EP0606630B1 - Method of discharging purified flue gases - Google Patents
Method of discharging purified flue gases Download PDFInfo
- Publication number
- EP0606630B1 EP0606630B1 EP93120660A EP93120660A EP0606630B1 EP 0606630 B1 EP0606630 B1 EP 0606630B1 EP 93120660 A EP93120660 A EP 93120660A EP 93120660 A EP93120660 A EP 93120660A EP 0606630 B1 EP0606630 B1 EP 0606630B1
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- European Patent Office
- Prior art keywords
- gases
- clean
- gas
- chimney
- pure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/02—Linings; Jackets; Casings
Definitions
- the invention relates to a method for discharging flue gases (clean gases), cleaned by catalytic denitrification, dedusting and wet desulfurization, of a combustion system, in particular a power plant operated with fossil fuels, into the atmosphere, in which the steam-saturated clean gases after exiting the flue gas desulfurization system by means of a suction fan the chimney fed and heated before entering the fireplace.
- flue gases clean gases
- a suction fan the chimney fed and heated before entering the fireplace.
- the desulfurized and denitrified flue gases are usually reheated before they enter the chimney by a regenerative heat exchanger which is heated with raw gas that has not yet been desulfurized and releases its heat to the desulfurized clean gases.
- gaseous sulfuric acid contained in the raw gas condenses on the heat transfer surfaces of the regenerative heat exchanger, water and hydrogen fluoride being incorporated.
- the condensate film of this acid leads not only to severe corrosion on the components and heat transfer surfaces of the regenerative heat exchanger, but also to a precipitation of dust particles on the liquid film that forms on the heat transfer surfaces.
- Such a circuit arrangement in which the clean gases are heated again via a recuperative gas preheater, is known, for example, from the journal Fuel-Heat-Power, Volume 36 No. 10, October 1984, pages 427 to 431.
- a clean gas blower can be arranged between the scrubber of a flue gas desulfurization system and the gas preheater.
- the temperature of the clean gas increases due to the compression work of the fan.
- this arrangement has the disadvantages described above of the reheating of the clean gases by means of regenerative heat exchangers, namely pressure losses in the area of the heat exchangers and a strong risk of corrosion of the heat transfer surfaces.
- the invention has for its object to provide a method for discharging clean gases of the type described above, which on the one hand avoids the disadvantages described above when reheating the clean gases by regenerative or recuperative heat exchangers and on the other hand does not cause other emissions or higher immissions.
- the solution to this problem by the invention is characterized in that during operation the heating of the clean gases takes place by utilizing the polytropic compression work of the induced draft fan arranged between the flue gas desulfurization system and the chimney, that during operation the wall of the clean gas duct between the fan outlet and the chimney outlet is above the temperature of the clean gas is heated and that additional heating of the clean gases takes place only before the entry into the chimney during start-up times and other phases with increased moisture.
- the clean gas channel wall can be electrically heated according to a further feature of the invention.
- the process according to the invention has the advantage that the elimination of an expensive heat exchanger, which is susceptible to failure due to corrosion, on the one hand reduces system and maintenance and repair costs, and on the other hand avoids pressure losses caused by the heat exchanger. Eliminating a regenerative heat exchanger also avoids the risk of sulfuric acid, hydrogen fluoride and highly corrosive coarse particles being emitted. Since the induced draft fan must be available for the discharge of the flue gases in any case, required the method according to the invention does not involve the use of an additional component, but merely its arrangement behind the flue gas desulfurization system and the design as a so-called wet fan.
- the additional heating of the pure gases to be carried out according to the invention only during the start-up times and other phases with increased moisture accumulation can be carried out with the aid of a relatively small heat exchanger of any type, for example a steam-heated air preheater, so that the structural and energy expenditure required for this can be kept low.
- a relatively small heat exchanger of any type for example a steam-heated air preheater
- the heating of the clean gas duct wall between the fan outlet and the chimney outlet which takes place according to the invention both during the start-up and shutdown times and during normal operation, requires only a small amount of construction in relation to the heat exchanger which is omitted, in particular if an electric heater is used.
- the heating output is also low. For example, in a 120 m chimney for a power plant with 500 MW electrical output, it is only 300 kW.
