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US20130068216A1 - Expansion system in the heat-transfer-medium circuit of a solar-thermal power plant - Google Patents

Expansion system in the heat-transfer-medium circuit of a solar-thermal power plant Download PDF

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Publication number
US20130068216A1
US20130068216A1 US13/637,957 US201113637957A US2013068216A1 US 20130068216 A1 US20130068216 A1 US 20130068216A1 US 201113637957 A US201113637957 A US 201113637957A US 2013068216 A1 US2013068216 A1 US 2013068216A1
Authority
US
United States
Prior art keywords
expansion
heat transfer
transfer medium
expansion system
section
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.)
Abandoned
Application number
US13/637,957
Other languages
English (en)
Inventor
Frieder Gräter
Francesco La Porta
Wolfhard Bickmeyer
Christian Möbius
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.)
Flagsol GmbH
Original Assignee
Flagsol GmbH
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 Flagsol GmbH filed Critical Flagsol GmbH
Assigned to FLAGSOL GMBH reassignment FLAGSOL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOBIUS, CHRISTIAN, BICKMEYER, WOLFHARD, PORTA, FRANCESCO LA, GRATER, FRIEDER
Publication of US20130068216A1 publication Critical patent/US20130068216A1/en
Abandoned legal-status Critical Current

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Classifications

    • F24J2/4636—
    • 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 is directed towards an expansion system of the heat transfer medium circuit of a solar thermal power plant, comprising a plurality of expansion tanks and/or flooding tanks which are arranged in the heat transfer medium circuit.
  • the invention is directed towards a solar thermal power plant with a solar field which is formed from parabolic trough collectors.
  • the heat which is contained in the steam is converted into useful energy, for example into electric energy via a generator which is connected to the turbine.
  • a thermal oil is customarily used as heat transfer medium or heat exchanging medium.
  • the temperature difference in the heat transfer medium circuit which occurs during operation of such a solar thermal power plant for example when changing from day to night, and, associated therewith, on account of varying volumes of heat transfer medium which for example is hotter during the day than at night, provision must be made for a compensating or expansion system which balances out and compensates the volumetric expansions of the heat transfer medium circuit in the case of increased temperature.
  • an expansion system consisting of an elevated expansion tank which is arranged several meters above ground level and with a plurality of flooding tanks which are arranged at a level beneath it and are in fluid-conducting communication with the expansion tank, wherein, depending on the size of the power plant, a plurality of flooding tanks are provided.
  • a gas cushion of nitrogen (N 2 ) is formed in the expansion tank and is located above the fluid level of the heat transfer medium in the expansion tank.
  • the known expansion tank is arranged at the highest point of the heat transfer medium circuit.
  • the expansion tank is provided with a vent valve in order to be able to blow off developing gas portions, for example oil vapor, of the heat transfer medium.
  • the expansion tank is connected to the flooding tanks in order to be able to adapt an adjustment of the filling level of the expansion tank to the varying operating conditions. Furthermore, the pumps and valves are designed with a redundancy feature so that the operating reliability of the expansion system is ensured.
  • a disadvantage with this prior art is the high investment cost associated therewith, which arises from the fact that the flooding tanks and the expansion tank have to be arranged at different heights above ground level so that the heat exchanging system, of which the expansion system is a component part, has to be constructed in at least two tiers at different heights.
  • valves and pumps have to be provided in double the number. This also leads to the internal energy consumption of the power plant being relatively high since the pumps which are provided with the redundancy feature consume electric power. Finally, an (increased) risk of failure and corresponding maintenance and repair expenditure are also associated with the presence of pumps and valves. Also, the entire system must be incorporated into the plant control system of the solar thermal power plant.
  • the invention is therefore based on the object of creating a solution which enables a technically simplified and constructionally less costly expansion system to be created.
  • the expansion system comprising a plurality of expansion tanks which are arranged basically at the same height level and are in fluid-conducting communication with each other.
  • the expansion tanks are in fluid-conducting communication with each other so that without pumps or other valves the fluid can flow from one expansion tank independently into an adjacent expansion tank, wherein the fluid-conducting connections are formed below the fluid level in the individual expansion tanks and consequently the same fluid level of heat transfer medium is established overall in all the expansion tanks across the number of expansion tanks which are provided in each case. In this way, pumps and valves between the expansion tanks are no longer necessary, which significantly reduces maintenance and repair operations.
  • the expansion system comprises at least one expansion tank, preferably a plurality of expansion tanks, which is, or are, mounted at ground level and in fluid-conducting communication with the heat transfer medium circuit.
  • the invention provides that at least one expansion tank is in fluid-conducting communication with a cross-sectionally widened section of a pipe of the heat transfer medium circuit which conducts the heat transfer medium.
  • the forming of a cross-sectionally widened section inside the pipe which circulates the heat transfer medium enables degassing of, for example, oil vapor which develops in the expansion tanks since in the widened pipe section the flow velocity of the heat transfer medium is reduced and therefore discharge of gas from the fluid flow is made easier.
