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WO2018073239A1 - Method and installation for cleaning pre-heater exhaust gases of an installation for the cement and/or mineral industry - Google Patents

Method and installation for cleaning pre-heater exhaust gases of an installation for the cement and/or mineral industry Download PDF

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Publication number
WO2018073239A1
WO2018073239A1 PCT/EP2017/076463 EP2017076463W WO2018073239A1 WO 2018073239 A1 WO2018073239 A1 WO 2018073239A1 EP 2017076463 W EP2017076463 W EP 2017076463W WO 2018073239 A1 WO2018073239 A1 WO 2018073239A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gases
preheater
temperature
preheater exhaust
regenerative
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
PCT/EP2017/076463
Other languages
German (de)
French (fr)
Inventor
Anna Ivanova DINKOVA
Valentina BORDEI
Timo Stender
Björn Olaf Dr. ASSMANN
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.)
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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Filing date
Publication date
Application filed by ThyssenKrupp AG, ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp AG
Publication of WO2018073239A1 publication Critical patent/WO2018073239A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/864—Removing carbon monoxide or hydrocarbons
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/436—Special arrangements for treating part or all of the cement kiln dust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20723—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B01D2257/602—Mercury or mercury compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7022—Aliphatic hydrocarbons
    • B01D2257/7025—Methane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0233—Other waste gases from cement factories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/65—Employing advanced heat integration, e.g. Pinch technology
    • B01D2259/655—Employing advanced heat integration, e.g. Pinch technology using heat storage materials
    • 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
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods

Definitions

  • the invention relates to a method and a plant for the purification of preheater exhaust gases from the cement and mineral industries by reducing the concentration of gaseous pollutants.
  • inorganic materials such as cement raw meal, limestone, magnesite and dolomite are subjected to a thermal heat treatment, wherein in particular a preheater is used.
  • the material to be treated is preheated by a heat exchange with exhaust gases.
  • the exhaust gases leaving the preheater contain, in addition to a high dust content in the range of usually 50 to 120 g / Nm, a high proportion of nitrogen oxides and carbon monoxide and gaseous organic substances which according to current air pollution regulations must not be blown into the atmosphere without purifying the exhaust gases.
  • the invention has for its object to perform the reduction of the concentration of gaseous pollutants with a reduced energy demand.
  • the preheater exhaust gases are first subjected to a high-temperature filtration to reduce the dust content, followed by a first exhaust treatment by selective catalytic reduction and a subsequent second exhaust treatment by regenerative catalytic oxidation.
  • the plant according to the invention for purifying preheater exhaust gases from the cement and mineral industries by reducing the concentration of gaseous pollutants includes a high-temperature filter for reducing the dust content of the preheater exhaust gases, an SCR catalyst for selective catalytic reduction of the preheater exhaust gases and a regenerative oxidation catalytic converter arranged downstream of the SCR catalytic converter. Plant for regenerative catalytic oxidation of preheater exhaust gases.
  • the preheater exhaust gases in the high-temperature filtration expediently still a temperature in the range of 200 ° C and 400 ° C, preferably from 250 ° C and 350 ° C.
  • the high-temperature filter may in particular have an electrostatic precipitator or filter cartridges.
  • the dust content of the preheater exhaust gases before the high-temperature filtration is usually 120 to 50 g / Nm (grams per standard cubic meter) and in the high temperature filtration is preferably less than 3 g / Nm 3, preferably less than 2 g / Nm 3, most preferably less than 1 g / Nm reduced.
  • a reducing agent in particular an ammonia-containing reducing agent, can be added to the exhaust gas before the SCR catalyst.
  • the formation of the SCR catalyst takes place, for example, with vanadium as the active component.
  • the high-temperature filter for dust reduction can be equipped with filter cartridges, which also form the SCR catalyst at the same time.
  • the catalytic material can be processed directly in the base material of the filter cartridge, so that the preheater exhaust when flowing through the filter cartridge to the catalytic materials.
  • the filter candle may also be coated with catalytic material.
  • an oxidation catalyst doped with noble metals as the active component is used for the subsequent catalytic oxidation.
  • comparatively high temperatures of greater than 400 ° C are required for the oxidation of methane.
  • the temperatures after preheater usually do not have this temperature level. According to the invention, therefore, first the denitration in the SCR catalyst, which is preferably carried out in a temperature window of 250 ° C to 350 ° C.
  • the preheater exhaust gases do not have to be cooled down before dedusting and then raised again to the temperature level required for denitrification.
  • the raising of the temperature of the Vortagerabgase takes place in particular by means of heat displacement in at least one heat storage module, wherein in the flow direction of the preheater exhaust preferably at least one upstream and a downstream heat storage module are provided.
  • the oxidation catalyst may be formed in one or more layers and is equipped for example with precious metals as the active component.
  • activated carbon may be added to the preheater exhaust gases for mercury removal.
  • the oxygen content of the preheater exhaust gases in the first and second exhaust treatment is in the range of 2 to 10%, preferably 3 to 8%, most preferably 4 to 6%.
  • a heat recovery stage for example for exhaust gas flow or water heating
  • the SCR catalyst, the oxidation catalyst and the heat storage modules can in particular be formed with honeycomb bodies, wherein preferably all honeycomb bodies have an identical honeycomb structure.
  • honeycomb bodies have the advantage that they can be flowed through well and at the same time offer a large surface area for the catalytic reactions.
  • FIG. 1 is a block diagram of the system according to the invention for the purification of preheater exhaust gases
  • FIG. 2 shows a block diagram of a plant of the cement and mineral industry with a plant according to the invention for purifying the preheater exhaust gases with an SCR catalyst arranged downstream of the high-temperature filter,
  • FIG. 3 shows a block diagram of a plant of the cement and minerals industry with a plant according to the invention for purifying the preheater exhaust gases with an SCR catalyst integrated in the high-temperature filter,
  • FIG. 4 shows a schematic representation of a regenerative oxidation catalytic converter system according to a first exemplary embodiment
  • Fig. 5 is a schematic representation of a regenerative oxidation catalyst system according to a second embodiment
  • Fig. 6 is a schematic representation of a regenerative oxidation catalyst system according to a third embodiment.
  • the plant for the purification of preheater exhaust gases 1 of the cement and minerals industry shown in FIG. 1 consists of a high-temperature filter 2 for reducing the dust content of the preheater exhaust gases, an SCR catalyst 3 for the selective catalytic reduction of the preheater exhaust gases and a regenerative arranged downstream of the SCR catalytic converter 3 Oxidation catalyst unit 4 for the regenerative catalytic oxidation of preheater exhaust gases.
  • the high-temperature filter 2 is designed in particular as an electrostatic filter or has a plurality of filter cartridges.
  • the preheater exhaust gases 1 flow through the high-temperature filter 2 at a temperature in the range of 200 ° C to 400 ° C, preferably from 250 ° C to 350 ° C. This temperature essentially corresponds to the temperature of the preheater exhaust gases when leaving the preheater. Thus, preferably no previous active cooling takes place by air or water quenching.
  • the dust content of the preheater exhaust gases 1 is reduced in the high-temperature filtration of usually 50 to 120 g / Nm to less than 3 g / Nm 3, preferably less than 2 g / Nm 3, most preferably less than 1 g / Nm 3.
  • the separated dust 5 can be returned to the actual manufacturing process.
  • the dedusted preheater exhaust gases then flow through the SCR catalyst 2 doped, for example, with vanadium, in which case a reducing agent 6, in particular an ammonia-containing reducing agent, is added. Subsequently, a catalytic oxidation of carbon monoxide and gaseous organic pollutants takes place in the regenerative oxidation catalyst system 4.
  • the residual heat remaining in the preheater exhaust gas after the regenerative oxidation catalytic converter system 4 can be utilized in an optional heat recovery stage 7 following the regenerative oxidation catalytic converter system 4, for example for exhaust gas power generation or water heating.
  • Fig. 2 shows a block diagram of a plant of the cement and minerals industry, in which the plant described above for cleaning the preheater exhaust gases is integrated.
  • the plant comprises a preheater 8, a furnace 9 and a cooler 10, wherein the exhaust gases of the furnace 9 flow through the preheater 8 for preheating raw meal 11 and leave the preheater as preheater exhaust gases 1 at a temperature level of typically 200 ° C to 400 ° C.
  • the reducing agent 6 required for the SCR catalyst may be added to the preheater exhaust at or immediately before the SCR catalyst. But there is also the
  • the preheater exhaust gases are used in a raw material mill 12, crushed in the raw material 13 to the raw meal 11 and dried at the same time. This reduces the temperature of the
  • Preheater offgases at about 80 to 120 ° C. If the raw material mill is not available, the preheater exhaust gas is passed through a cooling tower 14, wherein previously activated carbon 15 can be added to reduce mercury.
  • the exhaust gas cooled in the raw material mill or in the cooling tower 14 is then removed from the dust 17 (+ possibly activated carbon) in a dedusting filter 16 before it reaches the atmosphere via a chimney.
  • FIG. 3 shows a block diagram of a plant of the cement and mineral industry, which differs from the embodiment of FIG. 2 only in that the high-temperature filter and the SCR catalyst are formed by a high-temperature catalytic dedusting plant 20.
  • High-temperature dedusting system 20 can be equipped to reduce dust with filter cartridges, which also form the SCR catalyst at the same time.
  • the catalytic material can be processed directly in the base material of the filter cartridge, so that the preheater exhaust gas strikes the catalytic materials when flowing through the filter cartridge.
  • the filter candle may also be coated with catalytic material.
  • FIG. 4 shows a schematic representation of the regenerative oxidation catalytic converter system 4 according to a first exemplary embodiment. It has an example doped with precious metals oxidation catalyst 21, wherein in Flow direction 22 of the preheater exhaust gases 1 each have at least one upstream and a downstream heat storage module 23, 24 are provided, which may be formed in one or more layers.
  • the preheater exhaust gases are intended to be heated by the upstream heat storage module 23 in the flow direction and that to the temperature required for the catalytic oxidation in the range of 400 ° C to 750 ° C. If the heat of the heat storage module 23 is not sufficient for this, a further heating can take place via the fuel gas feed 19.
  • the oxidation on the oxidation catalyst 21 also releases additional heat, so that the temperature of the preheater exhaust gases after the oxidation catalyst is even higher (for example, by 200 to 250 ° C higher). As soon as the heat of the heat storage module 23 is no longer sufficient or after a predetermined time, the flow direction of the preheater exhaust gases through the regenerative oxidation catalyst system is reversed, so that the exhaust gases in the following flow through the heated heat storage module 24, before they reach the oxidation catalyst 21.
  • FIG. 5 shows a variant of the regenerative oxidation catalytic converter system with three channels, which each have a heat exchanger module 23.1, 23.2 or 23.3 and in each case an oxidation catalytic converter 21.1, 21.2 or 21.3.
  • the preheater exhaust gases can always flow through two of the three channels according to the principle explained for Fig. 4.
  • the third channel should primarily prevent emission peaks arising when switching the flaps.
  • FIG. 6 shows a variant of FIG. 5 in which the three channels are equipped in each case with a heat exchanger module 23.1, 23.2 and 23.3, respectively, which have flaps 25.1, 25.2, 25.3, 25.4 and 25.5 with a common oxidation catalyst 21.4. are interconnectable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
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Abstract

In the method according to the invention for cleaning pre-heater exhaust gases of an installation for the cement and/or mineral industry by reducing the concentration of gaseous pollutants, the pre-heater exhaust gases first undergo high-temperature filtration for reducing the dust content, followed by a first exhaust gas treatment by selective catalytic reduction and a subsequent second exhaust gas treatment by regenerative catalytic oxidation. The installation according to the invention for cleaning pre-heater exhaust gases (1) for the cement and mineral industry by reducing the concentration of gaseous pollutants contains a high-temperature filter (2) for reducing the dust content of the pre-heater exhaust gases, an SCR catalytic converter (3) for selective catalytic reduction of the pre-heater exhaust gases, and arranged downstream of the SCR catalytic converter a regenerative oxidation catalytic converter installation (4) for regenerative catalytic oxidation of the pre-heater exhaust gases.

