EP0233998B1 - Preset flue gas temperature-adjusting device - Google Patents

Preset flue gas temperature-adjusting device Download PDF

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Publication number
EP0233998B1
EP0233998B1 EP86115200A EP86115200A EP0233998B1 EP 0233998 B1 EP0233998 B1 EP 0233998B1 EP 86115200 A EP86115200 A EP 86115200A EP 86115200 A EP86115200 A EP 86115200A EP 0233998 B1 EP0233998 B1 EP 0233998B1
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EP
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Prior art keywords
flue gas
partition
duct
gas duct
heating surface
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EP86115200A
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German (de)
French (fr)
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EP0233998A1 (en
Inventor
Manfred Klein
Wilhelm Lindermann
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Deutsche Babcock Werke AG
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Deutsche Babcock Werke AG
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Application filed by Deutsche Babcock Werke AG filed Critical Deutsche Babcock Werke AG
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    • 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
    • F22B37/008—Adaptations for flue gas purification in steam generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/001—Controlling by flue gas dampers
    • 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
    • F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles

Definitions

  • the invention relates to a device for setting a predetermined outlet temperature of the flue gas leaving a steam generator which remains constant within a range, with the features of the preamble of patent claim 1.
  • the steam generators which are fired with fossil fuels, are operated in such a way that the flue gas temperature behind the last heating surface, which is an economizer, decreases with decreasing output of the steam generator.
  • the flue gas temperature In the event that a denitrification system for reducing the NOx content in the flue gas is provided in the flue gas system between the economizer and an air preheater heated by the flue gas, the flue gas temperature must be adjusted to the working range of this system. This means that the flue gas temperature must not fall below a certain level before the flue gas enters the denitrification system.
  • GB-A 1 577 202 describes an economizer which has a plurality of flue gas flues which take up heating surfaces. Flaps are arranged in the flue gas flues, through which the individual heating surfaces can be completely removed from the flue gas flow.
  • GB-A 756 067 describes a steam generator with a flue gas flue receiving a heating surface and an empty flue connected in parallel with it.
  • the empty train serving as a bypass duct is extended by a partition that penetrates an economizer located below the flue gas train and the empty train. Flaps are provided below the economizer. Depending on the flap position, two flue gas flows of different temperatures flow through the economiser.
  • the invention has for its object to provide a device by means of which the temperature of a flue gas supplied to a denitrification device can be kept above a permissible value regardless of the load of the steam generator, without an uneven temperature distribution occurring in the flue gas stream.
  • the last heating surface is completely or only partially exposed to flue gas. This reduces the heat dissipation of the flue gas and raises the outlet temperature while setting it to the desired value.
  • the partition prevents temperature imbalances in the flue gas by individually closing or opening the flaps when the load drops or rises.
  • the load range that can be influenced is expanded if several partition walls are provided. Since the partition or partitions are located transversely to the heating surfaces, water and steam-side temperature imbalances and uneven heat absorption within the heating surface are avoided. Finally, due to the vertical arrangement, the partition is insensitive to dirt and can therefore also be used in coal-fired steam generators.
  • the steam generator shown in Fig. 1 is designed as a feed boiler and contains only one interpreted combustion chamber 1, which is followed by a flue gas flue 2.
