DE3611475A1 - Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants - Google Patents

Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants

Info

Publication number
DE3611475A1
DE3611475A1 DE19863611475 DE3611475A DE3611475A1 DE 3611475 A1 DE3611475 A1 DE 3611475A1 DE 19863611475 DE19863611475 DE 19863611475 DE 3611475 A DE3611475 A DE 3611475A DE 3611475 A1 DE3611475 A1 DE 3611475A1
Authority
DE
Germany
Prior art keywords
iron
iii
flue gases
edta
scrubber
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
DE19863611475
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Heinrich Dipl Ing Igelbuescher
Heinrich Ing Grad Gresch
Heribert Dipl Ing Dewert
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19863611475 priority Critical patent/DE3611475A1/en
Priority to DE19863619495 priority patent/DE3619495A1/en
Priority to DE19863635458 priority patent/DE3635458A1/en
Priority to EP87902485A priority patent/EP0262204A1/en
Priority to PCT/EP1987/000187 priority patent/WO1987005825A1/en
Priority to JP62502453A priority patent/JPS63502971A/en
Publication of DE3611475A1 publication Critical patent/DE3611475A1/en
Ceased legal-status Critical Current

Links

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
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

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

Abstract

It is known to reduce SO2 and NOx in flue gases by scrubber solutions in scrubbers. For this purpose, EDTA-iron complex compounds are used in preferably alkaline scrubbing solutions. In this case intense oxidation of iron(II) to iron(III) is produced by the high atmospheric oxygen content in the flue gas. In order to carry out the reduction from iron(III) to iron(II), reducing agents or electrolytic processes are used. In order to decrease the necessary reducing agent consumption or to avoid the use of electrolysis, according to the invention it is proposed that the scrubbing fluid enriched with EDTA-iron complexes, after contacting with the untreated gas in the scrubber, is stored in a delay vessel having a residence time greater than one hour. The length of the residence time depends on the proportion of the iron (III) to be reduced to iron (II) in the scrubbing fluid.

Description

Es ist bekannt, SO2 und NO x in Rauchgasen mittels Waschlösungen in Wäschern zu reduzieren. Hierbei werden EDTA-Eisenkomplex-Verbindungen in vorzugs­ weise alkalischen Waschlösungen genutzt. Hierbei wird eine starke Eisenoxidation von Eisen III zu Eisen II zwangsläufig durch den hohen Luftsauerstoff im Rauchgas erzeugt.It is known to reduce SO 2 and NO x in flue gases by means of washing solutions in washing machines. Here EDTA iron complex compounds are used in preferential alkaline washing solutions. A strong iron oxidation of iron III to iron II is inevitably generated by the high atmospheric oxygen in the flue gas.

Um die Reduktion von Eisen III zu Eisen II zu ermöglichen, werden Reduktionsmittel oder elektrolytische Vorgänge genutzt.To reduce iron III to iron II enable, reducing agents or electrolytic Processes used.

Der notwendige Reduktionsmittelverbrauch oder der Einsatz der Elektrolyse ist sehr kostenintensiv.The necessary reduction agent consumption or the use electrolysis is very expensive.

Um diese Kosten-Intensität wesentlich zu reduzieren, wird erfindungsgemäß vorgeschlagen, die Waschflüssigkeit in Zwischenbehältern nach dem Kontaktieren der Wasch­ flüssigkeit im Wäscher zwischenzulagern mit einer Ver­ weilzeit größer als 1 Stunde, je nach dem zu reduzieren­ den Eisen III zu Eisen II-Anteil in der Waschflüssig­ keit.To significantly reduce this cost intensity,  is proposed according to the invention, the washing liquid in intermediate containers after contacting the wash store liquid in the scrubber with a Ver because time greater than 1 hour, depending on the reduce the iron III to iron II portion in the washing liquid speed.

Die Reduktion im Verweilzeitbehälter ist zurückzu­ führen über das Sulfit, das in der Waschflüssigkeit enthalten ist. Gleichzeitig erfolgt hier die Reduktion des Nitrosyl-Komplexes (EDTA FeII-NO) zu Sulfat und elementaren Stickstoff.The reduction in the dwell time is back lead over the sulfite that is in the washing liquid is included. At the same time, the reduction takes place here of the nitrosyl complex (EDTA FeII-NO) to sulfate and elemental nitrogen.

Hierdurch wird genügend freies FeII gebildet, so daß in der Kontaktphase mit dem Rohgas im Wäscher wieder eine NO-Aufnahme erfolgen kann über den EDTA-Eisen II- Komplex.This creates enough free FeII so that in the contact phase with the raw gas in the scrubber again NO absorption can take place via the EDTA iron II Complex.

Claims (1)

Verfahren zur Behandlung der Waschflüssigkeit bei der simultanen Waschung von SO2 und NO x dadurch gekennzeichnet, daß die mit EDTA-Eisenkomplexen angereicherte Waschflüssigkeit nach der Kontaktierung mit dem Rohgas im Wäscher in einem Verweilzeit­ behälter gelagert wird mit einer Verweilzeit größer als 1 Stunde.Process for the treatment of the washing liquid in the simultaneous washing of SO 2 and NO x, characterized in that the washing liquid enriched with EDTA iron complexes is stored in a dwell time container after contacting with the raw gas in the scrubber with a dwell time of more than 1 hour.
DE19863611475 1986-04-05 1986-04-05 Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants Ceased DE3611475A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19863611475 DE3611475A1 (en) 1986-04-05 1986-04-05 Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants
DE19863619495 DE3619495A1 (en) 1986-04-05 1986-06-10 Process for treating scrubbing liquid in the simultaneous SO2/NOx purification of flue gases
DE19863635458 DE3635458A1 (en) 1986-04-05 1986-10-18 Process for separating off SO2 and NOx and return of residues to the coal waiting for combustion
EP87902485A EP0262204A1 (en) 1986-04-05 1987-04-04 PROCESS FOR TREATING THE WASHING LIQUID DURING REMOVAL OF SO 2? AND NO x? FROM FLUE GASES
PCT/EP1987/000187 WO1987005825A1 (en) 1986-04-05 1987-04-04 PROCESS FOR TREATING THE WASHING LIQUID DURING REMOVAL OF SO2 AND NOx FROM FLUE GASES
JP62502453A JPS63502971A (en) 1986-04-05 1987-04-04 Processing method for cleaning liquid when removing SO↓2 and NOx from waste gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863611475 DE3611475A1 (en) 1986-04-05 1986-04-05 Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants

Publications (1)

Publication Number Publication Date
DE3611475A1 true DE3611475A1 (en) 1987-10-15

Family

ID=6298030

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863611475 Ceased DE3611475A1 (en) 1986-04-05 1986-04-05 Simultaneous SO2 and NOx separation in flue gases downstream of combustion plants

Country Status (1)

Country Link
DE (1) DE3611475A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625005A1 (en) * 1975-06-03 1976-12-23 Mitsui Petrochemical Ind METHOD OF REMOVING NO TIEF 2 FROM A NO TIEF 2 CONTAINING WASTE GAS
DE3419611A1 (en) * 1984-05-25 1985-11-28 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous scrubbing of SO2 and NOx from exhaust gases downstream of combustion plants

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625005A1 (en) * 1975-06-03 1976-12-23 Mitsui Petrochemical Ind METHOD OF REMOVING NO TIEF 2 FROM A NO TIEF 2 CONTAINING WASTE GAS
DE3419611A1 (en) * 1984-05-25 1985-11-28 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous scrubbing of SO2 and NOx from exhaust gases downstream of combustion plants

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