EP1116862A2 - Steam generating method and plant - Google Patents

Steam generating method and plant Download PDF

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Publication number
EP1116862A2
EP1116862A2 EP00126349A EP00126349A EP1116862A2 EP 1116862 A2 EP1116862 A2 EP 1116862A2 EP 00126349 A EP00126349 A EP 00126349A EP 00126349 A EP00126349 A EP 00126349A EP 1116862 A2 EP1116862 A2 EP 1116862A2
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EP
European Patent Office
Prior art keywords
steam generator
feed water
waste heat
steam
heat boiler
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Granted
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EP00126349A
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German (de)
French (fr)
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EP1116862B1 (en
EP1116862A3 (en
Inventor
Bernd Gericke
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MAN Energy Solutions SE
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MAN Turbomaschinen AG GHH Borsig
MAN Turbomaschinen AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/183—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines in combination with metallurgical converter installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
    • F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
    • F01K3/185—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using waste heat from outside the plant

Definitions

  • the invention relates to a method for generating steam in a steam generator system with a gas fired with blast furnace gas Steam generator and a steam generator system.
  • the invention is based on the object of the generic type Developing processes in such a way that they are based on support firing with noble fuels in the combustion of the blast furnace gas in Continuous operation can be dispensed with.
  • Waste heat is generated in sinter cooling systems in metallurgical plants, in which at the same time top gas as waste gas from the blast furnace process is produced. From the sintered fine ores to the cooling air emitted heat is over according to the invention Heat exchanger surfaces in the waste heat boiler by Heat transfer system in the high pressure system of the steam generator coupled. So that waste heat with different and especially low temperature level and waste gas with fluctuating and in particular low calorific value for generation exploited by steam.
  • the heat utilization in the area of the sinter cooling systems is designed due to the special temperature and Cooling air quantity ratios are particularly complex.
  • Cooling air is extracted from heat, making heat sources different Temperature levels arise.
  • a special waste heat boiler concept is required.
  • the most interesting part of the waste heat from the Sinter cooling system only makes up a small percentage of the total amount of cooling air. While this is proportionate low cooling air mass flow thanks to its higher gas temperature lends itself particularly to high feed water preheating the larger cooling air mass flow with low temperature remaining feed water preheating used.
  • the temperature of the feed water is checked before entering the Heat exchanger surfaces of the waste heat boiler on the physical lowest possible value lowered. It is advantageous if the feed water through the heat exchange with the recycled steam turbine condensate is cooled. The on this way, lowered temperature of the feed water also allows extract heat from the low-temperature sintered cooling air.
  • the heat transfer system consists of two external ones additional preheaters, some of which is the waste heat Add top gas to all combustion air and fuel. This increases the calorific value of the blast furnace gas to such an extent that in normal operation no support fire over high calorific Noble fuels like natural gas is necessary.
  • FIG. 1 An embodiment of the invention is in the drawing shown and is explained in more detail below.
  • the drawing shows a process scheme for generating steam.
  • a steam generator 1 which works according to the natural circulation principle contains a combustion chamber 2, the one from top to bottom flowed flue gas duct 3 is connected. By doing Flue gas duct 3 are secondary heating surfaces like superheater 4 and the convection evaporator 4a. Instead of one Maturum steam generator can also be a forced circulation or a Forced-flow steam generators are used. It can also another than the flue gas duct shown, e.g. B. according to Art a tower boiler can be used.
  • the steam generator 1 is fired with blast furnace gas.
  • the combustion chamber 2 is shown on the front side with only schematically Provide burners 5.
  • the burners 5 have an air line 6 for supplying combustion air and with a top gas line 7 connected to the supply of blast furnace gas.
  • This emergency fuel is fed to the burners 5 via a gas line 8.
  • a steam line 9 is connected to the superheater 4 of the steam generator 1 connected, which is guided to a steam turbine 10.
  • the Steam turbine 10 has a generator 11 for generating electricity coupled.
  • the steam turbine 10 can be regulated Withdrawal 12 process steam can be extracted into a steam network is fed.
  • the outlet of the steam turbine 10 is connected to an exhaust steam line 13 connected, which is led to a capacitor 14.
  • Condenser 14 the exhaust steam is condensed, and that Steam turbine condensate is in via a condensate line 15 a feed pump 16 is arranged to a degasser 17 promoted.
  • the degasser 17 is operated with bleed steam is removed from the steam turbine 10 via a bleed line 18.
  • a feed water line 19 is connected to the degasser 17 connected in which a feed water pump 20 is arranged, which the pressure of the feed water to the process pressure of the Steam generator 1 increased.
  • the feed water line 19 is between the degasser 17 and the feed water pump 20 Water / water heat exchanger 21 arranged, the at the same time the condensate line 15 is connected.
  • the feed water line 19 is connected in parallel Heat exchanger surfaces 22 performed in a waste heat boiler 23rd are arranged. Downstream from the heat exchanger surfaces 22 is the feed water line 19 with an external air preheater 24, to which the air line 6 is connected, and in parallel for this purpose with a gas preheater 25 to which the top gas line 7 connected, connected. Following the air preheater 24 and the gas preheater 25 is the feed water line 19 a feed water preheater 26 led by the flue gas is flowed through, which leaves the steam generator 1. This Feed water preheater 26 is on the water side with the water-steam cycle of the steam generator 1 connected.
  • the waste heat boiler 23 is a sintering system for sintering Subsequent fine ores on a sintered belt.
  • the Sintering process becomes air that rests on the sintering belt Layer of the sintered mixture or the sinter supplied. Through the Air becomes the sintering process through the combustion of the Maintain sintered mixture of mixed fine coal.
  • To Sintering is carried out by additional fans with cooling air pressed or sucked the sinter. This way it falls lengthways of the sintered cooling belt SK1 in the gas flue 30 with exhaust air different temperatures and in different amounts or, as shown in the throttle cable 31, cooling air with a corresponding mixing temperature on the sintered cooling belt SK2.
  • the waste heat boiler 23 is divided into two and has two throttle cables 30, 31.
  • the heat exchanger surfaces 22 are distributed to these two throttle cables 30, 31.
  • the throttle cables 30, 31 des Waste heat boilers 23 are with connecting pieces for the different exhaust gas flows 27, 28, 29 provided.
  • Both sinter cooling systems SK1 and SK2 can be used to the heat extraction described above also in series be switched.
  • the feed water is before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 on the physically lowest possible temperature cooled. Consists due to the composition of the waste heat boiler 23 exhaust gases flowing through there is no risk that a Below the dew point, the corrosion damage to the Heat exchanger surfaces causes, as described, that Feed water through before entering the heat exchanger surfaces Steam turbine condensate cooled. This usually happens Waste heat boilers in which exhaust air from sintered cooling belts is cooled becomes. However, corrosion damage must be expected, so the temperature of the feed water must be before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 approximately Temperature of the degasser 17 correspond.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Thermal Sciences (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Physical Water Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Air Supply (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The method involves pre-heating the degassed and high pressure supply water for the steam generator (1) in an independent heating boiler (23) by the exchange of heat with waste air and pre-heating the waste gas and the combustion gas fed to the steam generator by exchanging heat with the pre-heated supply water in external pre-heaters (24,25). Independent claims are also included for the following: a steam generating system.

