DE3607210A1 - Steam generator with NOx reduction installation - Google Patents
Steam generator with NOx reduction installationInfo
- Publication number
- DE3607210A1 DE3607210A1 DE19863607210 DE3607210A DE3607210A1 DE 3607210 A1 DE3607210 A1 DE 3607210A1 DE 19863607210 DE19863607210 DE 19863607210 DE 3607210 A DE3607210 A DE 3607210A DE 3607210 A1 DE3607210 A1 DE 3607210A1
- Authority
- DE
- Germany
- Prior art keywords
- steam
- steam generator
- nox reduction
- reducing valve
- feed water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/025—Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
Dampf erz euger mit NOx-Minderungsanlage Steam generator with NOx reduction system
x Beschreibung: Für die NOx-Minderung der Rauchgase müssen bestimmte Mindesttemperaturen in d#r Reduktionsanlage einigehalten werden. x Description: For the NOx reduction of the smoke gases, certain Minimum temperatures in the reduction system are observed.
Bei fossil befeuerten Dampferzeugern sinkt jedvçh im Schwachlastbereich die Rauchgastemperatur unter den erforderlichen Mindestwert. In the case of fossil-fired steam generators, however, it sinks in the low-load range the flue gas temperature below the required minimum value.
Es sind deshalb anlagentechnische Maßnahmen zur Einhaltung dieser Mindesttemperatur bei geringen Lasten zu treffen. There are therefore technical measures to comply with these Minimum temperature to be met at low loads.
Um dies zu erreichen, wird vorgeschlagen, die betrieblich vorhandene, dampfbeheizte Speisewasservorwärmeranlage für diesen Zweck mit zu verwenden. In order to achieve this, it is suggested that the operationally existing, to use steam-heated feed water preheater for this purpose.
Entsprechend Beispiel nach Schaltbild 1 wird hierzu ein, durch seine betrieblichen Auslegungsdaten geeigneter Speisewasservorwärmer 4 ausgewählt. Im Schwachlastbereich wird dieser Vorwärmer durch Öffnen des Reduzierventiles 9 von seiner normalen betrieblichen Dampfversorgung qetrennt. According to the example according to circuit diagram 1, a, through its operational design data of suitable feedwater preheater 4 selected. in the This preheater is low-load by opening the reducing valve 9 from its normal operational steam supply.
Durch den Druckanstieg im Speisewasservorwärmer 4 schließt die Rückschlagklappe 21 selbsttätig. Anschließend kann zusätzlich noch Schieber 11 geschlossen werden.Due to the increase in pressure in the feedwater preheater 4, the non-return valve closes 21 automatic. Then slide 11 can also be closed.
Bei der Dampfversorgung des Speisewasservorwärmers 4 aus dem Hochdrucksystem der Anlage, wird in den meisten Fällen auch eine Dampfkühlung erforderlich sein, die über ein Einspritzventil 11 erfolgen kann.When supplying steam to the feedwater preheater 4 from the high-pressure system of the system, steam cooling will also be required in most cases, which can take place via an injection valve 11.
Der Druck im Speisewasservorwärmer 4 wird angehoben.The pressure in the feed water preheater 4 is increased.
Dadurch steigt die Endvorwärmung des Speisewassers. Als weitere Folge ergibt sich, daß die Wärmeaufnahme des Economisers 5 sinkt und somit die Rauchgastemperatur vor NOx-Minderungsanlage 16 steigt, bzw. es wird das weitere Absinken der Rauchgastemperatur bei Schwachlast verhindert.This increases the final preheating of the feed water. As a further consequence the result is that the heat consumption of the economizer 5 drops and thus the flue gas temperature Before the NOx reduction system 16 rises, or there will be a further decrease in the flue gas temperature prevented at low load.
Durch die Druckanhebung im Speisewasservorwärmer 4 ist es weiterhin möglich, aus diesem Teilsystem über eine Entnahme 18 im Schwachlastbereich auch Verbraucher zu versorgen, die einen höheren Betriebsdruck erfordern, z. B.Due to the increase in pressure in the feedwater preheater 4, it is still there possible, also from this subsystem via a withdrawal 18 in the low-load range To supply consumers that require a higher operating pressure, e.g. B.
Öl zerstäuber.Oil atomizer.
Bei steigender Dampferzeugerleistung wird durch Öffnen des Schiebers 11 und Schließen des Reduzierventils 9 die Maßnahme wieder rückgängig gemacht.When the steam generator output increases, the slide is opened 11 and closing the reducing valve 9 reversed the measure.