- the invention provides a method for discharging flue gases cleaned by catalytic denitrification, dedusting and wet desulfurization into the atmosphere which, despite avoiding the disadvantages of the known methods described at the outset compared to these methods, requires less equipment and less energy consumption.
- FIG. 1 shows a steam generator 1, to which fuel and combustion air heated via an air preheater 2 are fed and the flue gases indicated by an arrow are first fed to a catalytic denoxification plant 3.
- the flue gases loaded with SO 3 and HF give off part of their heat to the combustion air in the air preheater 2 and are then dedusted in an electrostatic filter 4.
- a reduction in NO x to 200 mg / m 3 takes place in the denitrification plant 3 ; Dust is removed in the electrostatic filter to approximately 50 mg / m 3 .
- the denitrified and dedusted flue gas is then fed to a flue gas desulfurization system 5, in which the flue gas is desulfurized to about 400 mg / m 3 by adding lime milk and carrier air in a wet process.
- the gypsum obtained in the flue gas desulfurization system 5 is drawn off.
- the flue gas (clean gas) cleaned by catalytic denitrification, dust removal and wet desulfurization is sucked out of the flue gas desulfurization system 5 by a suction fan 6 and fed to the chimney 7 connected downstream.
- the clean gas duct 8, which runs between the outlet from the induced draft fan 6 and the mouth of the chimney 7, is provided with an electrical heater 9 and also with thermal insulation 10.
- the induced draft fan 6 is designed such that the clean gases are heated up due to the polytropic compression work of the induced draft fan 6. Since this does not suffice to dry the clean gas as a whole during normal operation of the power plant, ie with the suction fan 6 running, the clean gas duct 8 is heated to a temperature above the clean gas temperature to avoid condensation, for example, by means of an additional heater 11 shown in dashed lines in FIG.
- the clean gases are discharged through a cooling tower 7a.
- the temperature and pressure curve are plotted in a diagram. The diagram shows that even without operation of the additional heater 11 shown in broken lines, the induced draft fan 6 causes the temperature of the clean gases to rise from 48 ° C. to 53 ° C. Since the clean gases are discharged into the atmosphere through a cooling tower 7a heated by heat exchange, additional heating of the clean gases in the cooling tower 7a and also additional heating 11 can be dispensed with if the clean gas line between the fan outlet and the cooling tower is not too long.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Ableitung von durch katalytische Entstickung, Entstaubung und Naßentschwefelung gereinigten Rauchgasen (Reingasen) einer Feuerungsanlage, insbesondere eines mit fossilen Brennstoffen betriebenen Kraftwerks, in die Atmosphäre, bei dem die wasserdampfgesättigten Reingase nach Austritt aus der Rauchgasentschwefelungsanlage durch ein Saugzuggebläse dem Kamin zugeführt und vor dem Eintritt in den Kamin aufgeheizt werden.The invention relates to a method for discharging flue gases (clean gases), cleaned by catalytic denitrification, dedusting and wet desulfurization, of a combustion system, in particular a power plant operated with fossil fuels, into the atmosphere, in which the steam-saturated clean gases after exiting the flue gas desulfurization system by means of a suction fan the chimney fed and heated before entering the fireplace.
