CN114109569B - Exhaust purification apparatus and method for preventing non-restorability after sulfur poisoning of LNT region - Google Patents
Exhaust purification apparatus and method for preventing non-restorability after sulfur poisoning of LNT region Download PDFInfo
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- CN114109569B CN114109569B CN202010902340.9A CN202010902340A CN114109569B CN 114109569 B CN114109569 B CN 114109569B CN 202010902340 A CN202010902340 A CN 202010902340A CN 114109569 B CN114109569 B CN 114109569B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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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- 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
- Y02T10/40—Engine management systems
Abstract
The present invention provides an exhaust gas purification apparatus and a method of preventing non-restorability after sulfur poisoning of an LNT region, the exhaust gas purification apparatus including: an LNT region that is provided in an exhaust passage of the exhaust purification device and that is provided adjacent to an exhaust inlet side of the exhaust passage, and a cooling device; the cooling device is disposed between the LNT region and the exhaust inlet, and when the temperature inside the LNT region is greater than 650 ℃, the cooling device may cool the LNT region to control the temperature inside the LNT region to be less than 650 ℃. According to the exhaust purification device of the invention, the LNT region has better capability of treating nitrogen oxides in exhaust, and can better meet the national standard requirements of exhaust emission.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an exhaust purification device and a method for preventing LNT (low-fuel-limit) region from being incapable of recovering after sulfur poisoning.
Background
In the current Light diesel vehicle (LDD) emissions legislation, it can be seen that upgrading from country 5 (CN v) to country 6b (CN vib) reduces NOx emissions by 82.1%, with NOx emissions showing a more stringent trend.
In the prior art, when BaO in LNT (Lean NOx Trap) region of an exhaust gas purification device of a diesel engine is SO-substituted 2 Reaction to produce BaSO 4 Later, when the working condition that the temperature exceeds 650 ℃ is met, baSO can be caused 4 Agglomeration occurs, baSO 4 The consequence of agglomeration is BaSO 4 Inability to reduce to BaO, resulting in NO storage in the LNT region 2 And release of NO 2 The capacity is reduced, even the function in the aspect is lost, and finally the emission of the whole vehicle can not meet the requirement of the regulation. Therefore, there is room for improvement in the exhaust gas purification device in the related art.
Disclosure of Invention
In view of the above, a first objective of the present invention is to provide an exhaust gas purification device, which has better capability of treating nitrogen oxides in exhaust gas in LNT (Lean NOx Trap) region, and can better meet the national standard requirement of exhaust emission.
It is a second object of the present invention to provide a method for preventing the inability to recover after sulfur poisoning of the LNT region.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an exhaust gas purification device comprising: an LNT region that is provided in an exhaust passage of the exhaust purification device and that is provided adjacent to an exhaust inlet side of the exhaust passage, and a cooling device; the cooling device is disposed between the LNT region and the exhaust inlet, and when the temperature inside the LNT region is greater than 650 ℃, the cooling device may cool the LNT region to control the temperature inside the LNT region to be less than 650 ℃.
According to the exhaust gas purification apparatus of the embodiment of the present invention, the cooling apparatus includes:
a water tank containing a cooling liquid therein;
and a nozzle disposed on the exhaust passage and between the LNT region and the exhaust inlet, the nozzle spraying the coolant onto the LNT region, the nozzle and the water tank being communicated by a connection hose.
According to the exhaust purification apparatus of the embodiment of the present invention, the nozzle hole diameters of the nozzles include a plurality of nozzle hole diameters, and the plurality of nozzle hole diameters correspond to the preset temperatures to be cooled in the LNT region, respectively.
According to the exhaust gas purification apparatus of the embodiment of the present invention, the nozzle has a diameter D and satisfies: d is more than or equal to 0.1mm and less than or equal to 0.7mm.
According to the exhaust gas purification apparatus of the embodiment of the present invention, the cooling apparatus further includes: a supply pump provided within the water tank to supply the cooling liquid to the nozzle.
According to the exhaust gas purification device of the embodiment of the present invention, the pump pressure in the water tank is F, and the following conditions are satisfied: f is more than or equal to 5bar and less than or equal to 7bar.
The exhaust gas purification device according to the embodiment of the present invention, further includes: and the vehicle-mounted control unit is used for controlling the nozzle to spray cooling liquid into the LNT area when the temperature in the LNT area is higher than 650 ℃ and the excess air coefficient in the LNT area is higher than 1.2.
The exhaust gas purification device according to the embodiment of the present invention, further includes:
a DPF (Diesel Particulate Filter) region;
a Selective Catalytic Reduction (SCR) region disposed between the LNT region and the SCR region, and purifying vehicle exhaust entering the exhaust passage from the exhaust inlet through the LNT region, the DPF region, and the SCR region in this order;
and a plurality of sensors that are provided upstream of the LNT region, the DPF region, and the SCR region in this order in a flow direction of exhaust gas in the exhaust passage, and that detect temperatures and oxygen contents of the LNT region, the DPF region, and the SCR region, respectively.
Compared with the prior art, the LNT area of the exhaust purification device has better capability of treating nitrogen oxides in exhaust, and can better meet the national standard requirement of exhaust emission.
A method of preventing unrecoverable LNT region after sulfur poisoning according to a second aspect of the present invention comprises the steps of:
s1, vehicle tail gas enters an exhaust channel through an exhaust inlet, a high-temperature sensor detects that the temperature in an LNT area is higher than 650 ℃, and an oxygen sensor detects that the excess air coefficient in the LNT area is higher than 1.2;
s2, the high-temperature sensor and the oxygen sensor transmit detection information to the vehicle-mounted control unit;
s3, the vehicle-mounted control unit sends out an instruction to control the cooling device to spray cooling liquid into the LNT area, meanwhile, the high-temperature sensor continues to detect the temperature of the LNT area, and the oxygen sensor continues to detect the excess air coefficient of the LNT area;
and S4, when the temperature detected by the high-temperature sensor in the LNT area is not more than 650 ℃ and the excess air factor detected by the oxygen sensor is not more than 1.2, sending a command again by the vehicle-mounted control unit, and controlling the cooling device to stop injecting the cooling liquid into the LNT area.
Further, the coolant injected by the cooling device into the LNT region may be pyrolyzed into hydrogen gas, which may undergo a reduction reaction with nitrogen oxides in the LNT region.
The method of preventing the LNT region from being unrecoverable after sulfur poisoning according to the second aspect of the present invention is applicable to the exhaust gas purification device of the first aspect. The method for preventing the LNT region from being unrecoverable after sulfur poisoning has the same advantages as those of the above-described exhaust gas purification apparatus over the prior art, and will not be described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of an exhaust gas purifying apparatus according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for preventing unrecoverable LNT zone 1 after sulfur poisoning according to an embodiment of the invention.
Description of reference numerals:
100-exhaust gas purification device, 10-exhaust gas channel, 1-LNT zone, 11-exhaust gas inlet, 2-cooling device, 21-water tank, 22-nozzle, 23-connecting hose, 3-DPF zone, 4-SCR zone, 5-sensor, 51-high temperature sensor, 52-oxygen sensor, 53-differential pressure sensor, 54-nitrogen oxygen sensor.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
An exhaust gas purifying apparatus 100 according to an embodiment of the present invention will be described in detail with reference to fig. 1. As shown in fig. 1, an exhaust gas purification apparatus 100 according to an embodiment of the present invention includes: LNT region 1 and cooling device 2, further, LNT region 1 is disposed in exhaust passage 10 of exhaust purification device 100, and LNT region 1 is disposed adjacent to exhaust inlet 11 side of exhaust passage 10. Further, cooling device 2 is established between LNT region 1 and exhaust inlet 11, and when LNT region 1 inside temperature was greater than 650 ℃, cooling device 2 can cool down to LNT region 1 for with LNT region 1 inside temperature control below 650 ℃, and then guarantee that LNT region 1 has the optimum temperature of nitrogen oxide in the processing exhaust, thereby satisfy exhaust emission's national standard requirement better.
Note that the LNT is lean NO X Trapping technology (Lean NO) X Trap)。
According to the exhaust gas purification apparatus 100 of the embodiment of the present invention, the cooling device 2 may cool the LNT region 1, and further, the temperature inside the LNT region 1 is controlled to be 650 ℃ or lower, so that the LNT region 1 has a better capability of treating nitrogen oxides in the exhaust gas, and thus, the international requirement of exhaust gas emission can be better satisfied.
According to the exhaust gas purification apparatus 100 of one embodiment of the present invention, as shown in fig. 1, the cooling device 2 includes: a water tank 21 and a nozzle 22, and further, the water tank 21 may contain a coolant that may be used to reduce the temperature within the LNT region 1. Further, a nozzle 22 is provided on the exhaust passage 10, the nozzle 22 is located between the LNT region 1 and the exhaust inlet 11, the nozzle 22 can spray the coolant onto the LNT region 1, and the nozzle 22 and the water tank 21 are communicated by a connection hose 23. In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. Alternatively, the cooling liquid may employ cooling water.
According to the exhaust gas purification apparatus 100 of an embodiment of the present invention, the orifice diameter of the nozzle 22 includes a plurality of orifice diameters, which correspond one-to-one to a predetermined temperature to be cooled in the LNT region 1, respectively. For example, in one particular embodiment, the orifice diameter may be set to decrease the LNT region 1 by 40 ℃ when the preset temperature is set to 650 ℃ and the exhaust temperature reaches 690 ℃. In the description of the present invention, "a plurality" means two or more.
According to the exhaust gas purification apparatus 100 of one embodiment of the present invention, the nozzle diameter is D, and satisfies: d is more than or equal to 0.1mm and less than or equal to 0.7mm. For example, in one specific embodiment, the orifice diameter D may be 0.1mm,0.15mm,0.3mm,0.4mm,0.5mm,0.7mm, and the respective coolant may be sprayed through the arrangement of the different orifice diameters D so that the preset temperature is not exceeded in the LNT region 1.
According to the exhaust gas purification apparatus 100 of one embodiment of the present invention, the cooling device 2 further includes: a supply pump (not shown in the figure), further, a supply pump is provided in the water tank 21 for supplying the cooling liquid to the nozzle 22.
According to the exhaust gas purification apparatus 100 of one embodiment of the present invention, the pump pressure in the water tank 21 is F, and satisfies: f is more than or equal to 5bar and less than or equal to 7bar. For example, in one specific embodiment, the pump pressure F in the tank 21 may be 5bar, 6bar, or 7bar, and the respective coolant may be injected through different settings of the pump pressure F, so that the preset temperature in the LNT region 1 is not exceeded.
The exhaust gas purification device 100 according to one embodiment of the present invention further includes: the on-board control unit (not shown) may control the spray nozzles 22 to spray the coolant into the LNT region 1, specifically, when the temperature in the LNT region 1 is greater than 650 deg.c and the excess air ratio in the LNT region 1 is greater than 1.2.
The exhaust gas purification apparatus 100 according to an embodiment of the present invention, as shown in fig. 1, further includes:
in the DPF region 3, the DPF is a diesel particulate trap.
The SCR region 4 and the DPF region 3 are disposed between the LNT region 1 and the SCR region 4, and further, exhaust gas from a vehicle enters the exhaust passage 10 through the exhaust inlet 11 and passes through the LNT region 1, the DPF region 3, and the SCR region 4 in sequence for purification treatment, thereby better satisfying the national standard requirements for exhaust emission. The SCR is a selective catalytic reduction device.
The plurality of sensors 5, and further the plurality of sensors 5 are provided in order upstream of the LNT region 1, the DPF region 3, and the SCR region 4, respectively, in the flow direction of the exhaust gas in the exhaust passage 10, and further the plurality of sensors 5 are used to detect the temperature and the oxygen content of the LNT region 1, the DPF region 3, and the SCR region 4, respectively. Specifically, as shown in fig. 1, the sensor 5 includes a high temperature sensor 51, an oxygen sensor 52, a differential pressure sensor 53, and a nitrogen oxygen sensor 54, the high temperature sensor 51 being operable to detect the temperature in the exhaust passage 10, the oxygen sensor 52 being operable to detect the excess air ratio in the exhaust passage 10; similarly, the differential pressure sensor 53 may be used to detect a pressure value in the exhaust passage 10, and the nitrogen oxygen sensor 54 may be used to detect a nitrogen oxygen content in the exhaust passage 10.
The principle of the exhaust gas purifying apparatus 100 for treating nitrogen oxides according to the embodiment of the present invention is described in detail below with reference to fig. 1:
in LNT region 1, baCO is coated 3 ，BaCO 3 Function to store and reduce nitrogen oxides. Further, coating the LNT with BaCO 3 When present, baO is produced, which likewise can act to store and reduce nitrogen oxides. Further, the LNT region 1 is susceptible to sulfur poisoning during the treatment of exhaust gas, and specifically, the sulfur poisoning process is as follows:
s + O in fuel 2 →SO 2 (1)
2BaO+O 2 +2SO 2 →2BaSO 4 (2)
Wherein BaSO4 is unable to process nitrogen oxides, thereby reducing the ability of LNT region 1 to store and reduce nitrogen oxides. Further, in one particular embodiment, if BaSO 4 No agglomeration, baSO 4 Is reducible to BaO at high temperatures (i.e., above 650 c) to help avoid the problem of reduced capacity of the LNT region 1 to store and reduce oxides of nitrogen as follows:
BaSO 4 +H 2 →BaO+H 2 O+SO 2 (3)
SO 2 +3H 2 →H 2 S+2H 2 O (4)
further, baO stores nitrogen oxides as follows:
BaO+2NO 2 +1/2O 2 →Ba(NO 3 ) 2 (5)
Ba(NO 3 ) 2 the process of releasing nitrogen oxides is as follows:
Ba(NO 3 ) 2 +CO 2 →BaCO 3 +3NO 2 +1/2O 2 (6)
Ba(NO 3 ) 2 +3H 2 +CO 2 →BaCO 3 +2NO+2CO 2 (7)
Ba(NO 3 ) 2 +1/3C 3 H 6 →BaCO 3 +2NO+H 2 O (8)
further, non-agglomerated BaSO can be obtained in the formula (3) and the formula (4) 4 Conversion of BaO to H 2 In addition, when the excess air ratio of the exhaust gas purification apparatus 100 is greater than 1.2, no H is contained in the exhaust gas 2 Generation of BaSO 4 Agglomeration problem occurs, and BaSO 4 Once agglomerated, it cannot be reduced to BaO again, thereby reducing, or even losing, the ability of the LNT region 1 to store and reduce nitrogen oxides, and is unrecoverable. In the exhaust purification device 100 according to the embodiment of the present invention, the LNT region 1 is provided with the cooling device 2, the high temperature sensor 51 and the oxygen content sensor 52 detect the temperature and the excess air ratio in the LNT region 1, and the vehicle-mounted control unit performs command control, so that the temperature in the LNT region 1 is not higher than 650 ℃, and the excess air ratio in the LNT region 1 is not higher than 1.2, and further the LNT region 1 has a better capability of treating nitrogen oxides in exhaust, thereby better satisfying the national standard requirements of exhaust emission.
Further, H 2 O can be further pyrolyzed to H 2 In particular, H 2 Is an essential element of LNT region 1 in the treatment of nitrogen oxides by the following mechanism:
C 3 H 6 +4H 2 O→3CO+6H 2 (9)
CO+H 2 O→CO 2 +H 2 (10)
further, by H 2 The nitrogen oxide treatment is carried out as follows:
NO+1/2H 2 →H 2 O+NH 3 (11)
H 2 +NO→H 2 O+1/2N 2 (12)
Ba(NO 3 ) 2 +8H 2 +CO 2 →BaCO 3 +2NH 3 +5H 2 O (13)
in the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.
In summary, according to the exhaust purification apparatus 100 of the embodiment of the present invention, the cooling device 2 is disposed in the LNT region 1, and the high temperature sensor 51 and the oxygen content sensor 52 detect the temperature and the excess air ratio in the LNT region 1, and the on-vehicle control unit performs command control, so as to ensure that the temperature in the LNT region 1 is not greater than 650 ℃, and the excess air ratio in the LNT region 1 is not greater than 1.2, and further the LNT region 1 has a better capability of treating nitrogen oxides in the exhaust, thereby better meeting the national standard requirement of exhaust emission; in addition H 2 O can be further pyrolyzed to H 2 And thus provides the necessary elements for LNT region 1 to treat nitrogen oxides.
The method of preventing the non-restorability of the LNT region 1 after sulfur poisoning according to the second aspect of the present invention may be applied to the exhaust gas purification apparatus 100 of the embodiment of the present invention, as shown in fig. 2, the method including the steps of:
s1, vehicle tail gas enters an exhaust channel 10 through an exhaust inlet 11, a high-temperature sensor 51 detects that the temperature in an LNT (low-fuel-LNT) region 1 is higher than 650 ℃, and an oxygen sensor 52 detects that the excess air coefficient in the LNT region 1 is higher than 1.2;
s2, transmitting detection information to the vehicle-mounted control unit by the high-temperature sensor 51 and the oxygen sensor 52;
s3, the vehicle-mounted control unit sends out an instruction to control the cooling device 2 to spray cooling liquid into the LNT region 1, meanwhile, the high-temperature sensor 51 continues to detect the temperature of the LNT region 1, and the oxygen sensor 52 continues to detect the excess air coefficient of the LNT region 1;
and S4, when the high temperature sensor 51 in the LNT area 1 detects that the temperature is not more than 650 ℃ and the oxygen sensor 52 detects that the excess air ratio is not more than 1.2, the vehicle-mounted control unit gives a command again to control the cooling device 2 to stop injecting the cooling liquid into the LNT area 1.
Further, the coolant sprayed from the cooling device 2 to the LNT region 1 may be pyrolyzed into hydrogen, and further, the hydrogen may undergo a reduction reaction with nitrogen oxides in the LNT region 1.
In conclusion, the method for preventing the LNT region 1 from being unrecoverable after sulfur poisoning according to the second aspect of the present invention has advantages such as better ability to treat nitrogen oxides in the exhaust gas.
The engine according to the third aspect of the present invention, including the exhaust gas purification apparatus 100 of the present embodiment, has the advantages of better capability of treating nitrogen oxides in the exhaust gas, and the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. An exhaust gas purification apparatus (100), characterized by comprising:
an LNT region (1), wherein the LNT region (1) is provided in an exhaust passage (10) of the exhaust purification device (100), and the LNT region (1) is provided adjacent to an exhaust inlet (11) side of the exhaust passage (10);
the cooling device (2), establish in LNT region (1) with between exhaust inlet (11), when the inside temperature in LNT region (1) is greater than 650 ℃, cooling device (2) is to LNT region (1) cooling for with the inside temperature control in LNT region (1) below 650 ℃.
2. The exhaust gas purification apparatus (100) according to claim 1, wherein the cooling device (2) includes:
a water tank (21), wherein the water tank (21) contains cooling liquid;
a nozzle (22), the nozzle (22) being disposed on the exhaust passage (10), the nozzle (22) being located between the LNT region (1) and the exhaust inlet (11), the nozzle (22) being capable of spraying the coolant onto the LNT region (1), the nozzle (22) and the water tank (21) being in communication through a connection hose (23).
3. The exhaust gas purification apparatus (100) according to claim 2, wherein the nozzle orifice diameter of the nozzle (22) includes a plurality of orifice diameters, each of which corresponds one-to-one to a predetermined temperature to be cooled in the LNT region (1).
4. The exhaust gas purification device (100) according to claim 3, wherein the nozzle diameter is D and satisfies: d is more than or equal to 0.1mm and less than or equal to 0.7mm.
5. The exhaust gas purification apparatus (100) according to claim 2, wherein the cooling device (2) further includes: a supply pump provided within the water tank (21) to supply the cooling liquid to the nozzle (22).
6. The exhaust gas purification device (100) according to claim 2, characterized in that the pump pressure in the water tank (21) is F and satisfies: f is more than or equal to 5bar and less than or equal to 7bar.
7. The exhaust gas purification device (100) according to claim 2, further comprising: an on-board control unit that controls the spray nozzle (22) to spray coolant into the LNT region (1) when the temperature in the LNT region (1) is greater than 650 ℃, and the excess air ratio in the LNT region (1) is greater than 1.2.
8. The exhaust gas purification device (100) according to any one of claims 1 to 7, further comprising:
a DPF area (3);
an SCR region (4), wherein the DPF region (3) is disposed between the LNT region (1) and the SCR region (4), and exhaust gas from the vehicle enters the exhaust passage (10) through the exhaust inlet (11) and passes through the LNT region (1), the DPF region (3), and the SCR region (4) in this order to be purified;
and a plurality of sensors (5), wherein the plurality of sensors (5) are provided in the upstream of the LNT region (1), the DPF region (3), and the SCR region (4), respectively, in this order in the flow direction of exhaust gas in the exhaust passage (10), and the plurality of sensors (5) are used for detecting the temperature and the oxygen content of the LNT region (1), the DPF region (3), and the SCR region (4), respectively.
9. A method of preventing unrecoverability of an LNT region (1) after sulfur poisoning, which is applicable to an exhaust gas purification device (100) according to any one of claims 1 to 8, comprising the steps of:
s1, vehicle exhaust enters an exhaust channel (10) through an exhaust inlet (11), a high-temperature sensor (51) detects that the temperature in an LNT (1) region is higher than 650 ℃, and an oxygen sensor (52) detects that the excess air coefficient in the LNT region (1) is higher than 1.2;
s2, the high-temperature sensor (51) and the oxygen sensor (52) transmit detection information to an on-board control unit;
s3, the vehicle-mounted control unit sends out a command, the cooling device (2) is controlled to inject cooling liquid into the LNT area (1), meanwhile, the high-temperature sensor (51) continues to detect the temperature of the LNT area (1), and the oxygen sensor (52) continues to detect the excess air coefficient of the LNT area (1);
and S4, when the high-temperature sensor (51) in the LNT region (1) detects that the temperature is not more than 650 ℃ and the oxygen sensor (52) detects that the excess air factor is not more than 1.2, the vehicle-mounted control unit gives out a command again and controls the cooling device (2) to stop injecting the cooling liquid into the LNT region (1).
10. The method of preventing the LNT region (1) from being unrecoverable after sulfur poisoning according to claim 9, wherein the coolant sprayed from the cooling device (2) to the LNT region (1) is pyrolyzed into hydrogen that can undergo a reduction reaction with nitrogen oxides in the LNT region (1).
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