CN102373997B - SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment - Google Patents
SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment Download PDFInfo
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- CN102373997B CN102373997B CN2011102890165A CN201110289016A CN102373997B CN 102373997 B CN102373997 B CN 102373997B CN 2011102890165 A CN2011102890165 A CN 2011102890165A CN 201110289016 A CN201110289016 A CN 201110289016A CN 102373997 B CN102373997 B CN 102373997B
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- right baffle
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- catalytic converter
- mixing chamber
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- 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
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Abstract
The invention provides an SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment. The SCR catalytic converter comprises a shell, a left baffle, a right baffle, a gas inlet tube, a gas return pipe, a gas outlet tube and a catalyst carrier component, wherein the left and right baffles are installed in the shell at intervals and divide the shell into a gas suction cavity, a mixed cavity and a gas exhaust cavity; the left baffle is provided with multiple opening holes which can communicate the gas suction cavity with the mixed cavity; the gas inlet tube is inserted in the shell from the left end face of the shell, penetrates through the left baffle and is closely connected with the right baffle, the gas inlet tube is provided with multiple rows of small holes at the position of the mixed cavity; the gas return pipe is inserted from the left baffle, is closely connected with the right baffle and is provided with multiple rows of small holes; the gas outlet tube is inserted in the shell from the right end face of the shell; and the catalyst carrier component is arranged in the mixed cavity, the axial direction of the catalyst carrier component is in parallel to that of the gas inlet tube and is respectively communicated with the gas suction cavity and the gas exhaust cavity. The SCR catalytic converter provided by the invention has the advantages and characteristics of good flow property, better mixing property of exhausted gas and urea and moderate pressure loss, thus having a certain function of noise elimination.
Description
Technical field
The present invention relates to diesel exhaust aftertreatment system field, relate in particular the SCR catalyst converter that diesel engine vent gas is processed.
Background technique
Diesel engine is all having obvious advantage, particularly CO than petrol engine aspect power character, Economy and reliability
2Discharge lowly, its purposes expands on all kinds of vehicles gradually.But it is nitrogen oxide (NO that there is maximum problem in diesel engine
x) and particulate matter (PM) discharging seriously.Along with Chinese emission control regulations are more and more tighter, and domestic diesel engine performance and oil product problem, depend the emission controls by improving combustion measure alone and seem unable to do what one wishes, therefore be necessary to take the outer after-treatment device of machine to reach emissions object.
Diesel motor exhaust selective catalytic reduction technology (SCR) is the outer post-processing technology of a kind of machine of vehicle diesel engine, can effectively improve diesel engine NO
xDischarging, and insensitive to the diesel oil sulphur content.This technology is by spraying into certain density urea liquid, the NH that produces after pyrolysis (reaction 1) and hydrolysis (reaction 2) in outlet pipe
3And NO
xReduction reaction (reaction 3-5) occurs in catalytic converter, with NO
xBe converted into H
2O and N
2
(NH
2)
2CO→NH
3+HNCO (1)
H
2O+HNCO→NH
3+CO
2 (2)
4NO+4NH
3+O
2→4N
2+6H
2O (3)
2NH
3+NO+NO
2→2N
2+3H
2O (4)
6NO
2+8NH
3→7N
2+12H
2O (5)
For the main evaluation index of the SCR catalytic converter that is used for the diesel engine vent gas processing, can be estimated by following index:
1, the distribution of fluid between each catalyst carrier and the flow uniformity value of each catalyst carrier front-end face.
Improve the mass flow distribution of tail gas between each catalyst carrier, be conducive to improve the utilization ratio of carried catalyst, improve the transformation efficiency of catalyzer; Be conducive to reduce the pressure loss of air-flow on catalyst carrier; Be conducive to catalyst carrier and reach faster initiation temperature.
2, the pressure loss of system
A part of whole vent systems during the pressure loss of catalytic converter, the pressure loss that reduces catalytic converter is conducive to reduce the back pressure of vent systems, thereby is conducive to improve the performance of motor.
3, air speed
The size of air speed has been reacted the waiting time of air-flow on catalyst carrier.Air speed is less, and the waiting time of air-flow in catalyst carrier is longer, and transformation efficiency is just higher.
4, acoustic insertion loss
Summary of the invention
Purpose of the present invention is to provide the mixed performance of a kind of good flowing properties, exhaust and urea good, crushing is moderate, and has certain noise elimination function, is used for the SCR catalytic converter that diesel engine vent gas is processed.
