DE3541323A1 - SO2 scrubbing downstream of combustion plants with crude gypsum as the end product - Google Patents

SO2 scrubbing downstream of combustion plants with crude gypsum as the end product

Info

Publication number
DE3541323A1
DE3541323A1 DE19853541323 DE3541323A DE3541323A1 DE 3541323 A1 DE3541323 A1 DE 3541323A1 DE 19853541323 DE19853541323 DE 19853541323 DE 3541323 A DE3541323 A DE 3541323A DE 3541323 A1 DE3541323 A1 DE 3541323A1
Authority
DE
Germany
Prior art keywords
scrubbing
nox
scrubber
gypsum
prescrubber
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
DE19853541323
Other languages
German (de)
Other versions
DE3541323C2 (en
Inventor
Heinz Dipl Ing Hoelter
Heinrich Dipl Ing Igelbuescher
Heinrich Ing Grad Gresch
Heribert Dipl Ing 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 DE19853541323 priority Critical patent/DE3541323A1/en
Priority to EP86905803A priority patent/EP0241496A1/en
Priority to PCT/EP1986/000572 priority patent/WO1987002269A1/en
Publication of DE3541323A1 publication Critical patent/DE3541323A1/en
Application granted granted Critical
Publication of DE3541323C2 publication Critical patent/DE3541323C2/de
Granted 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
    • B01D53/68—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
    • 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
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • 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
    • 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
    • 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

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

Abstract

It known to scrub out SO2 from the dirty gas stream downstream of fossil-fuelled combustion plants by means of an aqueous solution enriched with lime. The aim is to free from gaseous pollutants the dirty gas loaded with SO2 and/or NOx and other acidic constituents and to achieve gypsum as the end product. Since coal having a very high chlorine content interferes with the actual scrubbing process for scrubbing out SO2 and/or NOx, it is known to provide a so-called prescrubber in order to scrub out the acidic constituents HCl, HF, etc. before the actual SO2 and/or NOx scrubbing. The salt load produced in the prescrubber generally must not be transferred to the rivers or the outfall but must be concentrated by evaporation and supplied to other applications or else to a special landfill. The gypsum produced must frequently be furnished with an additional chloride addition or, depending on the chloride content loading, be fed to a further processing. In order to further improve the purification process overall, according to the invention it is proposed that the crude gas scrubbing is carried out in a prescrubber (2) which is operated at an acidic pH in which chlorides are scrubbed out of the dirty gas stream, and downstream of a scrubber (2) is provided a secondary scrubber (3) in which SO2 and/or NOx are scrubbed, the absorption media for scrubbing SO2 and NOx being fed to the secondary scrubber (3) and the ... Original abstract incomplete. <IMAGE>

Description

Es ist bekannt, SO2 mit einer wässrigen Lösung, die mit Kalk angereichert ist aus dem Rohgasstrom hinter fossilen Verbrennungsanlagen auszuwaschen.It is known to wash SO 2 out of the raw gas stream behind fossil combustion plants with an aqueous solution which is enriched with lime.

Das Endziel ist, das von SO2 und/oder NO x und weiteren sauren Bestandteilen belastete Rohgas von gasförmigen Schadstoffen zu befreien und Gips als Endprodukt zu erzielen.The ultimate goal is to free the raw gas contaminated with SO 2 and / or NO x and other acidic components from gaseous pollutants and to achieve gypsum as the end product.

Es gibt Verbrennungsprodukte, z.B. Kohle mit sehr hohem Chlorgehalt, der den eigentlichen Waschprozeß zur SO2-und NO x -Auswaschung stört, und aufgrund dieser Tatsache wird ein sogenannter "Vorwäscher" der eigent­ lichen SO2- und NO x -Wäsche vorgesetzt, um die sauren Bestandteile HCl, HF usw. vorher auszuwaschen. There are combustion products, for example coal with a very high chlorine content, which interferes with the actual washing process for SO 2 and NO x leaching, and because of this fact a so-called "pre-washer" is placed in front of the actual SO 2 and NO x leaching Wash out the acidic components HCl, HF etc. beforehand.

Diese im Vorwäscher zwangsläufig anfallende Salzfracht darf den Flüssen oder dem Vorfluter in der Regel nicht übergeben werden, sondern muß eingedampft und weiteren Verwendungszwecken oder der Deponie zugeführt werden.This inevitably accumulates salt load in the pre-washer is generally not allowed to enter the rivers or the receiving water passed, but must be evaporated and others Intended for use or the landfill.

Der Gips, der vielfach zu Bergbau-Baustoffen oder auch zu anderen Baustoffen verarbeitet wird, muß vielfach mit einer zusätzlichen Chloridzugabe versehen werden, um die entsprechenden Eigenschaften aufzuweisen.The plaster, which is often used in mining building materials or is processed to other building materials in many cases with an additional chloride addition, to have the appropriate properties.

Vielfach muß der Gips auch einer Zwischenlagerung zugeführt werden, um dann entsprechend der Belastung an Chloridgehalten einer weiteren Verarbeitung zuge­ führt zu werden.In many cases, the plaster must also be stored temporarily are then fed according to the load of chloride content for further processing to be led.

Um den Gips gleichzeitig mit der Salzfracht zu ver­ setzen, ohne den SO2- und NO x -Waschprozeß zu stören, der oberhalb von 10% Calciumchlorid in der Wasch­ lösung, insbesondere beim Kalksteinwaschverfahren, nicht mehr mit einer max. Auswaschung von SO2 und NO x arbeitet, und um den Gips nicht zusätzlich in der SO2- und NO x -Waschstufe oxidieren zu müssen bei einem pH-Wert um oberhalb von pH 5, wo die Oxidation nicht vollständig verläuft, wird erfindungsgemäß vorge­ schlagen, ein Verfahren entsprechend nachstehender Beschreibung und Zeichnung zu wählen.In order to set the gypsum at the same time as the salt load, without disturbing the SO 2 and NO x washing process, the above 10% calcium chloride in the washing solution, in particular in the limestone washing process, no longer with a max. Washing out of SO 2 and NO x works, and in order not to additionally oxidize the gypsum in the SO 2 and NO x washing stage at a pH value above pH 5, where the oxidation does not proceed completely, is proposed according to the invention to choose a method according to the description and drawing below.

Mit (1) ist das Rohgas dargestellt, mit (2) der Vorwäscher, in dem mit einem sauren pH-Wert vorzugsweise unterhalb pH 5 das Rohgas gewaschen wird, mit (3) der SO2 und/oder SO2- und NO x -Wäscher, in dem vorzugsweise oberhalb von pH 5 gefahren wird, mit (4) der Reingaskamin, mit (5) das aus dem SO2- und NO x -Wäscher entfernte Gemisch, das aus der Kalksuspen­ sion stammt, das im Wäscher (3) verwendet wurde, bestehend aus nicht gänzlich oxidiertem Produkt CaSO3/CaSO4. Dieses wird erfindungsgemäß über eine Leitung (6) in den Vorwäscher (2) gepumpt, und hier entsteht aufgrund des hohen Luftsauerstoffüberschusses im Rohgas in der sauren Phase in der Waschflüssigkeit ein gutes oxidiertes CaSO4-Produkt (7) mit ent­ sprechendem Calciumchloridgehalt. With ( 1 ) the raw gas is shown, with ( 2 ) the pre-scrubber, in which the raw gas is washed with an acidic pH value, preferably below pH 5, with ( 3 ) the SO 2 and / or SO 2 - and NO x - Washer, in which operation is preferably carried out above pH 5, with ( 4 ) the clean gas chimney, with ( 5 ) the mixture removed from the SO 2 and NO x washer, which originates from the lime suspension, which is present in the washer ( 3 ) was used, consisting of not fully oxidized product CaSO 3 / CaSO 4 . According to the invention, this is pumped via a line ( 6 ) into the pre-washer ( 2 ), and here a good oxidized CaSO 4 product ( 7 ) with a corresponding calcium chloride content is formed in the wash phase due to the high excess of oxygen in the raw gas in the acid phase.

