WO1987005825A1 - PROCEDE POUR TRAITER LE LIQUIDE DE LAVAGE LORS DE L'ELIMINATION DE SO2 ET NOx CONTENUS DANS DES GAZ DE FUMEE - Google Patents

PROCEDE POUR TRAITER LE LIQUIDE DE LAVAGE LORS DE L'ELIMINATION DE SO2 ET NOx CONTENUS DANS DES GAZ DE FUMEE Download PDF

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Publication number
WO1987005825A1
WO1987005825A1 PCT/EP1987/000187 EP8700187W WO8705825A1 WO 1987005825 A1 WO1987005825 A1 WO 1987005825A1 EP 8700187 W EP8700187 W EP 8700187W WO 8705825 A1 WO8705825 A1 WO 8705825A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron
washing liquid
nox
flue gases
washing
Prior art date
Application number
PCT/EP1987/000187
Other languages
German (de)
English (en)
Inventor
Heinz HÖLTER
Heinrich IGELBÜSCHER
Heinrich Gresch
Heribert Dewert
Original Assignee
Hoelter Heinz
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 DE19863611475 external-priority patent/DE3611475A1/de
Priority claimed from DE19863614944 external-priority patent/DE3614944A1/de
Priority claimed from DE19863617836 external-priority patent/DE3617836A1/de
Priority claimed from DE19863619495 external-priority patent/DE3619495A1/de
Priority claimed from DE19863620061 external-priority patent/DE3620061A1/de
Application filed by Hoelter Heinz filed Critical Hoelter Heinz
Publication of WO1987005825A1 publication Critical patent/WO1987005825A1/fr

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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

Definitions

  • the invention relates to a method for treating the washing liquid during the removal of SO2 and NOx from flue gases, the raw gas being contacted with an washing liquid containing alkaline iron-II-EDTA complexes and a reducing agent. It is known to reduce SO2 and NOx in flue gases by means of washing solutions in washing machines. Here EDTA iron complex compounds are used in preferably alkaline washing solutions. A strong iron oxidation from iron-II to iron-III is inevitably generated by the high atmospheric oxygen in the flue gas.
  • the washing liquid is a Dwell time container supplied and stored in this for reduction with a dwell time greater than 15 min.
  • the residence time is set depending on the amount of iron III to be reduced.
  • the reduction in the retention tank is due to the sulfite contained in the washing liquid.
  • the nitrosyl complex (EDTA Fe-II - NO) is reduced to sulfate and elemental nitrogen.
  • the reduction of the FE-III-EDTA complex can thus be achieved by incorporating a retention tank alone or by setting the optimum temperature alone or by combining the aforementioned variants.
  • the residence time of the entire washing liquid or a partial stream in a container assigned to the process, such as washing sump, thickener, reserve or additional container, should be between 15 minutes and 3 hours.
  • the temperature range usually results from the total course of the flue gas temperatures, which results in washing liquid temperatures of 40 degrees C to 48 degrees C. This already provides favorable conditions for the Fe III EDTA reduction.
  • a further reduction is achieved, however, if the washing liquid or a partial flow is brought to higher temperatures up to 70 degrees C in a circuit or in a separate arrangement.
  • the degree of NOx separation can also be influenced by choosing a preferred range for the density of the washing solution. It has been shown that densities of the washing solution in the range from 1.10 to 1.20 g / l are advantageous in order to achieve high levels of NOx removal.
  • This process does not require any additional energy, but rather brings about an improvement in the efficiency in the cooling tower and thus an improvement in the use of energy in the power plant.
  • the basic idea of this embodiment is therefore to extract heat from the power plant process, preferably from the area of the unused and inevitably removed leading heat, and to use this via a heat exchanger system, which is arranged according to the invention in the retention tank for heating the washing water in order to promote the reduction of iron-III to iron-II, this heat extraction from the area of the cooling tower and / or flue gas after the electrostatic precipitator in the range of 100 - 180 degrees C and / or from the area behind the rotary gavo or rotary luvo with less than 100 degrees C and used in the dwell.
  • magnesium salt - preferably magnesium chloride or magnesium sulfate - greatly attenuated the iron oxidation. Furthermore, the solubility of sodium sulfate formed is greatly reduced by the addition of magnesium chloride or magnesium suifate, so that calcium sulfate is preferably formed when precipitated with hydrated lime.
  • the magnesium increases the solubility of sulfite in the wash water, so that the sulfite required for iron reduction is less precipitated.
  • the magnesium chloride or magnesium sulfate can be added to any type of washing solution which is based on lime and / or sodium with an iron chelate complex.

Abstract

Dans le procédé décrit, le gaz non-traité est mis en contact avec un liquide de lavage contenant des complexes alcalins fer-II-EDTA et un agent de réduction. Il est connu de réduire le SO2 et le NOx dans les gaz de fumée à l'aide de solutions de lavage dans une unité de lavage. A cet effet, des composés de complexes EDTA-fer sont utilisés dans des solutions de lavage de préférence alcalines, et une forte oxydation ferrique du fer-II en fer-III se produit inévitablement en raison du niveau élevé de l'oxygène atmosphérique dans les gaz de fumée. Pour permettre la réduction du fer-III en fer-II, on utilise des agents de réduction ou des procédés électrolytiques. La consommation nécessaire de l'agent de réduction ou le recours à l'électrolyse sont très onéreux. Afin de réduire de manière significative cette consommation, il est proposé de faire séjourner le liquide de lavage dans un réservoir pendant une durée supérieure à 15 minutes aux fins de réduction. Le temps de séjour est choisi en fonction de la quantié de fer-III à réduire. D'autre part, on peut également influencer sur le degré de séparation de NOx en sélectionnant la masse volumique du liquide de lavage dans la plage comprise entre 1,10 et 1,20 gr/l. Cette invention permet également d'ajouter celle de magnésium à la solution de complexe de chélate ferreux dans le liquide de lavage.
PCT/EP1987/000187 1986-04-05 1987-04-04 PROCEDE POUR TRAITER LE LIQUIDE DE LAVAGE LORS DE L'ELIMINATION DE SO2 ET NOx CONTENUS DANS DES GAZ DE FUMEE WO1987005825A1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
DEP3611475.8 1986-04-05
DE19863611475 DE3611475A1 (de) 1986-04-05 1986-04-05 Simultane so(pfeil abwaerts)2(pfeil abwaerts)- und no(pfeil abwaerts)x(pfeil abwaerts)-abscheidung in rauchgasen hinter verbrennungsanlagen
DEP3614944.6 1986-05-02
DE19863614944 DE3614944A1 (de) 1986-05-02 1986-05-02 Simultanes waschverfahren zur entschwefelung und gleichzeitigen entstickung von rauchgasen hinter muellverbrennungsanlagen
DE19863617836 DE3617836A1 (de) 1986-05-27 1986-05-27 Waschloesung zur abscheidung von no(pfeil abwaerts)x(pfeil abwaerts)
DEP3617836.5 1986-05-27
DEP3619495.6 1986-06-10
DE19863619495 DE3619495A1 (de) 1986-04-05 1986-06-10 Verfahren zur behandlung von waschfluessigkeit bei der so(pfeil abwaerts)2(pfeil abwaerts)/no(pfeil abwaerts)x(pfeil abwaerts)-simultanreinigung von rauchgasen
DE19863620061 DE3620061A1 (de) 1986-06-14 1986-06-14 Verfahren zur simultanen so(pfeil abwaerts)2(pfeil abwaerts)- u. no(pfeil abwaerts)x(pfeil abwaerts)-abscheidung
DEP3620061.1 1986-06-14

Publications (1)

Publication Number Publication Date
WO1987005825A1 true WO1987005825A1 (fr) 1987-10-08

Family

ID=27510958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000187 WO1987005825A1 (fr) 1986-04-05 1987-04-04 PROCEDE POUR TRAITER LE LIQUIDE DE LAVAGE LORS DE L'ELIMINATION DE SO2 ET NOx CONTENUS DANS DES GAZ DE FUMEE

Country Status (3)

Country Link
EP (1) EP0262204A1 (fr)
JP (1) JPS63502971A (fr)
WO (1) WO1987005825A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108854461A (zh) * 2018-05-24 2018-11-23 浙江工业大学 Mn作为还原剂协同FeII(EDTA)资源处理NO的应用

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445567A1 (de) * 1973-09-24 1975-04-03 Asahi Chemical Ind Verfahren zum entfernen von stickstoffmonoxid aus einem stickstoffmonoxid enthaltenden gas
WO1985003238A2 (fr) * 1984-01-25 1985-08-01 Hoelter Heinz Procede d'extraction des oxydes d'azote et des oxydes de soufre, ainsi que, le cas echeant, d'autres elements nocifs des gaz de fumees provenant d'installations de combustion
DE3507626A1 (de) * 1985-03-05 1986-09-11 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Verfahren und vorrichtung zur durchfuehrung des verfahrens von no(pfeil abwaerts)x(pfeil abwaerts)-abscheidungen hinter bereits installierten rauchgaswaeschern zur so(pfeil abwaerts)2(pfeil abwaerts)-abscheidung oder rauchgasen, die nur no(pfeil abwaerts)x(pfeil abwaerts)-belastungen aufweisen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445567A1 (de) * 1973-09-24 1975-04-03 Asahi Chemical Ind Verfahren zum entfernen von stickstoffmonoxid aus einem stickstoffmonoxid enthaltenden gas
WO1985003238A2 (fr) * 1984-01-25 1985-08-01 Hoelter Heinz Procede d'extraction des oxydes d'azote et des oxydes de soufre, ainsi que, le cas echeant, d'autres elements nocifs des gaz de fumees provenant d'installations de combustion
DE3507626A1 (de) * 1985-03-05 1986-09-11 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Verfahren und vorrichtung zur durchfuehrung des verfahrens von no(pfeil abwaerts)x(pfeil abwaerts)-abscheidungen hinter bereits installierten rauchgaswaeschern zur so(pfeil abwaerts)2(pfeil abwaerts)-abscheidung oder rauchgasen, die nur no(pfeil abwaerts)x(pfeil abwaerts)-belastungen aufweisen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108854461A (zh) * 2018-05-24 2018-11-23 浙江工业大学 Mn作为还原剂协同FeII(EDTA)资源处理NO的应用

Also Published As

Publication number Publication date
JPS63502971A (ja) 1988-11-02
EP0262204A1 (fr) 1988-04-06

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