CN113685249A - Aftertreatment injection system, vehicle and control method - Google Patents
Aftertreatment injection system, vehicle and control method Download PDFInfo
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- CN113685249A CN113685249A CN202110955816.XA CN202110955816A CN113685249A CN 113685249 A CN113685249 A CN 113685249A CN 202110955816 A CN202110955816 A CN 202110955816A CN 113685249 A CN113685249 A CN 113685249A
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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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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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
- F01N3/08—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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/06—Adding substances to exhaust gases the substance being in the gaseous form
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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
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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 belongs to the technical field of vehicle tail gas aftertreatment, and particularly relates to an aftertreatment injection system, a vehicle and a control method. The aftertreatment injection system comprises a tail gas pipeline, a gas-liquid double injection device, a low-temperature SCR catalyst and a high-temperature SCR catalyst assembly, wherein a temperature sensor is arranged at the gas inlet end of the tail gas pipeline, a control valve is arranged at the gas outlet end of the tail gas pipeline, the gas-liquid double injection device is communicated with the tail gas pipeline and is far away from the control valve, the gas inlet end of the low-temperature SCR catalyst is connected with the first gas outlet end of the control valve, the first gas inlet end of the high-temperature SCR catalyst assembly is communicated with the second gas outlet end of the control valve, the second gas inlet end of the high-temperature SCR catalyst assembly is communicated with the gas outlet end of the SCR low-temperature catalyst, and the gas outlet end of the high-temperature SCR catalyst assembly is communicated with the atmosphere. Through the aftertreatment injection system in this technical scheme of use, can reduce the start-up injection temperature, promote low temperature SCR efficiency, realize NOx's minimum discharge.
Description
Technical Field
The invention belongs to the technical field of vehicle tail gas aftertreatment, and particularly relates to an aftertreatment injection system, a vehicle and a control method.
Background
At present, a Selective Catalytic Reduction (SCR) technical route is generally adopted by a diesel engine, namely, a standard automobile urea aqueous solution is injected into exhaust gas, ammonia gas generated by decomposition of the urea aqueous solution is used for carrying out selective catalytic reduction on NOx, and harmless nitrogen and water are generated. Another solid-state ammonia storage technology is the adsorption and release of ammonia gas using solid materials, and a solid-state ammonia system (also known as a solid-state SCR system) is equipped with a cylinder containing solid materials on a vehicle. During vehicle operation, the material is heated to release ammonia and is metered into the exhaust pipe through a control valve.
However, the general exhaust urea treatment technology cannot realize exhaust purification under low-temperature and low-speed working conditions, and the low-temperature SCR efficiency is low. Compared with the existing urea injection technology, the solid ammonia storage technology has the advantages that the solid ammonia storage technology is mainly used in a low-temperature stage, the existing urea system needs to be completely replaced by the solid ammonia technology for realizing high technology, the cost is high, the feasibility is low, and the technology has no obvious advantages in a medium-high temperature stage compared with the urea technology.
Disclosure of Invention
The invention aims to at least solve the problem of low-temperature SCR efficiency of an SCR catalytic unit for treating tail gas in the prior art. The purpose is realized by the following technical scheme:
a first aspect of the invention proposes an aftertreatment injection system comprising:
the tail gas pipeline is provided with a temperature sensor at the gas inlet end and a control valve at the gas outlet end;
the gas-liquid double-injection device is communicated with the tail gas pipeline and is far away from the control valve, the gas-liquid double-injection device comprises an injector, a urea injection assembly and an ammonia injection assembly, and the urea injection assembly and the ammonia injection assembly are communicated with the tail gas pipeline through the injector;
the air inlet end of the low-temperature SCR catalyst is connected with the first air outlet end of the control valve;
and the first air inlet end of the high-temperature SCR catalytic assembly is communicated with the second air outlet end of the control valve, the second air inlet end of the high-temperature SCR catalytic assembly is communicated with the air outlet end of the low-temperature SCR catalytic device, and the air outlet end of the high-temperature SCR catalytic assembly is communicated with the atmosphere.
By using the post-treatment injection system in the technical scheme, a tail gas pipeline, a gas-liquid double-injection device, a combined structure of a low-temperature SCR catalyst and a high-temperature SCR catalyst assembly are adopted, the temperature of tail gas can be detected according to a temperature sensor at the gas inlet end of the tail gas pipeline, ammonia gas injection or urea injection is selected, and a subsequent catalyst (the high-temperature SCR catalyst assembly or the low-temperature SCR catalyst) with different temperatures is correspondingly started through a control valve, so that the problems of low speed and cold start of the vehicle, SCR catalyst NOx conversion efficiency and low urea start temperature can be solved.
