WO2017168361A1 - Joint pour installations solaires de concentration - Google Patents

Joint pour installations solaires de concentration Download PDF

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Publication number
WO2017168361A1
WO2017168361A1 PCT/IB2017/051824 IB2017051824W WO2017168361A1 WO 2017168361 A1 WO2017168361 A1 WO 2017168361A1 IB 2017051824 W IB2017051824 W IB 2017051824W WO 2017168361 A1 WO2017168361 A1 WO 2017168361A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
unit according
joint
flange
pipes
Prior art date
Application number
PCT/IB2017/051824
Other languages
English (en)
Inventor
Paolo PIACENTI
Fabrizio RAGNI
Massimiliano Borasso
Original Assignee
Meccanotecnica Umbra S.P.A.
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 Meccanotecnica Umbra S.P.A. filed Critical Meccanotecnica Umbra S.P.A.
Priority to CN201780021350.8A priority Critical patent/CN108884956B/zh
Publication of WO2017168361A1 publication Critical patent/WO2017168361A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
    • F16L27/0804—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another
    • F16L27/0808—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation
    • F16L27/0824—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with ball or roller bearings
    • F16L27/0828—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with ball or roller bearings having radial bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
    • F16L25/01—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means specially adapted for realising electrical conduction between the two pipe ends of the joint or between parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L27/00—Adjustable joints, Joints allowing movement
    • F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
    • F16L27/0804—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another
    • F16L27/0808—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation
    • F16L27/0812—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with slide bearings
    • F16L27/082—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with slide bearings having axial sealing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
    • F24S30/425—Horizontal axis
    • 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
    • F24S80/30—Arrangements for connecting the fluid circuits of solar collectors with each other or with other components, e.g. pipe connections; Fluid distributing means, e.g. headers
    • 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
    • Y02E10/47—Mountings or tracking

