, which can result in water shock. This causes vibrations in the vapor pipe through which the pipe or its covering can be damaged. It is indeed usual to lag the vapor pipe at the location of the mirrors with a covering of glass that allows the solar rays through but restricts the heat radiation toward the outside. Through water shock this glass covering could break. "The purpose of the invention is to remedy this disadvantage and to provide a device for the utilization of solar energy whereby the vapor pipe is provided with at least one expansion bend but the development of liquid shock in the vapor pipe is avoided.
For this purpose the vapor pipe including the expansion bend is horizontal and/or inclined in one and the same direction so that the injected liquid cannot accumulate in this pipe.
Since liquid cannot accumulate no liquid shock can develop. For the same purpose water separators are mounted on the vapor pipe in other known devices for the utilization of solar energy, but such water separators are relatively costly so that the whole device becomes relatively expensive because of that.
In a particular embodiment of the invention the device for injecting liquid is connected to the vapor pipe at the location of an expansion bend.
In a notable embodiment of the invention the device for capturing and concentrating solar rays comprises an elongated curved mirror in the focal line of which the vapor pipe is disposed.
Suitably an expansion bend is provided almost every 30 meters in the vapor pipe.
In a preferably applied embodiment of the invention the vapor pipe extends in a plane of which the direction is almost horizontal, perpendicular to the part of the vapor pipe at the location of the device for capturing and concentrating the solar rays.
The vapor pipe can even extend in an entirely horizontal plane.
Other details and advantages of the invention will appear from the following description of a device for the utilization of solar energy according to the invention. This description is only given as example and does not restrict the invention. The reference figures refer to the enclosed drawings, in which:
Figure 1 shows a schematically maintained side view of a device for the utilization of solar energy according to the invention;
figure 2 shows a schematically maintained top view of the device from figure 1.
The device for the utilization of solar energy according to the figures principally comprises a number of rotatable, elongated curved mirrors 1, on the focal line of which extends a vapor pipe 2.
In itself such a device is known among others from BE-A-902 768. It serves for the preparation of water vapor for driving a turbine for producing current.
The construction of each mirror 1 is in itself also known. It can for example be manufactured as described in BE-A-901 639. It is in a rotatable manner, for example as described in the Belgian patent application no. 89 00 944, mounted on a support 3 and is continuously directed toward the sun.
The vapor pipe 2 is mounted on bearings in relation to the mirrors 1 so that this vapor pipe 2 remain stationary when the mirrors 1 are rotated. The pipe 2 is formed by a steel pipe which at the location of each mirror 1 is lagged by an insulating jacket of glass which allows in the solar rays from outside but keeps in the heat.
In the part of the vapor pipe 2 at the location of a mirror 1, with solar rays, water is evaporated to steam or water vapor, or already formed water vapor is further heated to superheated steam. Viewed in relation to the direction of flow of the water vapor, water is injected upstream from each mirror 1 by means of an injection device 4.
This injection device 4 connects to the vapor pipe 2 at the location of an expansion bend 5 so that the injection takes place axially in the vapor pipe 2, in the direction of the mirror 1 situated downstream.
Upstream from each mirror 1 such an expansion bend 5 is provided in the vapor pipe 2 which is even double and extends almost in the shape of a Z with a projection on both sides and whereby the parts of the pipe 2 on both sides of the loop 5 extend in each others extension.
Characteristic of the invention is the fact that the vapor pipe 2 extends horizontally and/or inclined in the same direction so that liquid flows away in the pipe and cannot accumulate. The development of a local trough where a water pocket could form, is thus prevented.
Although the vapor pipe 2 can consist of horizontal parts and inclined parts it preferably extends in one same plane of which the direction is almost horizontal diagonal to the parts of the vapor pipe 2 on which the mirrors 1 are mounted. The vapor pipe 2 can also even be horizontal in the direction parallel to the latter named parts in which case the vapor pipe 2 therefore extends in a horizontal plane.
Without water separators being necessary no water accumulations can develop in the vapor pipe 2 through which therefore water shock and damages caused through that are prevented.
The formation of water pockets in the vapor pipe is not only counteracted by the correct choice of inclination of the vapor pipe 2 but at the same time by reducing the speed of the vapor through the pipe 2.
Although the maximum speed of flow amounts to 65 m/s the inner diameter of the vapor pipe 1 is so chosen that the speed of the water vapor or steam is lower than 8 m/s and preferably amounts from 3 to 5 m/s in the part where saturated steam is produced and is lower than 15 m/s in the part where saturated steam becomes superheated.- A metal tube of 3 inches is usually suitable for this purpose.
The present invention is in no way restricted to the embodiment described above and within the scope of the patent application many changes can be applied to the described embodiment, among others with regard to the form, the composition, the arrangement and the number of the elements which are utilized for the realization thereof.