Bei Kaltstart der Anlage kann das Reduzierventil 9 zur Anwärmung der Frischdampfleitung bis unmittelbar vor Turbine 12 bzw. Dampfverbraucher sinnvoll eingesetzt werden. Das sich bei der Anwärmung der Frischdampfleitung bildende Kondensat wird über die Entwässserungsventile 8 abgeführt, während die Überhitzungswärme durch den Dampf eingebracht wird, der über das Reduzierventil 9 zur regenerativen Speisewasservorwärmung genutzt wird. Dadurch werden die Anfahrverluste verringert.When the system starts cold, the reducing valve 9 can be used to warm the Main steam line up to directly in front of turbine 12 or steam consumer makes sense can be used. The condensate that forms when the main steam line is heated is discharged via the drainage valves 8, while the overheating through the steam is introduced, which via the reducing valve 9 for regenerative feed water preheating is being used. This reduces start-up losses.
Zur Absicherung des Speisewasservorwärmers gegen zu hohen Druck oder zu hohe Temperatur bei Störungen ist es sinnvoll, Maßnahmen zum sicheren Schließen des Reduzierventils 9 vorzusehen. Außerdem wird vorgeschlagen, für Ventilleckagen ein Sicherheitsventil 20 einzubauen.To protect the feed water preheater against excessively high pressure or If the temperature is too high, it makes sense to take measures for safe closing of the reducing valve 9 to be provided. It is also suggested for valve leaks to install a safety valve 20.
Stand der Technik: Die Aufgabenstellung ist wegen der noch nicht lange verwendeten NO Minderungstechnik im Schwachlastbereich relativ neu. Bisher wurden Maßnahmen vorwiegend am Dampferzeuger selbst diskutiert und untersucht. Das Problem der Rauchgastemperaturstützung wird bisher durch eine separate Umwälzpumpe und speisewasserseitiger Umführung des Economisers oder rauchgasseitiger Umführunq des Economisers oder Rauchgasrücksaugung oder Zusatzbrenner vor NOx-Minderungsanlage gelöst.State of the art: The task has not been long because of the used NO reduction technology in the low-load range relatively new. So far have been Measures mainly discussed and examined on the steam generator itself. The problem up to now, the flue gas temperature support has been provided by a separate circulating pump and on the feed water side Bypassing the economizer or bypassing the economizer on the flue gas side or flue gas recirculation or additional burner detached in front of the NOx reduction system.
Alle diese Maßnahmen erfordern einen entsprechend hohen Investitionskostenaufwand mit anlagenspezifischen Störmöglichkeiten und Wartungsaufwand. All of these measures require a correspondingly high investment cost with system-specific fault possibilities and maintenance effort.
Die Aufgabe soll deshalb erfindungsgemäß betrieblich einfacher und kostengünstiger durch Zuhilfenahme vorhandener Speisewasservorwärmer und einer Dampfreduzierstation gelöst werden. According to the invention, the task should therefore be operationally simpler and cheaper by using existing feed water preheaters and a steam reduction station be solved.
Ausführungsbeispiel: Schaltbild 1 zeigt anhand eines typischen Wärmeschaltbildes für ein Kondensationskraftwerk, wie die Speisewassertemperatur vor Economiser 5 bei Schwachlast angehoben werden kann. Durch Öffnen des Reduziervertiles 9 schließt die Rückschlagklappe 21 selbsttätig. Der Speisewasservorwärmer 4 ist dadurch bereits von der kalten Zwischenüberhitzerleitung getrennt. Der Schieber 11 kann zusätzlich geschlossen werden.Exemplary embodiment: Circuit diagram 1 shows a typical thermal circuit diagram for a condensing power plant, like the feed water temperature upstream of the economiser 5 can be increased at low load. By opening the reducing valve 9 closes the check valve 21 automatically. The feed water preheater 4 is already there separated from the cold reheater line. The slide 11 can also getting closed.
Bei Laststeigerung wird Reduzierventil 9 geschlossen und die Rückschlagklappe 11 öffnet selbsttätig, wenn Schieber 11 geöffnet wurde. When the load increases, the reducing valve 9 is closed and the non-return valve 11 opens automatically when slide 11 has been opened.
