DE3540973A1 - Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl - Google Patents

Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl

Info

Publication number
DE3540973A1
DE3540973A1 DE19853540973 DE3540973A DE3540973A1 DE 3540973 A1 DE3540973 A1 DE 3540973A1 DE 19853540973 DE19853540973 DE 19853540973 DE 3540973 A DE3540973 A DE 3540973A DE 3540973 A1 DE3540973 A1 DE 3540973A1
Authority
DE
Germany
Prior art keywords
iron
nox
hcl
flue gases
scrubbing
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
Application number
DE19853540973
Other languages
German (de)
Other versions
DE3540973C2 (en
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
Priority claimed from DE19843447425 external-priority patent/DE3447425A1/en
Application filed by Individual filed Critical Individual
Priority to DE19853540973 priority Critical patent/DE3540973A1/en
Priority to PCT/EP1986/000572 priority patent/WO1987002269A1/en
Priority to EP86905803A priority patent/EP0241496A1/en
Publication of DE3540973A1 publication Critical patent/DE3540973A1/en
Application granted granted Critical
Publication of DE3540973C2 publication Critical patent/DE3540973C2/de
Granted 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
    • 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
    • B01D53/68—Halogens or halogen compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
    • 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 is known, downstream of combustion boilers of fossil-fuelled power stations, to scrub out SO2 and NOx simultaneously from the flue gases by iron chelate solutions. In the case of flue gases having comparatively high HCl loads, it is known to provide acidic HCl scrubbing upstream of the actual simultaneous scrubber. A disadvantage in this case is that the chloride loads which occur in the acidic stage must be evaporated since they are not passed on to an outfall. However, the evaporation is relatively complex and additionally introduces a landfill problem. In order to avoid these disadvantages, according to the invention it is proposed that the flue gases are scrubbed with iron chelate complex salts, which occur in the scrubbing solution, and the scrubbing solution is passed via an electrolysis cell and a part of the iron chelate complex salt is reduced from iron III to iron II and simultaneously the alkali metal chlorides in the scrubbing solution are decomposed by appropriate control of the current strength, chlorine gas forming at the anode and, in the scrubbing circulation, alkali metal hydroxide (for example NaOH), which serves in the circulation for the absorption of SO2/NOx and HCl from the flue gas.

Description

Es ist bekannt, daß hinter fossilen Kraftwerken SO2 und NO x simultan durch Eisenchelatlösungen ausgewaschen werden können.It is known that SO 2 and NO x can be washed out simultaneously by iron chelate solutions behind fossil power plants.

Jedoch dann, wenn hohe HCl-Belastungen im Rohgas vorliegen, wird dem eigentlichen Simultan-Wäscher, der mit Eisenchelatkomplexen betrieben wird, eine saure HCl-Wäsche vorgeschaltet.However, when there are high levels of HCl in the raw gas the actual simultaneous washer, operated with iron chelate complexes, a acidic HCl wash upstream.

Diese Belastungen von Chlorid, die in der sauren Stufe anfallen, müssen in der Regel, da sie dem Vorfluter nicht übergeben werden können, eingedampft werden. These strains of chloride in the acid Level incurred usually need to be as the receiving water can not be passed, evaporated will.  

Das Eindampfen ist a) sehr teuer und b) entsteht zusätzlich ein Deponieproblem.Evaporation is a) very expensive and b) arises additionally a landfill problem.

Um den Vorwäscher zu vermeiden und gleichzeitig das Eindampfen zu vermeiden, wird erfindungsgemäß vorgeschlagen, in nur einer einzigen Waschstufe, die simultan zur Waschung von SO2 und NO x mit Eisenchelatkomplexen betrieben wird, so zu steuern, daß die gesamte Waschflüssigkeit über die Elektrolyse gepumpt wird, so daß die in der Lösung befindlichen Alkali-Chloride zersetzt werden und sich an der Anode Chlorgas bildet, und die Alkalimetalle zu Alkalihydroxid in der Lösung als Reststoff verbleiben, und somit für die simultane Waschung von SO2 und NO x ein Alkalikreislauf für die SO2-Wäsche gebildet wird und kein Abwasser abgegeben zu werden braucht. Eine Aufsalzung ist somit ausgeschlossen.In order to avoid the pre-washer and at the same time to avoid evaporation, it is proposed according to the invention to control in only one washing step, which is operated simultaneously with SO 2 and NO x with iron chelate complexes, in such a way that the entire washing liquid is pumped via the electrolysis , so that the alkali chlorides in the solution are decomposed and chlorine gas forms at the anode, and the alkali metals to alkali hydroxide remain in the solution as a residue, and thus an alkali cycle for the SO to wash SO 2 and NO x simultaneously 2 laundry is formed and no waste water needs to be released. Salting is therefore excluded.