Bei den in Betrieb befindlichen Kraftwerken erfolgt die Wiederaufheizung der entschwefelten und entstickten Rauchgase vor deren Eintritt in den Kamin üblicherweise durch einen regenerativen Wärmetauscher, der mit noch nicht entschwefeltem Rohgas beheizt wird und seine Wärme an die entschwefelten Reingase abgibt. Hierbei kondensiert im Rohgas enthaltene, gasförmige Schwefelsäure an den Wärmeübertragungsflächen des regenerativen Wärmetauschers, wobei Wasser und Fluorwasserstoff eingebunden werden. Der Kondensatfilm dieser Säure führt nicht nur zu einer starken Korrosion an den Bauteilen und Wärmeübertragungsflächen des regenerativen Wärmetauschers, sondern auch zu einem Niederschlag von Staubpartikeln auf dem sich an den Wärmeübertragungsflächen ausbildenden Flüssigkeitsfilm. Nach Verschieben der mit Rohgas beaufschlagten Wärmeübertragungsflächen in den Strom des gereinigten Rauchgases verdunsten 25 bis 30 % der rohgasseitig vorhandenen Schwefelsäure bzw. des Fluorwasserstoffs. Außer dieser Emission gelangen auch Partikel des aus den Bauteilen und den Wärmeübertragungsflächen des regenerativen Wärmetauschers abkorrodierten Materials in das Reingas, und zwar insbesondere während Anfahrphasen infolge der hierbei auftretenden thermischen Spannungen.In the power plants in operation, the desulfurized and denitrified flue gases are usually reheated before they enter the chimney by a regenerative heat exchanger which is heated with raw gas that has not yet been desulfurized and releases its heat to the desulfurized clean gases. Here, gaseous sulfuric acid contained in the raw gas condenses on the heat transfer surfaces of the regenerative heat exchanger, water and hydrogen fluoride being incorporated. The condensate film of this acid leads not only to severe corrosion on the components and heat transfer surfaces of the regenerative heat exchanger, but also to a precipitation of dust particles on the liquid film that forms on the heat transfer surfaces. After moving the heat transfer surfaces charged with raw gas into the stream of cleaned flue gas, 25 to 30% of the sulfuric acid or hydrogen fluoride present on the raw gas side evaporate. In addition to this emission, particles also get of the material corroded from the components and the heat transfer surfaces of the regenerative heat exchanger into the clean gas, in particular during start-up phases as a result of the thermal stresses occurring here.
Zusätzlich zu den voranstehend beschriebenen Nachteilen der Emission von Schwefelsäure, Fluorwasserstoff und stark korrosiven Grobpartikeln müssen bei der Wiederaufheizung der Reingase durch regenerative Wärmetauscher Druckverluste im Bereich dieser Wärmetauscher in Kauf genommen werden, die einen erhöhten Energieverbrauch zur Folge haben. Ein derartiger Energieverbrauch tritt auch dann auf, wenn die Wiederaufheizung der Reingase vor der Einleitung in den Kamin durch rekuperative Wärmetauscher erfolgt, beispielsweise durch dampfbeheizte Wärmetauscher oder Wärmeverschiebungssysteme.In addition to the disadvantages of the emission of sulfuric acid, hydrogen fluoride and strongly corrosive coarse particles described above, pressure losses in the area of these heat exchangers must be accepted when the pure gases are re-heated by regenerative heat exchangers, which result in increased energy consumption. Such energy consumption also occurs when the pure gases are reheated before being introduced into the chimney by recuperative heat exchangers, for example by steam-heated heat exchangers or heat displacement systems.
Eine solche Schaltungsanordnung, bei der die Reingase über einen rekuperativen Gasvorwärmer wieder aufgeheizt werden, ist beispielsweise aus der Zeitschrift Brennstoff-Wärme-Kraft, Band 36 Nr. 10, Oktober 1984, Seiten 427 bis 431 bekannt. Diese Druckschrift offenbart, daß anstelle der Verwendung eines herkömmlichen Rohgasgebläses vor einer regenerativen Gasvorwärmung ein Reingasgebläse zwischen dem Wäscher einer RauchgasEntschwefelungsanlage und dem Gasvorwärmer angeordnet werden kann. Neben der Aufheizung des Reingases in dem regenerativen Gasvorwärmer erfolgt eine Temperaturerhöhung des Reingases aufgrund der Kompressionsarbeit des Ventilators. Diese Anordnung weist jedoch die voranstehend beschriebenen Nachteile der Wiederaufheizung der Reingase durch regenerative Wärmetauscher auf, nämlich Druckverluste im Bereich der Wärmetauscher sowie starke Korrosionsgefahr der Wärmeübertragungsflächen.Such a circuit arrangement, in which the clean gases are heated again via a recuperative gas preheater, is known, for example, from the journal Fuel-Heat-Power, Volume 36 No. 10, October 1984, pages 427 to 431. This document discloses that instead of using a conventional raw gas blower before a regenerative gas preheating, a clean gas blower can be arranged between the scrubber of a flue gas desulfurization system and the gas preheater. In addition to the heating of the clean gas in the regenerative gas preheater, the temperature of the clean gas increases due to the compression work of the fan. However, this arrangement has the disadvantages described above of the reheating of the clean gases by means of regenerative heat exchangers, namely pressure losses in the area of the heat exchangers and a strong risk of corrosion of the heat transfer surfaces.
