CN114575968A - NOxTrap desulfurization system and NOxDesulfurization method for catcher - Google Patents

NOxTrap desulfurization system and NOxDesulfurization method for catcher Download PDF

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Publication number
CN114575968A
CN114575968A CN202110208195.9A CN202110208195A CN114575968A CN 114575968 A CN114575968 A CN 114575968A CN 202110208195 A CN202110208195 A CN 202110208195A CN 114575968 A CN114575968 A CN 114575968A
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Prior art keywords
trap
reducing gas
catcher
sulfur
desulfurization
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Pending
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CN202110208195.9A
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Chinese (zh)
Inventor
刘世龙
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202110208195.9A priority Critical patent/CN114575968A/en
Publication of CN114575968A publication Critical patent/CN114575968A/en
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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]
    • 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
    • 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
    • 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
    • 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
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • 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
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention discloses a NOXTrap desulfurization system and NOXA method for desulfurizing a catcher. The NO isXThe trap desulfurization system includes: NOXA trap, a reducing gas generator, said NOXThe trap is provided with sulfur-containing substances, and the reducing gas generator is used for supplying the NOXAnd introducing reducing gas with reducibility into the gas inlet of the trap, wherein the reducing gas is used for desulfurizing the sulfur-containing substances. NO according to the inventionXTrap desulfurization system using separate reducing gas generationTo NOXThe trap is filled with reducing gas to directly react NOXThe sulfur-containing substances in the catcher are subjected to desulfurization treatment, and other parts are not affected.

Description

NOxTrap desulfurization system and NOxDesulfurization method for catcher
Technical Field
The invention relates to the field of automobiles, in particular to NOXTrap desulfurization system and NOXA method for desulfurizing a catcher.
Background
NO on vehicleXAfter the trap is used for a period of time, sulfur-containing substances are generated inside the trap, resulting in NOXTrap pair NOXThe adsorption capacity of (2) is reduced to influence NOXThe performance of the trap. Existing to NOXThe operation of desulfurizing sulfur-containing substances in the catcher is generally that the engine is added with post-oil injection treatment after main oil injection, and the post-oil injection is carried out to NOXGenerating reducing gas in the trap to react NOXThe sulfur-containing substances in the catcher are subjected to desulfurization treatment, but the desulfurization method easily causes NOXTrap ablation, improper post-injection, also increases oil dilution and carbon particulate in the exhaust.
Disclosure of Invention
In view of the above, the present invention is directed to provide a NOXTrap desulfurization system for NO in a new mannerXAnd (4) carrying out desulfurization treatment on the sulfur-containing substances in the catcher.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
NO (nitric oxide)XA trap desulfurization system comprising: NOXA trap, a reducing gas generator, NOXThe trap is provided with sulfur-containing substances, and the reducing gas generator is used for supplying the NOXAnd introducing reducing gas with reducibility into the gas inlet of the catcher, wherein the reducing gas is used for carrying out desulfurization treatment on the sulfur-containing substances.
According to some embodiments of the invention, the reducing gas comprises at least HC.
According to some embodiments of the invention, the concentration of HC in the reducing gas is 50ppm to 1000 ppm.
According to some embodiments of the invention, the temperature of the reducing gas is 600 ℃ to 800 ℃.
Optionally, the temperature of the reducing gas is from 650 ℃ to 720 ℃.
Optionally, the temperature of the reducing gas is 690 ℃ -760 ℃.
According to some embodiments of the invention, the NO isXThe trap desulfurization system further comprises: a control unit for setting a temperature of the reducing gas, a concentration of the HC in the reducing gas, and a temperature of the NOx to the NOXAt least one of the times of introducing the reducing gas into the gas inlet of the trap.
According to some embodiments of the invention, the NO isXThe trap has a catalyst therein, the catalyst comprising: the catalyst comprises a catalytic active component, a storage component and a carrier, wherein the catalytic active component and the storage component are distributed on the carrier, and the sulfur-containing substance is SOXA sulfide formed by reaction with the storage component.
NO according to the invention compared to the prior artXThe trap desulfurization system has the following advantages:
NO according to the inventionXTrap desulfurization system using a separate reducing gas generator to NOXThe trap is filled with reducing gas to directly react NOXThe sulfur-containing substances in the catcher are subjected to desulfurization treatment, and other parts are not affected.