Die Chlorgase werden aufgefangen und einer Verwertung zugeführt. The chlorine gases are collected and recycled fed.  

Selbstverständlich ist die Erfindung nicht auf die vorstehend im einzelnen beschriebenen Ausbildungsformen beschränkt, sondern es sind zahlreiche Abänderungen möglich, ohne jedoch von dem Grundgedanken abzuweichen, eine Waschflüssigkeit mit einer Eisenchelatkomplexverbindung ohne Vorschaltung einer Chloridwäsche in einem einzelnen Wäscher zu nutzen, wobei die Waschflüssigkeit in Teilmengen einer Elektrolyse zugeführt wird, in der das Eisen-(III) zu Eisen-(II) reduziert wird, und gleichzeitig die Stromstärke so gefahren wird, daß praktisch das Alkalichlorid gespalten und zu Chlorgas zersetzt wird, wobei das Chlorgas aufgefangen und einer Verwertung zugeführt werden kann, und das Alkalihydroxid für die Waschung von SO2 aus dem Rauchgas genutzt wird.Of course, the invention is not limited to the embodiments described in detail above, but numerous modifications are possible without, however, deviating from the basic idea of using a washing liquid with an iron-chelate complex compound without the addition of a chloride wash in a single washer, the washing liquid in partial amounts of one Electrolysis is supplied, in which the iron (III) is reduced to iron (II), and at the same time the current is driven in such a way that the alkali metal chloride is practically split and decomposed to chlorine gas, the chlorine gas being able to be collected and recycled , and the alkali hydroxide is used for washing SO 2 from the flue gas.

Claims (1)

Verfahren zur Reinigung von chlorhaltigen, SO2-haltigen und NO x -haltigen Abgasen nach Patentanmeldung P 34 47 425.0 dadurch gekennzeichnet, daß sie mit Eisenchelatkomplexsalzen, die sich in der Waschlösung befinden, gewaschen werden, und die Waschlösung über eine Elektrolysezelle geleitet wird und ein Teil des Eisenchelatkomplexsalzes von Eisen-III zu Eisen-II reduziert wird und gleichzeitig die Alkalichloride in der Waschlösung durch entsprechende Fahrung der Stromstärke zersetzt werden, wobei sich an der Anode Chlorgas bildet und in dem Waschkreislauf Alkalihydroxid (z. B. NaOH), das im Kreislauf gefahren zur So2/NO x - und HCl- Absorption aus dem Rauchgas dient.Process for cleaning chlorine-containing, SO 2 -containing and NO x -containing exhaust gases according to patent application P 34 47 425.0, characterized in that they are washed with iron chelate complex salts which are in the washing solution, and the washing solution is passed through an electrolysis cell and a Part of the iron chelate complex salt is reduced from iron-III to iron-II and at the same time the alkali chlorides in the washing solution are decomposed by driving the current accordingly, chlorine gas forms at the anode and alkali metal hydroxide (e.g. NaOH) in the washing circuit Circulated for So 2 / NO x and HCl absorption from the flue gas.
DE19853540973 1984-12-24 1985-11-19 Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl Granted DE3540973A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853540973 DE3540973A1 (en) 1984-12-24 1985-11-19 Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl
PCT/EP1986/000572 WO1987002269A1 (en) 1985-10-11 1986-10-08 Process for simultaneous extraction of so2 and nox contained in waste gases
EP86905803A EP0241496A1 (en) 1985-10-11 1986-10-08 Process for simultaneous extraction of so 2? and no x? contained in waste gases

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843447425 DE3447425A1 (en) 1984-12-24 1984-12-24 Electrochemical process for purifying exhaust gases
DE19853540973 DE3540973A1 (en) 1984-12-24 1985-11-19 Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl

Publications (2)

Publication Number Publication Date
DE3540973A1 true DE3540973A1 (en) 1987-05-21
DE3540973C2 DE3540973C2 (en) 1988-06-30

Family

ID=25827789

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853540973 Granted DE3540973A1 (en) 1984-12-24 1985-11-19 Simultaneously separating off SO2 and NOx from flue gases which are highly loaded with NOx and HCl

Country Status (1)

Country Link
DE (1) DE3540973A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667179A1 (en) * 1990-06-25 1995-08-16 Mitsubishi Jukogyo Kabushiki Kaisha Method for desulfurizing exhaust smoke
CN107522297A (en) * 2017-09-15 2017-12-29 北京高能时代环境技术股份有限公司 A kind of system that desulfurization wastewater softening is carried out using flue gas

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3921180A1 (en) * 1989-06-28 1991-01-03 Gsb Ges Zur Beseitigung Von So METHOD AND SYSTEM FOR THE PURIFICATION OF POLLUTANT-BASED EXHAUST GASES WITH AVOIDANCE OF SALT RESIDUES
DE4033489A1 (en) * 1990-10-20 1992-04-23 Kernforschungsz Karlsruhe Chlorine and hydrogen recovery from smoke from waste combustion - by sepg. fly ash, scrubbing gas, neutralising circulating scrubbing liquor contg. hydrochloric acid and electrolysing

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3941667A (en) * 1975-03-21 1976-03-02 Friedrich Uhde Gmbh Method for the reprocessing of cell liquor from diaphragm cell electrolysis plants
DE2604371A1 (en) * 1975-02-07 1976-08-26 Andco Inc METHOD FOR ELECTROCHEMICAL REMOVAL OF POLLUTING IONS FROM AN IONIZING MEDIUM AND ELECTROCHEMICAL CELL FOR CARRYING OUT THE METHOD
CH585582A5 (en) * 1972-09-15 1977-03-15 Dart Ind Inc
DE2710328A1 (en) * 1976-03-09 1977-09-15 Solex Res Corp Japan PROCESS FOR RECOVERY OF USED SULFURIC ACID AND HYDROCHLORIC ACID
DD131041A1 (en) * 1977-01-31 1978-05-24 Elisabeth Gerber PROCESS FOR THE PREPARATION OF IRON CHLORIDE SALT SAW ELISA
DE3110320A1 (en) * 1980-03-17 1982-01-07 National Research Development Corp., London ANODE SUPPORTED CATION REDUCTION

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH585582A5 (en) * 1972-09-15 1977-03-15 Dart Ind Inc
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
DE2604371A1 (en) * 1975-02-07 1976-08-26 Andco Inc METHOD FOR ELECTROCHEMICAL REMOVAL OF POLLUTING IONS FROM AN IONIZING MEDIUM AND ELECTROCHEMICAL CELL FOR CARRYING OUT THE METHOD
US3941667A (en) * 1975-03-21 1976-03-02 Friedrich Uhde Gmbh Method for the reprocessing of cell liquor from diaphragm cell electrolysis plants
DE2710328A1 (en) * 1976-03-09 1977-09-15 Solex Res Corp Japan PROCESS FOR RECOVERY OF USED SULFURIC ACID AND HYDROCHLORIC ACID
DD131041A1 (en) * 1977-01-31 1978-05-24 Elisabeth Gerber PROCESS FOR THE PREPARATION OF IRON CHLORIDE SALT SAW ELISA
DE3110320A1 (en) * 1980-03-17 1982-01-07 National Research Development Corp., London ANODE SUPPORTED CATION REDUCTION

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Z: Chem.-Ing.Techn., 57, 1985, Nr.9, S.717-727 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0667179A1 (en) * 1990-06-25 1995-08-16 Mitsubishi Jukogyo Kabushiki Kaisha Method for desulfurizing exhaust smoke
CN107522297A (en) * 2017-09-15 2017-12-29 北京高能时代环境技术股份有限公司 A kind of system that desulfurization wastewater softening is carried out using flue gas

Also Published As

Publication number Publication date
DE3540973C2 (en) 1988-06-30

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