DE19741120A1 - Operation of dual circuit gas scrubber used in flue gas desulphurisation - Google Patents

Operation of dual circuit gas scrubber used in flue gas desulphurisation

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Publication number
DE19741120A1
DE19741120A1 DE19741120A DE19741120A DE19741120A1 DE 19741120 A1 DE19741120 A1 DE 19741120A1 DE 19741120 A DE19741120 A DE 19741120A DE 19741120 A DE19741120 A DE 19741120A DE 19741120 A1 DE19741120 A1 DE 19741120A1
Authority
DE
Germany
Prior art keywords
circuit
gas scrubber
flue gas
suspension
gas
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.)
Ceased
Application number
DE19741120A
Other languages
German (de)
Inventor
Juergen Pfeiffer
Volker Liebmann
Sigrun Hajdamowicz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vattenfall Europe Generation AG and Co KG
Original Assignee
VEAG Vereinigte Energiewerke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by VEAG Vereinigte Energiewerke AG filed Critical VEAG Vereinigte Energiewerke AG
Priority to DE19741120A priority Critical patent/DE19741120A1/en
Publication of DE19741120A1 publication Critical patent/DE19741120A1/en
Ceased legal-status Critical Current

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Classifications

    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The process is for the operation of a flue gas desulphurisation plant for power plant burning fossil fuel and/or waste. The plant has a two-stage or dual-circuit gas scrubber (1). The adsorbent suspension is made up in a tank (9), and pumped (12) into the upper gas scrubber circuit (24). Oxidation air (20) is introduced into the lower circuit (21) of the gas scrubber. Oxidation air (17) is introduced entirely or in part, into the absorbent tank, and/or in other suitable locations in the upper circuit.

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Rauchgasentschwefelungsanlage für ein mit fossilen Brenn­ stoffen und/oder Müll betriebenes Kraftwerk mit einem Zwei­ stufen- bzw. Zweikreis-Gaswäscher.The invention relates to a method for operating a Flue gas desulphurization plant for a with fossil fuel power and / or garbage operated power plant with a two stage or dual circuit gas scrubber.

Bei der Rauchgasentschwefelung in einem Zweistufen- bzw. Zweikreis-Gaswäscher wird eine Absorptionsmittel-Suspension über die Düsenebenen des oberen Kreislaufes und Oxidations­ luft in den Sumpf des unteren Kreislaufes eingebracht.With flue gas desulfurization in a two-stage or Dual-circuit scrubber becomes an absorbent suspension across the nozzle levels of the upper circuit and oxidation air is introduced into the sump of the lower circuit.

Bei geringen SO2-Gehalten der Rauchgase wird über den che­ misch-physikalischen Wirkungsmechanismus die angestrebte Oxidation des primär entstehenden Sulfites zu Gips erreicht. Es wurde jedoch festgestellt, daß bei höheren SO2-Gehalten der Rauchgase die Oxidation im oberen Kreislauf nur unzurei­ chend erfolgt und sulfitische Ablagerungen entstehen.With low SO 2 contents of the flue gases, the desired chemical oxidation of the primary sulfite to gypsum is achieved via the chemical-physical mechanism of action. However, it was found that at higher SO 2 contents of the flue gases, the oxidation in the upper circuit is insufficient and sulfitic deposits are formed.

Es hat nicht an Versuchen gefehlt, die Ablagerungen zu ver­ meiden bzw. zu kompensieren.There has been no shortage of attempts to remove the deposits avoid or compensate.

So wird z. B. aus dem Sumpf des unteren Kreislaufes des Gas­ wäschers ein Teilstrom der Suspension in den oberen Kreis­ lauf eingebracht. Dadurch wurden die Ablagerungen erheblich zurückgedrängt, jedoch werden aus dem unteren Kreislauf Chloride und andere Salze ungewollt in den oberen Kreislauf eingetragen. Damit wird der Entschwefelungswirkungsgrad er­ heblich verringert. Außerdem wird die Regelbarkeit des Sy­ stems, vor allem die optimale pH-Wert-Einstellung, einge­ schränkt bzw. sehr kompliziert.So z. B. from the bottom of the lower circuit of the gas scrubber a partial flow of the suspension in the upper circle introduced. This made the deposits significant pushed back, however, from the lower cycle Chlorides and other salts unwanted in the upper circulation registered. The desulfurization efficiency is thus increased significantly reduced. In addition, the controllability of the Sy stems, especially the optimal pH value setting limits or very complicated.

Der Erfindung liegt daher die Aufgabe zugrunde, eine für die Oxidation des Sulfites zu Gips ausreichende Menge Sauerstoff in die Suspension des oberen Kreislaufes einzubringen, damit sulfitische Ablagerungen vermieden werden und ein hoher Ent­ schwefelungswirkungsgrad erreicht wird.The invention is therefore based on the object, one for the Oxidation of the sulfite to gypsum sufficient amount of oxygen in the suspension of the upper circuit so that sulfitic deposits are avoided and a high ent sulfurization efficiency is reached.