Description

Die Erfindung betrifft ein Verfahren zur Erzeugung von Dampf in einer Dampferzeugeranlage mit einem mit Gichtgas gefeuerten Dampferzeuger und eine Dampferzeugeranlage.The invention relates to a method for generating steam in a steam generator system with a gas fired with blast furnace gas Steam generator and a steam generator system.

In Hüttenwerken fallen prozessbedingte Abfallgase wie Gicht-, Koksofen- und Konvertergas an. Es besteht Interesse daran, diese Abfallgase in effizienter Weise zur Stromerzeugung auszunutzen. Wegen der erhöhten Investitionen und wegen des technischen Risikos, diese Abfallgase in Gasturbinen für Kombiprozessen einzusetzen, werden konventionelle Lösungen mit Hochdruckdampferzeugern angestrebt. Bei den prozessbedingt starken Heizwertschwankungen, z. B. des Gichtgases muss bei der Verstromung zur Stabilisierung der Verbrennung im Dampferzeuger Erdgas und Heizöl als Stützfeuer eingesetzt werden.Process-related waste gases such as gout, Coke oven and converter gas. There is interest in this Use waste gases efficiently to generate electricity. Because of the increased investment and because of the technical Risks, these waste gases in gas turbines for combined processes conventional solutions with High pressure steam generators aimed. With the process-related strong fluctuations in calorific value, e.g. B. the top gas must be at the Electricity generation to stabilize the combustion in the steam generator Natural gas and heating oil can be used as support fires.

