DE3536312C2 - - Google Patents

Info

Publication number
DE3536312C2
DE3536312C2 DE3536312A DE3536312A DE3536312C2 DE 3536312 C2 DE3536312 C2 DE 3536312C2 DE 3536312 A DE3536312 A DE 3536312A DE 3536312 A DE3536312 A DE 3536312A DE 3536312 C2 DE3536312 C2 DE 3536312C2
Authority
DE
Germany
Prior art keywords
caso
washing
simultaneous
scrubber
stage
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.)
Expired
Application number
DE3536312A
Other languages
German (de)
Other versions
DE3536312A1 (en
Inventor
Heinz Dipl.-Ing. Hoelter
Heinrich Dipl.-Ing. 4390 Gladbeck De Igelbuescher
Heinrich Ing.(Grad.) 4600 Dortmund De Gresch
Heribert Dipl.-Ing. 4390 Gladbeck De 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
Application filed by Individual filed Critical Individual
Priority to DE19853536312 priority Critical patent/DE3536312A1/en
Priority to EP86905803A priority patent/EP0241496A1/en
Priority to JP61505392A priority patent/JPS63501060A/en
Priority to PCT/EP1986/000572 priority patent/WO1987002269A1/en
Publication of DE3536312A1 publication Critical patent/DE3536312A1/en
Application granted granted Critical
Publication of DE3536312C2 publication Critical patent/DE3536312C2/de
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C01F11/464—Sulfates of Ca from gases containing sulfur 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
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)

Description

Die Erfindung betrifft ein Verfahren zur simultanen Waschung von SO2 und NO x enthaltenden Rauchgasen aus Schmelzkammerkesseln, wobei das Rauchgas zwei Wasch­ stufen durchläuft.The invention relates to a process for the simultaneous washing of SO 2 and NO x containing flue gases from melting chamber boilers, the flue gas passing through two washing stages.

Ein Verfahren vorgenannter Art ist bekannt durch die DE-OS 24 51 274, insbesondere Beispiel 6.A method of the aforementioned type is known from the DE-OS 24 51 274, in particular example 6.

Es ist bekannt, daß bei simultaner Waschung von SO2 und NO x aus Rauchgasen besonders hinter Kraftwer­ ken ein bestimmtes Mengenverhältnis zwischen SO2 und NO x (z. B. 2,0-2,4 g SO2 : 1 g NO x pro Nm 3 Rauchgas) vorhanden sein muß. Insbesondere bei Schmelzkammerkes­ seln liegt das vorerwähnte Verhältnis zwischen der SO2- und NO x -Belastung im Rauchgas für die Durchführung des Naßverfahrens nicht vor. In den meisten Fällen liegt das SO2 im Rauchgas gegenüber NO x unterstöchiometrisch vor, wobei die SO2-Fehlmenge durch Zugabe von Flüssigschwefel­ dioxid, Natriumpyrosulfit oder durch eine Gipsspaltanla­ ge ersetzt werden kann. Diese SO2-Zugaben sind aber ver­ gleichsweise aufwendig. It is known that with simultaneous washing of SO 2 and NO x from flue gases, especially after power plants, a certain quantitative ratio between SO 2 and NO x (e.g. 2.0-2.4 g SO 2 : 1 g NO x per Nm 3 flue gas) must be available. In particular in the case of smelting chambers, the aforementioned ratio between the SO 2 and NO x pollution in the flue gas for carrying out the wet process is not available. In most cases, the SO 2 in the flue gas is sub-stoichiometric with respect to NO x , and the SO 2 deficiency can be replaced by adding liquid sulfur dioxide, sodium pyrosulfite or by a gypsum splitter. These SO 2 additions are comparatively expensive.

Von diesem Stand der Technik ausgehend liegt der Erfin­ dung die Aufgabe zugrunde, bei einem Verfahren der ein­ gangs genannten Art das für die Simultan-Wäsche erfoder­ liche Verhältnis von SO2 zu NO x einzustellen und das Verfahren unter Einsparung eines Oxideurs ablaufen zu lassen.On the basis of this prior art, the invention is based on the object of adjusting the ratio of SO 2 to NO x required for simultaneous washing in a method of the type mentioned at the outset and of letting the method run with the saving of an oxidizer.

Zur Lösung dieser Aufgabe werden die im Kennzeichen des Hauptanspruches aufgeführten Merkmale vorgeschlagen. Die zur vorteilhaften Ausgestaltung der Erfindung vorge­ schlagenen Mittel sind Gegenstand des Unteranspruchs 2.To solve this task, those in the characteristics of Main claim listed features proposed. The featured on the advantageous embodiment of the invention Proposed funds are the subject of dependent claim 2.

Die Erfindung ist an Hand der Zeichnung näher erläutert.The invention is explained in more detail with reference to the drawing.

Mit 1 ist der Vorwäscher bezeichnet, welcher sauer be­ trieben wird, vorzugsweise mit einem pH-Wert zwischen 1-2, und zur Waschung von HCl und HF dient. In dem Simultan-Wäscher 2 findet die Auswaschung von SO2 und NO x statt. Dem Simultan-Wäscher 2 ist die Wertstoffrückge­ winnung 3 mit einer Gipsfällstufe nachgeschaltet. Das ausgefällte Gemisch, bestehend aus CaSO3, CaSO4 und Spuren von reinem CaO, wird über die Leitung 4 der Vorwaschstufe 1 zugeführt. 1 with the prewashers is referred to, which is operated acidic, preferably with a pH between 1-2, and is used for washing HCl and HF. In the simultaneous washer 2 , SO 2 and NO x are washed out. The simultaneous scrubber 2 is followed by the recycling 3 with a gypsum precipitation stage. The precipitated mixture, consisting of CaSO 3 , CaSO 4 and traces of pure CaO, is fed via line 4 to the prewash stage 1 .

Durch den sauren pH-Wert wird im Vorwäscher 1 und im nach­ gesetzten Sumpf das Gemisch aus CaSO4 und CaSO3 durch den im Rauchgas zusätzlich enthaltenden überschüssigen Sauerstoff zu CaSO4 × 2 H2O oxidiert. Auf diese Weise wird somit ein Oxi­ deur eingespart.As a result of the acidic pH value, the mixture of CaSO 4 and CaSO 3 is oxidized in the pre-scrubber 1 and in the bottom sump by the excess oxygen additionally contained in the flue gas to CaSO 4 × 2 H 2 O. In this way, an Oxi deur is saved.

Weiterhin kann die fehlende SO2-Menge, die für die Reak­ tion der SO2/NO x -Simultan-Waschung erforderlilch ist, in dem Vorwäscher 1 für HCl/HF durch Absenkung des pH- Wertes soweit sauer abgestuft und die Verweilzeit des Gemisches von CaSO3/CaSO4 im Wäschesumpf so erhöht wer­ den, daß durch Zersetzung von CaSO3 genügend SO2 frei­ gesetzt wird, um die Reaktion im Simultan-Wäscher 2 ge­ sichert ablaufen zu lassen.May further include the lack of SO 2 amount, which is for the reac of SO 2 / NO x tion -Simultan wash erforderlilch, in the prescrubber 1 for HCl / HF by lowering the pH so far as acid-graded and the residence time of the mixture of CaSO 3 / CaSO 4 in the laundry sump is increased so that the decomposition of CaSO 3 releases enough SO 2 to allow the reaction in the simultaneous scrubber 2 to run safely.

Claims (2)

1. Verfahren zur simultanen Waschung von SO2 und NO x enthaltenden Rauchgasen aus Schmelzkammerkesseln, wo­ bei das Rauchgas zwei Waschstufen durchläut, dadurch gekennzeichnet, daß der aus dem Simultan-Wäscher (2) oder aus der Wertstoffrückgewinnungsstufe (3) bzw. aus der Waschflüssigkeitsaufbereitungsstufe (3) aus­ gefällte Feststoff, bestehend aus CaSO3/CaSO4, dem Waschflüssigkeitsstrom der Vorwaschstufe (1) zur Oxi­ dation der CaSO3-Menge mittels Sauerstoff des Rauch­ gases bei einem pH-Wert der Waschlösung von pH 1- 2,5 zugeführt wird.1. A process for the simultaneous washing of SO 2 and NO x- containing flue gases from melting chamber boilers, where two flue gases pass through the flue gas, characterized in that from the simultaneous washer ( 2 ) or from the material recovery stage ( 3 ) or from the scrubbing liquid preparation stage ( 3 ) from precipitated solid, consisting of CaSO 3 / CaSO 4 , the washing liquid stream of the prewash stage ( 1 ) for the oxidation of the amount of CaSO 3 by means of oxygen of the flue gas at a pH value of the washing solution of pH 1-2.5 becomes. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der ausgefällte Feststoff dem Wäscher bzw. Wä­ schersumpf der Vorwaschstufe (1) zugeführt wird und solange bei einem pH-Wert von 1-1,5 kontaktiert wird, bis die entsprechende, zur Simultan-Waschung von SO2 und NO x im Wäscher (2) benötigte Menge SO2 freigesetzt wird.2. The method according to claim 1, characterized in that the precipitated solid is fed to the scrubber or scrubber sump of the prewash stage ( 1 ) and is contacted at a pH of 1-1.5 until the corresponding, simultaneous Washing of SO 2 and NO x in the scrubber ( 2 ) required amount of SO 2 is released.
DE19853536312 1985-10-11 1985-10-11 Simultaneous separation-off of SO2/NOx in the aqueous phase with production of gypsum and SO2 release in the preliminary scrubbing stage Granted DE3536312A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19853536312 DE3536312A1 (en) 1985-10-11 1985-10-11 Simultaneous separation-off of SO2/NOx in the aqueous phase with production of gypsum and SO2 release in the preliminary scrubbing stage
EP86905803A EP0241496A1 (en) 1985-10-11 1986-10-08 Process for simultaneous extraction of so 2? and no x? contained in waste gases
JP61505392A JPS63501060A (en) 1985-10-11 1986-10-08 Method for simultaneously separating SO↓2- and NOx from flue gas
PCT/EP1986/000572 WO1987002269A1 (en) 1985-10-11 1986-10-08 Process for simultaneous extraction of so2 and nox contained in waste gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853536312 DE3536312A1 (en) 1985-10-11 1985-10-11 Simultaneous separation-off of SO2/NOx in the aqueous phase with production of gypsum and SO2 release in the preliminary scrubbing stage

Publications (2)

Publication Number Publication Date
DE3536312A1 DE3536312A1 (en) 1987-04-16
DE3536312C2 true DE3536312C2 (en) 1988-04-28

Family

ID=6283363

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853536312 Granted DE3536312A1 (en) 1985-10-11 1985-10-11 Simultaneous separation-off of SO2/NOx in the aqueous phase with production of gypsum and SO2 release in the preliminary scrubbing stage

Country Status (2)

Country Link
JP (1) JPS63501060A (en)
DE (1) DE3536312A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2090142A (en) * 1933-12-28 1937-08-17 Ici Ltd Wet purification of gases
GB1482643A (en) * 1973-10-31 1977-08-10 Kureha Chemical Ind Co Ltd Method for removing oxides of nitrogen from a gas

Also Published As

Publication number Publication date
JPS63501060A (en) 1988-04-21
DE3536312A1 (en) 1987-04-16

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8363 Opposition against the patent
8330 Complete disclaimer