DE3447519A1 - Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid - Google Patents

Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid

Info

Publication number
DE3447519A1
DE3447519A1 DE19843447519 DE3447519A DE3447519A1 DE 3447519 A1 DE3447519 A1 DE 3447519A1 DE 19843447519 DE19843447519 DE 19843447519 DE 3447519 A DE3447519 A DE 3447519A DE 3447519 A1 DE3447519 A1 DE 3447519A1
Authority
DE
Germany
Prior art keywords
electrolysis
nox
scrubbing liquid
formic acid
added
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.)
Withdrawn
Application number
DE19843447519
Other languages
German (de)
Inventor
Heribert Dipl.-Ing. 4390 Gladbeck Dewert
Heinrich Ing.(grad.) 4600 Dortmund Gresch
Heinz Dipl.-Ing. Hölter
Heinrich Dipl.-Ing. 4390 Gladbeck Igelbüscher
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 DE19843447519 priority Critical patent/DE3447519A1/en
Priority to PCT/EP1985/000018 priority patent/WO1985003238A2/en
Priority to AU38857/85A priority patent/AU569775B2/en
Priority to EP85900664A priority patent/EP0168453A1/en
Priority to US06/781,235 priority patent/US4670234A/en
Priority to IT19231/85A priority patent/IT1199650B/en
Publication of DE3447519A1 publication Critical patent/DE3447519A1/en
Withdrawn legal-status Critical Current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

Abstract

It has already been proposed, for adjusting the redox potential and for stabilising the iron chelate solution, in addition to the accompanying additives, to incorporate electrolysis into the process in place of sodium dithionite. According to the invention it is proposed that limestone and/or hydrated lime with addition of NTA and/or EDTA are added to the scrubbing liquid, the scrubbing liquid is conducted with sodium dithionite over an iron reactor and, if there is a negative balance between SO2 and NOx, pyrosulphite is added to the scrubbing liquid and for stabilising the discharge - in particular of the iron chelate - acids are fed in, preferably formic acid, and for rapid adjustment of the scrubbing liquid in the region of the desired redox potential, an electrolysis is connected intermediately in the scrubbing liquid circulation.

Description

Beschreibung und Erläuterung zur Zusatzpatent-Description and explanation of the additional patent

anmeldung "Verfahren zur simultanen Waschung von S02 und NOx unter Verwendung einer Elektrolyse und Zuführung von Ameisensäure" In der Hauptanmeldung wird ein Verfahren beschrieben, in dem zur Einstellung des Redoxpotentials und zur Stabilisierung der Eisenchelatlösung zusätzlich zu den beigegebenen Additiven anstelle von Natriumdithionit eine Elektrolyse im Prozeß eingeschaltet ist.registration "procedure for the simultaneous washing of S02 and NOx under Use of electrolysis and supply of formic acid "In the main application a method is described in which to adjust the redox potential and to Stabilization of the iron chelate solution in addition to the additives instead electrolysis is switched on in the process by sodium dithionite.

Nachstehend wird weiter erfindungsgemäß beschrieben, daß der bei der S02- und NOx-Abscheidung erfindungsgemäß angewandte Prozeß so gesteuert wird, daß bei nicht genügend hohem S02-Gehalt im Verhältnis zum NO -Gehalt Pyrosulfit für die Differenz von S02 zu NOx dosiert dem Waschprozeß zugegeben wird bei gleichzeitiger Zugabe von Kalkstein und/oder Ealkhydrat und Zugabe von NTA oder MEDIA, und zur Steuerung des Redoxpotentials ein Eisenreaktor im Waschflüssigkeitskreislauf eingeschaltet ist, wobei zur Stabilisierung des Redoxpotentials bei gleichzeitiger Verbesserung der Löslichkeit von Kalkstein und/oder Kalkhydrat und zur gleichzeitigen Stabilisierung des Eisenchelats eine Säure, vorzugsweise Ameisensäure, zugesetzt wird, und zur schnelleren Steuerung des Redoxpotentials in der Flüssigkeitsmenge eine entsprechende Flüssigkeitsmenge über eine Elektrolyse geleitet wird.In the following it is further described according to the invention that the in the SO2 and NOx separation process used according to the invention is controlled so that if the S02 content is not high enough in relation to the NO content Pyrosulfite for the difference between SO2 and NOx is dosed and added to the washing process with simultaneous addition of limestone and / or Ealkhydrat and addition of NTA or MEDIA, and an iron reactor in the washing liquid circuit to control the redox potential is switched on, with simultaneous stabilization of the redox potential Improving the solubility of limestone and / or hydrated lime and at the same time An acid, preferably formic acid, is added to stabilize the iron chelate and for faster control of the redox potential in the amount of liquid a corresponding amount of liquid is passed through an electrolysis.

Durch diese Maßnahme ist der Prozeß sehr schnell der Aufgabenstellung anpaßbar.With this measure, the process is very quick to set the task customizable.