In addition, the aftertreatment injection system according to the invention may also have the following additional technical features:
in some embodiments of the present invention, the urea injection assembly includes a urea tank, a urea inlet pipe and a urea return pipe, and the urea tank and the injector are respectively communicated with the urea inlet pipe and the urea return pipe.
In some embodiments of the invention, the ammonia gas injection assembly comprises an ammonia gas tank and an ammonia gas pipe, the ammonia gas tank and the injector being in communication through the ammonia gas pipe.
In some embodiments of the present invention, an air distribution plate is further disposed on the exhaust pipeline, and the air distribution plate is disposed between the gas-liquid dual injection device and the control valve.
In some embodiments of the invention, the high-temperature SCR catalyst assembly comprises a high-temperature SCR catalyst, an air inlet end of the high-temperature SCR catalyst is communicated with the second air outlet end, and an air outlet end of the high-temperature SCR catalyst is connected with the atmosphere.
In some embodiments of the present invention, the high-temperature SCR catalytic assembly includes a housing, the housing is sleeved outside the high-temperature SCR catalytic device, and a flow cavity is disposed between the housing and the high-temperature SCR catalytic device, an air inlet end of the flow cavity is communicated with an air outlet end of the low-temperature SCR catalytic device, and an air outlet end of the flow cavity is communicated with the atmosphere.
In some embodiments of the invention, a urea mixer is further provided between the high-temperature SCR catalytic assembly and the control valve.
In some embodiments of the invention, the temperature sensor, the control valve and the injector are all connected to a control center.
The invention also provides a vehicle with the aftertreatment injection system.
The invention also proposes a control method of an aftertreatment injection system, implemented according to the above mentioned aftertreatment injection system, comprising:
acquiring a temperature value of a temperature sensor according to the idling or cold start or low-temperature and low-load state of a vehicle;
controlling the ejector and the urea injection assembly to operate according to the fact that the temperature value is larger than the preset temperature value, and controlling the control valve to open the second outlet end and close the first outlet end;
and controlling the ejector and the ammonia gas injection assembly to operate according to the temperature value smaller than the preset temperature value, and controlling the control valve to open the first outlet end and close the second outlet end.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates an overall structural schematic of an aftertreatment injection system according to an embodiment of the invention;
FIG. 2 schematically illustrates a control flow diagram of an aftertreatment injection system according to an embodiment of the invention.
The reference numerals in the drawings denote the following:
10: tail gas pipeline, 11: temperature sensor, 12: control valve, 13: gas distribution plate, 14: a urea mixer;
20: gas-liquid dual injection device, 21: ejector, 221: ammonia pipe, 231: urea liquid inlet pipe, 232: a urea return pipe;
30: a low temperature SCR catalyst;
40: high-temperature SCR catalytic assembly, 41: high-temperature SCR catalyst, 42: housing, 43: a flow chamber.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Fig. 1 schematically shows an overall structural view of an aftertreatment injection system according to an embodiment of the invention. The present invention proposes an aftertreatment injection system, as shown in fig. 1. The post-treatment injection system comprises a tail gas pipeline 10 and a gas-liquid double-injection device 20, the low-temperature SCR catalytic converter 30 and the high-temperature SCR catalytic module 40, the inlet end of the tail gas pipeline 10 is provided with a temperature sensor 11, the outlet end of the tail gas pipeline 10 is provided with a control valve 12, the gas-liquid double injection device 20 is communicated with the tail gas pipeline 10 and is far away from the control valve 12, the gas-liquid double injection device 20 comprises an injector 21, a urea injection assembly and an ammonia injection assembly, the urea injection assembly and the ammonia injection assembly are both communicated with the tail gas pipeline 10 through the injector 21, the inlet end of the low-temperature SCR catalytic converter 30 is connected with the first outlet end of the control valve 12, the first inlet end of the high-temperature SCR catalytic module 40 is communicated with the second outlet end of the control valve 12, the second inlet end of the high-temperature SCR catalytic module 40 is communicated with the outlet end of the low-temperature SCR catalytic converter 30, and the outlet end of the high-temperature SCR catalytic module 40 is communicated with the atmosphere.