Definitions

  • the present invention relates to a joint for concentration solar plants .
  • Concentration solar plants comprise a plurality of parabolic mirrors (parabolic troughs) to concentrate solar energy on respective receiving pipes arranged in the focuses of the mirrors, through which a heat transfer fluid flows .
  • the high temperatures reached by the heat transfer fluid allow using the accumulated heat to produce through a heat exchanger supersaturated steam that can, for instance, rotate a turbine and produce electric energy.
  • the mirrors are configured so as to rotate following the apparent motion of the sun. Therefore, during the day, the receiving pipes rotate integrally with the parabolic mirrors and are mutually connected by means of fixed ground pipes .
  • the efficiency of the CSP plant is closely linked to the maximum temperature reached by the heat transfer fluid. Therefore, the use of substances that can be stable at high temperatures is of interest.
  • diathermic oil as a heat transfer fluid sets an upper limit to the operating temperatures, which may not exceed 400°C.
  • these substances have relatively high solidification temperatures if compared to diathermic oil, with values that may even reach 240 °C.
  • the use of these substances allows increasing the energy efficiency of the plant, but on the other hand it poses further technical requirements, such as the need to prevent the solidification of the heat transfer fluid, which beside forming inclusions in the pipe can damage its structure during the solid residues melting step due to a simultaneous volume increase from the solid phase to the liquid phase.
  • the pipe is traversed by a low voltage and high amperage current (about 400 A) to maintain a temperature able to prevent the solidification of the fluid by means of the Joule effect.
  • the object of the present invention is to provide a connection unit between the fixed and the movable pipes of a CSP plant, which allows solving the aforesaid problems.
  • Figure 1 is a perspective view of a connection unit made according to the present invention.
  • Figure 2 is a side view of the unit of Figure 1 in a partial section
  • Figure 3 is a partially sectioned perspective view of the unit of Figure 1, with parts removed for clarity's sake;
  • Figure 4 is a section along the line IV-IV of Figure 2;
  • Figure 5 is an enlargement of the detail X of Figure 3; and
  • Figure 6 is a perspective view of a second embodiment of the invention.
  • the reference number 1 indicates as a whole a connection unit for sealingly connecting two coaxial, mutually rotating, pipes 2, 3 (partially shown) .
  • the pipe 2 can be formed by a fixed ground pipe;
  • the pipe 3 can be formed by a connection pipe with the receiving pipe of a parabolic mirror of a CSP system (not shown) employing a heat transfer fluid at a high temperature of solidification, e.g. NaN03+KN03.
  • the pipe 3 is preferably a flexible pipe.
  • the connection unit essentially comprises:
  • connection between the unit 1 and the pipe 3 is conveniently achieved by means of a second end pipe 8 and a conductive joint 9 connecting the second intermediate pipe 7 to the second end pipe 8 and axially interposed between them.
  • the pipes 4, 5, 7, 8 are made of a conductive metallic material and are coaxial to each other and to the rotary joint 11.
  • the insulating joint 6 comprises a flange 15 fixed to the first end pipe 4, a flange 16 fixed to the first intermediate pipe 5 and an electrically insulating spacer 17 (e.g. mica) interposed between the two facing flanges 15, 16.
  • the flange 15 comprises a radial conductive appendage 19, whose function will be explained below.
  • the flanges 15, 16 are conveniently welded to the respective pipes 4, 5, and are removably connected, preferably by means of a plurality of bolts 20.
  • the conductive joint 9 similar to the insulating joint 6 but with a conductive gasket, comprises a flange 25 fixed to the second pipe 7 and a flange 26 fixed to the second end pipe 8.
  • the flange 25 comprises a radial conductive appendage 27, whose function will be explained below.
  • the flanges 25, 26 are conveniently welded to the respective pipes 7, 8, and are removably connected, preferably by means of a plurality of bolts 28.
  • the rotary joint 11 ( Figures 2 and 3) essentially comprises a seal 30 formed by a pair of facing sealing rings 31, 32 having an axial contact and pushed one against the other by respective metal bellows 33 34, axially interposed between each sealing ring 31, 32 and the respective intermediate pipe 5, 7.
  • the seal 30 is enclosed by a casing 35 comprising a bell- shaped element 36 fixed on a flange 37 of the first intermediate pipe 5 and an outer cylindrical portion 38 axially extending from the bell-shaped element 36 toward the second pipe 7.
  • the casing 35 also comprises a wall 39 fixed to a flange 40 of the second pipe 7 and facing the bell-shaped element 36, on the opposite side of the seal 30 with respect to this latter and inside the cylindrical portion 38.
  • a bearing 41 is interposed between the cylindrical portion 38 and the wall 39 to allow their relative rotation .
  • the casing 35 further encloses a heating element 42 clearly visible in Figures 3 and 4.
  • the heating element 42 comprises a C-shaped metallic heating body 43 housing the seal 30 and fixed to the bell-shaped element 36 by means of a plurality of axial screws 44 passing through the bell-shaped element ( Figure 5) .
  • the screws 44 are electrically insulated with respect to the bell-shaped element 36 by an insulating bushing 45 and an insulating spacer 46.
  • the heating element 42 further comprises a pair of electric terminals formed by parallel appendages 47, 48 extending from the free ends of the heating body 43.
  • the appendage 47 is electrically connected to the appendage 19 of the flange 15 by means of a shaped strap 49.
  • the appendage 48 is electrically connected to the appendage 27 of the flange 25 by means of a flexible cable 50.
  • the heating body 43 is provided with a vertical through hole 51 arranged below the seal 30 ( Figures 4 and 5) to allow the passage of any micro-leaks which can leave the casing 35 through a drain pipe 52 with a vertical axis passing through the cylindrical portion 38 under the heating element 42.
  • the unit 1 operates as follows.
  • the seal 30 allows a relative rotation between the pipes 2, 3 and ensures the hydraulic seal thanks to the elastic thrust of the bellows 33, 34 on the sealing rings 31, 32.
  • a low voltage and high amperage current which must be transmitted through the connection unit 1 from the pipe 2 to the pipe 3, flows through the plant in order to prevent the solidification of the heat transfer fluid.
  • the current flows from the pipe 2 to the first end pipe 4 and from this, by means of the flange 15, of the appendage 19 and of the strap 48, to the heating element 42. From this, the current flows through the cable 50 and the conductive joint 9 to the second end pipe 8 and then to the pipe 3.
  • the aforesaid elements thus form in their entirety a bypass circuit of the seal 30, to which the heating element 42 is connected in series.
  • the insulating joint 6 isolates the first intermediate pipe 5, and consequently the seal 30, from the first end pipe 4. Therefore, the sealing rings 31, 32 are not subjected to a passage of current and are equipotential . This avoids the formation of electric arcs between parts in relative motion.
  • the heating element 42 traversed by the current flowing through the plant, is heated by means of the Joule effect and heats the rotary joint 11, which would otherwise be "cold", since bypassed by the current as set forth above, and in particular the area of the seal 30 and of the bellows 33, 34, thus preventing the local solidification of the heat transfer fluid.
  • connection unit 1 solves the aforesaid problems associated with the prior art.
  • the unit 1 enables the relative rotation between the pipes 2 and 3 in the presence of high temperatures and of electric current circulating in the pipes, and uses the current to heat the sealing area. It is thus prevented, on the one hand, the solidification of the transfer fluid in the sealing area, and on the other hand, the production of electric arcs between parts in relative motion. Torsion fatigue stresses on the mechanical elements of the unit are also avoided.
  • the unit 1 can be directly installed on the main line of the CSP system, with no further connection or thermoregulation apparatuses, thus directly intercepting the current flowing along the plant.
  • the unit is easy to install, requires no maintenance and is easily removable for a replacement of the components in the event of a failure.
  • the second end pipe 8 forms part of the unit 1, and is connected to the second pipe 7 through an insulating joint 54 similar to the joint 6.
  • the flange 25 of the second pipe 7 is isolated from the flange 26 of the second end pipe 8 and the appendage 27 for connecting the cable 50 extends from the flange 26 and not from the flange 25.
  • This solution provides a redundant electric bypass that isolates the seal 30 from the current flow even in case of a failure of the joint 6.
  • the connection unit 1 may be subject to modifications and variations that do not depart from the scope of protection of the invention.
  • the joints 6, 9 and 11 may be made in a different way.
  • the first end pipe 4 and the second end pipe 8, if present, may be replaced by any end element securing the pipes 2 and 3 to an element of the joints 6 and 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pipe Accessories (AREA)
  • Joints Allowing Movement (AREA)
  • Resistance Heating (AREA)

