US20110214770A1 - Insulating cartridge - Google Patents

Insulating cartridge Download PDF

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Publication number
US20110214770A1
US20110214770A1 US13/129,000 US200913129000A US2011214770A1 US 20110214770 A1 US20110214770 A1 US 20110214770A1 US 200913129000 A US200913129000 A US 200913129000A US 2011214770 A1 US2011214770 A1 US 2011214770A1
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US
United States
Prior art keywords
insulating
cartridge
material filling
insulating material
aerogel
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
US13/129,000
Inventor
Ulrich Knitt
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.)
RWE Power AG
Original Assignee
RWE Power AG
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 RWE Power AG filed Critical RWE Power AG
Assigned to RWE POWER AKTIENGESELLSCHAFT reassignment RWE POWER AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KNITT, ULRICH
Publication of US20110214770A1 publication Critical patent/US20110214770A1/en
Abandoned legal-status Critical Current

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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 cartridge as part of a jacket of devices of a steam generator which are under media pressure, for example as pipe casing insulation, with an essentially closed sheet metal housing which completely encloses an insulating material filling.
  • Such an insulating cartridge is often used for the thermal insulation of pipe lines at steam generators.
  • the known insulating cartridges are sheet metal cartridges which are in the form of half shells and are filled with mineral wool, glass fiber wool or similar insulating materials. These are described, for example, in DE 29 23 094 A.
  • insulating materials In the cold insulation and thermal insulation of pipe lines, it is customary to provide insulating materials with a jacket which protects the insulating material against climatic conditions and mechanical damage.
  • the jacket of the insulation is frequently carried out by sheeting the insulating material, for example with sheet zinc.
  • closed insulating cartridges which completely enclose the insulating material.
  • the sheet metal housing of the insulating cartridges is intended to afford sufficient protection against mechanical damage to the insulating material.
  • Insulating cartridges of the type described above are provided, for example, for lines with a diameter of up to about 800 mm and an internal pressure of 160 bar at a media temperature of about 300° C. It can easily be imagined that the leakage jet from such a line may introduce relatively high mechanical forces into the insulating cartridge.
  • the object on which the invention is based is to improve in this respect an insulating cartridge of the type initially mentioned.
  • an insulating cartridge as part of a jacket of devices of a steam generator which are under media pressure, for example as pipe casing insulation, with an essentially closed sheet metal housing which completely encloses an insulating material filling, the insulating cartridge being distinguished in that the insulating material filling comprises an aerogel.
  • Aerogel is to be understood generally and in the context of the invention as meaning highly porous solids in which up to 95% of the volume is composed of pores.
  • the insulating material filling provided is an inorganic aerogel which is non-wettable, is floatable and is incombustible.
  • An insulating cartridge in which the insulating material filling comprises a silicate aerogel has proved to be especially advantageous.
  • silicate aerogels may have, for example, a pore diameter of about 20 nm with a porosity of >90%.
  • the density of the material may amount to between 90 and 100 kg/m 3 .
  • Thermal conductivity may amount, for example, to about 0.018 W/m ⁇ K at 25° C.
  • Such material may have an internal surface area of about 600 to 800 m 2 /g. The material is therefore predominently suitable as insulating material for the purposes described above.
  • silicate aerogel material bearing the commercial designation “Nanogel” which is sold by the company CABOT Corporation.
  • the insulating material filling to comprise an aerogel as a granulate, preferably with a mean grain size of 0 to 4 mm.
  • a granulate possesses, in particular, handling benefits. It can be decanted into corresponding filling orifices of sheet metal cartridges.
  • the insulating cartridges can be filled with the highest possible packing density.
  • the insulating material filling may comprise at least one aerogel molding.
  • a molding could be adapted to the configuration of the preferably dimensionally stable sheet metal housing.
  • the sheet metal housing of the insulating cartridges may be composed, for example, of austenitic steel.
  • the aerogel there is provision for the aerogel to be non-translucent. A correspondingly treated aerogel may be used for this purpose. The advantage of this is that the infrared reflectivity of the sealing material used is increased and therefore the insulating action is improved.
  • the insulating material filling may comprise graphite powder and/or metal oxide powder.
  • the powder may, for example, be in a homogeneous mixture with an aerogel granulate.
  • the insulating material filling may comprise aerogel and graphite powder and/or metal oxide powder in a homogeneous mixture, the fraction of graphite powder and/or metal oxide powder being between 1.5 and 4.5 ma %.
  • the insulating cartridge according to the invention has an approximately C-shaped cross section and is provided with fastening means by which insulating cartridges designed complementarily to one another can be assembled to form an essentially closed pipe casing.
  • the insulating cartridge may be adapted to any desired contour of a media-carrying device to be insulated.
  • FIG. 1 shows a diagrammatic view of a pipe line which is clad with insulating cartridges according to the invention
  • FIG. 2 shows a top view along the arrows II-II in FIG. 1 ,
  • FIG. 3 shows a longitudinal section along the arrows III-III in FIG. 2 .
  • FIG. 4 shows an exploded view of an alternative embodiment of the insulating cartridge according to the invention.
  • FIG. 5 shows the insulating cartridge from FIG. 5 in the assembled state.
  • FIG. 1 shows a pipe line portion 1 of a high-temperature pipe line carrying a medium which is under pressure.
  • the pipe line portion 1 is clad with insulating cartridges 2 according to the invention, the insulating cartridges 2 having in each case a C-shaped cross-sectional profile, and two mutually complementary insulating cartridges 2 being assembled in each case with fastening means 3 to form a closed tubular insulating jacket 4 .
  • fastening means are, for example, known shackle-type toggle fastenings.
  • Each insulating cartridge 2 is composed of a riveted or welded sheet metal housing 5 , preferably made from austenitic sheet steel.
  • the sheet metal housing is closed over the entire circumference and on the end faces 6 and is provided with an insulating material filling 7 .
  • these comprise an insulating material filling in the form of a granulate of a silicate aerogel.
  • this is a granulate with a mean grain size of 0 to 4 mm, comprising trimethylsilyloxy-modified silica gel as the main component.
  • 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° C.
  • the specific surface area amounts to between 600 and 800 m 2 /g.
  • the aerogel is incombustible and non-wettable and floatable.
  • the granulate is introduced into the insulating cartridges through orifices 8 provided on the end faces of the latter.
  • the orifices 8 are subsequently closed by means of covers 9 .
  • the covers 9 may be welded, screwed or riveted.
  • FIGS. 4 and 5 show a further exemplary embodiment of the insulating cartridge 2 according to the invention.
  • the insulating material filling 7 is formed as a molding 10 , the configuration of which is adapted to the configuration of the dimensionally stable sheet metal housing 5 .
  • the molding 10 is inserted with a fit into the sheet metal housing 5 , the end face 6 of which is closed by means of a correspondingly formed cover 9 .
  • the areogel either in the form of the granulate or of the molding 10 , is improved in terms of its infrared reflectivity, that is to say its insulating properties with regard to thermal radiation, by means of coloring.
  • dusting of the molding 10 with graphite powder and/or metal oxide powder may be considered.
  • the granulate may be mixed with graphite powder and/or metal oxide powder, the graphite powder and/or metal oxide powder having a fraction of 1 to 4 ma % in the mixture.