Description

Verfahren und Anlage zur Reinigung von Vorwärmerabgasen einer Anlage der Zement- und/oder Mineralsindustrie  Process and plant for the purification of preheater exhaust gases from a plant of the cement and / or mineral industry

Die Erfindung betrifft ein Verfahren und eine Anlage zur Reinigung von Vorwärmerabgasen aus der Zement- und Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen. The invention relates to a method and a plant for the purification of preheater exhaust gases from the cement and mineral industries by reducing the concentration of gaseous pollutants.

In Anlagen der Zement- und Mineralsindustrie werden anorganische Materialien, wie Zementrohmehl, Kalkstein, Magnesit und Dolomit einer thermischen Wärmebehandlung unterzogen, wobei insbesondere ein Vorwärmer zum Einsatz kommt. Im Vorwärmer wird das zu behandelnde Material durch einen Wärmetausch mit Abgasen vorgewärmt. Die den Vorwärmer verlassenden Abgase enthalten neben einem hohen Staubgehalt im Bereich von üblicherweise 50 bis 120 g/Nm auch einen hohen Anteil an Stickoxiden und Kohlenstoffmonoxid sowie gasförmigen organischen Stoffen, die nach heutigen Luftreinhaltungsvorschriften nicht ohne Reinigung der Abgase in die Atmosphäre geblasen werden dürfen. In plants of the cement and minerals industry, inorganic materials such as cement raw meal, limestone, magnesite and dolomite are subjected to a thermal heat treatment, wherein in particular a preheater is used. In the preheater, the material to be treated is preheated by a heat exchange with exhaust gases. The exhaust gases leaving the preheater contain, in addition to a high dust content in the range of usually 50 to 120 g / Nm, a high proportion of nitrogen oxides and carbon monoxide and gaseous organic substances which according to current air pollution regulations must not be blown into the atmosphere without purifying the exhaust gases.

Aus der DE 20 2010 018 000 Ul ist eine Vorrichtung zur Entstickung von Rauchgasen mit wenigstens einem Katalysator zur katalytischen Reduktion der Stickoxide bekannt, wobei die Abgase in einem Wärmetauscher auf ein erstes Temperaturniveau angehoben werden. Um das für die Entstickung noch fehlende Temperaturniveau zu erreichen, ist weiterhin eine Stufe zur regenerativen Nachverbrennung des Kohlenstoffmonoxids vorgesehen, wobei zusätzliche externe Energie zum Einsatz kommt. From DE 20 2010 018 000 Ul a device for denitrification of flue gases with at least one catalyst for the catalytic reduction of nitrogen oxides is known, wherein the exhaust gases are raised in a heat exchanger to a first temperature level. In order to achieve the still missing temperature level for the denitrification, a stage for the regenerative afterburning of the carbon monoxide is still provided, whereby additional external energy is used.

Der Erfindung liegt die Aufgabe zugrunde, die Reduktion der Konzentration von gasförmigen Schadstoffen mit einem reduzierten Energiebedarf durchzuführen. The invention has for its object to perform the reduction of the concentration of gaseous pollutants with a reduced energy demand.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale der Ansprüche 1 und 9 gelöst. According to the invention this object is solved by the features of claims 1 and 9.

Bei dem erfindungsgemäßen Verfahren zur Reinigung von Vorwärmerabgasen einer Anlage der Zement- und/oder Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen, werden die Vorwärmerabgase zunächst einer Hochtemperaturfiltration zur Reduzierung des Staubgehalts unterzogen, wobei anschließend eine erste Abgasbehandlung durch selektive katalytische Reduktion und eine nachfolgende zweite Abgasbehandlung durch regenerative katalytische Oxidation folgen. In the inventive method for purifying preheater exhaust gases of a plant of the cement and / or minerals industry by reducing the concentration gaseous pollutants, the preheater exhaust gases are first subjected to a high-temperature filtration to reduce the dust content, followed by a first exhaust treatment by selective catalytic reduction and a subsequent second exhaust treatment by regenerative catalytic oxidation.

Die erfindungsgemäße Anlage zur Reinigung von Vorwärmerabgasen der Zement- und Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen beinhaltet einen Hochtemperaturfilter zur Reduzierung des Staubgehalts der Vorwärmerabgase, einen SCR-Katalysator zur selektiven katalytischen Reduktion der Vorwärmerabgase und eine nach dem SCR-Katalysator angeordnete regenerative Oxidationskatalysator-Anlage zur regenerativen katalytischen Oxidation der Vorwärmerabgase. The plant according to the invention for purifying preheater exhaust gases from the cement and mineral industries by reducing the concentration of gaseous pollutants includes a high-temperature filter for reducing the dust content of the preheater exhaust gases, an SCR catalyst for selective catalytic reduction of the preheater exhaust gases and a regenerative oxidation catalytic converter arranged downstream of the SCR catalytic converter. Plant for regenerative catalytic oxidation of preheater exhaust gases.

Die Vorwärmerabgase weisen bei der Hochtemperaturfiltration zweckmäßigerweise noch eine Temperatur im Bereich von 200°C und 400°C, vorzugsweise von 250°C und 350°C auf. Der Hochtemperaturfilter kann dabei insbesondere einen Elektrofilter oder Filterkerzen aufweisen. Der Staubgehalt der Vorwärmerabgase beträgt vor der Hochtemperaturfiltration üblicherweise 120 bis 50 g/Nm (Gramm pro Normkubikmeter) auf und wird bei der Hochtemperaturfiltration vorzugsweise auf weniger als 3 g/Nm 3 , vorzugsweise weniger als 2 g/Nm 3 , höchstvorzugsweise weniger als 1 g/Nm reduziert. Je geringer die Staubbeladung des in den SCR- Katalysator eintretenden Abgases ist, umso geringer ist die dort auftretende Verstopfungsgefahr durch sich ablagernden Staub. Zur Verbesserung der selektiven katalytischen Reduktion kann dem Abgas vor dem SCR-Katalysator ein Reduktionsmittel, insbesondere ein ammoniakhaltiges Reduktionsmittel zugegeben werden. Die Ausbildung des SCR-Katalysators erfolgt beispielsweise mit Vanadium als aktive Komponente. Gemäß einer besonderen Ausgestaltung der Erfindung kann der Hochtemperaturfilter zur Staubreduzierung mit Filterkerzen ausgestattet sein, die gleichzeitig auch den SCR-Katalysator bilden. Dabei kann das katalytische Material direkt im Grundmaterial der Filterkerze verarbeitet sein, sodass das Vorwärmerabgas bei Durchströmung der Filterkerze auf die katalytischen Materialien trifft. Alternativ kann die Filterkerze aber auch mit katalytischem Material beschichtet sein. The preheater exhaust gases in the high-temperature filtration expediently still a temperature in the range of 200 ° C and 400 ° C, preferably from 250 ° C and 350 ° C. The high-temperature filter may in particular have an electrostatic precipitator or filter cartridges. The dust content of the preheater exhaust gases before the high-temperature filtration is usually 120 to 50 g / Nm (grams per standard cubic meter) and in the high temperature filtration is preferably less than 3 g / Nm 3, preferably less than 2 g / Nm 3, most preferably less than 1 g / Nm reduced. The lower the dust load of the exhaust gas entering the SCR catalytic converter, the lower the risk of clogging due to the depositing dust. To improve the selective catalytic reduction, a reducing agent, in particular an ammonia-containing reducing agent, can be added to the exhaust gas before the SCR catalyst. The formation of the SCR catalyst takes place, for example, with vanadium as the active component. According to a particular embodiment of the invention, the high-temperature filter for dust reduction can be equipped with filter cartridges, which also form the SCR catalyst at the same time. In this case, the catalytic material can be processed directly in the base material of the filter cartridge, so that the preheater exhaust when flowing through the filter cartridge to the catalytic materials. Alternatively, however, the filter candle may also be coated with catalytic material.

Für die sich anschließende katalytische Oxidation kommt beispielsweise ein mit Edelmetallen als aktive Komponente dotierter Oxidationskatalysator zur Anwendung. Insbesondere für die Oxidation von Methan sind jedoch vergleichsweise hohe Temperaturen von größer 400°C erforderlich. Die Temperaturen nach Vorwärmer weisen dieses Temperaturniveau jedoch in der Regel nicht auf. Erfindungsgemäß erfolgt daher zunächst die Entstickung im SCR- Katalysator, die vorzugsweise in einem Temperaturfenster von 250°C bis 350°C durchgeführt wird. Durch die Verwendung der Hochtemperaturfiltration müssen die Vorwärmerabgase vor der Entstaubung nicht erst abgekühlt und anschließend wieder auf das für die Entstickung erforderliche Temperaturniveau angehoben werden. For the subsequent catalytic oxidation, for example, an oxidation catalyst doped with noble metals as the active component is used. In particular, for the oxidation of methane, however, comparatively high temperatures of greater than 400 ° C are required. However, the temperatures after preheater usually do not have this temperature level. According to the invention, therefore, first the denitration in the SCR catalyst, which is preferably carried out in a temperature window of 250 ° C to 350 ° C. By using the high-temperature filtration, the preheater exhaust gases do not have to be cooled down before dedusting and then raised again to the temperature level required for denitrification.

Es ist daher erst für katalytische Oxidation zweckmäßig, die Temperatur der Vorwärmerabgase anzuheben und zwar auf einen Temperaturbereich von 350°C bis 780°C, vorzugsweise 400°C bis 700°C, höchstvorzugsweise 500°C bis 600°C. It is therefore only appropriate for catalytic oxidation to increase the temperature of the preheater exhaust gases and indeed to a temperature range of 350 ° C to 780 ° C, preferably 400 ° C to 700 ° C, most preferably 500 ° C to 600 ° C.

Die Anhebung der Temperatur der Vorwärmerabgase erfolgt dabei insbesondere mittels Wärmeverschiebung in wenigstens einem Wärmespeichermodul, wobei in Strömungsrichtung der Vorwärmerabgase vorzugsweise jeweils wenigstens ein vor- und ein nachgeordnetes Wärmespeichermodul vorgesehen sind. Der Oxidationskatalysator kann ein- oder mehrlagig ausgebildet sein und ist beispielsweise mit Edelmetallen als aktive Komponente ausgestattet. The raising of the temperature of the Vorwärmerabgase takes place in particular by means of heat displacement in at least one heat storage module, wherein in the flow direction of the preheater exhaust preferably at least one upstream and a downstream heat storage module are provided. The oxidation catalyst may be formed in one or more layers and is equipped for example with precious metals as the active component.

Den Vorwärmerabgasen kann gewünschtenfalls nach der regenerativen katalytischen Oxidation Aktivkohle zur Quecksilberab Scheidung zugegeben wird. Des Weiteren liegt der Sauer stoffgehalt der Vorwärmerabgase bei der ersten und zweiten Abgasbehandlung im Bereich von 2 bis 10%, vorzugsweise 3 bis 8%, höchstvorzugsweise 4 bis 6%. Zur Nutzung von im Vorwärmerabgas noch enthaltender Restwärme kann sich an die regenerative Oxidationskatalysator-Anlage eine Wärmerückgewinnungsstufe (beispielsweise zur Abgasver Strömung oder Wassererwärmung) anschließen. If desired, after the regenerative catalytic oxidation, activated carbon may be added to the preheater exhaust gases for mercury removal. Furthermore, the oxygen content of the preheater exhaust gases in the first and second exhaust treatment is in the range of 2 to 10%, preferably 3 to 8%, most preferably 4 to 6%. To use residual heat still contained in the preheater exhaust gas, a heat recovery stage (for example for exhaust gas flow or water heating) can be connected to the regenerative oxidation catalytic converter system.

Der SCR-Katalysator, der Oxidationskatalysator und die Wärmespeichermodule können insbesondere mit Wabenkörpern ausgebildet sein, wobei vorzugsweise alle Wabenkörper eine identische Wabenstruktur aufweisen. Die Wabenkörper haben den Vorteil, dass sie gut durchströmt werden können und gleichzeitig eine große Oberfläche für die katalytischen Reaktionen bieten. The SCR catalyst, the oxidation catalyst and the heat storage modules can in particular be formed with honeycomb bodies, wherein preferably all honeycomb bodies have an identical honeycomb structure. The honeycomb bodies have the advantage that they can be flowed through well and at the same time offer a large surface area for the catalytic reactions.

Weitere Ausgestaltungen der Erfindung werden im Folgenden anhand der weiteren Beschreibung und der Zeichnung näher erläutert. Further embodiments of the invention are explained in more detail below with reference to the further description and the drawing.

In der Zeichnung zeigen In the drawing show

Fig. 1 ein Blockschaltbild der erfindungsgemäßen Anlage zur Reinigung von Vorwärmerabgasen, 1 is a block diagram of the system according to the invention for the purification of preheater exhaust gases,

Fig. 2 ein Blockschaltbild einer Anlage der Zement- und Mineralsindustrie mit einer erfindungsgemäßen Anlage zur Reinigung der Vorwärmerabgase mit einem dem Hochtemperaturfilter nachgeordneten SCR-Katalysator, 2 shows a block diagram of a plant of the cement and mineral industry with a plant according to the invention for purifying the preheater exhaust gases with an SCR catalyst arranged downstream of the high-temperature filter,

Fig. 3 ein Blockschaltbild einer Anlage der Zement- und Mineralsindustrie mit einer erfindungsgemäßen Anlage zur Reinigung der Vorwärmerabgase mit einem im Hochtemperaturfilter integrierten SCR-Katalysator, 3 shows a block diagram of a plant of the cement and minerals industry with a plant according to the invention for purifying the preheater exhaust gases with an SCR catalyst integrated in the high-temperature filter,

Fig. 4 eine schematische Darstellung einer regenerativen Oxidationskatalysator- Anlage gemäß einem ersten Ausführungsbeispiel, 4 shows a schematic representation of a regenerative oxidation catalytic converter system according to a first exemplary embodiment,

Fig. 5 eine schematische Darstellung einer regenerativen Oxidationskatalysator- Anlage gemäß einem zweiten Ausführungsbeispiel und Fig. 5 is a schematic representation of a regenerative oxidation catalyst system according to a second embodiment and

Fig. 6 eine schematische Darstellung einer regenerativen Oxidationskatalysator- Anlage gemäß einem dritten Ausführungsbeispiel. Die in Fig. 1 dargestellte Anlage zur Reinigung von Vorwärmerabgasen 1 der Zement- und Mineralsindustrie besteht aus einem Hochtemperaturfilter 2 zur Reduzierung des Staubgehalts der Vorwärmerabgase, einem SCR-Katalysator 3 zur selektiven katalytischen Reduktion der Vorwärmerabgase und einer nach dem SCR- Katalysator 3 angeordneten regenerativen Oxidationskatalysator-Anlage 4 zur regenerativen katalytischen Oxidation der Vorwärmerabgase. Fig. 6 is a schematic representation of a regenerative oxidation catalyst system according to a third embodiment. The plant for the purification of preheater exhaust gases 1 of the cement and minerals industry shown in FIG. 1 consists of a high-temperature filter 2 for reducing the dust content of the preheater exhaust gases, an SCR catalyst 3 for the selective catalytic reduction of the preheater exhaust gases and a regenerative arranged downstream of the SCR catalytic converter 3 Oxidation catalyst unit 4 for the regenerative catalytic oxidation of preheater exhaust gases.

Der Hochtemperaturfilter 2 ist insbesondere als Elektrofilter ausgebildet oder weist eine Vielzahl von Filterkerzen auf. Die Vorwärmerabgase 1 durchströmen den Hochtemperaturfilter 2 mit einer Temperatur im Bereich von 200°C bis 400°C, vorzugsweise von 250°C bis 350°C. Diese Temperatur entspricht im Wesentlichen der Temperatur der Vorwärmerabgase beim Verlassen des Vorwärmers. Es findet somit vorzugsweise keine vorhergehende aktive Abkühlung durch Luft- oder Wasserquenchung statt. Der Staubgehalt der Vorwärmerabgase 1 wird bei der Hochtemperaturfiltration von üblicherweise 50 bis 120 g/Nm auf weniger als 3 g/Nm 3 , vorzugsweise weniger als 2 g/Nm 3 , höchstvorzugsweise weniger als 1 g/Nm 3 reduziert. Der abgeschiedene Staub 5 kann wieder dem eigentlichen Herstellungsprozess zurückgeführt werden. The high-temperature filter 2 is designed in particular as an electrostatic filter or has a plurality of filter cartridges. The preheater exhaust gases 1 flow through the high-temperature filter 2 at a temperature in the range of 200 ° C to 400 ° C, preferably from 250 ° C to 350 ° C. This temperature essentially corresponds to the temperature of the preheater exhaust gases when leaving the preheater. Thus, preferably no previous active cooling takes place by air or water quenching. The dust content of the preheater exhaust gases 1 is reduced in the high-temperature filtration of usually 50 to 120 g / Nm to less than 3 g / Nm 3, preferably less than 2 g / Nm 3, most preferably less than 1 g / Nm 3. The separated dust 5 can be returned to the actual manufacturing process.

