CN112343700A - Post-processing system and control method - Google Patents
Post-processing system and control method Download PDFInfo
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- CN112343700A CN112343700A CN202011240020.8A CN202011240020A CN112343700A CN 112343700 A CN112343700 A CN 112343700A CN 202011240020 A CN202011240020 A CN 202011240020A CN 112343700 A CN112343700 A CN 112343700A
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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
- 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
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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
- 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
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
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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
- F01N3/18—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]
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an aftertreatment system and a control method, wherein the aftertreatment system comprises an oxidation catalyst, a turbocharger, a particle trap and a selective oxidation catalyst; the turbocharger is in conduction connection with the particle trap through a first exhaust pipe; the particle catcher is in conduction connection with the selective oxidation catalyst through a second exhaust pipe; when the temperature in the first exhaust pipe is in the low-temperature range, the first supply device provides solid ammonia for the first exhaust pipe, the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate, and the solid ammonium nitrate is attached to the particle trap, so that the conversion efficiency of nitrogen oxide at low temperature is improved. When the temperature between the turbocharger and the particle catcher is higher than the highest temperature value of the low-temperature section, the first supply device stops supplying solid ammonia to the first exhaust pipe, and the second supply device supplies solid ammonia or urea water solution to the second exhaust pipe to oxidize nitrogen oxide so as to reduce the emission of nitrogen oxide in the exhaust gas.
Description
Technical Field
The invention relates to the technical field of post-processing, in particular to a post-processing system and a control method.
Background
At present, the content of NOx discharged by an aftertreatment system is high, and the emission requirements of seven or more countries cannot be met.
Therefore, how to reduce the emission of NOx is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, it is a first object of the present invention to provide an aftertreatment system capable of reducing NOx emissions.
A second object of the present invention is to provide an aftertreatment system control method.
In order to achieve the first object, the present invention provides the following solutions:
an aftertreatment system comprising an oxidation catalyst, a turbocharger, a particulate trap, and a selective oxidation catalyst;
the oxidation catalyst, the turbocharger, the particulate trap and the selective oxidation catalyst are sequentially connected in series and conducted along the exhaust gas discharge direction;
the turbocharger is in conduction connection with the particle trap through a first exhaust pipe, and the first exhaust pipe is in conduction connection with a first supply device for providing solid ammonia;
the particle catcher is in conduction connection with the selective oxidation catalyst through a second exhaust pipe, and the second exhaust pipe is in conduction connection with a second supply device for supplying solid ammonia or urea water solution;
when the temperature in the first exhaust pipe is in a low-temperature range, the first supply device provides solid ammonia for the first exhaust pipe, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate;
when the temperature in the first exhaust pipe is higher than the highest temperature value of the low-temperature section, the first supply device stops supplying solid ammonia to the first exhaust pipe, and the second supply device supplies solid ammonia or urea water solution to the second exhaust pipe to oxidize nitrogen oxides.
In a particular embodiment, the low temperature interval has a value ranging from greater than or equal to 150 ℃ and less than or equal to 200 ℃.
In another specific embodiment, the aftertreatment system further comprises a first nozzle;
the first nozzle is installed at a discharge port of the first supply device and is in conduction connection with the first exhaust pipe.
In another specific embodiment, the aftertreatment system further comprises a second nozzle;
the second nozzle is installed at the discharge port of the second supply device and is in conduction connection with the second exhaust pipe.
In another specific embodiment, the aftertreatment system further comprises a first temperature sensor;
the first temperature sensor is installed on the first exhaust pipe, and a probe of the first temperature sensor extends into the first exhaust pipe and is used for detecting the temperature in the first exhaust pipe.
In another specific embodiment, the aftertreatment system further comprises a second temperature sensor;
the second temperature sensor is installed on the second exhaust pipe, and a probe of the second temperature sensor extends into the second exhaust pipe and is used for detecting the temperature in the second exhaust pipe.
In another specific embodiment, when the temperature in the second exhaust pipe is greater than or equal to a first preset temperature value and less than a second preset temperature value, the second supply device sprays solid ammonia;
and when the temperature in the second exhaust pipe is greater than or equal to the second preset temperature value, the second supply device sprays urea aqueous solution.
In another specific embodiment, the first predetermined temperature value is 150 ℃ and the second predetermined temperature value is 180 ℃.