Um auf die Verwendung derartiger, mit den geschilderten Nachteilen behafteter Wärmetauscher verzichten zu können, wurde bereits vorgeschlagen, die Reingase ohne Wiederaufheizung mit einer derart weitgehenden Untersättigung in den Kamin einzuleiten, daß Wasserdampfkondensation im Kamin zumindest im stationären Betrieb des Kraftwerks bei nicht zu stark abgesenkter Leistung vermieden wird. Hierbei wird die Kamininnenwand vor dem Anfahren aufgeheizt, vorzugsweise mittels eines Rezirkulationsgebläses und eines Wärmetauschers, der nur temporär vor und/oder während des Anfahrens der Feuerung und ggf. in sonstigen kritischen Betriebsphasen, nicht aber während des regulären Betriebes in den Reingaskanal eingefahren, während des Normalbetriebes jedoch aus dem Reingaskanal entfernt wird.In order to be able to dispense with the use of such heat exchangers, which have the disadvantages described, it has already been proposed to introduce the clean gases into the chimney without re-heating with such extensive saturation that water vapor condensation in the chimney, at least in stationary operation of the power plant, with the power not reduced too much is avoided. Here, the inside wall of the chimney is heated up, preferably by means of a recirculation fan and a heat exchanger, which is only moved temporarily into the clean gas duct before and / or during the start-up of the furnace and possibly in other critical operating phases, but not during normal operation Normal operation is removed from the clean gas channel.
Dieser bisher in der Praxis nicht erprobte Vorschlag, der zusätzlich die Anordnung einer Klappe gegen Kaltlufteinbrüche an der Kaminmündung erfordert, benötigt nicht nur einen gewissen Bau- und Steuerungsaufwand, sondern kann auch zu kritischen Phasen während des regulären Kraftwerksbetriebes führen, insbesondere wenn das Kraftwerk mit geringer Leistung betrieben wird.This proposal, which has not yet been tried and tested in practice and which additionally requires the arrangement of a flap against cold air inlets at the chimney mouth, not only requires a certain amount of construction and control effort, but can also lead to critical phases during regular power plant operation, in particular if the power plant is operated with low power.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Ableitung von Reingasen der eingangs beschriebenen Art zu schaffen, das einerseits die voranstehend geschilderten Nachteile bei einer Wiederaufheizung der Reingase durch regenerative oder rekuperative Wärmetauscher vermeidet und andererseits keine anderen Emissionen oder höhere Immissionen verursacht.The invention has for its object to provide a method for discharging clean gases of the type described above, which on the one hand avoids the disadvantages described above when reheating the clean gases by regenerative or recuperative heat exchangers and on the other hand does not cause other emissions or higher immissions.
Die Lösung dieser Aufgabenstellung durch die Erfindung ist dadurch gekennzeichnet, daß während des Betriebes die Aufheizung der Reingase durch Ausnutzung der polytropen Verdichtungsarbeit des zwischen der Rauchgasentschwefelungsanlage und dem Kamin angeordneten Saugzuggebläses erfolgt, daß während des Betriebs die Wandung des Reingaskanals zwischen Gebläseaustritt und Kaminaustritt auf eine oberhalb der Reingastemperatur liegende Temperatur aufgeheizt wird und daß nur während der Anfahrzeiten und sonstiger Phasen mit erhöhtem Feuchtigkeitsanfall eine Zusatzbeheizung der Reingase vor dem Eintritt in den Kamin erfolgt. Die Reingaskanalwandung kann gemäß einem weiteren Merkmal der Erfindung elektrisch beheizt werden.The solution to this problem by the invention is characterized in that during operation the heating of the clean gases takes place by utilizing the polytropic compression work of the induced draft fan arranged between the flue gas desulfurization system and the chimney, that during operation the wall of the clean gas duct between the fan outlet and the chimney outlet is above the temperature of the clean gas is heated and that additional heating of the clean gases takes place only before the entry into the chimney during start-up times and other phases with increased moisture. The clean gas channel wall can be electrically heated according to a further feature of the invention.
Das erfindungsgemäße Verfahren hat den Vorteil, daß durch den Wegfall eines teueren und aufgrund auftretender Korrosion störanfälligen Wärmetauschers einerseits Anlage- sowie Wartungs- und Reparaturkosten verringert und andererseits durch den Wärmetauscher bedingte Druckverluste vermieden werden. Durch den Entfall eines regenerativen Wärmetauschers wird auch die Gefahr der Emission von Schwefelsäure, Fluorwasserstoff und stark korrosiven Grobpartikeln vermieden. Da das Saugzuggebläse für die Ableitung der Rauchgase in jedem Fall vorhanden sein muß, erfordert das erfindungsgemäße Verfahren nicht den Einsatz eines zusätzlichen Bauteils, sondern lediglich dessen Anordnung hinter der Rauchgasentschwefelungsanlage und die Auslegung als sogenanntes nasses Gebläse. Die nur während der Anfahrzeiten und sonstiger Phasen mit erhöhtem Feuchtigkeitsanfall erfindungsgemäß durchzuführende Zusatzbeheizung der Reingase kann mit Hilfe eines verhältnismäßig kleinen Wärmetauschers beliebiger Bauart erfolgen, beispielsweise einem dampfbeheizten Luftvorwärmer, so daß der hierfür erforderliche bauliche und Energie-Aufwand geringgehalten werden kann. Die schließlich sowohl während der An- und Abfahrzeiten als auch während des normalen Betriebes erfindungsgemäß erfolgende Beheizung der Reingaskanalwandung zwischen Gebläseaustritt und Kaminaustritt erfordert im Verhältnis zu dem entfallenden Wärmetauscher nur einen geringen Bauaufwand, insbesondere wenn eine elektrische Heizung eingesetzt wird. Außerdem ist die Heizleistung gering. Sie beträgt beispielsweise bei einem 120 m hohen Kamin für ein Kraftwerk mit 500 MW elektrischer Leistung lediglich 300 kW.The process according to the invention has the advantage that the elimination of an expensive heat exchanger, which is susceptible to failure due to corrosion, on the one hand reduces system and maintenance and repair costs, and on the other hand avoids pressure losses caused by the heat exchanger. Eliminating a regenerative heat exchanger also avoids the risk of sulfuric acid, hydrogen fluoride and highly corrosive coarse particles being emitted. Since the induced draft fan must be available for the discharge of the flue gases in any case, required the method according to the invention does not involve the use of an additional component, but merely its arrangement behind the flue gas desulfurization system and the design as a so-called wet fan. The additional heating of the pure gases to be carried out according to the invention only during the start-up times and other phases with increased moisture accumulation can be carried out with the aid of a relatively small heat exchanger of any type, for example a steam-heated air preheater, so that the structural and energy expenditure required for this can be kept low. The heating of the clean gas duct wall between the fan outlet and the chimney outlet, which takes place according to the invention both during the start-up and shutdown times and during normal operation, requires only a small amount of construction in relation to the heat exchanger which is omitted, in particular if an electric heater is used. The heating output is also low. For example, in a 120 m chimney for a power plant with 500 MW electrical output, it is only 300 kW.
Insgesamt wird mit der Erfindung ein Verfahren zur Ableitung von durch katalytische Entstickung, Entstaubung und Naßentschwefelung gereinigten Rauchgasen in die Atmosphäre geschaffen, das trotz Vermeidung der eingangs geschilderten Nachteile der bekannten Verfahren gegenüber diesen Verfahren mit einem geringeren apparativen Aufwand und einem niedrigeren Energieverbrauch auskommt.Overall, the invention provides a method for discharging flue gases cleaned by catalytic denitrification, dedusting and wet desulfurization into the atmosphere which, despite avoiding the disadvantages of the known methods described at the outset compared to these methods, requires less equipment and less energy consumption.
Auf der Zeichnung sind zwei Ausführungsbeispiele eines Kraftwerkes zur Durchführung des erfindungsgemäßen Verfahrens dargestellt, und zwar zeigt:
- Fig. 1
- ein Schaltschema eines Kraftwerkes mit Ableitung der Reingase durch einen Kamin und
- Fig. 2
- ein Schaltschema eines Kraftwerkes mit Ableitung der Reingase durch einen Kühlturm mit zusätzlicher Angabe des Temperatur- und Druckverlaufs.
- Fig. 1
- a circuit diagram of a power plant with discharge of the clean gases through a chimney and
- Fig. 2
- a circuit diagram of a power plant with discharge of the clean gases through a cooling tower with additional indication of the temperature and pressure curve.
Das Schaltschema gemäß Fig. 1 zeigt einen Dampferzeuger 1, dem Brennstoff und über einen Luftvorwärmer 2 erwärmte Verbrennungsluft zugeführt wird und dessen durch einen Pfeil angedeutete Rauchgase als erstes einer katalytischen Entstickungsanlage 3 zugeführt werden. Die mit SO3 und HF beladenen Rauchgase geben im Luftvorwärmer 2 einen Teil ihrer Wärme an die Verbrennungsluft ab und werden anschließend in einem Elektrofilter 4 entstaubt. Ublicherweise erfolgt in der Entstickungsanlage 3 eine NOx-Minderung auf 200 mg/m3; im Elektrofilter erfolgt eine Entstaubung auf etwa 50 mg/m3.1 shows a steam generator 1, to which fuel and combustion air heated via an
Das entstickte und entstaubte Rauchgas wird anschließend einer Rauchgasentschwefelungsanlage 5 zugeführt, in der das Rauchgas durch Zugabe von Kalkmilch und Trägerluft im Naßverfahren auf etwa 400 mg/m3 entschwefelt wird. Der in der Rauchgasentschwefelungsanlage 5 anfallende Gips wird abgezogen.The denitrified and dedusted flue gas is then fed to a flue
Das durch katalytische Entstickung, Entstaubung und Naßentschwefelung gereinigte Rauchgas (Reingas) wird aus der Rauchgasentschwefelungsanlage 5 durch ein Saugzuggebläse 6 angesaugt und dem nachgeschalteten Kamin 7 zugeführt. Der zwischen dem Austritt aus dem Saugzuggebläse 6 und der Mündung des Kamins 7 verlaufende Reingaskanal 8 ist mit einer elektrischen Heizung 9 und außerdem mit einer Wärmedämmung 10 versehen.The flue gas (clean gas) cleaned by catalytic denitrification, dust removal and wet desulfurization is sucked out of the flue
Das Saugzuggebläse 6 ist derart ausgelegt, daß aufgrund der polytropen Verdichtungsarbeit des Saugzuggebläses 6 die Reingase aufgeheizt werden. Da diese im Normalbetrieb des Kraftwerks, d.h. bei laufendem Saugzuggebläse 6 erfolgende Aufheizung nicht ausreicht, das Reingas insgesamt zu trocknen, wird der Reingaskanal 8 zur Vermeidung einer Kondensation auf eine oberhalb der Reingastemperatur liegende Temperatur aufgeheizt, beispielsweise durch eine in Fig. 1 gestrichelt dargestellte Zusatzheizung 11. Hierbei kann es zweckmäßig sein, den Reingaskanal 8 zusätzlich mit einer korrosionsfesten Beschichtung zu versehen, beispielsweise durch Verwenden einer Brombotylfolie.The induced
Bei dem in Fig. 2 dargestellten Kraftwerk, das ansonsten dem Aufbau gemäß Fig. 1 entspricht, erfolgt die Ableitung der Reingase durch einen Kühlturm 7a. Unterhalb der schematischen Darstellung des Kraftwerkes sind in einem Diagramm der Temperatur- und Druckverlauf aufgetragen. Das Diagramm läßt erkennen, daß auch ohne Betrieb der gestrichelt eingezeichneten Zusatzheizung 11 durch das Saugzuggebläse 6 eine Temperaturerhöhung der Reingase von 48° C auf 53° C bewirkt wird. Da die Reingase durch einen durch Wärmeaustausch aufgeheizten Kühlturm 7a in die Atmosphäre abgeleitet werden, kann auf eine zusätzliche Aufheizung der Reingase im Kühlturm 7a und auch auf eine Zusatzheizung 11 verzichtet werden, wenn die Reingasleitung zwischen Gebläseaustritt und Eintritt in den Kühlturm nicht zu lang ist.In the power plant shown in FIG. 2, which otherwise corresponds to the structure according to FIG. 1, the clean gases are discharged through a
- 11
- DampferzeugerSteam generator
- 22nd
- LuftvorwärmerAir preheater
- 33rd
- EntstickungsanlageDenitrification plant
- 44th
- ElektrofilterElectrostatic precipitator
- 55
- RauchgasentschwefelungsanlageFlue gas desulfurization plant
- 66
- SaugzuggebläseInduced draft fan
- 77
- Kaminstack
- 7a7a
- KühlturmCooling tower
- 88th
- RauchgaskanalFlue gas duct
- 99
- Heizungheater
- 1010th
- WärmedämmungThermal insulation
- 1111
- ZusatzheizungAdditional heating
Claims (2)
- Method of discharging flue gases (clean gases), cleaned by catalytic removal of nitrogen oxides, removal of dust and wet desulphurization, of a firing plant, in particular a power station operated with fossil fuel, into the atmosphere, in which, after emerging from the flue-gas desulphurization plant (5), the clean gases, which are saturated with water vapour, are fed to the chimney by an induced-draught fan (6) and heated before entry to the chimney, the heating of the clean gases during operation being accomplished by utilising the polytropic work of compression of the induced-draught fan (6) arranged between the flue-gas desulphurization plant (5) and the chimney (7), and the wall of the clean-gas duct (8) between the fan outlet and the chimney outlet being heated during operation to a temperature above the clean-gas temperature, and additional heating of the clean gases before entry to the chimney (7) being performed only during the start-up times and other phases with an increased incidence of moisture.