Der Erfindung liegt die Aufgabe zu Grunde, das gattungsgemäße Verfahren derart weiterzuentwickeln, dass auf eine Stützfeuerung mit Edelbrennstoffen bei der Verbrennung des Gichtgases im Dauerbetrieb verzichtet werden kann.The invention is based on the object of the generic type Developing processes in such a way that they are based on support firing with noble fuels in the combustion of the blast furnace gas in Continuous operation can be dispensed with.

Diese Aufgabe wird bei einem gattungsgemäßen Verfahren erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Eine Dampferzeugeranlage zur Durchführung des Verfahrens ist Gegenstand des Anspruches 5. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This task is carried out in a generic method according to the invention by the characterizing features of Claim 1 solved. A steam generator plant to carry out the method is the subject of claim 5. Advantageous Embodiments of the invention are in the subclaims specified.

Durch die Einkopplung von Abwärme in den Verbrennungsprozess kann auch bei abgesenkten Heizwerten im Gichtgas auf Edelbrennstoffe als Stützfeuer verzichtet werden. Derartige Abwärme fällt in Sinterkühlanlagen von Hüttenwerken an, in denen zeitgleich auch Gichtgas als Abfallgas aus dem Hochofenprozess erzeugt wird. Die von den gesinterten Feinerzen an die Kühlluft abgegebene Wärme wird gemäß der Erfindung über Wärmetauscherflächen im Abhitzekessel durch ein Wärmeverschiebesystem in das Hochdrucksystem des Dampferzeugers eingekoppelt. Damit wird Abfallwärme mit unterschiedlichem und insbesondere niedrigem Temperaturniveau und Abfallgas mit schwankendem und insbesondere geringem Heizwert zur Erzeugung von Dampf ausgenutzt.By coupling waste heat into the combustion process can also occur in the blast furnace gas when the calorific values are lowered Noble fuels can be dispensed with as support fires. Such Waste heat is generated in sinter cooling systems in metallurgical plants, in which at the same time top gas as waste gas from the blast furnace process is produced. From the sintered fine ores to the cooling air emitted heat is over according to the invention Heat exchanger surfaces in the waste heat boiler by Heat transfer system in the high pressure system of the steam generator coupled. So that waste heat with different and especially low temperature level and waste gas with fluctuating and in particular low calorific value for generation exploited by steam.

Die Wärmeausnutzung im Bereich der Sinterkühlanlagen gestaltet sich auf Grund der besonderen Temperatur- und Kühlluftmengenverhältnisse besonders vielschichtig. Längs des Sinterbandes wird an verschiedenen Stellen dem Sintergut über Kühlluft Wärme entzogen, wodurch Wärmequellen unterschiedlichen Temperturniveaus entstehen. Um einen entsprechend hohen Anteil des unterschiedlichen Wärmepotentials sinnvoll ausnutzen zu können, bedarf es eines besonderen Abhitzekesselkonzeptes. Der exergetisch interessanteste Teil der Abwärmemenge aus der Sinterkühlanlage macht nur einen geringen Prozentsatz der gesamten Kühlluftmenge aus. Während dieser verhältnismäßig geringe Kühlluftmassenstrom dank seiner höheren Gastemperatur sich besonders zur hohen Speisewasservorwärmung anbietet, wird der größere Kühlluftmassenstrom mit niedriger Temperatur zur restlichen Speisewasservorwärmung genutzt. Um zusätzliche Temperatursträhnen auf der Kühlluftseite zu vermeiden, werden beide Kühlluftströme erst in der Mitte des zweigeteilten Abhitzekessels bei nahezu gleichem Temperaturniveau zusammengeführt.The heat utilization in the area of the sinter cooling systems is designed due to the special temperature and Cooling air quantity ratios are particularly complex. Along the Sintering tape is over the sintered material at various points Cooling air is extracted from heat, making heat sources different Temperature levels arise. By a correspondingly high proportion to make good use of the different heat potential a special waste heat boiler concept is required. The most interesting part of the waste heat from the Sinter cooling system only makes up a small percentage of the total amount of cooling air. While this is proportionate low cooling air mass flow thanks to its higher gas temperature lends itself particularly to high feed water preheating the larger cooling air mass flow with low temperature remaining feed water preheating used. For additional Avoid temperature streaks on the cooling air side both cooling air flows only in the middle of the two-part Waste heat boiler at almost the same temperature level merged.

