DE3430017A1 - Simultaneous SO2 and NOx scrubbing with addition of metallic iron outside the oxidation phase - Google Patents

Simultaneous SO2 and NOx scrubbing with addition of metallic iron outside the oxidation phase

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Publication number
DE3430017A1
DE3430017A1 DE19843430017 DE3430017A DE3430017A1 DE 3430017 A1 DE3430017 A1 DE 3430017A1 DE 19843430017 DE19843430017 DE 19843430017 DE 3430017 A DE3430017 A DE 3430017A DE 3430017 A1 DE3430017 A1 DE 3430017A1
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DE
Germany
Prior art keywords
iron
scrubbing
metallic iron
added
liquid
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Withdrawn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
DE19843430017
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
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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 DE19843430017 priority Critical patent/DE3430017A1/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
Priority to DD85272832A priority patent/DD233949A5/en
Publication of DE3430017A1 publication Critical patent/DE3430017A1/en
Withdrawn legal-status Critical Current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
    • B01D53/60—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

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  • 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 separate out SO2 and NOx in a scrubbing solution in a single scrubber or in multistage scrubbers, in which the scrubbing solution is enriched with limestone, white lime powder, EDTA and/or a polycarboxylic acid. Since the simultaneous separation does not proceed in harmony, there are high oxidation rates of iron(II) to iron(III) and thus an inactivation of the complex. In order to reactivate the complex portion, according to the main application P 3429663.8 it is proposed to feed the scrubbing liquid, after contacting with SO2 and NOx, via the outlet of the scrubbing liquid vessel (3) to a solids/liquid separation stage (7) which feeds the separated scrubbing liquid to the activator vessel (8) in which reducing agents (9) are added and, after activation, the scrubbing liquid is returned to the scrubbing liquid vessel (11) by means of a pump (10) and/or is directly reintroduced into the scrubbing process via nozzle pairs (5). In a further development of the teaching of the main application, according to the invention it is proposed that reducing additives and/or metallic iron, such as iron powder, iron filings and other embodiments of metallic iron, are added into the reaction vessel (8), the reducing additives being added in the acidic phase, preferably at a pH below 6. <IMAGE>

Description

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

~Simultane 502 und NOx-Waschung mit Zugabe von metallischem Eisen außerhalb der Oxidationsphase' Zusatz zur Anmeldung 'Simultane 502 und NO##Waschung' mit Antrag vom 10.8.1984 (Aktenzeichen liegt noch nicht vor) In der Haupt anmeldung wird ein Verfahren zur simultanen 502 und NOx-Waschung beschrieben.~ Simultaneous 502 and NOx washing with addition of metallic iron outside the oxidation phase 'Addition to the registration' Simultaneous 502 and NO ## washing ' with application dated August 10, 1984 (file number is not yet available) in the main registration describes a method for simultaneous 502 and NOx scrubbing.

Wesentliches Merkmal ist der Einsatz von reduzierenden Additiven in einem Reaktionsbehälter, der dem Waschflüssigkeitskreislaufbehälter nachgeschaltet ist.The main feature is the use of reducing additives in a reaction tank, which is connected downstream of the washing liquid circuit tank is.

Erfindungsgemäß wird weiter vorgeschlagen, im Bereich des Reaktionsbehälters, in dem reduzierende Additive zugegeben werden, metallisches Eisen zuzusetzen - in Form von z.B. Eisenpulver, Eisenspänen usw., bevorzugt in saurer Flüssigkeit, vorzugsweise pH-Wert kleiner 6 In der beiliegenden Zeichnung ist der erfindungsgemäße Gedanke dargestellt: mit (1) das 802- und NOx-haltige Rohgas; mit (2) die Wäschereinrichtung; mit (3) der Waschwassersumpf; mit (4) die Umlaufpumpe zu den Düsenebenen (5); mit (6) der Ablauf aus dem Umlauf-W'asserbehälter (3) zur Entwässerungsstation (7).According to the invention it is further proposed that in the area of the reaction vessel, by adding reducing additives, adding metallic iron - in Form of e.g. iron powder, iron filings, etc., preferably in acidic liquid, preferably pH value less than 6 The idea according to the invention is shown in the accompanying drawing shown: with (1) the raw gas containing 802 and NOx; with (2) the Laundry facility; with (3) the wash water sump; with (4) the circulation pump to the Nozzle planes (5); with (6) the drain from the circulation water tank (3) to the drainage station (7).

Von der Entwässerungsstation (7) wird eine Teilwassermenge in den Regenerationsbehälter (8) übergeben.From the drainage station (7) a partial amount of water is in the Hand over the regeneration tank (8).

In diesem erfolgt die Zugabe (9) der reduzierenden Mittel zur Aktivierung der Waschflüssigkeit; die Pumpe (10) führt die aktivierte Waschflüssigkeit über einen Einlauf (11) dem Waschflüssigkeitsbehälter (3) zu; mit (12) eine Pumpe; mit (13) der Heißgasbereich.In this, the reducing agents are added (9) for activation the washing liquid; the pump (10) transfers the activated washing liquid an inlet (11) to the washing liquid container (3); with (12) a pump; with (13) the hot gas area.

Selbstverständlich ist die Erfindung nicht auf die vorstehend im einzelnen beschriebenen und dargestellten Ausbildungsformen beschränkt, sondern es sind zahlreiche Abänderungen möglich, ohne jedoch von dem Grundgedanken abzuweichen, die Waschflüssigkeit nach der Berührung mit 502 und NOx über den Ablauf des Waschf Iüssigke it sbehälters (3) einer Feststoffflüssigkeits-Trennstufe (7) zuzuführen, die die abgeschiedene flüssige Waschflüssigkeit, die inaktiv ist, dem Aktivator-Behälter (8) zuführt, in den durch Zugabe von Reduktionsmitteln bei (9) vorzugsweise Ascorbinsäure, Natriumbisulfit, Natriumdithionit und/oder metallisches Eisen in Form von Eisenpulver, Eisenspänen oder ähnlicher Ausbildungsform - und ähnliche Reduktionsstoffe mittels einer Pumpe (10) dann aktiviert wieder dem Waschflüssigkeitsbehälter (3) oder (11) übergeben wird, und/oder bei (5) zusätzlich in eine Düsenebene direkt wieder eingesprüht werden kann, und eine Teilmenge des Filtratwassers, das von (7) nach (8) geführt wird, über eine Pumpe (12) in den Heißgasbereich (13) der Kesselanlage zur thermischen Vernichtung überführt wird bzw. dem Einsatzstoff Kohle aufgesprüht wird.Of course, the invention is not limited to the above in detail training forms described and illustrated are limited, but there are numerous Changes possible, but without to deviate from the basic idea the wash liquid after contact with 502 and NOx via the wash tub drain Supplying the liquid container (3) to a solid-liquid separation stage (7), which the separated liquid washing liquid, which is inactive, the activator container (8) feeds, in which by adding reducing agents in (9) preferably ascorbic acid, Sodium bisulphite, sodium dithionite and / or metallic iron in the form of iron powder, Iron filings or a similar form - and similar reducing substances by means of a pump (10) then reactivates the washing liquid container (3) or (11) is passed, and / or at (5) additionally sprayed directly back into a nozzle level can be, and a portion of the filtrate water that led from (7) to (8) is, via a pump (12) in the hot gas area (13) of the boiler system for thermal Destruction is transferred or the feedstock coal is sprayed on.

Zusatz-Patentansprüche: - Leerseite -Additional claims: - blank page -

Claims (1)

Zusatz-PatentansPrüche: Anspruch 1 Verfahren zur simultanen S02- und NOX -Ausscheidung dadurch gekennzeichnet, daß eine Flüssigkeit, die mit Additiven wie Kalkstein bzw. Kalkhydrat und EDUA bzw. NTA und/oder Polycarbonsäuren und CaSO4 bzw. CaSO3 zur Waschung benutzt wird, als Teilmenge über eine Feststoffflüssigkeits-Trennstufe (7) mit Abgabe der inaktiven Flüssigkeit (8) in einen Reaktionsbehälter (9), in dem reduzierende Additive und/oder metallisches Eisen wie Eisenpulver, Eisenspäne und sonstige Ausbildungsformen von metallischem Eisen zugegeben werden, wobei die reduzierenden Additive in der sauren Phase zugegeben werden, vorzugsweise pH-Wert kleiner 6, - aktiviert wird motte'los einer Pumpe (10) und der Waschwasservorlage (5) über eine Einlaufebene (11) zurückgeführt wird und/oder über Düsenpaare (5) direkt für den WaschprozeB wieder zur Verfügung gestellt wird.Additional claims: Claim 1 method for simultaneous S02 and NOX excretion characterized in that a liquid containing additives such as limestone or hydrated lime and EDUA or NTA and / or polycarboxylic acids and CaSO4 or CaSO3 is used for washing, as a partial amount via a solid-liquid separation stage (7) with delivery of the inactive liquid (8) into a reaction container (9), in the reducing additives and / or metallic iron such as iron powder, iron filings and other forms of metallic iron are added, the reducing additives can be added in the acidic phase, preferably pH less than 6, - a pump (10) and the washing water reservoir are activated without a moth (5) is returned via an inlet level (11) and / or via pairs of nozzles (5) is made available again directly for the washing process. Anspruch 2 Verfahren nach Anspruch 1 dadurch gekennzeichneti daß als Reduktionsmittel vorzugsweise Natriumbisulfit, Ascorbinsäure, Natriumdithionit und metallisches Eisen und ähnliche Reduktionsmittel Anwendung finden.Claim 2 method according to claim 1 characterized in that as Reducing agent preferably sodium bisulfite, Ascorbic acid, sodium dithionite and metallic iron and similar reducing agents are used. Anspruch 3 Verfahren nach Anspruch 1 bis 2 dadurch gekennzeichnet, daß eine Teilmenge des Filtratwassers, bevor es zur Aktivierung geht, mit der Salzfracht in den Feuerungsraum des Kessels zur umweltfreundlichen Vernichtung überführt wird.Claim 3, method according to claim 1 to 2, characterized in that that a portion of the filtrate water, before it goes to activation, with the salt load is transferred to the furnace of the boiler for environmentally friendly destruction. Anspruch 4 Verfahren nach Anspruch 1 bis 3 dadurch gekennzeichnet, daß eine Teilwassermenge des Filtratwassers (12) dem Brennstoff Kohle (13) vor dem Einsatz in den Kessel aufgesprüht wird.Claim 4, method according to claim 1 to 3, characterized in that that a partial amount of water of the filtrate water (12) the fuel coal (13) before Use is sprayed into the boiler.
DE19843430017 1984-01-25 1984-08-16 Simultaneous SO2 and NOx scrubbing with addition of metallic iron outside the oxidation phase Withdrawn DE3430017A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE19843430017 DE3430017A1 (en) 1984-08-16 1984-08-16 Simultaneous SO2 and NOx scrubbing with addition of metallic iron outside the oxidation phase
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
DD85272832A DD233949A5 (en) 1984-03-15 1985-01-29 METHOD FOR THE SEPARATION OF NITROGEN OXIDES AND SULFUR OXIDES AND, WHERE APPROPRIATE, OTHER CONTAMINANTS FROM THE FLUE GASES OF COMBUSTION FACILITIES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843430017 DE3430017A1 (en) 1984-08-16 1984-08-16 Simultaneous SO2 and NOx scrubbing with addition of metallic iron outside the oxidation phase

Publications (1)

Publication Number Publication Date
DE3430017A1 true DE3430017A1 (en) 1986-02-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR880100615A (en) * 1987-09-30 1989-06-22 Basf Ag Method for the regeneration of pupifyling solutions containing chemical complexes fe(ii) and fe(iii)

Citations (3)

* 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
DE2548346A1 (en) * 1974-11-06 1976-05-13 Kureha Chemical Ind Co Ltd Sulphur dioxide removal from combustion gases - by absorption in soln. contg. alkali salt or org. acid and manganous or cupric
DE2519939A1 (en) * 1974-04-01 1976-11-25 Heinz Hoelter Gas purification to remote sulphur dioxide - with calcium cpds in presence of sulphuric and other acids to prevent deposition of calcium carbonate

Patent Citations (3)

* 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
DE2519939A1 (en) * 1974-04-01 1976-11-25 Heinz Hoelter Gas purification to remote sulphur dioxide - with calcium cpds in presence of sulphuric and other acids to prevent deposition of calcium carbonate
DE2548346A1 (en) * 1974-11-06 1976-05-13 Kureha Chemical Ind Co Ltd Sulphur dioxide removal from combustion gases - by absorption in soln. contg. alkali salt or org. acid and manganous or cupric

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR880100615A (en) * 1987-09-30 1989-06-22 Basf Ag Method for the regeneration of pupifyling solutions containing chemical complexes fe(ii) and fe(iii)
US4879102A (en) * 1987-09-30 1989-11-07 Basf Aktiengesellschaft Regeneration of wash solutions containing Fe(II) and Fe(III) chelate complexes

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