EP0956490B1 - Heat accumulator block for regenerative heat exchangers - Google Patents

Heat accumulator block for regenerative heat exchangers Download PDF

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Publication number
EP0956490B1
EP0956490B1 EP97953811A EP97953811A EP0956490B1 EP 0956490 B1 EP0956490 B1 EP 0956490B1 EP 97953811 A EP97953811 A EP 97953811A EP 97953811 A EP97953811 A EP 97953811A EP 0956490 B1 EP0956490 B1 EP 0956490B1
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EP
European Patent Office
Prior art keywords
protective plates
spacers
plates
heat storage
protective
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EP97953811A
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German (de)
French (fr)
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EP0956490A1 (en
Inventor
Bernd Bolle
Lothar STÜFCHEN
Franz-Josef Hagemann
Bernd Hewing
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Steag Energy Services GmbH
Brentwood Europe GmbH
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2H Kunststoff GmbH
Steag Encotec GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04Regenerative 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
    • F28D19/041Regenerative 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/01Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters

Definitions

  • the invention relates to a heat storage block for regenerative Heat exchanger with a plurality of heat exchanger plates, which are essential for the formation of flow channels are arranged parallel to each other, and a dirt trap for heat storage blocks of regenerative heat exchangers.
  • Heat storage blocks of this type usually have the Form of pie pieces and together form a rotor that crosses two zones in its circulation. In the first zone a hot medium is applied to it, which is heat to the heat exchanger plates. In the second zone it flows through a cold medium to which the previous stored heat is released.
  • the heat exchanger plates are generally made of steel and are for increasing their corrosion resistance is coated with enamel.
  • Regenerative heat exchangers are preferably used to Heat from a hot gas stream towards a cold gas stream transfer.
  • a key area of application is flue gas cleaning, for example in power plants and waste incineration plants, the flue gas in a flue gas desulfurization plant (REA) is washed. Before it is cooled, giving off its heat to the regenerative heat exchanger. Then reheating takes place using the heat stored in the heat exchanger.
  • REA flue gas desulfurization plant
  • the dew point is usually the the condensables contained in the flue gas are below. These sit on the heat exchanger plates of the heat storage blocks and form deposits there. Further is the cold gas coming from the REA to a certain extent Load liquid droplets and solid particles that also settle on the plates and the deposit effect reinforce.
  • the object of the invention is the service life to extend the heat storage blocks.
  • the invention is based on the knowledge that the deposits mainly in the flow from the cold medium Form area of the heat storage block, being essentially only a relatively short distance into the Extend the flow channels. Only falls below in this area the hot medium the dew point. For the cold Medium is the entry area with the highest Degree of pollution.
  • Mud flaps arranged. Its protective plates are practical no contribution to heat storage and transfer. It was found that the temperature difference at the Protection plates in the order of ⁇ 1 K. The Protection plates only provide the deposit area Available.
  • the extremely simple measure is sufficient the entry area of the protective plates free of spacers to let the buildup of the deposits so strongly delay that the time interval between the as multiplied before required cleaning processes. Accordingly the period between - also still required - exchange, whereby in the majority of cases, however, this only Strainer affects.
  • the cleaning medium strikes with reduced Balances on the spacers so that the ones to be included here Forces to a lesser extent tend to crack at the attachment points to evoke.
  • the protective plates are preferably made of elastic deformable plastic, especially made of polypropylene a thickness of 1 mm as this material is resistant to is chemical attacks and, other than for example ceramic Material, no relationship to the material of the Has deposits. It also favors due to its elastic Malleability the flaking of the deposits under the action of vibrations. Furthermore, installation voltages and thermal expansion is compensated for without the risk of cracking become.
  • the protective plates have a preferably wavy profile have, the ribs substantially in the direction of the flow channels. Thermal expansions have an effect under these circumstances, even cheap, because the evoked Movements support the flaking of the rubbers.
  • the spacers are advantageously in the form of small areas Bulges of the protective plates are formed. she are molded during the manufacture of the protective plates and enable very economical production in this way the strainer. They also only form a relative slight obstruction of the flow channels.
  • any spacer consists of a survey of one and a corresponding one Depression of the adjacent plate, being between the elevation and the deepening the fasteners are effective.
  • These can be of any design, for example as rivets or screws.
  • push-button connections in question.
  • joining processes apply such as welding or gluing.
  • the surveys and corresponding depressions the plate profiling arranged in a grid which is an establishment of the correspondence between neighboring protective plates by twisting one plate compared to the other by 180 ° in the plate plane. In this way, only a single plate structure needed.
  • the plates are in alternating orientation stacked and forming the spacers connected with each other.
  • the protective plates at least in the area of edges flowed from the cold medium conical projections have, the height of which is essentially the distance between adjacent protective plates.
  • the elastic Protective plates of the strainer are removed when cleaning flipped through like a deck of cards. Is a protective plate no longer under the influence of the cleaning medium, so she snaps back to her starting position, with the protrusions on the adjacent protective plate. These blows also promote flaking of the deposits.
  • the invention also provides a strainer for Heat storage blocks of regenerative heat exchangers, the Features emerge from the claims 9 to 16.
  • Fig. 1 shows a regenerative heat exchanger 1, the a flue gas desulfurization system, not shown (REA) is assigned.
  • the heat exchanger 1 has a rotor 2, which moves through two zones as it rotates. In the zone shown on the right, it is made from raw gas flowed through on the way to the REA.
  • the raw gas has a hot gas side a temperature of about 130 ° C and gives a part its heat to the rotor 2. It leaves the heat exchanger with a temperature of about 90 ° C.
  • the REA then cools down further to approx. 50 ° C.
  • the clean gas enters the left zone shown, flows through the rotor and takes some of the heat stored in the rotor. It leaves the heat exchanger with a temperature of around 90 ° C.
  • Cleaning devices 3 and 4 serve the rotor periodically cleaned.
  • the rotor consists of a plurality of pie-shaped Heat storage blocks 5, the cold gas side with dirt traps 6 are provided.
  • Each heat storage block has one Plurality of heat exchanger plates made from enamelled Steel sheet exist and are able to absorb heat, save and return.
  • the dirt traps 6 also exist, as shown in FIG. 2, from pie-shaped blocks 11, each of which is composed of a plurality of protective plates 12. These are with their lateral edges 13 (Fig. 3) on one Holding device 14 attached and form flow channels, which run perpendicular to the plane of the drawing in FIG. 2.
  • the protective plates 12 are spacers 15 (Fig. 4) kept at a distance from each other and to a stack of plates connected with each other.
  • a fastener in present case adhesive connections.
  • Each spacer 15 consists of an elevation 16 of a protective plate and a recess 17 of the neighboring Protective plate.
  • the surveys 16 and Wells 17 of each protective plate side by side in pairs arranged (Fig. 3).
  • the protective plates 12 consist of elastically deformable Plastic, namely made of polypropylene and can be used without Make another in the form shown. It can be worked with one and the same grid. Like Fig. 4 shows, adjacent protective plates 12 are of the same shape, however of alternating orientation, with neighboring ones Protection plates are rotated 180 ° against each other. Furthermore the protective plates have a profile, the Ribs 18 run parallel to the side edges 13.
  • the protective plates are made of elastically deformable polypropylene exist with a thickness of 1 mm, by Vibrations and movements due to thermal expansion support flaking of the deposits. Also compensate installation voltages.
  • the protective plates 12 are in the area of their edges flowed from the cold medium with conical projections 20 provided. If the protective plates vibrate hit these protrusions on neighboring protective plates and help to blow up the deposits.