Zusatz-Patentanspruch: Additional claim:

Claims (1)

Zusatz-Patentanspruch: Anspruch 1 Verfahren zur simultanen Waschung von S02 und NOx dadurch gekennzeichnet, daß die Waschflüssigkeit mit Kalkstein und/oder Kalkhydrat unter Zusatz von NTA und/oder EDTA versetzt mit Natriumdithionit über einen Eisenreaktor geführt wird, und bei negativer Bilanz zwischen S02 und NOx der Waschflüssigkeit Pyrosulfit zugesetzt wird und zur Stabilisierung des Ablaufes - insbesondere des Eisenchelats - Säuren zugeführt werden, vorzugsweise Ameisensäure, und zur Schnelleinstellung der Waschflüssigkeit im Bereich des gewünschten Redoxpotentials eine Elektrolyse im Waschflüssigkeitskreislauf zwischengeschaltet wird.Additional claim: Claim 1 method for simultaneous washing of S02 and NOx characterized in that the washing liquid with limestone and / or Lime hydrate with the addition of NTA and / or EDTA mixed with sodium dithionite an iron reactor is performed, and with a negative balance between S02 and NOx the Washing liquid pyrosulfite is added and to stabilize the drain - in particular of the iron chelate - acids are added, preferably formic acid, and for quick adjustment of the washing liquid in the range of the desired redox potential an electrolysis is interposed in the washing liquid circuit.
DE19843447519 1984-01-25 1984-12-27 Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid Withdrawn DE3447519A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19843447519 DE3447519A1 (en) 1984-12-27 1984-12-27 Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid
PCT/EP1985/000018 WO1985003238A2 (en) 1984-01-25 1985-01-23 Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants
AU38857/85A AU569775B2 (en) 1984-01-25 1985-01-23 Stripping nox and sox from flue gases discharged from combustion plants
EP85900664A EP0168453A1 (en) 1984-01-25 1985-01-23 Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants
US06/781,235 US4670234A (en) 1984-01-25 1985-01-23 Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants
IT19231/85A IT1199650B (en) 1984-01-25 1985-01-25 PROCEDURE FOR THE SEPARATION OF NITROGEN OXIDES AND SULFUR OXIDS AND EVENTUALLY OF OTHER HARMFUL SUBSTANCES FROM THE COMBUSTION GASES OF COMBUSTION PLANTS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843447519 DE3447519A1 (en) 1984-12-27 1984-12-27 Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid

Publications (1)

Publication Number Publication Date
DE3447519A1 true DE3447519A1 (en) 1986-07-10

Family

ID=6253963

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843447519 Withdrawn DE3447519A1 (en) 1984-01-25 1984-12-27 Process for simultaneous scrubbing of SO2 and NOx using electrolysis and feeding formic acid

Country Status (1)

Country Link
DE (1) DE3447519A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3610364A1 (en) * 1986-03-27 1987-10-01 Kernforschungsz Karlsruhe METHOD FOR REDUCING THE NO (ARROW DOWN) X (ARROW DOWN) CONTENT IN GASES TO WHICH NH (ARROW DOWN) 3 (ARROW DOWN) IS CONTINUOUSLY ADDED TO THE GAS FLOW
DE3706671A1 (en) * 1987-03-02 1988-09-15 Hoelter Heinz Process for the utilisation of EDTA-iron complex compounds for simultaneously separating off SO2 and NOx
DE3711788A1 (en) * 1987-03-02 1988-10-27 Hoelter Heinz Stabilisation of Na4-EDTA-iron(II) complex compounds in dry form for use for simultaneous SO2/NOx wet scrubbers downstream of combustion plants, in particular heating and power stations

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1046973A (en) * 1962-06-08 1966-10-26 North Western Gas Board Improvements relating to process for electrolytically regenerating alkaline wash solutions used for removing hydrogen sulphide
DE2353528A1 (en) * 1972-10-25 1974-05-16 Hitachi Ltd Treating waste gases to remove nitrogen- and sulphur oxides - without the formation of nitric acid derivs
DE2416660A1 (en) * 1973-04-09 1974-10-24 Mitsui Petrochemical Ind PROCEDURE FOR THE REMOVAL OF NITROGEN OXYDE FROM A GAS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1046973A (en) * 1962-06-08 1966-10-26 North Western Gas Board Improvements relating to process for electrolytically regenerating alkaline wash solutions used for removing hydrogen sulphide
DE2353528A1 (en) * 1972-10-25 1974-05-16 Hitachi Ltd Treating waste gases to remove nitrogen- and sulphur oxides - without the formation of nitric acid derivs
DE2416660A1 (en) * 1973-04-09 1974-10-24 Mitsui Petrochemical Ind PROCEDURE FOR THE REMOVAL OF NITROGEN OXYDE FROM A GAS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3610364A1 (en) * 1986-03-27 1987-10-01 Kernforschungsz Karlsruhe METHOD FOR REDUCING THE NO (ARROW DOWN) X (ARROW DOWN) CONTENT IN GASES TO WHICH NH (ARROW DOWN) 3 (ARROW DOWN) IS CONTINUOUSLY ADDED TO THE GAS FLOW
DE3706671A1 (en) * 1987-03-02 1988-09-15 Hoelter Heinz Process for the utilisation of EDTA-iron complex compounds for simultaneously separating off SO2 and NOx
DE3711788A1 (en) * 1987-03-02 1988-10-27 Hoelter Heinz Stabilisation of Na4-EDTA-iron(II) complex compounds in dry form for use for simultaneous SO2/NOx wet scrubbers downstream of combustion plants, in particular heating and power stations

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