EP1116862B1 - Steam generating method and plant - Google Patents

Steam generating method and plant Download PDF

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Publication number
EP1116862B1
EP1116862B1 EP00126349A EP00126349A EP1116862B1 EP 1116862 B1 EP1116862 B1 EP 1116862B1 EP 00126349 A EP00126349 A EP 00126349A EP 00126349 A EP00126349 A EP 00126349A EP 1116862 B1 EP1116862 B1 EP 1116862B1
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Prior art keywords
feedwater
steam
waste heat
heat boiler
steam generator
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EP00126349A
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German (de)
French (fr)
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EP1116862A3 (en
EP1116862A2 (en
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Bernd Gericke
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MAN Energy Solutions SE
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MAN Turbo 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 process for the production of steam in a steam generator plant with a blast furnace fired Steam generator and a steam generator system.
  • the invention is based on the object, the generic To further develop the process such that on a Stützfashionung with noble fuels during the combustion of the top gas in the Continuous operation can be dispensed with.
  • Waste heat By coupling waste heat into the combustion process can also on lowered heating in the blast furnace gas Edelbrennstoffe be omitted as a support fire.
  • Waste heat is produced in sinter cooling plants of steelworks in which At the same time top gas as waste gas from the blast furnace process is produced.
  • the from the sintered ore to the cooling air emitted heat is transferred according to the invention Heat exchanger surfaces in the waste heat boiler through a Heat transfer system in the high pressure system of the steam generator coupled. This waste heat with different and especially low temperature level and waste gas with fluctuating and in particular low calorific value for production exploited by steam.
  • the temperature of the feedwater is before entering the Heat exchanger surfaces of the waste heat boiler on the physically lowered as low as possible. It is advantageous when the feed water through the heat exchange with the recycled steam turbine condensate is cooled. The on this way lowered temperature of the feedwater also allows decoupling heat from the low-temperature sintered cooling air.
  • the heat transfer system consists of two external ones additional preheaters, which the waste heat partly the Supply all combustion air and the fuel blast furnace gas.
  • the calorific value of the top gas is increased so much that in normal operation no support fire over high-calorie Noble fuels such as natural gas is necessary.
  • the drawing shows a process scheme for the production of steam.
  • a working according to the natural circulation principle steam generator. 1 contains a combustion chamber 2, one from top to bottom flowed through flue gas 3 is connected downstream. By doing Rauchgaszug 3 are Nachschaltsammlung vom as the superheater. 4 and the convection evaporator 4a is arranged.
  • a Natural circulation steam generator can also be a forced circulation or a Forced circulation steam generators are used. It can also another than the illustrated flue gas guide, z. B. Art a tower boiler can be used.
  • the steam generator 1 is fired with blast furnace gas.
  • the combustion chamber 2 is on the front side with only schematically shown Burners 5 provided.
  • the burner 5 are connected to an air line. 6 for supplying combustion air and with a blast gas line 7 connected to the supply of blast furnace gas.
  • This emergency fuel is supplied to the burners 5 via a gas line 8.
  • a steam line. 9 connected, which is guided to a steam turbine 10.
  • the Steam turbine 10 is connected to a generator 11 for generating electricity gekopppelt.
  • the steam turbine 10 can via a regulated Withdrawal 12 process steam taken in a steam network is fed.
  • the output of the steam turbine 10 is connected to an exhaust steam line 13 connected, which is guided to a capacitor 14.
  • Capacitor 14 the exhaust steam is condensed, and the Steam turbine condensate is via a condensate line 15, in a feed pump 16 is arranged, to a degasser 17th promoted.