  • Combustion chamber 1 and flue gas flue 2 are formed by gas-tight welded tube walls.
  • At the outlet end of the flue gas duct 2 there is a flue gas duct 3, which is connected to an air preheater 5 via a flue gas line 4.
  • the smoke gas line 4 is led behind the air preheater 5 to a chimney, not shown.
  • heating surfaces 6, 7, 8 are arranged, which are connected as superheaters and as economizers. As is shown in more detail for the last heating surface 8 switched as an economizer in the flow direction of the flue gas, the heating surfaces 6, 7, 8 each consist of one or more tube bundles, the tubes of which are guided in several turns across the flue gas duct 2.
  • a denitrification plant 9 is arranged in the flue gas line 4 before entering the air preheater 5, in which the nitrogen oxides contained in the flue gas are reduced by adding ammonia and with the aid of catalysts.
  • the denitrification plant can only work in a certain temperature range of around 320 to 380 degrees Celsius. It must therefore be ensured that this temperature range is maintained regardless of the load range of the steam generator.
  • each partition 10 is arranged vertically in the area of the flue gas outlet in the flue gas duct 2.
  • Each partition 10 extends transversely to the heating surfaces 6, 7, 8 and extends to the ceiling of the flue gas duct 2.
  • the last heating surface 8 can be formed from smooth tubes or from finned tubes. If smooth pipes are used, each partition 10 penetrates the last heating surface 8. In this way, a cross-flow through the heating surface 8 is avoided.
  • the partition 10 can only partially penetrate the heating surface 8 or extend close to the penultimate heating surface 7. If the last heating surface 8 is made up of finned tubes which, by themselves, produce a vertical flow, the partition 10 begins immediately behind the last heating surface 8.
  • the partition 10 is provided behind the last heating surface 8 with rotatable flaps 11.
  • the outlet-side part of the flue gas flue 2 is thus divided into sections which are flowed through or not flowed through depending on the position of the flaps 11.
  • the section adjacent to the flue gas duct 3 and separated by the corresponding partition 10 has such a cross-section that the flue gas flows in it at minimum load at approximately the same flow rate as at full load over the entire cross section of the flue gas duct 2.
  • a plurality of partitions 10 When the load is reduced, a plurality of partitions 10 first closes the partition which is furthest away from the flue gas duct 3, specifically with the flap 11, which is also the most distant from the heating surface 8. So that the separated section is only partially or no longer flowed through by the flue gas, so that the last heating surface 8 is partially removed from the flue gas.
  • the flaps 11 are closed or opened when the load changes. Individual flaps 11 can also be closed, starting with the flap 11 that is furthest from the last heating surface 8. This type of flap actuation can also be used in the arrangement of a plurality of partition walls 10. In the open state, the flaps represent 11 flow control arms.
  • the steam generator shown in FIG. 2 is designed as a multi-pass boiler, in which the last flue gas train 2 is connected to the combustion chamber 1 or another flue gas train via a transverse train 12.
  • the last flue gas flue 2 flows through from top to bottom and ends in a funnel shape.
  • Two funnels 13 are formed, the partition wall 10 running into the apex between the funnels 13. If several partition walls 10 are provided, a further funnel can be arranged for each additional partition wall. It is also possible to have the partition wall 10 extend into the funnel 13.
  • the rotatable flaps 11 are designed according to FIG. 1 as multi-leaf flaps. These louvre flaps can also be replaced by a swing wing flap.
  • the partition 10 of the boiler shown in FIG. 2 is provided with such a swivel wing flap. Instead of this swivel wing flap, louvre flaps can also be used here.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chimneys And Flues (AREA)
  • Treating Waste Gases (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Control Of Combustion (AREA)

