EP0757219A2 - Pack of heat exchanger plates for regenerative heat exchanger - Google Patents

Pack of heat exchanger plates for regenerative heat exchanger Download PDF

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Publication number
EP0757219A2
EP0757219A2 EP96111403A EP96111403A EP0757219A2 EP 0757219 A2 EP0757219 A2 EP 0757219A2 EP 96111403 A EP96111403 A EP 96111403A EP 96111403 A EP96111403 A EP 96111403A EP 0757219 A2 EP0757219 A2 EP 0757219A2
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EP
European Patent Office
Prior art keywords
profile
heating plate
sheets
heating
plate package
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Granted
Application number
EP96111403A
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German (de)
French (fr)
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EP0757219A3 (en
EP0757219B1 (en
Inventor
Gerd Köster
Winfried Moll
Siegfried Schlüter
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Hamon Rothemuehle Cottrell GmbH
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Apparatebau Rothemuehle Brandt and Kritzler GmbH
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Publication of EP0757219A3 publication Critical patent/EP0757219A3/en
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Publication of EP0757219B1 publication Critical patent/EP0757219B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets

Definitions

  • the invention relates to a heating plate package for tangential or radial installation in trapezoidal segmented cells having heating surface supports of regenerative heat exchangers with fixed or revolving storage masses, which consists of a plurality of stacked profile sheets which are held together and leave flow channels between them.
  • the regenerative heat exchanger can be used for both air preheating (Luvos) and gas preheating (Gavos).
  • Air preheaters are used in power plant and industrial combustion systems to preheat the combustion air and gas preheaters in exhaust gas purification, for example in catalytic reactors, for preheating or in gas scrubbing for reheating.
  • the heat exchange between the outflowing hot gas and the air supplied in countercurrent is achieved either by a rotating heating surface support or - in the case of a fixed heating surface support - by means of hoods arranged on both sides of the storage masses and rotating continuously around a common axis.
  • the heating surfaces or storage masses of such regenerative heat exchangers consist of two differently profiled, e.g. 0.5 to 1.3 mm thick, optionally coated or enamelled steel sheets, which are bundled into packages according to the cell-like structure of the circular heating surface carrier and fit into the individual cells of the heating surface support can be used.
  • the heating plates are packaged by solid boxes or frame brackets, which are placed around the heating plates bundled into the package. In the case of the heater plates, which are mostly arranged tangentially due to the more stable package position, it is customary to hold the heater plate packages together at their head ends, which are parallel to the trapezoidal shape, by means of head plates which are connected to one another on the top and bottom by horizontally extending bars.
  • the heating plate packs are arranged in the gas flow direction, that is to say generally in a vertical direction.
  • the massive brackets With this construction of the heating plate packs, which has been known for a long time, the massive brackets not only increase the package weight, but also take up a considerable part of the available installation space, and this applies equally to tangentially or radially arranged sheet metal layers of the heating plate pack. Along with this, the free flow cross-section for the air or gas throughput is inevitably restricted.
  • the invention is therefore based on the object of simplifying a heating plate package of the type mentioned, in particular to provide a weight-saving package holder and improved flow.
  • the outer profile plate pairs which form quasi box girder provide for Sufficiently large stability, which is further supported by the fact that vertical outer spars of the profiled sheets are connected to horizontal spars on the top and bottom of the package, so that there is a belt-like spar wrap around the heating surface package.
  • the sandwich-like hollow box girder assembly of at least the two outer profiled sheets of the heating sheet bundle not only saves weight, but above all makes better use of the installation volume in the heating sheet support and thus increases the active heating area.
  • the profile sheets of the profile sheet pair (s) are fully capable of being used like all other heating sheets in the package as heating surfaces with the corresponding free cross sections in the entire area of the individual cells; the heating plate package thus offers higher heat outputs.
  • the blockage in the flow cross-sections of the individual cells is reduced, so that lower flow losses for the heat-exchanging media and a lower pressure drop can be achieved.
  • the flow cross-sections which are not restricted in the case of the hollow box girder sandwich composite, allow the heating plate stack to be moved on all sides, i.e. to be fully enclosed with pairs of profiled sheets and thus to promote even greater stability.
  • One embodiment of the invention provides that one profile sheet of the pair of profile sheets undulates and the other profile sheet is corrugated.
  • a pair of profiled sheets is therefore always composed of a stronger and a less corrugated profiled sheet, and if there are several pairs of profiled sheets on the corresponding package sides, the two types of profiled sheet are arranged alternately one on top of the other.
  • a preferred embodiment of the invention provides that the profiled sheets are connected to one another by welding spots.
  • the two Sheets of a pair of profiled sheets or several pairs of profiled sheets can be connected to one another by the spot welding process in an automatic manufacturing process to form the dimensionally stable hollow box girder composite body and thus to form the package-enclosing brackets, at the points where the sheets touch each other at points.
  • the profiling of the undulated plate runs obliquely to that of the corrected plate.
  • Spot welding can take place as soon as the two profiled sheets, which can be produced, for example, by the method known from DE 41 22 949 A, lie one on top of the other.
  • two or more profile sheets can alternatively be connected to one another by means of screws or rivets, for example.
  • the end faces of the horizontal bars lie at the same height as the end faces of the radial walls of the cells of the heating surface support.
  • the large dimensional stability of the heating plate package achieved by the sandwich box sandwich composite creates the prerequisites for the level arrangement of the horizontal bars of the heating plate packages with the cell walls on the upper and lower end of the heating surface support. This results in an additional radial sealing contour and correspondingly less media leakage, depending on the number - usually two - of the parallel horizontal bars.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air Supply (AREA)
  • Basic Packing Technique (AREA)
  • Power Steering Mechanism (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Liquid Developers In Electrophotography (AREA)

Abstract

The hot plate packet comprises a number of adjacent profile plates held together but leaving flow channels between them. On at least two opposing packet sides (18, 19) the two outer profile plates (14, 15) are formed as sandwich-type shape-stable profile plate pairs. One profile plate of the pair is undulated and the other is corrugated. The profile plates are joined to one another by welding points (16). The vertical outer rail (20) of the profile plates are connected to horizontal rails (21) on the packet upper and lower sides. The face surfaces of the horizontal rails are located at the same height as the face surfaces of the radial walls of the cells of the hot surface carrier (4).

Description

Die Erfindung betrifft ein Heizblechpaket zum tangentialen bzw. radialen Einbau in trapezartig segmentierte Zellen aufweisende Heizflächenträger von Regenerativ-Wärmetauschern mit feststehenden oder umlaufenden Speichermassen, das aus einer Vielzahl aufeinanderliegender, zusammengehaltener, zwischen sich Strömungskanäle freilassender Profilbleche besteht.The invention relates to a heating plate package for tangential or radial installation in trapezoidal segmented cells having heating surface supports of regenerative heat exchangers with fixed or revolving storage masses, which consists of a plurality of stacked profile sheets which are held together and leave flow channels between them.

Der Regenerativ-Wärmetauscher läßt sich hierbei sowohl für die Luftvorwärmung (Luvos) als auch für die Gasvorwärmung (Gavos) einsetzen. Als Luftvorwärmer wird bei Kraftwerks- und Industriefeuerungsanlagen zur Vorwärmung der Verbrennungsluft und als Gasvorwärmer in der Abgasreinigung, bspw. bei katalytisch arbeitenden Reaktoren, zur Vorwärmung oder bei einer Gaswäsche zur Wiederaufwärmung genutzt. Der Wärmetausch zwischen dem abströmenden heißen Gas und der dazu im Gegenstrom zugeführten Luft wird entweder durch einen rotierenden Heizflächenträger oder - bei feststehendem Heizflächenträger - durch beidseitig der Speichermassen angeordnete, sich um eine gemeinsame Achse kontinuierlich drehende Hauben erreicht.The regenerative heat exchanger can be used for both air preheating (Luvos) and gas preheating (Gavos). Air preheaters are used in power plant and industrial combustion systems to preheat the combustion air and gas preheaters in exhaust gas purification, for example in catalytic reactors, for preheating or in gas scrubbing for reheating. The heat exchange between the outflowing hot gas and the air supplied in countercurrent is achieved either by a rotating heating surface support or - in the case of a fixed heating surface support - by means of hoods arranged on both sides of the storage masses and rotating continuously around a common axis.