  • the degasser 17 is operated with bleed steam, the is removed via a tap line 18 of the steam turbine 10.
  • a feedwater line 19th connected, in which a feedwater pump 20 is arranged, the pressure of the feedwater on the process pressure of the Steam generator 1 increased.
  • a Water / water heat exchanger 21 arranged at the same time the condensate line 15 is connected.
  • the feedwater line 19 is connected in parallel Heat exchanger surfaces 22 out in a waste heat boiler 23rd are arranged. Downstream of the heat exchanger surfaces 22nd is the feedwater line 19 with an external air preheater 24, to which the air line 6 is connected, and in parallel with a gas preheater 25, to which the blast furnace gas line 7 connected, connected. After the air preheater 24 and the gas preheater 25 is the feedwater line 19 to a feedwater pre-heater 26 led by the flue gas flows through, leaving the steam generator 1. This Feedwater pre-heater 26 is water-side with the water-steam cycle connected to the steam generator 1.
  • the waste heat boiler 23 is a sintering plant for sintering Fine ores downstream on a sintering belt.
  • air is resting on the sintering belt Layer fed to the sintering mixture or the sinter.
  • Air is the sintering process by the combustion of the Sinter mixture admixed silt maintained.
  • To Successful sintering is through additional fan cooling air through pressed or sucked the sinter. In this way falls longitudinally of the sintered cooling belt SK1 in the throttle cable 30 exhaust air with different temperatures and in different quantities or, as shown in the throttle cable 31, cooling air with a corresponding mixing temperature in 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 of the Waste heat boiler 23 are with connecting pieces for the different exhaust gas flows 27, 28, 29 provided.
  • Exhaust gas flow 29 which has a lower temperature than that Exhaust gas stream 28 is in the waste heat boiler 23 at one point fed to the exhaust stream 28 by cooling a Temperature has assumed that of about the exhaust stream 29th equivalent.
  • Both sinter cooling units SK1 and SK2 can be used in relation to on the above-described heat extraction in series be switched.
  • the water / water heat exchanger 21 is degassed Feed water from the degasser 17 in heat exchange with the Condensate from the condenser 14 as far as possible cooled.
  • the feedwater pump 20 By the feedwater pump 20, the pressure of the cooled Feed water to the process pressure of the steam generator 1 brought.
  • the temperature of the cooled and high-tensioned feedwater increased accordingly. With this temperature, the feed water enters the Air preheater 24 and the gas preheater 25, whereby the Combustion air and the top gas in each case the highest possible to be preheated.
  • the feed water Upon entering the feedwater preheater 26 the feed water then still has a temperature of a few Kelvin above the temperature in the degasser 17 on.
  • the values Depending on the conditions at the sinter cooling units SK1, SK2 and strong depending on the steam parameters present vary.
  • the feed water is before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 on the physically cooled as low as possible temperature. Consists due to the composition of the waste heat boiler 23 flowing exhaust gases do not risk that a Dew point falls occurs, the corrosion damage to the Heat exchange surfaces causes, as described, the Feed water before entering the heat exchanger surfaces through Steam turbine condensate cooled. That usually happens Waste heat boiler to, in which exhaust air from sintered cooling belts cooled becomes. However, it must be expected with corrosion damage, so must be the temperature of the feedwater before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 about the 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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Physical Water Treatments (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Air Supply (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Engine Equipment That Uses Special Cycles (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 process for the production of steam in a steam generator plant with a blast furnace fired Steam generator and a steam generator system.