Anschließend durchströmen die entstaubten Vorwärmerabgase den beispielsweise mit Vanadium dotierten SCR-Katalysator 2, wobei ein Reduktionsmittel 6, insbesondere ein ammoniakhaltiges Reduktionmittel zugegeben wird. Anschließend findet in der regenerativen Oxidationskatalysator-Anlage 4 eine katalytische Oxidation von Kohlenmonoxid und gasförmigen organischen Schadstoffen statt. Die im Vorwärmerabgas nach der regenerativen Oxidationskatalysator-Anlage 4 noch enthaltende Restwärme kann in einer sich an die regenerative Oxidationskatalysator- Anlage 4 anschließenden optionalen Wärmerückgewinnung s stufe 7, beispielsweise zur Abgasverstromung oder Wassererwärmung, genutzt werden. The dedusted preheater exhaust gases then flow through the SCR catalyst 2 doped, for example, with vanadium, in which case a reducing agent 6, in particular an ammonia-containing reducing agent, is added. Subsequently, a catalytic oxidation of carbon monoxide and gaseous organic pollutants takes place in the regenerative oxidation catalyst system 4. The residual heat remaining in the preheater exhaust gas after the regenerative oxidation catalytic converter system 4 can be utilized in an optional heat recovery stage 7 following the regenerative oxidation catalytic converter system 4, for example for exhaust gas power generation or water heating.

Fig. 2 zeigt ein Blockschaltbild einer Anlage der Zement- und Mineralsindustrie, bei der die oben beschriebene Anlage zur Reinigung der Vorwärmerabgase integriert ist. Die Anlage umfasst einen Vorwärmer 8, einen Ofen 9 und einen Kühler 10, wobei die Abgase des Ofens 9 den Vorwärmer 8 zum Vorwärmen von Rohmehl 11 durchströmen und den Vorwärmer als Vorwärmerabgase 1 mit einem Temperaturniveau von typischerweise 200°C bis 400°C verlassen. Das für den SCR- Katalysator erforderliche Reduktionsmittel 6 kann am oder unmittelbar vor dem SCR-Katalysator dem Vorwärmerabgas zugegeben werden. Es besteht aber auch dieFig. 2 shows a block diagram of a plant of the cement and minerals industry, in which the plant described above for cleaning the preheater exhaust gases is integrated. The plant comprises a preheater 8, a furnace 9 and a cooler 10, wherein the exhaust gases of the furnace 9 flow through the preheater 8 for preheating raw meal 11 and leave the preheater as preheater exhaust gases 1 at a temperature level of typically 200 ° C to 400 ° C. The reducing agent 6 required for the SCR catalyst may be added to the preheater exhaust at or immediately before the SCR catalyst. But there is also the

Möglichkeit das Reduktionsmittel 6 am oberen Ende des Vorwärmers 8 einzubringen. Possibility to introduce the reducing agent 6 at the upper end of the preheater 8.

Nach der optionalen Wärmerückgewinnung s stufe 7 werden die Vorwärmerabgase in einer Rohmaterialmühle 12 genutzt, in der Rohmaterial 13 zu dem Rohmehl 11 zerkleinert und gleichzeitig getrocknet wird. Dabei reduziert sich die Temperatur derAfter the optional heat recovery step s 7, the preheater exhaust gases are used in a raw material mill 12, crushed in the raw material 13 to the raw meal 11 and dried at the same time. This reduces the temperature of the

Vorwärmerabgase auf etwa 80 bis 120 °C. Steht die Rohmaterialmühle nicht zur Verfügung wird das Vorwärmerabgas über einen Kühlturm 14 geleitet, wobei vorher Aktivkohle 15 zur Quecksilberreduzierung zugegeben werden kann. Preheater offgases at about 80 to 120 ° C. If the raw material mill is not available, the preheater exhaust gas is passed through a cooling tower 14, wherein previously activated carbon 15 can be added to reduce mercury.

Das in der Rohmaterialmühle bzw. im Kühlturm 14 abgekühlte Abgas wird anschließend in einem Entstaubungsfilter 16 vom Staub 17 (+ ggf. Aktivkohle) befreit, bevor es über einen Kamin in die Atmosphäre gelangt. The exhaust gas cooled in the raw material mill or in the cooling tower 14 is then removed from the dust 17 (+ possibly activated carbon) in a dedusting filter 16 before it reaches the atmosphere via a chimney.

Fig. 3 zeigt ein Blockschaltbild einer Anlage der Zement- und Mineralsindustrie, welches sich von dem Ausführungsbeispiel der Fig. 2 nur dadurch unterscheidet, dass der Hochtemperaturfilter und der SCR-Katalysator durch eine katalytische Hochtemperatur-Entstaubungsanlage 20 gebildet werden. Die katalytische3 shows a block diagram of a plant of the cement and mineral industry, which differs from the embodiment of FIG. 2 only in that the high-temperature filter and the SCR catalyst are formed by a high-temperature catalytic dedusting plant 20. The catalytic

Hochtemperatur-Entstaubungsanlage 20 kann dabei zur Staubreduzierung mit Filterkerzen ausgestattet sein, die gleichzeitig auch den SCR-Katalysator bilden. Dabei kann das katalytische Material direkt im Grundmaterial der Filterkerze verarbeitet sein, sodass das Vorwärmerabgas bei Durchströmung der Filterkerze auf die katalytischen Materialien trifft. Alternativ kann die Filterkerze aber auch mit katalytischem Material beschichtet sein. High-temperature dedusting system 20 can be equipped to reduce dust with filter cartridges, which also form the SCR catalyst at the same time. In this case, the catalytic material can be processed directly in the base material of the filter cartridge, so that the preheater exhaust gas strikes the catalytic materials when flowing through the filter cartridge. Alternatively, however, the filter candle may also be coated with catalytic material.