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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)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

PCT No. PCT/EP97/07016 Sec. 371 Date Jun. 18, 1999 Sec. 102(e) Date Jun. 18, 1999 PCT Filed Dec. 16, 1997 PCT Pub. No. WO98/27394 PCT Pub. Date Jun. 25, 1998A heat accumulator block for regenerative heat exchangers has a heat exchanger of a plurality of heat exchanger plates arranged substantially parallel to one another for formation of flow channels. A dirt collector is arranged upstream of a side of the heat exchanger exposed to an inflowing cold medium. The dirt collector consists of a plurality of protective plates which are arranged substantially parallel to the heat exchanger plates and have a plurality of spacers. The spacers are arranged between neighboring plates and connect the neighboring plates to one another. The spacers are positioned at a spacing to those edges of the protective plates which are exposed to an inflowing cold medium.

Description

Die Erfindung betrifft einen Wärmespeicherblock für regenerative Wärmetauscher mit einer Mehrzahl von Wärmetauscherplatten, die zur Bildung von Strömungskanälen im wesentlichen parallel zueinander angeordnet sind, sowie einen Schmutzfänger für Wärmespeicherblöcke regenerativer Wärmetauscher.The invention relates to a heat storage block for regenerative Heat exchanger with a plurality of heat exchanger plates, which are essential for the formation of flow channels are arranged parallel to each other, and a dirt trap for heat storage blocks of regenerative heat exchangers.

Wärmespeicherblöcke dieser Art besitzen in der Regel die Form von Tortenstücken und bilden gemeinsam einen Rotor, der bei seinem Umlauf zwei Zonen durchquert. In der ersten Zone wird er mit einem heißen Medium beaufschlagt, welches Wärme an die Wärmetauscherplatten abgibt. In der zweiten Zone wird er von einem kalten Medium durchströmt, an welches die vorher gespeicherte Wärme abgegeben wird. Die Wärmetauscherplatten bestehen im allgemeinen aus Stahl und sind zur Erhöhung ihrer Koresionsbeständigkeit mit Emaille beschichtet.Heat storage blocks of this type usually have the Form of pie pieces and together form a rotor that crosses two zones in its circulation. In the first zone a hot medium is applied to it, which is heat to the heat exchanger plates. In the second zone it flows through a cold medium to which the previous stored heat is released. The heat exchanger plates are generally made of steel and are for increasing their corrosion resistance is coated with enamel.