In another specific embodiment, the oxidation catalyst is a close-coupled oxidation catalyst;
and/or
The front area of the particle catcher is coated with a noble metal catalyst layer;
and/or
The aftertreatment system further comprises a third temperature sensor, a first nitrogen and oxygen detection sensor and a second nitrogen and oxygen detection sensor, a third exhaust pipe is connected to a discharge port of the selective oxidation catalyst in a conduction mode, the third temperature sensor is installed on the third exhaust pipe, a probe of the third temperature sensor extends into the third exhaust pipe and is used for detecting the temperature in the third exhaust pipe,
the first nitrogen and oxygen detection sensor is arranged on the third exhaust pipe, and a probe of the nitrogen and oxygen sensor extends into the third exhaust pipe and is used for detecting nitrogen oxides in the third exhaust pipe,
the second nitrogen oxide detection sensor is installed on the first exhaust pipe, and a probe of the second nitrogen oxide detection sensor extends into the first exhaust pipe and is used for detecting nitrogen oxide in the first exhaust pipe.
The various embodiments according to the invention can be combined as desired, and the embodiments obtained after these combinations are also within the scope of the invention and are part of the specific embodiments of the invention.
Without being limited to any theory, it can be seen from the above disclosure that, in the aftertreatment system disclosed by the invention, when the temperature between the turbocharger and the particle trap is in the low-temperature range, the first supply device supplies solid ammonia to the first exhaust pipe communicated between the turbocharger and the particle trap, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate which is attached to the particle trap, so that the conversion efficiency of nitrogen oxide at low temperature is improved. When the temperature between the turbocharger and the particle catcher is higher than the highest temperature value of the low-temperature section, the first supply device stops supplying solid ammonia to the first exhaust pipe, and the second supply device supplies solid ammonia or urea water solution to the second exhaust pipe to oxidize nitrogen oxide so as to reduce the emission of nitrogen oxide in the exhaust gas.
In addition, arrange oxidation catalyst converter before the whirlpool, promoted NO2 conversion efficiency, can promote the formation of ammonium nitrate during the low temperature, the interval that the temperature is suitable can improve the quick reaction ratio of SCR to improve the conversion efficiency of full operating mode nitrogen oxide.
In order to achieve the second object, the invention provides the following technical solutions:
an aftertreatment system control method, comprising:
step S1: judging whether the temperature between the inlet of the particle catcher and the outlet of the turbocharger is in a low-temperature range, if so, turning to the step S2, and if not, turning to the step S3;
step S2: spraying solid ammonia between the particle catcher and the turbocharger so that the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate;
step S3: and judging whether the temperature between the inlet of the particle trap and the outlet of the turbocharger is greater than the maximum temperature value of the low-temperature interval or not, if so, stopping spraying solid ammonia between the particle trap and the turbocharger, and spraying solid ammonia or urea aqueous solution between the particle trap and the selective oxidation catalyst to oxidize nitrogen oxide.
According to the aftertreatment system disclosed by the invention, when the temperature between the turbocharger and the particle trap is in a low-temperature range, solid ammonia is provided for the first exhaust pipe communicated between the turbocharger and the particle trap, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate which is attached to the particle trap, so that the conversion efficiency of nitrogen oxide at low temperature is improved. When the temperature between the turbocharger and the particle catcher is higher than the highest temperature value of the low-temperature interval, the supply of solid ammonia to the first exhaust pipe is stopped, and the solid ammonia or urea water solution is sprayed between the particle catcher and the selective oxidation catalyst to oxidize nitrogen oxides so as to reduce the emission of the nitrogen oxides in the exhaust gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an aftertreatment system according to the invention.
Wherein, in fig. 1:
the exhaust gas purification device comprises an oxidation catalyst 1, a turbocharger 2, a particulate trap 3, a selective oxidation catalyst 4, a first exhaust pipe 11, a second exhaust pipe 12, a first nozzle 5, a second nozzle 6, a first temperature sensor 7, a second temperature sensor 8, a third temperature sensor 9, a first nitrogen and oxygen detection sensor 10, a third exhaust pipe 13 and a second nitrogen and oxygen detection sensor 14.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to fig. 1 and the detailed description.
As shown in fig. 1, the present invention discloses an aftertreatment system, wherein the aftertreatment system comprises an oxidation catalyst 1, a turbocharger 2, a particulate trap 3, and a selective oxidation catalyst 4.
The oxidation catalyst 1, the turbocharger 2, the particulate trap 3, and the selective oxidation catalyst 4 are sequentially arranged in series in a conducting manner along the exhaust gas discharge direction.
The turbocharger 2 and the particle trap 3 are in conduction connection through a first exhaust pipe 11, the first exhaust pipe 11 is in conduction connection with a first supply device for providing solid ammonia, specifically, the first supply device comprises a solid ammonia source and a conduction pipeline, and the conduction pipeline is communicated with the solid ammonia source and the first exhaust pipe 11.