Abstract

1. Device for the adjustment of a preset exit temperature, which remains constant within a range, of the flue gas leaving a steam generator through a flue gas channel (3), wherein the steam generator displays a flue gas duct (2) connected with the flue gas channel (3), heating surfaces (6, 7, 8) are arranged in the flue gas duct (2) transversely to the flow direction of the flue gas, rotatable flaps (11) are arranged in flow direction of the flue gas behind the last heating surface (8), the flue gas channel (3) is connected with a denitrification plant (9) and an air preheater (5) connected downstream thereof on the flue gas side, characterised thereby, that the flue gas duct (2) is divided into sections at the exit end by at least one (10) arranged in flow direction of the flue gas behind the last heating surface (8) and transversely thereto, that this partition (10) is provided with the rotatable flaps (11) and that the partition (10) is arranged in the flue gas duct (2) at such a spacing from the transition into the flue gas channel (3) that about the same speed of flow of the flue gas prevails in that portion of the flue gas duct (2), which is separated off from the flue gas channel (3), at minimum load of the steam generator as over the entire cross-section of the undivided flue gas duct (2) at full load.

Description

Die Erfindung betrifft eine Vorrichtung zur Einstellung einer innerhalb eines Bereiches gleichbleibenden vorgegebenen Austrittstemperatur des einen Dampferzeuger verlassenden Rauchgases mit den Merkmalen des Oberbegriffes des Patentanspruches 1.The invention relates to a device for setting a predetermined outlet temperature of the flue gas leaving a steam generator which remains constant within a range, with the features of the preamble of patent claim 1.

Die mit fossilen Brennstoffen befeuerten Dampferzeuger sind so betrieben, daß die Rauchgastemperatur hinter der letzten Heizfläche, die einen Economiser darstellt, mit sinkender Leistung des Dampferzeugers abnimmt. Für den Fall, daß im Rauchgassystem zwischen dem Economiser und einem vom Rauchgas beheizten Luftvorwärmer eine Entstickungsanlage zur Reduktion des NOx-Gehaltes im Rauchgas vorgesehen ist, so ist die Rauchgastemperatur auf den Arbeitsbereich dieser Anlage abzustellen. Das bedeutet, daß eine bestimmte Rauchgastemperatur vor dem Eintritt des Rauchgases in die Entstickungsanlage nicht unterschritten werden darf. Bei einem aus der GB-A 1 544 169 bekannten Dampferzeuger wird das dadurch erreicht, daß die in Strömungsrichtung des Rauchgases vor der Entstickungsanlage liegende Heizfläche durch einen absperrbaren Bypasskanal umfahren werden kann. Je nachdem, welche Rauchgastemperatur vor dem Eintritt des Rauchgases in die Entstickungsanlage gemessen wird, wird der Rauchgasstrom so aufgeteilt, daß ein Teilstrom der genannten Heizfläche zugeführt und gekühlt wird, und der andere Teilstrom ungekühlt durch den Bypasskanal geführt wird. Beide Teilströme vereinigen sich vor dem Eintritt in die Entstickungsanlage wieder. Werden aber zwei Gasströme unterschiedlicher Temperatur zusammengeführt, so entstehen in dem vereinigten Gasstrom Gassträhnen unterschiedlicher Temperatur, weil ein Vermischen der Gasteilströme nur schwer zu erreichen ist.The steam generators, which are fired with fossil fuels, are operated in such a way that the flue gas temperature behind the last heating surface, which is an economizer, decreases with decreasing output of the steam generator. In the event that a denitrification system for reducing the NOx content in the flue gas is provided in the flue gas system between the economizer and an air preheater heated by the flue gas, the flue gas temperature must be adjusted to the working range of this system. This means that the flue gas temperature must not fall below a certain level before the flue gas enters the denitrification system. In a steam generator known from GB-A 1 544 169, this is achieved in that the heating surface located in the direction of flow of the flue gas in front of the denitrification plant can be bypassed by a lockable bypass channel. Depending on which flue gas temperature is measured before the flue gas enters the denitrification plant, the flue gas flow is divided so that a partial flow of the heating surface mentioned is fed and cooled, and the other partial flow is passed uncooled through the bypass duct. Both partial flows reunite before entering the denitrification plant. However, if two gas streams of different temperatures are brought together, gas streams of different temperatures are created in the combined gas stream because mixing of the gas partial streams is difficult to achieve.

Bei einem aus der FR-A 1 317 026 bekannten, nicht mit einer Entstickungsanlage ausgerüsteten Dampferzeuger schließen sich an dessen Brennkammer zwei parallel geschaltete Rauchgaszüge an, die durch eine Trennwand voneinander getrennt sind und in denen unterschiedliche Heizflächen angeordnet sind. Über ein in der Trennwand angeordnetes Drosselorgan können beide Rauchgaszüge oder nur ein Rauchgaszug von Rauchgas durchströmt werden. Je nach der Einstellung des Drosselorgans können die einzelnen in den Rauchgaszügen liegenden Heizflächen unterschiedlich stark beheizt werden.In a steam generator known from FR-A 1 317 026 and not equipped with a denitrification system, two flue gas flues connected in parallel are connected to its combustion chamber, which are separated from one another by a partition and in which different heating surfaces are arranged. Flue gas can flow through both flue gas flues or only one flue gas flue via a throttle element arranged in the partition. Depending on the setting of the throttle element, the individual heating surfaces in the flue gas flues can be heated to different extents.