Abstract

The invention relates to an insulating cartridge for use as part of a pipe jacket insulation, comprising a substantially closed sheet metal casing (5) which completely encloses an insulating material filling (7). The insulating cartridge (2) according to the invention is characterized in that the insulating material filling (7) comprises a silicate aerogel.

Description

  • The invention relates to an insulating cartridge as part of a jacket of devices of a steam generator which are under media pressure, for example as pipe casing insulation, with an essentially closed sheet metal housing which completely encloses an insulating material filling.
  • Such an insulating cartridge is often used for the thermal insulation of pipe lines at steam generators.
  • The known insulating cartridges are sheet metal cartridges which are in the form of half shells and are filled with mineral wool, glass fiber wool or similar insulating materials. These are described, for example, in DE 29 23 094 A. In the cold insulation and thermal insulation of pipe lines, it is customary to provide insulating materials with a jacket which protects the insulating material against climatic conditions and mechanical damage. The jacket of the insulation is frequently carried out by sheeting the insulating material, for example with sheet zinc. In some applications such as, for example, in coolant circuits of nuclear power stations it has proved appropriate to use closed insulating cartridges which completely enclose the insulating material. In particular, the sheet metal housing of the insulating cartridges is intended to afford sufficient protection against mechanical damage to the insulating material. However, in accidents involving the loss of coolant in nuclear power stations, it may nevertheless happen that the metal cartridge is destroyed and the insulating material contained in it escapes. For example, the situation could arise where the leakage jet from a coolant line causes an insulating cartridge to be broken off and destroyed. Insulating cartridges of the type described above are provided, for example, for lines with a diameter of up to about 800 mm and an internal pressure of 160 bar at a media temperature of about 300° C. It can easily be imagined that the leakage jet from such a line may introduce relatively high mechanical forces into the insulating cartridge.
  • In this case, it could happen in theory that the sheet metal housing of an insulating cartridge breaks and the insulating material is flushed out by the leakage jet of the coolant. The washed-out insulating material could block the intake screens of the pumps provided in the reactor sump, with the result that it becomes difficult to bring the accident under control.
  • It became apparent that there was a fundamental problem in retaining or keeping out fibrous insulating materials by means of screens. Laboratory tests showed that the fiber material, on the one hand, is difficult to retain by means of relatively fine-meshed screens and, on the other hand, generates high pressure losses across the screens during its accretion. This may lead to the failure of the screens.
  • The object on which the invention is based, therefore, is to improve in this respect an insulating cartridge of the type initially mentioned.
  • The object on which the invention is based is achieved by means of an insulating cartridge as part of a jacket of devices of a steam generator which are under media pressure, for example as pipe casing insulation, with an essentially closed sheet metal housing which completely encloses an insulating material filling, the insulating cartridge being distinguished in that the insulating material filling comprises an aerogel. Aerogel is to be understood generally and in the context of the invention as meaning highly porous solids in which up to 95% of the volume is composed of pores. Using this material as filling material for an insulating cartridge has the advantage that, for example, material emerging from the insulating cartridge can be kept out of a water circuit more easily by virtue of its physical properties.
  • Preferably, the insulating material filling provided is an inorganic aerogel which is non-wettable, is floatable and is incombustible. An insulating cartridge in which the insulating material filling comprises a silicate aerogel has proved to be especially advantageous. Such silicate aerogels may have, for example, a pore diameter of about 20 nm with a porosity of >90%. The density of the material may amount to between 90 and 100 kg/m3. Thermal conductivity may amount, for example, to about 0.018 W/m·K at 25° C. Such material may have an internal surface area of about 600 to 800 m2/g. The material is therefore predominently suitable as insulating material for the purposes described above.
  • For example, what may be used as a suitable silicate aerogel is material bearing the commercial designation “Nanogel” which is sold by the company CABOT Corporation.
  • In an expedient variant of the insulating cartridge according to the invention, there is provision for the insulating material filling to comprise an aerogel as a granulate, preferably with a mean grain size of 0 to 4 mm. Such a granulate possesses, in particular, handling benefits. It can be decanted into corresponding filling orifices of sheet metal cartridges. The insulating cartridges can be filled with the highest possible packing density.
  • Alternatively, the insulating material filling may comprise at least one aerogel molding. Such a molding could be adapted to the configuration of the preferably dimensionally stable sheet metal housing. The sheet metal housing of the insulating cartridges may be composed, for example, of austenitic steel. In an especially preferred variant of the insulating cartridge according to the invention, there is provision for the aerogel to be non-translucent. A correspondingly treated aerogel may be used for this purpose. The advantage of this is that the infrared reflectivity of the sealing material used is increased and therefore the insulating action is improved.
  • For this purpose, for example, the insulating material filling may comprise graphite powder and/or metal oxide powder. The powder may, for example, be in a homogeneous mixture with an aerogel granulate. For example, the insulating material filling may comprise aerogel and graphite powder and/or metal oxide powder in a homogeneous mixture, the fraction of graphite powder and/or metal oxide powder being between 1.5 and 4.5 ma %.
  • Expediently the insulating cartridge according to the invention has an approximately C-shaped cross section and is provided with fastening means by which insulating cartridges designed complementarily to one another can be assembled to form an essentially closed pipe casing.
  • Within the scope of the invention, however, the insulating cartridge may be adapted to any desired contour of a media-carrying device to be insulated.
  • The invention is explained below by means of an exemplary embodiment illustrated in the drawings in which:
  • FIG. 1 shows a diagrammatic view of a pipe line which is clad with insulating cartridges according to the invention,
  • FIG. 2 shows a top view along the arrows II-II in FIG. 1,
  • FIG. 3 shows a longitudinal section along the arrows III-III in FIG. 2,
  • FIG. 4 shows an exploded view of an alternative embodiment of the insulating cartridge according to the invention, and
  • FIG. 5 shows the insulating cartridge from FIG. 5 in the assembled state.
    •
  • FIG. 1 shows a pipe line portion 1 of a high-temperature pipe line carrying a medium which is under pressure. The pipe line portion 1 is clad with insulating cartridges 2 according to the invention, the insulating cartridges 2 having in each case a C-shaped cross-sectional profile, and two mutually complementary insulating cartridges 2 being assembled in each case with fastening means 3 to form a closed tubular insulating jacket 4. What may be considered as fastening means are, for example, known shackle-type toggle fastenings. Each insulating cartridge 2 is composed of a riveted or welded sheet metal housing 5, preferably made from austenitic sheet steel. The sheet metal housing is closed over the entire circumference and on the end faces 6 and is provided with an insulating material filling 7. In the variant of the insulating cartridges 2 which is shown in FIGS. 1 to 3, these comprise an insulating material filling in the form of a granulate of a silicate aerogel. Here, this is a granulate with a mean grain size of 0 to 4 mm, comprising trimethylsilyloxy-modified silica gel as the main component. This has a porosity of >90%, a pore diameter of about 20 nm, a bulk density of between 90 and 100 kg/m3 and a thermal conductivity of about 0.18 W/m·K at 25° C. The specific surface area amounts to between 600 and 800 m2/g. The aerogel is incombustible and non-wettable and floatable.
  • The granulate is introduced into the insulating cartridges through orifices 8 provided on the end faces of the latter. The orifices 8 are subsequently closed by means of covers 9. The covers 9 may be welded, screwed or riveted.
  • FIGS. 4 and 5 show a further exemplary embodiment of the insulating cartridge 2 according to the invention. The insulating material filling 7 is formed as a molding 10, the configuration of which is adapted to the configuration of the dimensionally stable sheet metal housing 5.
  • The molding 10 is inserted with a fit into the sheet metal housing 5, the end face 6 of which is closed by means of a correspondingly formed cover 9.
  • The areogel, either in the form of the granulate or of the molding 10, is improved in terms of its infrared reflectivity, that is to say its insulating properties with regard to thermal radiation, by means of coloring. For example, dusting of the molding 10 with graphite powder and/or metal oxide powder may be considered. The granulate may be mixed with graphite powder and/or metal oxide powder, the graphite powder and/or metal oxide powder having a fraction of 1 to 4 ma % in the mixture.
    • LIST OF REFERENCE SYMBOLS
    • 1 Pipe line portion
    • 2 Insulating cartridge
    • 3 Fastening means
    • 4 Insulating jacket
    • 5 Sheet metal housing
    • 6 End faces
    • 7 Insulating material filling
    • 8 Orifices
    • 9 Cover
    • 10 Molding

Claims (10)

1. An insulating cartridge as part of a jacket of devices of a steam generator which are under media pressure, for example as pipe casing insulation, with an essentially closed sheet metal housing which completely encloses an insulating material filling, characterized in that the insulating material filling comprises an aerogel.
2. The insulating cartridge as claimed in claim 1, characterized in that the insulating material filling comprises an inorganic areogel.
3. The insulating cartridge as claimed in claim 1, characterized in that the insulating material filling comprises a silicate aerogel.
4. The insulating cartridge as claimed in claim 1, characterized in that the insulating material filling comprises an aerogel as a granulate, preferably with a mean grain size of 0 to 4 mm.
5. The insulating cartridge as claimed in claim 1, characterized in that the insulating material filling comprises at least one aerogel molding.
6. The insulating cartridge as claimed in claim 5, characterized in that the molding is adapted to the configuration of the preferably dimensionally stable sheet metal housing.
7. The insulating cartridge as claimed in claim 1, characterized in that the aerogel has increased infrared reflectivity.
8. The insulating cartridge as claimed in claim 7, characterized in that the insulating material filling comprises graphite powder and/or metal oxide powder.
9. The insulating cartridge as claimed in claim 7, characterized in that the insulating material filling comprises aerogel and graphite power and/or metal oxide powder in a homogeneous mixture, the fraction of graphite powder and/or metal oxide powder being between 1.5 and 4.5 ma %.
10. The insulating cartridge as claimed in claim 1, characterized in that it has an approximately C-shaped cross section and is provided with fastening means by which insulating cartridges designed complementarily to one another can be assembled to form an essentially closed pipe casing.
US13/129,000 2008-11-12 2009-10-30 Insulating cartridge Abandoned US20110214770A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008056987A DE102008056987A1 (en) 2008-11-12 2008-11-12 insulating cartridge
DE102008056987.9 2008-11-12
PCT/EP2009/007772 WO2010054752A2 (en) 2008-11-12 2009-10-30 Insulating cartridge

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US20110214770A1 true US20110214770A1 (en) 2011-09-08

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US13/129,000 Abandoned US20110214770A1 (en) 2008-11-12 2009-10-30 Insulating cartridge

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US (1) US20110214770A1 (en)
EP (1) EP2427693A2 (en)
JP (1) JP2012508353A (en)
CN (1) CN102378875A (en)
CA (1) CA2743410A1 (en)
DE (1) DE102008056987A1 (en)
RU (1) RU2509951C9 (en)
UA (1) UA105909C2 (en)
WO (1) WO2010054752A2 (en)
ZA (1) ZA201102944B (en)

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WO2014008058A1 (en) * 2012-07-06 2014-01-09 Waters Technologies Corporation Techniques for thermally insulating a liquid chromatographic column
US20140090736A1 (en) * 2012-09-28 2014-04-03 Bp Corporation North America Inc. Burn protection systems and standoffs for piping
US11185795B2 (en) 2012-07-06 2021-11-30 Waters Technologies Corporation Techniques for thermally insulating a chromatographic column

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CN104075076A (en) * 2014-06-10 2014-10-01 北京豪特耐管道设备有限公司 Repair process of heat distribution pipeline
DE202014006236U1 (en) * 2014-07-31 2015-11-06 Christof Schulte-Göbel Insulation for hot gas contacting parts of a thin surface coating device, in particular for tubular or tubular guides for hot gas
CN104329541B (en) * 2014-10-29 2016-04-13 浙江创想节能科技有限公司 A kind of removable insulation cover of metal double-walled and making method
CN107178682A (en) * 2017-07-19 2017-09-19 赵俊芳 Adiabatic composite construction of a kind of antiradiation and preparation method thereof
RU192163U1 (en) * 2018-06-19 2019-09-05 Алексей Евгеньевич Кузнецов HEAT-INSULATING SHELL WITH THE INTERNAL AEROGEL INSERT
RU190561U1 (en) * 2018-12-20 2019-07-03 Алексей Евгеньевич Кузнецов HEAT-INSULATING SHELL WITH INNER AIR-GEL-INSERT SHIFT DISPLAYED WITH REGARD TO SHELL
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GB2517373A (en) * 2012-07-06 2015-02-18 Waters Technologies Corp Techniques for thermally insulating a liquid chromatographic column
US10413846B2 (en) 2012-07-06 2019-09-17 Waters Technologies Corporation Techniques for thermally insulating a liquid chromatographic column
GB2517373B (en) * 2012-07-06 2021-02-17 Waters Technologies Corp Techniques for thermally insulating a liquid chromatographic column
US11185795B2 (en) 2012-07-06 2021-11-30 Waters Technologies Corporation Techniques for thermally insulating a chromatographic column
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RU2509951C2 (en) 2014-03-20
EP2427693A2 (en) 2012-03-14
CN102378875A (en) 2012-03-14
WO2010054752A3 (en) 2012-01-26
CA2743410A1 (en) 2010-05-20
WO2010054752A2 (en) 2010-05-20
UA105909C2 (en) 2014-07-10
JP2012508353A (en) 2012-04-05
DE102008056987A1 (en) 2010-05-20
ZA201102944B (en) 2012-07-25
RU2509951C9 (en) 2014-09-20
RU2011123908A (en) 2012-12-20

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