Regenerative Wärmetauscher dienen bevorzugt dazu, die Wärme eines heißen Gasstroms auf einen kalten Gasstrom zu übertragen. Ein wesentliches Anwendungsgebiet ist die Rauchgasreinigung, beispielsweise in Kraftwerks- und Müllverbrennungsanlagen, wobei das Rauchgas in einer Rauchgasentschwefelungsanlage (REA) gewaschen wird. Vorher wird es gekühlt, wobei es seine Wärme an den regenerativen Wärmetauscher abgibt. Anschließend erfolgt eine Wiedererwärmung, und zwar unter Nutzung der im Wärmetauscher gespeicherten Wärme.Regenerative heat exchangers are preferably used to Heat from a hot gas stream towards a cold gas stream transfer. A key area of application is flue gas cleaning, for example in power plants and waste incineration plants, the flue gas in a flue gas desulfurization plant (REA) is washed. Before it is cooled, giving off its heat to the regenerative heat exchanger. Then reheating takes place using the heat stored in the heat exchanger.

Bei der Abkühlung wird in aller Regel der Taupunkt der im Rauchgas enthaltenen kondensierbaren Stoffe unterschritten. Diese setzen sich an den Wärmetauscherplatten der Wärmespeicherblöcke ab und bilden dort Ablagerungen. Ferner ist das aus der REA kommende kalte Gas in gewissem Umfange mit Flüssigkeitströpfchen und Feststoffpartikeln beladen, die sich ebenfalls an den Platten absetzen und den Ablagerungseffekt verstärken.When cooling down, the dew point is usually the the condensables contained in the flue gas are below. These sit on the heat exchanger plates of the heat storage blocks and form deposits there. Further is the cold gas coming from the REA to a certain extent Load liquid droplets and solid particles that also settle on the plates and the deposit effect reinforce.

Die in den Wärmespeicherblöcken gebildeten Kanäle setzen sich also zunehmend zu und bedürfen daher einer regelmäßigen, und zwar recht häufigen Abreinigung. Dies geschieht durch Bestrahlen mit Luft, Wasser oder Dampf. Bei jedem Reinigungsvorgang bleibt ein Rest der frisch gebildeten Ablagerungen auf den Platten haften, so daß das Zuwachsen der Kanäle durch die Reinigungsvorgänge lediglich verzögert wird. Sobald die Strömungskanäle durch die Reinigungsvorgänge nicht mehr ausreichend erweitert werden können, muß ein Austausch der Wärmespeicherblöcke vorgenommen werden.Place the channels formed in the heat storage blocks therefore increasingly and therefore need regular, and quite often cleaning. this happens by irradiation with air, water or steam. With every cleaning process remains a residue of the freshly formed deposits adhere to the plates so that the channels overgrow is only delayed by the cleaning processes. Once the flow channels through the cleaning processes An exchange must no longer be possible the heat storage blocks are made.

Der Erfindung liegt die Aufgabe zugrunde, die Standzeit der Wärmespeicherblöcke zu verlängern.The object of the invention is the service life to extend the heat storage blocks.

Zur Lösung dieser Aufgabe ist der eingangs genannte Wärmespeicherblock dadurch gekennzeichnet,

  • daß den Wärmetauscherplatten auf der vom kalten Medium angeströmten Seite ein Schmutzfänger vorgeschaltet ist,
  • daß der Schmutzfänger eine Mehrzahl von Schutzplatten aufweist, die im wesentlichen parallel zu den Wärmetauscherplatten ausgerichtet sind,
  • daß eine Mehrzahl von Abstandshaltern vorgesehen ist, die zwischen benachbarten Schutzplatten angeordnet sind und diese über Befestigungsmittel miteinander verbinden, und
  • daß die Abstandshalter mit Abstand zu den vom kalten Medium angeströmten Rändern der Schutzplatten angeordnet sind.
To solve this problem, the heat storage block mentioned at the outset is characterized in that
  • that a dirt trap is connected upstream of the heat exchanger plates on the side against which the cold medium flows,
  • that the strainer has a plurality of protective plates which are aligned essentially parallel to the heat exchanger plates,
  • that a plurality of spacers is provided, which are arranged between adjacent protective plates and connect them to one another via fastening means, and
  • that the spacers are arranged at a distance from the edges of the protective plates against which the cold medium flows.

Der Erfindung liegt die Erkenntnis zugrunde, daß sich die Ablagerungen vornehmlich in dem vom kalten Medium angeströmten Bereich des Wärmespeicherblocks bilden, wobei sie sich im wesentlichen nur ein relativ kurzes Stück in die Strömungskanäle hineinerstrecken. Erst in diesem Bereich unterschreitet das heiße Medium den Taupunkt. Für das kalte Medium handelt es sich um den Eintrittsbereich mit dem höchsten Verschmutzungsgrad. Hier ist der erfindungsgemäße Schmutzfänger angeordnet. Seine Schutzplatten leisten praktisch keinen Beitrag zur Wärmespeicherung und -übertragung. Es wurde gefunden, daß die Temperaturdifferenz an den Schutzplatten in der Größenordnung von ±1 K liegt. Die Schutzplatten stellen lediglich die Ablagerungsfläche zur Verfügung. The invention is based on the knowledge that the deposits mainly in the flow from the cold medium Form area of the heat storage block, being essentially only a relatively short distance into the Extend the flow channels. Only falls below in this area the hot medium the dew point. For the cold Medium is the entry area with the highest Degree of pollution. Here is the one according to the invention Mud flaps arranged. Its protective plates are practical no contribution to heat storage and transfer. It was found that the temperature difference at the Protection plates in the order of ± 1 K. The Protection plates only provide the deposit area Available.