In der GB-A 1 577 202 ist ein Economiser beschrieben, der mehrere Heizflächen aufnehmende Rauchgaszüge aufweist. In den Rauchgaszügen sind Klappen angeordnet, über die die einzelnen Heizflächen vollständig aus dem Rauchgasstrom herausgenommen werden können.GB-A 1 577 202 describes an economizer which has a plurality of flue gas flues which take up heating surfaces. Flaps are arranged in the flue gas flues, through which the individual heating surfaces can be completely removed from the flue gas flow.

Aus der DE-B 1 162 383 ist ein Abhitzekessel mit hintereinander angeordneten und Heizflächen aufnehmenden Rauchgaszügen bekannt. Unterhalb der Rauchgaszüge sind Staubabscheidertrichter angeordnet. Eine die Rauchgaszüge trennende Trennwand läuft auf den Scheitelpunkt zwischen zwei benachbarten Staubabscheidetrichtern zu, wobei zwischen dem Scheitelpunkt und der Trennwand eine Klappe angeordnet ist, durch die die in dem letzten Rauchgaszug liegende Heizfläche umfahren werden kann.From DE-B 1 162 383 a waste heat boiler with flue gas flues arranged one behind the other and receiving heating surfaces is known. Dust separator funnels are located below the flue gas flues. A partition separating the flue gas flues runs towards the apex between two adjacent dust separating funnels, a flap being arranged between the apex and the partition wall, through which the heating surface located in the last flue gas flue can be bypassed.

Bei keinem der aus der FR-A 1 317 026, der GB-A 1 577 202 und der DE-B 1 162 383 bekannten Dampferzeugern kann ein und dieselbe Heizfläche je nach der Klappenstellung vollständig von dem Rauchgasstrom beaufschlagt oder teilweise aus dem Rauchgasstrom herausgenommen werden. In der GB-A 756 067 ist ein Dampferzeuger mit einem eine Heizfläche aufnehmenden Rauchgaszug und einem dazu parallel geschalteten Leerzug beschrieben. Der als Bypasskanal dienende Leerzug ist durch eine Trennwand verlängert, die einen unterhalb des Rauchgaszuges und des Leerzuges liegenden Economiser quer durchdringt. Unterhalb des Economisers sind Klappen vorgesehen. Je nach der Klappenstellung wird der Economiser von zwei Rauchgasströmen unterschiedlicher Temperatur durchströmt.In none of the steam generators known from FR-A 1 317 026, GB-A 1 577 202 and DE-B 1 162 383, one and the same heating surface can be completely acted upon by the flue gas flow or partially removed from the flue gas flow, depending on the flap position . GB-A 756 067 describes a steam generator with a flue gas flue receiving a heating surface and an empty flue connected in parallel with it. The empty train serving as a bypass duct is extended by a partition that penetrates an economizer located below the flue gas train and the empty train. Flaps are provided below the economizer. Depending on the flap position, two flue gas flows of different temperatures flow through the economiser.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, durch die mit einfachen Mitteln die Temperatur eines einer Entstickungsvorrichtung zugeführten Rauchgases unabhängig von der Last des Dampferzeugers oberhalb eines zulässigen Wertes gehalten werden kann, ohne daß eine ungleichmäßige Temperaturverteilung in dem Rauchgasstrom eintritt.The invention has for its object to provide a device by means of which the temperature of a flue gas supplied to a denitrification device can be kept above a permissible value regardless of the load of the steam generator, without an uneven temperature distribution occurring in the flue gas stream.

Diese Aufgabe wird bei einer gattungsgemäßen Vorrichtung erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved in a generic device according to the invention by the characterizing features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.

