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WO2023048398A1 - Système de post-traitement de gaz d'échappement pour moteur diesel comprenant un filtre revêtu d'un catalyseur de dénitrification - Google Patents

Système de post-traitement de gaz d'échappement pour moteur diesel comprenant un filtre revêtu d'un catalyseur de dénitrification Download PDF

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Publication number
WO2023048398A1
WO2023048398A1 PCT/KR2022/011768 KR2022011768W WO2023048398A1 WO 2023048398 A1 WO2023048398 A1 WO 2023048398A1 KR 2022011768 W KR2022011768 W KR 2022011768W WO 2023048398 A1 WO2023048398 A1 WO 2023048398A1
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WIPO (PCT)
Prior art keywords
exhaust gas
urea
catalyst
coated
filter
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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
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PCT/KR2022/011768
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English (en)
Korean (ko)
Inventor
이강흥
남승하
신병선
서필원
오형석
김종국
정관형
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CERACOMB Co Ltd
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CERACOMB Co Ltd
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Publication of WO2023048398A1 publication Critical patent/WO2023048398A1/fr
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Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust gas post-treatment system for a diesel engine including a filter coated with a NOx removal catalyst, and more particularly, to a filter including a NOx removal catalyst coated filter for purifying exhaust gas discharged from a diesel engine of a mid- to large-sized vehicle. It relates to an exhaust gas aftertreatment system.
  • Diesel engines emit harmful exhaust gas substances such as carbon monoxide (CO), unburned hydrocarbons (HC), particulate matter (PM), and nitrogen oxides ( NOx ) by combustion reactions.
  • CO carbon monoxide
  • HC unburned hydrocarbons
  • PM particulate matter
  • NOx nitrogen oxides
  • diesel that oxidizes hydrocarbon (HC) or carbon monoxide (CO) contained in exhaust gas or oxidizes soluble organic fraction (SOF) contained in particulate matter.
  • DOC Diesel Oxidation Catalyst
  • DPF Diesel Particulate Matter Filter
  • SCR Selective Catalyst
  • NO x nitrogen oxides
  • AOC ammonia slip catalyst
  • the particle collecting device coated with such a selective reduction catalyst is applied with a small engine of 3,000cc or less along with a new engine technology when a new vehicle is manufactured. None) is a state.
  • the selective reduction catalyst capable of reducing nitrogen oxides is adjacent to the engine, and the selective reduction catalyst adjacent to the engine reacts with engine heat generated from the engine. Since the temperature is reached quickly, there is an advantage in that the nitrogen oxide reduction rate is increased.
  • the volume of the catalyst device can be reduced, and accordingly, the cost of the exhaust gas after-treatment system is reduced. has the advantage of reducing
  • the generation of a large amount of particulate matter (PM) and the difference in exhaust gas characteristics such as the ratio of emitted particulate matter to nitrogen oxides (PM/ NOX ratio) cause back pressure.
  • PM/ NOX ratio the ratio of emitted particulate matter to nitrogen oxides
  • An object of the present invention is to provide an exhaust gas aftertreatment system for a diesel engine including a filter coated with a denitration catalyst capable of minimizing back pressure increase and total nitrogen oxide emission.
  • the present invention is installed in the exhaust pipe of the internal combustion engine, oxidizes hydrocarbon (HC) or carbon monoxide (CO) contained in exhaust gas, or soluble organic component (SOF; Soluble Organic Fraction) contained in particulate matter. ) in an exhaust gas post-treatment system including a Diesel Oxidation Catalyst (DOC) that oxidizes nitrogen oxides in a Diesel Particulate Matter Filter (DPF) that collects particulate matter and purifies exhaust gas.
  • DOC Diesel Oxidation Catalyst
  • DPF Diesel Particulate Matter Filter
  • SDPF SCR on DPF; Selective Catalyst Reduction-on-Diesel Particulate Filter coated with a denitrification catalyst for purifying (NO x ), but the denitrification catalyst has a particle size of 2 to 4 ⁇ m, pH 5 to 7, and Provided is an exhaust gas post-treatment system including a filter coated with a denitration catalyst, characterized in that the particle collecting device is coated in a slurry state with a viscosity of 150 to 300 cp.
  • the particle collecting device may be a symmetrical filter made of cordierite or silicon carbide, in which cells on an upstream side through which the exhaust gas flows in and on a downstream side through which the exhaust gas flows out have the same size. there is.
  • the particulate collecting device is an asymmetrical filter made of cordierite or silicon carbide, and the cells of the upstream side through which the exhaust gas flows in and the downstream side through which the exhaust gas flows out have different sizes.
  • a selective catalytic reduction device for purifying nitrogen oxides (NO x ) may be further included.
  • an ammonia oxidation catalyst may be further included located at the rear end of the SDPF to oxidize and purify ammonia discharged from the SDPF.
  • a urea mixer located between the diesel oxidation catalyst device and the SDPF and mixing the urea aqueous solution and the exhaust gas is further included, wherein the urea mixer includes a ring-shaped body and an inner circumferential surface of the body. It includes a plurality of blades provided to be spaced apart from each other along, but the blades may include an extension piece extending inward from the inner circumferential surface of the body, and a wing piece bent clockwise or counterclockwise at the distal end of the extension piece. there is.
  • a burner for heating and raising the temperature of the exhaust gas, and a urea injector located in front of the SDPF and injecting urea may be further included.
  • a urea introduction part located in front of the diesel oxidation catalyst device, into which an aqueous urea solution is introduced, and urea provided through the diesel oxidation catalyst device, through which the aqueous urea solution introduced through the urea introduction part passes. It further includes a flow pipe, but the urea mixer may be provided at a downstream end of the urea flow pipe.
  • the urea inlet may be introduced together with high-pressure air so that the urea aqueous solution can pass through the urea flow conduit.
  • the exhaust gas aftertreatment system including the filter coated with the NOx removal catalyst according to the present invention can minimize the increase in back pressure and the total amount of nitrogen oxides emitted by the exhaust gas aftertreatment system by using the particulate collector coated with the NOx removal catalyst.
  • FIG. 1 is a block diagram of an exhaust gas post-treatment system according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing the appearance of an SDPF according to an embodiment of the present invention.
  • FIG. 3A is a block diagram of an exhaust gas post-treatment system according to another embodiment of the present invention.
  • 3B is a configuration diagram of an exhaust gas post-treatment system according to another embodiment of the present invention.
  • FIG. 4 is a view showing the appearance of an exhaust gas post-treatment system according to another embodiment of the present invention.
  • FIG. 5 is a schematic view of exhaust gas flowing in the exhaust gas post-treatment system of FIG. 4 .
  • FIG. 6 is a view showing a urea mixer according to an embodiment of the present invention and a urea mixer according to a comparative example.
  • FIG. 7 is a view showing the urea mixer according to an embodiment of the present invention viewed from various angles.
  • FIG. 8 is a view showing one blade of the urea mixer of FIG.
  • FIG. 1 is a block diagram of an exhaust gas post-treatment system according to an embodiment of the present invention.
  • the exhaust gas post-treatment system for a diesel engine is mounted on an exhaust pipe of an internal combustion engine, and hydrocarbons (HC) included in exhaust gas generated from the engine 1
  • a Diesel Oxidation Catalyst (DOC) 21 that oxidizes carbon monoxide (CO) or oxidizes soluble organic fraction (SOF) contained in particulate matter, and exhaust gas by collecting particulate matter SDPF (SCR on DPF; Selective Catalyst Reduction - on - Diesel Particulate Filter) (41) coated with a denitrification catalyst for purifying nitrogen oxides (NO x ) is applied to a diesel particulate matter filter (DPF) that purifies can include
  • hydrocarbons (HC) or carbon monoxide (CO) contained in the exhaust gas are oxidized or particulate matter (PM)
  • a Diesel Oxidation Catalyst (DOC) 21 may be included to oxidize the soluble organic fraction (SOF) included in the.
  • the diesel oxidation catalyst device 21 is a catalyst coated with precious metals such as platinum (Pt), palladium (Pd), rhodium (Rh), etc.
  • Oxygen (O 2 ) in the gas is used to oxidize hydrocarbons (HC) or carbon monoxide (CO) contained in the exhaust gas or oxidize soluble organic fraction (SOF) contained in particulate matter to water (H 2 O) and carbon dioxide (CO 2 ).
  • the diesel oxidation catalyst device 21 oxidizes nitrogen monoxide (NO) to produce nitrogen dioxide (NO 2 ), and the oxidized nitrogen dioxide (NO 2 ) causes an oxidation reaction with carbon collected in the particle collector. do.
  • a chemical reaction occurring in the diesel oxidation catalyst device 21 is shown in Formula 1 below.
  • the exhaust gas aftertreatment system can collect most of the particulate matter included in the exhaust gas discharged from the engine 1 and purify the exhaust gas discharged to the outside through the exhaust pipe. there is.
  • the particle collection device may be located at the rear end of the diesel oxidation catalyst device 21, and may be specifically provided in the second container 40 connected to the first container 20 to be in communication. .
  • the DPF is a porous ceramic honeycomb structure for collecting particulate matter contained in exhaust gas, or a filter plugged by alternately inlet and outlet of a porous ceramic honeycomb cell as another example, that is, Wall Flow It can be Monoliths Type.
  • Exhaust gas flows into the inlet of the unplugged cell, passes through the cell wall for collecting particulate matter (PM) formed at the boundary with the adjacent unplugged cell, and flows out through the outlet of the unplugged cell,
  • the cell wall collects particulate matter (PM), and soot particles of the particulate matter are collected in the form of a cake on the wall surface.
  • the DPF regenerates (oxidizes) the soot by converting it into carbon dioxide and water through an oxidation reaction with the soot (carbon) collected in the filter.
  • the DPF physically collects particulate matter from the exhaust gas of the engine 1 using a filter, but there is a limit to the collection amount that can be collected. It is possible to restore the ability to capture particulate matter through forced regeneration in which the collected particulate matter is burned and removed by passing through the particulate matter.
  • a burner 23 is positioned upstream of the DPF to heat and raise the exhaust gas flowing into the DPF.
  • the burner 23 is provided in the first container 20, and the flame or heat generated by the burner 23 can increase the temperature of the exhaust gas introduced from the engine 1.
  • the burner 23 for heating the exhaust gas may use fuel such as diesel as well as electricity or microwaves, but the type is not particularly limited.
  • the DPF according to an embodiment of the present invention described above is preferably an SDPF 41 coated with a NOx removal catalyst.
  • the DPF is a filter having a honeycomb cell structure made of porous silicon carbide (SiC) or cordierite with a porosity of 48 to 55% and a pore size of 12 to 20 ⁇ m ( 2), and the denitration catalyst coated therein uses a V 2 O 5 -WO 3 /TiO 2 based denitration catalyst to ensure high sulfur resistance and denitration performance, and the composition is V 2 O 5 1 to 10 wt %, WO 3 1 ⁇ 15 wt%, SiO 2 1 ⁇ 10 wt%, TiO 2 It may be composed of a composition of 65 ⁇ 97 wt%.
  • one or more transition metal oxides such as Mo, Ce, Fe, and Cu may be used as a cocatalyst, and may be included in an amount of 0.5 to 5% in the above composition.
  • a zeolite-based denitrification catalyst may be used as the denitrification catalyst coated on the DPF, and one of Cu and Fe may be used as the transition metal ion-exchanged with the zeolite,
  • the content of the ion-exchanged transition metal may be 1 to 5% of the total content of the zeolite.
  • the denitration catalyst according to an embodiment of the present invention is preferably coated on a particle collecting device in a slurry state having a particle size of 2 to 4 ⁇ m, a pH of 5 to 7, and a viscosity of 150 to 300 cp (hereinafter Example 1 abbreviated).
  • the particle collecting device coated with the denitrification catalyst according to Example 1 of the present invention was compared to the particle collecting device not coated with the denitrification catalyst (Comparative Example 1), and other physical properties (particle size 4-8 ⁇ m, pH 3-5, In addition, the results of testing the back pressure in comparison with the particle collecting device (Comparative Example 2) coated with the slurry having a viscosity of 500 to 800 cp) are shown in Table 1 below.
  • a honeycomb structured filter made of cordierite with a porosity of 48 to 50% and a pore size of 12 to 15 ⁇ m was used as the particle collecting device.
  • the denitrification catalyst according to Example 1 of the present invention was adjusted to a particle size of 2 to 4 ⁇ m and pH to 5 to 7 during manufacture, but the pH was adjusted using nitric acid, acetic acid or ammonia water.
  • the viscosity of the denitrification catalyst in a slurry state before coating on the particle collecting device was adjusted to 150 to 300 cp.
  • the back pressure of the particle collecting device coated with the denitration catalyst according to Example 1 of the present invention was 13.8 CFM, which was 2.3 CFM higher than the back pressure of 11.5 CFM of the particle collecting device not coated with the denitration catalyst, but Comparative Example 2 It was confirmed that the back pressure was 3 CFM lower than that of the particulate collector coated with the denitrification catalyst having a particle size of 4 to 8 ⁇ m, a pH of 3 to 5, and a viscosity of 500 to 800 cp.
  • Example 1 of the present invention a mid- to large-sized post-processing device to which the particle collecting device coated with the NOx removal catalyst according to Example 1 of the present invention was applied was fabricated, installed in an actual engine, and a dynamometer performance test was conducted.
  • the test engine the D6DB engine, which is widely applied to current vehicles, was used, and the ND-13 Mode test was performed by installing it on the 6600cc D6DB engine.
  • Example 1 As a result of the experiment, when the particle collecting device coated with the denitrification catalyst having the properties of Comparative Example 2 was applied, the maximum output back pressure was 280.3 mbar and the total NOx emission was 1.287g/kwh, and the physical properties of Example 1 of the present invention
  • the experimental results were measured as a maximum output back pressure of 269 mbar and a total NOx emission of 0.45 g/kwh, so that the filter of Example 1 had a back pressure compared to the filter of Comparative Example 2. It was confirmed that the reduction effect and nitrogen oxide removal efficiency were large.
  • Example 3 the same denitrification catalyst as in Example 1 of the present invention was coated on various types of particulate collectors to perform engine dynamometer performance tests, and the results are shown in Table 3 below.
  • a symmetric filter in which the cell size of the upstream side through which the exhaust gas flows in and the cell size of the downstream side through which the exhaust gas is discharged are the same (Example 2) and the same symmetrical filter as in Example 2, but with a filter (Example 3) to which a SiC material was applied instead of cordierite, and a honeycomb cell structure made of the same cordierite material as in Example 1 was tested.
  • An asymmetric filter in which the cell size of the upstream side where the exhaust gas flows in and the cell size of the downstream side where the exhaust gas is discharged are different from each other, for example, the upstream cell size is 1.2 times larger than the downstream cell size.
  • a larger filter (Example 4) was tested.
  • the symmetric particle collecting device made of cordierite (Example 2) has the most excellent effect in terms of back pressure and NOx emission, but the SDPF of Examples 2 to 4 uses SiC as the material of the particle collecting device ( Example 3), even if the particle collecting device made of cordierite is asymmetric rather than symmetrical (Example 4), it was confirmed that there is an excellent effect in terms of back pressure and NOx emission compared to Comparative Examples 1 and 2.
  • urea (or urea water), a reducing agent, is converted into ammonia by the heat of exhaust gas by the coated denitrification catalyst, and the denitration catalyst (or selective reduction catalyst) ), as a catalytic reaction between nitrogen oxides (NO x ) and ammonia (NH 3 ) in exhaust gas, nitrogen oxides are reduced to nitrogen gas (N 2 ) and water (H 2 O).
  • the urea mixer 32 is for connecting so as to be able to communicate between the first container 20 including the diesel oxidation catalyst device 21 and the second container 40 including the SDPF 41 Provided in the exhaust gas flow conduit 30, the exhaust gas passing through the diesel oxidation catalyst device 21 and the urea aqueous solution introduced into the inside through the urea inductor 31 can be mixed.
  • the urea injector 31 is provided on one side of the pipe of the exhaust gas flow pipe 30 so as to inject urea into the exhaust gas flow pipe 30, and may be provided at the front end of the urea mixer 32 (See Fig. 3a).
  • the urea mixer 32 may have various shapes, but the urea mixer 32 according to an embodiment of the present invention has a ring-shaped ring shape, as shown in FIGS. 7(b) and 8. It includes a body 321 and a plurality of blade blades 323 provided to be spaced apart from each other along the inner circumferential surface of the body 321, but the blade 323 is an extension formed extending from the inner circumferential surface of the body 321 toward the inside ( 3231), and a wing piece 3232 bent clockwise or counterclockwise at the inner end of the extension piece.
  • the wing piece 3232 is formed to extend to be bent toward the SDPF 41, and the blade 323 has a twisted screw shape to induce a screw-like air flow.
  • Figure 7 (a) is a perspective view of the urea mixer 32 according to an embodiment of the present invention
  • Figure 7 (b) is a bottom view
  • Figure 7 (c) is a side view.
  • the urea mixer 32 extends from at least one of the ring-shaped body 321 and the inner circumferential surface of the body 321 toward the center. It may include a rib 322 having at least one crossbar crossing the inner circumferential surface of the body 321 and a blade 323 extending from the inner circumferential surface of the body 321 toward the inside.
  • the blade 323 includes a flat, approximately trapezoidal extension 3231 and a free end of the extension 3231, that is, the inner side of the body 321 of the extension 3231. It may include a wing piece 3232 bent in one direction at an end extending toward the end.
  • One end 3231b of the extension 3231 is fixed to the inner circumferential surface of the body 321, another end 3231a of the extension 3231 is fixed to the rib 322, and another end
  • the wing piece 3232 may be provided.
  • the wing piece 3232 bent in either direction at the inner distal end of the extension piece 3231 may have a flag shape or a trapezoidal shape on a plate.
  • a part of the wing piece 3232 is shown in FIG. 7 As shown in (c), it may be formed to protrude out of the body 321 of the urea mixer 32, and at this time, although not particularly limited, the corner of the free end of the wing piece 3232 is chamfered to be rounded It can be.
  • the wing piece 3232 extending from the oblique side which is the distal end of the trapezoidal extension piece 3231, extends so as to protrude out of the body 321.
  • the wing piece 3232 extends from the oblique side of the extension piece 3231. It extends to be bent by a predetermined angle in a clockwise or counterclockwise direction, and its end may extend to the crosspiece to which the adjacent blade 323 is fixed.
  • the urea mixer 32 (see FIG. 6 (b)) according to an embodiment of the present invention was compared with a known urea mixer 320 (see FIG. 6 (a)) in a different shape and back pressure change, etc., and the results was as shown in Table 4 below.
  • the comparison target urea mixer 320 shown in FIG. 6 (a) has a ring-shaped body 3201 and extends inward from one end of the body 3201, in either direction. It may include a plurality of plate-shaped blades 3202 inclined to .
  • the SDPF 41 has a selective catalytic reduction device. (42) may be additionally provided.
  • a zeolite catalyst such as aluminosilicate doped with iron or copper or a vanadium-based catalyst doped with vanadium in titania is supported on a carrier such as ceramic honeycomb.
  • urea a reducing agent
  • nitrogen oxides are converted into nitrogen gas as a catalytic reaction between nitrogen oxides (NO x ) and ammonia (NH 3 ) in the exhaust gas by the denitrification catalyst (or selective reduction catalyst).
  • NO x nitrogen oxides
  • NH 3 ammonia
  • the SDPF 41 in addition to the diesel oxidation catalyst device 21 and the SDPF 41, the SDPF 41 has an ammonia slip catalyst device at the rear end.
  • AOC Ammonia Oxidation Catalyst
  • NH 3 ammonia
  • N 2 nitrogen
  • H 2 O water
  • ammonia discharged from the SDPF 41 It is also possible to prevent ammonia from escaping into the atmosphere by purifying it.
  • ammonia slip catalyst device 43 similar to the diesel oxidation catalyst device 21, also uses platinum (Pt), palladium (Pd), rhodium, etc.
  • a noble metal such as (Rh) may be constituted as a catalyst.
  • urea is not injected through the urea injector 31 located on one side of the exhaust gas flow pipe 30.
  • the urea inlet 11 into which the urea aqueous solution is introduced is located at the front end of the diesel oxidation catalyst device 21, and the urea aqueous solution introduced through the urea inlet 11 is the diesel oxidation catalyst device ( 21), the urea aqueous solution and/or the ammonia hydrolyzed by the heat of the exhaust gas by passing through the urea flow conduit 12, which is a reducing agent, can be sprayed onto one side of the SDPF 41.
  • the urea aqueous solution introduced through the urea inlet 11 passes through the urea flow pipe 12 formed through the diesel oxidation catalyst device 21 in the longitudinal direction so that the urea aqueous solution and/or ammonia can be injected into the SDPF 41.
  • An air compressor 111 may be connected to one side of the branch pipe 113 provided between the urea storage tank 112 and the urea inlet 110. That is, the urea aqueous solution discharged from the urea storage tank 112 via the high-pressure air provided by the air compressor 111 is pressurized into the urea flow pipe 12 and can pass through the urea flow pipe 12.
  • the diesel oxidation catalyst device 21 may include a through hole formed through in the longitudinal direction so that the urea flow pipe 12 can be inserted and installed in the longitudinal direction. That is, the through hole into which the urea flow conduit 12 is inserted is formed along the longitudinal direction at the center of the diesel oxidation catalyst device 21, so that when the diesel oxidation catalyst device 21 generates heat due to oxidation of exhaust gas, It is preferable to ensure that the heat can be effectively transferred to the urea aqueous solution passing through the urea flow conduit 12.
  • the urea flow pipe line 12 inserted into the through hole of the diesel oxidation catalyst device 21 is a heat conductor, for example, a metal material (Ag, Cu, Al) so that the heat generated from the diesel oxidation catalyst device 21 can be well transferred. , Au, etc.) is preferred.
  • the urea aqueous solution passing through the urea flow pipe 12 is heated by the reaction heat of the diesel oxidation catalyst device 21 without relying on a separate heating device (or heating device) to smoothly cause a hydrolysis reaction.
  • the urea mixer 32 may be provided to be located at the downstream end of the urea flow pipe 12.
  • FIG. 4 is a view showing an appearance of an exhaust gas post-treatment system according to another embodiment of the present invention.
  • a first container 20 including a diesel oxidation catalyst device 21, a second container 40 including an SDPF 41, and the The exhaust gas flow pipe 30 through which the exhaust gas flows between the first and second containers may be connected in series with each other, but the present invention is not limited thereto, and according to another embodiment, as shown in FIG. 4 , The first container 20, the exhaust gas flow pipe 30 and the second container 40 may be connected in parallel with each other.
