CN117145619A - Tail gas treatment system and method and vehicle - Google Patents
Tail gas treatment system and method and vehicle Download PDFInfo
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- CN117145619A CN117145619A CN202310896622.6A CN202310896622A CN117145619A CN 117145619 A CN117145619 A CN 117145619A CN 202310896622 A CN202310896622 A CN 202310896622A CN 117145619 A CN117145619 A CN 117145619A
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- Prior art keywords
- engine
- catalyst
- exhaust gas
- adsorption carrier
- gas treatment
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Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 119
- 238000001179 sorption measurement Methods 0.000 claims abstract description 84
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 26
- 231100000719 pollutant Toxicity 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims description 82
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 37
- 229930195733 hydrocarbon Natural products 0.000 claims description 18
- 150000002430 hydrocarbons Chemical class 0.000 claims description 18
- 239000004215 Carbon black (E152) Substances 0.000 claims description 9
- 239000003463 adsorbent Substances 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0835—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
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—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
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
-
- 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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/11—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hybrid vehicles
Abstract
The invention provides an exhaust gas treatment system, an exhaust gas treatment method and a vehicle, and relates to the technical field of vehicles. The tail gas treatment system comprises a primary catalyst, an adsorption carrier, a heating device and a secondary catalyst, wherein one end of the primary catalyst is used for being connected with an engine, the other end of the primary catalyst is sequentially provided with the adsorption carrier and the secondary catalyst, the heating device is used for heating the secondary catalyst, and the primary catalyst is connected with the adsorption carrier through an exhaust pipe with a preset length so as to enable the adsorption carrier to work in a preset temperature range. The invention can ensure that the adsorption carrier works within a preset temperature range, so that pollutants in the tail gas can be effectively adsorbed, and meanwhile, the pollutants released after the adsorption carrier is adsorbed can be converted through the secondary catalyst when the primary catalyst does not work, so that the pollutant components in the tail gas are reduced, and the near zero emission is realized.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an exhaust gas treatment system and method and a vehicle.
Background
In order to cope with the increasingly serious environmental pollution, the emission standard of the tail gas of the vehicle is gradually increased so as to reduce the amount of harmful gases such as carbon monoxide, hydrocarbon, nitrogen oxide and the like in the tail gas of the vehicle, thereby reducing the pollution degree of the tail gas of the vehicle to the air.
In order to meet the emission standard of the existing vehicle tail gas, the existing tail gas emission system generally adopts a primary catalyst to convert harmful gas into carbon dioxide, nitrogen, water vapor and the like, and a corresponding adsorption carrier is arranged to adsorb pollutants, however, the adsorption carrier is generally arranged at the outlet position of the primary catalyst, so that the service life of the adsorption carrier is seriously influenced due to high temperature, thereby influencing the tail gas treatment effect, and the near zero emission cannot be realized.
Disclosure of Invention
The invention solves the problem of realizing near zero emission.
In order to solve the problems, the invention provides an exhaust gas treatment system, an exhaust gas treatment method and a vehicle.
In a first aspect, the present invention provides an exhaust gas treatment system, including a primary catalyst, an adsorption carrier, a heating device, and a secondary catalyst, where one end of the primary catalyst is connected to an engine, the other end of the primary catalyst is sequentially provided with the adsorption carrier and the secondary catalyst, the heating device is used for heating the secondary catalyst, and the primary catalyst and the adsorption carrier are connected through an exhaust pipe with a preset length, so that the adsorption carrier works in a preset temperature range.
Optionally, the adsorption carrier includes a first adsorption carrier and a second adsorption carrier, where the first adsorption carrier is used for adsorbing and releasing hydrocarbons in the exhaust gas, and the second adsorption carrier is used for adsorbing and releasing nitrogen oxide compounds in the exhaust gas.
Optionally, the preset temperature range includes a first preset temperature range and a second preset temperature range, when the adsorption carrier operates in the first preset temperature range, the first adsorption carrier adsorbs the hydrocarbon, the second adsorption carrier adsorbs the oxynitride, when the adsorption carrier operates in the second preset temperature range, the first adsorption carrier releases the hydrocarbon, and the second adsorption carrier releases the oxynitride, wherein the first preset temperature range is smaller than the second preset temperature range.
Optionally, the exhaust gas treatment system further comprises an air pump device, the air pump device is connected with the heating device, and the heating device performs convection heating on the secondary catalyst through the air pump device.
Optionally, the exhaust gas treatment system further comprises an auxiliary heating device, the auxiliary heating device is arranged between the primary catalyst and the engine, and the auxiliary heating device is used for heating the primary catalyst.
In a second aspect, the present invention provides a method for treating exhaust gas, which is applied to the exhaust gas treatment system, and includes:
before the engine is started in a cold mode, a heating device is controlled to heat the secondary catalyst so that the secondary catalyst reaches a required working temperature;
when the engine is in a cold start stage, adsorbing pollutants in tail gas through an adsorption carrier;
when the engine is in a warm-up stage, the adsorption carrier releases adsorbed pollutants, and the secondary catalyst is controlled to convert the released pollutants;
when the engine is in a heat engine stage, the first-stage catalyst is controlled to convert pollutants in the tail gas.
Optionally, the exhaust gas treatment method further includes:
determining the heat required for heating according to the working temperature required by the secondary catalyst;
and determining the heating time of the heating device according to the heat and the power of the heating device.
Optionally, the exhaust gas treatment method further includes:
controlling the P1 motor to start so as to drive a crankshaft of the engine to rotate;
and controlling the P1 motor to drive the engine to run in a fuel cut-off mode until the fuel supply is started.
Optionally, the exhaust gas treatment method further includes:
determining engine flow according to the displacement of the engine, the reverse towing speed of the engine and the charging efficiency of the engine;
determining a required heat flow rate of the secondary catalyst based on a convective heat transfer coefficient of the secondary catalyst, a surface area of the secondary catalyst, a required operating temperature of the secondary catalyst, and an airflow temperature of the engine;
and determining the reverse towing time of the engine according to the engine flow and the heat flow.
In a third aspect, the present invention provides a vehicle comprising the exhaust gas treatment system described above, or comprising a memory, a processor and a computer program stored in the memory and operable on the processor, the processor implementing the exhaust gas treatment method as described above when executing the computer program.
The invention is provided with the first-stage catalyst and the adsorption carrier which are connected through the exhaust pipe with the preset length, so that the adsorption carrier can work in the preset temperature range, thereby effectively adsorbing pollutants in tail gas (for example in a cold start stage), simultaneously heating the second-stage catalyst through the heating device, enabling the second-stage catalyst to reach the required working temperature before the engine is started, and further converting the pollutants released after the adsorption carrier is adsorbed (released in a warm-up stage) through the second-stage catalyst when the first-stage catalyst is not working (i.e. does not enter a heat engine stage), thereby effectively reducing the pollutant components in the tail gas and further realizing near zero emission.
Drawings
FIG. 1 is a schematic diagram of an exhaust treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exhaust treatment system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of an exhaust treatment method according to an embodiment of the invention;
FIG. 4 is a schematic illustration of an exhaust treatment system according to an embodiment of the present invention;
fig. 5 is a schematic diagram showing temperature rise comparison between a thermal convection mode and a thermal radiation mode according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1, an embodiment of the present invention provides an exhaust gas treatment system, including a primary catalyst, an adsorption carrier, a heating device, and a secondary catalyst, where one end of the primary catalyst is used to connect with an engine, the other end of the primary catalyst is sequentially provided with the adsorption carrier and the secondary catalyst, the heating device is used to heat the secondary catalyst, and the primary catalyst and the adsorption carrier are connected through an exhaust pipe with a preset length, so that the adsorption carrier works in a preset temperature range.
Specifically, the exhaust gas treatment system comprises a first-stage catalyst, an adsorption carrier, a heating device and a second-stage catalyst, wherein one end of the first-stage catalyst is used for being connected with an engine, the first-stage catalyst can be a three-way catalyst, the main function of the first-stage catalyst is to reduce carbon monoxide (CO), nitrogen oxides (NOx) and some partial Volatile Organic Compounds (VOCs) in the exhaust gas, the harmful substances are converted into harmless substances such as carbon dioxide (CO 2), nitrogen (N2) and water vapor (H2O) through catalysts such as platinum, palladium and rhodium, the other end of the first-stage catalyst is connected with the adsorption carrier, the durable service life of the adsorption carrier is seriously reduced after the temperature of the adsorption carrier exceeds a preset temperature (for example, 600 ℃), and therefore, the first-stage catalyst and the adsorption carrier are connected through an exhaust pipe with a preset length, so that the high temperature (generally above 800 ℃) of an outlet of the first-stage catalyst can not directly cause the adsorption carrier to influence the service life of the adsorption carrier under the influence of the high temperature, the adsorption carrier can work within a temperature range after the exhaust pipe is passed, and pollutants (for example, hydrocarbon gas and nitrogen and oxygen) in the exhaust gas can be effectively adsorbed in a range, the environment with the temperature range of which the pollution in the exhaust gas (for example, such as carbon hydrogen and nitrogen and oxygen) can be more than the pollutant in the exhaust gas can be more than about 35 mg/zero emission, and the light emission of the vehicle and the environment is less than about 1 mg/less than zero, and the requirements of the national standard and zero/or zero emission can be less than 1 mg.
The exhaust pipe between the first-stage catalyst and the adsorption carrier is generally referred to as a middle-stage exhaust pipe, the engine conveys the tail gas to the first-stage catalyst through an exhaust manifold and a front exhaust pipe, the first-stage catalyst conveys the tail gas to the adsorption carrier through the middle-stage exhaust pipe, and the second-stage catalyst conveys the tail gas to the tail of the vehicle through a rear exhaust pipe for emission.
Wherein, the tail gas treatment system can work according to the following principle:
(1) When the vehicle speed is lower, the whole vehicle directly drives the vehicle to run through the power battery, the engine is not started, no tail gas is generated, and the tail gas treatment system does not work (the heating device can be started in advance).
(2) When the vehicle speed is at a medium-high speed or the State of Charge (SOC) is low, the engine is started under the drive of the P1 motor.
(3) After the engine is cold started, the generated tail gas is discharged through the tail gas treatment system. At this time, the engine and the exhaust emission system (except the secondary catalyst) are in a low temperature state, and the normal working temperature is not reached yet, but the secondary catalyst can work normally, and generally before the engine is started, the secondary catalyst reaches the required working temperature (for example, 500 ℃), so that the conversion efficiency of the secondary catalyst is higher.
(4) The adsorption carrier can normally work in a preset temperature range, and when the adsorption carrier works in a first preset temperature range (for example, below 200 ℃), the adsorption carrier adsorbs pollutants (at the moment, the adsorption carrier is generally in a cold start stage), and when the adsorption carrier works in a second preset temperature range (for example, 200 ℃ to 600 ℃), the adsorption carrier releases pollutants (at the moment, the adsorption carrier is generally in a warm-up stage), and the adsorption carrier is converted by the secondary catalyst and then discharges tail gas meeting the standard.
(5) As the engine and exhaust emission system reach normal operating temperatures and remain stable (which is typically the case in the heat engine stage), the primary catalyst reaches the desired operating temperature, at which time conversion of pollutants may be performed by the primary catalyst.
Optionally, the adsorption carrier includes a first adsorption carrier and a second adsorption carrier, where the first adsorption carrier is used for adsorbing and releasing hydrocarbons in the exhaust gas, and the second adsorption carrier is used for adsorbing and releasing nitrogen oxide compounds in the exhaust gas.
Specifically, the adsorption carriers include a first adsorption carrier and a second adsorption carrier, the first adsorption carrier is also called HC Trap (hydrocarbon adsorber), the HC Trap is an adsorber for adsorbing Hydrocarbons (HC) in the exhaust gas, and the HC Trap adsorbs Hydrocarbons in the exhaust gas by using a specific molecular sieve (there is a small amount of oxidation reaction); the second adsorption carrier is also called NOx Trap (nitrogen oxide adsorber), which is an adsorber for adsorbing nitrogen oxides (NOx) in the exhaust gas, and the NOx Trap adsorbs hydrocarbons in the exhaust gas by using a special molecular sieve (there is a small amount of oxidation reaction).
Optionally, the preset temperature range includes a first preset temperature range and a second preset temperature range, when the adsorption carrier operates in the first preset temperature range, the first adsorption carrier adsorbs the hydrocarbon, the second adsorption carrier adsorbs the oxynitride, when the adsorption carrier operates in the second preset temperature range, the first adsorption carrier releases the hydrocarbon, and the second adsorption carrier releases the oxynitride, wherein the first preset temperature range is smaller than the second preset temperature range.
Specifically, the preset temperature ranges include a first preset temperature range (for example, 200 ℃ or lower) and a second preset temperature range (for example, 200 ℃ to 600 ℃), the first adsorption carrier adsorbs hydrocarbons when operating in the first preset temperature range (for example, 200 ℃ or lower), the second adsorption carrier adsorbs nitrogen oxides (at this time, generally in a cold start stage), and the first adsorption carrier releases hydrocarbons when operating in the second preset temperature range (for example, 200 ℃ to 600 ℃) and the second adsorption carrier releases nitrogen oxides (at this time, generally in a warm-up stage), and the standard off-gas is discharged after conversion by the secondary catalyst.
Optionally, the exhaust gas treatment system further comprises an air pump device, the air pump device is connected with the heating device, and the heating device performs convection heating on the secondary catalyst through the air pump device.
Specifically, as shown in connection with fig. 2, the exhaust gas treatment system further includes an air pump device, which is connected to the heating device, and can provide an air source for thermal convection heating, so that the heating device can perform convection heating on the secondary catalyst; wherein, other modes besides the air pump device can be adopted to realize heat convection heating.
With reference to fig. 5 (from top to bottom, three groups of lines are sequentially the catalyst temperature, the engine speed and the electric heating zone bit), under the same electric heating time, the secondary catalyst is heated by a thermal convection mode, the temperature of the secondary catalyst is greater than 500 ℃ when the engine is started, the temperature of the secondary catalyst is less than 100 ℃ when the engine is started by adopting a heating mode of thermal radiation, and although the temperature can be quickly increased after the engine is started, the conversion efficiency in a cold start stage is lower than that of the catalyst heated by the thermal convection mode, and more harmful gas can be discharged.
Optionally, the exhaust gas treatment system further comprises an auxiliary heating device, the auxiliary heating device is arranged between the primary catalyst and the engine, and the auxiliary heating device is used for heating the primary catalyst.
Specifically, as shown in fig. 2, the exhaust gas treatment system further includes an auxiliary heating device, that is, the auxiliary heating device is added before the primary catalyst, so that the temperature rise rate of the primary catalyst can be increased, and the primary catalyst can quickly enter a high-efficiency working area.
Referring to fig. 3, another embodiment of the present invention provides an exhaust gas treatment method, which is applied to the exhaust gas treatment system, including:
before the engine is started in a cold mode, the heating device is controlled to heat the secondary catalyst so that the secondary catalyst reaches a required working temperature.
Specifically, as shown in connection with FIG. 4, the heating device is started in advance to heat the secondary catalyst before the engine is cold started, and the secondary catalyst has reached a desired operating temperature (e.g., 500℃.) before the engine is started.
In fig. 4, from top to bottom, a first curve represents a vehicle speed, a second curve represents a flag bit (1 represents start, 0 represents no start) of electric heating start, t3 represents a heating device start time, a third curve represents an engine speed curve, t2 represents a P1 motor reverse traction time, t3 represents an engine start time, and a fourth curve represents a temperature curve of a secondary catalyst, and it can be seen that at the engine start time t1, the temperature of the secondary catalyst is already greater than 500 ℃; in addition, to ensure that the secondary catalyst is fully heated, a period of time (e.g., 10 s) is typically reserved when the heating device is turned on and the P1 motor is reversed.
And when the engine is in a cold start stage, adsorbing pollutants in the tail gas through an adsorption carrier.
Specifically, when the engine is in a cold start phase, the adsorbent carrier is typically within a first preset temperature range (e.g., below 200 ℃) where the adsorbent carrier adsorbs contaminants.
When the engine is in a warm-up stage, the adsorption carrier releases the adsorbed pollutants, and the secondary catalyst is controlled to convert the released pollutants.