Claims

Claims.
1.- Device for the utilization of solar energy, which device comprises a vapor pipe (2) with at least one expansion bend (5) therein, at least one device (1) for capturing solar rays and concentrating them on a part of the vapor pipe (2) and at least one device (4) mounted on the vapor pipe (2) for injecting liquid to be vaporized, characterized in that the vapor pipe (2) including the expansion bend (5), is horizontal and/or inclined in one and the same direction so that the injected liquid cannot accumulate in this pipe (2).
2.- Device according to the preceding claim, characterized in that the device (4) for injecting liquid is connected to the vapor pipe (2) at the location of an expansion bend (5).
3.- Device according to either of the preceding claims, characterized in that the device (1) for capturing and concentrating solar rays comprises an elongated curved mirror in the focal line of which the vapor pipe (2) is disposed.
4.- Device according to the preceding claim, characterized in that the elongated mirror (1 ) is mounted rotatably on a support (3) and the vapor pipe (2) is mounted on bearings in relation to this mirror (1 ) and with rotation of the mirror (1) remains stationary.
5.- Device according to one of the preceding claims, characterized in that almost every 30 meters an expansion bend (5) is provided in the vapor pipe (2).
6 - Device according to one of the preceding claims, characterized in that it comprises several devices (1 ) for capturing and concentrating solar rays, the vapor pipe (2) of all these devices (1 ) is common and comprises several expansion bends (5).
7.- Device according to any of the preceding claims, characterized in that the vapor pipe (2) extends in a plane of which the direction is almost horizontal, perpendicular to the part of the vapor pipe (2) at the location of the device (1) for capturing and concentrating the solar rays.
8.- Device according to the preceding claim, characterized in that the vapor pipe (2) extends in horizontal plane.
9.- Device according to any of the preceding claims, characterized in that the vapor pipe (2) is a steam pipe and has such an inner diameter that the speed of the steam is lower than 8 m/s there where saturated steam is produced.
10.- Device according to any of the preceding claims, characterized in that the vapor pipe (2) is a steam pipe and, at least there where the superheating of the steam takes place, has such an inner diameter that the speed of the steam there is lower than 15 m/s.
PCT/EP1991/002177 1991-11-14 1991-11-14 Device for the utilization of solar energy WO1993010406A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1991/002177 WO1993010406A1 (en) 1991-11-14 1991-11-14 Device for the utilization of solar energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1991/002177 WO1993010406A1 (en) 1991-11-14 1991-11-14 Device for the utilization of solar energy

Publications (1)

Publication Number Publication Date
WO1993010406A1 true WO1993010406A1 (en) 1993-05-27

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ID=8165622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/002177 WO1993010406A1 (en) 1991-11-14 1991-11-14 Device for the utilization of solar energy

Country Status (1)

Country Link
WO (1) WO1993010406A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025247A1 (en) * 1994-03-17 1995-09-21 Siemens Aktiengesellschaft Method and device for solar steam generation
WO1997014284A2 (en) * 1995-10-17 1997-04-24 Siemens Aktiengesellschaft Method and device for producing solar steam
WO2011044281A3 (en) * 2009-10-07 2012-03-29 Areva Solar, Inc. Multi-tube solar thermal receiver

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE263950C (en) * 1900-01-01
FR2334070A1 (en) * 1975-12-04 1977-07-01 Euratom SOLAR COLLECTOR
FR2353812A1 (en) * 1976-06-03 1977-12-30 Bertin & Cie CYLINDROPARABOLIC MIRROR SOLAR ENERGY SENSOR SYSTEM
GB1566797A (en) * 1976-10-27 1980-05-08 Nat Res Dev Solar radiation tracking device
EP0125853A1 (en) * 1983-05-10 1984-11-21 Francisco Javier Rosende Barturen Solar radiation collector
EP0206434A1 (en) * 1985-06-28 1986-12-30 Juha Ven Evaporator apparatus and electric power plant equipped with such an evaporator apparatus
GB2235786A (en) * 1989-09-04 1991-03-13 Kari Ven Mirror construction

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE263950C (en) * 1900-01-01
FR2334070A1 (en) * 1975-12-04 1977-07-01 Euratom SOLAR COLLECTOR
FR2353812A1 (en) * 1976-06-03 1977-12-30 Bertin & Cie CYLINDROPARABOLIC MIRROR SOLAR ENERGY SENSOR SYSTEM
GB1566797A (en) * 1976-10-27 1980-05-08 Nat Res Dev Solar radiation tracking device
EP0125853A1 (en) * 1983-05-10 1984-11-21 Francisco Javier Rosende Barturen Solar radiation collector
EP0206434A1 (en) * 1985-06-28 1986-12-30 Juha Ven Evaporator apparatus and electric power plant equipped with such an evaporator apparatus
GB2235786A (en) * 1989-09-04 1991-03-13 Kari Ven Mirror construction

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025247A1 (en) * 1994-03-17 1995-09-21 Siemens Aktiengesellschaft Method and device for solar steam generation
US5806317A (en) * 1994-03-17 1998-09-15 Siemens Aktiengesellschaft Method and device for solar steam generation
WO1997014284A2 (en) * 1995-10-17 1997-04-24 Siemens Aktiengesellschaft Method and device for producing solar steam
WO1997014284A3 (en) * 1995-10-17 1997-07-03 Siemens Ag Method and device for producing solar steam
WO2011044281A3 (en) * 2009-10-07 2012-03-29 Areva Solar, Inc. Multi-tube solar thermal receiver
AU2010303499B2 (en) * 2009-10-07 2015-07-30 Areva Solar, Inc. Multi-tube solar thermal receiver

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