WO2010016393A1 - 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
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- WO2010016393A1 WO2010016393A1 PCT/JP2009/063195 JP2009063195W WO2010016393A1 WO 2010016393 A1 WO2010016393 A1 WO 2010016393A1 JP 2009063195 W JP2009063195 W JP 2009063195W WO 2010016393 A1 WO2010016393 A1 WO 2010016393A1
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- exhaust gas
- denitration catalyst
- catalyst layer
- gas treatment
- flow generating
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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
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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
- B01D53/74—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
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- 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
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
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- 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
- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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 equipment in the flue, and mercury is oxidized (chlorinated) on the denitration catalyst to be water-soluble.
- a method of absorbing with a downstream wet desulfurization apparatus has been proposed (see, for example, Patent Document 1 and Patent Document 2).
- devices and techniques for gas spraying into the flue have been put to practical use in NH 3 spraying of denitration devices and gas spraying of chlorinating agents.
- Fig. 8 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 fuel, and hydrochloric acid (HCl) in the exhaust gas 12.
- NOx nitrogen oxides
- HCl hydrochloric acid
- an air preheater 14 for recovering heat in the exhaust gas 12 after removal of nitrogen oxides (NOx), and dust in the exhaust gas 12 after heat recovery
- a chimney 18 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 hydrochloric acid (liquid) stored in the hydrochloric acid (liquid HCl) supply unit 20 is hydrogen chloride (liquid chloride).
- HCl) spraying portion 21 is vaporized and sprayed to exhaust gas 12 as hydrogen chloride through a hydrogen chloride (HCl) spray nozzle 22.
- an ammonia (NH 3 ) injection point is provided in the flue 19 upstream of the denitration catalyst layer 13, and ammonia (NH 3 ) supplied from the ammonia (NH 3 ) supply unit 23 is ammonia (NH 3 ).
- the exhaust gas 12 is sprayed by the NH 3 ) spray nozzle 24 to reduce NOx.
- reference numeral 25 denotes an oxidation-reduction potential measurement control device (ORP controller), and 26 denotes air.
- the exhaust gas 12 from the boiler 11 is supplied to the denitration catalyst layer 13, and then the air 27 is heated by heat exchange in the air preheater 14, then supplied to the electric dust collector 15, and further supplied to the desulfurization device 16. After that, the purified gas 17 is discharged to the atmosphere.
- 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, and NH 3 supplied from the NH 3 supply unit 23 through the NH 3 spray nozzle 24 and sprayed into the flue gas 12, in the denitration catalyst layer 13, the following formula
- NOx is replaced by nitrogen (N 2 ) by a reduction reaction, and denitration is performed.
- hydrogen chloride is used for mercury oxidation
- hydrogen chloride used as a chlorinating agent is supplied from the liquid HCl supply unit 20 to the HCl spray unit 21, where hydrochloric acid is vaporized and is converted to HCl by the HCl spray nozzle 22.
- Hg having low solubility is oxidized (chlorinated) on the denitration catalyst as shown in the following formula, and converted to mercury chloride (HgCl 2 ) having high water solubility.
- Hg contained in the exhaust gas 12 is removed by a 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 differs depending on the type of fuel, and the concentration of Cl in the exhaust gas varies. Since it is difficult to control, it is preferable to add more than a necessary amount of HCl or the like to the upstream of the exhaust gas treatment apparatus 10 to reliably remove Hg.
- the denitration catalyst layer 13 uses 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
- the passage has a polygonal shape such as a triangular shape or a rectangular shape.
- the airflow of the exhaust gas 12 supplied to the conventional denitration catalyst layer 13 is rectified by a rectification means (not shown) before the denitration catalyst layer 13 and is in a laminar flow state. 13, the contact area with the denitration catalyst is limited. As a result, there is a problem that it is difficult to further improve the oxidation reaction efficiency of mercury. .
- the present invention provides an exhaust gas treatment device and an exhaust gas treatment system in which the contact area between the exhaust gas supplied into the denitration device and the denitration catalyst is increased, and the oxidation efficiency of mercury in the exhaust gas is further improved.
