CN113027574A - Method and device for accurately measuring temperature of SCR (Selective catalytic reduction) catalytic unit - Google Patents
Method and device for accurately measuring temperature of SCR (Selective catalytic reduction) catalytic unit Download PDFInfo
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- CN113027574A CN113027574A CN202110360062.3A CN202110360062A CN113027574A CN 113027574 A CN113027574 A CN 113027574A CN 202110360062 A CN202110360062 A CN 202110360062A CN 113027574 A CN113027574 A CN 113027574A
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 26
- 239000003054 catalyst Substances 0.000 claims description 23
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- 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
- F01N13/008—Mounting or arrangement of exhaust sensors in or on 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a method and a device for accurately measuring the temperature of an SCR (selective catalytic reduction) catalytic unit, relates to the technical field of engine tail gas treatment, and solves the technical problem of inaccurate temperature measurement of the SCR catalytic unit, and the method comprises the following steps: in an experimental environment, acquiring the temperature T of the front end of an SCR catalytic unit; acquiring temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit; acquiring the temperature Tn +1 of the central position of the middle part of the SCR catalytic unit; adjusting the working condition of the engine according to a set temperature interval, gradually increasing the temperature T from a first temperature to a second temperature, stably operating for a set time at each working condition point, respectively recording T, T1-Tn and Tn +1 corresponding to each working condition point after the set time is reached, and calculating a correction coefficient lambda (T1+ · + Tn + Tn +1)/(n +1) T corresponding to each working condition point; making a correction curve according to the correction coefficient lambda corresponding to each working condition point; in actual work, the actual temperature of the SCR catalytic unit is obtained by inquiring the correction curve according to the actual temperature at the front end of the SCR catalytic unit.
Description
Technical Field
The invention relates to the technical field of engine tail gas treatment, in particular to a method and a device for accurately measuring the temperature of an SCR (selective catalytic reduction) catalytic unit.
Background
The diesel engine with the SCR (selective catalytic reduction) system optimizes the emission of CO, HC, PM and the like to be within the limit value of the regulation through the technical means of internal purification, for the NOx emission exceeding the limit value of the regulation, the SCR system is adopted to spray the urea amount matched with the operation working condition of the engine into an exhaust pipe through a control unit, the ammonia and the nitrogen oxide decomposed from the urea are subjected to catalytic reduction reaction in a catalyst to finally generate harmless nitrogen (N2) and water (H2O) to reduce the NOx emission, and finally the NOx emission meets the requirement of the regulation. The main chemical reaction modes are as follows:
NO+NO2+2NH3->2N2+3H2O；
4NO+O2+4NH3->4N2+6H2O；
2NO2+O2+4NH3->3N2+6H2O；
while the reaction efficiency of the SCR (selective catalytic reduction) system is directly related to the temperature of the catalyst carrier, the reaction rate change of the SCR system along with the change of the temperature is shown in fig. 1, and in the practical application process, the temperature field of the SCR carrier section is not uniformly distributed.
In the prior art, an intelligent temperature sensor is generally arranged in front of and behind a catalyst, and the structure of the intelligent temperature sensor is shown in fig. 2, a urea nozzle C is arranged on an exhaust pipe B in front of an SCR catalyst housing a, and a front NOx sensor E, SCR, a front NOx sensor F, SCR, a rear NOx sensor G, SCR and a rear temperature sensor H are respectively arranged in the SCR catalyst housing a at the front and rear ends of a catalytic unit D. Then the arithmetic mean value of the rear temperature sensor H of the SCR front temperature sensor E, SCR is used as the carrier temperature of the SCR catalyst, which has the main disadvantage that the temperature measurement in some configuration cases is inaccurate and the efficiency of the catalyst cannot be fully utilized due to the influence of the diameter of the carrier of the catalyst and the length of the temperature sensor.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide a method for accurately measuring the temperature of an SCR catalytic unit, which can improve the measurement precision.
The invention also aims to provide a device for accurately measuring the temperature of the SCR catalytic unit, which can improve the measurement precision.
