CN112127975A - Catalysis method and device for emission control of hybrid diesel engine - Google Patents

Catalysis method and device for emission control of hybrid diesel engine Download PDF

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Publication number
CN112127975A
CN112127975A CN202011184304.XA CN202011184304A CN112127975A CN 112127975 A CN112127975 A CN 112127975A CN 202011184304 A CN202011184304 A CN 202011184304A CN 112127975 A CN112127975 A CN 112127975A
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catalyst
diesel engine
stage scr
emission control
dpf
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原新涛
陶泽民
杨树宝
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Guangxi Yuchai Machinery Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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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
    • F01N3/08—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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • 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 ; Methods of operation or control of catalytic converters
    • 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 ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10—Carbon or carbon oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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

Abstract

The invention discloses a catalytic method for emission control of a hybrid diesel engine, belongs to the field of catalytic devices for emission control of diesel engines, and solves the problem of low conversion efficiency of the traditional catalytic method for emission control of the hybrid diesel engine. The method is that the tail gas flows through a front-stage SCR catalyst, a DOC catalyst, a DPF catalyst, a rear-stage SCR catalyst and an ASC catalyst in sequence to be decomposed and purified. The method for controlling and catalyzing the emission of the hybrid diesel engine can effectively improve the conversion efficiency of the low-load operation condition of the hybrid diesel engine and meet the emission requirement. The invention also discloses a catalytic device for controlling the emission of the hybrid diesel engine. The emission control catalytic device of the hybrid diesel engine reasonably optimizes the structural arrangement of the catalytic device and effectively improves the conversion efficiency.