Abstract

L'invention concerne une unité de raccordement pour raccorder de manière hermétique deux tuyaux (2, 3) traversés par un courant électrique et pouvant tourner l'un par rapport à l'autre, comprenant un premier élément d'extrémité (4) devant être raccordé à l'un des tuyaux (2), un premier tuyau intermédiaire (5), un joint d'isolation (6) intercalé entre le premier élément d'extrémité (4) et le premier tuyau intermédiaire (5), un second tuyau (7) devant être raccordé à un autre tuyau (3), un joint rotatif (11) raccordant de manière hermétique, avec une rotation relative possible, le premier tuyau intermédiaire (5) au second tuyau (7, 8), un circuit de dérivation (19, 49, 42, 50, 27) raccordant électriquement le premier élément d'extrémité (4) au second tuyau (7, 8), et un élément de chauffage (42) en série avec le circuit de dérivation et agencé dans le joint rotatif (11).
PCT/IB2017/051824 2016-03-30 2017-03-30 Joint pour installations solaires de concentration WO2017168361A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201780021350.8A CN108884956B (zh) 2016-03-30 2017-03-30 连接单元

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUA2016A002117A ITUA20162117A1 (it) 2016-03-30 2016-03-30 Giunto per impianti solari a concentrazione
IT102016000032632 2016-03-30

Publications (1)

Publication Number Publication Date
WO2017168361A1 true WO2017168361A1 (fr) 2017-10-05

Family

ID=56296958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/051824 WO2017168361A1 (fr) 2016-03-30 2017-03-30 Joint pour installations solaires de concentration

Country Status (3)

Country Link
CN (1) CN108884956B (fr)
IT (1) ITUA20162117A1 (fr)
WO (1) WO2017168361A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019106450A1 (fr) * 2017-12-01 2019-06-06 Meccanotecnica Umbra S.P.A. Joint pour fluide à haute température
ES2715513R1 (es) * 2017-12-01 2019-07-19 Umbra Meccanotecnica Junta para fluido a alta temperatura

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100025079A1 (en) * 2008-07-31 2010-02-04 Flynn William T Electrical bonding device for telescoping fluid line assembly
EP2525125A1 (fr) * 2011-05-19 2012-11-21 Huhnseal AB Joint axial de haute température et procédé
US20140008909A1 (en) * 2011-01-10 2014-01-09 Nunzio D'Orazio Connector for absorber tubes in a concentrating solar power plant

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
CN2392662Y (zh) * 1999-11-19 2000-08-23 东泰(成都)工业有限公司 金属骨架增强复合塑料管接头
DE102010032189A1 (de) * 2010-07-23 2012-01-26 Voss Automotive Gmbh Beheizbare Medienleitung und Verfahren zu deren Herstellung
EA201490880A1 (ru) * 2011-11-10 2014-10-30 Шоукор Лтд. Устройство, содержащее последовательно используемые зоны инфракрасного нагрева для трубчатых изделий
CN202493847U (zh) * 2012-03-21 2012-10-17 范华中 恒温输油、脂管
DE102012014746A1 (de) * 2012-07-26 2014-02-13 Mann + Hummel Gmbh Heizvorrichtung für eine Fluidleitung
CN105179866B (zh) * 2015-08-03 2018-02-06 科莱斯（天津）电热科技有限公司 凝结管道的智能电感应解凝系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100025079A1 (en) * 2008-07-31 2010-02-04 Flynn William T Electrical bonding device for telescoping fluid line assembly
US20140008909A1 (en) * 2011-01-10 2014-01-09 Nunzio D'Orazio Connector for absorber tubes in a concentrating solar power plant
EP2525125A1 (fr) * 2011-05-19 2012-11-21 Huhnseal AB Joint axial de haute température et procédé

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019106450A1 (fr) * 2017-12-01 2019-06-06 Meccanotecnica Umbra S.P.A. Joint pour fluide à haute température
ES2715513R1 (es) * 2017-12-01 2019-07-19 Umbra Meccanotecnica Junta para fluido a alta temperatura
US11384959B2 (en) 2017-12-01 2022-07-12 Meccanotecnica Umbra S.P.A. Joint for high temperature fluid

Also Published As

Publication number Publication date
CN108884956B (zh) 2021-06-15
CN108884956A (zh) 2018-11-23
ITUA20162117A1 (it) 2017-09-30

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