Dabei ermöglicht die Absenkung der Temperatur des entgasten Speisewassers durch den Wärmetausch mit dem zurückgeführten Dampfturbinenkondensat die Einkopplung von Abwärme von niedrigem Temperaturniveau.This allows the temperature of the degassed to be lowered Feed water through the heat exchange with the returned Steam turbine condensate the coupling of waste heat from low Temperature level.

Die Temperatur des Speisewassers wird vor dem Eintritt in die Wärmetauscherflächen des Abhitzekessels auf den physikalisch niedrigstmöglichen Wert abgesenkt. Vorteilhaft ist es dabei, wenn das Speisewasser durch den Wärmetausch mit dem zurückgeführten Dampfturbinenkondensat gekühlt wird. Die auf diese Weise abgesenkte Temperatur des Speisewassers erlaubt auch aus der niedertemperaturigen Sinterkühlluft Wärme auszukoppeln.The temperature of the feed water is checked before entering the Heat exchanger surfaces of the waste heat boiler on the physical lowest possible value lowered. It is advantageous if the feed water through the heat exchange with the recycled steam turbine condensate is cooled. The on this way, lowered temperature of the feed water also allows extract heat from the low-temperature sintered cooling air.

Das Wärmeverschiebesystem besteht aus zwei außen liegenden zusätzlichen Vorwärmern, welche die Abwärme teilweise der gesamten Verbrennungsluft und dem Brennstoff Gichtgas zuführen. Hierdurch wird der Heizwert des Gichtgases so weit erhöht, dass im Normalbetrieb kein Stützfeuer über hochkalorige Edelbrennstoffe wie Erdgas notwendig ist.The heat transfer system consists of two external ones additional preheaters, some of which is the waste heat Add top gas to all combustion air and fuel. This increases the calorific value of the blast furnace gas to such an extent that in normal operation no support fire over high calorific Noble fuels like natural gas is necessary.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher erläutert. Die Zeichnung zeigt ein Verfahrensschema zur Erzeugung von Dampf.An embodiment of the invention is in the drawing shown and is explained in more detail below. The drawing shows a process scheme for generating steam.

Ein nach dem Naturumlaufprinzip arbeitender Dampferzeuger 1 enthält eine Brennkammer 2, der ein von oben nach unten durchströmter Rauchgaszug 3 nachgeschaltet ist. In dem Rauchgaszug 3 sind Nachschaltheizflächen wie der Überhitzer 4 und der Konvektionsverdampfer 4a angeordnet. Anstelle eines Maturumlaufdampferzeugers kann auch ein Zwangsumlauf- oder ein Zwangsdurchlaufdampferzeuger eingesetzt werden. Es kann auch eine andere als die dargestellte Rauchgasführung, z. B. nach Art eines Turmkessels verwendet werden.A steam generator 1 which works according to the natural circulation principle contains a combustion chamber 2, the one from top to bottom flowed flue gas duct 3 is connected. By doing Flue gas duct 3 are secondary heating surfaces like superheater 4 and the convection evaporator 4a. Instead of one Maturum steam generator can also be a forced circulation or a Forced-flow steam generators are used. It can also another than the flue gas duct shown, e.g. B. according to Art a tower boiler can be used.

Der Dampferzeuger 1 wird mit Gichtgas befeuert. Die Brennkammer 2 ist an der Stirnseite mit nur schematisch dargestellten Brennern 5 versehen. Die Brenner 5 sind mit einer Luftleitung 6 zur Zuführung von Verbrennungsluft und mit einer Gichtgasleitung 7 zur Zuführung von Gichtgas verbunden. Bei Störfällen und bei Ausfall des später beschriebenen Abhitzekessels 23 kann zur Absicherung der Dampfleistung Koksofengas oder Erdgas als Notfallbrennstoff eingesetzt werden. Dieser Notfallbrennstoff wird den Brennern 5 über eine Gasleitung 8 zugeführt.The steam generator 1 is fired with blast furnace gas. The combustion chamber 2 is shown on the front side with only schematically Provide burners 5. The burners 5 have an air line 6 for supplying combustion air and with a top gas line 7 connected to the supply of blast furnace gas. In the event of accidents and Failure of the waste heat boiler 23 described later can Safeguarding the steam output of coke oven gas or natural gas as Emergency fuel can be used. This emergency fuel is fed to the burners 5 via a gas line 8.