The particle trap 3 is connected in a flow-through manner to the selective oxidation catalytic converter 4 via a second exhaust line 12, the second exhaust line 12 being connected in a flow-through manner to a second supply device for supplying solid ammonia or an aqueous urea solution. Specifically, the second supply device includes a solid ammonia source and/or a urea source, and a communication pipeline, and the solid ammonia source and the urea source are respectively connected to the second exhaust pipe 12 through the communication pipeline.
When the temperature in the first exhaust pipe 11 is in the low temperature range, the first supply device supplies solid ammonia to the first exhaust pipe 11, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate.
When the temperature in the first exhaust pipe 11 is higher than the highest temperature value in the low temperature range, the first supply device stops supplying the solid ammonia to the first exhaust pipe 11, and the second supply device supplies the solid ammonia or the urea aqueous solution to the second exhaust pipe 12 to oxidize the nitrogen oxide.
According to the aftertreatment system disclosed by the invention, when the temperature between the turbocharger 2 and the particle trap 3 is in a low-temperature range, the first supply device provides solid ammonia for the first exhaust pipe 11 communicated between the turbocharger 2 and the particle trap 3, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate which is attached to the particle trap 3, so that the conversion efficiency of nitrogen oxide at low temperature is improved. When the temperature between the turbocharger 2 and the particulate trap 3 is higher than the highest temperature value in the low temperature range, the first supply device stops supplying solid ammonia to the first exhaust pipe 11, and the second supply device supplies solid ammonia or urea water solution to the second exhaust pipe 12 to oxidize nitrogen oxides so as to reduce the emission of nitrogen oxides in the exhaust gas.
In addition, arranging oxidation catalyst 1 before the whirlpool, having promoted NO2 conversion efficiency, can promoting the formation of ammonium nitrate when the low temperature, the interval that the temperature is suitable can improve the quick reaction proportion of SCR to improve the conversion efficiency of full operating mode nitrogen oxide.
In some embodiments, the range of the low temperature range is greater than or equal to 150 ℃ and less than or equal to 200 ℃, and it should be noted that the range is not limited to the above range, and may be set as needed.
In some embodiments, the aftertreatment system further comprises a first nozzle 5, the first nozzle 5 being mounted at the discharge of the first supply device and in fluid connection with the first exhaust pipe 11. The solid ammonia is sprayed into the first exhaust pipe 11 through the first nozzle 5, so that the contact uniformity of the solid ammonia and the nitrogen dioxide is improved.
In some embodiments, the aftertreatment system further comprises a second nozzle 6, the second nozzle 6 being mounted at the discharge of the second supply device and in fluid connection with the second exhaust pipe 12. Solid ammonia or urea aqueous solution is sprayed into the second exhaust pipe 12 through the second nozzle 6, so that the contact uniformity of the liquid ammonia and the nitrogen oxides is improved.
In some embodiments, the aftertreatment system further comprises a first temperature sensor 7, the first temperature sensor 7 being mounted on the first exhaust pipe 11, and a probe of the first temperature sensor 7 extending into the first exhaust pipe 11 for detecting a temperature of the gas in the first exhaust pipe 11. In particular, the first temperature sensor 7 is in signal connection with the first supply device.
Further, the invention discloses that the aftertreatment system further comprises a second temperature sensor 8, the second temperature sensor 8 is mounted on the second exhaust pipe 12, and a probe of the second temperature sensor 8 extends into the second exhaust pipe 12 and is used for detecting the temperature of gas in the second exhaust pipe 12. In particular, the second temperature sensor 8 is in signal connection with the second supply device. .
In some embodiments, when the temperature in the second exhaust pipe 12 is greater than or equal to a first preset temperature value and less than a second preset temperature value, the second supply device discharges solid ammonia; when the temperature in the second exhaust pipe 12 is greater than or equal to a second preset temperature value, the second supply device sprays the urea aqueous solution.
Specifically, the first preset temperature value is 150 ℃, and the second preset temperature value is 180 ℃. The temperature value is not limited to the above value, and may be set as needed.
In some embodiments, the present invention discloses that the oxidation catalyst 1 is a close-coupled oxidation catalyst 1, which can be arranged directly on the engine by volume limitation by using a low heat capacity carrier, and the conversion efficiency of NO2 at low temperature is improved.
In some embodiments, the invention discloses that the front area of the particle trap 3 is coated with a precious metal catalyst layer, increasing the adsorption surface area.
The particulate trap 3 integrates the oxidation catalyst 1, and the particulate trap 3 has both HC light-off characteristics and oxidation characteristics of the oxidation catalyst 1 and particulate matter trapping and regeneration characteristics of the particulate trap 3 by coating a precious metal catalyst material on a carrier of the particulate trap 3. Through the integration of the two functions, the volume space and the heat capacity required by the post-treatment can be effectively reduced, and the overall temperature of the post-treatment is improved. The front area of the DDPF is coated with a noble metal catalyst of a molecular sieve type,
in some embodiments, the aftertreatment system further includes a third temperature sensor 9, a first nitrogen oxide detection sensor 10, and a second nitrogen oxide detection sensor 14, the discharge port of the selective oxidation catalyst 4 is conductively connected with a third exhaust pipe 13, the third temperature sensor 9 is mounted on the third exhaust pipe 13, and a probe of the third temperature sensor 9 extends into the third exhaust pipe 13 for detecting the temperature of the exhaust gas in the third exhaust pipe 13.
The first nitrogen-oxygen detection sensor 10 is mounted on the third exhaust pipe 13, and a probe of the nitrogen-oxygen sensor extends into the third exhaust pipe 13 for detecting a content value of nitrogen oxide in the third exhaust pipe 13.
The second nitrogen oxide detecting sensor 14 is installed on the first exhaust pipe 11, and a probe of the second nitrogen oxide detecting sensor 14 extends into the first exhaust pipe 11 for detecting a content value of nitrogen oxide in the first exhaust pipe 11.
Another aspect of the present invention provides a post-processing system control method, including the steps of:
step S1: it is determined whether the temperature between the inlet of the particulate trap 3 and the outlet of the turbocharger 2 is within the low temperature range, if so, the process goes to step S2, and if not, the process goes to step S3.
In particular, the temperature between the outlet of the particle trap 3 and the inlet of the turbocharger 2 is detected by means of a first temperature sensor.
Step S2: solid ammonia is sprayed between the particle trap 3 and the turbocharger 2 to react the solid ammonia with nitrogen dioxide to produce solid ammonium nitrate.
Specifically, solid ammonium nitrate is attached to the particle catcher 3.
Step S3: and judging whether the temperature between the inlet of the particle catcher 3 and the outlet of the turbocharger 2 is higher than the maximum temperature value of the low-temperature interval or not, if so, stopping spraying the solid ammonia between the particle catcher 3 and the turbocharger 2, and spraying the solid ammonia or the urea aqueous solution between the particle catcher 3 and the selective oxidation catalyst 4 to oxidize the nitrogen oxide.
According to the aftertreatment system disclosed by the invention, when the temperature between the turbocharger 2 and the particle trap 3 is in a low-temperature range, solid ammonia is provided for the first exhaust pipe 11 communicated between the turbocharger 2 and the particle trap 3, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate which is attached to the particle trap 3, so that the conversion efficiency of nitrogen oxide at low temperature is improved. When the temperature between the turbocharger 2 and the particle catcher 3 is higher than the highest temperature value of the low-temperature section, the supply of the solid ammonia to the first exhaust pipe 11 is stopped, and the solid ammonia or the urea water solution is sprayed between the particle catcher 3 and the selective oxidation catalyst 4 to oxidize the nitrogen oxide, so that the emission of the nitrogen oxide in the exhaust gas is reduced.
The terms "first", "second", and the like in the present invention are used for descriptive distinction and have no other special meaning.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.
Claims (10)
1. An aftertreatment system comprising an oxidation catalyst, a turbocharger, a particulate trap, and a selective oxidation catalyst;
the oxidation catalyst, the turbocharger, the particulate trap and the selective oxidation catalyst are sequentially connected in series and conducted along the exhaust gas discharge direction;
the turbocharger is in conduction connection with the particle trap through a first exhaust pipe, and the first exhaust pipe is in conduction connection with a first supply device for providing solid ammonia;
the particle catcher is in conduction connection with the selective oxidation catalyst through a second exhaust pipe, and the second exhaust pipe is in conduction connection with a second supply device for supplying solid ammonia or urea water solution;
when the temperature in the first exhaust pipe is in a low-temperature range, the first supply device provides solid ammonia for the first exhaust pipe, and the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate;
when the temperature in the first exhaust pipe is higher than the highest temperature value of the low-temperature section, the first supply device stops supplying solid ammonia to the first exhaust pipe, and the second supply device supplies solid ammonia or urea water solution to the second exhaust pipe to oxidize nitrogen oxides.
2. The aftertreatment system of claim 1, wherein the low temperature zone ranges in value from greater than or equal to 150 ℃ and less than or equal to 200 ℃.