In order to achieve the above object, the present invention provides a method for accurately measuring the temperature of an SCR catalytic unit, comprising:
in an experimental environment, acquiring the temperature T of the front end of an SCR catalytic unit; acquiring temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit; acquiring the temperature Tn +1 of the central position of the middle part of the SCR catalytic unit;
adjusting the working condition of the engine according to a set temperature interval, so that the temperature T is gradually increased from a first temperature to a second temperature, stably operating for a set time at each working condition point, respectively recording T, T1-Tn and Tn +1 corresponding to each working condition point after the set time is reached, and calculating a correction coefficient lambda (T1+ · + Tn + Tn +1)/(n +1) T corresponding to each working condition point;
making a correction curve according to the correction coefficient lambda corresponding to each working condition point;
in actual work, the correction curve is inquired according to the actual temperature of the front end of the SCR catalytic unit to obtain the actual working temperature of the SCR catalytic unit.
As a further refinement, the n different locations are arranged uniformly around the axis of the SCR catalytic unit.
Furthermore, the distances between the n different positions and the outer edge of the SCR catalytic unit are 10-30 mm.
Further, the first temperature is 150-180 ℃, and the second temperature is 650-680 ℃.
Further, the set temperature interval is 20-30 ℃, and the set time is 10-20 min.
In order to achieve the second purpose, the invention provides a device for accurately measuring the temperature of an SCR catalytic unit, which comprises an SCR catalyst shell, wherein the SCR catalyst shell is internally provided with the SCR catalytic unit, and the device is characterized by also comprising a controller, wherein an SCR front temperature sensor is arranged in the SCR catalyst shell at the front end of the SCR catalytic unit, n first temperature sensors which are axially arranged are inserted and arranged on the periphery of the SCR catalytic unit, a second temperature sensor is inserted and arranged on the axial lead of the SCR catalytic unit, and the controller is electrically connected with the SCR front temperature sensor, the first temperature sensor and the second temperature sensor;
in an experimental environment, the controller acquires the temperature T at the front end of the SCR catalytic unit through the pre-SCR temperature sensor, acquires the temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit through the first temperature sensor, acquires the temperature Tn +1 of the center position of the middle part of the SCR catalytic unit through the second temperature sensor, and formulates a correction curve according to the method;
in actual work, the controller queries the correction curve according to the actual temperature at the front end of the SCR catalytic unit to obtain the actual working temperature of the SCR catalytic unit.
As a further improvement, n is more than or equal to 3, and the n first temperature sensors are uniformly arranged around the axial lead of the SCR catalytic unit.
Furthermore, the distances between the n first temperature sensors and the outer edge of the SCR catalytic unit are 10-30 mm.
Further, the depth of insertion of the n first temperature sensors is 1/2 times the length of the SCR catalytic unit.
Further, the depth of insertion of the second temperature sensor is 1/2 the length of the SCR catalytic unit.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
according to the invention, n first temperature sensors are arranged on the periphery of the SCR catalytic unit, a second temperature sensor is arranged on the axis line of the SCR catalytic unit, and the average number of the measured values of the n first temperature sensors and the second temperature sensor can accurately reflect the temperature of the catalytic unit; after the correction curve is formulated, in actual work, only the temperature sensor before the SCR is reserved, the production cost and the use cost of a user can be effectively reduced, the actual temperature of the work of the SCR catalytic unit is obtained according to the measured value query correction curve of the temperature sensor before the SCR, the temperature of a catalyst carrier can be accurately reflected, the maximum efficiency of the catalyst is fully utilized, the economy of an engine is improved, meanwhile, over-spraying is reduced, the crystallization risk is reduced, and the use operation efficiency of the user is improved.
Drawings
FIG. 1 is a graph of the reaction rate of an SCR system as a function of temperature;
FIG. 2 is a schematic structural diagram of a conventional technique;
FIG. 3 is a schematic structural view of the present invention;
fig. 4 is a sectional view taken along line I-I of fig. 3.