Fig. 4 zeigt eine schematische Darstellung der regenerativen Oxidationskatalysator- Anlage 4 gemäß einem ersten Ausführungsbeispiel. Sie weist einen beispielsweise mit Edelmetallen dotierten Oxidationskatalysator 21 auf, wobei in Strömungsrichtung 22 der Vorwärmerabgase 1 jeweils wenigstens ein vor- und ein nachgeordnetes Wärme speichermodul 23, 24 vorgesehen sind, welche ein- oder mehrlagig ausgebildet sein können. Die Vorwärmerabgase sollen sich durch das in Strömungsrichtung vorgelagerte Wärmespeichermodul 23 erwärmen und zwar auf die für die katalytische Oxidation erforderliche Temperatur im Bereich von 400°C bis 750°C. Sollte die Wärme des Wärmespeichermoduls 23 hierfür nicht ausreichen, kann über die Brenngasaufgabe 19 eine weitere Erwärmung erfolgen. Die Oxidation am Oxidationskatalysator 21 setzt darüber hinaus zusätzliche Wärme frei, so dass die Temperatur der Vorwärmerabgase nach dem Oxidationskatalysator sogar noch höher ist (beispielsweise um 200 bis 250°C höher). Die Vorwärmerabgase erwärmen im Folgenden das Wärmespeichermodul 24. Sobald die Wärme des Wärmespeichermoduls 23 nicht mehr ausreichende ist oder nach einer vorgegebenen Zeit, wird die Strömungsrichtung der Vorwärmerabgase durch die regenerative Oxidationskatalysator- Anlage umgekehrt, sodass die Abgase im Folgenden zunächst das aufgeheizte Wärmespeichermodul 24 durchströmen, bevor sie zum Oxidationskatalysator 21 gelangen. 4 shows a schematic representation of the regenerative oxidation catalytic converter system 4 according to a first exemplary embodiment. It has an example doped with precious metals oxidation catalyst 21, wherein in Flow direction 22 of the preheater exhaust gases 1 each have at least one upstream and a downstream heat storage module 23, 24 are provided, which may be formed in one or more layers. The preheater exhaust gases are intended to be heated by the upstream heat storage module 23 in the flow direction and that to the temperature required for the catalytic oxidation in the range of 400 ° C to 750 ° C. If the heat of the heat storage module 23 is not sufficient for this, a further heating can take place via the fuel gas feed 19. The oxidation on the oxidation catalyst 21 also releases additional heat, so that the temperature of the preheater exhaust gases after the oxidation catalyst is even higher (for example, by 200 to 250 ° C higher). As soon as the heat of the heat storage module 23 is no longer sufficient or after a predetermined time, the flow direction of the preheater exhaust gases through the regenerative oxidation catalyst system is reversed, so that the exhaust gases in the following flow through the heated heat storage module 24, before they reach the oxidation catalyst 21.

Fig. 5 zeigt eine Variante der regenerativen Oxidationskatalysator- Anlage mit drei Kanälen, die jeweils ein Wärmetauschermodul 23.1, 23.2 bzw. 23.3 sowie jeweils einen Oxidationskatalysator 21.1, 21.2 bzw. 21.3 aufweisen. Über ein nicht näher dargestelltes Klappensystem können die Vorwärmerabgase immer durch zwei der drei Kanäle entsprechend dem zu Fig. 4 erläuterten Prinzip strömen. Der dritte Kanal soll vorrangig verhindern, dass beim Umschalten der Klappen Emissionsspitzen entstehen. 5 shows a variant of the regenerative oxidation catalytic converter system with three channels, which each have a heat exchanger module 23.1, 23.2 or 23.3 and in each case an oxidation catalytic converter 21.1, 21.2 or 21.3. About a non-illustrated flap system, the preheater exhaust gases can always flow through two of the three channels according to the principle explained for Fig. 4. The third channel should primarily prevent emission peaks arising when switching the flaps.

Fig. 6 zeigt schließlich eine Variante zur Fig. 5 bei der die drei Kanäle mit jeweils einem Wärmetauschermodul 23.1, 23.2 bzw. 23.3 bestückt sind, welche über Klappen 25.1, 25.2, 25.3, 25.4 und 25.5 mit einem gemeinsamen Oxidationskatalysator 21.4. verschaltbar sind. Finally, FIG. 6 shows a variant of FIG. 5 in which the three channels are equipped in each case with a heat exchanger module 23.1, 23.2 and 23.3, respectively, which have flaps 25.1, 25.2, 25.3, 25.4 and 25.5 with a common oxidation catalyst 21.4. are interconnectable.

Claims

Patentansprüche: claims: 1. Verfahren zur Reinigung von Vorwärmerabgasen (1) einer Anlage der Zement- und/oder Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen, wobei die Vorwärmerabgase zunächst einer Hochtemperaturfiltration zur Reduzierung des Staubgehalts unterzogen werden und anschließend eine erste Abgasbehandlung durch selektive katalytische Reduktion und eine nachfolgende zweite Abgasbehandlung durch regenerative katalytische Oxidation folgen, wobei die Vorwärmerabgase (1) bei der Hochtemperaturfiltration eine Temperatur im Bereich von 200°C und 450°C aufweisen. 1. A process for the purification of preheater exhaust gases (1) a plant of the cement and / or minerals industry by reducing the concentration of gaseous pollutants, the preheater exhaust gases are first subjected to a high-temperature filtration to reduce the dust content and then a first exhaust gas treatment by selective catalytic reduction and a subsequent second exhaust treatment by regenerative catalytic oxidation, wherein the preheater exhaust gases (1) in the high-temperature filtration have a temperature in the range of 200 ° C and 450 ° C. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Staubgehalt der Vorwärmerabgase (1) bei der Hochtemperaturfiltration auf weniger als 3 g/Nm reduziert wird. 2. The method according to claim 1, characterized in that the dust content of the preheater exhaust gases (1) is reduced in the high-temperature filtration to less than 3 g / Nm. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dem3. The method according to claim 1, characterized in that the Vorwärmerabgas (1) vor der selektiven katalytischen Reduktion ein Reduktionsmittel zugegeben wird. Preheater off-gas (1) before the selective catalytic reduction, a reducing agent is added. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Temperatur der Vorwärmerabgase (1) bei der regenerativen katalytischen Oxidation auf einen Temperaturbereich von 350°C bis 780°C angehoben wird. 4. The method according to claim 1, characterized in that the temperature of the preheater exhaust gases (1) is raised in the regenerative catalytic oxidation to a temperature range of 350 ° C to 780 ° C. 5. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Anhebung der Temperatur der Vorwärmerabgase (1) mittels Wärmeverschiebung in wenigstens einem Wärmespeichermodul (23, 24) und optional durch externen Brennstoff erfolgt. 5. The method according to claim 5, characterized in that the raising of the temperature of the preheater exhaust gases (1) by means of heat displacement in at least one heat storage module (23, 24) and optionally takes place by external fuel. 6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der6. The method according to claim 1, characterized in that the Sauers toffgehalt der Vorwärmerabgase (1) bei der ersten und zweiten Abgasbehandlung im Bereich von 2 bis 10% liegt. Sauer toffgehalt the preheater exhaust gases (1) in the first and second exhaust treatment in the range of 2 to 10%. 7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dem7. The method according to claim 1, characterized in that the Vorwärmerabgas (1) nach der regenerativen katalytischen Oxidation Aktivkohle (15) zur Quecksilberab Scheidung zugegeben wird. Preheater offgas (1) after regenerative catalytic oxidation activated carbon (15) is added to the mercury removal process. 8. Anlage zur Reinigung von Vorwärmerabgasen (1) einer Anlage der Zement- und Mineralsindustrie durch Reduktion der Konzentration von gasförmigen Schadstoffen mit 8. Plant for the purification of preheater exhaust gases (1) a plant of the cement and minerals industry by reducing the concentration of gaseous pollutants with - einem Hochtemperaturfilter (2) zur Reduzierung des Staubgehalts der Vorwärmerabgase im Temperaturbereich von 200°C und 450°C, a high-temperature filter (2) for reducing the dust content of the preheater exhaust gases in the temperature range of 200 ° C and 450 ° C, - einem SCR-Katalysator (3) zur selektiven katalytischen Reduktion der Vorwärmerabgase und - An SCR catalyst (3) for the selective catalytic reduction of the preheater exhaust gases and - einer nach dem SCR-Katalysator (3) angeordneten regenerativen Oxidationskatalysator-Anlage (4) zur regenerativen katalytischen Oxidation der Vorwärmerabgase. - A downstream of the SCR catalyst (3) arranged regenerative oxidation catalyst system (4) for the regenerative catalytic oxidation of the preheater exhaust gases. 9. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass der9. Plant according to claim 8, characterized in that the Hochtemperaturfilter (2) einen Elektrofilter oder Filterkerzen aufweist. High temperature filter (2) has an electrostatic precipitator or filter cartridges. 10. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass die regenerative Oxidationskatalysator-Anlage (4) einen Oxidationskatalysator (21) sowie in Strömungsrichtung der Vorwärmerabgase (1) jeweils wenigstens ein vor- und ein nachgeordnetes Wärmespeichermodul (23, 24) umfasst. 10. Installation according to claim 8, characterized in that the regenerative oxidation catalyst system (4) comprises an oxidation catalyst (21) and in the flow direction of the preheater exhaust gases (1) each have at least one upstream and a downstream heat storage module (23, 24). 11. Anlage nach Anspruch 10, dadurch gekennzeichnet, dass das erste und das zweite Wärmespeichermodul (23, 24) ein oder mehrlagig ausgebildet sind. 11. Plant according to claim 10, characterized in that the first and the second heat storage module (23, 24) are formed one or more layers. 12. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass sich an die regenerative Oxidationskatalysator-Anlage (4) eine Wärmerückgewinnung s stufe (7) zur Nutzung von im Vorwärmerabgas noch enthaltender Restwärme anschließt. 12. Plant according to claim 8, characterized in that the regenerative oxidation catalyst system (4) heat recovery stage s (7) connects to the use of remaining in the preheater exhaust residual heat. 13. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass der13. Plant according to claim 8, characterized in that the Hochtemperaturfilter (2) zur Staubreduzierung mit Filterkerzen ausgestattet ist und der SCR-Katalysator (3) durch katalytische Filterkerzen gebildet wird. High-temperature filter (2) for dust reduction is equipped with filter cartridges and the SCR catalyst (3) is formed by catalytic filter cartridges. 14. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass der SCR-Katalysator (3), der Oxidationskatalysator (21) und die Wärmespeichermodule (23, 24) mit Wabenkörpern ausgebildet sind, wobei vorzugsweise alle Wabenkörper eine identische Wabenstruktur aufweisen. 14. Plant according to claim 8, characterized in that the SCR catalyst (3), the oxidation catalyst (21) and the heat storage modules (23, 24) are formed with honeycomb bodies, wherein preferably all the honeycomb body having an identical honeycomb structure.
PCT/EP2017/076463 2016-10-17 2017-10-17 Method and installation for cleaning pre-heater exhaust gases of an installation for the cement and/or mineral industry Ceased WO2018073239A1 (en)

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