Überraschenderweise genügt die extrem einfache Maßnahme, den Eintrittsbereich der Schutzplatten frei von Abstandshaltern zu lassen, um den Aufbau der Ablagerungen so stark zu verzögern, daß sich der Zeitabstand zwischen den nach wie vor erforderlichen Reinigungsvorgangen vervielfacht. Dementsprechend vervielfacht sich auch der Zeitraum zwischen dem - ebenfalls nach wie vor erforderlichen - Austausch, wobei dieser allerdings in der Mehrzahl der Fälle lediglich den Schmutzfänger betrifft.Surprisingly, the extremely simple measure is sufficient the entry area of the protective plates free of spacers to let the buildup of the deposits so strongly delay that the time interval between the as multiplied before required cleaning processes. Accordingly the period between - also still required - exchange, whereby in the majority of cases, however, this only Strainer affects.

Als zusätzlicher vorteilhafter Effekt ergibt sich, daß die nicht gegeneinander abgestützten Schutzplattenränder ein gewisses Maß an Bewegungsfreiheit haben. Sie können also in Vibration kommen, und zwar vor allen Dingen bei der Bestrahlung mit dem Reinigungsmedium, wodurch ein Abplatzen der Ablagerungen stark begünstigt wird.An additional advantageous effect is that the protective plate edges not supported against each other have some degree of freedom of movement. So you can in Vibration come, especially when it comes to radiation with the cleaning medium, causing flaking of the deposits is greatly favored.

Schließlich trifft das Reinigungsmedium mit verminderter Wucht auf die Abstandshalter, so daß die hier aufzunehmenden Kräfte in geringerem Maße dazu tendieren, Risse an den Befestigungsstellen hervorzurufen.Finally, the cleaning medium strikes with reduced Balances on the spacers so that the ones to be included here Forces to a lesser extent tend to crack at the attachment points to evoke.

Vorzugsweise bestehen die Schutzplatten aus elastisch verformbarem Kunststoff, insbesondere aus Polypropylen mit einer Dicke von 1 mm, da dieses Material resistent gegen chemische Angriffe ist und, anderers als beispielsweise keramisches Material, keine Verwandschaft mit dem Material der Ablagerungen hat. Auch begünstigt es aufgrund seiner elastischen Verformbarkeit das Abplatzen der Ablagerungen unter der Einwirkung von Vibrationen. Ferner können Einbauspannungen und Wärmedehnungen ohne die Gefahr von Rißbildungen kompensiert werden.The protective plates are preferably made of elastic deformable plastic, especially made of polypropylene a thickness of 1 mm as this material is resistant to is chemical attacks and, other than for example ceramic Material, no relationship to the material of the Has deposits. It also favors due to its elastic Malleability the flaking of the deposits under the action of vibrations. Furthermore, installation voltages and thermal expansion is compensated for without the risk of cracking become.

Diese Eigenschaften lassen sich noch dadurch steigern, daß die Schutzplatten eine vorzugsweise wellenförmige Profilierung aufweisen, deren Rippen im wesentlichen in Richtung der Strömungskanäle verlaufen. Wärmedehnungen wirken sich unter diesen Umständen sogar günstig aus, da die hervorgerufenen Bewegungen das Abplatzen der Beläge unterstützen. These properties can be increased by that the protective plates have a preferably wavy profile have, the ribs substantially in the direction of the flow channels. Thermal expansions have an effect under these circumstances, even cheap, because the evoked Movements support the flaking of the rubbers.

Vorteilhafterweise sind die Abstandshalter als kleinflächige Ausbuchtungen der Schutzplatten ausgebildet. Sie werden bei der Herstellung der Schutzplatten ausgeformt und ermöglichen auf diese Weise eine sehr wirtschaftliche Fertigung der Schmutzfänger. Außerdem bilden sie nur eine relativ geringfügige Versperrung der Strömungskanäle.The spacers are advantageously in the form of small areas Bulges of the protective plates are formed. she are molded during the manufacture of the protective plates and enable very economical production in this way the strainer. They also only form a relative slight obstruction of the flow channels.

Dabei wird als ganz besonders vorteilhafte Maßnahme vorgeschlagen, daß die die Abstandshalter bildenden Ausbuchtungen als Erhebungen und korrespondierende Vertiefungen der Platten-Profilierung ausgebildet sind. Jeder Abstandshalter besteht also aus einer Erhebung der einen und einer korrespondierenden Vertiefung der benachbarten Platte, wobei zwischen der Erhebung und der Vertiefung die Befestigungsmittel wirksam sind. Diese können beliebig ausgebildet sein, beispielsweise als Nieten oder Schrauben. Auch kommen Druckknopfverbindungen in Frage. Schließlich lassen sich Fügeverfahren anwenden, wie Schweißen oder Verkleben.It is proposed as a very particularly advantageous measure that the bulges forming the spacers as surveys and corresponding deepening of the Plate profiling are formed. Any spacer consists of a survey of one and a corresponding one Depression of the adjacent plate, being between the elevation and the deepening the fasteners are effective. These can be of any design, for example as rivets or screws. There are also push-button connections in question. Finally, joining processes apply such as welding or gluing.

In wesentlicher Weiterbildung der Erfindung wird vorgeschlagen, daß die Erhebungen und korrespondierenden Vertiefungen der Platten-Profilierung in einem Raster angeordnet sind, welches eine Herstellung der Korrespondenz zwischen benachbarten Schutzplatten durch Verdrehen der einen Platte gegenüber der anderen um 180° in der Plattenebene ermöglicht. Auf diese Weise wird lediglich eine einzige Plattenstruktur benötigt. Die Platten werden in abwechselnder Orientierung gestapelt und unter Bildung der Abstandshalter miteinander verbunden.In an essential further development of the invention it is proposed that the surveys and corresponding depressions the plate profiling arranged in a grid which is an establishment of the correspondence between neighboring protective plates by twisting one plate compared to the other by 180 ° in the plate plane. In this way, only a single plate structure needed. The plates are in alternating orientation stacked and forming the spacers connected with each other.

Als bevorzugtes Raster hat es sich erwiesen, je eine Erhebung und eine Vertiefung nebeneinander in den benachbarten Rippen der Platten-Profilierung auszubilden. Es entsteht ein sehr stabiler Aufbau des Plattenpaketes unter Ausbildung günstiger Strömungsverhältnisse in den Kanälen, wobei es keinerlei Probleme bereitet, den Abstand der Abstandshalter von den anströmseitigen Plattenrändern ausreichend weit zu wählen. It has proven to be the preferred grid, one survey each and a depression next to each other in the neighboring ones Form ribs of the panel profiling. It arises very stable construction of the plate pack under training more favorable flow conditions in the channels, it being the distance between the spacers does not pose any problems sufficiently far from the upstream plate edges choose.

In vorteilhafter Weiterbildung der Erfindung wird vorgeschlagen, daß die Schutzplatten mindestens im Bereich der vom kalten Medium angeströmten Ränder kegelförmige Vorsprünge aufweisen, deren Höhe im wesentlichen dem Abstand zwischen benachbarten Schutzplatten entspricht. Die elastischen Schutzplatten des Schmutzfängers werden beim Abreinigen wie ein Kartenstapel durchgeblättert. Steht eine Schutzplatte nicht mehr unter dem Einfluß des Reinigungsmediums, so schnellt sie in ihre Ausgangslage zurück, wobei sie mit den Vorsprüngen auf die benachbarte Schutzplatte schlägt. Diese Schläge fördern zusätzlich das Abplatzen der Ablagerungen.In an advantageous development of the invention, it is proposed that that the protective plates at least in the area of edges flowed from the cold medium conical projections have, the height of which is essentially the distance between adjacent protective plates. The elastic Protective plates of the strainer are removed when cleaning flipped through like a deck of cards. Is a protective plate no longer under the influence of the cleaning medium, so she snaps back to her starting position, with the protrusions on the adjacent protective plate. These blows also promote flaking of the deposits.

Die Erfindung schafft ferner einen Schmutzfänger für Wärmespeicherblöcke regenerativer Wärmetauscher, dessen Merkmale sich aus den Patentansprüchen 9 bis 16 ergeben.The invention also provides a strainer for Heat storage blocks of regenerative heat exchangers, the Features emerge from the claims 9 to 16.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels im Zusammenhang mit der beiliegenden Zeichnung näher erläutert. Die Zeichnung zeigt in:

Fig. 1
eine zum Teil geschnittene perspektivische Ansicht eines regenerativen Wärmetauschers;
Fig. 2
Schmutzfänger im Grundriß;
Fig. 3
eine Draufsicht auf einen Schutzplattenstapel; und
Fig. 4
in vergrößertem Maßstab einen Schnitt entlang der Linie IV-IV in Fig. 3.
The invention is explained below with reference to a preferred embodiment in connection with the accompanying drawings. The drawing shows in:
Fig. 1
a partially sectioned perspective view of a regenerative heat exchanger;
Fig. 2
Dirt trap in the floor plan;
Fig. 3
a plan view of a protective plate stack; and
Fig. 4
on an enlarged scale a section along the line IV-IV in Fig. 3rd

Fig. 1 zeigt einen regenerativen Wärmetauscher 1, der einer nicht dargestellten Rauchgasentschwefelungsanlage (REA) zugeordnet ist. Der Wärmetauscher 1 weist einen Rotor 2 auf, der sich bei seinem Umlauf durch zwei Zonen hindurchbewegt. In der rechts dargestellten Zone wird er von Rohgas auf dem Wege zur REA durchströmt. Das Rohgas besitzt heißgasseitig eine Temperatur von etwa 130°C und gibt einen Teil seiner Wärme an den Rotor 2 ab. Es verläßt den Wärmetauscher mit einer Temperatur von etwa 90°C. Fig. 1 shows a regenerative heat exchanger 1, the a flue gas desulfurization system, not shown (REA) is assigned. The heat exchanger 1 has a rotor 2, which moves through two zones as it rotates. In the zone shown on the right, it is made from raw gas flowed through on the way to the REA. The raw gas has a hot gas side a temperature of about 130 ° C and gives a part its heat to the rotor 2. It leaves the heat exchanger with a temperature of about 90 ° C.