- the task is to do.
- a first invention of the present invention for solving the above-mentioned problems is a denitration catalyst layer that removes nitrogen oxides in exhaust gas from a boiler and oxidizes mercury by spraying hydrogen chloride into the flue of the exhaust gas.
- a swirl flow generating member provided on the inlet side of the denitration catalyst layer to change the laminar exhaust gas in the flue into a swirl flow inside the denitration catalyst layer.
- the exhaust gas treatment apparatus is characterized by the following.
- the denitration catalyst layer is a honeycomb catalyst
- the swirl flow generating member body is formed by dividing the swirl flow generating member corresponding to each passage on the inlet side of the honeycomb catalyst. And a plurality of swirl flow generating blades that are arranged on the partitioned inner wall and generate turbulent flow.
- a third invention is characterized in that, in the second invention, the plurality of swirl flow generating blades provided on the inner wall are set as a set, and a plurality of them are arranged in the gas flow direction while being offset. It is in the exhaust gas treatment device.
- the denitration catalyst layer is provided in a plurality of stages along the flow direction of the exhaust gas, and the swirl flow generating member is provided in each stage.
- the exhaust gas treatment apparatus is characterized by being disposed.
- the boiler a chlorinating agent supply unit for injecting a chlorinating agent into the exhaust gas discharged to the flue downstream of the boiler, and the exhaust gas treatment according to any one of the first to fourth aspects of the invention
- the exhaust gas treatment system includes an apparatus, a desulfurization apparatus 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 fifth aspect of the invention, wherein an ammonia supply unit is provided for injecting ammonia into the exhaust gas discharged to the flue downstream of the boiler.
- the swirl flow generating member is provided on the inlet side of the denitration catalyst layer that removes nitrogen oxides in the exhaust gas from the boiler, and the laminar exhaust gas in the flue is changed to a swirl flow inside the denitration catalyst layer. Therefore, the contact time of the exhaust gas with the denitration catalyst can be increased. For this reason, by supplying HCl in the exhaust gas in advance, the oxidation reaction efficiency between mercury in the exhaust gas and the denitration catalyst can be improved. Thereby, mercury in the exhaust gas can be removed with high efficiency by a desulfurization device provided on the downstream side of the exhaust gas treatment device.
- the amount of the denitration catalyst used in the denitration catalyst layer can be reduced, and the supply of the chlorinating agent to be supplied to the exhaust gas The amount can be reduced.
- 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 of the swirl flow generating member.
- FIG. 3 is a view of the swirling flow generating member when viewed from the axial direction.
- FIG. 4 is a view of another swirling flow generating member when viewed from the axial direction.
- FIG. 5 is a schematic diagram showing an exhaust gas treatment system having another configuration of the exhaust gas treatment device according to the embodiment of the present invention.
- FIG. 6 is a view when another swirl flow generating member is viewed from the axial direction.
- FIG. 7 is a perspective view of the honeycomb catalyst.
- FIG. 8 is a schematic diagram of an exhaust gas treatment system for a coal fired boiler.
- FIG. 1 is a schematic view showing an exhaust gas treatment apparatus according to an embodiment
- FIG. 2 is a perspective view of a swirl flow generating member
- FIG. 3 is a view of the swirl flow generating member when viewed from the axial direction. is there. 1 is a part of the exhaust gas treatment system shown in FIG. 8, the same members as those in the conventional configuration are denoted by the same reference numerals, and redundant description is omitted.
- the exhaust gas treatment apparatus 10 removes nitrogen oxides in the exhaust gas 12 from the boiler 11 and sprays hydrogen chloride into the flue 19 of the exhaust gas 12 to mercury.
- the exhaust gas treatment apparatus has at least one denitration catalyst layer 13 that oxidizes the exhaust gas, and a swirl flow generating member 30A is provided on the inlet side of the denitration catalyst layer 13 to remove the laminar exhaust gas 12 in the flue 19 from the denitration catalyst.