Specifically, when the engine is in the warm-up stage, the adsorption carrier is generally in a second preset temperature range (for example, 200 ℃ to 600 ℃), and at this time, the adsorption carrier releases pollutants, and the pollutants are converted by the secondary catalyst and then the exhaust gas meeting the standard is discharged; during the warm-up phase, the temperature of the secondary catalyst is maintained above 500 ℃.
When the engine is in a heat engine stage, the first-stage catalyst is controlled to convert pollutants in the tail gas.
Specifically, when the engine is in the heat engine stage, the primary catalyst reaches a desired operating temperature (e.g., 500 ℃) at which time a conversion of contaminants may be performed by the primary catalyst.
Optionally, the exhaust gas treatment method further includes:
the amount of heat required for heating is determined based on the desired operating temperature of the secondary catalyst.
Specifically, the calculation formula of the specific heat capacity is expressed as: q=cm Δt, where Q represents the heat required for heating, c represents the specific heat capacity, m represents the mass, Δt represents the temperature difference, and the heat required for heating the secondary catalyst to 500 ℃ can be calculated from this formula.
And determining the heating time of the heating device according to the heat and the power of the heating device.
Specifically, since the heat required by the heating of the secondary catalyst is from the heating device, the heating time of the heating device can be determined according to the power provided by the heating device; considering partial loss such as heat radiation, it is necessary to multiply a certain coefficient by a certain time, and it is generally about 1.1 to 1.2.
Optionally, the exhaust gas treatment method further includes:
and controlling the P1 motor to start so as to drive the crankshaft of the engine to rotate.
Specifically, as shown in connection with fig. 2, in the hybrid system, an electric motor (typically, a P1 motor) transmits an output torque of the electric motor to a crankshaft of the engine to start the internal combustion engine, and the P1 motor is started to enable a crankshaft rotation speed of the engine to reach a rotation speed at which the engine is fed with oil.
And controlling the P1 motor to drive the engine to run in a fuel cut-off mode until the fuel supply is started.
Specifically, referring to fig. 4, where the start time of the P1 motor is time t2, t1 represents the engine start time, i.e., t1 is the engine fueling time. In the hybrid power system, the time period from the time t2 to the time t1 is longer than the time period when the crankshaft of the normal engine reaches the engine starting speed, the engine idles to form air convection, and the secondary catalyst is enhanced to form convection heat transfer.
The starting time of the engine can be determined according to the ambient temperature, the vehicle speed, the battery SOC, the heating requirement of the catalyst, the idle speed of the engine, the whole vehicle control strategy and the like.
Optionally, the exhaust gas treatment method further includes:
and determining the engine flow according to the displacement of the engine, the reverse towing rotating speed of the engine and the charging efficiency of the engine.
Specifically, the rotational speed calculation flow rate of the engine is expressed as: q=vd×ns×ve/K, where Vd denotes the displacement of the engine, ns denotes the rotational speed of the engine, that is, the reverse rotation speed, ve denotes the charge efficiency (determined according to parameters such as the shape and length of the intake pipe of the engine), K denotes a constant, and K is 2000 in the case of a four-stroke engine.
The heat flow rate required by the secondary catalyst is determined based on the convective heat transfer coefficient of the secondary catalyst, the surface area of the secondary catalyst, the desired operating temperature of the secondary catalyst, and the air flow temperature of the engine. Because the P1 motor drives the engine to run for a period of time (engine air intake), the convection heat transfer coefficient is improved.
Specifically, the thermal convection formula is expressed as: the required heat flow = convective heat transfer coefficient =surface area of the catalyst (temperature of the catalyst-temperature of the engine airflow), wherein the convective heat transfer coefficient refers to the convective heat transfer rate when the secondary catalyst performs convective heating through the heating device, can reflect the speed of convective heat transfer, and can be obtained through experiments, and the coefficients are different at different temperatures.
And determining the reverse towing time of the engine according to the engine flow and the heat flow.
Specifically, since the engine speed is fixed, the flow rate of the default engine is consistent, so that the reverse towing time t=required heat flow rate/flow rate of the engine per second, and a certain coefficient is multiplied by the calculated time in consideration of partial loss such as heat radiation, and generally about 1.1-1.2 is taken; taking the engine reverse-dragging rotation speed 900r/min as an example, the reverse-dragging time is 42s (for example, 180s from 138s at time t2 to t1 in fig. 4).