Die Heizflächen bzw. Speichermassen solcher Regenerativ-Wärmetauscher bestehen aus zwei unterschiedlich profilierten, bspw. 0,5 bis 1,3 mm dicken, gegebenenfalls beschichteten oder emaillierten Stahlblechen, die entsprechend dem zellenartigen Aufbau des kreisrunden Heizflächenträgers zu Paketen gebündelt und passend in die einzelnen Zellen des Heizflächenträgers eingesetzt werden. Die Heizbleche werden durch massive Kästen oder Rahmenhalterungen paketiert, die um die zu dem Paket gebündelten Heizbleche gelegt werden. Bei den wegen der stabileren Paketlage zumeist tangential angeordneten Heizblechen ist es üblich, die Heizblechpakete an ihren bezogen auf die Trapezform parallelen Kopfenden mittels Kopfplatten zusammenzuhalten, die an der Ober- bzw. Unterseite jeweils über horizontal verlaufende Holme miteinander verbunden sind. Die Heizblechpakete werden der Gasströmungsrichtung folgend, d.h. in der Regel vertikal angeordnet. Bei dieser seit langem bekannten Bauweise der Heizblechpakete erhöhen die massiven Halterungen nicht nur das Paketgewicht, sondern sie nehmen außerdem von dem zur Verfügung stehenden Einbauraum einen erheblichen Teil in Anspruch, und das gilt gleichermaßen für tangential oder radial angeordnete Blechlagen des Heizblechpaketes. Einhergehend damit wird unvermeidlich der freie Strömungsquerschnitt für den Luft- bzw. Gasdurchsatz eingeschränkt.The heating surfaces or storage masses of such regenerative heat exchangers consist of two differently profiled, e.g. 0.5 to 1.3 mm thick, optionally coated or enamelled steel sheets, which are bundled into packages according to the cell-like structure of the circular heating surface carrier and fit into the individual cells of the heating surface support can be used. The heating plates are packaged by solid boxes or frame brackets, which are placed around the heating plates bundled into the package. In the case of the heater plates, which are mostly arranged tangentially due to the more stable package position, it is customary to hold the heater plate packages together at their head ends, which are parallel to the trapezoidal shape, by means of head plates which are connected to one another on the top and bottom by horizontally extending bars. The heating plate packs are arranged in the gas flow direction, that is to say generally in a vertical direction. With this construction of the heating plate packs, which has been known for a long time, the massive brackets not only increase the package weight, but also take up a considerable part of the available installation space, and this applies equally to tangentially or radially arranged sheet metal layers of the heating plate pack. Along with this, the free flow cross-section for the air or gas throughput is inevitably restricted.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Heizblechpaket der eingangs genannten Art zu vereinfachen, insbesondere mit einer gewichtssparenden Pakethalterung und verbesserter Durchströmung zu schaffen.The invention is therefore based on the object of simplifying a heating plate package of the type mentioned, in particular to provide a weight-saving package holder and improved flow.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß an zumindest zwei einander gegenüberliegenden Paketseiten mindestens die beiden äußeren Profilbleche als sandwichartig, formstabil miteinander verbundenes Profilblechpaar ausgebildet sind. Bei einem Einbau eines tangential ausgerichtete Profilbleche aufweisenden Heizblechpaketes sind das die beiden zueinander parallelen Kopfseiten und beim Einbau mit in bezug auf den Heizflächenträger radial ausgerichteten Profilblechen sind folglich die entsprechend der Trapez form der Heizflächenträgerzellen zueinander divergierend verlaufenden Paketlängsseiten mit einem erfindungsgemäßen Profilblechepaar ausgebildet. Für die Heizblechpakete bedarf es somit keiner schweren Kopfplatten oder gar eines kompletten Umfangsgehäuses mehr, sondern die quasi Hohlkastenträger bildenden äußeren Profilblechepaare sorgen für eine ausreichend große Stabilität, die dadurch noch unterstützt wird, daß vertikale Außenholme der Profilbleche mit paketober- und paketunterseitigen Horizontalholmen verbunden sind, so daß sich eine gurtartige Holm-Umschlingung des Heizflächenpaketes ergibt.This object is achieved according to the invention in that on at least two opposite sides of the package at least the two outer profiled sheets are constructed as a pair of profiled sheets which are connected to one another in a sandwich-like manner and in a dimensionally stable manner. When installing a tangentially aligned heating plate stack, these are the two mutually parallel head sides and when installing with radially aligned with respect to the heating surface support profile sheets are consequently formed according to the trapezoidal shape of the heating surface support cells diverging package sides with a profile sheet pair according to the invention. For the heating plate packages, there is no longer any need for heavy head plates or even a complete circumferential housing, but the outer profile plate pairs which form quasi box girder provide for Sufficiently large stability, which is further supported by the fact that vertical outer spars of the profiled sheets are connected to horizontal spars on the top and bottom of the package, so that there is a belt-like spar wrap around the heating surface package.