Im Schaltbild 1 bedeuten: 1 - Niederdruckvorwärmer 2 - Speisewasserbehälter 3, 4 - Hochdruckvorwärmer 5 - rauchgasbeheizter Economiser 6 - Verdampfer 7 - HD-[)berhitzer 8 - Enwässerungsventil für Anwärmung 9 - Dampfreduzierventil 10 - Einspritzwasserventil 11 - Absperrschieber 12 - HD-Turbine 13 - MD-Turbine 14 - ND-Turbine 15 - Kondensator 16 - NOx-Minderungsanlage 17 - Luftvorwärmer 18 - Entnahme für Hilfsdampfverbraucher bei Schwachlast 19 - Zwischenüberhitzer 20 - Sicherheitsventil für Leckdampf 21 - Rückschlagklappe 22 - Reduzierstation von HD nach ZU. In circuit diagram 1: 1 - low pressure preheater 2 - feed water tank 3, 4 - high pressure preheater 5 - flue gas heated economiser 6 - evaporator 7 - HP - [) superheater 8th - Drainage valve for heating 9 - Steam reducing valve 10 - Injection water valve 11 - Gate valve 12 - HP turbine 13 - MD turbine 14 - LP turbine 15 - condenser 16 - NOx reduction system 17 - Air preheater 18 - Extraction for auxiliary steam consumers at low load 19 - reheater 20 - safety valve for leakage steam 21 - Non-return valve 22 - Reducing station from HD to CLOSED.
- Leerseite -- blank page -
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863607210 DE3607210A1 (en) | 1986-03-05 | 1986-03-05 | Steam generator with NOx reduction installation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863607210 DE3607210A1 (en) | 1986-03-05 | 1986-03-05 | Steam generator with NOx reduction installation |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3607210A1 true DE3607210A1 (en) | 1986-08-28 |
DE3607210C2 DE3607210C2 (en) | 1988-07-07 |
Family
ID=6295555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19863607210 Granted DE3607210A1 (en) | 1986-03-05 | 1986-03-05 | Steam generator with NOx reduction installation |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3607210A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT403414B (en) * | 1993-06-14 | 1998-02-25 | Vaillant Gmbh | Method for controlling the boiler return temperature |
DE102005034847A1 (en) * | 2005-07-26 | 2007-02-08 | Steag Saar Energie Ag | Steam power station comprises switching units intended for switching off the last high-pressure preheater in front of the steam generator within the framework of primary regulation of the mains frequency |
DE102010041962B3 (en) * | 2010-10-05 | 2012-02-16 | Siemens Aktiengesellschaft | Fossil fired steam generator |
EP3444449A1 (en) * | 2017-08-18 | 2019-02-20 | Siemens Aktiengesellschaft | Installation with bypass station |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10227709B4 (en) * | 2001-06-25 | 2011-07-21 | Alstom Technology Ltd. | Steam turbine plant and method for its operation |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE550827C (en) * | 1927-03-16 | 1932-05-24 | Siemens Schuckertwerke Akt Ges | Device for preheating boiler feed water through the evaporation of a counter-pressure machine regulated for output, in particular an in-house turbine |
-
1986
- 1986-03-05 DE DE19863607210 patent/DE3607210A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE550827C (en) * | 1927-03-16 | 1932-05-24 | Siemens Schuckertwerke Akt Ges | Device for preheating boiler feed water through the evaporation of a counter-pressure machine regulated for output, in particular an in-house turbine |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT403414B (en) * | 1993-06-14 | 1998-02-25 | Vaillant Gmbh | Method for controlling the boiler return temperature |
DE102005034847A1 (en) * | 2005-07-26 | 2007-02-08 | Steag Saar Energie Ag | Steam power station comprises switching units intended for switching off the last high-pressure preheater in front of the steam generator within the framework of primary regulation of the mains frequency |
DE102005034847B4 (en) * | 2005-07-26 | 2016-02-11 | Steag Power Saar Gmbh | Steam power plant |
DE102010041962B3 (en) * | 2010-10-05 | 2012-02-16 | Siemens Aktiengesellschaft | Fossil fired steam generator |
WO2012045677A3 (en) * | 2010-10-05 | 2013-01-17 | Siemens Aktiengesellschaft | Fossil-fired steam generator |
CN103154443A (en) * | 2010-10-05 | 2013-06-12 | 西门子公司 | Fossil-fired steam generator |
CN103154443B (en) * | 2010-10-05 | 2015-04-01 | 西门子公司 | Fossil-fired steam generator |
US9506376B2 (en) | 2010-10-05 | 2016-11-29 | Siemens Aktiengesellschaft | Fossil-fired steam generator |
EP3444449A1 (en) * | 2017-08-18 | 2019-02-20 | Siemens Aktiengesellschaft | Installation with bypass station |
Also Published As
Publication number | Publication date |
---|---|
DE3607210C2 (en) | 1988-07-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: SIEMENS AG, 1000 BERLIN UND 8000 MUENCHEN, DE |
|
8381 | Inventor (new situation) |
Free format text: RIMMELSPACHER, JUERGEN, DIPL.-ING. (FH), 8068 PFAFFENHOFEN, DE |
|
8339 | Ceased/non-payment of the annual fee |