Another embodiment of the present invention provides a vehicle comprising the exhaust gas treatment system described above, or comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the exhaust gas treatment method as described above when executing the computer program.
Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. The utility model provides a tail gas treatment system, its characterized in that includes one-level catalyst converter, adsorption carrier, heating device and second grade catalyst converter, one end of one-level catalyst converter is used for being connected with the engine, the other end of one-level catalyst converter has set gradually adsorption carrier with the second grade catalyst converter, heating device is used for to the second grade catalyst converter heats, one-level catalyst converter with connect through the blast pipe of predetermineeing the length between the adsorption carrier, so that the adsorption carrier is at predetermineeing the temperature range work.
2. The exhaust gas treatment system of claim 1, wherein the adsorption carrier comprises a first adsorption carrier for adsorbing and releasing hydrocarbons in the exhaust gas and a second adsorption carrier for adsorbing and releasing nitrogen oxides in the exhaust gas.
3. The exhaust gas treatment system of claim 2, wherein the predetermined temperature range comprises a first predetermined temperature range and a second predetermined temperature range, the first adsorbent carrier adsorbing the hydrocarbon when the adsorbent carrier is operating within the first predetermined temperature range, the second adsorbent carrier adsorbing the nitrogen oxide, the first adsorbent carrier releasing the hydrocarbon when the adsorbent carrier is operating within the second predetermined temperature range, the second adsorbent carrier releasing the nitrogen oxide, wherein the first predetermined temperature range is less than the second predetermined temperature range.
4. The exhaust gas treatment system of claim 1, further comprising an air pump device coupled to the heating device, the heating device convectively heating the secondary catalyst via the air pump device.
5. The exhaust gas treatment system of claim 1, further comprising an auxiliary heating device disposed between the primary catalyst and the engine, the auxiliary heating device configured to heat the primary catalyst.
6. A method of treating exhaust gas applied to the exhaust gas treatment system according to any one of claims 1 to 5, comprising:
before the engine is started in a cold mode, a heating device is controlled to heat the secondary catalyst so that the secondary catalyst reaches a required working temperature;
when the engine is in a cold start stage, adsorbing pollutants in tail gas through an adsorption carrier;
when the engine is in a warm-up stage, the adsorption carrier releases adsorbed pollutants, and the secondary catalyst is controlled to convert the released pollutants;
when the engine is in a heat engine stage, the first-stage catalyst is controlled to convert pollutants in the tail gas.
7. The exhaust gas treatment method according to claim 6, characterized by further comprising:
determining the heat required for heating according to the working temperature required by the secondary catalyst;
and determining the heating time of the heating device according to the heat and the power of the heating device.
8. The exhaust gas treatment method according to claim 6, characterized by further comprising:
controlling the P1 motor to start so as to drive a crankshaft of the engine to rotate;
and controlling the P1 motor to drive the engine to run in a fuel cut-off mode until the fuel supply is started.
9. The exhaust gas treatment method according to claim 8, characterized by further comprising:
determining engine flow according to the displacement of the engine, the reverse towing speed of the engine and the charging efficiency of the engine;
determining a required heat flow rate of the secondary catalyst based on a convective heat transfer coefficient of the secondary catalyst, a surface area of the secondary catalyst, a required operating temperature of the secondary catalyst, and an airflow temperature of the engine;
and determining the reverse towing time of the engine according to the engine flow and the heat flow.
10. A vehicle comprising the exhaust gas treatment system of any one of claims 1 to 5, or comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the exhaust gas treatment method of any one of claims 6 to 9 when executing the computer program.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310896622.6A CN117145619A (en) | 2023-07-20 | 2023-07-20 | Tail gas treatment system and method and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310896622.6A CN117145619A (en) | 2023-07-20 | 2023-07-20 | Tail gas treatment system and method and vehicle |
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| CN202310896622.6A Pending CN117145619A (en) | 2023-07-20 | 2023-07-20 | Tail gas treatment system and method and vehicle |
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