An den Überhitzer 4 des Dampferzeugers 1 ist eine Dampfleitung 9 angeschlossen, die zu einer Dampfturbine 10 geführt ist. Die Dampfturbine 10 ist mit einem Generator 11 zur Stromerzeugung gekopppelt. Der Dampfturbine 10 kann über eine geregelte Entnahme 12 Prozessdampf entnommen werden, der in ein Dampfnetz eingespeist wird.A steam line 9 is connected to the superheater 4 of the steam generator 1 connected, which is guided to a steam turbine 10. The Steam turbine 10 has a generator 11 for generating electricity coupled. The steam turbine 10 can be regulated Withdrawal 12 process steam can be extracted into a steam network is fed.

Der Ausgang der Dampfturbine 10 ist mit einer Abdampfleitung 13 verbunden, die zu einem Kondensator 14 geführt ist. In dem Kondensator 14 wird der Abdampf kondensiert, und das Dampfturbinenkondensat wird über eine Kondensatleitung 15, in der eine Förderpumpe 16 angeordnet ist, zu einem Entgaser 17 gefördert. Der Entgaser 17 wird mit Anzapfdampf betrieben, der über eine Anzapfleitung 18 der Dampfturbine 10 entnommen wird.The outlet of the steam turbine 10 is connected to an exhaust steam line 13 connected, which is led to a capacitor 14. By doing Condenser 14, the exhaust steam is condensed, and that Steam turbine condensate is in via a condensate line 15 a feed pump 16 is arranged to a degasser 17 promoted. The degasser 17 is operated with bleed steam is removed from the steam turbine 10 via a bleed line 18.

An den Entgaser 17 ist eine Speisewasserleitung 19 angeschlossen, in der eine Speisewasserpumpe 20 angeordnet ist, die den Druck des Speisewassers auf den Prozessdruck des Dampferzeugers 1 erhöht. In der Speisewasserleitung 19 ist zwischen dem Entgaser 17 und der Speisewasserpumpe 20 ein Wasser/Wasser-Wärmetauscher 21 angeordnet, der gleichzeitig an die Kondensatleitung 15 angeschlossen ist.A feed water line 19 is connected to the degasser 17 connected in which a feed water pump 20 is arranged, which the pressure of the feed water to the process pressure of the Steam generator 1 increased. In the feed water line 19 is between the degasser 17 and the feed water pump 20 Water / water heat exchanger 21 arranged, the at the same time the condensate line 15 is connected.

Die Speisewasserleitung 19 ist zu parallel geschalteten Wärmetauscherflächen 22 geführt, die in einem Abhitzekessel 23 angeordnet sind. Stromabwärts von den Wärmetauscherflächen 22 ist die Speisewasserleitung 19 mit einem externen Luftvorwärmer 24, an den die Luftleitung 6 angeschlossen ist, und parallel dazu mit einem Gasvorwärmer 25, an den die Gichtgasleitung 7 angeschlossen ist, verbunden. Im Anschluss an den Luftvorwärmer 24 und den Gasvorwärmer 25 ist die Speisewasserleitung 19 zu einem Speisewasservorwärmer 26 geführt, der von dem Rauchgas durchströmt ist, das den Dampferzeuger 1 verlässt. Dieser Speisewasservorwärmer 26 ist wasserseitig mit dem Wasser-Dampf-Kreislauf des Dampferzeugers 1 verbunden.The feed water line 19 is connected in parallel Heat exchanger surfaces 22 performed in a waste heat boiler 23rd are arranged. Downstream from the heat exchanger surfaces 22 is the feed water line 19 with an external air preheater 24, to which the air line 6 is connected, and in parallel for this purpose with a gas preheater 25 to which the top gas line 7 connected, connected. Following the air preheater 24 and the gas preheater 25 is the feed water line 19 a feed water preheater 26 led by the flue gas is flowed through, which leaves the steam generator 1. This Feed water preheater 26 is on the water side with the water-steam cycle of the steam generator 1 connected.