Je nachdem, ob die Klappen der Trennwand geöffnet oder geschlossen sind, wird die letzte Heizfläche vollständig oder nur teilweise mit Rauchgas beaufschlagt. Dadurch wird der Wärmeabbau des Rauchgases reduziert und die Austrittstemperatur angehoben und dabei auf den gewünschten Wert eingestellt. Die Trennwand verhindert Temperaturschieflagen im Rauchgas, indem bei sinkender oder steigender Last die Klappen einzeln geschlossen oder geöffnet werden. Der beeinflußbare Lastbereich wird erweitert, wenn mehrere Trennwände vorgesehen sind. Da die Trennwand oder die Trennwände quer zu den Heizflächen liegen, werden wasser- und dampfseitige Temperaturschieflagen und ungleiche Wärmeaufnahmen innerhalb der Heizfläche vermieden. Schließlich ist die Trennwand durch die vertikale Anordnung unempfindlich gegen Verschmutzung und kann daher auch in kohlegefeuerten Dampferzeugern eingesetzt werden.Depending on whether the flaps of the partition are open or closed, the last heating surface is completely or only partially exposed to flue gas. This reduces the heat dissipation of the flue gas and raises the outlet temperature while setting it to the desired value. The partition prevents temperature imbalances in the flue gas by individually closing or opening the flaps when the load drops or rises. The load range that can be influenced is expanded if several partition walls are provided. Since the partition or partitions are located transversely to the heating surfaces, water and steam-side temperature imbalances and uneven heat absorption within the heating surface are avoided. Finally, due to the vertical arrangement, the partition is insensitive to dirt and can therefore also be used in coal-fired steam generators.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 den Längsschnitt durch einen Einzugkessel mit einer Vorrichtung gemäß der Erfindung und
  • Fig. 2 den Längsschnitt durch einen Mehrzugkessel mit einer Vorrichtung gemäß der Erfindung.
Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • Fig. 1 shows the longitudinal section through a feed boiler with a device according to the invention and
  • Fig. 2 shows the longitudinal section through a multi-pass boiler with a device according to the invention.

Der in Fig. 1 dargestellte Dampferzeuger ist als Einzugkessel ausgebildet und enthält einen nur angedeuteten Feuerraum 1, an den sich ein Rauchgaszug 2 anschließt. Feuerraum 1 und Rauchgaszug 2 sind durch gasdicht verschweißte Rohrwände gebildet. Am austrittsseitigen Ende des Rauchgaszuges 2 schließt sich ein Rauchgaskanal 3 an, der über eine Rauchgasleitung 4 mit einem Luftvorwärmer 5 verbunden ist. Die -Rauchgasleitung 4 ist hinter dem Luftvorwärmer 5 zu einem nicht dargestellten Kamin geführt.The steam generator shown in Fig. 1 is designed as a feed boiler and contains only one interpreted combustion chamber 1, which is followed by a flue gas flue 2. Combustion chamber 1 and flue gas flue 2 are formed by gas-tight welded tube walls. At the outlet end of the flue gas duct 2 there is a flue gas duct 3, which is connected to an air preheater 5 via a flue gas line 4. The smoke gas line 4 is led behind the air preheater 5 to a chimney, not shown.

In dem freien Querschnitt des Rauchgaszuges 2 sind Heizflächen 6, 7, 8 angeordnet, die als Überhitzer und als Economiser geschaltet sind. Wie für die in Strömungsrichtung des Rauchgases letzte, als Economiser geschaltete Heizfläche 8 näher dargestellt ist, bestehen die Heizflächen 6, 7, 8 aus jeweils einem oder mehreren Rohrbündeln, deren Rohre in mehreren Windungen quer durch den Rauchgaszug 2 geführt sind.In the free cross section of the flue gas flue 2, heating surfaces 6, 7, 8 are arranged, which are connected as superheaters and as economizers. As is shown in more detail for the last heating surface 8 switched as an economizer in the flow direction of the flue gas, the heating surfaces 6, 7, 8 each consist of one or more tube bundles, the tubes of which are guided in several turns across the flue gas duct 2.

In der Rauchgasleitung 4 ist vor dem Eintritt in den Luftvorwärmer 5 eine Entstickungsanlage 9 angeordnet, in der durch Zusatz von Ammoniak und unter Mitwirkung von Katalysatoren die im Rauchgas enthaltenen Stickoxide reduziert werden. Die Entstickungsanlage kann nur in einem bestimmten Temperaturbereich von etwa 320 bis 380 Grad C arbeiten. Es muß daher dafür gesorgt werden, daß dieser Temperaturbereich unabhängig von dem jeweiligen Lastbereich des Dampferzeugers eingehalten wird.A denitrification plant 9 is arranged in the flue gas line 4 before entering the air preheater 5, in which the nitrogen oxides contained in the flue gas are reduced by adding ammonia and with the aid of catalysts. The denitrification plant can only work in a certain temperature range of around 320 to 380 degrees Celsius. It must therefore be ensured that this temperature range is maintained regardless of the load range of the steam generator.

Im Bereich des Rauchgasaustrittes sind in dem Rauchgaszug 2 im dargestellten Fall zwei Trennwände 10 senkrecht angeordnet. Jede Trennwand 10 verläuft quer zu den Heizflächen 6, 7, 8 und reicht bis zur Decke des Rauchgaszuges 2. Die letzte Heizfläche 8 kann aus Glattrohren oder aus Rippenrohren gebildet sein. Sind Glattrohre verwendet, so durchdringt jede Trennwand 10 die letzte Heizfläche 8. Auf diese Weise wird eine Querdurchströmung der Heizfläche 8 vermieden. Je nach der sich aus der Auslegung des Rauchgaszuges 2 ergebenden Gasgeschwindigkeit, kann die Trennwand 10 die Heizfläche 8 auch nur teilweise durchdringen oder bis nahe an die vorletzte Heizfläche 7 reichen. Ist die letzte Heizfläche 8 aus Rippenrohren aufgebaut, die von sich aus eine Senkrechtdurchströmung bewirken, so beginnt die Trennwand 10 unmittelbar hinter der letzten Heizfläche 8.In the illustrated case, two partitions 10 are arranged vertically in the area of the flue gas outlet in the flue gas duct 2. Each partition 10 extends transversely to the heating surfaces 6, 7, 8 and extends to the ceiling of the flue gas duct 2. The last heating surface 8 can be formed from smooth tubes or from finned tubes. If smooth pipes are used, each partition 10 penetrates the last heating surface 8. In this way, a cross-flow through the heating surface 8 is avoided. Depending on the gas velocity resulting from the design of the flue gas flue 2, the partition 10 can only partially penetrate the heating surface 8 or extend close to the penultimate heating surface 7. If the last heating surface 8 is made up of finned tubes which, by themselves, produce a vertical flow, the partition 10 begins immediately behind the last heating surface 8.

Die Trennwand 10 ist hinter der letzten Heizfläche 8 mit drehbaren Klappen 11 versehen. Der austrittsseitige Teil des Rauchgaszuges 2 ist damit in Abschnitte aufgeteilt, die je nach der Stellung der Klappen 11 durchströmt oder nicht durchströmt sind. Dabei hat der dem Rauchgaskanal 3 benachbarte, durch die entsprechende Trennwand 10 abgetrennte Abschnitt einen solchen Querschnitt, daß in ihm bei Minimallast das Rauchgas etwa mit der gleichen Strömungsgeschwindigkeit strömt wie bei Vollast über den gesamten Querschnitt des Rauchgaszuges 2.The partition 10 is provided behind the last heating surface 8 with rotatable flaps 11. The outlet-side part of the flue gas flue 2 is thus divided into sections which are flowed through or not flowed through depending on the position of the flaps 11. The section adjacent to the flue gas duct 3 and separated by the corresponding partition 10 has such a cross-section that the flue gas flows in it at minimum load at approximately the same flow rate as at full load over the entire cross section of the flue gas duct 2.