Description

Catalysis method and device for emission control of hybrid diesel engine
Technical Field
The invention relates to a catalytic device for diesel engine emission control, in particular to a catalytic method and a catalytic device for hybrid diesel engine emission control.
Background
At present, the mainstream technical route of emission control of the national six diesel engine is DOC + DPF + SCR + ASC, and the exhaust gas is determined according to the running process of the diesel engineThe secondary flow is through DOC, DPF, SCR and ASC catalysts. When exhaust gas flows through DOC, HC and CO in the exhaust gas are oxidized into CO under the catalytic action of the oxidation catalyst2And H2O, effecting the purification of CO and HC, and NO in the exhaust gas is oxidized to NO2 by the catalytic action of the oxidation catalyst. When exhaust gas flows through the DPF, particulate components in the exhaust gas are trapped and intercepted by the wall-flow DPF, thereby achieving purification of particulates. Tail gas enters an SCR catalyst, NH3With NOx reacting to form N within the catalyst2And H20, realization of NOxPurifying; finally, the ASC converts the excess NH after SCR3By oxidation to N2And H20。
But to hybrid diesel engine type, satisfying under the demand of higher fuel economy, the former quick-witted emission of engine compares the former quick-witted emission of traditional diesel engine and can promote a little, and hybrid diesel vehicle has frequent start-stop operating mode moreover for the more operation of catalyst converter is in the low temperature operating mode, and SCR leans on the back relatively again, leads to SCR operating temperature low, and conversion efficiency is low, finally leads to NOxIt is difficult to meet the emission index requirements.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide a catalytic method for controlling the emission of a hybrid diesel engine, which can effectively improve the conversion efficiency of the low-load operation condition of the hybrid diesel engine and meet the emission requirement.
The second purpose is to provide a catalytic device for controlling the emission of the hybrid diesel engine, reasonably optimize the structural arrangement of the catalytic device and effectively improve the conversion efficiency.
The technical scheme of the invention is as follows: the exhaust gas is made to flow through the front SCR catalyst, DOC catalyst, DPF catalyst, back SCR catalyst and ASC catalyst successively for decomposition and purification.
As a further improvement, the method comprises the following specific steps:
s1, pre-stage SCR catalysis: part of NO in exhaust gasxAnd NH3Internal reaction to N in front SCR catalyst2And H20, realization of NOxThe first purification of (1);
s2, DOC catalysis: HC and CO in the exhaust gas are oxidized into CO under the catalysis of the oxidation catalyst in the DOC catalyst2And H2O, to purify CO and HC, and NO in the exhaust gas is oxidized to NO by the catalytic action of the oxidation catalyst2；
S3, DPF catalysis: the particle components in the tail gas are captured and intercepted by the wall-flow DPF in the DPF catalyst, so that the particle purification is realized;
s4, post-SCR catalysis: NO in exhaust gasxAnd NH3The inside of the rear-stage SCR catalyst is reacted again to generate N2And H20, realizing the purification of NOx again;
s5, ASC catalysis: excess NH treated by S4 by ASC catalyst3By oxidation to N2And H2And 0, realizing the decomposition and purification of the tail gas.
Further, the tail gas is in an S-shaped route along the gas flow flowing by the front-stage SCR catalyst, the DOC catalyst, the DPF catalyst, the rear-stage SCR catalyst and the ASC catalyst.
The second technical scheme of the invention is as follows: the utility model provides a catalytic unit of hybrid diesel engine emission control, includes DOC catalyst converter, DPF catalyst converter and ASC catalyst converter, still includes preceding stage SCR catalyst converter and back level SCR catalyst converter, preceding stage SCR catalyst converter, DOC catalyst converter, DPF catalyst converter, back level SCR catalyst converter, ASC catalyst converter communicate in proper order, preceding stage SCR catalyst converter arrange near the turbo charger one side of diesel engine, and the one end that is close to preceding stage SCR catalyst converter is equipped with the interface that admits air, and the one end that is close to the ASC catalyst converter is equipped with the exhaust interface.
As a further improvement, the exhaust device also comprises a first shell and a second shell, wherein the first shell is communicated with the second shell, the air inlet interface is arranged at one end of the first shell, and the exhaust interface is arranged on the second shell at the end opposite to the air inlet interface.
Further, preceding stage SCR catalyst converter, DOC catalyst converter, DPF catalyst converter all install in first shell, just preceding stage SCR catalyst converter, DOC catalyst converter, DPF catalyst converter arrange in proper order to exhaust interface one end from the interface one end that admits air, back stage SCR catalyst converter, ASC catalyst converter all install in the second shell, just back stage SCR catalyst converter, ASC catalyst converter arrange in proper order to exhaust interface one end from the interface one end that admits air.
Further, the first shell is communicated with the second shell through a urea mixer, and a urea nozzle is arranged on the urea mixer.
Furthermore, the one end of urea blender and the first shell intercommunication of the opposite end of interface of admitting air, the other end and the second shell intercommunication of the opposite end of exhaust interface of urea blender, the urea nozzle install on the urea blender with the same end of exhaust interface.
Further, the injection direction of the urea nozzle is aligned with the axial direction of the urea mixer.
Furthermore, a urea mixer and a urea nozzle are arranged on the air inlet pipeline corresponding to the front end of the air inlet interface.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
1. according to the emission control catalysis method of the hybrid diesel engine, the front-stage SCR catalyst is added on the original catalysis route, and the tail gas is firstly oxidized and catalyzed by the front-stage SCR and then enters the traditional DOC catalyst, so that the position advantage of the front-stage SCR can be utilized under the low-temperature working condition, the conversion efficiency of the hybrid diesel engine under the low-load operation working condition is effectively improved, and the original NO with high load is utilizedxWhen in emission, NO can be converted by using SCR catalyst at front stagexThe control treatment is in a reasonable range, and the final treatment is finished by the rear-stage SCR catalyst, so that the emission requirement is met.
2. According to the emission control catalytic device of the hybrid diesel engine, the structural arrangement of the catalytic device is reasonably optimized through the S-shaped arrangement of the front-stage SCR catalyst, the DOC catalyst, the DPF catalyst, the rear-stage SCR catalyst and the ASC catalyst, the structural arrangement is compact, the whole vehicle is convenient to match, the airflow flows in an S-shaped manner, and the conversion efficiency is effectively improved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
fig. 2 is a schematic cross-sectional structure of the present invention.
Wherein: the device comprises a 1-front-stage SCR catalyst, a 2-DOC catalyst, a 3-DPF catalyst, a 4-rear-stage SCR catalyst, a 5-ASC catalyst, a 6-air inlet interface, a 7-exhaust interface, an 8-first shell, a 9-second shell, a 10-urea mixer and an 11-urea nozzle.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1-2, in the catalytic method for controlling emissions of a hybrid diesel engine according to the present invention, exhaust gas sequentially flows through a front-stage SCR catalyst 1, a DOC catalyst 2, a DPF catalyst 3, a rear-stage SCR catalyst 4, and an ASC catalyst 5 to be decomposed and purified. The method comprises the following specific steps:
s1, pre-stage SCR catalysis: part of NO in exhaust gasxAnd NH3Internal reaction to N in the front SCR catalyst 12And H20, realization of NOxThe first purification of (1);
s2, DOC catalysis: HC and CO in the exhaust gas are oxidized into CO by the catalytic action of the oxidation catalyst in the DOC catalyst 22And H2O, to purify CO and HC, and NO in the exhaust gas is oxidized to NO by the catalytic action of the oxidation catalyst2；
S3, DPF catalysis: particulate components in the exhaust gas are captured and intercepted by the wall-flow type DPF in the DPF catalyst 3, thereby realizing the purification of particulates;
s4, post-SCR catalysis: NO in exhaust gasxAnd NH3N is generated by the reaction again in the rear-stage SCR catalyst 42And H20, realizing the purification of NOx again;
s5, ASC catalysis: the ASC catalyst 5 treats excess NH after S4 treatment3By oxidation to N2And H2And 0, realizing the decomposition and purification of the tail gas.
Hybrid diesel engine emissions of the present inventionThe catalytic control method is characterized in that a preceding stage SCR catalyst 1 is added on an original catalytic route, and tail gas is firstly oxidized and catalyzed by the preceding stage SCR catalyst 1 and then enters a traditional DOC catalyst 2, so that on one hand, the position advantage of the preceding stage SCR catalyst 1 can be utilized under a low-temperature working condition to effectively improve the conversion efficiency of a low-load operation working condition of the hybrid diesel engine, and on the other hand, the conversion efficiency of the original high-load original NO is improvedxWhen discharging, NO can be discharged by using the SCR catalyst 1 at the front stagexThe control treatment is in a reasonable range, and the final treatment is finished by the rear-stage SCR catalyst 4, so that the emission requirement is met.