Der Abhitzekessel 23 ist einer Sinteranlage zur Sinterung von Feinerzen auf einem Sinterband nachgeschaltet. Während des Sinterprozesses wird Luft der auf dem Sinterband ruhenden Schicht der Sintermischung bzw. des Sinters zugeführt. Durch die Luft wird der Sinterprozess durch die Verbrennung der der Sintermischung beigemischten Feinkohle aufrechterhalten. Nach erfolgter Sinterung wird über zusätzliche Gebläse Kühlluft durch den Sinter gedrückt oder gesaugt. Auf diese Weise fällt längs des Sinterkühlbandes SK1 im Gaszug 30 Abluft mit unterschiedlichen Temperaturen und in unterschiedlichen Mengen oder aber, wie im Gaszug 31 dargestellt, Kühlluft mit einer entsprechenden Mischtemperatur beim Sinterkühlbandes SK2 an. Um diese verschiedenen Abluftströme 27, 28, 29 in dem Abhitzekessel 23 ausnutzen zu können, ist der Abhitzekessel 23 zweigeteilt und weist zwei Gaszüge 30, 31 auf. Die Wärmetauscherflächen 22 sind auf diese beiden Gaszüge 30, 31 verteilt. Die Gaszüge 30, 31 des Abhitzekessels 23 sind mit Anschlussstutzen für die unterschiedlichen Abgasströme 27, 28, 29 versehen. Der Abgasstrom 29, der eine niedrigere Temperatur aufweist als der Abgasstrom 28 wird in den Abhitzekessel 23 an einer Stelle eingespeist, an der der Abgasstrom 28 durch Abkühlung eine Temperatur angenommen hat, die etwa der des Abgasstromes 29 entspricht. Beide Sinterkühlanlagen SK1 und SK2 können in Bezug auf die oben beschriebene Wärmeauskopplung auch in Reihe geschaltet werden.The waste heat boiler 23 is a sintering system for sintering Subsequent fine ores on a sintered belt. During the Sintering process becomes air that rests on the sintering belt Layer of the sintered mixture or the sinter supplied. Through the Air becomes the sintering process through the combustion of the Maintain sintered mixture of mixed fine coal. To Sintering is carried out by additional fans with cooling air pressed or sucked the sinter. This way it falls lengthways of the sintered cooling belt SK1 in the gas flue 30 with exhaust air different temperatures and in different amounts or, as shown in the throttle cable 31, cooling air with a corresponding mixing temperature on the sintered cooling belt SK2. Around these different exhaust air flows 27, 28, 29 in the waste heat boiler To be able to use 23, the waste heat boiler 23 is divided into two and has two throttle cables 30, 31. The heat exchanger surfaces 22 are distributed to these two throttle cables 30, 31. The throttle cables 30, 31 des Waste heat boilers 23 are with connecting pieces for the different exhaust gas flows 27, 28, 29 provided. The Exhaust gas stream 29, which has a lower temperature than that Exhaust gas stream 28 enters the waste heat boiler 23 at one point fed in, at which the exhaust gas stream 28 by cooling a Has assumed temperature that approximately that of the exhaust gas stream 29th corresponds. Both sinter cooling systems SK1 and SK2 can be used to the heat extraction described above also in series be switched.

In dem Wasser/Wasser-Wärmetauscher 21 wird das entgaste Speisewasser aus dem Entgaser 17 im Wärmetausch mit dem Kondensat aus dem Kondensator 14 soweit wie möglich abgekühlt. Durch die Speisewasserpumpe 20 wird der Druck des gekühlten Speisewassers auf den Prozessdruck des Dampferzeugers 1 gebracht. In dem Abhitzekessel 23 wird die Temperatur des gekühlten und hochgespannten Speisewassers entsprechend erhöht. Mit dieser Temperatur tritt das Speisewasser in den Luftvorwärmer 24 und den Gasvorwärmer 25 ein, wodurch die Verbrennungsluft und das Gichtgas jeweils höchstmöglich vorgewärmt werden. Bei Eintritt in den Speisewasservorwärmer 26 weist das Speisewasser dann noch eine Temperatur von wenigen Kelvin oberhalb der Temperatur im Entgaser 17 auf. Die Werte können je nach den Gegebenheiten an den Sinterkühlanlagen SK1, SK2 und je nach den vorliegenden Dampfparametern stark variieren.This is degassed in the water / water heat exchanger 21 Feed water from the degasser 17 in heat exchange with the Condensate from the condenser 14 cooled as much as possible. Through the feed water pump 20, the pressure of the cooled Feed water to the process pressure of the steam generator 1 brought. In the waste heat boiler 23, the temperature of the cooled and high-tension feed water increased accordingly. At this temperature, the feed water enters the Air preheater 24 and the gas preheater 25, causing the Combustion air and the top gas each as high as possible be preheated. Upon entry into the feed water preheater 26 the feed water then still has a temperature of a few Kelvin above the temperature in the degasser 17. The values Depending on the conditions on the sinter cooling systems SK1, SK2 and strong depending on the steam parameters available vary.

Das Speisewasser wird vor dem Eintritt in die Wärmetauscherflächen 22 des Abhitzekessels 23 auf die physikalisch niedrigstmögliche Temperatur abgekühlt. Besteht aufgrund der Zusammensetzung der den Abhitzekessel 23 durchströmenden Abgase nicht die Gefahr, dass eine Taupunktunterschreitung auftritt, die Korrosionsschäden an den Wärmetauscherflächen verursacht, so wird, wie beschrieben, das Speisewasser vor dem Eintritt in die Wärmetauscherflächen durch Dampfturbinenkondensat gekühlt. Das trifft normalerweise auf Abhitzekessel zu, in denen Abluft aus Sinterkühlbändern gekühlt wird. Muss jedoch mit Korrosionsschäden gerechnet werden, so muss die Temperatur des Speisewassers vor dem Eintritt in die Wärmetauscherflächen 22 des Abhitzekessels 23 etwa der Temperatur des Entgasers 17 entsprechen. In diesem Fall wird abweichend von der Zeichnung der Wasser/Wasser-Wärmetauscher 21 in die Speisewasserleitung 19 stromaufwärts von dem Luftvorwärmer 24, und dem Gichtgasvorwärmer 25 und stromabwärts von dem Speisewasservorwärmer 26 verlegt. Dabei wird unter Absenkung der Speisewassertemperatur für den Speisewasservorwärmer 26 das Dampfturbinenkondensat vor dem Eintritt in dem Entgaser 17 vorgewärmt.The feed water is before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 on the physically lowest possible temperature cooled. Consists due to the composition of the waste heat boiler 23 exhaust gases flowing through there is no risk that a Below the dew point, the corrosion damage to the Heat exchanger surfaces causes, as described, that Feed water through before entering the heat exchanger surfaces Steam turbine condensate cooled. This usually happens Waste heat boilers in which exhaust air from sintered cooling belts is cooled becomes. However, corrosion damage must be expected, so the temperature of the feed water must be before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 approximately Temperature of the degasser 17 correspond. In this case deviating from the drawing of the water / water heat exchanger 21 in the feed water line 19 upstream of the Air preheater 24, and the top gas preheater 25 and downstream moved by the feed water preheater 26. It is under Lowering the feed water temperature for the Feed water preheater 26 the steam turbine condensate before Entry in the degasser 17 preheated.

Claims (8)