By using the post-treatment injection system in the technical scheme, the combined structure of the tail gas pipeline 10, the gas-liquid dual-injection device 20, the low-temperature SCR catalyst 30 and the high-temperature SCR catalyst assembly 40 is adopted, the temperature of the tail gas can be detected according to the temperature sensor 11 at the gas inlet end of the tail gas pipeline 10, ammonia gas injection or urea injection is selected, and the subsequent catalysts (the high-temperature SCR catalyst assembly 40 or the low-temperature SCR catalyst assembly 30) with different temperatures are correspondingly started through the control valve 12, so that the problems that the NOx conversion efficiency of the SCR catalyst and the urea start-up injection temperature are low in the low-speed and cold-start stages of the vehicle idling can be solved.
Specifically, the catalyst of the low-temperature SCR catalyst 30 in the present invention is a low-temperature catalyst, and the SCR reaction can start at a relatively low temperature of about 50 ℃ to 100 ℃, and the temperature requirement for urea decomposition is not met due to low temperature when the vehicle is started, so the NH3-SCR reaction is adopted at this time.
In some embodiments of the present invention, as shown in fig. 1, the urea injection assembly includes a urea tank, a urea inlet pipe 231 and a urea return pipe 232, and the urea tank and the injector 21 are respectively communicated with each other through the urea inlet pipe 231 and the urea return pipe 232. The urea tank in the present embodiment is used to supply a urea solution to the exhaust gas pipe 10 so as to perform the subsequent SCR catalytic operation of the exhaust gas at a high temperature. In addition, a urea return pipe 232 and a urea inlet pipe 231 are used for the circulation flow of urea.
In some embodiments of the present invention, as shown in fig. 1, the ammonia gas injection assembly includes an ammonia gas tank and an ammonia gas pipe 221, and the ammonia gas tank and the injector 21 are communicated through the ammonia gas pipe 221. The ammonia tank is used for providing ammonia, and subsequent SCR catalytic operation of tail gas at low temperature is carried out. In addition, an ammonia gas pipe 221 is used to connect the ammonia tank and the injector 21.
Specifically, the ammonia gas tank in the invention may also be another ammonia storage device, and the urea tank may also be another urea storage device, and any device for storing ammonia gas and urea is within the scope of the invention.
Specifically, the injector 21 in the present invention enables switching injection of the urea injection module and the ammonia gas injection module, and when it is detected that the temperature of the temperature sensor 11 is lower than the temperature preset value, the injector 21 is switched to the ammonia gas injection module and the supply operation of the ammonia gas is performed. When it is detected that the temperature of the temperature sensor 11 is higher than the preset temperature value, the injector 21 switches to the urea injection module and performs the urea supply operation
In some embodiments of the present invention, as shown in fig. 1, a gas distribution plate 13 is further disposed on the exhaust pipeline 10, and the gas distribution plate 13 is disposed between the gas-liquid dual injection device 20 and the control valve 12. The gas distribution plate 13 can uniformly press the liquid or gas passing through the tail gas pipeline 10, so that the speed of the gas flow or liquid flow passing through the gas distribution plate 13 tends to be uniform, and the stability and reliability are improved.
In some embodiments of the present invention, as shown in fig. 1, the high-temperature SCR catalyst assembly 40 includes a high-temperature SCR catalyst 41, an air inlet end of the high-temperature SCR catalyst 41 is communicated with a second air outlet end, and an air outlet end of the high-temperature SCR catalyst 41 is connected with the atmosphere. The catalyst of the high-temperature SCR catalyst 41 in this embodiment is a high-temperature catalyst, and the SCR reaction can start to occur at a relatively low temperature of about 185 ℃ to 250 ℃, and the Urea-SCR reaction is adopted because the temperature of the exhaust gas becomes high after a period of time when the vehicle is running and does not meet the temperature requirement for ammonia decomposition.
In some embodiments of the present invention, as shown in fig. 1, the high-temperature SCR catalyst assembly 40 includes a housing 42, the housing 42 is sleeved outside the high-temperature SCR catalyst 41 and a flow cavity 43 is disposed between the housing 42 and the high-temperature SCR catalyst 41, an air inlet end of the flow cavity 43 is communicated with an air outlet end of the low-temperature SCR catalyst 30, and an air outlet end of the flow cavity 43 is communicated with the atmosphere. The tail gas after the reaction of the low-temperature SCR catalyst 30 is finished can not be directly discharged, but enters the flowing cavity 43 between the shell 42 and the high-temperature SCR catalyst 41 through a pipeline for heat exchange, so that the high-temperature SCR catalyst 41 can be heated by effectively utilizing waste heat, the problem that when the exhaust temperature reaches ammonia gas to switch urea, the temperature of a catalyst bed layer of the high-temperature SCR catalyst 41 does not reach the reaction temperature, the discharge fluctuation is caused, and the reliability is improved.
In some embodiments of the present invention, as shown in fig. 1, a urea mixer 14 is also provided between the high temperature SCR catalyst assembly 40 and the control valve 12. The urea mixer 14 can fully mix the tail gas and the urea, and finally enter the high-temperature SCR catalyst 41 for full catalytic reaction, so that the catalytic efficiency is improved.
In some embodiments of the invention, the temperature sensor 11, the control valve 12 and the injector 21 are all connected to a control centre.
The invention also provides a vehicle with the aftertreatment injection system.
By using the vehicle in the technical scheme, the combined structure of the tail gas pipeline 10, the gas-liquid dual-injection device 20, the low-temperature SCR catalyst 30 and the high-temperature SCR catalyst assembly 40 is adopted, the temperature of the tail gas can be detected according to the temperature sensor 11 at the gas inlet end of the tail gas pipeline 10, ammonia gas injection or urea injection is selected, and the subsequent catalysts (the high-temperature SCR catalyst assembly 40 or the low-temperature SCR catalyst assembly 30) with different temperatures are correspondingly started through the control valve 12, so that the problems of low NOx conversion efficiency of the SCR catalyst and low urea start-up temperature in the idle low-speed and cold-start stages of the vehicle can be solved.
The invention also proposes a control method of an aftertreatment injection system, as shown in fig. 1 and 2, implemented according to the above-mentioned aftertreatment injection system, comprising:
acquiring a temperature value of the temperature sensor 11 according to the idling or cold start or low-temperature and low-load state of the vehicle;
controlling the injector 21 and the urea injection assembly to operate according to the temperature value being greater than the preset temperature value, and controlling the control valve 12 to open the second outlet end and close the first outlet end;
and controlling the injector 21 and the ammonia gas injection assembly to operate according to the temperature value smaller than the preset temperature value, and controlling the control valve 12 to open the first outlet end and close the second outlet end.
By using the control method of the post-treatment injection system in the technical scheme, the combined structure of the tail gas pipeline 10, the gas-liquid dual-injection device 20, the low-temperature SCR catalyst 30 and the high-temperature SCR catalyst assembly 40 is adopted, the temperature of the tail gas can be detected according to the temperature sensor 11 at the gas inlet end of the tail gas pipeline 10, so that ammonia gas injection or urea injection is selected, and the subsequent catalysts (the high-temperature SCR catalyst assembly 40 or the low-temperature SCR catalyst assembly 30) with different temperatures are correspondingly started through the control valve 12, so that the problems of low NOx conversion efficiency of the SCR catalyst and low urea start-injection temperature in the low-speed and cold-start stages of the vehicle can be solved.
Specifically, as shown in fig. 1 and 2, after the temperature sensor 11 needs to be calibrated in advance through the bench test in the present embodiment, the control valve 12 on-off control value is input to the temperature control value T0. When tail gas enters the aftertreatment system, the control center judges a signal T of the temperature sensor 11, if T is less than T0, the control valve 12 opens the first outlet end and closes the second outlet end, namely, the catalytic reaction of the low-temperature SCR catalyst 30 is carried out, meanwhile, the injector 21 and the ammonia gas injection assembly of the gas-liquid injection device operate, namely, ammonia gas injection is carried out, and at the moment, the low-temperature SCR catalyst 30 carries out NH3-SCR reaction. When the control center receives the signal T from the temperature sensor 11, if T > T0, the control valve 12 opens the second outlet end and closes the first outlet end, i.e. the catalytic reaction of the high-temperature SCR catalyst 41 is performed, and at the same time, the injector 21 and the Urea injection component of the gas-liquid injection device operate, i.e. Urea injection is performed, and the SCR catalyst performs Urea-SCR reaction.
Specifically, as shown in fig. 2, the overall control flow of the aftertreatment injection system of the present invention is:
in a cold starting state, when the engine is ignited, the control valve 12 opens the loop of the low-temperature SCR catalyst 30 and closes the loop of the high-temperature SCR catalyst 41, and the tail gas and the ammonia gas of the gas-liquid double-injection device are mixed and then enter the low-temperature SCR catalyst 30 to generate low-temperature selective catalytic reaction. After the engine runs for a period of time, the aftertreatment exhaust temperature (namely the temperature value of the temperature sensor 11) is increased to the urea spraying starting temperature, the bed temperature of the high-temperature SCR catalyst 41 reaches the SCR reaction temperature, the control valve 12 closes the loop of the low-temperature SCR catalyst 30, opens the loop of the high-temperature SCR catalyst 41, and the tail gas enters the high-temperature SCR catalyst 41 to generate high-temperature selective catalytic reaction.
Under the condition that the engine is idling, when the control center monitors that the exhaust temperature of the engine is lower than T0, the control valve 12 opens the loop of the low-temperature SCR catalyst 30 and closes the loop of the high-temperature SCR catalyst 41, and the tail gas and the ammonia gas of the gas-liquid double-injection device are mixed and then enter the low-temperature SCR catalyst 30 to generate low-temperature selective catalytic reaction. When the engine finishes idling and finishes the engine state judgment, and the temperature is higher than T0, the control valve 12 closes the loop of the low-temperature SCR catalyst 30, opens the loop of the high-temperature SCR catalyst 41, and the tail gas enters the high-temperature SCR catalyst 41 to generate high-temperature selective catalytic reaction.
When the engine runs at low speed and low load for a long time, firstly, the state judgment is finished, when the exhaust temperature is lower than T0, the control valve 12 opens the loop of the low-temperature SCR catalyst 30, closes the loop of the high-temperature SCR catalyst 41, and the tail gas and the ammonia gas of the gas-liquid double-injection device are mixed and then enter the low-temperature SCR catalyst 30. When the engine finishes the low-speed low-load state, after the engine state judgment is finished, and the temperature is higher than T0, the control valve 12 closes the loop of the low-temperature SCR catalyst 30, opens the loop of the high-temperature SCR catalyst 41, and the tail gas enters the high-temperature SCR catalyst 41 to generate high-temperature selective catalytic reaction.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An aftertreatment injection system, comprising:
the tail gas pipeline is provided with a temperature sensor at the gas inlet end and a control valve at the gas outlet end;
the gas-liquid double-injection device is communicated with the tail gas pipeline and is far away from the control valve, the gas-liquid double-injection device comprises an injector, a urea injection assembly and an ammonia injection assembly, and the urea injection assembly and the ammonia injection assembly are communicated with the tail gas pipeline through the injector;
the air inlet end of the low-temperature SCR catalyst is connected with the first air outlet end of the control valve;
and the first air inlet end of the high-temperature SCR catalytic assembly is communicated with the second air outlet end of the control valve, the second air inlet end of the high-temperature SCR catalytic assembly is communicated with the air outlet end of the low-temperature SCR catalytic device, and the air outlet end of the high-temperature SCR catalytic assembly is communicated with the atmosphere.
2. The aftertreatment injection system of claim 1, wherein the urea injection assembly includes a urea tank, a urea inlet pipe, and a urea return pipe, the urea tank and the injector being in communication via the urea inlet pipe and the urea return pipe, respectively.
3. The aftertreatment injection system of claim 1, wherein the ammonia injection assembly comprises an ammonia tank and an ammonia line, the ammonia tank and the injector being in communication through the ammonia line.
4. The aftertreatment injection system of claim 1, further comprising a gas distribution plate disposed on the exhaust conduit between the gas-liquid dual injection device and the control valve.
5. The aftertreatment injection system of claim 1, wherein the high temperature SCR catalytic assembly comprises a high temperature SCR catalyst, an air inlet end of the high temperature SCR catalyst is in communication with the second air outlet end, and an air outlet end of the high temperature SCR catalyst is connected to atmosphere.
6. The aftertreatment injection system of claim 5, wherein the high-temperature SCR catalytic assembly comprises a housing, the housing is sleeved outside the high-temperature SCR catalytic device, a flow cavity is arranged between the housing and the high-temperature SCR catalytic device, an air inlet end of the flow cavity is communicated with an air outlet end of the low-temperature SCR catalytic device, and an air outlet end of the flow cavity is communicated with atmosphere.
7. The aftertreatment injection system of claim 1, further comprising a urea mixer between the high-temperature SCR catalytic assembly and the control valve.
8. The aftertreatment injection system of claim 1, wherein the temperature sensor, the control valve, and the injector are all connected to a control center.
9. A vehicle having an aftertreatment injection system according to any one of claims 1 to 8.
10. A control method of an aftertreatment injection system implemented according to any one of claims 1 to 8, comprising:
acquiring a temperature value of a temperature sensor according to the idling or cold start or low-temperature and low-load state of a vehicle;
controlling the ejector and the urea injection assembly to operate according to the fact that the temperature value is larger than the preset temperature value, and controlling the control valve to open the second outlet end and close the first outlet end;
and controlling the ejector and the ammonia gas injection assembly to operate according to the temperature value smaller than the preset temperature value, and controlling the control valve to open the first outlet end and close the second outlet end.
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