Ein Verfahren zur Erzeugung von Dampf in einer Dampferzeugeranlage, die mit fossilen Brennstoffen befeuert wird, ist in DE 4327476 offenbart.A method of producing steam in one Steam generator plant fueled by fossil fuels, is disclosed in DE 4327476.

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.In metallurgical plants, process-related waste gases such as gout, Coke oven and converter gas. There is interest in this Exploit waste gases efficiently for power generation. Because of the increased investment and because of the technical Risk, these waste gases in gas turbines for combined processes use conventional solutions with Aspired high-pressure steam generators. In the process-related strong calorific value fluctuations, z. B. the top gas must in the Power generation to stabilize the combustion in the steam generator Natural gas and fuel oil are used as a support fire.

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, the generic To further develop the process such that on a Stützfeuerung with noble fuels during the combustion of the top gas in the 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 object is achieved in a generic method According to the invention by the characterizing features of Claim 1 solved. A steam generator plant for implementation of 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 on lowered heating in the blast furnace gas Edelbrennstoffe be omitted as a support fire. such Waste heat is produced in sinter cooling plants of steelworks in which At the same time top gas as waste gas from the blast furnace process is produced. The from the sintered ore to the cooling air emitted heat is transferred according to the invention Heat exchanger surfaces in the waste heat boiler through a Heat transfer system in the high pressure system of the steam generator coupled. This waste heat with different and especially low temperature level and waste gas with fluctuating and in particular low calorific value for production 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 designed due to the special temperature and Cooling air flow ratios particularly complex. Along the Sintered tape is transferred to the sintered material at various points Cooling air withdrawn heat, causing heat sources different Temperturniveaus emerge. To a correspondingly high proportion make good use of the different heat potential may require a special waste heat boiler concept. Of the Exergetically most interesting part of the waste heat from the Sinter cooling plant makes only a small percentage of total amount of cooling air. During this relatively low cooling air mass flow thanks to its higher gas temperature is especially for high feedwater warming, is the larger cooling air mass flow at low temperature for remaining feedwater pre-heating used. To additional Temperature stretches on the cooling air side are to be avoided 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 lowering of the temperature of the degassed 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 feedwater is before entering the Heat exchanger surfaces of the waste heat boiler on the physically lowered as low as possible. It is advantageous when the feed water through the heat exchange with the recycled steam turbine condensate is cooled. The on this way lowered temperature of the feedwater also allows decoupling 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, which the waste heat partly the Supply all combustion air and the fuel blast furnace gas. As a result, the calorific value of the top gas is increased so much that in normal operation no support fire over high-calorie Noble fuels such as 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 and will be explained in more detail below. The drawing shows a process scheme for the production of 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 Naturumlaufdampferzeugers 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 working according to the natural circulation principle steam generator. 1 contains a combustion chamber 2, one from top to bottom flowed through flue gas 3 is connected downstream. By doing Rauchgaszug 3 are Nachschaltheizflächen as the superheater. 4 and the convection evaporator 4a is arranged. Instead of a Natural circulation steam generator can also be a forced circulation or a Forced circulation steam generators are used. It can also another than the illustrated flue gas guide, z. B. 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 on the front side with only schematically shown Burners 5 provided. The burner 5 are connected to an air line. 6 for supplying combustion air and with a blast gas line 7 connected to the supply of blast furnace gas. In case of incidents and at Failure of the waste heat boiler 23 described later can for Protection of steam power coke oven gas or natural gas as Emergency fuel be used. This emergency fuel is supplied 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.To the superheater 4 of the steam generator 1 is a steam line. 9 connected, which is guided to a steam turbine 10. The Steam turbine 10 is connected to a generator 11 for generating electricity gekopppelt. The steam turbine 10 can via a regulated Withdrawal 12 process steam taken in 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 output of the steam turbine 10 is connected to an exhaust steam line 13 connected, which is guided to a capacitor 14. By doing Capacitor 14, the exhaust steam is condensed, and the Steam turbine condensate is via a condensate line 15, in a feed pump 16 is arranged, to a degasser 17th promoted. The degasser 17 is operated with bleed steam, the is removed via a tap line 18 of the steam turbine 10.

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.At the degasser 17 is a feedwater line 19th connected, in which a feedwater pump 20 is arranged, the pressure of the feedwater on the process pressure of the Steam generator 1 increased. In the feedwater line 19 is between the degasser 17 and the feedwater pump 20 a Water / water heat exchanger 21 arranged 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 feedwater line 19 is connected in parallel Heat exchanger surfaces 22 out in a waste heat boiler 23rd are arranged. Downstream of the heat exchanger surfaces 22nd is the feedwater line 19 with an external air preheater 24, to which the air line 6 is connected, and in parallel with a gas preheater 25, to which the blast furnace gas line 7 connected, connected. After the air preheater 24 and the gas preheater 25 is the feedwater line 19 to a feedwater pre-heater 26 led by the flue gas flows through, leaving the steam generator 1. This Feedwater pre-heater 26 is water-side with the water-steam cycle connected to the steam generator 1.