  • the invention is furthermore distinguished by the fact that the cross-sectionally widened pipe section, at least in the upstream direction of the heat transfer medium circuit, has a transition section, preferably with a uniformly constant change of cross section, which opens into the normal cross section of the pipe which conducts the heat transfer medium.
  • the invention furthermore provides that the cross-sectionally widened pipe section, in the upstream direction and in the downstream direction of the heat transfer medium, has in each case a transition section, preferably with a uniformly constant change of cross section, which opens into the normal cross section of the pipe which conducts the heat transfer medium.
  • the number of expansion tanks with which the expansion system is equipped depends individually upon the respective plant size, and by the same token the size of the individual expansion tanks is designed depending upon the design and capacity of the heat transfer medium circuit and of the solar thermal power plant. In this case, the size of the individual expansion tanks is basically limited by the respectively selected production processes and also transporting procedures.
  • the invention additionally provides that at least one expansion tank has a safety valve in the form of a pressure relief valve.
  • the invention furthermore provides that at least one expansion tank has a degassing valve. If the gas chambers or gas cushion chambers of the individual expansion tanks are interconnected in fluid-conducting communication via a pipe in which the degassing valve is arranged, then, from a control room, for example, the degassing valve can be operated as a blow-off valve and in this way a uniform degassing of all the expansion tanks which are provided and in fluid-conducting communication with the degassing valve can be carried out.
  • the invention therefore also provides that the degassing valve can be controlled, via a signal line, from a control room.
  • the invention in the embodiment of the solar thermal power plant is distinguished by the fact that it exclusively has an expansion system, or a plurality of expansion systems, according to one of claims 1 - 10 .
  • FIG. 1 shows in a schematic representation the heat transfer medium circuit 1 of a solar thermal power plant, which circuit is represented schematically and symbolized by a pipeline 2 which is routed in a circular manner.
  • the heat transfer medium circuit 1 Formed in the heat transfer medium circuit 1 is the solar field 3 , equipped with parabolic trough collectors, in which the heat transfer medium 6 , which is moved in the heat transfer medium circuit 1 by a pump 5 , or a plurality of pumps, in the flow direction 4 , absorbs reflected solar radiation, reflected by the mirror surface of the parabolic trough collectors, in the form of heat.
  • the heated heat transfer medium 6 gives off heat to the water/steam cycle 8 of the solar thermal power plant in a heat transfer stage 7 which has a plurality of heat exchangers. Downstream of the heat transfer stage 7 and upstream of the pump 5 , a cross-sectionally widened section 10 is then formed in a pipe 9 of the heat transfer circuit 1 .
  • a transition section is formed at both ends of the cross-sectionally widened section 10 in each case, along which transition section is formed a constant change of cross section from the cross section of the cross-sectionally widened pipe section 10 to the cross section of the pipe 9 which conducts the heat transfer medium 6 in this region so that this transition section from the cross-sectionally widened pipe section 10 opens into the normal cross section of the pipe 9 .
  • the cross-sectionally widened pipe section 10 is a component part of the expansion system which is represented as a dashed line 11 .
  • the expansion tanks 12 a, 12 b and 12 c are basically positioned at the same height and in their lower regions are interconnected in each case by fluid pipes 14 a, 14 b so that a volume of heat transfer medium 6 forms and collects in each case inside the expansion tanks 12 a, 12 b, 12 c in such a way that the same level of the fluid surface is achieved in all three expansion vessels.
  • the fluid-conducting connection which is such that it is an intercommunicating connection—between the individual expansion tanks 12 a, 12 b, 12 c, it is no longer necessary to design and to arrange pumps or valves between these expansion tanks and in the fluid pipes 14 a, 14 b.
  • the exchange of fluid between the individual expansion tanks is carried out automatically.
  • each of the expansion tanks 12 a, 12 b, 12 c is equipped with a gas cushion consisting of protective gas, for example nitrogen in the exemplary embodiment.
  • a gas cushion consisting of protective gas, for example nitrogen in the exemplary embodiment.
  • the pressure in each of the expansion tanks 12 a, 12 b , 12 c is equal and the same protective gas is also provided in each expansion tank.
  • the chambers 15 a, 15 b, 15 c which have the gas cushions are in fluid-conducting communication with each other via pipes 16 a , 16 b, 16 c.
  • a vent valve 17 is arranged in the pipes 16 a, 16 b, 16 c and, in a way not shown, is in functional communication, via a signal line, with a control center or control room, from which control room the vent valve can be controlled and, depending upon the desired degassing, blowing off of gas from the gas cushions of the expansion tanks 12 a, 12 b, 12 c is possible as a result.
  • At least one of the expansion tanks 12 a, 12 b, 12 c is also equipped with a safety valve 18 which is formed as a pressure relief valve which blows off gas from the expansion system 11 in the event of impermissibly high gas pressure.
  • the expansion system 11 comprises three expansion tanks 12 a, 12 b , 12 c, then this, however, can comprise any number of expansion tanks, but at least one which is selected and designed depending upon the size and design of the heat transfer medium circuit 1 and of the water/steam cycle and upon the capacity of the solar thermal power plant.
  • the expansion tanks 12 a, 12 b, 12 c are mounted at ground level with a drop to the pipe section 10 in order to prevent dry running of the pump(s) 5 and therefore to be easily reachable for maintenance and/or repair purposes.