Verfahren zur Erzeugung von Dampf in einer Dampferzeugeranlage mit einem mit Gichtgas gefeuerten Dampferzeuger (1), dadurch gekennzeichnet, dass das entgaste und anschließend hochgespannte Speisewasser des Dampferzeugers (1) in einem von dem Dampferzeuger (1) unabhängigen Abhitzekessel (23) im Wärmetausch mit Abluft vorgewärmt wird und dass das dem Dampferzeuger (1) zugeführte Gichtgas und die dem Dampferzeuger (1) zugeführte Verbrennungsluft im Wärmetausch mit dem vorgewärmten Speisewasser in außen liegenden Vorwärmern (24, 25) vorgewärmt werden.Process for generating steam in a Steam generator system with a gas fired with blast furnace gas Steam generator (1), characterized in that the degassing and then high tension feed water of the Steam generator (1) in one of the steam generator (1) independent waste heat boiler (23) in heat exchange with exhaust air is preheated and that the steam generator (1) supplied Top gas and the steam generator (1) supplied Combustion air in heat exchange with the preheated one Feed water in external preheaters (24, 25) be preheated. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das entgaste Speisewasser in einem externen Wasser/Wasser-Wärmetauscher (21) im Wärmetausch mit Dampfturbinenkondensat gekühlt wird, dass der Druck des entgasten Speisewassers erhöht und dass das gekühlte und hochgespannte Speisewasser dem Ahitzekessel zugeführt wird.A method according to claim 1, characterized in that the degassed feed water in an external water / water heat exchanger (21) in heat exchange with steam turbine condensate is cooled that the pressure of the degassed feed water increased and that the chilled and high tension feed water is fed to the heat boiler. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Abhitzekessel (23) einer Sinteranlage zur Sinterung von Feinerzen nachgeschaltet ist und dass die in der Sinterkühlanlage mit unterschiedlichen Temperaturen anfallenden Abluftströme (27, 28, 29) entsprechend ihrem jeweiligen Temperaturniveau getrennt voneinander in den Abhitzekessel (23) eingeführt werden.A method according to claim 1 or 2, characterized in that that the waste heat boiler (23) of a sintering plant for sintering is connected by fine ores and that in the Sinter cooling system with different temperatures resulting exhaust air flows (27, 28, 29) according to their each temperature level separately in the Waste heat boiler (23) are introduced. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Speisewasser vor dem Eintritt in den Abhitzekessel (23) auf die physikalisch niedrigstmögliche Temperatur gekühlt wird. Method according to one of claims 1 to 3, characterized characterized in that the feed water before entering the Waste heat boiler (23) to the physically lowest possible Temperature is cooled. Dampferzeugeranlage zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 4, wobei der Dampferzeuger (1) der Dampferzeugeranlage eine mit Gichtgas befeuerte Brennkammer (2) und Nachschaltheizflächen aufweist, denen eine Dampfturbine (10), ein Kondensator (14) und ein Entgaser (17) nachgeschaltet sind und wobei an den Entgaser (17) eine Speisewasserleitung (19) angeschlossen ist, in der eine Speisewasserpumpe (20) zur Druckerhöhung angeordnet ist, dadurch gekennzeichnet, dass die Speisewasserleitung (19) zu Wärmetauscherflächen (22) geführt ist, die innerhalb eines von dem Dampferzeuger (1) unabhängigen Abhitzekessels (23) angeordnet sind und dass die Wärmetauscherflächen (22) des Abhitzekessels (23) speisewasserseitig mit einem Vorwärmer (24) zur Vorwärmung von Verbrennungsluft und mit einem Vorwärmer (25) zur Vorwärmung von Gichtgas verbunden sind.Steam generator system for performing the method according to Claims 1 to 4, wherein the steam generator (1) Steam generator system a combustion chamber fired with blast furnace gas (2) and Nachschaltheizflächen, which one Steam turbine (10), a condenser (14) and a degasser (17) are connected downstream and a to the degasser (17) Feed water line (19) is connected in one Feed water pump (20) is arranged to increase the pressure, characterized in that the feed water line (19) to Heat exchanger surfaces (22) is guided within a waste heat boiler (23) independent of the steam generator (1) are arranged and that the heat exchanger surfaces (22) of the Heat recovery boiler (23) on the feed water side with a preheater (24) for preheating combustion air and with a Preheater (25) are connected to preheat top gas. Dampferzeugeranlage nach Anspruch 5, dadurch gekennzeichnet, dass in der Speisewasserleitung (19) zwischen dem Entgaser (17) und der Speisewasserpumpe (20) ein Wasser/Wasser-Wärmetauscher (21) angeordnet ist, der an die Kondensatleitung (15) zwischen dem Kondensator (14) und dem Entgaser (17) angeschlossen ist.Steam generator system according to claim 5, characterized in that in the feed water line (19) between the degasser (17) and the feed water pump (20) a water / water heat exchanger (21) is arranged to the Condensate line (15) between the condenser (14) and the Degasser (17) is connected. Dampferzeugeranlage nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass der Abhitzekessel (23) einer Sinteranlage zur Sinterung von Feinerzen nachgeschaltet ist.Steam generator system according to claim 5 or 6, characterized characterized in that the waste heat boiler (23) one Sintering plant for sintering fine ores is connected downstream. Dampferzeugeranlage nach Anspruch 7, dadurch gekennzeichnet, dass der Abhitzekessel (23) zweigeteilt und mit mehreren Anschlüssen für die Zufuhr von unterschiedlichen Abluftströmen (27, 28, 29) versehen ist.Steam generator system according to claim 7, characterized in that that the waste heat boiler (23) divided into two and with several Connections for the supply of different Exhaust air flows (27, 28, 29) is provided.
EP00126349A 2000-01-15 2000-12-02 Steam generating method and plant Expired - Lifetime EP1116862B1 (en)

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DE10001512A DE10001512A1 (en) 2000-01-15 2000-01-15 Process for generating steam and a steam generator system

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US10054308B2 (en) 2014-09-11 2018-08-21 Ingenica Ingenierie Industrielle Method for generating steam from raw water, in particular from blow down water coming from a steam generator

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EP1116862B1 (en) 2005-02-09
ES2235747T3 (en) 2005-07-16
EP1116862A3 (en) 2002-09-25
DE10001512A1 (en) 2001-07-19
ATE288997T1 (en) 2005-02-15
DE50009474D1 (en) 2005-03-17

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