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 plant for sintering Fine ores downstream on a sintering belt. During the Sintering process, air is resting on the sintering belt Layer fed to the sintering mixture or the sinter. By the Air is the sintering process by the combustion of the Sinter mixture admixed silt maintained. To Successful sintering is through additional fan cooling air through pressed or sucked the sinter. In this way falls longitudinally of the sintered cooling belt SK1 in the throttle cable 30 exhaust air with different temperatures and in different quantities or, as shown in the throttle cable 31, cooling air with a corresponding mixing temperature in the sintered cooling belt SK2. Around these different exhaust air streams 27, 28, 29 in the waste heat boiler 23 exploit, 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 of the Waste heat boiler 23 are with connecting pieces for the different exhaust gas flows 27, 28, 29 provided. Of the Exhaust gas flow 29, which has a lower temperature than that Exhaust gas stream 28 is in the waste heat boiler 23 at one point fed to the exhaust stream 28 by cooling a Temperature has assumed that of about the exhaust stream 29th equivalent. Both sinter cooling units SK1 and SK2 can be used in relation to on the above-described heat extraction 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.In the water / water heat exchanger 21 is degassed Feed water from the degasser 17 in heat exchange with the Condensate from the condenser 14 as far as possible cooled. By the feedwater 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-tensioned feedwater increased accordingly. With this temperature, the feed water enters the Air preheater 24 and the gas preheater 25, whereby the Combustion air and the top gas in each case the highest possible to be preheated. Upon entering the feedwater preheater 26 the feed water then still has a temperature of a few Kelvin above the temperature in the degasser 17 on. The values Depending on the conditions at the sinter cooling units SK1, SK2 and strong depending on the steam parameters present 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 cooled as low as possible temperature. Consists due to the composition of the waste heat boiler 23 flowing exhaust gases do not risk that a Dew point falls occurs, the corrosion damage to the Heat exchange surfaces causes, as described, the Feed water before entering the heat exchanger surfaces through Steam turbine condensate cooled. That usually happens Waste heat boiler to, in which exhaust air from sintered cooling belts cooled becomes. However, it must be expected with corrosion damage, so must be the temperature of the feedwater before entering the Heat exchanger surfaces 22 of the waste heat boiler 23 about the Temperature of the degasser 17 correspond. In this case will notwithstanding the drawing of the water / water heat exchanger 21st into the feedwater line 19 upstream of the Air preheater 24, and the top gas preheater 25 and downstream moved from the feedwater heater 26. It is under Lowering the feedwater temperature for the Feedwater preheater 26, the steam turbine condensate before the Entrance to the degasser 17 preheated.

Claims (8)

  1. Method of generating steam in a steam generating plant with a steam generator (1) fired by throat gas, characterised in that the degasified and subsequently highly pressurised feedwater of the steam generator (1) is preheated in heat exchange by exhaust air in a waste heat boiler (23) independent of the steam generator (1) and that the throat gas, which is fed to the steam generator (1) and the combustion air, which is fed to the steam generator (1), are preheated in heat exchange with the preheated feedwater in externally disposed preheaters (24, 25).
  2. Method according to claim 1, characterised in that the degasified feedwater is cooled in an external water/water heat exchanger (21) in heat exchange with steam turbine condensate, that the pressure of the degasified feedwater is increased and that the cooled and highly pressurised feedwater is fed to the waste heat boiler.
  3. Method according to claim 1 or 2, characterised in that the waste heat boiler (23) is connected downstream of a sintering plant for sintering ore dust and that the exhaust air flows (27, 28, 29) occurring in the sinter cooling plant at different temperatures are introduced separately from one another into the waste heat boiler (23) in correspondence with their respective temperature level.
  4. Method according to one of claims 1 to 3, characterised in that the feedwater is cooled to the physically lowest possible temperature before entry into the waste heat boiler (23).
  5. Steam generating plant for carrying out the method according to daims 1 to 4, wherein the steam generator (1) of the steam generating plant comprises a combustion chamber (2), which is fired by throat gas, and downstream heating surfaces, downstream of which are connected a steam turbine (10), a condenser (14) and a degasifier (17), and wherein a feedwater duct (19), in which a feedwater pump (20) for increasing pressure is arranged, is connected with the degasifier (17), characterised in that the feedwater duct (19) is led to heat exchange surfaces (22) which are arranged within a waste heat boiler (23) independent of the steam generator (1) and that the heat exchange surfaces (22) of the waste heat boiler (23) are connected at the feedwater side with a preheater (24) for preheating combustion air and with a preheater (25) for preheating throat gas.
  6. Steam generating plant according to claim 5, characterised in that a water/water heat exchanger (21) connected with the condensate duct (15) between the condenser (14) and the degasifier (17) is arranged in the feedwater duct (19) between the degasifier (17) and the feedwater pump (20).
  7. Steam generating plant according to claim 5 or 6, characterised in that the waste heat boiler (23) is connected downstream of a sintering plant for sintering ore dust.
  8. Steam generating plant according to claim 7, characterised in that the waste heat boiler (23) is of two-part construction and provided with a plurality of connections for the feed of different exhaust air flows (27, 28, 29).
EP00126349A 2000-01-15 2000-12-02 Steam generating method and plant Expired - Lifetime EP1116862B1 (en)