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  • 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)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
US13/637,957 2010-03-31 2011-03-29 Expansion system in the heat-transfer-medium circuit of a solar-thermal power plant Abandoned US20130068216A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010013735A DE102010013735A1 (de) 2010-03-31 2010-03-31 Ausdehnungssystem des Wärmeträgermedium-Kreislaufs eines solarthermischen Kraftwerks
DE102010013735.9 2010-03-31
PCT/EP2011/054804 WO2011120957A1 (de) 2010-03-31 2011-03-29 Ausdehnungssystem des wärmeträgermedium-kreislaufs eines solarthermischen kraftwerks

Publications (1)

Publication Number Publication Date
US20130068216A1 true US20130068216A1 (en) 2013-03-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/637,957 Abandoned US20130068216A1 (en) 2010-03-31 2011-03-29 Expansion system in the heat-transfer-medium circuit of a solar-thermal power plant

Country Status (5)

Country Link
US (1) US20130068216A1 (de)
EP (1) EP2553354A1 (de)
CN (1) CN102893102A (de)
DE (1) DE102010013735A1 (de)
WO (1) WO2011120957A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3011576A1 (fr) * 2013-10-03 2015-04-10 Marine Master Generateur de puissance mecanique et procede associe de generation de puissance mecanique
CN109780740A (zh) * 2019-03-13 2019-05-21 孔宇庭 一种介质自动补偿管路及太阳能导热管路

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007776A (en) * 1974-12-23 1977-02-15 Universal Oil Products Company Heating and cooling system utilizing solar energy
US4044949A (en) * 1976-02-26 1977-08-30 Ernst Morawetz Heat storage system
US4173994A (en) * 1977-12-30 1979-11-13 Hiser Leland L Solar energy heating and cooling apparatus and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2324952A1 (de) * 1973-05-15 1974-12-05 Record Apparatebau Gmbh Druckausdehnungsgefaess-batterie
DE4239286A1 (de) * 1992-11-23 1994-08-04 Ilka Luft Und Kaeltetechnik Gm Sonnenkollektor zur Wassererwärmung
DE19653776C1 (de) * 1996-12-21 1998-04-30 Winkelmann & Pannhoff Gmbh Ausdehnungsgefäß
EP0945686A3 (de) * 1998-03-24 2001-09-12 Stücklin & Cie AG Druckhaltevorrichtung mit innerhalb einer Flüssigkeitsaufnahmekammer angeordneter Pumpe
US7191597B2 (en) * 2003-01-21 2007-03-20 Los Angeles Advisory Services, Inc. Hybrid generation with alternative fuel sources
EP1508750A3 (de) * 2003-08-18 2005-11-16 Winkelmann Palsis Motortechnik GmbH & Co. KG Ausdehnungsgefäss

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007776A (en) * 1974-12-23 1977-02-15 Universal Oil Products Company Heating and cooling system utilizing solar energy
US4044949A (en) * 1976-02-26 1977-08-30 Ernst Morawetz Heat storage system
US4173994A (en) * 1977-12-30 1979-11-13 Hiser Leland L Solar energy heating and cooling apparatus and method

Also Published As

Publication number Publication date
WO2011120957A1 (de) 2011-10-06
DE102010013735A1 (de) 2011-10-06
EP2553354A1 (de) 2013-02-06
CN102893102A (zh) 2013-01-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FLAGSOL GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GRATER, FRIEDER;PORTA, FRANCESCO LA;BICKMEYER, WOLFHARD;AND OTHERS;SIGNING DATES FROM 20121008 TO 20121010;REEL/FRAME:029459/0844

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION