WO2010018769A1 - 排ガス処理装置及び排ガス処理システム - Google Patents
排ガス処理装置及び排ガス処理システム Download PDFInfo
- Publication number
- WO2010018769A1 WO2010018769A1 PCT/JP2009/063817 JP2009063817W WO2010018769A1 WO 2010018769 A1 WO2010018769 A1 WO 2010018769A1 JP 2009063817 W JP2009063817 W JP 2009063817W WO 2010018769 A1 WO2010018769 A1 WO 2010018769A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- exhaust gas
- flue
- gas
- flow direction
- gas treatment
- Prior art date
Links
Images
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
- B01D53/64—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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/108—Halogens or halogen compounds
-
- 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
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
-
- 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
- B01D2255/20738—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
- 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
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- 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
- F23J2215/60—Heavy metals; Compounds thereof
Definitions
- the present invention relates to an exhaust gas treatment device and an exhaust gas treatment system for treating 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 gas on an exhaust gas flue have been put to 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 oxides (NOx) in the exhaust gas 12 from the coal-fired boiler 11 that supplies coal as the fuel F, and contains hydrochloric acid (NOx) in the exhaust gas 12.
- NOx nitrogen oxides
- the flue 19 of the exhaust gas upstream 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 chlorinated. It vaporizes in the hydrogen spraying part 21 and is sprayed on the exhaust gas 12 as hydrogen chloride through a hydrogen chloride (HCl) spray nozzle 21a.
- HCl hydrogen chloride
- the flue 19 of the exhaust gas upstream of the denitration catalyst layer 13 is provided with an injection portion of ammonia (NH 3 ), and the ammonia supplied from the NH 3 supply unit 29 is supplied to the exhaust gas 12 by the ammonia spray nozzle 29a.
- NH 3 ammonia
- the ammonia supplied from the NH 3 supply unit 29 is supplied to the exhaust gas 12 by the ammonia spray nozzle 29a.
- NOx nitrogen oxide
- 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 29a is sprayed into the flue gas 12, in the denitration catalyst layer 13, the following As shown in the formula, NOx is replaced with nitrogen (N 2 ) by a reduction reaction, and denitration is performed.
- NOx is replaced with 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 a liquid HCl supply unit 20 to a hydrogen chloride (HCl) spray unit 21 where hydrochloric acid is vaporized and hydrogen chloride ( HCl) is sprayed into the exhaust gas 12 by the hydrogen chloride spray nozzle 21a to oxidize (chlorinate) low-solubility Hg on the denitration catalyst 13 in the denitration catalyst layer 13 as shown in the following formula. It is converted into mercury (HgCl 2 ), and Hg contained in the exhaust gas 12 is removed by a desulfurization device 16 provided on the downstream side. Hg + 2HCl + 1 / 2O 2 ⁇ HgCl 2 + H 2 O (3)
- the fuel when coal or heavy oil is used as the fuel, the fuel contains Cl, so the combustion gas contains a Cl content, but the Cl content differs depending on the type of fuel, and the Cl concentration in the exhaust gas 12 Since it is difficult to control the amount of HCl, it is preferable to add more HCl or the like than necessary to the upstream of the denitration catalyst layer 13 to reliably remove Hg.
- the denitration catalyst layer 13 uses a honeycomb structure having a quadrangular passage arranged in a lattice shape and carrying a denitration catalyst, and the cross-sectional shape of the passage is a polygonal shape such as a triangular shape or a quadrangular shape.
- the passage is made of a shape.
- the flow of the exhaust gas 12 supplied to the conventional denitration catalyst layer 13 is numerous in order to make the concentration of hydrogen chloride uniform in consideration of the variation in the inlet air flow conditions (uneven flow) in the flue. Therefore, there is a problem that the initial cost and the maintenance cost become enormous.
- an object of the present invention is to provide an exhaust gas treatment apparatus and an exhaust gas treatment system capable of efficiently diffusing hydrogen chloride in the flow of exhaust gas supplied into the denitration catalyst layer.
- the first invention of the present invention for solving the above-described problem is to remove at least one denitration catalyst layer that removes nitrogen oxides in exhaust gas from a boiler and oxidizes mercury by spraying hydrogen chloride into the exhaust gas.
- An exhaust gas treatment apparatus having two or more exhaust gas treatment apparatuses, wherein hydrogen chloride is supplied into a flue while generating a gas swirl using gas diffusion promoting means.
- the gas diffusion accelerating means is disposed in the flue, and the spray pipe header inserted perpendicularly to the gas flow direction of the flue;
- An exhaust gas treatment apparatus is provided in a pipe header, wherein a vertical vortex is formed in a gas flow direction from at least three spray nozzles.
- the gas diffusion accelerating means is disposed in the flue, and the spray pipe header inserted perpendicularly to the gas flow direction of the flue;
- An exhaust gas treatment apparatus is characterized in that a plurality of spray nozzles provided in a pipe header are opposed to each other, and a longitudinal vortex is formed in a gas flow direction.
- the gas diffusion accelerating means is disposed in the flue, and the spray pipe header inserted perpendicularly to the gas flow direction of the flue;
- a swirling diffusion plate is provided on the opening side of a spray nozzle provided in a pipe header, and a vertical vortex is formed in the gas flow direction.
- the gas diffusion accelerating means is disposed in the flue, and the spray pipe header inserted perpendicularly to the gas flow direction of the flue;
- a swirl vane is provided on the opening side of a spray nozzle provided in a pipe header, and a vertical vortex is formed in a gas flow direction.
- a sixth invention includes the boiler, a chlorinating agent supply unit for injecting a chlorinating agent into the exhaust gas discharged to the exhaust gas flue downstream of the boiler, and any one of the fifth to fifth exhaust gas treatment apparatuses,
- the exhaust gas treatment system includes a desulfurization device that removes sulfur oxides in the exhaust gas after denitration, and a chimney that discharges the gas after desulfurization to the outside.
- an exhaust gas treatment system according to the sixth aspect of the invention, further comprising an ammonia supply unit for introducing ammonia into the exhaust gas discharged to the exhaust gas flue downstream of the boiler.
- the diffusion of hydrogen chloride is rapidly promoted.
- the concentration uniformity at the catalyst position can be secured.
- FIG. 1-1 is a schematic diagram illustrating a spray nozzle in a flue of the exhaust gas treatment apparatus according to the first embodiment.
- FIG. 1-2 is an AA arrow view of FIG. 1-1.
- FIG. 2-1 is a schematic diagram illustrating a spray nozzle in a flue of the exhaust gas treatment apparatus according to the second embodiment. It is a BB arrow directional view of FIG.
- FIG. 2C is a schematic diagram illustrating a state in which the spray nozzles face each other.
- FIG. 3A is a schematic diagram illustrating a spray nozzle in a flue of the exhaust gas treatment apparatus according to the third embodiment.
- FIG. 3-2 is a CC arrow view of FIG. 3-1.
- FIG. 3-3 is a perspective view of the swirl diffusion plate.
- FIG. 1-1 is a schematic diagram illustrating a spray nozzle in a flue of the exhaust gas treatment apparatus according to the first embodiment.
- FIG. 1-2 is an AA arrow view of FIG. 1-1.
- FIG. 3-4 is a perspective view showing an installed state of another swirl diffusion plate.
- FIG. 4A is a schematic diagram illustrating a spray nozzle in a flue of the exhaust gas treatment apparatus according to the fourth embodiment.
- FIG. 4-2 is a view taken along the line DD in FIG. 4-1.
- FIG. 4-3 is a perspective view of the swirl vane.
- FIG. 4-4 is a side view of the swirl vane.
- FIG. 5 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler.
- FIG. 1-1 is a schematic view showing a spray nozzle in a flue of an exhaust gas treatment apparatus according to an embodiment
- FIG. 1-2 is an AA arrow view thereof.
- the configuration of the exhaust gas treatment system is the same as that shown in FIG. As shown in FIGS.
- the exhaust gas treatment apparatus removes nitrogen oxides in the exhaust gas 12 from the boiler 11 and sprays hydrogen chloride into the exhaust gas 12.
- An exhaust gas treatment apparatus having at least one denitration catalyst layer that oxidizes mercury, and using hydrogen gas diffusion promoting means, hydrogen chloride is supplied into the flue while generating a gas swirl.
- the gas diffusion promoting means is an exhaust gas treatment apparatus according to the present embodiment, in which nitrogen oxides in the exhaust gas 12 from the boiler 11 are used. And an exhaust gas treatment apparatus having at least one denitration catalyst layer for spraying hydrogen chloride into the exhaust gas 12 to oxidize mercury while generating gas swirling flow using gas diffusion promoting means Hydrogen chloride is supplied into the flue.
- the ejection direction of the four nozzles is adjusted to a predetermined angle so that a swirl flow can be generated by the plurality of spray nozzles 52-1 to 52-4.
- a plurality of spray nozzles 52-1 to 52-4 are used as one unit, and the vertical vortex flow 53 is formed by the momentum of the jets from the spray nozzles 52-1 to 52-4. ing.
- the longitudinal vortex is a longitudinal vortex 53 having a rotation axis in the gas flow direction of the exhaust gas 12, and the centrifugal force of the longitudinal vortex expands hydrogen chloride in the radial direction.
- reference numeral 54 indicates the hydrogen chloride diffusion width.
- the diffusion of hydrogen chloride is greatly promoted by this embodiment, the number of nozzles can be reduced as compared with the conventional case, and the concentration uniformity at the catalyst position can be ensured even if the nozzle interval is widened.
- the spray nozzles 52 disposed in the flue 19 may be configured to generate a swirl flow in an appropriate combination, and the vertical vortex flow 53 may be formed from a combination of three or more.
- FIG. 2-1 is a schematic view showing a spray nozzle in the flue of the exhaust gas treatment apparatus according to the embodiment
- FIG. 2-2 is a view taken along line BB.
- FIG. 2-3 is a schematic view showing a state in which the spray nozzles face each other.
- the configuration of the exhaust gas treatment system is the same as that shown in FIG.
- the gas diffusion promoting means is disposed in the flue 19 and the gas flow direction of the flue 19
- the jet pipe header 51 inserted perpendicularly to the spray pipe header 51 and the plurality of spray nozzles 52 provided in the spray pipe header 51 are opposed to each other while the jets collide with each other.
- the spray nozzles 52-1 and 52-2 face each other so that the two jets collide with each other. And the core part of a jet with small gas diffusion is eliminated at an early stage by the collision between jets, and the diffusion is promoted.
- FIG. 3-1 is a schematic view showing a spray nozzle in a flue of the exhaust gas treatment apparatus according to the embodiment
- FIG. 3-2 is a CC arrow view
- FIG. 3-3 is a perspective view of the swirl diffusion plate.
- FIG. The configuration of the exhaust gas treatment system is the same as that shown in FIG.
- the gas diffusion promoting means is disposed in the flue 19 and inserted perpendicular to the gas flow direction of the flue 19.
- the spraying pipe header 51 and the swirling diffusion plate 55 are provided on the opening side of the spray nozzle 52 provided in the spraying pipe header 51 to form a vertical vortex in the gas flow direction.
- a corrugated swirl diffusion plate 55 is added to the opening side of the spray nozzle 52 to generate a vertical vortex 53 on the hydrogen chloride jet axis.
- the shape of the swirling diffusion plate is not limited to the corrugated shape but may be a rectangular staggered swirling diffusion plate 56.
- the jet flow from the spray nozzle 52 is entrained in the vertical vortex generated by the swirl diffusion plate 55. Due to the centrifugal force of the longitudinal vortex, hydrogen chloride is expanded in the radial direction. As a result, in the downstream area, the vertical vortex collapses and diffusion is rapidly promoted.
- the number of spray nozzles 52 can be reduced and the concentration uniformity at the catalyst position can be ensured even if the nozzle interval is widened.
- FIG. 4-1 is a schematic view showing a spray nozzle in a flue of the exhaust gas treatment apparatus according to the embodiment
- FIG. 4-2 is a DD arrow view thereof
- FIG. 4-3 is a perspective view of a swirl blade.
- 4-4 is a side view thereof.
- the configuration of the exhaust gas treatment system is the same as that shown in FIG.
- the gas diffusion promoting means is disposed in the flue 19 and inserted perpendicular to the gas flow direction of the flue 19.
- the spraying pipe header 51 and the swirl vane 57 are provided on the opening side of the spray nozzle 52 provided in the spraying pipe header 51 to form a vertical vortex in the gas flow direction.
- the swirl vane 57 is installed at the spray nozzle outlet, and the exhaust gas 12 flows there, so that the jet of hydrogen chloride is swirled.
- the number of spray nozzles 52 can be reduced and the concentration uniformity at the catalyst position can be ensured even if the nozzle interval is widened.
- a denitration catalyst used in the denitration catalyst layer 13 for reducing denitration metal oxides such as V, W, Mo, Ni, Co, Fe, Cr, Mn, and Cu are used.
- a sulfate, a noble metal such as Pt, Ru, Rh, Pd, or Ir, or a mixture thereof, supported on titania, silica, zirconia and a composite oxide thereof, or zeolite, which are supports 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 ammonium chloride, chlorine, hypochlorous acid, ammonium hypochlorite, chlorous acid, ammonium chlorite, Examples include chloric acid, ammonium chlorate, perchloric acid, ammonium perchlorate, other amine salts of the above acids, and other salts.
- the amount of the chlorinating agent added to the exhaust gas 12 may be a stoichiometric amount or an excessive amount with respect to mercury which is hardly soluble in water.
- the concentration of the chlorinating agent in the exhaust gas flue 19 in the exhaust gas flue 19 is determined with respect to the exhaust gas 12 in consideration of the chlorine concentration in the wastewater discharged on the downstream side while efficiently removing Hg in the exhaust gas 12. Spraying to 1000 ppm or less.
- the addition position of the HCl into the flue gas 12 in the exhaust gas flue 19, while the upstream side of the feed point of the NH 3, may be downstream of the feed point of the NH 3.
- 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 exhaust gas 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 exhaust gas flue 19, Hg is converted to chloride with HCl in the presence of the denitration catalyst of the denitration catalyst layer 13, and a desulfurization apparatus (illustrated This is because the effect of removing Hg does not change.
- the swirl flow may be formed by applying the nozzles according to the first to fourth embodiments even when the ammonia is sprayed.
- the exhaust gas treatment apparatus having the layer 13 since hydrogen chloride is supplied into the flue while generating a gas swirling flow using the gas diffusion promoting means, the diffusion of hydrogen chloride is rapidly promoted. As a result, even when the number of nozzles is reduced and the nozzle interval is widened, the concentration uniformity at the catalyst position can be ensured.
- 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 exhaust gas treatment apparatus uses the gas diffusion accelerating means to supply hydrogen chloride into the flue while generating a gas swirling flow, so that the diffusion of hydrogen chloride is rapidly accelerated. Even if the number of nozzles is reduced and the nozzle interval is widened, the concentration uniformity at the catalyst position can be ensured, so from a device that burns fossil fuels such as coal and heavy oil containing mercury such as thermal power plants. Suitable for use in the treatment of exhaust gas discharged.
- Spray pipe header 52 (52-1 to 52-4) Spray nozzle 53 Longitudinal vortex 54 Hydrogen chloride diffusion width
Abstract
Description
なお、図5中、符号25は酸化還元電位測定制御装置(ORPコントローラ)、26は空気を各々図示する。
4NO + 4NH3 + O2 → 4N2 + 6H2O・・・(1)
NO + NO2 + 2NH3 → 2N2 + 3H2O・・・(2)
Hg + 2HCl + 1/2O2 → HgCl2 + H2O・・・(3)
なお、本実施例に係る排ガス処理装置を適用した排ガス処理システムの構成は、図5に示す排ガス処理システムの構成と同様であるため、本実施例においては、排ガス処理装置の構成のみについて説明する。
図1-1は、実施例に係る排ガス処理装置の煙道内の噴霧ノズルを示す概略図であり、図1-2は、そのA-A矢示図である。なお、排ガス処理システムの構成は図5と同様であるので、その説明は省略する。
図1-1及び図1-2に示すように、本実施例に係る排ガス処理装置は、ボイラ11からの排ガス12中の窒素酸化物を除去すると共に、排ガス12中に塩化水素を噴霧して水銀を酸化する脱硝触媒層を少なくとも一つ以上有する排ガス処理装置であって、ガス拡散促進手段を用いて、ガス旋回流を発生しつつ塩化水素を煙道内に供給してなるものである。
すなわち、本実施例では4ヶのノズルの噴出方向を所定の角度に調整し、複数の噴霧ノズル52-1~52-4で旋回流を発生できるようにしている。
縦渦は、図1-2に示すように、排ガス12のガス流れ方向に回転軸を持つ縦渦流53であり、この縦渦の遠心力により、塩化水素は半径方向に拡げられることとなる。この結果、下流域では、縦渦が崩壊し、拡散が急激に促進されることとなる。図1-2中、符号54は塩化水素拡散幅を図示する。
図2-1は、実施例に係る排ガス処理装置の煙道内の噴霧ノズルを示す概略図であり、図2-2は、そのB-B矢示図である。図2-3は噴霧ノズルの対向状態を示す概略図である。なお、排ガス処理システムの構成は図5と同様であるので、その説明は省略する。
そして、噴流同士の衝突により、ガスの拡散が小さい噴流のコア部分が早期に解消されて、拡散を促進するようにしている。
図3-1は、実施例に係る排ガス処理装置の煙道内の噴霧ノズルを示す概略図であり、図3-2は、そのC-C矢示図、図3-3は旋回拡散板の斜視図である。なお、排ガス処理システムの構成は図5と同様であるので、その説明は省略する。
この縦渦の遠心力により、塩化水素は半径方向に拡げられることとなる。この結果、下流域では、縦渦が崩壊し、拡散が急激に促進されることとなる。
図4-1は、実施例に係る排ガス処理装置の煙道内の噴霧ノズルを示す概略図であり、図4-2は、そのD-D矢示図、図4-3は旋回羽根の斜視図、図4-4はその側面図である。なお、排ガス処理システムの構成は図5と同様であるので、その説明は省略する。
そして、下流域では、縦渦が崩壊し、拡散が急激に促進されることとなる。
このアンモニアの噴霧の際にも実施例1乃至4に係るノズルを適用して旋回流を形成するようにしてもよい。
52(52-1~52-4) 噴霧ノズル
53 縦渦流
54 塩化水素拡散幅
Claims (7)
- ボイラからの排ガス中の窒素酸化物を除去すると共に、排ガス中に塩化水素を噴霧して水銀を酸化する脱硝触媒層を少なくとも一つ以上有する排ガス処理装置であって、
ガス拡散促進手段を用いて、ガス旋回流を発生しつつ塩化水素を煙道内に供給してなることを特徴とする排ガス処理装置。 - 請求項1において、
前記ガス拡散促進手段が煙道内に配設されると共に、該煙道のガス流れ方向と直交して挿入された噴霧用パイプヘッダと、
前記噴霧用パイプヘッダに設けられ、少なくとも3ヶ以上の噴霧ノズルからガス流れ方向に縦渦流を形成してなることを特徴とする排ガス処理装置。 - 請求項1において、
前記ガス拡散促進手段が煙道内に配設されると共に、該煙道のガス流れ方向と直交して挿入された噴霧用パイプヘッダと、
前記噴霧用パイプヘッダに設けられた複数の噴霧ノズルを相対向させつつ、ガス流れ方向に縦渦流を形成してなることを特徴とする排ガス処理装置。 - 請求項1において、
前記ガス拡散促進手段が煙道内に配設されると共に、該煙道のガス流れ方向と直交して挿入された噴霧用パイプヘッダと、
前記噴霧用パイプヘッダに設けられた噴霧ノズルの開口側に旋回拡散板を設け、ガス流れ方向に縦渦流を形成してなることを特徴とする排ガス処理装置。 - 請求項1において、
前記ガス拡散促進手段が煙道内に配設されると共に、該煙道のガス流れ方向と直交して挿入された噴霧用パイプヘッダと、
前記噴霧用パイプヘッダに設けられた噴霧ノズルの開口側に旋回羽根を設け、ガス流れ方向に縦渦流を形成してなることを特徴とする排ガス処理装置。 - 前記ボイラと、
前記ボイラの下流側の排ガス煙道に排出された排ガスに塩素化剤を注入する塩素化剤供給部と、
請求項1乃至5の何れか一つの排ガス処理装置と、
脱硝後の排ガス中の硫黄酸化物を除去する脱硫装置と、
脱硫後のガスを外部に排出する煙突とを有することを特徴とする排ガス処理システム。 - 請求項6において、
前記ボイラの下流側の排ガス煙道に排出された排ガスにアンモニアを投入するアンモニア供給部が設けられてなることを特徴とする排ガス処理システム。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09806662.4A EP2338586B1 (en) | 2008-08-12 | 2009-08-04 | Exhaust gas processing device and exhaust gas processing system |
CN200980129880.XA CN102119051B (zh) | 2008-08-12 | 2009-08-04 | 废气处理装置及废气处理系统 |
CA2733777A CA2733777C (en) | 2008-08-12 | 2009-08-04 | Air pollution control apparatus and air pollution control system |
US13/058,736 US8840843B2 (en) | 2008-08-12 | 2009-08-04 | Air pollution control apparatus and air pollution control system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008208213A JP5489432B2 (ja) | 2008-08-12 | 2008-08-12 | 排ガス処理装置及び排ガス処理システム |
JP2008-208213 | 2008-08-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010018769A1 true WO2010018769A1 (ja) | 2010-02-18 |
Family
ID=41668914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/063817 WO2010018769A1 (ja) | 2008-08-12 | 2009-08-04 | 排ガス処理装置及び排ガス処理システム |