For realizing above purpose, the technological scheme that this patent adopts is:
A kind of SCR catalytic converter for the diesel engine vent gas processing, comprise housing, right baffle-plate, right baffle plate, gas inlet pipe, gas backstreaming pipe, gas outlet tube and one or more catalyst carrier assembly that be arranged in parallel, the left baffle interval is arranged in housing, and housing is separated into the air-inlet cavity in left side, the mixing chamber of centre and the outlet chamber on right side; Right baffle-plate is separated air-inlet cavity and mixing chamber, and right baffle-plate is provided with a plurality of perforates, air-inlet cavity and mixing chamber can be communicated with; Right baffle plate is separated mixing chamber and outlet chamber; Gas inlet pipe is inserted in housing from the housing left side, passes right baffle-plate, is connected with right baffle plate sealing, and gas inlet pipe is opened the apertures of arranging in the mixing chamber position more; The gas backstreaming pipe inserts and is placed in described mixing chamber from right baffle-plate top, and is connected with right baffle plate sealing, opens the apertures of arranging on described gas backstreaming pipe more; The gas steam outlet pipe is from housing right side insertion housing; Described catalyst carrier assembly is arranged in mixing chamber, its axial and gas inlet tube parallel to an axis, and be connected between right baffle-plate and right baffle plate, be communicated with air inlet, two chambeies of giving vent to anger respectively, described each catalyst carrier assembly comprises at least one carrier, is coated on the outer liner of carrier and is coated on the outer shell of liner, and described carrier is provided with many axial passages that run through both ends of the surface.
According to the present invention, be provided with one or more catalyst carrier assemblies that be arranged in parallel in described mixing chamber, described each catalyst carrier assembly comprises the carrier of two or more series connection.Catalyst carrier assembly housing and liner can be protected and holding carrier, prevent that carrier lost efficacy at work.
According to the present invention, described each catalyst carrier is cylindrical structural, and is provided with vertically many parallel channels that run through both ends of the surface, and the internal surface of each passage is provided with catalyst coat.Described catalyzer is that zeolite based catalysts or scherbinaite are catalyst based.Axial passage on described carrier is straight way.
A kind of SCR catalytic converter for the diesel engine vent gas processing of the present invention, gas inlet pipe is connected with diesel engine exhaust, diesel engine exhaust and urea enter gas inlet pipe and enter mixing chamber by the aperture on it, gas and urea mix in mixing chamber, then the aperture from the right baffle-plate enters air-inlet cavity, enter outlet chamber by each axial passage in carrier again, discharge from tail pipe by gas outlet tube at last.
A kind of SCR catalytic converter for the diesel engine vent gas processing of the present invention, the structure of air-inlet cavity, mixing chamber, gas inlet pipe and gas reflow pipe can guarantee that urea and exhaust have enough spaces to mix.The present invention has the advantage and disadvantage that mixed performance is good, crushing is moderate of good flowing properties, exhaust and urea, and has the effect of certain noise elimination.
Fig. 1 is the overall structure schematic diagram of a kind of SCR catalytic converter of processing for diesel engine vent gas of the present invention.
Fig. 2 is the top plan view of Fig. 1.
Fig. 3 is the left view of Fig. 1.
Fig. 4 is the structural representation of one group of catalyst carrier assembly of the present invention.
Fig. 5 is the enlarged view at B place in Fig. 4.
Fig. 6 is the enlarged view at C place in Fig. 4.
Wherein: the 1-air-inlet cavity; The 2-mixing chamber; The 3-outlet chamber; The 4-housing; The 5-right baffle-plate; The 6-gas inlet pipe; 7-catalyst carrier assembly; 8-gas backstreaming pipe; The right baffle plate of 9-; The 10-gas outlet tube; Aperture on the 61-gas inlet pipe; 71,73-catalyst carrier; 72,74-catalyst carrier assembly liner; 75-catalyst carrier package shell; The aperture of 81-gas backstreaming pipe.
Embodiment
Referring to Fig. 1 and Fig. 2, a kind of SCR catalytic converter for the diesel engine vent gas processing, comprise air-inlet cavity 1, mixing chamber 2, outlet chamber 3, housing 4, right baffle-plate 5, gas inlet pipe 6, catalyst carrier assembly 7, gas backstreaming pipe 8,, right baffle plate 9, gas outlet tube 10.Right baffle-plate 5 and right baffle plate 9 intervals are arranged in housing 4, and housing 4 is separated into air-inlet cavity 1, mixing chamber 2 and outlet chamber 3; Right baffle-plate 5 is separated air-inlet cavity 1 and mixing chamber 2, and right baffle-plate 5 is provided with a plurality of perforates, air-inlet cavity 1 and mixing chamber 2 can be communicated with; Right baffle plate 9 is separated mixing chamber 2 and outlet chamber 3; Gas inlet pipe 6 is passed right baffle-plate 5 in inserting housing from top, housing left side, is connected with right baffle plate 9 sealings, and gas inlet pipe 6 is opened the apertures 61 of arranging in the mixing chamber position more; Gas backstreaming pipe 8 is placed in described mixing chamber 2 from right baffle-plate top insertion, and is connected with right baffle plate sealing, and opens many row's apertures 81 on gas backstreaming pipe 8; Gas outlet tube 10 inserts housing from bottom, housing right side; Catalyst carrier assembly 7 is arranged in mixing chamber, its axial and gas inlet tube parallel to an axis, and be connected between right baffle-plate 5 and right baffle plate 9, be communicated with air-inlet cavity 1 and outlet chamber 3 respectively.
Referring to Fig. 4, catalyst carrier assembly 7 comprises carrier 71,73, is coated on the outer liner 72 of carrier, 74 and be coated on the outer shell 75 of liner.Described catalyst carrier assembly 7 is in series by two catalyst carriers 71,73; Respectively outer liner 72,74 coatings of suppressed by vector of described each catalyst carrier 71,73, catalyst carrier package shell 75 with catalyst carrier 71,73 and liner 72,74 connect and coat.Described each catalyst carrier 71,73 is cylindrical structural, and it is axially arranged with many parallel channels 711,731 that connect both ends of the surface, and the internal surface of each passage is provided with catalyst coat.Shell and liner can be protected and holding carrier, prevent that carrier lost efficacy at work.
The working principle that the present invention is used for the SCR catalytic converter of diesel engine vent gas processing can be described as follows in conjunction with Fig. 1 and Fig. 2:
Claims (4)
1. one kind is used for the catalytic converter that diesel engine vent gas is processed, comprise housing (4), right baffle-plate (5), gas inlet pipe (6), gas backstreaming pipe (8), right baffle plate (9), gas outlet tube (10) and one or more catalyst carrier assembly (7) that be arranged in parallel, it is characterized in that described right baffle-plate (5) and right baffle plate (9) interval are arranged in described housing (4), described housing (4) is separated into the air-inlet cavity (1) in left side, middle mixing chamber (2) and the outlet chamber (3) on right side; Described right baffle-plate (5) is separated air-inlet cavity (1) and mixing chamber (2), and right baffle-plate (5) is provided with a plurality of perforates, air-inlet cavity (1) and mixing chamber (2) can be communicated with; Described right baffle plate (9) is separated mixing chamber (2) and outlet chamber (3); Described gas inlet pipe (6) is inserted in housing (4) from housing (4) left side, passes right baffle-plate (5), is connected with right baffle plate (9) sealing, and gas inlet pipe (6) is opened the apertures (61) of arranging in the mixing chamber position more; Described gas backstreaming pipe (8) inserts and is placed in described mixing chamber (2) from right baffle-plate (5), is connected with right baffle plate (9) sealing, opens many row's apertures (81) on described gas backstreaming pipe (8); Described gas outlet tube (10) is from housing (4) right side insertion housing (4); Described catalyst carrier assembly is arranged in mixing chamber (2), its axial and gas inlet tube (6) parallel to an axis, and be connected between right baffle-plate (5) and right baffle plate (9), and be communicated with air-inlet cavity (1) and outlet chamber (2) respectively, described each catalyst carrier assembly (7) comprises at least one carrier (71,73), is coated on the outer liner (72,74) of carrier and is coated on the outer shell (75) of liner, and described carrier (71,73) is provided with many axial passages (711,731) that run through both ends of the surface.
2. the catalytic converter for the diesel engine vent gas processing according to claim 1, is characterized in that described each catalyst carrier assembly (7) comprises the carrier (71,73) of two or more series connection.
3. the catalytic converter of processing for diesel engine vent gas according to claim 2, it is characterized in that each carrier (71,73) is cylindrical structural, and being provided with vertically many parallel channels (711,731) that run through both ends of the surface, the internal surface of each passage is provided with catalyst coat.