In der REA erfolgt dann eine weitere Abkühlung auf ca. 50°C. Mit dieser Temperatur tritt das Reingas in die links dargestellte Zone ein, durchströmt den Rotor und nimmt dabei einen Teil der im Rotor gespeicherten Wärme auf. Es verläßt den Wärmetauscher mit einer Temperatur von etwa 90°C.The REA then cools down further to approx. 50 ° C. At this temperature, the clean gas enters the left zone shown, flows through the rotor and takes some of the heat stored in the rotor. It leaves the heat exchanger with a temperature of around 90 ° C.

Reinigungseinrichtungen 3 und 4 dienen dazu, den Rotor periodisch abzureinigen.Cleaning devices 3 and 4 serve the rotor periodically cleaned.

Der Rotor besteht aus einer Mehrzahl von tortenstückförmigen Wärmespeicherblöcken 5, die kaltgasseitig mit Schmutzfängern 6 versehen sind. Jeder Wärmespeicherblock weist eine Mehrzahl von Wärmetauscherplatten auf, die aus emailliertem Stahlblech bestehen und in der Lage sind, Wärme aufzunehmen, zu speichern und wieder abzugeben.The rotor consists of a plurality of pie-shaped Heat storage blocks 5, the cold gas side with dirt traps 6 are provided. Each heat storage block has one Plurality of heat exchanger plates made from enamelled Steel sheet exist and are able to absorb heat, save and return.

Auch die Schmutzfänger 6 bestehen, wie in Figur 2 dargestellt, aus tortenstückförmigen Blöcken 11, von denen jeder aus einer Mehrzahl von Schutzplatten 12 zusammengesetzt ist. Diese sind mit ihren seitlichen Rändern 13 (Fig. 3) an einer Halteeinrichtung 14 befestigt und bilden Strömungskanäle, die senkrecht zur Zeichenebene von Fig. 2 verlaufen.The dirt traps 6 also exist, as shown in FIG. 2, from pie-shaped blocks 11, each of which is composed of a plurality of protective plates 12. These are with their lateral edges 13 (Fig. 3) on one Holding device 14 attached and form flow channels, which run perpendicular to the plane of the drawing in FIG. 2.

Die Schutzplatten 12 werden von Abstandshaltern 15 (Fig. 4) im Abstand zueinander gehalten und zu einem Plattenstapel miteinander verbunden. Als Befestigungsmittel dienen im vorliegenden Falle Klebeverbindungen.The protective plates 12 are spacers 15 (Fig. 4) kept at a distance from each other and to a stack of plates connected with each other. As a fastener in present case adhesive connections.

Jeder Abstandshalter 15 besteht aus einer Erhebung 16 der einen Schutzplatte und einer Vertiefung 17 der benachbarten Schutzplatte. Dabei sind die Erhebungen 16 und die Vertiefungen 17 jeder Schutzplatte paarweise nebeneinander angeordnet (Fig. 3).Each spacer 15 consists of an elevation 16 of a protective plate and a recess 17 of the neighboring Protective plate. The surveys 16 and Wells 17 of each protective plate side by side in pairs arranged (Fig. 3).

Die Schutzplatten 12 bestehen aus elastisch verformbarem Kunststoff, nämlich aus Polypropylen und lassen sich ohne weiteres in der dargestellten Form herstellen. Dabei kann mit ein und demselben Raster gearbeitet werden. Wie Fig. 4 zeigt, sind benachbarte Schutzplatten 12 von gleicher Form, jedoch von abwechselnder Orientierung, wobei benachbarte Schutzplatten um 180° gegeneinander verdreht sind. Im übrigen besitzen die Schutzplatten eine Profilierung, deren Rippen 18 parallel zu den Seitenrändern 13 verlaufen.The protective plates 12 consist of elastically deformable Plastic, namely made of polypropylene and can be used without Make another in the form shown. It can be worked with one and the same grid. Like Fig. 4 shows, adjacent protective plates 12 are of the same shape, however of alternating orientation, with neighboring ones Protection plates are rotated 180 ° against each other. Furthermore the protective plates have a profile, the Ribs 18 run parallel to the side edges 13.

