DE3515707A1 - Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations - Google Patents

Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations

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Publication number
DE3515707A1
DE3515707A1 DE19853515707 DE3515707A DE3515707A1 DE 3515707 A1 DE3515707 A1 DE 3515707A1 DE 19853515707 DE19853515707 DE 19853515707 DE 3515707 A DE3515707 A DE 3515707A DE 3515707 A1 DE3515707 A1 DE 3515707A1
Authority
DE
Germany
Prior art keywords
nox
scrubbing
flue gas
fossil
gas purification
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
DE19853515707
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German (de)
Other versions
DE3515707C2 (en
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 DE19853515707 priority Critical patent/DE3515707A1/en
Priority to EP86902811A priority patent/EP0217945A1/en
Priority to PCT/EP1986/000207 priority patent/WO1986005709A1/en
Publication of DE3515707A1 publication Critical patent/DE3515707A1/en
Application granted granted Critical
Publication of DE3515707C2 publication Critical patent/DE3515707C2/de
Granted 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
    • B01D53/68—Halogens or halogen compounds
    • 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

The main application P3514407.6 relates to a process for the simultaneous scrubbing of SO2 and NOx in which in a scrubbing stage, upstream of the NOx scrubber, the SO2 is preferably scrubbed out using limestone or hydrated lime until a defined stoichiometric ratio is achieved. In order to further improve the process, according to the abovementioned patent application, it is proposed according to the invention that a reducing agent, preferably sodium dithionite, is added to the scrubbing liquid and the scrubbing liquid is contacted with the crude gas, which is enriched with SO2 and NOx, preferably in the scrubber, until a saturation of the sodium sulphate formed is almost established at about 200 g/l in the scrubbing solution.

Description

Beschreibung und Erläuterung zur ZusatzpatentanmeldungDescription and explanation of the additional patent application

"Ein- und/oder mehrstufiges HCl-, SO2- und NOx-Waschverfahren für die Rauchgasreinigung vorzugsweise hinter fossilen Kraftwerken Zusatzanmeldung zu P 35 14 407.6 In der Anmeldung P 35 14 407.6 wird ein Verfahren zur Waschung von vorzugsweise SO2 und NOx beschrieben, in dem in einer dem NOx-Wäscher vorgesetzten Waschstufe das SO, vorzugsweise mit Kalkstein oder Kalkhydrat so weit ausgewaschen wird, daß sich im Rauchgas vor der letzten Waschstufe ein stöchiometrisches SO/NO-Verhältnis von 2 : 1 einstellt und sich gleichzeitig SO2 und NOxgut auswaschen lassen. Gleichzeitig wird zur Verstärkung des Eisen-Il-Komplexes, dh. zur Erhaltung des Fe-Il-Komplexes (zur Verhinderung der Oxidation von Fe++ zu Fe+++) Natriumdithionit der Waschflüssigkeit zugesetzt und zur Eigenverbesserung des Redox-Potentials im negativen Bereich Natriumsulfit und/oder Pyrosulfit angewandt, wobei das Natriumsulfit auf größer als 20 g/l in der Waschflüssigkeit eingestellt wird, und dieses bevorzugt bei NO -Konzentration bis 800 mg/Nm3 und bei steigender NOx-Konzentration im Rohgas die Natriumsulfit-Konzentration im Waschwasser z.B. bis zu 100 Liter gesteigert werden kann."Single and / or multi-stage HCl, SO2 and NOx scrubbing processes for the flue gas cleaning preferably behind fossil power plants additional registration P 35 14 407.6 In the application P 35 14 407.6 a method for washing of preferably SO2 and NOx described in the one in front of the NOx scrubber Wash stage the SO, preferably washed out with limestone or hydrated lime that there is a stoichiometric SO / NO ratio in the flue gas before the last scrubbing stage of 2: 1 and at the same time the SO2 and NOx can be washed out. Simultaneously is used to strengthen the iron-II complex, ie. to maintain the Fe-II complex (to prevent the oxidation of Fe ++ to Fe +++) Sodium dithionite in the washing liquid added and for self improvement of the redox potential in the negative Range sodium sulfite and / or pyrosulfite applied, the sodium sulfite on greater than 20 g / l is set in the washing liquid, and this is preferred with NO concentration up to 800 mg / Nm3 and with increasing NOx concentration in the raw gas the sodium sulphite concentration in the washing water increased e.g. up to 100 liters can be.

Erfindungsgemäß wurde gefunden, daß nicht nur der Anteil an Natriumsulfit im Waschwasser die aus schlaggebende Rolle für die NOx-Abscheidung bildet.According to the invention it was found that not only the proportion of sodium sulfite forms the decisive role for NOx separation in the washing water.

Unter Beibehaltung des erfindungsgemäßen Gedankens, ein Reduktionsmittel der Waschflüssigkeit zuzusetzen, wie z.B. Dithionit, und zur Maskierung von Eisen-Ill und zur Verhinderung der Oxidation von Eisen-Il zu Eisen-Ill außerdem Weinsäure zuzusetzen, wurde gefunden, daß der Natriumsulfatgehalt in der Waschlösung, gebildet durch Reduktion mittels Natriumsulfit des von der Eisen-Il-Chelatlösung aufgenommenen Stickstoffmonoxids zu elementaren Stickstoff und Natriumsulfat vorzugsweise bis zur Sättigungsgrenze angereichert wird, wobei gefunden wurde, daß das zugegebene Reduktionsmittel wesentlich geringer an der Oxidation teilnimmt und infolgedessen aktiv erhalten bleibt, und mit z.B. weniger als 0,5 g Natriumdithionit-Zugabe pro Liter Waschflüssigkeit eine Auswaschung -Rohgasbelastung 1600 mg NO/Nm3 auf 100 mg NO/Nm3 -erzielt werden konnte bei einer Waschflüssigkeitsmenge von 3 Liter/Nm3 Rohgas.While maintaining the idea according to the invention, a reducing agent add to the washing liquid, such as dithionite, and to mask iron III and tartaric acid to prevent the oxidation of iron (II) to iron (III) adding, it was found that the sodium sulfate content in the washing solution formed by reduction by means of sodium sulfite of the absorbed by the iron-II-chelate solution Nitric oxide to elemental nitrogen and sodium sulfate preferably up to is enriched to the saturation limit, which was found to be the added Reducing agent takes part in the oxidation much less and is therefore actively maintained remains, and with, for example, less than 0.5 g sodium dithionite addition per liter of washing liquid a leaching - raw gas pollution 1600 mg NO / Nm3 to 100 mg NO / Nm3 - can be achieved could with a scrubbing liquid quantity of 3 liters / Nm3 raw gas.

Durch diese erfindungsgemäße Maßnahme und Reduktionsmittel-Zugabe ist eine Rauchgasreinigung von SO, und NOx wesentlich preiswerter zu gestalten, als es bis zum Zeitpunkt dieser Bindung möglich war.By this measure according to the invention and the addition of reducing agent a flue gas cleaning of SO and NOx is to be made much cheaper, than was possible at the time of this bond.

Claims (1)

Zusatz-Patentanspruch: Verfahren zur simultanen Waschung von SO, und NO dadurch gekennzeichnet, daß der Waschflüssigkeit ein Reduktionsmittel, vorzugsweise Natriumdithionit, zugesetzt wird, und die Waschflüssigkeit so lange mit dem Rohgas, das mit S02 und NOX angereichert ist, in Kontakt gebracht wird, vorzugsweise im Wäscher, bis daß nahezu eine Sättigung des sich bildenden Natriumsulfats um etwa 200 g/l in der Waschlösung sich einstellt.Additional claim: Process for the simultaneous washing of SO, and NO characterized in that the washing liquid is a reducing agent, preferably Sodium dithionite, is added, and the scrubbing liquid with the raw gas for so long, which is enriched with SO2 and NOX, is brought into contact, preferably im Washer until almost a saturation of the sodium sulfate formed by about 200 g / l is established in the washing solution.
DE19853515707 1985-04-06 1985-05-02 Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations Granted DE3515707A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853515707 DE3515707A1 (en) 1985-05-02 1985-05-02 Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations
EP86902811A EP0217945A1 (en) 1985-04-06 1986-04-05 Process for the cleansing of fumes
PCT/EP1986/000207 WO1986005709A1 (en) 1985-04-06 1986-04-05 Process for the cleansing of fumes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853515707 DE3515707A1 (en) 1985-05-02 1985-05-02 Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations

Publications (2)

Publication Number Publication Date
DE3515707A1 true DE3515707A1 (en) 1986-11-06
DE3515707C2 DE3515707C2 (en) 1992-12-03

Family

ID=6269586

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853515707 Granted DE3515707A1 (en) 1985-04-06 1985-05-02 Single-and/or multiple-stage HCl-, SO2- and NOx-scrubbing process for flue gas purification, preferably downstream of fossil-fuel power stations

Country Status (1)

Country Link
DE (1) DE3515707A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2460231A1 (en) * 1973-12-27 1975-07-03 Chisso Eng Co Ltd PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM INDUSTRIAL EXHAUST GASES AND SUITABLE AQUATIC TREATMENT SOLUTIONS

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2460231A1 (en) * 1973-12-27 1975-07-03 Chisso Eng Co Ltd PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM INDUSTRIAL EXHAUST GASES AND SUITABLE AQUATIC TREATMENT SOLUTIONS

Also Published As

Publication number Publication date
DE3515707C2 (en) 1992-12-03

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