3. The aftertreatment system of claim 1, further comprising a first nozzle;
the first nozzle is installed at a discharge port of the first supply device and is in conduction connection with the first exhaust pipe.
4. The aftertreatment system of claim 3, further comprising a second nozzle;
the second nozzle is installed at the discharge port of the second supply device and is in conduction connection with the second exhaust pipe.
5. The aftertreatment system of claim 1, further comprising a first temperature sensor;
the first temperature sensor is installed on the first exhaust pipe, and a probe of the first temperature sensor extends into the first exhaust pipe and is used for detecting the temperature in the first exhaust pipe.
6. The aftertreatment system of claim 5, further comprising a second temperature sensor;
the second temperature sensor is installed on the second exhaust pipe, and a probe of the second temperature sensor extends into the second exhaust pipe and is used for detecting the temperature in the second exhaust pipe.
7. The aftertreatment system of any one of claims 1-6, wherein the second supply device emits ammonia in solid form when the temperature in the second exhaust pipe is greater than or equal to a first predetermined temperature value and less than a second predetermined temperature value;
and when the temperature in the second exhaust pipe is greater than or equal to the second preset temperature value, the second supply device sprays urea aqueous solution.
8. The aftertreatment system of claim 7, wherein the first preset temperature value is 150 ℃ and the second preset temperature value is 180 ℃.
9. The aftertreatment system of claim 5, wherein the oxidation catalyst is a close-coupled oxidation catalyst;
and/or
The front area of the particle catcher is coated with a noble metal catalyst layer;
and/or
The aftertreatment system further comprises a third temperature sensor, a first nitrogen and oxygen detection sensor and a second nitrogen and oxygen detection sensor, a third exhaust pipe is connected to a discharge port of the selective oxidation catalyst in a conduction mode, the third temperature sensor is installed on the third exhaust pipe, a probe of the third temperature sensor extends into the third exhaust pipe and is used for detecting the temperature in the third exhaust pipe,
the first nitrogen and oxygen detection sensor is arranged on the third exhaust pipe, and a probe of the nitrogen and oxygen sensor extends into the third exhaust pipe and is used for detecting nitrogen oxides in the third exhaust pipe,
the second nitrogen oxide detection sensor is installed on the first exhaust pipe, and a probe of the second nitrogen oxide detection sensor extends into the first exhaust pipe and is used for detecting nitrogen oxides in the first exhaust pipe.
10. An aftertreatment system control method, comprising:
step S1: judging whether the temperature between the inlet of the particle catcher and the outlet of the turbocharger is in a low-temperature range, if so, turning to the step S2, and if not, turning to the step S3;
step S2: spraying solid ammonia between the particle catcher and the turbocharger so that the solid ammonia reacts with nitrogen dioxide to generate solid ammonium nitrate;
step S3: and judging whether the temperature between the inlet of the particle trap and the outlet of the turbocharger is greater than the maximum temperature value of the low-temperature interval or not, if so, stopping spraying solid ammonia between the particle trap and the turbocharger, and spraying solid ammonia or urea aqueous solution between the particle trap and the selective oxidation catalyst to oxidize nitrogen oxide.
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| CN202011240020.8A CN112343700B (en) | 2020-11-09 | 2020-11-09 | Post-processing system and control method |
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| CN202011240020.8A CN112343700B (en) | 2020-11-09 | 2020-11-09 | Post-processing system and control method |
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| CN112343700B CN112343700B (en) | 2022-04-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140250866A1 (en) * | 2013-03-07 | 2014-09-11 | Cummins Ip, Inc. | Solid Ammonia Delivery System |
| CN207761768U (en) * | 2017-12-25 | 2018-08-24 | 潍柴动力股份有限公司 | A kind of after-treatment system of engine exhaust |
| CN109306894A (en) * | 2018-09-27 | 2019-02-05 | 潍柴动力股份有限公司 | A kind of exhaust treatment system and method |
| US20190316506A1 (en) * | 2018-04-12 | 2019-10-17 | Ai Alpine Us Bidco Inc | Exhaust aftertreatment system |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140250866A1 (en) * | 2013-03-07 | 2014-09-11 | Cummins Ip, Inc. | Solid Ammonia Delivery System |
| CN207761768U (en) * | 2017-12-25 | 2018-08-24 | 潍柴动力股份有限公司 | A kind of after-treatment system of engine exhaust |
| US20190316506A1 (en) * | 2018-04-12 | 2019-10-17 | Ai Alpine Us Bidco Inc | Exhaust aftertreatment system |
| CN109306894A (en) * | 2018-09-27 | 2019-02-05 | 潍柴动力股份有限公司 | A kind of exhaust treatment system and method |
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