Country Status (6)
Country | Link |
---|---|
US (1) | US8840843B2 (ja) |
EP (1) | EP2338586B1 (ja) |
JP (1) | JP5489432B2 (ja) |
CN (1) | CN102119051B (ja) |
CA (1) | CA2733777C (ja) |
WO (1) | WO2010018769A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10730014B2 (en) | 2015-09-14 | 2020-08-04 | Mitsubishi Hitachi Power Systems, Ltd. | Boiler |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2815962C (en) | 2010-11-02 | 2015-03-31 | Ihi Corporation | Ammonia injection device |
CN104857793A (zh) * | 2015-06-01 | 2015-08-26 | 安徽诚泰环保工程有限公司 | 一种废气净化除尘装置 |
CN108939918B (zh) * | 2017-05-18 | 2021-05-04 | 中国石油化工股份有限公司 | 一种低温scr脱硝处理方法及装置 |
CN108097080A (zh) * | 2017-12-28 | 2018-06-01 | 浙江百能科技有限公司 | 一种节能高效的多种污染物脱除用活性分子双旋流喷射装置 |
CN109619999B (zh) * | 2018-11-30 | 2020-11-27 | 广东美的厨房电器制造有限公司 | 微波烤箱 |
CN112691544B (zh) * | 2019-10-22 | 2022-11-18 | 中国石油化工股份有限公司 | 脱硝用喷氨装置及具有其的裂解炉系统 |
CN110813083B (zh) * | 2019-11-19 | 2021-12-17 | 泉州贝莱邦机械科技有限公司 | 一种室内甲醛空气净化器 |
CN111905538A (zh) * | 2020-07-20 | 2020-11-10 | 来安县华阳玻璃制品有限公司 | 一种耗能少的玻璃加工废气脱硫装置 |
CN114849438B (zh) * | 2022-03-16 | 2024-04-02 | 冀东水泥璧山有限责任公司 | 熟料车间脱硝系统 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5123051U (ja) * | 1974-08-08 | 1976-02-20 | ||
JPS58137425U (ja) * | 1982-03-05 | 1983-09-16 | 三菱重工業株式会社 | アンモニア注入装置 |
JPH0629646U (ja) * | 1992-09-09 | 1994-04-19 | 株式会社いけうち | ノズル |
JPH079428U (ja) * | 1993-07-16 | 1995-02-10 | 三菱重工業株式会社 | 排ガスの脱硝装置 |
JPH09173785A (ja) * | 1995-12-21 | 1997-07-08 | Hitachi Zosen Corp | 脱硝装置におけるアンモニアガス注入装置 |
JPH10230137A (ja) | 1997-02-19 | 1998-09-02 | Mitsubishi Heavy Ind Ltd | 排ガス処理方法及び排ガス処理装置 |
JP2001198434A (ja) | 2000-01-18 | 2001-07-24 | Mitsubishi Heavy Ind Ltd | 排ガス中の水銀処理方法および排ガスの処理システム |
JP2006326498A (ja) * | 2005-05-26 | 2006-12-07 | Masaru Tsukada | 静止混合機 |
JP2008049306A (ja) * | 2006-08-28 | 2008-03-06 | Hitachi Ltd | ガス混合装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6029646U (ja) | 1983-08-03 | 1985-02-28 | シヤチハタ工業株式会社 | 印判 |
GB2149685B (en) * | 1983-11-17 | 1987-08-12 | Dresser Ind | Improvements in or relating to liquid spraying |
YU111888A (en) * | 1987-12-15 | 1990-12-31 | United Technologies Corp | Wrinkled plate with whirl generator |
US5636795A (en) * | 1995-05-11 | 1997-06-10 | First Pioneer Industries Inc. | Cyclonic spray nozzle |
US5988115A (en) * | 1998-08-11 | 1999-11-23 | Anderson; David K. | SCR reactant injection grid |
WO2003008072A1 (fr) * | 2000-01-18 | 2003-01-30 | Mitsubishi Heavy Industries, Ltd. | Procede de traitement du mercure dans un gaz d'echappement et systeme de traitement de gaz d'echappement |
TWI426952B (zh) * | 2006-06-27 | 2014-02-21 | Sulzer Chemtech Ag | 具有在通路流動方向上產生流動漩渦之葉片對的靜態混合器 |
EP1894616A1 (en) * | 2006-08-30 | 2008-03-05 | Fachhochschule Zentralschweiz | Static mixing device |
JP4388542B2 (ja) * | 2006-12-07 | 2009-12-24 | 三菱重工業株式会社 | 水銀除去方法及び水銀除去システム |
-
2008