Preferably, the tail gas of the diesel engine flows along the front-stage SCR catalyst 1, the DOC catalyst 2, the DPF catalyst 3, the rear-stage SCR catalyst 4 and the ASC catalyst 5 to form an S-shaped route, and a zigzag and circuitous airflow direction is adopted, so that the tail gas is fully contacted with the catalysts, and the layout between the catalysts can be optimized on the other side, so that the diesel engine is more compact in structure.
The utility model provides a catalytic unit of hybrid diesel engine emission control, including DOC catalyst converter 2, DPF catalyst converter 3 and ASC catalyst converter 5, still include preceding stage SCR catalyst converter 1 and back stage SCR catalyst converter 4, wherein, preceding stage SCR catalyst converter 1, DOC catalyst converter 2, DPF catalyst converter 3, back stage SCR catalyst converter 4, ASC catalyst converter 5 communicates in proper order, preceding stage SCR catalyst converter 1 is close to the turbo charger one side of diesel engine and arranges, and the one end that is close to preceding stage SCR catalyst converter 1 is equipped with inlet interface 6, the one end that is close to ASC catalyst converter 5 is equipped with exhaust interface 7. When the diesel engine operates, tail gas enters from the air inlet interface 6 and is oxidized and catalyzed by the front-stage SCR catalyst 1, the DOC catalyst 2, the DPF catalyst 3, the rear-stage SCR catalyst 4 and the ASC catalyst 5 in sequence, so that the decomposition and purification of the tail gas are realized.
Preferably, the catalytic device of the present invention further includes a first housing 8 and a second housing 9, wherein the first housing 8 is communicated with the second housing 9, the air inlet 6 is disposed at one end of the first housing 8, the exhaust port 7 is disposed on the second housing 9 at an end opposite to the air inlet 6, and the first housing 8 and the second housing 9 are disposed to facilitate installation of each catalyst, and simultaneously protect each catalyst.
Preferably, preceding stage SCR catalyst 1, DOC catalyst 2, DPF catalyst 3 all installs in first shell 8, and preceding stage SCR catalyst 1, DOC catalyst 2, DPF catalyst 3 arranges in proper order from the interface 6 one end that admits air to 7 one ends of exhaust interface, back stage SCR catalyst 4, ASC catalyst 5 all installs in second shell 9, and back stage SCR catalyst 4, ASC catalyst 5 arranges in proper order from the interface 6 one end that admits air to 7 one ends of exhaust interface, guarantee that tail gas flows through preceding stage SCR catalyst 1 in proper order, DOC catalyst 2, DPF catalyst 3, back stage SCR catalyst 4, ASC catalyst 5 is by oxidation catalysis.
Preferably, the first casing 8 and the second casing 9 are communicated with each other through a urea mixer 10, a urea nozzle 11 is provided on the urea mixer 10, and urea solution is injected into the urea mixer 10 through the urea nozzle 11 to be mixed with the exhaust gas and decomposed into NH3And enters the rear-stage SCR catalyst 4 to participate in the reaction. Similarly, in order to ensure the reaction, a urea mixer 10 and a urea nozzle 11 are further arranged on the air inlet pipeline corresponding to the front end of the air inlet interface 6, so as to ensure that the gas entering the front-stage SCR catalyst 1 can be subjected to catalytic oxidation reaction.
Preferably, the one end of urea mixer 10 communicates with the first shell 8 of the opposite one end of interface 6 that admits air, the other end of urea mixer 10 communicates with the second shell 9 of the opposite one end of exhaust interface 7, urea nozzle 11 is installed on the urea mixer 10 with the same one end of exhaust interface 7, make preceding stage SCR catalyst converter 1, DOC catalyst converter 2, DPF catalyst converter 3, back-stage SCR catalyst converter 4, ASC catalyst converter 5 is the S type setting, rationally optimized catalytic device' S structural arrangement, the structural arrangement is compact, make things convenient for the whole car to form a complete set, its air current flow direction is the S type and flows, effectively improve conversion efficiency.
Preferably, the injection direction of the urea nozzle 11 is aligned with the axial direction of the urea mixer 10, so that the mixing time of the urea solution and the exhaust gas is increased, and the mixing effect is further improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the invention, which will not affect the effect of the invention and the practicability of the patent.

Claims (10)

1. A catalytic method for controlling the discharge of a hybrid diesel engine is characterized in that tail gas flows through a front-stage SCR catalyst (1), a DOC catalyst (2), a DPF catalyst (3), a rear-stage SCR catalyst (4) and an ASC catalyst (5) in sequence to be decomposed and purified.
2. A catalytic method for hybrid diesel engine emission control according to claim 1, characterized in that it comprises the following specific steps:
s1, pre-stage SCR catalysis: part of NO in exhaust gasxAnd NH3N is generated by reaction in the front stage SCR catalyst (1)2And H20, realization of NOxThe first purification of (1);
s2, DOC catalysis: HC and CO in the exhaust gas are oxidized into CO under the catalytic action of the oxidation catalyst in the DOC catalyst (2)2And H2O, to purify CO and HC, and NO in the exhaust gas is oxidized to NO by the catalytic action of the oxidation catalyst2；
S3, DPF catalysis: particulate components in the exhaust gas are captured and intercepted by a wall-flow DPF in a DPF catalyst (3), so that the purification of particulates is realized;
s4, post-SCR catalysis: NO in exhaust gasxAnd NH3N is generated by the secondary reaction in the rear-stage SCR catalyst (4)2And H20, realizing the purification of NOx again;
s5, ASC catalysis: the ASC catalyst (5) treats excess NH after S4 treatment3By oxidation to N2And H2And 0, realizing the decomposition and purification of the tail gas.
3. A catalytic method for hybrid diesel engine emission control according to claim 1 or 2, characterized in that the exhaust gas flows along the gas flow of the front stage SCR catalyst (1), DOC catalyst (2), DPF catalyst (3), rear stage SCR catalyst (4), ASC catalyst (5) in an S-shaped route.
4. The device for realizing the catalytic method of the emission control of the hybrid diesel engine of claim 3 comprises a DOC (2), a DPF (3) and an ASC (5), and is characterized by further comprising a front-stage SCR (1) and a rear-stage SCR (4), wherein the front-stage SCR (1), the DOC (2), the DPF (3), the rear-stage SCR (4) and the ASC (5) are sequentially communicated, the front-stage SCR (1) is arranged close to one side of a turbocharger of the diesel engine, an air inlet interface (6) is arranged at one end close to the front-stage SCR (1), and an exhaust interface (7) is arranged at one end close to the ASC (5).
5. A hybrid diesel engine emission control catalytic device according to claim 4, further comprising a first housing (8) and a second housing (9), said first housing (8) being in communication with said second housing (9), said intake port (6) being provided at one end of said first housing (8), said exhaust port (7) being provided on said second housing (9) at an end opposite to said intake port (6).
6. The catalytic device for emission control of the hybrid diesel engine as recited in claim 5, wherein the front stage SCR catalyst (1), the DOC catalyst (2), and the DPF catalyst (3) are all installed in the first housing (8), and the front stage SCR catalyst (1), the DOC catalyst (2), and the DPF catalyst (3) are sequentially arranged from one end of the air inlet interface (6) to one end of the exhaust interface (7), and the rear stage SCR catalyst (4) and the ASC catalyst (5) are all installed in the second housing (9), and the rear stage SCR catalyst (4) and the ASC catalyst (5) are sequentially arranged from one end of the air inlet interface (6) to one end of the exhaust interface (7).
7. A hybrid diesel engine emission control catalyst arrangement according to claim 5 or 6, characterized in that the first housing (8) and the second housing (9) are in communication via a urea mixer (10), said urea mixer (10) being provided with urea nozzles (11).
8. A hybrid diesel engine emission control catalyst device according to claim 7, characterized in that one end of the urea mixer (10) communicates with a first housing (8) at the end opposite the inlet connection (6), the other end of the urea mixer (10) communicates with a second housing (9) at the end opposite the outlet connection (7), and the urea nozzle (11) is mounted on the urea mixer (10) at the same end as the outlet connection (7).
9. A hybrid diesel engine emission control catalyst device according to claim 7, characterized in that the injection direction of the urea injection nozzle (11) is aligned with the axial direction of the urea mixer (10).
10. A catalytic unit for hybrid diesel engine emission control according to claim 7, characterized in that a urea mixer (10) and a urea nozzle (11) are also provided on the intake pipe corresponding to the front end of the intake port (6).
CN202011184304.XA 2020-10-30 2020-10-30 Catalysis method and device for emission control of hybrid diesel engine Pending CN112127975A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113230887A (en) * 2021-04-13 2021-08-10 河南柴油机重工有限责任公司 SCR (Selective catalytic reduction) catalytic converter with high catalytic efficiency
CN114961929A (en) * 2021-05-14 2022-08-30 无锡威孚力达催化净化器有限责任公司 Control method of two-stage post-processing system, device terminal and readable storage medium
CN116104617A (en) * 2023-04-13 2023-05-12 潍柴动力股份有限公司 SCR efficiency control method and device and SCR system
CN116291834A (en) * 2023-03-22 2023-06-23 盐城工学院 SCR series system of high-density diesel engine

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