CN112943420A - Strategy for correcting urea injection amount to prevent urea from crystallizing - Google Patents
Strategy for correcting urea injection amount to prevent urea from crystallizing Download PDFInfo
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- CN112943420A CN112943420A CN202110257484.8A CN202110257484A CN112943420A CN 112943420 A CN112943420 A CN 112943420A CN 202110257484 A CN202110257484 A CN 202110257484A CN 112943420 A CN112943420 A CN 112943420A
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- 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
- 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
- F01N3/18—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
- 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
- F01N2610/1486—Means to prevent the substance from freezing
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1404—Exhaust gas temperature
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a strategy for correcting urea injection quantity to prevent urea crystallization, relates to the technical field of tail gas aftertreatment, and solves the technical problem that the existing scheme aggravates urea crystallization, and the strategy comprises the following steps: calibrating urea crystallization rates under different urea injection quantities according to the exhaust temperature and the exhaust flow to obtain a urea crystallization rate MAP; calculating to obtain the maximum urea injection amount under each working condition according to the urea crystallization rate MAP and the urea crystallization rate smaller than 0.5 g/h; calibrating the maximum urea injection quantity under each working condition to a urea injection limit MAP; calculating to obtain required urea injection quantity according to the actual exhaust flow, the actual exhaust temperature and the actual nitrogen oxide concentration when the engine actually runs; inquiring the urea injection limit MAP according to the actual exhaust flow and the actual exhaust temperature to obtain the urea injection limit quantity; and comparing the required urea injection quantity with the urea injection limiting quantity, taking a small value as an actual urea injection quantity, and controlling the SCR system to work according to the actual urea injection quantity.
Description
Technical Field
The invention relates to the technical field of tail gas aftertreatment, in particular to a strategy for correcting urea injection quantity to prevent urea from crystallizing.
Background
SCR-selective catalytic reduction technology: the method is a treatment process aiming at NOx in tail gas emission of diesel vehicles, namely, under the action of a catalyst, a reducing agent ammonia or urea is sprayed to reduce the NOx in the tail gas into N2And H2And O. At the same time, part of free NH is adsorbed3And the catalyst is stored on the surface of the catalyst to ensure that the catalyst reacts with NOx under any working condition. However, when the urea water is used, a series of complex chemical reactions can occur easily in the process of generating ammonia gas, a plurality of intermediate products can be generated in the chemical reaction process, urea crystals at 133 ℃ absorb heat and melt, urea at 150 ℃ starts to thermally decompose HNCO, and decomposition at 200-250 ℃ is accelerated. But the HNCO only exists in a small amount, because at the temperature of 150-300 ℃, the HNCO can continuously generate cyanuric acid, ammelide and the like. Urea crystals condense at high temperatures to biuret cyanuric acid, even to form melamine and the like, and eventually form stones. After the urea is seriously crystallized, the SCR conversion efficiency is reduced, the exhaust resistance is increased, the oil consumption and the emission of an engine are influenced, and the engine cannot normally run.
The main traditional solution to urea crystallization is to query NH according to exhaust temperature as shown in FIG. 13Storing the target MAP to obtain the urea injection quantity required by ammonia storage, calculating the efficiency of a catalyst of the SCR system according to the exhaust temperature, calculating the theoretical urea injection quantity according to the exhaust flow and the concentration of exhaust nitrogen oxides, calculating the weighted urea injection quantity according to the efficiency of the catalyst and the theoretical urea injection quantity, adding the weighted urea injection quantity to the urea injection quantity required by ammonia storage to obtain the required urea injection quantity, and controlling the work of the SCR system according to the required urea injection quantity.
The conventional method has the following problems: in actual use, because actual detection values of exhaust temperature, exhaust flow rate and exhaust nitrogen-oxygen concentration have large fluctuation, the required urea injection amount calculated at low exhaust temperature and low exhaust flow rate is often large, urea is wasted, and urea crystallization is increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the defects of the prior art, and the present invention aims to provide a strategy for correcting the urea injection amount to reduce urea crystallization and preventing urea crystallization.
The technical scheme of the invention is as follows: a strategy for correcting urea injection quantity to prevent urea crystallization, the strategy comprising:
calculating to obtain exhaust energy according to the exhaust temperature and the exhaust flow, calibrating urea crystallization rates under different urea injection quantities according to the exhaust energy, and obtaining a urea crystallization rate MAP;
calculating to obtain the maximum urea injection amount under each working condition according to the urea crystallization rate MAP and the set urea crystallization rate;
calibrating the maximum urea injection quantity under each working condition to a urea injection limit MAP;
calculating to obtain required urea injection quantity according to the actual exhaust flow, the actual exhaust temperature and the actual nitrogen oxide concentration when the engine actually runs;
inquiring the urea injection limit MAP according to the actual exhaust flow and the actual exhaust temperature to obtain urea injection limit quantity;
and comparing the required urea injection quantity with the urea injection limiting quantity, taking a small value as an actual urea injection quantity, and controlling the SCR system to work according to the actual urea injection quantity.
As a further development, the exhaust gas energy is exhaust gas temperature exhaust gas flow rate/1000.
Further, the exhaust gas temperature is an exhaust gas temperature at an inlet of a catalyst of the SCR system.
Further, the policy further comprises: by increasing the working condition of difficult crystallization to correspond to NH3Storing NH in target MAP3And storing the target value to increase the urea injection amount for ammonia supplement so as to achieve the purpose of not influencing the emission.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
the invention can reduce the urea injection with low temperature and low exhaust flow as much as possible on the basis of meeting the emission requirement of an engine, and prevent the crystallization problem caused by uneven urea decomposition and poor mixing at low temperature and low flow.
Drawings
FIG. 1 is a control block diagram of a conventional technique;
fig. 2 is a control block diagram of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to FIG. 2, a strategy for correcting urea injection to prevent urea crystallization includes:
calculating exhaust energy according to the exhaust temperature and the exhaust flow, wherein the exhaust energy is the exhaust temperature and the exhaust flow/1000, the exhaust temperature is the exhaust gas temperature at the inlet of a catalyst of the SCR system, the exhaust flow is the exhaust gas flow of an engine, the urea crystallization rates under different urea injection quantities are calibrated according to the exhaust energy, and the urea crystallization rate MAP is obtained, and in the following table 1, S1-S57 show the urea crystallization rates under various working conditions; x represents the ratio of urea injection quantity to exhaust energy, and the crystallization rate under different urea injection quantities can be obtained by changing the X value test;
TABLE 1
Calculating to obtain the maximum urea injection amount under each working condition according to the urea crystallization rate MAP and the set urea crystallization rate, setting the urea crystallization rate to be less than 0.5g/h, namely obtaining the relation between the weight of urea crystals generated under different urea injection amounts and time through tests, and carrying out the constraint of the maximum urea injection amount by taking 0.5g/h as a limit line;
calibrating the maximum urea injection amount under each working condition to a urea injection limit MAP, as shown in Table 2 below, in Table 2, P1-P63 represent the maximum allowable urea crystal amount under each working condition as a urea injection control strategy for engine operation;
TABLE 2
Calculating to obtain required urea injection quantity according to actual exhaust flow, actual exhaust temperature and actual nitrogen oxide concentration when the engine actually runs, wherein the actual nitrogen oxide concentration is the concentration of NOx in tail gas of the engine;
inquiring the urea injection limit MAP according to the actual exhaust flow and the actual exhaust temperature to obtain the urea injection limit quantity;
and comparing the required urea injection quantity with the urea injection limiting quantity, taking a small value as an actual urea injection quantity, and controlling the SCR system to work according to the actual urea injection quantity.
The strategy further comprises: by increasing the working condition of difficult crystallization to correspond to NH3Storing NH in target MAP3And storing the target value to increase the urea injection amount for ammonia supplement so as to achieve the purpose of not influencing the emission.
The strategy takes the exhaust temperature and the exhaust flow which affect the urea crystallization as the most key control factors, identifies the effective injection control restriction requirement, forms an accurate calibration strategy, prevents the formation of the urea crystallization at low temperature and low flow in the strategy on the premise of ensuring the unchanged hardware configuration of the engine, and ensures that the emission of the engine is not influenced by the application of the ammonia storage strategy, thereby achieving the optimal performance matching and accurately solving the crystallization problem of the SCR system.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (4)
1. A strategy for correcting urea injection quantity to prevent urea crystallization, the strategy comprising:
calculating to obtain exhaust energy according to the exhaust temperature and the exhaust flow, calibrating urea crystallization rates under different urea injection quantities according to the exhaust energy, and obtaining a urea crystallization rate MAP;
calculating to obtain the maximum urea injection amount under each working condition according to the urea crystallization rate MAP and the set urea crystallization rate;
calibrating the maximum urea injection quantity under each working condition to a urea injection limit MAP;
calculating to obtain required urea injection quantity according to the actual exhaust flow, the actual exhaust temperature and the actual nitrogen oxide concentration when the engine actually runs;
inquiring the urea injection limit MAP according to the actual exhaust flow and the actual exhaust temperature to obtain urea injection limit quantity;
and comparing the required urea injection quantity with the urea injection limiting quantity, taking a small value as an actual urea injection quantity, and controlling the SCR system to work according to the actual urea injection quantity.
2. The strategy for correcting urea injection to prevent urea crystallization according to claim 1, wherein exhaust energy is exhaust temperature exhaust flow rate/1000.
3. The strategy for correcting urea injection to prevent urea crystallization according to claim 1, wherein the exhaust temperature is an exhaust gas temperature at an inlet of a catalyst of an SCR system.
4. The strategy for correcting urea injection quantity to prevent urea crystallization according to claim 1, further comprising: by increasing the working condition of difficult crystallization to correspond to NH3Storing NH in target MAP3And storing the target value to increase the urea injection amount for ammonia supplement so as to achieve the purpose of not influencing the emission.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113250800A (en) * | 2021-07-06 | 2021-08-13 | 南昌碳印环保科技有限公司 | Active control method for Urea crystallization risk of Urea-SCR system |
| CN113356988A (en) * | 2021-07-06 | 2021-09-07 | 南昌碳印环保科技有限公司 | Online diagnosis method for Urea crystallization risk of Urea-SCR system |
| CN113653552A (en) * | 2021-09-06 | 2021-11-16 | 安徽江淮汽车集团股份有限公司 | Urea injection control method of SCR system |
| CN114592953A (en) * | 2022-03-14 | 2022-06-07 | 潍柴动力股份有限公司 | Method, device and equipment for adjusting urea injection quantity of engine |
| CN114837780A (en) * | 2022-05-25 | 2022-08-02 | 潍柴动力股份有限公司 | Method for correcting urea injection quantity |
| CN115013130A (en) * | 2022-07-14 | 2022-09-06 | 东风商用车有限公司 | SCR catalyst urea crystallization amount calculation and crystallization removal system and method |
| CN115013125A (en) * | 2022-07-13 | 2022-09-06 | 江铃汽车股份有限公司 | Reducing agent pre-injection control strategy under emergency acceleration working condition |
| CN115126579A (en) * | 2022-06-29 | 2022-09-30 | 潍柴动力股份有限公司 | Urea injection amount control method and vehicle |
| CN115263498A (en) * | 2022-07-22 | 2022-11-01 | 东风汽车股份有限公司 | Method, recording medium and system for controlling urea crystallization in process of removing nitrogen oxides by adding urea into diesel vehicle |
| CN117189320A (en) * | 2023-10-31 | 2023-12-08 | 潍柴动力股份有限公司 | Urea injection control method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113250800A (en) * | 2021-07-06 | 2021-08-13 | 南昌碳印环保科技有限公司 | Active control method for Urea crystallization risk of Urea-SCR system |
| CN113356988A (en) * | 2021-07-06 | 2021-09-07 | 南昌碳印环保科技有限公司 | Online diagnosis method for Urea crystallization risk of Urea-SCR system |
| CN113356988B (en) * | 2021-07-06 | 2022-05-24 | 南昌碳印环保科技有限公司 | Online diagnosis method for Urea crystallization risk of Urea-SCR system |
| CN113653552A (en) * | 2021-09-06 | 2021-11-16 | 安徽江淮汽车集团股份有限公司 | Urea injection control method of SCR system |
| CN114592953A (en) * | 2022-03-14 | 2022-06-07 | 潍柴动力股份有限公司 | Method, device and equipment for adjusting urea injection quantity of engine |
| CN114837780A (en) * | 2022-05-25 | 2022-08-02 | 潍柴动力股份有限公司 | Method for correcting urea injection quantity |
| CN115126579A (en) * | 2022-06-29 | 2022-09-30 | 潍柴动力股份有限公司 | Urea injection amount control method and vehicle |
| CN115126579B (en) * | 2022-06-29 | 2024-01-02 | 潍柴动力股份有限公司 | Urea injection quantity control method and vehicle |
| CN115013125A (en) * | 2022-07-13 | 2022-09-06 | 江铃汽车股份有限公司 | Reducing agent pre-injection control strategy under emergency acceleration working condition |
| CN115013125B (en) * | 2022-07-13 | 2023-09-15 | 江铃汽车股份有限公司 | Reducing agent pre-injection control strategy under rapid acceleration working condition |
| CN115013130A (en) * | 2022-07-14 | 2022-09-06 | 东风商用车有限公司 | SCR catalyst urea crystallization amount calculation and crystallization removal system and method |
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