- the layer 13 is changed to a swirl flow.
- the swirling flow generating member 30A is arranged on the swirling flow generating section main body 31 that is partitioned corresponding to each passage on the inlet side of the honeycomb catalyst and the partitioned inner wall 32. And a plurality of swirl flow generating blades 33A that generate turbulent flow.
- the swirl flow generating blade 33A is a triangular plate-shaped member in the present embodiment, and is arranged to be inclined in the same direction along one side of the swirl flow generating blade 33A along the inner wall 32.
- each passage is provided with a swirl flow generating blade 33A, which is omitted in the figure.
- the number of swirl flow generating blades 33A is four corresponding to the inner wall 32, but the present invention is not limited to this, and may be two or three, or five. You may make it provide above. Further, the number of the swirl flow generating blades 33A is appropriately changed according to the shape of the passage of the honeycomb catalyst.
- a swirl flow generator main body 31 that is partitioned on the inlet 13a side of the denitration catalyst layer 13 corresponding to each passage on the inlet 13a side of the denitration catalyst layer 13 and an inner wall 32 that is partitioned. Since the swirl flow generating member 30A is provided and is configured by a plurality of swirl flow generating blades 33A that generate turbulent flow, the laminar exhaust gas 12 in the flue 19 is swirled inside the denitration catalyst layer 13. The contact time of the exhaust gas 12 with the denitration catalyst can be increased. Therefore, since HCl is supplied to the exhaust gas 12 in advance, the oxidation reaction efficiency between Hg in the exhaust gas 12 and the denitration catalyst can be improved.
- Hg in the exhaust gas 12 can be removed with high efficiency by a desulfurization device (not shown) provided on the downstream side of the exhaust gas treatment device 10.
- the amount of denitration catalyst used in the denitration catalyst layer 13 can be reduced, and the amount of HCl supplied to the exhaust gas 12 is reduced. be able to.
- the size of the cross section of the honeycomb catalyst passage 28 of the denitration catalyst layer 13 improves the contact efficiency between the exhaust gas 12 and the denitration catalyst, and lowers the pressure loss of the exhaust gas 12. From the viewpoint of making it, it is usually narrowed to 5 mm square.
- the denitration catalyst layer is provided in order to reduce the pressure loss of the exhaust gas 12 while improving the contact efficiency between the exhaust gas 12 and the denitration catalyst by providing the swirl flow generating member 30A corresponding to the honeycomb passage.
- the length of one side of each of the thirteen passages 28 can be increased by 5 mm or more.
- the opening can be 6 to 10 mm square.
- angle of inclination inclined along the inner wall 32 of the swirl flow generating blade 33A may be an angle that can make the exhaust gas 12 turbulent according to the flow rate of the exhaust gas 12 and the like.
- a set of four swirl flow generating blades 33A arranged inside may be provided, and a plurality of sets of the swirl flow generating blades 33A may be provided along the gas flow at a predetermined interval.
- a part of the set of swirl flow generating blades 33A-2 provided on the downstream side in the gas flow direction is a set of provided on the upstream side of the exhaust gas 12.
- a plurality of them may be provided with an offset so as not to overlap with the swirl flow generating blade 33A-1. Thereby, a swirl flow can be generated in the exhaust gas 12 more efficiently.
- the pair of swirl flow generating blades 33A-2 provided on the downstream side of the exhaust gas 12 when viewed from the axial direction of the swirl flow generating unit main body 31 is a set provided on the upstream side of the exhaust gas 12.
- a plurality of swirling flow generating blades 33A-1 may be provided on the inner wall 32 of the swirling flow generating unit main body 31 so as to overlap with each other.
- the present invention is not limited to this, and as shown in FIG. A plurality (three in the present embodiment) of the denitration catalyst layers 13-1 to 13-3 may be disposed in 19 along the flow direction of the exhaust gas 12. At this time, swirl flow generating members 30A-1 to 30A-3 may be provided on the inlet sides of the denitration catalyst layers 13-1 to 13-3 so that the swirl flow is generated more efficiently in the exhaust gas 12. .