4. according to claim 1-3 any one described catalytic converter for the diesel engine vent gas processing, is characterized in that the axial passage (711,731) on described carrier (71,73) is the straight way passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102890165A CN102373997B (en) | 2011-09-26 | 2011-09-26 | SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102890165A CN102373997B (en) | 2011-09-26 | 2011-09-26 | SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment |
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| Publication Number | Publication Date |
|---|---|
| CN102373997A CN102373997A (en) | 2012-03-14 |
| CN102373997B true CN102373997B (en) | 2013-05-15 |
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|---|---|---|---|
| CN2011102890165A Active CN102373997B (en) | 2011-09-26 | 2011-09-26 | SCR (selective catalytic reduction) catalytic converter for diesel engine tail gas treatment |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102493859A (en) * | 2011-11-29 | 2012-06-13 | 杭州银轮科技有限公司 | Vehicle catalytic converter |
| WO2017054179A1 (en) * | 2015-09-30 | 2017-04-06 | Robert Bosch Gmbh | Swirl mixing type exhaust aftertreatment box and system |
| CN109162790B (en) * | 2018-07-02 | 2021-08-20 | 上海诺骋工程机械排气***有限公司 | Compact type tail gas post-treatment system |
Citations (5)
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|---|---|---|---|---|
| US5218817A (en) * | 1991-04-26 | 1993-06-15 | Honda Giken Kogyo Kabushiki Kaisha | Method and apparatus of purifying exhaust gas from internal combustion engine |
| DE202004013219U1 (en) * | 2004-08-16 | 2004-10-14 | As-Motor Germany Gmbh & Co. Kg | Exhaust silencer for an internal combustion engine comprises an inlet pipe passing through a wire catalyst and through which an exhaust gas flows against the direction of flow from a deviating chamber |
| CN101425258A (en) * | 2008-10-30 | 2009-05-06 | 周晓东 | LED screen information publishing method based on GPS and equipment thereof |
| CN201326445Y (en) * | 2008-12-18 | 2009-10-14 | 重庆迈崴机器有限公司 | Purification silencer for engine tail gas |
| CN201330637Y (en) * | 2008-12-18 | 2009-10-21 | 上海天纳克排气***有限公司研发分公司 | Catalytic converter used for exhaust system of diesel engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2836513B1 (en) * | 2002-02-25 | 2005-12-02 | Renault Vehicules Ind | EXHAUST LINE AND MOTOR VEHICLE THUS EQUIPPED |
| CN202360191U (en) * | 2011-09-26 | 2012-08-01 | 杭州银轮科技有限公司 | Diesel engine tail gas processing SCR catalytic converter |
-
2011
- 2011-09-26 CN CN2011102890165A patent/CN102373997B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5218817A (en) * | 1991-04-26 | 1993-06-15 | Honda Giken Kogyo Kabushiki Kaisha | Method and apparatus of purifying exhaust gas from internal combustion engine |
| DE202004013219U1 (en) * | 2004-08-16 | 2004-10-14 | As-Motor Germany Gmbh & Co. Kg | Exhaust silencer for an internal combustion engine comprises an inlet pipe passing through a wire catalyst and through which an exhaust gas flows against the direction of flow from a deviating chamber |
| CN101425258A (en) * | 2008-10-30 | 2009-05-06 | 周晓东 | LED screen information publishing method based on GPS and equipment thereof |
| CN201326445Y (en) * | 2008-12-18 | 2009-10-14 | 重庆迈崴机器有限公司 | Purification silencer for engine tail gas |
| CN201330637Y (en) * | 2008-12-18 | 2009-10-21 | 上海天纳克排气***有限公司研发分公司 | Catalytic converter used for exhaust system of diesel engine |
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| CN102373997A (en) | 2012-03-14 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A SCR catalytic converter for diesel exhaust treatment Effective date of registration: 20210610 Granted publication date: 20130515 Pledgee: Bank of China Limited by Share Ltd. Tiantai County branch Pledgor: ZHEJIANG YINLUN MACHINERY Co.,Ltd. Registration number: Y2021330000510 |
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Date of cancellation: 20220627 Granted publication date: 20130515 Pledgee: Bank of China Limited by Share Ltd. Tiantai County branch Pledgor: ZHEJIANG YINLUN MACHINERY Co.,Ltd. Registration number: Y2021330000510 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |