DE3701339A1 - Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers - Google Patents

Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers

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Publication number
DE3701339A1
DE3701339A1 DE19873701339 DE3701339A DE3701339A1 DE 3701339 A1 DE3701339 A1 DE 3701339A1 DE 19873701339 DE19873701339 DE 19873701339 DE 3701339 A DE3701339 A DE 3701339A DE 3701339 A1 DE3701339 A1 DE 3701339A1
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DE
Germany
Prior art keywords
flue gas
fossil
gas purification
peak loads
removing nox
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Withdrawn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
DE19873701339
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Heinrich Dipl Ing Igelbuescher
Heinrich Ing Grad Gresch
Heribert Dipl Ing Dewert
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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 DE19873701339 priority Critical patent/DE3701339A1/en
Publication of DE3701339A1 publication Critical patent/DE3701339A1/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Withdrawn legal-status Critical Current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
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides

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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

The additional removal of NOx from flue gases of combustion systems is ensured by the use of a circulated scrubbing fluid which is provided with media decreasing both SO2 and NOx. The occasionally necessary addition of reducing agent is preferably carried out to the scrubbing water of the nozzle plane which is closest to the clean gas. The economic efficiency is improved by decreasing O2 in the exhaust gas by additional flue gas recycling.

Description

Es ist bekannt, daß hinter Verbrennungsanlagen außer SO2, HCl und anderen sauren Schadstoffen auch NO x vielfach über die Grenzwerte von 200 mg/Nm3 belastend erzeugt wird.It is known that behind incinerators, in addition to SO 2 , HCl and other acidic pollutants, NO x is also produced in many cases above the limit values of 200 mg / Nm 3 .

Bei geringfügiger Überschreitung des NO x -Grenzwertes von 10- oder 20% ist der Einsatz von Katalysatoren oder anderen Verfahren zur NO x -Reduzierung z. B. auch durch eine Simultanwäsche von SO2 und NO x - so wie bisher bekannt - nicht wirtschaftlich vertretbar.If the NO x limit value of 10 or 20% is slightly exceeded, the use of catalysts or other methods for NO x reduction z. B. also by a simultaneous washing of SO 2 and NO x - as previously known - not economically viable.

Um diesen Nachteil der auch volkswirtschaftlich nicht vertretbaren Verteuerung durch Zentralanlagen zur NO x - Minderung, die teilweise die kWh-Stunde bis weit über 10% der Erzeugungskosten belasten, zu vermeiden, wird erfin­ dungsgemäß vorgeschlagen, ein Verfahren entsprechend nachstehender Beschreibung zu nutzen:In order to avoid this disadvantage of the economically unacceptable increase in cost due to central systems for NO x reduction, which in part burden the kWh hour to well over 10% of the production costs, it is proposed according to the invention to use a method as described below:

Es ist vorzugsweise ein Verfahren in zweistufiger Wirksamkeit zu verwenden.It is preferably a two stage process Effectiveness to use.

In der ersten Stufe wird erfindungsgemäß vorgeschlagen, durch Primärmaßnahmen den Sauerstoffwert im Rohgas herab­ zusetzen von z. B. 6 Vol.-% auf kleiner 4 Vol.-%.In the first stage, the invention proposes the oxygen value in the raw gas is reduced by primary measures add z. B. 6 vol .-% to less than 4 vol .-%.

Das kann dadurch erzielt werden, daß durch Rückführung von Rauchgasen in den Feuerungsraum aus dem abklingenden Roh­ gasbereich eine Reduzierung erzielt wird, wobei gleich­ zeitig zu der bekannten Waschung mit Kalkstein, Kalkhydrat bzw. Natronlauge o. ä. Waschflüssigkeiten eine an sich be­ kannte EDTA- oder NTA-Menge der Waschflüssigkeit zuge­ führt wird und zwar erfindungsgemäß dem Waschwasser, das der letzten Düsenebene, die dem Rohgasstrom in einem Gegenstromwäscher beispielsweise entgegensteht, zuge­ führt wird und außerdem zusätzlich ein Reduktionsmittel zugeimpft wird, das die Reduktion der Fe3-Ionen zu Fe2-Ionen reduziert, um die NO x -Menge aus dem Rauchgas entfernen zu können.This can be achieved in that a reduction is achieved by returning flue gases into the combustion chamber from the decaying raw gas area, while at the same time as the known washing with limestone, hydrated lime or sodium hydroxide or the like, washing liquids are a known EDTA. or NTA amount of the washing liquid is supplied, in accordance with the invention the washing water, which leads to the last nozzle level, which, for example, opposes the raw gas flow in a countercurrent scrubber, and also inoculates a reducing agent which reduces the reduction of Fe 3 ions to Fe 2 ions reduced in order to be able to remove the amount of NO x from the flue gas.

Hierbei ist erfindungsgemäß ein geringer Sauerstoff­ gehalt im Rohgas von Vorteil, und es wurde gefunden, daß dieser Vorteil den Prozeß durch verminderten Reduk­ tionsmittelverbrauch preiswert gestaltet.Here, according to the invention, there is little oxygen content in the raw gas is beneficial and it was found that this advantage the process by reduced Reduk agent consumption inexpensively designed.

In der Zeichnung ist das erfindungsgemäße Verfahren im Bereich des Wäschers dargestellt:
mit (1) der Gegenstromwäscher;
mit (2) das Rohgas;
mit (3) das Reingas;
mit (4) die letzte Düsenebene, die mit Reduktionsmitteln zur Waschflüssigkeit versehen wird;
mit (5) der Wäschersumpf;
mit (6) das Reduktionsmittel. The drawing shows the method according to the invention in the area of the washer:
with ( 1 ) the counterflow washer;
with ( 2 ) the raw gas;
with ( 3 ) the clean gas;
with ( 4 ) the last nozzle level, which is provided with reducing agents for the washing liquid;
with ( 5 ) the laundry sump;
with ( 6 ) the reducing agent.

Bei einem Gleichstromwäscher ist es ebenfalls die letzte Düsenebene, die mit dem abgehenden Gas, d. h. auf der Reingasseite, angebracht ist - also in dem Bereich, wo erfindungsgemäß die geringste Sauerstoff­ belastung vorliegt.It is also the case with a DC washer last nozzle level, which with the outgoing gas, d. H. on the clean gas side, is attached - so in that Area where according to the invention the lowest oxygen load is present.

Claims (2)

1. Verfahren zur Beseitigung von NO x -Belastungen im Rohgas hinter Verbrennungsanlagen, dadurch gekennzeichnet, daß der im Kreislauf geführten Waschflüssigkeit, die mit SO2 - und NO x - reduzierenden Mitteln versehen ist, wie Kalkstein, Kalkhydrat und Natronlauge und NTA oder EDTA, im Wasseraufgabebereich der letzten Düsenebene, die im Rohgasstrom, also der Reingasphase am nächsten liegt, ein Reduktionsmittel zur Reduktion von Eisen III zu Eisen II zugeimpft wird.1. A process for eliminating NO x pollution in the raw gas behind incinerators, characterized in that the circulating scrubbing liquid, which is provided with SO 2 - and NO x - reducing agents, such as limestone, hydrated lime and sodium hydroxide solution and NTA or EDTA, A reducing agent for reducing iron III to iron II is inoculated in the water feed area of the last nozzle level, which is closest to the raw gas stream, i.e. the clean gas phase. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß vor der Reduktionsmittelzugabe im Vorraum des vorge­ schalteten Kessels Rauchgase aus dem Abgasbereich in den Feuerungsbereich zur Reduzierung des O2-Wertes zurückgeführt werden.2. The method according to claim 1, characterized in that before the addition of the reducing agent in the antechamber of the upstream boiler, flue gases from the exhaust gas area are returned to the combustion area to reduce the O 2 value.
DE19873701339 1987-01-19 1987-01-19 Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers Withdrawn DE3701339A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873701339 DE3701339A1 (en) 1987-01-19 1987-01-19 Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873701339 DE3701339A1 (en) 1987-01-19 1987-01-19 Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers

Publications (1)

Publication Number Publication Date
DE3701339A1 true DE3701339A1 (en) 1988-07-28

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ID=6319046

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873701339 Withdrawn DE3701339A1 (en) 1987-01-19 1987-01-19 Process for removing NOx peak loads in flue gas purification downstream of fossil-fuelled combustion boilers

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DE (1) DE3701339A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2502117A1 (en) * 1974-01-21 1975-07-24 Kureha Chemical Ind Co Ltd PROCESS FOR REMOVING NITROGEN OXIDES FROM NITROGEN-CONTAINING GASES IN THE FORM OF AMMONIUM SULPHATE
DE3419611A1 (en) * 1984-05-25 1985-11-28 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous scrubbing of SO2 and NOx from exhaust gases downstream of combustion plants
DE3445203A1 (en) * 1984-12-12 1986-06-12 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous separating out of SO2 and NOx in a single-stage scrubber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2502117A1 (en) * 1974-01-21 1975-07-24 Kureha Chemical Ind Co Ltd PROCESS FOR REMOVING NITROGEN OXIDES FROM NITROGEN-CONTAINING GASES IN THE FORM OF AMMONIUM SULPHATE
DE3419611A1 (en) * 1984-05-25 1985-11-28 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous scrubbing of SO2 and NOx from exhaust gases downstream of combustion plants
DE3445203A1 (en) * 1984-12-12 1986-06-12 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Simultaneous separating out of SO2 and NOx in a single-stage scrubber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VGB-Kraftwerkstechnik 66, H. 12, 1986, S.1150-1159 *

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