- Method according to Claim 1, characterized in that the wall of the clean-gas duct is heated electrically.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4300431A DE4300431C1 (en) | 1993-01-09 | 1993-01-09 | Process for discharging cleaned flue gases |
| DE4300431 | 1993-01-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0606630A1 EP0606630A1 (en) | 1994-07-20 |
| EP0606630B1 true EP0606630B1 (en) | 1996-10-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93120660A Expired - Lifetime EP0606630B1 (en) | 1993-01-09 | 1993-12-22 | Method of discharging purified flue gases |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0606630B1 (en) |
| AT (1) | ATE144823T1 (en) |
| DE (2) | DE4300431C1 (en) |
| DK (1) | DK0606630T3 (en) |
| ES (1) | ES2094994T3 (en) |
| GR (1) | GR3021734T3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2738501A1 (en) * | 1977-08-26 | 1979-03-08 | Saarberg Hoelter | Power station cooling tower - with waste gas purification section within the tower |
| SE452413B (en) * | 1984-12-04 | 1987-11-30 | Flaekt Ab | MEDIUM MIXING NOZE, INTENDED TO BE USED IN A CONTACT REACTOR |
| DE4000654A1 (en) * | 1990-01-11 | 1991-07-25 | Schmitz Tona Tonwerke | METHOD FOR LINING A CHIMNEY AND CUFF TO CONNECT THE PIPE SECTIONS OF AN INNER PIPE THEREFOR |
| DE4008617A1 (en) * | 1990-03-17 | 1991-09-19 | Kraftanlagen Ag | Exhaust gas layout from e.g. boiler plant - has wet desulphurisation, heat exchangers, solids filters and heat carrier so that system prevents corrosion of pressurising fans |
| DE4124489A1 (en) * | 1991-07-24 | 1993-01-28 | Flachglas Consult Gmbh | INDUSTRIAL CHIMNEY WITH ACID PROTECTION DEVICE |
| DE4130763A1 (en) * | 1991-09-16 | 1993-03-18 | Wurz Dieter | Discharging purified smoke gas from boiler furnace of power station - comprises reheating gases, temporarily before and/or during firing and during critical operational phases, but not during steady operation |
-
1993
- 1993-01-09 DE DE4300431A patent/DE4300431C1/en not_active Expired - Fee Related
- 1993-12-22 ES ES93120660T patent/ES2094994T3/en not_active Expired - Lifetime
- 1993-12-22 DE DE59304358T patent/DE59304358D1/en not_active Expired - Fee Related
- 1993-12-22 DK DK93120660.1T patent/DK0606630T3/en active
- 1993-12-22 EP EP93120660A patent/EP0606630B1/en not_active Expired - Lifetime
- 1993-12-22 AT AT93120660T patent/ATE144823T1/en not_active IP Right Cessation
-
1996
- 1996-11-20 GR GR960403130T patent/GR3021734T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE144823T1 (en) | 1996-11-15 |
| EP0606630A1 (en) | 1994-07-20 |
| DK0606630T3 (en) | 1997-04-14 |
| GR3021734T3 (en) | 1997-02-28 |
| DE59304358D1 (en) | 1996-12-05 |
| ES2094994T3 (en) | 1997-02-01 |
| DE4300431C1 (en) | 1994-06-30 |
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