Durch diese erfindungsgemäße Fahrweise wird die optimale Auswaschung von SO2 und NO x im Wäscher (3) ermöglicht und eine optimale Oxidation mit An­ reicherung von Chloriden im Rohgips, der zur weiteren Verwendung gut über den Sauerstoffüber­ schuß des sauren pH-Werts im Wäscher (2) oxidiert hergestellt wurde.This method of operation according to the invention enables optimal washing out of SO 2 and NO x in the scrubber ( 3 ) and optimal oxidation with enrichment of chlorides in the raw gypsum, which is good for further use via the excess of oxygen of the acidic pH in the scrubber ( 2 ) was produced oxidized.

Claims (1)

Verfahren zur Waschung von SO2, HCl, HF und NO x hinter Verbrennungsanlagen mit Endprodukt Rohgips dadurch gekennzeichnet, daß die Rohgaswäsche in einem Vorwäscher erfolgt, der mit saurem pH-Wert betrieben wird, in dem Chloride aus dem Rohgasstrom gewaschen werden und einem dem Wäscher (2) nachge­ schalteten Nachwäscher (3), in dem SO2 und/oder NO x gewaschen wird, wobei die Absorbtionsmittel zur Waschung von SO2 und NO x dem Wäscher (3) zuge­ führt werden und das aus dem Wäscher (3) anfallende Produkt, bestehend aus nicht gänzlich oxidiertem CaSO3/CaSO4 dem Vorwäscher (2) zugepumpt wird, und hier mittels Sauerstoffüberschuß im Rohgas eine gute Oxidation und gute Mischung der Chloride mit dem erstellten Rohgips erzeugt wird.Process for washing SO 2 , HCl, HF and NO x behind incinerators with end product raw gypsum, characterized in that the raw gas scrubbing takes place in a pre-scrubber, which is operated at an acidic pH, in which chlorides are washed from the raw gas stream and one to the scrubber ( 2 ) downstream scrubber ( 3 ), in which SO 2 and / or NO x is washed, the absorbent for washing SO 2 and NO x being fed to the scrubber ( 3 ) and that from the scrubber ( 3 ) Product consisting of not completely oxidized CaSO 3 / CaSO 4 is pumped into the pre-scrubber ( 2 ), and a good oxidation and good mixing of the chlorides with the raw gypsum produced is produced here by means of an excess of oxygen in the raw gas.
DE19853541323 1985-10-11 1985-11-22 SO2 scrubbing downstream of combustion plants with crude gypsum as the end product Granted DE3541323A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19853541323 DE3541323A1 (en) 1985-11-22 1985-11-22 SO2 scrubbing downstream of combustion plants with crude gypsum as the end product
EP86905803A EP0241496A1 (en) 1985-10-11 1986-10-08 Process for simultaneous extraction of so 2? and no x? contained in waste gases
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
DE19853541323 DE3541323A1 (en) 1985-11-22 1985-11-22 SO2 scrubbing downstream of combustion plants with crude gypsum as the end product

Publications (2)

Publication Number Publication Date
DE3541323A1 true DE3541323A1 (en) 1987-05-27
DE3541323C2 DE3541323C2 (en) 1988-04-28

Family

ID=6286572

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853541323 Granted DE3541323A1 (en) 1985-10-11 1985-11-22 SO2 scrubbing downstream of combustion plants with crude gypsum as the end product

Country Status (1)

Country Link
DE (1) DE3541323A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001820A1 (en) * 1987-08-22 1989-03-09 HÖLTER, Heinz Process for desulphurating flue gases from power station boiler furnaces

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2451274A1 (en) * 1973-10-31 1975-05-15 Kureha Chemical Ind Co Ltd PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM GASES CONTAINING NITROGEN

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2451274A1 (en) * 1973-10-31 1975-05-15 Kureha Chemical Ind Co Ltd PROCESS FOR THE REMOVAL OF NITROGEN OXIDES FROM GASES CONTAINING NITROGEN

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-Z: Umwelt, H.4, 1985, S.26-28 *
DE-Z: VGB Kraftwerkstechnik, 63, H.4, April 1983, S.335 bis 344 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001820A1 (en) * 1987-08-22 1989-03-09 HÖLTER, Heinz Process for desulphurating flue gases from power station boiler furnaces

Also Published As

Publication number Publication date
DE3541323C2 (en) 1988-04-28

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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