Bei einer Verringerung der Last wird bei der Anordnung mehrerer Trennwände 10 zuerst die Trennwand geschlossen, die von dem Rauchgaskanal 3 am weitesten entfernt liegt, und zwar mit jeweils der Klappe 11, die von der Heizfläche 8 ebenfalls am weitesten entfernt angeordnet ist. Damit ist der abgetrennte Abschnitt nur noch teilweise oder nicht mehr von dem Rauchgas durchströmt, so daß die letzte Heizfläche 8 teilweise aus der Rauchgasbeaufschlagung herausgenommen ist.When the load is reduced, a plurality of partitions 10 first closes the partition which is furthest away from the flue gas duct 3, specifically with the flap 11, which is also the most distant from the heating surface 8. So that the separated section is only partially or no longer flowed through by the flue gas, so that the last heating surface 8 is partially removed from the flue gas.

Damit wird über diese Heizfläche 8 dem Rauchgas weniger Wärme entzogen und die Rauchgastemperatur beim Eintritt in den Rauchgaskanal 3 angehoben. Ist nur eine Trennwand 10 vorhanden, so werden die Klappen 11 bei einer Laständerung geschlossen bzw. geöffnet. Es können auch einzelne Klappen 11 beginnend mit der von der letzten Heizfläche 8 entferntesten Klappe 11 geschlossen werden. Diese Art der Klappenbetätigung kann auch bei der Anordnung von mehreren Trennwänden 10 angewendet werden. Im geöffneten Zustand stellen die Klappen 11 Strömungslenker dar.This means that less heat is extracted from the flue gas via this heating surface 8 and the flue gas temperature is raised when it enters the flue gas duct 3. If there is only one partition 10, the flaps 11 are closed or opened when the load changes. Individual flaps 11 can also be closed, starting with the flap 11 that is furthest from the last heating surface 8. This type of flap actuation can also be used in the arrangement of a plurality of partition walls 10. In the open state, the flaps represent 11 flow control arms.

Der in Fig. 2 dargestellte Dampferzeuger ist als Mehrzugkessel ausgebildet, bei dem der letzte Rauchgaszug 2 über einen Querzug 12 mit dem Feuerraum 1 oder einem anderen Rauchgaszug verbunden ist. Der letzte Rauchgaszug 2 ist von oben nach unten durchströmt und endet trichterförmig. Es werden zwei Trichter 13 gebildet, wobei die Trennwand 10 in den Scheitelpunkt zwischen den Trichtern 13 einläuft. Sind mehrere Trennwände 10 vorgesehen, so kann für jede weitere Trennwand ein weiterer Trichter angeordnet werden. Es ist auch möglich, die Trennwand 10 in den Trichter 13 hineinreichen zu lassen.The steam generator shown in FIG. 2 is designed as a multi-pass boiler, in which the last flue gas train 2 is connected to the combustion chamber 1 or another flue gas train via a transverse train 12. The last flue gas flue 2 flows through from top to bottom and ends in a funnel shape. Two funnels 13 are formed, the partition wall 10 running into the apex between the funnels 13. If several partition walls 10 are provided, a further funnel can be arranged for each additional partition wall. It is also possible to have the partition wall 10 extend into the funnel 13.

Die drehbaren Klappen 11 sind gemäß Fig. 1 als Jalousieklappen ausgebildet. Diese Jalousieklappen können auch durch eine Schwenkflügelklappe ersetzt werden. Mit einer solchen Schwenkflügelklappe ist die Trennwand 10 des in Fig. 2 dargestellten Kessels versehen. Anstatt dieser Schwenkflügelklappe können an dieser Stelle auch Jalousieklappen eingesetzt werden.The rotatable flaps 11 are designed according to FIG. 1 as multi-leaf flaps. These louvre flaps can also be replaced by a swing wing flap. The partition 10 of the boiler shown in FIG. 2 is provided with such a swivel wing flap. Instead of this swivel wing flap, louvre flaps can also be used here.