  • a first connection duct 25 may be provided to connect the end opposite to the end of one side to which fuel is supplied to (23) and the end of the exhaust gas flow pipe 30 so as to communicate with each other, and similarly, the second container A second connection duct 35 may be provided to connect the other end of the 40 (an end opposite to one end from which the purified exhaust gas is discharged) and the other end of the exhaust gas flow pipe 30 so as to communicate with each other.
  • non-explained reference numeral 30a in FIG. 4 is a urea injection hole 30a formed through the first connection duct 25, through which urea can be injected and injected into the exhaust gas flow pipe 30.
  • reference numeral 20a in FIG. 4 indicates a fuel inlet to which fuel used by the burner 23 is supplied
  • reference numeral 22a is an exhaust gas inlet, which is a connection hole through which exhaust gas generated from the engine 1 flows.
  • reference numeral 40a indicates an exhaust gas outlet through which the exhaust gas purified by the exhaust gas post-treatment system is discharged
  • reference numeral 32a indicates a mixer housing 32a having a urea mixer 32 therein
  • the mixer housing 32a may be interposed in the middle of the exhaust gas flow pipe 30, but the present invention is not limited thereto, and the mixer housing 32a may be provided at the front end of the exhaust gas flow pipe 30. .

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Catalysts (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un système de post-traitement de gaz d'échappement comprenant un filtre revêtu d'un catalyseur de dénitrification. Le système de post-traitement de gaz d'échappement, comprenant un catalyseur d'oxydation diesel (DOC) et monté sur un tuyau d'échappement d'un moteur à combustion pour oxyder les hydrocarbures (HC) ou le monoxyde de carbone (CO) inclus dans des gaz d'échappement ou pour oxyder une fraction organique soluble (SOF) incluse dans une matière particulaire, comprend en outre une réduction catalytique sélective sur filtre à particules diesel (SCR sur DPF, ou SDPF) revêtu d'un catalyseur de dénitrification pour purifier l'oxyde d'azote (NOx) sur un filtre à particules diesel (DPF) pour purifier des gaz d'échappement par collecte de la matière particulaire, le filtre à particules diesel étant revêtu du catalyseur de dénitrification dans un état de suspension ayant une taille de particule de 2 à 4 µm, un pH de 5 à 7 et une viscosité de 150 à 300 cp.
PCT/KR2022/011768 2021-09-23 2022-08-08 Système de post-traitement de gaz d'échappement pour moteur diesel comprenant un filtre revêtu d'un catalyseur de dénitrification Ceased WO2023048398A1 (fr)

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KR1020210125583A KR102441028B1 (ko) 2021-09-23 2021-09-23 탈질촉매가 코팅된 필터를 포함한 디젤엔진용 배기가스 후처리 시스템
KR10-2021-0125583 2021-09-23

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KR102293242B1 (ko) * 2020-04-14 2021-08-26 한국전력공사 발전용 디젤엔진의 촉매필터 및 이를 이용한 배기가스 정화장치

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KR100517568B1 (ko) * 2002-06-13 2005-09-28 도요다 지도샤 가부시끼가이샤 배기가스를 정화하는 필터촉매
JP2009019610A (ja) * 2007-07-13 2009-01-29 Hino Motors Ltd 排気浄化装置
JP2011012564A (ja) * 2009-06-30 2011-01-20 Toyota Industries Corp 排気ガス浄化装置
US20140133268A1 (en) * 2011-06-20 2014-05-15 Office Metallurgiche G. Cornaglia S.P.A. Static mixer for the treatment of exhaust gases and manufacturing method thereof
KR20150096329A (ko) * 2014-02-14 2015-08-24 도이츠 악티엔게젤샤프트 디젤엔진 배기가스의 정화 방법
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