Wie aus Fig. 3 ersichtlich, sind die Erhebungen 16 und die Vertiefungen 17, die die Abstandshalter 15 bilden, im Abstand zu den stirnseitigen Rändern 19 der Schutzplatten 12 angeordnet. Im Bereich dieser Ränder findet die Bildung der Ablagerungen statt, im vorliegenden Falle allerdings in stark abgeschwächtem Umfang, da sich die Abstandshalter 15 nicht in diesen Bereich hineinerstrecken. Bei den erforderlichen Abreinigungsvorgängen werden die Abstandshalter auch entsprechend weniger beansprucht.3, the elevations 16 and the recesses 17 which form the spacers 15 in Distance to the front edges 19 of the protective plates 12 arranged. In the area of these edges the formation of the Deposits take place, but in the present case in severely weakened extent, since the spacers 15 do not stretch into this area. With the required The spacers also do cleaning operations accordingly less stressed.

Da die Schutzplatten aus elastisch verformbarem Polypropylen mit einer Dicke von 1 mm bestehen, können sie durch Vibrationen und durch Bewegungen aufgrund von Wärmedehnungen ein Abplatzen der Ablagerungen unterstützen. Auch kompensieren sie Einbauspannungen.Because the protective plates are made of elastically deformable polypropylene exist with a thickness of 1 mm, by Vibrations and movements due to thermal expansion support flaking of the deposits. Also compensate installation voltages.

Beispielsweise genügt es, die Schmutzfänger 6 mittels der Einrichtung 4 einmal täglich mit Druckluft von ca. 2 bar abzureinigen. Aufgrund des verstärkten Abplatzens der Ablagerungen ist eine weitergehende Reinigung mit einem Wasserstrahl von ca. 40 bis 100 bar, die bisher alle vier Wochen durchgeführt werden mußte, jetzt frühestens nach fünf Monaten erforderlich.For example, it is sufficient to use the dirt trap 6 the device 4 once a day with compressed air of approx. 2 bar to clean. Due to the increased flaking of the deposits is a further cleaning with a water jet from approx. 40 to 100 bar, which was previously every four weeks had to be carried out, now at the earliest after five months required.

Ein Austausch des Schmutzfängers 6 ist lediglich alle drei Jahre erforderlich und läßt sich äußerst kostengünstig durchführen.An exchange of the strainer 6 is only all three years required and can be extremely inexpensive carry out.

Da sich die Ablagerungen in den Schmutzfängern sehr langsam aufbauen, bleiben deren Strömungskanäle stets durchlässig. Dadurch bilden sich im Rotor 2 keine vom durchströmenden Kaltgas abgeschirmte Bereiche, die der Korrosion verstärkt unterliegen. Im Ergebnis verlängert sich die Standzeit der Wärmetauscherbleche auf ca. 10 Jahre. Eine erhebliche Kostenreduzierung ist die Folge.Because the deposits in the mud flaps are very build up slowly, their flow channels always remain permeable. As a result, none of the flowing through form in the rotor 2 Cold gas shielded areas that reinforce the corrosion subject to. As a result, the service life is extended of the heat exchanger plates for approx. 10 years. A significant one The result is a reduction in costs.

Nach Fig. 4 sind die Schutzplatten 12 im Bereich ihrer vom kalten Medium angeströmten Ränder mit kegelförmigen Vorsprüngen 20 versehen. Bei Vibrationen der Schutzplatten schlagen diese Vorsprünge auf benachbarte Schutzplatten und tragen dazu bei, die Ablagerungen abzusprengen.4, the protective plates 12 are in the area of their edges flowed from the cold medium with conical projections 20 provided. If the protective plates vibrate hit these protrusions on neighboring protective plates and help to blow up the deposits.

Im Rahmen der Erfindung sind durchaus Abwandlungsmöglichkeiten gegeben. So kann die Profilierung der Schutzplatten anders als in Fig. 4 dargestellt aussehen. Denkbar sind selbstverständlich auch ebene Schutzplatten. Ferner besteht die Möglichkeit, abgewandelte Ausführungsformen von Abstandshaltern zu verwenden. Beispielsweise kommen gesonderte Bauteile in Frage. Wesentlich ist, daß der stirnseitige Randbereich der Schutzplatten zumindest auf der Anströmseite des kalten Mediums von Abstandshaltern freigehalten wird. Werden die Abstandshalter, wie dargestellt, als Ausbuchtungen ausgebildet, so kann die Formgebung derart gewählt werden, daß Ausbuchtungen der einen Schutzplatte mit normalen Flächenabschnitten der benachbarten Schutzplatte zusammenwirken. Als Befestigungsmittel kommt beispielsweise eine Punktschweißung in Frage.Within the scope of the invention there are possibilities for modification given. So the profiling of the protective plates look different than shown in Fig. 4. Are conceivable Of course, even protective plates. There is also the possibility of modified embodiments of spacers to use. For example, there are separate ones Components in question. It is essential that the front Edge area of the protective plates at least on the upstream side the cold medium is kept clear of spacers. Are the spacers as shown as Bulges formed, the shape can be such be chosen that bulges of a protective plate with normal surface sections of the neighboring protective plate work together. As a fastener comes for example a spot weld in question.

Möglich ist es auch, die Wärmetauscherplatten ebenso wie die Schutzplatten auszubilden.It is also possible to use the heat exchanger plates as well to form the protective plates.

Claims (16)

  1. Heat storage block for regenerative heat exchanger, with a plurality of heat exchanger plates, which are arranged substantially parallel to one another for formation of flow channels, characterised in that
    a contaminant collector (6) is connected upstream of the heat exchanger plates on the side flowed against by the cold medium,
    the contaminant collector (6) comprises a plurality of protective plates (12), which are aligned substantially parallel to the heat exchanger plates,
    a plurality of spacers (15) is provided, which spacers are arranged between adjacent protective plates and connect these together by way of fastening means, and
    the spacers (15) are arranged at a spacing from the edges, which are flowed against by the cold medium, of the protective plates (12).
  2. Heat storage block according to claim 1, characterised in that the protective plates (12) consist of resiliently deformable synthetic material, in particular polypropylene, and have a layer thickness of about 1 millimetre.
  3. Heat storage block according to claim 1 or 2, characterised in that the protective plates (12) have a preferably wave-shaped profiling, the ribs (18) of which extend substantially in the direction of the flow channels.
  4. Heat storage block according to one of claims 1 to 3, characterised in that the spacers (15) are formed as small-area bulges of the protective plates (12).
  5. Heat storage block according to claim 4, characterised in that the bulges forming the spacers (15) are formed as elevations (16) and corresponding depressions (17) of the plate profiling.
  6. Heat storage block according to claim 5, characterised in that the elevations (16) and the corresponding depressions (17) of the plate profiling are arranged in a grid, which enables production of the correspondence between adjacent protective plates (12) by turning the one protective plate relative to the other through 180° in the plate plane.
  7. Heat storage block according to claim 6, characterised in that each elevation (16) and each depression (17) are arranged adjacent to one another in respective adjacent ribs (18) of the plate profiling.
  8. Heat storage block according to one of claims 1 to 7, characterised in that the protective plates (12) have conical protrusions (20), the height of which substantially corresponds to the spacing between adjacent protective plates, at least in the region of the edges flowed against by the cold medium.
  9. Contaminant collector for heat storage blocks of regenerative heat exchangers, characterised by a plurality of protective plates (12), which are arranged substantially parallel to one another for formation of flow channels, and a plurality of spacers (15), which are arranged between adjacent protective plates (12) and connect these together by way of fastening means, wherein the spacers (15) are arranged at a spacing from the edges, which are flowed against by the cold medium, of the protective plates (12).
  10. Contaminant collector according to claim 9, characterised in that the protective plates (2) consist of resiliently deformable synthetic material, in particular polypropylene, and have a layer thickness of about 1 millimetre.
  11. Contaminant collector according to claim 9 or 10, characterised in that the protective plates (2) have a preferably wave-shaped profiling, the ribs (8) of which extend substantially in the direction of the flow channels.
  12. Contaminant collector according to one of claims 9 to 11, characterised in that the spacers (5) are formed as small-area bulges of the protective plates (2).
  13. Contaminant collector according to claim 12, characterised in that the bulges forming the spacers (5) are formed as elevations (6) and corresponding depressions (7) of the plate profiling.
  14. Contaminant collector according to claim 13, characterised in that the elevations (6) and the corresponding depressions (7) of the plate profiling are arranged in a grid, which enables a production of the correspondence between adjacent protective plates (2) by turning the one protective plate relative to the other through 180° in the plate plane.
  15. Contaminant collector according to claim 14, characterised in that each elevation (6) and each depression (7) are arranged adjacent to one another in respective adjacent ribs (8) of the plate profiling.
  16. Contaminant collector according to one of claims 9 to 15, characterised in that the protective plates (12) have conical protrusions (20), the height of which substantially corresponds to the spacing between adjacent protective plates, at least in the region of the edges flowed against by the cold medium.
EP97953811A 1996-12-19 1997-12-13 Heat accumulator block for regenerative heat exchangers Expired - Lifetime EP0956490B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19652999A DE19652999C2 (en) 1996-12-19 1996-12-19 Heat storage block for regenerative heat exchangers
DE19652999 1996-12-19
PCT/EP1997/007016 WO1998027394A1 (en) 1996-12-19 1997-12-13 Heat accumulator block for regenerative heat exchangers

Publications (2)

Publication Number Publication Date
EP0956490A1 EP0956490A1 (en) 1999-11-17
EP0956490B1 true EP0956490B1 (en) 2001-01-31

Family

ID=7815347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97953811A Expired - Lifetime EP0956490B1 (en) 1996-12-19 1997-12-13 Heat accumulator block for regenerative heat exchangers

Country Status (6)

Country Link
US (1) US6145582A (en)
EP (1) EP0956490B1 (en)
AT (1) ATE199040T1 (en)
DE (2) DE19652999C2 (en)
DK (1) DK0956490T3 (en)
WO (1) WO1998027394A1 (en)

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Also Published As

Publication number Publication date
DE19652999C2 (en) 1999-06-24
US6145582A (en) 2000-11-14
DE19652999A1 (en) 1998-06-25
WO1998027394A1 (en) 1998-06-25
DE59702983D1 (en) 2001-03-08
EP0956490A1 (en) 1999-11-17
ATE199040T1 (en) 2001-02-15
DK0956490T3 (en) 2001-06-11

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