CN115263498A - Method, recording medium and system for controlling urea crystallization in process of removing nitrogen oxides by adding urea into diesel vehicle - Google Patents
Method, recording medium and system for controlling urea crystallization in process of removing nitrogen oxides by adding urea into diesel vehicle Download PDFInfo
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- CN115263498A CN115263498A CN202210871437.7A CN202210871437A CN115263498A CN 115263498 A CN115263498 A CN 115263498A CN 202210871437 A CN202210871437 A CN 202210871437A CN 115263498 A CN115263498 A CN 115263498A
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
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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
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- 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
-
- 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 belongs to the technical field of internal combustion engine tail gas treatment, and particularly relates to a method for controlling urea crystallization in a process of adding urea into a diesel vehicle to remove nitrogen oxides. The invention also provides a non-transient readable recording medium storing the program of the method and a system comprising the medium, wherein the program can be called by a processing circuit to execute the method.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine tail gas treatment, and discloses a method for controlling urea crystallization in a process of adding urea to a diesel vehicle to remove nitrogen oxides, a recording medium and a system which are stored with a program capable of executing the method.
Background
The Selective Catalytic Reduction (SCR) technology is a mainstream technology for reducing emission of nitrogen oxides () at present, and the technology mainly utilizes a urea nozzle to spray urea aqueous solution to the front end of a mixer, and the urea aqueous solution and tail gas coming out of a diesel particulate filter enter the mixer together for sufficient mixing, so that the aim of catalytically reducing the nitrogen oxides into nitrogen and water is fulfilled.
Due to the working conditions of low running speed and normal idling of urban logistics vehicles, the exhaust temperature and the tail gas flow are small, urea aqueous solution cannot be completely brought into mixed gas and oxidation-reduction reaction occurs, part of sprayed urea is deposited at metal wires of a mixer to form compact urea crystals, the compact urea crystals can block gaps among the metal wires, urea cannot pass through the metal wires, the SCR conversion efficiency is reduced, and tail-discharged NOx is large. The crystal accumulation can cause the defects of SCR efficiency reduction, exhaust back pressure increase, fuel consumption increase and the like.
Disclosure of Invention
In order to solve the above problems, in order to meet the NOx conversion efficiency and avoid the serious crystallization before the regeneration mileage of the diesel vehicle is reached, the following method is adopted to control the urea injection, and the method specifically comprises the following steps:
s1, stopping spraying urea at idle speed;
s2, detecting the conversion efficiency of nitrogen oxides and the residual urea crystallization amount from a urea nozzle to the front end of a mixer in a catalytic regeneration interval during driving;
s2-1, if the conversion efficiency and the urea crystallization amount reach the standard, keeping the existing urea injection strategy;
s2-2, if the conversion efficiency reaches the standard and the urea crystallization amount does not reach the standard, reducing the urea injection upper limit until the conversion efficiency just reaches the standard, detecting whether the urea crystallization amount reaches the standard, and if so, finishing the adjustment; if not, entering the step S3;
s2-3, if the urea crystallization amount reaches the standard and the conversion efficiency does not reach the standard, improving the urea injection coefficient until the urea crystallization amount reaches the standard and just reaches the standard; detecting whether the conversion efficiency reaches the standard or not, and finishing the adjustment if the conversion efficiency reaches the standard; if not, entering the step S3;
and S3, extracting the vehicle operation working condition corresponding to a square block interval in a coordinate system formed by the exhaust emission on the horizontal axis and the exhaust temperature on the vertical axis, and adjusting the urea injection coefficient according to the items which do not reach the standard in the vehicle operation working condition until all the items reach the standard.
The adjustment mode eliminates most potential risks of exceeding crystallization by using simple parameter limitation, and only if a small part of conditions which cannot be solved in the steps S1-S2 cannot reach the standard, the problem is solved in a targeted manner in the step S3, so that the adjustment times are saved, and the adjustment efficiency is improved.
Preferably, the exhaust emission is in the unit of 1g/s and ranges from 1g/s to 150g/s; the temperature is 10 ℃ as a unit, the range is 30-300 ℃, the coordinate system is divided into a plurality of grids, and the block interval in the step S3 is formed by a plurality of grids which are sequentially selected from the left lower corner to the right upper corner of the range of the normal driving state in the coordinate system.
The area frame selection method preferentially selects a detection object from an area defined by low discharge capacity and low exhaust temperature, and the detection means directly points to the working condition which is most prone to generate crystallization, so that the problem of excessive crystallization can be solved more quickly by adjusting the injection coefficient.
Further, the preferred block interval is a frame selection area with the exhaust temperature of 200-250 ℃ and the exhaust emission of 7-40g/s in the coordinate system.
Experiments show that the interval is a working condition interval which easily causes the crystallization exceeding in the driving process.
In another aspect, the present invention provides a non-transitory readable recording medium storing one or more programs comprising instructions which, when executed, cause a processing circuit to perform the above method for controlling urea crystallization in a diesel vehicle urea addition process for removing nox.
The invention further provides a system for controlling urea crystallization in a process of adding urea to a diesel vehicle to remove nitrogen oxides, comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program comprises a plurality of instructions, and the processing circuit runs the program and can execute the method for controlling urea crystallization in a process of adding urea to a diesel vehicle to remove nitrogen oxides.
Drawings
FIG. 1 is a flow chart illustrating specific steps in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any new work, are within the scope of the present invention.
As shown in fig. 1, embodiments of the present invention are produced according to the following steps:
when a common vehicle normally runs, urea sprayed into the SCR assembly by the urea injector assembly enters the mixer along with tail gas, NOx in the tail gas is reduced into nitrogen and water by the urea after the urea is fully mixed, a small amount of crystals are generally formed, and the nitrogen and water can be burnt cleanly by regenerated high-temperature waste gas discharged from the diesel particle filter after the regeneration mileage is reached without influencing the SCR efficiency and normal exhaust back pressure.
The urban logistics vehicle can often run in an idling mode due to frequent loading and unloading, the engine exhaust period flow and exhaust temperature are low under the working condition, the mixing sufficiency of waste gas and urea injected by a urea injector assembly and the completeness of reduction reaction are not facilitated, urea deposition is easily formed at the front end of a mixer to cause crystallization, and the engine NOx original emission under the working condition is low, so that the idling stop injection is directly performed in the step S1, and the tail emission can meet the regulation requirement under the condition that the crystallization is not caused.
Except for normal idling, the running speed of the urban logistics vehicle is not too high, and based on the fact that the exhaust temperature and the exhaust flow are not enough to enable the urea water solution sprayed by the injector assembly to be fully consumed and to easily form crystals, and a conventional spraying strategy can generally meet the requirement of SCR conversion efficiency, so that referring to the step S2 of the invention, firstly, the running spraying amount is limited, the maximum value of urea spraying in the whole region is reduced, and the NOx values of the upstream and the downstream of the SCR measured by the nitrogen-oxygen sensor are monitored within a regeneration mileage, so that whether the SCR conversion efficiency meets the requirement or not is reflected; and (3) simulating the running condition of the urban logistics vehicle, detaching the ejector assembly every 1/4 of the regeneration mileage to check crystallization, and observing whether the crystallization at the urea nozzle and the mixer can meet the requirements. Based on fig. 1, if all the requirements can be met, the urea injection quantity is adjusted according to the scheme.
According to fig. 1, if the SCR conversion efficiency can be satisfied by reducing the urea injection amount according to the initially set value, the crystallization situation is not satisfactory, and then the urea injection amount is reduced until both the crystallization and the SCR conversion efficiency can satisfy the requirements.
If the urea injection limit is too low, crystallization can be met, SCR efficiency is difficult to meet the requirement, and the urea injection amount can be properly increased until crystallization and SCR conversion efficiency can meet the requirement.
If the urea injection amount of the whole emission interval is corrected upwards or downwards according to the method, the SCR efficiency and the crystallization can not meet the requirement at the same time, the method enters the step S3 of the invention, the urea injection amount of a specific area (the exhaust temperature is 200-250 ℃, and the exhaust flow is 7-40 g/S) is considered to be limited, and the injection limit value is multiplied by a specific coefficient to check the adjusted SCR efficiency and the crystallization condition. If the crystallization meets the requirement and the SCR efficiency does not meet, the coefficient is more than 1, so that the injection quantity of the area is increased; if the SCR efficiency is satisfactory and the crystal is not satisfactory, the coefficient is less than 1, thereby reducing the injection amount in the region. According to this method, the optimum confinement region and injection coefficient are sought until the SCR efficiency and crystallization can be simultaneously met.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computers, usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.), and having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The technical scheme of the invention is that the method steps are compiled into a program and then the program is stored in a hard disk or other non-transient storage media to form the non-transient readable recording medium; the storage medium is electrically connected with a computer processor, and crystallization exceeding is avoided by controlling the urea injection amount, so that the technical scheme of the system for controlling urea crystallization in the process of removing nitrogen oxides by adding urea to the diesel vehicle is formed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for controlling urea crystallization in the process of removing nitrogen oxides by adding urea to a diesel vehicle is characterized by comprising the following steps:
s1, stopping spraying urea at idle speed;
s2, detecting the conversion efficiency of nitrogen oxides and the residual urea crystallization amount from a urea nozzle to the front end of a mixer in a catalytic regeneration interval during driving;
s2-1, if the conversion efficiency and the urea crystallization amount reach the standard, keeping the existing urea injection strategy;
s2-2, if the conversion efficiency reaches the standard and the urea crystallization amount does not reach the standard, reducing the urea injection upper limit until the conversion efficiency just reaches the standard, detecting whether the urea crystallization amount reaches the standard, and if so, finishing the adjustment; if not, entering the step S3;
s2-3, if the urea crystal amount reaches the standard and the conversion efficiency does not reach the standard, improving the urea injection coefficient until the urea crystal amount reaches the standard and just reaches the standard; detecting whether the conversion efficiency reaches the standard or not, and finishing the adjustment if the conversion efficiency reaches the standard; if not, entering the step S3;
and S3, extracting the vehicle operation working condition corresponding to a square block interval in a coordinate system formed by the exhaust emission on the horizontal axis and the exhaust temperature on the vertical axis, and adjusting the urea injection coefficient according to the items which do not reach the standard in the vehicle operation working condition until all the items reach the standard.
2. The method for controlling urea crystallization in the process of removing nitrogen oxides by adding urea to a diesel vehicle as claimed in claim 1, wherein the exhaust gas discharge capacity is in the unit of 1g/s and is in the range of 1-150g/s; the temperature is 10 ℃ as a unit, the range is 30-300 ℃, the coordinate system is divided into a plurality of grids, and the block interval in the step S3 is composed of a plurality of grids which are sequentially selected from the left lower corner to the right upper corner of the range of the normal driving state in the coordinate system.
3. The method as claimed in claim 2, wherein the block interval is a frame selected area of the coordinate system with exhaust temperature of 200-250 ℃ and exhaust emission of 7-40 g/s.
4. A non-transitory readable recording medium storing one or more programs containing instructions that, when executed, cause processing circuitry to perform a method for controlling urea crystallization during diesel vehicle urea addition for nitrogen oxide removal as claimed in any one of claims 1-3.
5. A system for controlling urea crystallization during nox removal process of diesel vehicle adding urea, comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program comprises a plurality of instructions, and the processing circuit executes the program and is capable of executing a method for controlling urea crystallization during nox removal process of diesel vehicle adding urea according to any one of claims 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210871437.7A CN115263498B (en) | 2022-07-22 | 2022-07-22 | Method, recording medium and system for controlling urea crystallization in process of adding urea to remove nitrogen oxides in diesel vehicle |
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| CN202210871437.7A CN115263498B (en) | 2022-07-22 | 2022-07-22 | Method, recording medium and system for controlling urea crystallization in process of adding urea to remove nitrogen oxides in diesel vehicle |
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| CN115263498A true CN115263498A (en) | 2022-11-01 |
| CN115263498B CN115263498B (en) | 2023-04-25 |
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| CN113530644A (en) * | 2020-04-16 | 2021-10-22 | 北京福田康明斯发动机有限公司 | Self-adaptive nitrogen oxide control method and device for diesel engine |
| CN114135376A (en) * | 2021-11-01 | 2022-03-04 | 潍柴动力股份有限公司 | Double-nozzle urea crystallization control method and exhaust gas aftertreatment system |
| CN114183221A (en) * | 2020-09-15 | 2022-03-15 | 长城汽车股份有限公司 | Method and device for removing urea crystals |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012142745A1 (en) * | 2011-04-19 | 2012-10-26 | 潍柴动力股份有限公司 | Device and method for controlling urea injection system of diesel engine |
| WO2018120468A1 (en) * | 2016-12-30 | 2018-07-05 | 广西玉柴机器股份有限公司 | Lcce optimization-based diesel engine calibration method |
| CN110761879A (en) * | 2019-12-27 | 2020-02-07 | 潍柴动力股份有限公司 | Method and device for controlling urea crystallization, storage medium, and electronic device |
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| CN113339112A (en) * | 2021-06-30 | 2021-09-03 | 同济大学 | SCR (Selective catalytic reduction) system for preventing urea crystallization and control method thereof |
| CN114135376A (en) * | 2021-11-01 | 2022-03-04 | 潍柴动力股份有限公司 | Double-nozzle urea crystallization control method and exhaust gas aftertreatment system |
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