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
  • F16L59/00—Thermal insulation in general
  • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
  • F16L59/021—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves
  • F16L59/024—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves composed of two half sleeves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B37/00—Component parts or details of steam boilers
  • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
  • F22B37/36—Arrangements for sheathing or casing boilers

Definitions

• the invention relates to an insulating cassette as part of a shell of under medium pressure standing facilities of a steam generator, for example, as pipe jacket insulation with a substantially closed sheet metal housing, which completely encloses a Dämmstoff spallung.
• Such insulation cassettes are often used for thermal insulation of pipelines to steam generators.
• the known insulating cassettes are half-shell-shaped sheet-metal cassettes, which are filled with mineral wool, fiberglass wool or similar insulating materials. These are described for example in DE 29 23 094 A.
• the sheathing of the insulation is done by a blending of the insulating material, for example with zinc sheet.
• the use of closed insulation cassettes has been proven that completely enclose the insulation material.
• the sheet metal housing of the insulating cassettes should provide adequate protection against mechanical damage to the insulating material.
• Insulating cassettes of the type described above are provided for example for lines up to about 800 mm in diameter and an internal pressure of 160 bar at about 300 0 C media temperature. It is easy to imagine that the leak jet of such a line can enter relatively high mechanical forces in the Isolierkassette.
• the invention is therefore based on the object to improve an insulating cassette of the type mentioned in this regard.
• an insulating cassette as part of a jacket of devices under pressure of a steam generator, for example as pipe jacket insulation with a substantially closed sheet metal housing, which completely encloses a Dämmstoff spallung, wherein the insulating cassette is characterized in that the Dämmstoff spallung comprises an airgel.
• Airgel in general and within the meaning of the invention are to be understood as meaning highly porous solids in which up to 95% of the volume consists of pores.
• This material as a filling material for an insulating cassette has the advantage that, for example, material emerging from the insulating cassette is easier to bear out of a water cycle because of its physical properties.
• an inorganic airgel is provided as insulant filling, which is not wettable, which is buoyant and which is not flammable.
• an insulating cassette has been found in which the Dämmstoff spallung comprises a silicate airgel.
• silicate aerogels may, for example, have a pore diameter of about 20 nm with a porosity of> 90%.
• the density of the material can be between 90 and 100 kg / m 3 .
• the thermal conductivity can, for example, about 0.018 W / rn-K at 25 ° C.
• Such a material may have an inner surface area of about 600 to 800 m 2 / g. The material is therefore excellent as an insulating material for the purposes described above.
• silicate airgel a material having the trade name "Nanogel” marketed by CABOT Corporation can be used.
• the insulation filling comprises an airgel as granules, preferably with a mean grain size of 0 to 4 mm.
• Such granules have particular advantages in handling. This can be filled into corresponding filling openings of sheet metal cassettes. Insulating cassettes can be filled with the highest possible packing density.
• the Dämmstoff spallung comprise at least one airgel molded body.
• a shaped body could be adapted to the shape of the preferably dimensionally stable sheet metal housing.
• the sheet metal housing of the insulating cassettes can for example consist of austenitic steel.
• the airgel is not translucent.
• a suitably treated airgel can be used. This has the advantage that the infrared reflectivity of the sealing material used is increased, whereby the insulating effect is improved.
• the insulating material filling may comprise graphite and / or metal oxide dust.
• the dust can be present for example with an airgel granules in homogeneous mixture.
• the insulating cassette according to the invention has an approximately C-shaped cross-section and is provided with fastening means with which mutually complementary trained insulating cassettes are assembled to form a substantially closed tube shell.
• the insulating cassette can be adapted to any desired contour of a media-carrying device to be insulated.
• Figure 1 is a schematic view of a pipeline lined with insulating cassettes according to the invention
• FIG. 2 shows a plan view along the arrows II-II in FIG. 1,
• FIG. 3 shows a longitudinal section along the arrows III-IM in FIG. 2,
• Figure 4 is an exploded view of an alternative embodiment of the insulating cassette according to the invention.
• Figure 5 shows the insulating cassette of Figure 5 in the assembled state.
• FIG. 1 shows a pipe section 1 of a hot runner leading a pressurized medium.
• the pipe section 1 is lined with insulating cassettes 2 according to the invention, wherein the insulating cassettes 2 each have a C-shaped cross-sectional profile and two mutually complementary insulating cassettes 2 are each assembled with fastening means 3 to form a closed, tubular insulating jacket 4.
• Suitable fastening means include, for example, clip-type buckles known per se.
• Each insulating cassette 2 consists of a riveted or welded sheet metal housing 5, preferably made of austenitic steel sheet. The sheet metal housing is fully closed and closed at the end faces 6 and provided with an insulating material filling 7.
• Insulating cassettes 2 comprise an insulation filling in the form of a granulate of a silicate airgel.
• This is a granulate with an average particle size of 0 to 4 mm, comprising as its main component trimethylsiloxy-modified silica gel.
• This has a porosity of> 90%, a pore diameter of about 20 nm, a bulk density of between 90 and 100 kg / m 3 and a thermal conductivity of about 0.18 W / m K at 25 0 C.
• the specific O The surface area is between 600 and 800 m 2 / g.
• the airgel is non-combustible, non-wettable and buoyant.
• the granules are filled in the insulating cassettes through the openings 8 provided on the front sides thereof.
• the openings 8 are then closed with lids 9.
• the cover 9 can be welded, bolted or riveted.
• Figures 4 and 5 show another embodiment of the insulating cassette 2 according to the invention.
• the Dämmstoff spallung 7 is formed as a shaped body 10, the shape of the shape of the dimensionally stable sheet metal housing 5 is adjusted.
• the molded body 10 is suitably inserted into the sheet metal housing 5, the end face 6 is closed with a correspondingly formed cover 9.
• the airgel is improved by a coloring in its infrared reflectivity, ie in its insulating properties with respect to heat radiation.
• a pulverization of the shaped body 10 with graphite and / or metal oxide dust comes into consideration.
• the granules can be mixed with graphite and / or metal oxide dust, wherein graphite and / or metal oxide dust in a proportion of 1 to 4 ma% of the mixture are involved.
• Insulation filling openings cover

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Thermal Insulation (AREA)
• Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
• Silicon Compounds (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2008
  • 2008-11-12 DE DE102008056987A patent/DE102008056987A1/de not_active Withdrawn
• 2009
  • 2009-10-30 WO PCT/EP2009/007772 patent/WO2010054752A2/de active Application Filing
  • 2009-10-30 US US13/129,000 patent/US20110214770A1/en not_active Abandoned
  • 2009-10-30 CN CN2009801449890A patent/CN102378875A/zh active Pending
  • 2009-10-30 RU RU2011123908/06A patent/RU2509951C9/ru not_active IP Right Cessation
  • 2009-10-30 EP EP09752111A patent/EP2427693A2/de not_active Withdrawn
  • 2009-10-30 CA CA2743410A patent/CA2743410A1/en not_active Abandoned
  • 2009-10-30 JP JP2011535035A patent/JP2012508353A/ja active Pending
  • 2009-10-30 UA UAA201107270A patent/UA105909C2/uk unknown
• 2011
  • 2011-04-19 ZA ZA2011/02944A patent/ZA201102944B/en unknown

Non-Patent Citations (1)

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