Applications Claiming Priority (2)

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DE10001512A DE10001512A1 (en) 2000-01-15 2000-01-15 Process for generating steam and a steam generator system
DE10001512 2000-01-15

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EP1116862A2 EP1116862A2 (en) 2001-07-18
EP1116862A3 EP1116862A3 (en) 2002-09-25
EP1116862B1 true EP1116862B1 (en) 2005-02-09

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AT (1) ATE288997T1 (en)
DE (2) DE10001512A1 (en)
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN101294502B (en) * 2007-04-23 2010-12-08 张庆玉 Multifunctional vacuum firepower waterpower dual-power generation and water-lifting water distributing station

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
FR3003337B1 (en) 2013-03-12 2017-06-23 Ingenica Ingenierie Ind METHOD FOR GENERATING WATER VAPOR AND METHOD FOR RECOVERING RAW OIL BY WATER VAPOR INJECTION ASSISTED GRAVITY DRAINAGE (SAGD) INCLUDING SAID METHOD OF GENERATING WATER VAPOR
FR3025828B1 (en) 2014-09-11 2017-06-02 Ingenica Ingenierie Ind METHOD FOR GENERATING WATER VAPOR FROM RAW WATER, ESPECIALLY PURGING WATER FROM A STEAM GENERATOR

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Publication number Priority date Publication date Assignee Title
DE2243380C3 (en) * 1972-09-04 1978-07-20 Kraftwerk Union Ag, 4330 Muelheim Steam power plant with flue gas heated feed water preheater and water heated air preheater
DE3324283A1 (en) * 1983-07-06 1985-01-24 Kleinewefers Energie- und Umwelttechnik GmbH, 4150 Krefeld Sintering belt installation with device for waste heat utilisation
DE4327476C2 (en) * 1993-08-16 1997-04-03 Steinmueller Gmbh L & C Process for operating a steam generator fired with fossil fuels and steam generating plant
DE29608816U1 (en) * 1996-05-15 1996-08-01 Deutsche Babcock Babcock Lentjes Kraftwerkstechnik GmbH Standort Berlin, 10407 Berlin Arrangement for the use of waste heat from cement clinker lines
DE19645322B4 (en) * 1996-11-04 2010-05-06 Alstom Combined power plant with a forced once-through steam generator as a gas turbine cooling air cooler
JPH11325406A (en) * 1998-05-07 1999-11-26 Ebara Corp Feed water heating device for thermal power generation facility

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101294502B (en) * 2007-04-23 2010-12-08 张庆玉 Multifunctional vacuum firepower waterpower dual-power generation and water-lifting water distributing station

Also Published As

Publication number Publication date
ES2235747T3 (en) 2005-07-16
ATE288997T1 (en) 2005-02-15
EP1116862A3 (en) 2002-09-25
EP1116862A2 (en) 2001-07-18
DE50009474D1 (en) 2005-03-17
DE10001512A1 (en) 2001-07-19

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