EP0210238A1 - Procede de nettoyage de gaz bruts charges d'oxydes de soufre et d'azote - Google Patents

Procede de nettoyage de gaz bruts charges d'oxydes de soufre et d'azote

Info

Publication number
EP0210238A1
EP0210238A1 EP86901055A EP86901055A EP0210238A1 EP 0210238 A1 EP0210238 A1 EP 0210238A1 EP 86901055 A EP86901055 A EP 86901055A EP 86901055 A EP86901055 A EP 86901055A EP 0210238 A1 EP0210238 A1 EP 0210238A1
Authority
EP
European Patent Office
Prior art keywords
washing
redox potential
washing liquid
stage
iron
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.)
Ceased
Application number
EP86901055A
Other languages
German (de)
English (en)
Inventor
Heinrich IGELBÜSCHER
Heinrich Gresch
Heribert Dewert
Heinz HÖLTER
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.)
Holter Heinz Dipl-Ing
Original Assignee
Holter Heinz Dipl-Ing
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 DE3502208A external-priority patent/DE3502208C2/de
Priority claimed from DE19853502207 external-priority patent/DE3502207A1/de
Priority claimed from DE3502732A external-priority patent/DE3502732C2/de
Priority claimed from DE19853503889 external-priority patent/DE3503889A1/de
Application filed by Holter Heinz Dipl-Ing filed Critical Holter Heinz Dipl-Ing
Publication of EP0210238A1 publication Critical patent/EP0210238A1/fr
Ceased 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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—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 process for the purification of raw gases loaded with sulfur and nitrogen oxides, in which the raw gases contain at least one washing step in at least one washing step with an absorbent for the sulfur oxides as well as metal complex compounds, in particular iron-II complex compounds, for the absorption of the nitrogen oxides Is brought into contact.
  • So-called wet processes have become known for cleaning raw gases loaded with sulfur and nitrogen oxides, in which the raw gases have been brought into contact with scrubbing liquids which are enriched with appropriate absorbents for the pollutants.
  • Soluble alkali or alkaline earth compounds are particularly suitable for absorbing the SO.
  • CaSO calcium sulfite
  • Ca (HSO ⁇ ) calcium hydrogen sulfite
  • gypsum stable end product
  • the object of the invention is to develop a method of the type mentioned at the outset which, with constant high efficiency, enables economical separation of sulfur and nitrogen oxides from raw gases.
  • This object is achieved in that the redox potential of the washing liquid is set negatively.
  • complex compounds which contain carboxylic acid groups or their alkali metal or alkaline earth metal salts in the complex-forming anions, in particular those complexes in which aminocarboxylic acids or their salts are present.
  • An essential representative of such chelate complexes is from ethylene - Diaminotetraacetic acid (EDTA) or its alkali or alkaline earth salts.
  • Examples include: ethylene diamine, diethylene triamine, triethylene tetra in, tetraethylene pentamine and higher polyethylene amines; also 1,2-diamines such as propylenediamine, dipropylenetria in etc., and 1,2-, 3,4-tetramines such as butadiene tetramine etc.
  • the value of the negative redox potential is generally below -50 mV, preferably between -100 mV and -300 mV.
  • the setting of the 'negative redox potential takes place by means of an iron cracker, in which under
  • the iron reactor can be connected in the bypass to the washing stage, ie part of the washing liquid is withdrawn from the washing stage, via the iron led reactor and then fed again into the washing stage.
  • the iron reactor then advantageously consists of various bulk beds or it is designed as a steel tube bundle.
  • a further advantageous development of the invention consists in designing the iron reactor as a metal granulate fluidized bed reactor, which is either connected to the washing stage in the bypass, or else the washing liquid in the sump of the washing stage is mixed directly with metallic iron or cast granules which very ' inexpensive to get on the market.
  • the swirling of the metal balls can in this case by means of a rotary piston blower, which is connected to the raw gas, or by means of an O-poor gas ⁇ or by a water-gas mixture.
  • the setting of the negative redox potential can be supported by additionally washing the washing liquid inside the iron reactor.
  • the container wall is to be insulated accordingly or made of plastic, while the respective iron core has the function of the anode.
  • the negative redox potential can also be set in whole or in part by adding suitable reducing agents to the washing liquid, such as sodium dithionite.
  • the part of the washing liquid treated for setting the negative redox potential is contacted again with the raw gas stream before the rest of the washing liquid.
  • the nitrogen released in the course of the treatment of the washing liquid can be drawn off directly from the system together with the clean gas.
  • the upstream scrubber can be designed as a countercurrent scrubber or as a cocurrent scrubber, or both washing stages are integrated in a single two-stage scrubber.
  • This washing liquid is conveyed from a container 7 into the washing stage 11 by means of a pump 6 via two nozzle levels in the present case.
  • the container 7 is designed as an oxidation container in which, with a positive redox potential, the calcium sulfite or calcium hydrogen sulfite washed out in the washing stage 11 is oxidized to calcium sulfate (gypsum).
  • the moist gypsum, including any calcium chloride still present, is drawn off from the system via a line 8 and fed to a treatment unit (not shown here).
  • the crude gas obtained in the head of washing stage 11 and still containing almost all of the NO and residual amounts of SO is fed to a further washing stage 3 via a hood system and is washed there with a further washing liquid which has a negative redox potential.
  • This washing liquid consists of an aqueous solution of, for example, hydrated lime, EDTA-iron-II-chelate and optionally sodium dithionite.
  • the redox potential is preferably between -100 mV and -300 mV.
  • the loaded washing liquid collected via the hood system is fed to a container 4, in which the desired redox potential is set, for example, in the manner described above.
  • the correspondingly prepared washing liquid is fed again into the upper region of washing stage 3 by means of a pump 5 and in the present case two nozzle levels.
  • part of the washing liquid collected in the container 4 is transferred to the oxidation container 7 of the washing stage 11 via a line 9.
  • the calcium sulfite or hydrogen sulfite carried along from washing stage 3 is oxidized to sulfate at a positive redox potential and is likewise drawn off from the system via line 8.
  • a corresponding amount of liquid can be returned from the container 7 to the container 4 at the same time.
  • the cleaned raw gas After passing through a droplet separator system 10, the cleaned raw gas is withdrawn from the system via an outlet 2.
  • the chemicals for the washing liquid of the washing stage 11 are fed into the container 7 and for the washing liquid of the washing stage 11 into the container 4.
  • FIG. 2 shows a two-stage washer in which both the first washing stage 1 operated at a positive redox potential and the second washing stage 3 operated at a negative redox potential are operated in direct current.
  • FIG. 3 finally shows a further embodiment in which the two washing stages 11 and 3 are designed as spatially separate washers, the washer 11 being operated in cocurrent and the scrubber 3 in countercurrent.
  • the droplet separator system 10 is arranged in the gas-carrying connection channel between the two washers.
  • the scrubber system shown in FIG. 3, in which the scrubber 3 can of course also be designed as a countercurrent scrubber or the scrubber 11 as a cocurrent scrubber, is particularly suitable for raw gases with high SO and NO contents, for example behind melting chamber boilers or chemical processes.

Landscapes

  • 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)
  • Gas Separation By Absorption (AREA)

Abstract

Dans un procédé de nettoyage de gaz bruts chargés d'oxydes de soufre et d'azote, les gaz bruts sont mis en contact avec un liquide de lavage contenant un absorbant d'oxydes de soufre, de même qu'en particulier des composés complexes de fer (II) pour absorber les oxydes d'azote, pendant au moins une étape de lavage, le liquide de lavage présentant un potentiel négatif d'oxydoréduction. L'équilibre de l'oxydation des ions de Fe2+ en ions de Fe3+, voir de la réduction des ions de Fe3+ en ions de Fe2+ modifie en favorisant la formation de Fe2+, ce qui permet aux composés complexes de fer d'atteindre une capacité optimale d'absorption.
EP86901055A 1985-01-24 1986-01-24 Procede de nettoyage de gaz bruts charges d'oxydes de soufre et d'azote Ceased EP0210238A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE3502208A DE3502208C2 (de) 1985-01-24 1985-01-24 Verfahren zur simultanen Abscheidung von SO↓2↓ und NO↓x↓ aus Rohgas
DE3502208 1985-01-24
DE19853502207 DE3502207A1 (de) 1984-12-24 1985-01-24 Elektrochemisches verfahren zur reinigung von abgasen in verbindung mit einem eisenreaktor
DE3502207 1985-01-24
DE3502732A DE3502732C2 (de) 1985-01-28 1985-01-28 Verfahren zur Rauchgasreinigung
DE3502732 1985-01-28
DE19853503889 DE3503889A1 (de) 1985-02-06 1985-02-06 Verfahren zur waschung von so(pfeil abwaerts)2(pfeil abwaerts) und no(pfeil abwaerts)x(pfeil abwaerts)
DE3503889 1985-02-06

Publications (1)

Publication Number Publication Date
EP0210238A1 true EP0210238A1 (fr) 1987-02-04

Family

ID=27433282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901055A Ceased EP0210238A1 (fr) 1985-01-24 1986-01-24 Procede de nettoyage de gaz bruts charges d'oxydes de soufre et d'azote

Country Status (2)

Country Link
EP (1) EP0210238A1 (fr)
WO (1) WO1986004260A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1051476C (zh) * 1994-07-11 2000-04-19 三菱重工业株式会社 控制亚硫酸盐氧化的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832937A (en) * 1988-09-28 1989-05-23 The Dow Chemical Company Regeneration of chelated polyvalent metal solutions by controlled potential electrolysis

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126529A (en) * 1977-08-05 1978-11-21 Southern California Edison Company Ferrous ion scrubbing of flue gas
US4331639A (en) * 1981-03-11 1982-05-25 Union Oil Company Of California Process for removing SOx and NOx compounds from gas streams
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8604260A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1051476C (zh) * 1994-07-11 2000-04-19 三菱重工业株式会社 控制亚硫酸盐氧化的方法

Also Published As

Publication number Publication date
WO1986004260A1 (fr) 1986-07-31

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Inventor name: GRESCH, HEINRICH

Inventor name: IGELBUESCHER, HEINRICH

Inventor name: HOELTER, HEINZ

Inventor name: DEWERT, HERIBERT