Wherein: the device comprises a 1-SCR catalytic unit, a 2-SCR catalytic device shell, a 3-SCR front temperature sensor, a 4-first temperature sensor and a 5-second temperature sensor.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 3 and 4, a method for accurately measuring the temperature of an SCR catalytic unit includes:
in an experimental environment, acquiring the temperature T of the front end of the SCR catalytic unit 1; acquiring temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit 1; acquiring the temperature Tn +1 of the central position of the middle part of the SCR catalytic unit 1;
adjusting the working condition of the engine according to a set temperature interval, gradually increasing the temperature T from a first temperature to a second temperature, stably operating for a set time at each working condition point, respectively recording T, T1-Tn and Tn +1 corresponding to each working condition point after the set time is reached, and calculating a correction coefficient lambda (T1+ · + Tn + Tn +1)/(n +1) T corresponding to each working condition point;
making a correction curve according to the correction coefficient lambda corresponding to each working condition point;
in actual work, the actual temperature of the SCR catalytic unit 1 is obtained by inquiring the correction curve according to the actual temperature at the front end of the SCR catalytic unit 1.
The n different positions are uniformly arranged around the axial lead of the SCR catalytic unit 1, so that the temperature of the periphery of the whole SCR catalytic unit 1 can be fully reflected, the distances between the n different positions and the outer edge of the SCR catalytic unit 1 are 10-30 mm, and the influence of the heat dissipation of the outer edge of the SCR catalytic unit 1 on temperature measurement can be reduced.
Preferably, the first temperature is 150 ℃ to 180 ℃, and the second temperature is 650 ℃ to 680 ℃. The set temperature interval is 20-30 ℃, the set time is 10-20 min, and the temperature of each working condition point can be fully and uniformly conducted to the whole SCR catalytic unit 1.
The device for accurately measuring the temperature of the SCR catalytic unit comprises an SCR catalyst shell 2, an SCR catalytic unit 1 is installed in the SCR catalyst shell 2, the device further comprises a controller, a SCR front temperature sensor 3 is arranged in the SCR catalyst shell 2 at the front end of the SCR catalytic unit 1, n first temperature sensors 4 which are axially arranged are inserted in the periphery of the SCR catalytic unit 1, a second temperature sensor 5 is inserted in the axial lead of the SCR catalytic unit 1, and the controller is electrically connected with the SCR front temperature sensor 3, the first temperature sensors 4 and the second temperature sensors 5;
in an experimental environment, the controller acquires the temperature T at the front end of the SCR catalytic unit 1 through the SCR front temperature sensor 3, acquires the temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit 1 through the first temperature sensor 4, acquires the temperature Tn +1 of the center position of the middle part of the SCR catalytic unit 1 through the second temperature sensor 5, and formulates a correction curve according to the method;
in actual work, the controller queries the correction curve according to the actual temperature at the front end of the SCR catalytic unit 1 to obtain the actual working temperature of the SCR catalytic unit 1.
n is more than or equal to 3, the n first temperature sensors 4 are uniformly arranged around the axial lead of the SCR catalytic unit 1, and the distances between the n first temperature sensors 4 and the outer edge of the SCR catalytic unit 1 are 10-30 mm.
The insertion depth of the n first temperature sensors 4 is 1/2 of the length of the SCR catalytic unit 1, the insertion depth of the second temperature sensor 5 is 1/2 of the length of the SCR catalytic unit 1, and the temperature of the middle part of the SCR catalytic unit 1 can further represent the temperature of the whole SCR catalytic unit 1.
According to the invention, n first temperature sensors are arranged on the periphery of the SCR catalytic unit, a second temperature sensor is arranged on the axis line of the SCR catalytic unit, and the average number of the measured values of the n first temperature sensors and the second temperature sensor can accurately reflect the temperature of the catalytic unit; after the correction curve is formulated, in actual work, only the temperature sensor before the SCR is reserved, the production cost and the use cost of a user can be effectively reduced, the actual temperature of the work of the SCR catalytic unit is obtained according to the measured value query correction curve of the temperature sensor before the SCR, the temperature of a catalyst carrier can be accurately reflected, the maximum efficiency of the catalyst is fully utilized, the economy of an engine is improved, meanwhile, over-spraying is reduced, the crystallization risk is reduced, and the use operation efficiency of the user is improved.
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 (10)
1. A method of accurately measuring the temperature of an SCR catalytic unit, comprising:
in an experimental environment, acquiring the temperature T of the front end of an SCR catalytic unit (1); acquiring temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit (1); acquiring the temperature Tn +1 of the central position of the middle part of the SCR catalytic unit (1);
adjusting the working condition of the engine according to a set temperature interval, so that the temperature T is gradually increased from a first temperature to a second temperature, stably operating for a set time at each working condition point, respectively recording T, T1-Tn and Tn +1 corresponding to each working condition point after the set time is reached, and calculating a correction coefficient lambda (T1+ · + Tn + Tn +1)/(n +1) T corresponding to each working condition point;
making a correction curve according to the correction coefficient lambda corresponding to each working condition point;
in actual work, the correction curve is inquired according to the actual temperature of the front end of the SCR catalytic unit (1) to obtain the actual working temperature of the SCR catalytic unit (1).
2. A method for accurate measurement of the temperature of an SCR catalytic unit according to claim 1, characterized in that the n different locations are evenly arranged around the axis of the SCR catalytic unit (1).
3. A method for accurate measurement of the temperature of an SCR catalytic unit according to claim 1, characterized in that the distance of the n different locations to the outer edge of the SCR catalytic unit (1) is 10mm to 30 mm.
4. The method of claim 1, wherein the first temperature is 150 ℃ to 180 ℃ and the second temperature is 650 ℃ to 680 ℃.
5. The method for accurately measuring the temperature of the SCR catalytic unit as recited in claim 1, wherein the set temperature interval is 20 ℃ to 30 ℃ and the set time is 10min to 20 min.
6. The device for accurately measuring the temperature of the SCR catalytic unit comprises an SCR catalyst shell (2), wherein the SCR catalytic unit (1) is installed in the SCR catalyst shell (2), and is characterized by further comprising a controller, wherein a SCR front temperature sensor (3) is arranged in the SCR catalyst shell (2) at the front end of the SCR catalytic unit (1), n first temperature sensors (4) which are axially arranged are inserted and arranged on the periphery of the SCR catalytic unit (1), a second temperature sensor (5) is inserted and arranged at the axial lead of the SCR catalytic unit (1), and the controller is electrically connected with the SCR front temperature sensor (3), the first temperature sensor (4) and the second temperature sensor (5);
in an experimental environment, the controller acquires the temperature T at the front end of the SCR catalytic unit (1) through the SCR front temperature sensor (3), acquires the temperatures T1-Tn of n different positions on the periphery of the circumference of the middle part of the SCR catalytic unit (1) through the first temperature sensor (4), acquires the temperature Tn +1 of the center position of the middle part of the SCR catalytic unit (1) through the second temperature sensor (5), and makes a correction curve according to the method of claim 1;
in actual work, the controller queries the correction curve according to the actual temperature of the front end of the SCR catalytic unit (1) to obtain the actual working temperature of the SCR catalytic unit (1).
7. The device for accurately measuring the temperature of the SCR catalytic unit as recited in claim 6, wherein n is more than or equal to 3, and the n first temperature sensors (4) are uniformly arranged around the axial lead of the SCR catalytic unit (1).
8. The device for accurately measuring the temperature of the SCR catalytic unit as recited in claim 6, characterized in that the distance between the n first temperature sensors (4) and the outer edge of the SCR catalytic unit (1) is 10-30 mm.
9. An arrangement for accurate measurement of the temperature of an SCR catalytic unit according to claim 6, characterized in that the depth of insertion of the n first temperature sensors (4) is 1/2 of the length of the SCR catalytic unit (1).
10. An arrangement for accurate measurement of the temperature of an SCR catalyst unit according to claim 6, characterized in that the depth of insertion of the second temperature sensor (5) is 1/2 of the length of the SCR catalyst unit (1).
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| CN202110360062.3A CN113027574B (en) | 2021-04-02 | 2021-04-02 | Method and device for accurately measuring temperature of SCR (selective catalytic reduction) catalytic unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607495A (en) * | 2022-03-21 | 2022-06-10 | 潍柴动力股份有限公司 | Method and device for determining concentration of nitrogen oxide, electronic equipment and storage medium |
| CN117989005A (en) * | 2024-03-04 | 2024-05-07 | 湖南道依茨动力有限公司 | Method and device for determining ignition temperature of catalytic oxidizer and electronic equipment |
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| CN117989005A (en) * | 2024-03-04 | 2024-05-07 | 湖南道依茨动力有限公司 | Method and device for determining ignition temperature of catalytic oxidizer and electronic equipment |
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| CN113027574B (en) | 2023-12-19 |
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