- the cross-sectional shape of the swirl flow generating blade 33A of the swirl flow generating member 30A is triangular, but the present invention is not limited to this, and as shown in FIG.
- a swirl flow generating member 30B may be used which is a swirl flow generating blade 33B and is arranged so that one side thereof is inclined in the same direction along the inner wall 32.
- metal oxides such as V, W, Mo, Ni, Co, Fe, Cr, Mn, and Cu are used as denitration catalysts used in the denitration catalyst layer 13 for reduction denitration.
- 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.
- ammonium chloride, chlorine, hypochlorous acid, ammonium hypochlorite, chlorous acid, ammonium chlorite, chloric acid examples include 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 Hg which is hardly soluble in water. While efficiently removing Hg in the exhaust gas 12 and considering the chlorine concentration in the waste water discharged on the downstream side, the concentration of the chlorinating agent of the exhaust gas 12 in the flue 19 is What is necessary is just to make it spray so that it may become 1000 ppm or less.
- the addition position of the HCl into the flue gas 12 in the 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 flue 19.
- NOx in the exhaust gas 12 is removed, Hg in the exhaust gas 12 is oxidized, and Hg is removed by a desulfurization device (not shown) provided on the downstream side. Therefore, 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 Hg is removed by a desulfurization apparatus (not shown). This is because it can be done.
- the NOx in the exhaust gas 12 from the boiler 11 is removed, and the denitration catalyst layer 13 that oxidizes Hg by spraying HCl into the exhaust gas 12 is provided.
- An exhaust gas treatment apparatus wherein a swirl flow generator main body 31 is defined on the inlet 13a side of the denitration catalyst layer 13 in correspondence with each passage 28 on the inlet 13a side of the denitration catalyst layer 13, and the partitioned inner wall
- a swirling flow generating member 30A is provided, which is configured by a plurality of swirling flow generating blades 33A that are disposed in the position 32 and generate turbulent flow.
- the laminar exhaust gas 12 in the flue 19 is changed to a swirl flow inside the denitration catalyst layer 13, and the contact time of the exhaust gas 12 with the denitration catalyst can be increased. Therefore, since HCl is supplied to the exhaust gas 12 in advance, the oxidation reaction efficiency between Hg in the exhaust gas 12 and the denitration catalyst can be improved. As a result, in the exhaust gas treatment system to which the exhaust gas treatment device 10 according to the present embodiment is applied, Hg can be removed with high efficiency by a desulfurization device (not shown) provided on the downstream side of the exhaust gas treatment device 10.
- the amount of denitration catalyst used in the denitration catalyst layer 13 can be reduced, and the amount of HCl supplied to the exhaust gas 12 is reduced. be able to.
- the exhaust gas treatment apparatus includes a swirl flow generating member on the inlet side of the denitration catalyst layer, and changes the laminar exhaust gas in the flue into a swirl flow inside the denitration catalyst layer. Since the contact time of the exhaust gas with the denitration catalyst is increased and the oxidation reaction efficiency between mercury and the denitration catalyst is improved, the exhaust gas is discharged from an apparatus for burning fossil fuel such as coal or heavy oil containing Hg such as a thermal power plant. It is suitable for use in the treatment of exhaust gas.
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Abstract
Description
なお、図8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)
このため、前記排ガス中に予めHClを供給しておくことで、前記排ガス中の水銀と脱硝触媒との酸化反応効率を向上させることができる。これにより、排ガス処理装置の後流側に設けられる脱硫装置により前記排ガス中の水銀を高効率で除去することができる。
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8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は、実施例に係る排ガス処理装を示す概略図であり、図2は、旋回流発生部材の斜視図であり、図3は、旋回流発生部材を軸方向から見たときの図である。
なお、図1の構成は、図8に示す排ガス処理システムの一部であるので、従来の構成と同一部材には同一符号を付して重複した説明は省略する。
ここで、この旋回流発生翼33Aは本実施例では三角形状の板状部材であり、旋回流発生翼33Aの一辺を内壁32に沿うように同一方向に傾斜して配置されている。
なお、図中、各通路には旋回流発生翼33Aを各々設けているが、図中は省略する。
11 ボイラ
12 排ガス
13 脱硝触媒層
13a 入口
19 煙道
20 塩酸(液体HCl)供給部
21 塩化水素(HCl)噴霧部
22 塩化水素(HCl)噴霧ノズル
23 アンモニア(NH3)供給部
24 アンモニア(NH3)噴霧ノズル
28 通路
30A、30A-1~30A-3、30B 旋回流発生部材
31 旋回流発生部本体
32 内壁
33A、33B 旋回流発生翼
Claims (6)
- ボイラからの排ガス中の窒素酸化物を除去すると共に、前記排ガスの煙道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、
前記脱硝触媒層の入口側に、旋回流発生部材を設け、煙道中の層流の排ガスを脱硝触媒層内部で旋回流に変化させ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、
脱硝触媒層がハニカム触媒であり、
前記旋回流発生部材が、前記ハニカム触媒の入口側の各通路に対応して区画されてなる旋回流発生部本体と、該区画された内壁に配設され、乱流を発生させる複数の旋回流発生翼とからなることを特徴とする排ガス処理装置。 - 請求項2において、
前記内壁に設けられた複数の前記旋回流発生翼を一組とし、それらがオフセットしつつガス流れ方向に複数配設されていることを特徴とする排ガス処理装置。 - 請求項1乃至3の何れか一つにおいて、
前記脱硝触媒層が前記排ガスの流れ方向に沿って複数段設けられていると共に、
前記旋回流発生部材が、各々の段に配置され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4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5において、
前記ボイラの下流側の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。
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CA2729664A CA2729664C (en) | 2008-08-07 | 2009-07-23 | Air pollution control apparatus and air pollution control system |
EP09804880A EP2311550A4 (en) | 2008-08-07 | 2009-07-23 | DEVICE AND SYSTEM FOR TREATING EXHAUST GASES |
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CN111111414A (zh) * | 2020-01-14 | 2020-05-08 | 山东师范大学 | 一种利用双氧水和旋流盘塔进行烟气脱硝的脱硝系统 |
CN111420557A (zh) * | 2020-05-13 | 2020-07-17 | 福建龙净脱硫脱硝工程有限公司 | 多单元脱硝设备 |
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CN102519052B (zh) * | 2011-12-28 | 2014-07-23 | 一重集团大连设计研究院有限公司 | 烟气多段混流节能降温装置 |
CN103933858B (zh) * | 2014-02-28 | 2016-08-17 | 东南大学 | 一种切向式双涡流scr混合器 |
CN104534495B (zh) * | 2014-12-30 | 2017-06-16 | 黑龙江国德节能服务有限公司 | 雾化压缩烟气脱氮热能回收装置及脱氮和热能回收方法 |
CN108404653A (zh) * | 2018-03-30 | 2018-08-17 | 西安热工研究院有限公司 | 一种烟气scr脱硝提效系统和方法 |
CN116688739A (zh) * | 2023-06-29 | 2023-09-05 | 中耐控股集团有限公司 | 一种采用外排烟气的低温脱硝常减压炉及使用方法 |
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DE19830342C1 (de) * | 1998-07-07 | 1999-11-25 | Siemens Ag | Katalysatorkörper |
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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 |
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CN111420557A (zh) * | 2020-05-13 | 2020-07-17 | 福建龙净脱硫脱硝工程有限公司 | 多单元脱硝设备 |
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EP2311550A1 (en) | 2011-04-20 |
EP2311550A4 (en) | 2012-08-29 |
CA2729664C (en) | 2013-09-17 |
JP4898751B2 (ja) | 2012-03-21 |
CA2729664A1 (en) | 2010-02-11 |
CN102099097A (zh) | 2011-06-15 |
JP2010036159A (ja) | 2010-02-18 |
US8518332B2 (en) | 2013-08-27 |
US20110116981A1 (en) | 2011-05-19 |
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