EP2352962A2 - Gasdurchlässige begrenzungswand - Google Patents
Gasdurchlässige begrenzungswandInfo
- Publication number
- EP2352962A2 EP2352962A2 EP09759736A EP09759736A EP2352962A2 EP 2352962 A2 EP2352962 A2 EP 2352962A2 EP 09759736 A EP09759736 A EP 09759736A EP 09759736 A EP09759736 A EP 09759736A EP 2352962 A2 EP2352962 A2 EP 2352962A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- channels
- boundary wall
- air
- particle
- mass flow
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
- F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
- F28C3/14—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material moving by gravity, e.g. down a tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
Definitions
- the invention relates to a gas-permeable boundary wall for confining a particle flow, in particular for an air-sand heat exchanger.
- DE 102 08 487 A1 describes a device for utilizing the heat of highly heated hot air.
- the hot air which was heated by a radiation receiver to more than 1000 0 C, transfers its heat to a stream of sand.
- the hot air flow is supplied to the air-sand heat exchanger from below, while the sand trickles down in the heat exchanger from top to bottom.
- DE 10 2004 019 801 A1 describes a gas-sand heat exchanger with a shaft which has a sand inlet and a sand outlet with one in between has a stretch of sand.
- the shaft walls and the sand track are traversed by hot air.
- the efficiency depends significantly on the performance of the blower transporting the air flow.
- the blower power is proportional to the flow resistance, which is determined by the pressure loss in the flowed through sand layer and the porous partitions.
- the invention has for its object to provide a gas-permeable boundary wall with reduced flow resistance.
- the gas-permeable boundary wall according to the invention is defined by the patent claim 1. It consists of a one-piece grid body of straight channels, which are circumferentially bounded by channel walls.
- the channels create large cavities in the porous structure of the boundary wall and thus reduce the flow resistance.
- the channel walls form a grid structure to ensure the required strength of the boundary wall. By reducing the wall thickness to a size acceptable for pressure loss while maintaining the required strength, a boundary wall is created which has the mechanical properties required for the limiting function but provides low air resistance.
- the invention is applicable to gas turbine and combined cycle power plants in the storage of Hochtermperaturabiano, in the steel industry for preheating the air in the combustion chambers of high-temperature furnaces, in the regenerator industry for temporary storage of waste heat and use for preheating combustion air and solar thermal power plants in the Dissipation of heat from a radiation absorber, as described in DE 102 08 487 Al.
- the general idea of the invention is not to make the porous boundary wall solid, but to penetrate it with channels.
- the channel walls then form a stabilizing web structure.
- the channels are arranged parallel to the particle side and transversely to the flow direction of the air mass flow.
- Another variant provides that the channels run parallel to the direction of the particle mass flow.
- the particle side of the boundary wall can be formed as a closed porous wall.
- At least some channels may have open channel ends on the particle side. The penetration of particles into the channels is prevented by the air flow.
- the channels extend at least approximately in the direction of the air mass flow and at least some channels are closed on the particle side.
- the channels may be arranged in the manner of a checkerboard pattern, with each second channel being closed on the air side and open on the particle side, the channels lying therebetween being open on the air side and being closed on the particle side.
- the boundary wall preferably consists of a porous ceramic, in particular of SiC ceramic, such as ReSiC or SiSiC. It is also possible to harden the channel walls at their ends on the particle side, for example by Si infiltration.
- the material of the porous walls should be resistant to high temperatures and withstand an application temperature of> 900 °.
- Fig. 1 is a perspective view of a boundary wall, in which the
- Fig. 2 shows a variant in which the channels transverse to the direction of
- FIG. 3 shows a similar embodiment as Figure 2, but with the
- Fig. 4 shows an embodiment in which the channels are mutually closed at opposite ends.
- FIG. 1 shows a boundary wall 10, one side of which is referred to as air side 11 and the opposite side as particle side 12.
- a particle mass flow 13 moves, which runs here from top to bottom.
- the particle mass flow 13 consists of sand, in particular quartz sand or other bulk materials, which fall down or slide down due to gravity.
- the air side 11 defines a space in which hot air is contained under pressure, so that an air mass flow 14 is formed, which passes through the porous boundary wall 10. Beyond the boundary wall of the hot air flow to the particle mass flow 13, so that a heat transfer from the hot air takes place on the particle mass flow.
- the device forms an air-sand heat exchanger.
- the boundary wall is formed as a hollow block body. It contains parallel channels 15, which run through the inside of the boundary wall.
- the channels 15 are rectilinear. They are limited by channel walls 16.
- the channel walls 16 on the one hand form partitions between the channels and on the other hand also the channel boundaries to the air side 11 and to the particle side 12.
- the particle mass flow 13 limiting boundary wall 17 is a closed wall.
- the channels 15 extend parallel to the particle side 12 and transversely to the direction of the air mass flow 14.
- the boundary wall 18 exposed to the air mass flow 14 is likewise a closed wall.
- the entire boundary wall 10 consists of a one-piece profile body.
- the air mass flow 14 penetrates the boundary walls 18 and 17. Due to the hollow channels 15, the air resistance, the boundary wall 10 offers between the air side and the particle side, low.
- the area of the channel walls 16 is at most 20% of the area of a channel 15.
- the boundary wall 10 consists of two rows of channels 15. Also, fewer or more rows of channels are possible. In the lower limit, the boundary wall consists of only one row of parallel channels.
- the channels are rectangular, so that the channel walls 16 have the same wall thickness everywhere. It is also possible to make the channels polygonal with more than four corners or as round channels.
- the channel walls consist z. B. of recrystallized silicon carbide having a porosity of up to 45% or of a porous metal or other porous ceramic.
- the channels 15 extend transversely to the direction of the particle mass flow 13 and in the direction of the air mass flow 14.
- the channels 15 are open on the air side 11 and on the particle side 12.
- the Hot air is thus passed through the open channels 15 with virtually no air resistance.
- the leakage of sand is prevented by the supplied air mass flow 14.
- the air resistance is determined only by friction on the channel walls, the channel inlet and the channel outlet.
- z. B. Si infiltration on the particle side 12 of the channel structure, the durability of the boundary wall is significantly increased.
- the abrasion of a boundary wall can be compensated by a tracking mechanism.
- Figure 3 shows a similar embodiment as Figure 2, wherein the channels are not horizontal, but drop off to the particle side 12 out.
- each second channel 15 on the air side 18 has a closed end wall 20, while the intermediate channels 15 have an opening 21 there.
- End walls 20a and openings 21 have the intermediate channels on the particle side 17.
- Each of the channels is thus closed at one end and open at the other end.
- the sealed ends on the particle side 17 may be cured by post-desilication to increase the abrasion resistance.
- a wall abrasion can be compensated for by means of a tracking mechanism, by means of which the entire boundary wall is displaced in the direction of the particle side 17. All channels run in the direction of air flow.
- On the back of the boundary wall the channels are closed contrary to the front.
- the arrangement of the channels on each side of the boundary wall corresponds to the white and black fields of a chessboard.
- the air mass flow 14 penetrates the longitudinal channel wall 22 and enters an adjacent channel of the other channel group. Due to the enlarged wall surface defined over the circumference and length of a channel, the local gas velocity is much smaller than when a massive porous wall
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200810058893 DE102008058893B3 (de) | 2008-11-26 | 2008-11-26 | Gasdurchlässige Begrenzungswand |
| PCT/EP2009/065846 WO2010060933A2 (de) | 2008-11-26 | 2009-11-25 | Gasdurchlässige begrenzungswand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2352962A2 true EP2352962A2 (de) | 2011-08-10 |
| EP2352962B1 EP2352962B1 (de) | 2016-04-27 |
Family
ID=41606418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09759736.3A Not-in-force EP2352962B1 (de) | 2008-11-26 | 2009-11-25 | Luft-sand-wärmeübertrager |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2352962B1 (de) |
| DE (1) | DE102008058893B3 (de) |
| WO (1) | WO2010060933A2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4105479B1 (de) | 2021-06-15 | 2025-05-14 | John Cockerill Renewables S.A. | Partikelwärmetauscher für ein solarturmkraftwerk |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530274A (en) * | 1946-12-09 | 1950-11-14 | Phillips Petroleum Co | Pebble heater system and method of operation |
| US2534625A (en) * | 1948-05-10 | 1950-12-19 | Phillips Petroleum Co | Pebble heating chamber |
| US2552063A (en) * | 1948-12-17 | 1951-05-08 | Phillips Petroleum Co | Large scale pebble heating chamber |
| US2635990A (en) * | 1949-05-02 | 1953-04-21 | Phillips Petroleum Co | Pebble heat-exchanger |
| DE830988C (de) * | 1949-07-13 | 1952-02-11 | Hermann Repky Dr Ing | Anwendung eines Verfahrens zur Erwaermung von Gasen |
| FR1515158A (fr) * | 1967-01-17 | 1968-03-01 | Sfec | Perfectionnements aux supports des catalyseurs |
| GB2024405A (en) * | 1978-06-23 | 1980-01-09 | Techne Cambridge Ltd | Fluidization apparatus |
| US4426762A (en) * | 1979-08-28 | 1984-01-24 | Commissariat A L'energie Atomique | Method for selectively obturating at least one end of a structural module |
| US4276071A (en) * | 1979-12-03 | 1981-06-30 | General Motors Corporation | Ceramic filters for diesel exhaust particulates |
| JPS56133598A (en) * | 1980-03-24 | 1981-10-19 | Ngk Insulators Ltd | Heat transfer type ceramic heat exchanger and its manufacture |
| EP1325898A4 (de) * | 2000-09-26 | 2005-07-27 | Ngk Insulators Ltd | Aluminiumoxid-wabenstruktur, verfahren zu ihrer herstellung und wärmespeichernde wabenstruktur und deren verwendung |
| US6551734B1 (en) * | 2000-10-27 | 2003-04-22 | Delphi Technologies, Inc. | Solid oxide fuel cell having a monolithic heat exchanger and method for managing thermal energy flow of the fuel cell |
| DE10208487B4 (de) * | 2002-02-27 | 2004-02-12 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Verfahren zur Nutzung der Wärme hocherhitzter Heißluft |
| WO2004024295A1 (ja) * | 2002-09-13 | 2004-03-25 | Ibiden Co., Ltd. | ハニカム構造体 |
| DE102004019801B4 (de) * | 2004-04-23 | 2011-01-13 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Gas-Sand-Wärmetauscher |
-
2008
- 2008-11-26 DE DE200810058893 patent/DE102008058893B3/de not_active Expired - Fee Related
-
2009
- 2009-11-25 EP EP09759736.3A patent/EP2352962B1/de not_active Not-in-force
- 2009-11-25 WO PCT/EP2009/065846 patent/WO2010060933A2/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010060933A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2352962B1 (de) | 2016-04-27 |
| WO2010060933A3 (de) | 2010-11-25 |
| WO2010060933A2 (de) | 2010-06-03 |
| DE102008058893B3 (de) | 2010-03-04 |
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