Dies wird dadurch erreicht, daß erfindungsgemäß die Oxidati­ onsluft ganz oder teilweise in den Absorptionsmittel­ behälter und/oder an anderer geeigneter Stelle in den oberen Kreislauf eingebracht wird.This is achieved in that the Oxidati air completely or partially in the absorbent container and / or other suitable location in the upper Circuit is introduced.

Überraschenderweise wurde nach umfangreichen Versuchen festgestellt, daß die Oxidation nicht ausreichend erfolgt, weil nur ungenügend Sauerstoff aus den Rauchgasen in die Suspension des oberen Kreislaufes diffundiert und das primär entstehende Sulfit nur unvollständig zu Gips aufoxidiert wird, obwohl überstöchiometrisch Oxidationsluft in den Sumpf des Gaswäschers eingebracht wird und ausreichend Sau­ erstoff im Rauchgas vorhanden ist.Surprisingly, after extensive trials found that the oxidation is insufficient, because only insufficient oxygen from the flue gases into the Suspension of the upper circulation diffuses and the primary The resulting sulfite is only partially oxidized to gypsum is, although super stoichiometric oxidation air in the Bottom of the scrubber is introduced and sufficient sow is present in the flue gas.

Durch die Erfindung wird gewährleistet, daß eine ausreichen­ de Menge Sauerstoff bereits in der Flüssigkeitsphase gelöst wird.The invention ensures that one is sufficient de amount of oxygen already dissolved in the liquid phase becomes.

Anhand eines Ausführungsbeispiels wird die Erfindung erläu­ tert. Die Zeichnung zeigt den Zweikreis-Gaswäscher für die Rauchgasentschwefelung in schematischer Darstellung.The invention is explained using an exemplary embodiment tert. The drawing shows the dual-circuit scrubber for the Flue gas desulfurization in a schematic representation.

Der Gaswäscher 1 weist den Sumpf 2 des unteren Kreislaufes, die unteren Düsenebenen 3 und die oberen Düsenebenen 4 sowie den Sammler 5 auf. In den Gaswäscher 1 ist die Rauchgaslei­ tung 6 und die Reingasleitung 7 sowie die Oxidationsluftlei­ tung 8 eingebunden. In den Absorptionsmittelbehälter 9 ist die Absorptionsmittelleitung 10, die Suspensionsleitung 11 für den oberen Kreislauf mit Pumpe 12 für die oberen Düsene­ benen 4, die mit dem Sumpf 2 des unteren Kreislaufes verbun­ dene Suspensionsleitung 13 und die Sammlerleitung 14 einge­ bunden. Die unteren Düsenebenen 3 sind über die Suspensions­ leitung 15 mit Pumpe 16 in den Sumpf 2 eingebunden.The gas scrubber 1 has the sump 2 of the lower circuit, the lower nozzle levels 3 and the upper nozzle levels 4 and the collector 5 . In the gas scrubber 1 , the Rauchgaslei device 6 and the clean gas line 7 and the Oxidationsluftlei device 8 is integrated. In the absorbent container 9 is the absorbent line 10 , the suspension line 11 for the upper circuit with pump 12 for the upper nozzles 4 , the verbun to the sump 2 of the lower circuit suspension line 13 and the collector line 14 is connected. The lower nozzle levels 3 are connected via the suspension line 15 with pump 16 in the sump 2 .

In den Absorptionsmittelbehälter 9 und/oder in die Absorpti­ onsmittel-Suspensionsleitung 24 ist die Oxidationsluftlei­ tung 17 eingebunden.In the absorbent container 9 and / or in the Absorpti onsmittel-suspension line 24 , the Oxidationsluftlei device 17 is integrated.

Die Wirkungsweise ist folgende:
Durch die zusätzliche Zuführung von Oxiluft in den Absorpti­ onsmittelbehälter wird der für die Oxidation des primär ge­ bildeten Sulfits zu Gips benötigte Sauerstoff in ausreichen­ der Menge in der Flüssigphase gelöst.The mode of action is as follows:
The additional supply of Oxiluft in the Absorpti onsmittel Containers the oxygen required for the oxidation of the primary ge formed sulfite to gypsum is dissolved in sufficient quantity in the liquid phase.

Durch die Erfindung werden folgende Vorteile erreicht:
The following advantages are achieved by the invention:

  • 1. Reduzierung der Ablagerungen im oberen Kreislauf.1. Reduction of deposits in the upper circuit.
  • 2. Beibehaltung des für Kalkstein optimierten Wirkprinzips des Zweikreiswäschers, d. h., hoher Wirkungsgrad durch hohe pH-Werte im oberen Kreislauf und Vermeidung der Chlorideintragung aus dem unteren Kreislauf.2. Maintaining the active principle optimized for limestone the dual-circuit washer, d. i.e., high efficiency through high pH values in the upper circulation and avoidance of Chloride entry from the lower circuit.
  • 3. Durch niedrige pH-Werte im unteren Kreislauf werden eine sehr gute Gipsqualität und die maximale, fast quantitati­ ve Ausnutzung der eingesetzten Kalksteinmengen erreicht.3. Due to low pH values in the lower circuit, one very good quality plaster and the maximum, almost quantitative ve utilization of the limestone quantities used has been achieved.
BezugszeichenlisteReference list