Another object of the present invention is to provide a NOXMethod of trap desulfurization, said NOXTrap desulfurization method applicable to the NOX(ii) trap desulfurization system of said NOXThe catcher desulfurization method comprises the following steps: obtaining said NOXThe sulfur content of the sulfur-containing species in the trap; when the sulfur content reaches a preset sulfur-containing threshold value, adding the NOXThe catcher is detached from the vehicle; reacting said reducing gas generator with said NOXThe air inlet of the trap is communicated with the NOXIntroducing reducing gas into the catcher; to the NOXThe time for introducing the reducing gas into the catcher lasts for a preset time.
Further, said to said NOXAfter the time that the reducing gas is introduced into the catcher lasts for the preset time, the method further comprises the following steps: bringing the reducing gas generator and the NOXThe air inlet of the trap is disconnected and the NO is taken outXThe trap is reinstalled on the vehicle.
According to some embodiments of the invention, the NO isXWhen the trap is mounted on the vehicle, the NOXThe intake port of the trap is adapted to communicate with the exhaust port of the engine.
NO according to the invention compared to the prior artXThe catcher desulfurization method has the following advantages:
NO according to the inventionXMethod for trap desulfurization using a separate reducing gas generator to NOXThe trap is filled with reducing gas to directly react NOXThe sulfur-containing substances in the catcher are desulfurized without influencing other parts, and the time for introducing the reducing gas lasts for the preset time, so that thorough desulfurization can be ensured.
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 NO of an embodiment of the present inventionXA schematic of a trap desulfurization system;
FIG. 2 is in NOXWhen the trap is mounted on a vehicle, in NOXThe trap is connected with an engine and a diesel particulate trap when being installed on a vehicle;
FIG. 3 is NO of an embodiment of the present inventionXSchematic of a trap desulfurization process.
Description of reference numerals:
NOX trap 1, NOX Trap inlet 11, NOXAn air outlet 12 of the catcher, a reducing gas generator 2, a control unit 3, an engine 20 and a diesel particulate catcher 30.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to fig. 1 to 3 in conjunction with examples.
Referring to FIG. 1, a NO according to an embodiment of the present inventionXThe trap desulfurization system may include: NOXTrap 1 (i.e., LNT, Lean NO)XTraps), reducing gas generator 2, NOXThe trap 1 has sulfur-containing substances therein, and the reducing gas generator 2 is used for supplying NOXOf the catchers 1And reducing gas with reducibility is introduced into the gas inlet, and the reducing gas is used for desulfurizing the sulfur-containing substances.
Referring to FIG. 2, in NOXNO when the trap 1 is mounted on a vehicleXThe intake of the trap 1 is adapted to communicate with the exhaust 201 of the engine 20. NOX Exhaust port 12 of trap 1 is also adapted to be connected to an inlet 301 of a Diesel Particulate trap 30 (DPF), Diesel Particulate trap 30 being used for trapping NO from NOXDiesel particles coming out of the trap 1.
When NO is presentXNO when the trap 1 is mounted on a vehicleXThe trap 1 is used under certain conditions for absorbing NO in the exhaust gases of the engine 20XWhen absorbed NOXWhen the maximum capacity is reached, certain measures can be taken to reduce NOXReduction to N2And 02。
NO on vehicleXAfter the trap 1 is used for a period of time, sulfur-containing substances are generated inside, resulting in NOXTrap 1 pair NOXThe adsorption capacity of (2) is reduced to influence NOXThe performance of the trap 1. If directly to NO on the vehicleXThe sulfur-containing substances in the catcher 1 are subjected to desulfurization treatment, and the engine is subjected to after-injection treatment after main injection of oil in the running process of the vehicle, and the after-injection oil enters NOXThe trap 1 generates a reducing gas (e.g., HC gas) having strong reducibility in NOXA reduction reaction takes place in the trap 1, whereby NO is convertedXThe sulfur-containing substances in the trap 1 are desulfurized while ensuring a high temperature (usually higher than 600 ℃) of the reducing gas to support the reduction reaction, but the temperature of the reducing gas is inaccurately controlled on the vehicle, which tends to exceed the temperature of NOXThe highest temperature that the trap 1 can withstand, so this way of desulfation tends to result in NOXThe trap 1 ablates. In addition, improper post-injection mode may cause diesel oil to be injected on the cylinder wall and enter the engine oil in the oil pan, resulting in dilution of the engine oil, significant reduction in the lubricating performance of the engine oil mixed with diesel oil, accelerated wear of engine parts, and easy initiation of wear of engine partsThe burning is incomplete and the carbon particles in the exhaust gas increase.
NO according to embodiments of the inventionXTrap desulfurization system using a separate reducing gas generator 2 for NOXThe trap 1 is filled with reducing gas to directly react NOXThe sulfur-containing substances in the catcher 1 are subjected to desulfurization treatment without influencing other parts, so that the dilution rate of engine oil of an engine and the content of carbon particles in tail gas are not influenced.
In some embodiments of the invention, the reducing gas comprises at least HC. HC is a gas having reducing properties and is also a gas essential for desulfurization treatment.
In some embodiments of the invention, the concentration of HC in the reducing gas is from 50ppm to 1000 ppm. For example, the concentration of HC in the reducing gas may be 500ppm, 600ppm, 700ppm, or the like.
In some embodiments of the invention, the temperature of the reducing gas is from 600 ℃ to 800 ℃.
Alternatively, the temperature of the reducing gas is from 650 ℃ to 720 ℃. For example, the temperature of the reducing gas is 680 ℃.
Alternatively, the temperature of the reducing gas is 690 ℃ -760 ℃. For example, the temperature of the reducing gas is 700 ℃.
Referring to FIG. 1, NOXThe trap desulfurization system may further include: a control unit 3 for setting the temperature of the reducing gas, the HC concentration in the reducing gas, and the amount of NOx to be added to the reducing gasXAt least one of the times of introducing the reducing gas into the gas inlet of the trap 1.
For example, the temperature of the reducing gas, the concentration of HC in the reducing gas, and the amount of NO added to the reducing gas may be set in this order in the control unit 3XThe time for introducing the reducing gas into the gas inlet of the catcher 1.
In some embodiments of the invention, NOXThe trap 1 has a catalyst therein, which may include: the catalyst comprises a catalytic active component, a storage component and a carrier, wherein the catalytic active component and the storage component are suitable for being distributed on the carrier, the carrier is used for improving the dispersion degree of the catalytic active component and the storage component, and the sulfur-containing substance is SOXAnd storage componentSulfide produced by the reaction. Wherein the carrier may be γ -Al2O3The catalytically active component may be a noble metal Pt and the storage component may be an alkali and/or alkaline earth metal oxide, for example BaO or BaCO3. In some embodiments, the catalyst may be Pt/BaO/Al2O3Alternatively, it may be Pt/BaCO3/Al2O3。
In some alternative embodiments, NOXThe adsorption process and desorption process on the catalyst are as follows:
the reactions that take place on the catalyst by the adsorption process are as follows:
Figure BDA0002950142870000041
the reaction on the catalyst that occurs during desorption is as follows:
Figure BDA0002950142870000042
while sulfur in the exhaust gas of the engine 20 easily reacts with the storage component Ba to generate BaSO4Since sulfates are more stable than nitrates, once the constituent Ba is stored with the elemental SO in the engine 20 exhaustXReaction to produce BaSO4Is NO longer bound to NOXReaction, leading to reduced storage capacity or even deactivation of the catalyst, and therefore the need for NOXSulfur-containing substances in the trap 1 are desulfurized to remove NOXThe catalyst within trap 1 regains storage capacity.
The desulfurization method adopted in the prior art is to directly carry out desulfurization treatment on a vehicle, namely, the ECU of the engine 20 calculates the entering of fuel oil and engine oil into NO according to a strategyXThe amount of sulfur in the trap 1, when the ECU of the engine 20 monitors NOXWhen the sulfur amount in the catcher 1 reaches a certain limit value, a driver is reminded that the vehicle needs to enter a desulfurization mode, during the running of the vehicle, the engine is increased and then oil injection is carried out, HC gas with strong reducibility is generated in the oil injection, and Al gas is generated2O3Oxidation-reduction reaction on the substrate，BaSO4Is reduced to Ba0, and the active site on the carrier can be regenerated and precipitated. However, the desulfurization mode has a high requirement on the working condition of the engine 20, and even is not suitable for desulfurization under certain working conditions, so that the desulfurization mode can be repeatedly entered and exited, and the desulfurization effect is poor; in addition, the engine 20 is turned on for post-injection of fuel, NOXThe temperature in the trap 1 is difficult to control, and NO is easily causedXCarrier ablation and improper post-injection of fuel in the trap 1 also increases the oil dilution rate and carbon particles in the exhaust, putting pressure on the operation of the diesel particulate trap 30.
NO of the inventionXThe catcher desulfurization system can be oriented to after-sale maintenance stations, and different parameters can be set for the control unit 3 in the after-sale maintenance stations, so that NO with different sulfur contents and different materials can be realized for different manufacturersXThe desulfurization regeneration of the catcher 1 has wide applicability. Further, NO using the present inventionXAfter the trap desulfurization system, the desulfurization process is relatively stable, and NO caused by regeneration on a vehicle is avoidedXThe trap 1 has the ablation problem, and the after-injection of the engine 20 is not involved, so that the problem of engine oil dilution is avoided, and meanwhile, no intervention of the after-injection of the engine 20 is involved, so that carbon particles are not generated, and the exhaust emission quality is favorably improved.
The following describes NO using the present inventionXOne embodiment of a trap desulfurization system.
After the vehicle enters the service station, after-sales personnel read the data flow of the engine ECU through the vehicle diagnostic instrument and observe NOXSulphur content in trap 1, according to NO readXThe trap 1 contains sulfur content and NOXThe characteristics of the catalyst of the trap 1, set the parameters of the control unit 3. For example: NOXThe sulfur content in the catcher 1 is 4g, the catalyst failure temperature is more than or equal to 800 ℃, the control unit 3 is set to ensure that the reducing gas generator 2 generates stable reducing gas with HC content of 500ppm and temperature of 760 ℃, and NO is introduced into the reducing gasXIn the trap 1, NO was calculated after 800 seconds as described above for the desulfurization processXThe sulphur in trap 1 was just completely removed. The reducing gas generator can be closed after the desulfurization process is finished2, to NOXAfter the catcher 1 is cooled, the vehicle is loaded back, and then NO control is finishedXAnd (4) desulfurization and regeneration of the catcher 1.
NO according to another aspect of embodiments of the inventionXTrap desulfation method for NO of the above embodimentXTrap desulfurization system, shown in FIG. 3, NOXThe catcher desulfurization method comprises the following steps:
s1, obtaining NOXThe sulfur content of the sulfur species within the trap.
Specifically, the data stream of the engine ECU may be read by a vehicle diagnostic instrument to acquire NOXThe sulfur content of the sulfur species within the trap.
S2, when the sulfur content reaches the preset sulfur-containing threshold value, adding NOXThe trap is removed from the vehicle.
When the sulfur content reaches the preset sulfur-containing threshold value, the vehicle can send out warning information to remind the user of adding NO to the vehicleXThe catcher is detached from the vehicle for desulfurization treatment. The preset sulfur-containing threshold value can be 3g, 4g and the like, and the specific numerical value can be set according to the actual situation.
S3, reducing gas generator and NOXThe air inlet of the trap is communicated to NOXAnd introducing reducing gas into the catcher.
The reducing gas may be para to NOXAnd (4) carrying out desulfurization treatment on the sulfur-containing substances in the catcher. The temperature of the reducing gas is 600 ℃ to 800 ℃, and the concentration of HC gas in the reducing gas is 50ppm to 1000 ppm.
S4, to NOXThe time for introducing the reducing gas into the catcher lasts for a preset time. Thereby ensuring that the reducing gas can fully react with the sulfur-containing substances to fully desulfurize.
NO according to embodiments of the inventionXTrap desulfurization process to obtain NOXThe sulfur content of sulfur-containing substances in the catcher is adjusted to NO when the sulfur content reaches a preset sulfur-containing threshold valueXThe trap is detached from the vehicle and the reducing gas generator and NO are dischargedXThe air inlet of the trap is communicated to NOXIntroducing reducing gas into the trap to add NOXIntroducing reducing gas into the trap for a predetermined time, and introducing NO into the trap using a separate reducing gas generatorXThe trap is filled with reducing gas to directly react NOXThe sulfur-containing substances in the catcher are desulfurized without influencing other parts, and the time for introducing the reducing gas lasts for the preset time, so that thorough desulfurization can be ensured.
Further, referring to FIG. 3, to NOXAfter the time that the reducing gas is introduced into the catcher lasts for the preset time, the method further comprises the following steps:
s5, reducing gas generator and NOXThe trap's inlet is disconnected and NO is takenXThe trap is reinstalled on the vehicle.
After desulfurization, NOXThe sulfur-containing substances in the catcher are lower than a preset sulfur-containing threshold value, and the desulfurized NOXThe trap is reinstalled on the vehicle for continued use by the vehicle. It is to be noted that NO can be treatedXAfter the trap is cooled, it is returned to the vehicle to avoid high temperature NOXNO trap scalding operators or high temperaturesXThe trap affects the proper operation of other components on the vehicle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. NO (nitric oxide)XA trap desulfurization system, characterized by comprising:
NOXtrap of said NOXThe trap is internally provided with sulfur-containing substances;
a reducing gas generator for supplying the NO with the reducing gasXAnd introducing reducing gas with reducibility into the gas inlet of the catcher, wherein the reducing gas is used for carrying out desulfurization treatment on the sulfur-containing substances.
2. NO according to claim 1XTrap desulfation system, characterized in that said reducing gas comprises at least HC.
3. NO according to claim 2XA trap desulfurization system characterized in that the concentration of HC in the reducing gas is 50ppm to 1000 ppm.
4. NO according to any of claims 1-3XThe catcher desulfurization system is characterized in that the temperature of the reducing gas is 600-800 ℃.
5. NO according to claim 4XThe catcher desulfurization system is characterized in that the temperature of the reducing gas is 650-720 ℃ or 690-760 ℃.
6. NO according to claim 2 or 3XThe catcher desulfurization system is characterized by further comprising: a control unit for setting a temperature of the reducing gas, a concentration of the HC in the reducing gas, and a supply of the HC to the NOXAt least one item of time for introducing the reducing gas into the gas inlet of the trap.
7. NO according to claim 1XTrap desulfurization system, characterized in that the NO isXThe trap has a catalyst therein, the catalyst comprising: the catalyst comprises a catalytic active component, a storage component and a carrier, wherein the catalytic active component and the storage component are distributed on the carrier, and the sulfur-containing substance is SOXA sulfide formed by reaction with the storage component.
8. NO (nitric oxide)XMethod for desulphurizing a trap, characterized in that NO is presentXMethod for desulfation of a trap, suitable for use with NO according to any of claims 1 to 7X(ii) trap desulfurization system of said NOXThe catcher desulfurization method comprises the following steps:
obtaining said NOXSulfur-containing substances in the trapSulfur content of the sulfur;
when the sulfur content reaches a preset sulfur-containing threshold value, adding the NOXThe catcher is detached from the vehicle;
bringing the reducing gas generator and the NOXThe air inlet of the trap is communicated with the NOXIntroducing reducing gas into the catcher;
to the NOXThe time for introducing the reducing gas into the catcher lasts for a preset time.
9. NO according to claim 8XA method for desulfurizing a trap, characterized in that the step of supplying the NO to the trapXAfter the time that the trap is filled with the reducing gas lasts for the preset time, the method also comprises the following steps:
reacting said reducing gas generator with said NOXThe air inlet of the trap is disconnected and the NO is convertedXThe trap is reinstalled on the vehicle.
10. NO according to claim 8 or 9XMethod for desulfation of a trap, characterized in that in said NOXWhen the trap is mounted on the vehicle, the NOXThe intake port of the trap is adapted to communicate with the exhaust port of the engine.
CN202110208195.9A 2021-02-24 2021-02-24 NOxTrap desulfurization system and NOxDesulfurization method for catcher Pending CN114575968A (en)

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