Durch den sandwichartigen Hohlkastenträgerverbund mindestens der beiden äußeren Profilbleche des Heizblechpaketes wird neben einer Gewichtseinsparung vor allem eine bessere Ausnutzung des Einbauvolumens im Heizflächenträger und damit eine Vergrößerung der aktiven Heizfläche erreicht. Denn im Gegensatz zu den herkömmlichen Kopfplattenanordnungen oder Umfangsrahmen sind die Profilbleche des bzw. der Profilblechepaare uneingeschränkt in der Lage, wie alle übrigen Heizbleche des Paketes als Heizflächen mit den entsprechenden freien Querschnitten im gesamten Bereich der einzelnen Zellen genutzt zu werden können; das Heizblechpaket bietet somit höhere Wärmeleistungen. Gleichzeitig verringert sich die Versperrung in den Strömungsquerschnitten der einzelnen Zellen, so daß sich geringere Strömungsverluste für die wärmeaustauschenden Medien und ein niedrigerer Druckabfall erreichen lassen. Die bei dem Hohlkastenträger-Sandwichverbund nicht eingeschränkten Strömungsquerschnitte erlauben es, das Heizblechpaket gegebenenfalls allseitig, d.h. umfangsgeschlossen mit Profilblechepaaren auszubilden und damit eine noch höhere Stabilität zu begünstigen.The sandwich-like hollow box girder assembly of at least the two outer profiled sheets of the heating sheet bundle not only saves weight, but above all makes better use of the installation volume in the heating sheet support and thus increases the active heating area. In contrast to the conventional head plate arrangements or circumferential frames, the profile sheets of the profile sheet pair (s) are fully capable of being used like all other heating sheets in the package as heating surfaces with the corresponding free cross sections in the entire area of the individual cells; the heating plate package thus offers higher heat outputs. At the same time, the blockage in the flow cross-sections of the individual cells is reduced, so that lower flow losses for the heat-exchanging media and a lower pressure drop can be achieved. The flow cross-sections, which are not restricted in the case of the hollow box girder sandwich composite, allow the heating plate stack to be moved on all sides, i.e. to be fully enclosed with pairs of profiled sheets and thus to promote even greater stability.

Eine Ausgestaltung der Erfindung sieht vor, daß das eine Profilblech des Profilblechepaares onduliert und das andere Profilblech korrugiert ist. Ein Profilblechpaar setzt sich somit stets aus einem stärker und einem weniger gewellten Profilblech zusammen, und bei mehreren Profilblechpaaren an den entsprechenden Paketseiten sind die beiden Profilblecharten regelmäßig wechselnd aufeinanderliegend angeordnet.One embodiment of the invention provides that one profile sheet of the pair of profile sheets undulates and the other profile sheet is corrugated. A pair of profiled sheets is therefore always composed of a stronger and a less corrugated profiled sheet, and if there are several pairs of profiled sheets on the corresponding package sides, the two types of profiled sheet are arranged alternately one on top of the other.

Eine bevorzugte Ausführung der Erfindung sieht vor, daß die Profilbleche durch Schweißpunkte miteinander verbunden sind. Die beiden Bleche eines Profliblechepaares oder mehrere Profilblechepaare lassen sich nach dem Punktschweißverfahren in einem automatischen Fertigungsprozeß zu dem formstabilen Hohlkastenträger-Verbundkörper und damit zu den paketumschließenden Halterungen miteinander verbinden, und zwar an den Stellen, an denen sich die Bleche punktweise berühren. Aus wärme- und strömungstechnischen Gründen verläuft nämlich die Profilierung des ondulierten Bleches schräg zu der des korrigierten Bleches. Das Punktschweißen kann geschehen, sobald die beiden Profilbleche, die sich bspw. nach dem durch die DE 41 22 949 A bekanntgewordenen Verfahren herstellen lassen, aufeinanderliegen. Statt durch Punktschweißen lassen sich zwei oder mehrere Profilbleche alternativ durch bspw. Schrauben oder Nieten miteinander verbinden.A preferred embodiment of the invention provides that the profiled sheets are connected to one another by welding spots. The two Sheets of a pair of profiled sheets or several pairs of profiled sheets can be connected to one another by the spot welding process in an automatic manufacturing process to form the dimensionally stable hollow box girder composite body and thus to form the package-enclosing brackets, at the points where the sheets touch each other at points. For thermal and fluidic reasons, the profiling of the undulated plate runs obliquely to that of the corrected plate. Spot welding can take place as soon as the two profiled sheets, which can be produced, for example, by the method known from DE 41 22 949 A, lie one on top of the other. Instead of spot welding, two or more profile sheets can alternatively be connected to one another by means of screws or rivets, for example.

Gemäß einer bevorzugten Ausführung der Erfindung liegen die Stirnflächen der Horizontalholme auf der gleichen Höhe wie die Stirnflächen der Radialwände der Zellen des Heizflächenträgers. Die durch den Hohlkastenträger-Sandwichverbund erreichte große Formstabilität des Heizblechpaketes schafft die Voraussetzung für die niveaugleiche Anordnung der Horizontalholme der Heizblechpakete mit den Zellenwänden an der oberen und unteren Stirnseite des Heizflächenträgers. Damit ergibt sich entsprechend der Zahl - meist zwei - der parallel verlaufenden Horizontalholme eine zusätzliche radiale Abdichtkontur und dementsprechend eine geringere Medienleckage. Denn es dichtet nicht mehr nur eine einzelne Zellenwand des Heizflächenträgers gegen die jeweiligen Radial-Dichtplatten ab, sondern weiterhin auch die parallel zu den Radialwänden der Zellen liegenden Halterungsflacheisen der Horizontalholme der Heizblechpakete, die fluchtend mit der Ober- und Unterkante des Heizflächenträgers abschließen. Die Horizontalholme erhöhen somit die Anzahl der Dichtlinien pro Radialdichtung und Zelle des Heizflächenträgers, wodurch sich der im Bereich dieser Dichtungen aufgrund des Druckgefälles übertretende Volumenstrom reduziert, was zu einer Leckageminderung beiträgt.According to a preferred embodiment of the invention, the end faces of the horizontal bars lie at the same height as the end faces of the radial walls of the cells of the heating surface support. The large dimensional stability of the heating plate package achieved by the sandwich box sandwich composite creates the prerequisites for the level arrangement of the horizontal bars of the heating plate packages with the cell walls on the upper and lower end of the heating surface support. This results in an additional radial sealing contour and correspondingly less media leakage, depending on the number - usually two - of the parallel horizontal bars. This is because it no longer only seals a single cell wall of the heating surface support against the respective radial sealing plates, but also the mounting flat irons of the horizontal bars of the heating plate bundles that are parallel to the radial walls of the cells and that align flush with the top and bottom edge of the heating surface support. The horizontal bars thus increase the number of sealing lines per radial seal and cell of the heating surface support, as a result of which the volume flow in the area of these seals due to the pressure drop is reduced, which contributes to a reduction in leakage.

Claims (5)

Heizblechpaket, zum tangentialen bzw. radialen Einbau in trapezartig segmentierte Zellen aufweisende Heizflächenträger von Regenerativ-Wärmetauschern mit feststehenden oder umlaufenden Speichermassen, das aus einer Vielzahl aneinanderliegender, zusammengehaltener, zwischen sich Strömungskanäle freilassender Profilbleche besteht,
dadurch gekennzeichnet,
daß an zumindest zwei einander gegenüberliegenden Paketseiten (18, 19) mindestens die beiden äußeren Profilbleche (14, 15) als sandwichartig, formstabil miteinander verbundenes Profilblechepaar (17) ausgebildet sind.Heating plate package, for tangential or radial installation in trapezoidal segmented cells with heating surface supports of regenerative heat exchangers with fixed or rotating storage masses, which consists of a large number of adjacent, held together, between each flow channels exposed profile plates,
characterized,
that on at least two mutually opposite package sides (18, 19) at least the two outer profiled sheets (14, 15) are designed as a sandwich-like pair of profiled sheets (17) which are interconnected in a dimensionally stable manner. Heizblechpaket nach Anspruch 1,
dadurch gekennzeichnet,
daß das eine Profilblech (14) des Profilblechpaares (17) onduliert und das andere Profilblech (15) korrugiert ist.Heating plate package according to claim 1,
characterized,
that one profile sheet (14) of the profile sheet pair (17) undulates and the other profile sheet (15) is corrugated. Heizblechpaket nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Profilbleche (14, 15) durch Schweißpunkte (16) miteinander verbunden sind.Heating plate package according to claim 1 or 2,
characterized,
that the profile sheets (14, 15) are connected to one another by welding spots (16). Heizblechpaket nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß vertikale Außenholme (20) der Profilbleche (14, 15) mit paketober- und paketunterseitigen Horizontalholmen (21) verbunden sind.Heating plate package according to one of claims 1 to 3,
characterized,
that vertical outer spars (20) of the profiled sheets (14, 15) are connected to horizontal spars (21) on the top and bottom of the package. Heizblechpaket nach Anspruch 4,
dadurch gekennzeichnet,
daß die Stirnflächen (23) der Horizontalholme (21) auf der gleichen Höhe wie die Stirnflächen (24) der Radialwände (22) der Zellen (13) des Heizflächenträgers (4) liegen.Heating plate package according to claim 4,
characterized,
that the end faces (23) of the horizontal bars (21) are at the same height as the end faces (24) of the radial walls (22) of the cells (13) of the heating surface support (4).
EP96111403A 1995-08-04 1996-07-16 Pack of heat exchanger plates for regenerative heat exchanger Expired - Lifetime EP0757219B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19528634 1995-08-04
DE19528634A DE19528634A1 (en) 1995-08-04 1995-08-04 Heating plate package for regenerative heat exchangers

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EP0757219A2 true EP0757219A2 (en) 1997-02-05
EP0757219A3 EP0757219A3 (en) 1998-01-14
EP0757219B1 EP0757219B1 (en) 2002-09-18

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EP (1) EP0757219B1 (en)
JP (1) JPH09119790A (en)
AT (1) ATE224526T1 (en)
AU (1) AU699782B2 (en)
CZ (1) CZ288231B6 (en)
DE (2) DE19528634A1 (en)
HU (1) HU219043B (en)
PL (1) PL179713B1 (en)
ZA (1) ZA966572B (en)

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US7819176B2 (en) * 2003-03-03 2010-10-26 Paragon Airheater Technologies, Inc. Heat exchanger having powder coated elements
US7555891B2 (en) * 2004-11-12 2009-07-07 Board Of Trustees Of Michigan State University Wave rotor apparatus
EP2302172A1 (en) 2004-11-12 2011-03-30 Board of Trustees of Michigan State University Machine comprising an electromagnetic woven rotor and manufacturing method
WO2012116285A2 (en) 2011-02-25 2012-08-30 Board Of Trustees Of Michigan State University Wave disc engine apparatus
US10175006B2 (en) * 2013-11-25 2019-01-08 Arvos Ljungstrom Llc Heat transfer elements for a closed channel rotary regenerative air preheater
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CZ230396A3 (en) 1997-02-12
ATE224526T1 (en) 2002-10-15
AU6077096A (en) 1997-02-06
ZA966572B (en) 1998-05-18
PL315465A1 (en) 1997-02-17
US6253833B1 (en) 2001-07-03
HU219043B (en) 2001-02-28
EP0757219A3 (en) 1998-01-14
DE59609680D1 (en) 2002-10-24
HU9602121D0 (en) 1996-09-30
DE19528634A1 (en) 1997-02-06
AU699782B2 (en) 1998-12-17
CZ288231B6 (en) 2001-05-16
HUP9602121A3 (en) 1998-09-28
HUP9602121A2 (en) 1997-03-28
JPH09119790A (en) 1997-05-06
MX9603164A (en) 1997-07-31
PL179713B1 (en) 2000-10-31
EP0757219B1 (en) 2002-09-18

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