1 Gaswäscher
2 Sumpf
3 untere Düsenebene
4 obere Düsenebene
5 Sammler
6 Rauchgasleitung
7 Reingasleitung
8 Oxidationsluftleitung
9 Absorptionsmittelbehälter
10 Absorptionsmittelleitung
11 Suspensionsleitung
12 Pumpe
13 Suspensionsleitung
14 Suspensionsleitung
15 Suspensionsleitung
16 Pumpe
17 Oxidationsluftleitung
18 Rauchgas
19 Absorptionsmittel-Suspension
20 Oxidationsluft
21 Absorptionsmittel-Suspension
22 frische Absorptionsmittel-Suspension
23 Oxidationsluft
24 Absorptionsmittel-Suspension
25 Absorptionsmittel-Suspension
26 Absorptionsmittel-Suspension
27 Reingas
 1 gas washer
2 swamp
3 lower nozzle level
4 upper nozzle level
5 collectors
6 flue gas pipe
7 Clean gas line
8 Oxidation air line
9 absorbent container
10 absorbent line
11 suspension line
12 pump
13 suspension line
14 suspension line
15 suspension line
16 pump
17 Oxidation air line
18 flue gas
19 Absorbent suspension
20 oxidation air
21 Absorbent suspension
22 fresh absorbent suspension
23 Oxidation air
24 Absorbent suspension
25 absorbent suspension
26 Absorbent suspension
27 clean gas

Claims (1)

Verfahren zum Betrieb einer Rauchgasentschwefelungsanlage für ein mit fossilen Brennstoffen und/oder Müll betriebenes Kraftwerk mit einem Zweistufen- bzw. Zweikreis-Gaswäscher, wobei in einem Absorptionsmittelbehälter eine Absorptions­ mittel-Suspension hergestellt sowie in den oberen Kreislauf des Gaswäschers gefördert und Oxidationsluft in den unteren Kreislauf des Gaswäschers eingebracht wird, gekennzeichnet dadurch, daß die Oxidationsluft ganz oder teilweise in den Absorpti­ onsmittelbehälter und/oder an anderer geeigneter Stelle in den oberen Kreislauf eingebracht wird.Method for operating a flue gas desulfurization system for a power plant operated with fossil fuels and / or waste with a two-stage or two-circuit gas scrubber, whereby an absorption medium suspension is produced in an absorption medium container and conveyed into the upper circuit of the gas scrubber and oxidizing air into the lower circuit of the gas scrubber is introduced, characterized in that the oxidation air is introduced in whole or in part into the absorption medium container and / or at another suitable point in the upper circuit.
DE19741120A 1997-06-06 1997-09-12 Operation of dual circuit gas scrubber used in flue gas desulphurisation Ceased DE19741120A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19741120A DE19741120A1 (en) 1997-06-06 1997-09-12 Operation of dual circuit gas scrubber used in flue gas desulphurisation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19724801 1997-06-06
DE19741120A DE19741120A1 (en) 1997-06-06 1997-09-12 Operation of dual circuit gas scrubber used in flue gas desulphurisation

Publications (1)

Publication Number Publication Date
DE19741120A1 true DE19741120A1 (en) 1998-12-10

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Application Number Title Priority Date Filing Date
DE19741120A Ceased DE19741120A1 (en) 1997-06-06 1997-09-12 Operation of dual circuit gas scrubber used in flue gas desulphurisation

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059703A1 (en) * 1998-05-16 1999-11-25 Noell-Krc Energie- Und Umwelttechnik Gmbh Method for wet flue gas desulfurization and device for implementing said method
EP3135364A1 (en) * 2015-08-31 2017-03-01 Steinmüller Engineering GmbH Method and device for exhaust gas desulfurization
US9844752B2 (en) 2012-11-29 2017-12-19 Alfa Laval Corporate Ab System, a use of such a system and a multi system for cleaning exhaust gas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059703A1 (en) * 1998-05-16 1999-11-25 Noell-Krc Energie- Und Umwelttechnik Gmbh Method for wet flue gas desulfurization and device for implementing said method
US6555082B1 (en) 1998-05-16 2003-04-29 Babcock Borsig Power Environment Gmbh Method for wet flue gas desulfurization and device for implementing said method
US9844752B2 (en) 2012-11-29 2017-12-19 Alfa Laval Corporate Ab System, a use of such a system and a multi system for cleaning exhaust gas
EP3135364A1 (en) * 2015-08-31 2017-03-01 Steinmüller Engineering GmbH Method and device for exhaust gas desulfurization
WO2017037076A1 (en) * 2015-08-31 2017-03-09 Steinmüller Engineering GmbH Method and device for flue gas desulfurization

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8127 New person/name/address of the applicant

Owner name: VATTENFALL EUROPE GENERATION AG & CO. KG, 10115 BE

8127 New person/name/address of the applicant

Owner name: VATTENFALL EUROPE GENERATION AG & CO. KG, 03050 CO

8131 Rejection