- 2008-08-12 JP JP2008208213A patent/JP5489432B2/ja not_active Expired - Fee Related
-
2009
- 2009-08-04 WO PCT/JP2009/063817 patent/WO2010018769A1/ja active Application Filing
- 2009-08-04 CN CN200980129880.XA patent/CN102119051B/zh not_active Expired - Fee Related
- 2009-08-04 EP EP09806662.4A patent/EP2338586B1/en not_active Not-in-force
- 2009-08-04 CA CA2733777A patent/CA2733777C/en not_active Expired - Fee Related
- 2009-08-04 US US13/058,736 patent/US8840843B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5123051U (ja) * | 1974-08-08 | 1976-02-20 | ||
JPS58137425U (ja) * | 1982-03-05 | 1983-09-16 | 三菱重工業株式会社 | アンモニア注入装置 |
JPH0629646U (ja) * | 1992-09-09 | 1994-04-19 | 株式会社いけうち | ノズル |
JPH079428U (ja) * | 1993-07-16 | 1995-02-10 | 三菱重工業株式会社 | 排ガスの脱硝装置 |
JPH09173785A (ja) * | 1995-12-21 | 1997-07-08 | Hitachi Zosen Corp | 脱硝装置におけるアンモニアガス注入装置 |
JPH10230137A (ja) | 1997-02-19 | 1998-09-02 | Mitsubishi Heavy Ind Ltd | 排ガス処理方法及び排ガス処理装置 |
JP2001198434A (ja) | 2000-01-18 | 2001-07-24 | Mitsubishi Heavy Ind Ltd | 排ガス中の水銀処理方法および排ガスの処理システム |
JP2006326498A (ja) * | 2005-05-26 | 2006-12-07 | Masaru Tsukada | 静止混合機 |
JP2008049306A (ja) * | 2006-08-28 | 2008-03-06 | Hitachi Ltd | ガス混合装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2338586A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10730014B2 (en) | 2015-09-14 | 2020-08-04 | Mitsubishi Hitachi Power Systems, Ltd. | Boiler |
Also Published As
Publication number | Publication date |
---|---|
CN102119051B (zh) | 2016-03-23 |
EP2338586A4 (en) | 2012-02-01 |
CN102119051A (zh) | 2011-07-06 |
EP2338586B1 (en) | 2014-04-30 |
US20110135541A1 (en) | 2011-06-09 |
CA2733777C (en) | 2013-04-16 |
JP5489432B2 (ja) | 2014-05-14 |
EP2338586A1 (en) | 2011-06-29 |
CA2733777A1 (en) | 2010-02-18 |
US8840843B2 (en) | 2014-09-23 |
JP2010042356A (ja) | 2010-02-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5489432B2 (ja) | 排ガス処理装置及び排ガス処理システム | |
CA2769465C (en) | Air pollution control device | |
CA2769861C (en) | Air pollution control device and method for reducing amount of mercury in flue gas | |
JP4898751B2 (ja) | 排ガス処理装置及び排ガス処理システム | |
JP2012011316A (ja) | 排ガス処理装置 | |
TW201118316A (en) | System and method for protection of SCR catalyst | |
JP4959650B2 (ja) | 排ガス処理装置及び排ガス処理システム | |
JP5398193B2 (ja) | 排ガス処理装置、排ガス処理システム及び排ガス中の水銀酸化性能管理システム | |
JP5716186B2 (ja) | 排ガス処理装置及び排ガス処理システム | |
JP5419400B2 (ja) | 排ガス処理装置及び排ガス処理システム | |
JP5945093B2 (ja) | 水銀除去装置 | |
KR200234632Y1 (ko) | 산화촉매를 이용한 질소산화물 제거장치 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980129880.X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09806662 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 913/CHENP/2011 Country of ref document: IN |
|
ENP | Entry into the national phase |
Ref document number: 2733777 Country of ref document: CA |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13058736 Country of ref document: US Ref document number: 2009806662 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |