WO2010021237A1 - Appareil de traitement d'un gaz de décharge et système pour traiter un gaz de décharge - Google Patents

Appareil de traitement d'un gaz de décharge et système pour traiter un gaz de décharge Download PDF

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Publication number
WO2010021237A1
WO2010021237A1 PCT/JP2009/063819 JP2009063819W WO2010021237A1 WO 2010021237 A1 WO2010021237 A1 WO 2010021237A1 JP 2009063819 W JP2009063819 W JP 2009063819W WO 2010021237 A1 WO2010021237 A1 WO 2010021237A1
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Prior art keywords
exhaust gas
mercury
denitration catalyst
gas treatment
hydrogen chloride
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English (en)
Japanese (ja)
Inventor
利久磨 四條
展康 坂田
敏浩 佐藤
盛紀 村上
展行 鵜飼
勝己 野地
正志 清澤
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Publication of WO2010021237A1 publication Critical patent/WO2010021237A1/fr
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    • 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
    • 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
    • B01D53/8631—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • 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
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/502—Hydrochloric acid
    • 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
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • 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
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • 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
    • B01D2255/102—Platinum group metals
    • B01D2255/1025—Rhodium
    • 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
    • B01D2255/102—Platinum group metals
    • B01D2255/1026—Ruthenium
    • 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
    • B01D2255/102—Platinum group metals
    • B01D2255/1028—Iridium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—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
    • B01D2255/20707—Titanium
    • 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
    • B01D2255/20715—Zirconium
    • 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
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/2073—Manganese
    • 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
    • B01D2255/20738—Iron
    • 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
    • B01D2255/20746—Cobalt
    • 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
    • B01D2255/20753—Nickel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
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    • B01D2255/20761—Copper
    • 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
    • B01D2255/20769—Molybdenum
    • 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
    • B01D2255/20776—Tungsten
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/30—Silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/902—Multilayered catalyst
    • B01D2255/9025—Three layers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/60—Heavy metals; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/10—Catalytic reduction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/40—Sorption with wet devices, e.g. scrubbers

Definitions

  • the present invention relates to an exhaust gas treatment device and an exhaust gas treatment system for oxidizing mercury in exhaust gas discharged from a combustion device.
  • coal fired boilers are provided with a wet desulfurization device for removing sulfur content in the exhaust gas.
  • a desulfurization device for removing sulfur content in the exhaust gas.
  • chlorine (Cl) content in the exhaust gas increases, the proportion of divalent metal mercury (Hg) soluble in water It is widely known that mercury tends to be collected by the desulfurization apparatus.
  • a removal method using an adsorbent such as activated carbon or a selenium filter is known.
  • an adsorbent such as activated carbon or a selenium filter
  • a special adsorption removal means is required, and a large-capacity exhaust gas such as power plant exhaust gas is treated. Not suitable for.
  • a chlorinating agent is gas-sprayed in the upstream process of the high-temperature denitration catalyst layer in the flue, and mercury is oxidized (chlorinated) on the denitration catalyst to produce water.
  • a method is proposed in which the product is converted to a characteristic mercury chloride and then absorbed by a downstream wet desulfurization apparatus (see, for example, Patent Document 1 and Patent Document 2).
  • an apparatus and a technique for spraying a gas to a flue are put into practical use by NH 3 spraying of a denitration catalyst layer and gas spraying of a chlorinating agent.
  • Fig. 5 shows a schematic diagram of an exhaust gas treatment system for a coal fired boiler.
  • the conventional exhaust gas treatment system 100 removes nitrogen oxide (NOx) in the exhaust gas 12 from the coal-fired boiler 11 that supplies coal as the fuel F, and chlorinates in the exhaust gas 12.
  • NOx nitrogen oxide
  • Denitration catalyst layer 13 that oxidizes mercury (Hg) by spraying hydrogen chloride (HCl) as an agent, air preheater 14 that recovers heat in exhaust gas 12 after nitrogen oxide (NOx) removal, and heat recovery
  • An electric precipitator 15 that removes soot and dust in the exhaust gas 12 after
  • a desulfurization device 16 that removes sulfur oxide (SOx) and mercury (Hg) in the exhaust gas 12 after dust removal, and purification of the exhaust gas 12 after desulfurization
  • a chimney 18 that is discharged to the outside as the gas 17 is provided.
  • the flue 19 on the upstream side of the denitration catalyst layer 13 is provided with an injection site of hydrochloric acid (HCl), and the hydrochloric acid (liquid) stored in the hydrochloric acid (liquid HCl) supply unit 20 is sprayed with hydrogen chloride. Vaporized in the section 21 and sprayed as hydrogen chloride on the exhaust gas 12 through a hydrogen chloride (HCl) spray nozzle.
  • HCl hydrogen chloride
  • an ammonia (NH 3 ) injection point is provided in the upstream flue 19 of the denitration catalyst layer 13, and ammonia supplied from the NH 3 supply unit 29 is sprayed on the exhaust gas 12 by an ammonia spray nozzle. Nitrogen oxide (NOx) is reduced.
  • reference numeral 25 denotes an oxidation-reduction potential measurement control device (ORP controller), and 26 denotes air.
  • the exhaust gas 12 from the coal-fired boiler 11 is supplied to the denitration catalyst layer 13 and then heated to the air preheater 14 by heat exchange, and then supplied to the electrostatic precipitator 15 and further desulfurized. After being supplied to the device 16, it is discharged to the atmosphere as purified gas 17.
  • the mercury concentration of exhaust gas after wet desulfurization is measured with a mercury monitor, and based on the mercury concentration after desulfurization, the chlorinating agent The supply amount is adjusted (for example, see Patent Document 2).
  • NH 3 is used for the reduction denitration of NOx
  • NH 3 ammonia (NH 3) supplied from the NH 3 supply unit 29 via the spray nozzle is sprayed into the flue gas 12, in the denitration catalyst layer 13, the following formula As described above, NOx is replaced by nitrogen (N 2 ) by a reduction reaction, and denitration is performed.
  • NOx is replaced by nitrogen (N 2 ) by a reduction reaction, and denitration is performed.
  • hydrogen chloride is used for mercury oxidation, and hydrogen chloride used as a chlorinating agent is supplied from an HCl supply unit 20 to a hydrogen chloride (HCl) spray unit 21 where hydrochloric acid is vaporized and hydrogen chloride (HCl) is supplied.
  • HCl hydrogen chloride
  • the denitration catalyst layer 13 oxidizes (chlorinates) low-solubility Hg on the denitration catalyst as shown in the following formula, and has high water-soluble mercury chloride. It is converted to (HgCl 2 ), and Hg contained in the exhaust gas 12 is removed by the desulfurization device 16 provided on the downstream side.
  • the fuel when coal or heavy oil is used as the fuel, the fuel contains Cl because the fuel contains Cl, but the Cl content is different depending on the type of fuel, and the Cl concentration in the exhaust gas is different. Since it is difficult to control the amount of HCl, it is preferable that Hg is reliably removed by adding more than a necessary amount of HCl or the like to the upstream of the exhaust gas treatment apparatus 10.
  • the denitration catalyst layer 13 uses, for example, a honeycomb shape having a rectangular passage 28 arranged in a lattice and carrying a denitration catalyst, and the cross-sectional shape of the passage is, for example, a triangular shape or a square shape.
  • the passage is made up of polygonal shapes.
  • an object of the present invention is to provide an exhaust gas treatment apparatus and an exhaust gas treatment system that can always stably perform oxidation performance of mercury in exhaust gas.
  • the first invention of the present invention for solving the above-described problem has a denitration catalyst unit that removes nitrogen oxides in exhaust gas from a boiler and oxidizes mercury by spraying a chlorinating agent into the exhaust gas.
  • the supply position for supplying the chlorinating agent is in the exhaust gas treatment apparatus characterized in that the cross-sectional shape of the upstream-side flue of the denitration catalyst part is a uniform part in the axial direction. .
  • the exhaust gas processing apparatus according to the first aspect, wherein the portion having a uniform cross-sectional shape is a vertical portion of a front-side flue of the denitration catalyst portion.
  • the boiler a chlorinating agent supply unit for injecting a chlorinating agent into the exhaust gas discharged to the flue downstream of the boiler, the first or second exhaust gas treatment device,
  • An exhaust gas treatment system having a desulfurization device for removing sulfur oxides in exhaust gas and a chimney for discharging the desulfurized gas to the outside.
  • an exhaust gas treatment system according to the third aspect of the present invention, further comprising an ammonia supply unit for introducing ammonia to the exhaust gas discharged to the flue downstream of the boiler.
  • the chlorinating agent can be supplied regardless of the exhaust gas flow conditions, and the required mercury oxidation performance can be ensured.
  • FIG. 1 is a schematic view showing an exhaust gas treatment apparatus according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing a part of the configuration of the denitration catalyst layer.
  • FIG. 3 is a relationship diagram between the hydrogen chloride concentration and the mercury oxidation rate depending on the hydrogen chloride charging position according to the test example of the present invention.
  • FIG. 4 is a graph showing the relationship between the hydrogen chloride concentration and the mercury oxidation rate depending on the hydrogen chloride charging position according to the comparative example of the present invention.
  • FIG. 5 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler.
  • FIG. 1 is a schematic diagram illustrating an exhaust gas treatment apparatus according to an embodiment
  • FIG. 2 is a perspective view illustrating a part of the configuration of the exhaust gas treatment apparatus according to the embodiment.
  • description will be made by taking hydrogen chloride as an example of the chlorinating agent. 1 is a part of the exhaust gas treatment system shown in FIG.
  • the exhaust gas treatment apparatus 10 removes nitrogen oxides (NOx) in the exhaust gas 12 from the boiler 11, and the chlorinating agent in the exhaust gas 12
  • the supply position for supplying the chlorinating agent is an exhaust gas flue (hereinafter referred to as “smoke” on the upstream side of the denitration catalyst part. (Referred to as hydrogen chloride supply region 41 in FIG. 1).
  • the denitration catalyst layer 13 is formed of three catalyst layers 13-1 to 13-3, but the present invention is not limited to this.
  • a rectifying plate 30 for rectifying the exhaust gas 12 after hydrogen chloride is supplied is disposed on the upstream side of the denitration catalyst layer 13 so that the exhaust gas 12 supplied to the catalyst is rectified.
  • the distance 42 from the ammonia (NH 3 ) charging position to the ammonia side of the hydrogen chloride supply region 41 is at least 3 m or more. This is to prevent mixing of hydrogen chloride and ammonia.
  • FIG. 2 is a perspective view of FIG. 1, but the rectifying plate 30 disposed on the upstream side of the denitration catalyst layer 13 is omitted.
  • a first monitoring unit 31 (31a to 31d) that measures at least one of exhaust gas temperature, exhaust gas flow velocity distribution, and hydrogen chloride concentration distribution
  • a second monitoring unit 32 (32a, 32b) that measures the amount of mercury in the exhaust gas is disposed on the outlet side of the denitration catalyst layer 13, and the first monitoring unit 31 and the second monitoring unit 32 According to the result, the spray amount of hydrogen chloride is adjusted.
  • the flue 19 has a rectangular cross section, for example, 3 m ⁇ 12 m.
  • hydrogen chloride is supplied from countless (500 or more) nozzles provided in a hydrogen chloride supply pipe extending in the longitudinal direction of the cross section of the flue 19. I try to spray.
  • the operating conditions of the exhaust gas treatment device 10 exhaust gas temperature, exhaust gas flow velocity distribution, hydrogen chloride concentration distribution in the exhaust gas
  • the degree of variation thereof are monitored by the first monitoring unit 31, and those values are monitored by the central processing unit ( CPU), and the required mercury oxidation performance may be ensured by adjusting the amount of hydrogen chloride and the exhaust gas temperature accordingly.
  • FIG. 3 is a graph showing the relationship between the hydrogen chloride concentration and the mercury oxidation rate at the hydrogen chloride charging position (any one of the hydrogen chloride supply regions 41) according to the test example of the present invention. Was not seen.
  • FIG. 4 as shown in the hydrogen chloride charging position according to the comparative example (the flue bend 43 on the upstream side of the hydrogen chloride supply region 41 shown in FIG. 1), the mercury in the exhaust gas. There was variation in the oxidation rate.
  • the mercury oxidation rate 400 sensors were provided as the first monitoring unit 31 on the inlet side of the denitration catalyst layer 13, and the variation of the mercury oxidation rate in the cross section was measured.
  • the predetermined concentration (X) may be 200 to 500 ppm, but the present invention is not limited to this.
  • the supply position for supplying the chlorinating agent is the region 41 where the cross-sectional shape of the upstream-side flue 19 of the denitration catalyst layer is uniform over the axial direction.
  • metal oxides such as V, W, Mo, Ni, Co, Fe, Cr, Mn, and Cu are used as the denitration catalyst used in the denitration catalyst layer 13 for reducing denitration.
  • a sulfate, or a noble metal such as Pt, Ru, Rh, Pd, Ir, or a mixture thereof supported on titania, silica, zirconia and a composite oxide thereof, or zeolite can be used. .
  • the concentration of HCl to be used is not particularly limited.
  • dilute hydrochloric acid of about 5% from concentrated hydrochloric acid can be used.
  • hydrogen chloride (HCl) was used as the chlorinating agent to be used.
  • Hg in the exhaust gas is a denitration catalyst.
  • HgCl and / or HgCl 2 mercury chloride As long as it produces HgCl and / or HgCl 2 mercury chloride.
  • both HCl and NH 3 are added to the exhaust gas 12 discharged from the boiler 11, but NH 3 may not be added to the exhaust gas 12 in the flue 19.
  • the denitration catalyst layer 13 of the exhaust gas treatment device 10 removes NOx (nitrogen oxides) in the exhaust gas 12 and oxidizes Hg in the exhaust gas 12, and Hg is removed by a desulfurization device (not shown) provided on the downstream side. Since it is to be removed, even if NH 3 is not added to the exhaust gas 12 in the flue 19, Hg is converted to chloride with HCl in the presence of the denitration catalyst in the denitration catalyst layer 13, and a desulfurization apparatus (not shown) This is because the effect of removing Hg does not change.
  • the exhaust gas discharged from the boiler of the thermal power plant that burns fossil fuel containing sulfur, mercury, etc. such as coal and heavy oil is described, but the present invention is not limited to this. NOx concentration is low, boiler exhaust gas emitted from a factory that burns fuel containing carbon dioxide, oxygen, SOx, dust, or moisture, fuel containing sulfur, mercury, etc., metal factory, oil refinery factory, petrochemical It can also be applied to furnace exhaust gas discharged from factories and the like.
  • the operating conditions of the actual machine and the degree of variation thereof are monitored, and the spray amount of hydrogen chloride is adjusted accordingly, The required mercury performance can be ensured.
  • the supply position for supplying the chlorinating agent is a section where the cross-sectional shape of the upstream-side flue of the denitration catalyst part is uniform over the axial direction. Since the required mercury performance can be ensured, it is suitable for use in the treatment of exhaust gas discharged from an apparatus that burns fossil fuels such as coal and heavy oil containing mercury such as thermal power plants.

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  • Environmental & Geological Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)

Abstract

L'invention porte sur un appareil pour le traitement de gaz de décharge qui comprend une couche de catalyseur de dénitration (13) dans laquelle des oxydes d'azote (NOx) contenus dans un gaz de décharge (12) déchargé à partir d'une chaudière (11) sont éliminés et du chlorure d'hydrogène en tant qu'agent chlorant est pulvérisé dans le gaz de décharge (12) pour oxyder du mercure (Hg). Dans l'appareil, l'agent de chloration est adressé à cette zone d'un courant de gaz de décharge (19) qui est située en amont de la partie de catalyseur de dénitration et a la même forme en coupe à travers la direction d'axe (n'importe où dans une région d'alimentation en chlorure d'hydrogène (41)). Une performance d'élimination du mercure désirée peut être assurée. Cet appareil peut être utilisé dans le traitement du gaz de décharge évacué à partir d'un appareil qui brûle un combustible fossile contenant du mercure tel que le charbon ou l'huile lourde, comme dans des stations de centrale thermique.
PCT/JP2009/063819 2008-08-20 2009-08-04 Appareil de traitement d'un gaz de décharge et système pour traiter un gaz de décharge Ceased WO2010021237A1 (fr)

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JP2008-212225 2008-08-20
JP2008212225A JP5419400B2 (ja) 2008-08-20 2008-08-20 排ガス処理装置及び排ガス処理システム

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CN108837694B (zh) * 2018-07-02 2021-04-02 宁夏大学 一种从烟气中去除零价汞并固定离子汞的方法

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