Claims (4)

1. Device for the adjustment of a preset exit temperature, which remains constant within a range, of the flue gas leaving a steam generator through a flue gas channel (3), wherein the steam generator displays a flue gas duct (2) connected with the flue gas channel (3), heating surfaces (6, 7, 8) are arranged in the flue gas duct (2) transversely to the flow direction of the flue gas, rotatable flaps (11) are arranged in flow direction of the flue gas behind the last heating surface (8), the flue gas channel (3) is connected with a denitrification plant (9) and an air preheater (5) connected downstream thereof on the flue gas side, characterised thereby, that the flue gas duct (2) is divided into sections at the exit end by at least one (10) arranged in flow direction of the flue gas behind the last heating surface (8) and transversely thereto, that this partition (10) is provided with the rotatable flaps (11) and that the partition (10) is arranged in the flue gas duct (2) at such a spacing from the transition into the flue gas channel (3) that about the same speed of flow of the flue gas prevails in that portion of the flue gas duct (2), which is separated off from the flue gas channel (3), at minimum load of the steam generator as over the entire cross-section of the undivided flue gas duct (2) at full load.
2. Device according to claim 1, characterised thereby, that the partition (10) penetrates at least a part of the last heating surface (8) transversely.
3. Device according to claim 1 or 2, characterised thereby, that several parallelly arranged partitions (10) are provided.
4. Device according to one or more of the claims 1 to 3, in which the flue gas duct (2) is flowed through downwardly from above and bounded in funnel shape at the lower end, characterised thereby, that several funnels (13) are provided and that each partition (10) runs out into the crest between two adjacent funnels (13).
EP86115200A 1986-02-28 1986-11-03 Preset flue gas temperature-adjusting device Expired - Lifetime EP0233998B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115200T ATE51063T1 (en) 1986-02-28 1986-11-03 DEVICE FOR ADJUSTMENT OF DEFAULT FLUE GAS TEMPERATURE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863606463 DE3606463A1 (en) 1986-02-28 1986-02-28 DEVICE FOR SETTING A PRESET SMOKE TEMPERATURE
DE3606463 1986-02-28

Publications (2)

Publication Number Publication Date
EP0233998A1 EP0233998A1 (en) 1987-09-02
EP0233998B1 true EP0233998B1 (en) 1990-03-14

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Application Number Title Priority Date Filing Date
EP86115200A Expired - Lifetime EP0233998B1 (en) 1986-02-28 1986-11-03 Preset flue gas temperature-adjusting device

Country Status (4)

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EP (1) EP0233998B1 (en)
JP (1) JPH0781696B2 (en)
AT (1) ATE51063T1 (en)
DE (2) DE3606463A1 (en)

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EP0595009B1 (en) * 1992-09-30 1996-01-10 Siemens Aktiengesellschaft Method of operating a power plant and power plant working according to this method
FR2699264B1 (en) * 1992-12-15 1995-01-20 Babcock Entreprise Heat exchanger fitted with an anti-erosion system.
AT402671B (en) * 1993-06-17 1997-07-25 Vaillant Gmbh HEATING DEVICE HEATING DEVICE
CH706152A1 (en) * 2012-02-29 2013-08-30 Alstom Technology Ltd Gas turbine plant with a waste heat boiler arrangement with exhaust gas recirculation.
CN103017137A (en) * 2012-12-27 2013-04-03 青岛胜利锅炉有限公司 Low-temperature corrosion resisting structure of boiler
CN109404948A (en) * 2018-10-31 2019-03-01 上海新业锅炉高科技有限公司 A kind of flue gas flow direction device changing heating surface

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JPS6219604A (en) * 1985-07-19 1987-01-28 川崎重工業株式会社 Controller for temperature of gas

Also Published As

Publication number Publication date
ATE51063T1 (en) 1990-03-15
JPH0781696B2 (en) 1995-09-06
JPS62206316A (en) 1987-09-10
EP0233998A1 (en) 1987-09-02
DE3606463A1 (en) 1987-09-03
DE3669579D1 (en) 1990-04-19

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