CN113153503A - SCR catalyst degradation test device and test method - Google Patents
SCR catalyst degradation test device and test method Download PDFInfo
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- CN113153503A CN113153503A CN202110462027.2A CN202110462027A CN113153503A CN 113153503 A CN113153503 A CN 113153503A CN 202110462027 A CN202110462027 A CN 202110462027A CN 113153503 A CN113153503 A CN 113153503A
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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
- 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
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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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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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
- 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
- F01N3/26—Construction of thermal 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
- 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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- 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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- 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
- F01N2560/07—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas flow rate or velocity meter or sensor, intake flow meters only when exclusively used to determine exhaust gas parameters
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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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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- 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 an SCR catalyst degradation test device which comprises a diesel engine, wherein the diesel engine is connected with an exhaust pipeline, an electric three-way valve is arranged on the outer side surface of the exhaust pipeline close to the diesel engine, a urea injection device is arranged behind the electric three-way valve, and an electric three-way valveAn exhaust flowmeter is arranged between the three-way valve and the urea injection device, a mixer is arranged behind the urea injection device, an electric heater is arranged on one side of the mixer, a catalytic device is arranged behind the mixer, and front NO is arranged in front of the exhaust flowmeterXSensor, catalytic device rear set with rear NOXThe SCR catalyst degradation testing device can accurately adjust the exhaust flow and truly reflect the treatment capacity of the SCR catalyst to the exhaust of the diesel engine.
Description
Technical Field
The invention relates to the technical field of diesel engine tests, in particular to a SCR catalyst degradation test device and a test method.
Background
The SCR technology is a selective catalytic reduction technology and is an aftertreatment technology used when diesel engines meet the requirements of relevant emission regulations. When the SCR system is certified by a classification society, the SCR catalyst is required to complete a degradation test at first, and the existing common method is to perform a data test by gas generated by a combustor, but the gas generated by the combustor cannot comprehensively reflect the exhaust gas of a diesel engine, so that the degradation test cannot well reflect the treatment capacity of the catalyst on the tail gas of the diesel engine.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an SCR catalyst degradation test device and a test method, which can accurately adjust the exhaust flow, truly reflect the treatment capacity of an SCR catalyst on diesel engine exhaust and effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a SCR catalyst degradation test device, includes the diesel engine, the diesel engine is connected with exhaust pipe, and the lateral surface that is close to the exhaust pipe of diesel engine is provided with electric three-way valve, installs urea injection apparatus behind the electric three-way valve, is provided with the exhaust flowmeter between electric three-way valve and the urea injection apparatus, installs the blender behind the urea injection apparatus, and one side of blender is provided with electric heater, is provided with catalytic unit behind the blender, is provided with preceding NO before the exhaust flowmeterXSensor, catalytic device rear set with rear NOXSensor, the electric heater is front and electricTemperature sensors are arranged behind the heating device and behind the catalytic device.
In a preferred embodiment of the present invention, the urea injection device includes a metering pump, a damper, and a spray gun.
As a preferable technical solution of the present invention, a bypass line is provided at one side of the exhaust line, and another electric three-way valve is provided at an outer side surface of the bypass line.
As a preferable technical solution of the present invention, an exhaust muffler is disposed at an outlet of the exhaust pipe.
As a preferable technical scheme of the invention, the temperature sensor, the exhaust gas flowmeter and the front NO areXSensor and post NOXThe output end of the sensor is electrically connected with the input end of an external controller, and the input ends of the electric three-way valve, the urea injection device, the electric heater and the catalytic device are electrically connected with the output end of the external controller.
A test method of an SCR catalyst degradation test device comprises the following steps:
s1: starting the diesel engine to a specific working condition, adjusting the flow entering the exhaust pipeline by the electric three-way valve, measuring the flow flowing through the catalytic device by the exhaust flowmeter, and passing through the front NOXSensor for detecting NO in exhaust gas from diesel engineXContent (c);
s2: injecting proper urea into the exhaust pipeline through a urea injection device, wherein the urea and the exhaust are fully mixed in a mixer;
s3: before mixed exhaust enters the catalytic device, the temperature of the exhaust passing through the catalytic device is measured through a temperature sensor, and if the exhaust temperature does not reach a preset standard, the exhaust passing through the catalytic device is heated to the preset standard by starting an electric heating device;
s4: after passing NOXThe sensor detects NO in the exhaust gas after catalytic reactionXAnd (4) content.
In a preferred embodiment of the present invention, the predetermined standard temperature of the catalyst is 550 ℃.
In a preferred embodiment of the present invention, the urea injection device has an injection quantity value of 500ml/h to 3000 ml/h.
As a preferable technical scheme of the invention, the catalyst in the catalytic device is a four-in-one package, the volume is 0.018m3, and the space velocity is 500001/h.
Compared with the prior art, the invention has the beneficial effects that: the SCR catalyst degradation test device and the test method have reasonable design and convenient operation, can accurately adjust the exhaust flow, truly reflect the processing capacity of the SCR catalyst to the exhaust of the diesel engine, heat the mixed gas by arranging the electric heater, ensure that the gas reaches the requirement of specific temperature before catalytic reduction, realize the accurate control of the temperature, realize the accurate measurement of the exhaust flow by arranging the exhaust flowmeter, ensure that the exhaust flow flowing through the catalytic device meets the requirement of space velocity 500001/h, and respectively arrange the front NO and the rear NO at the front and the rear of the catalytic deviceXSensor and post NOXThe sensor can fully embody the treatment capacity of the catalyst on the tail gas of the diesel engine and meet the requirement of fully reflecting the tail gas emission treatment of the diesel engine.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: referring to fig. 1, the present invention provides a technical solution: the utility model provides a SCR catalyst degradation test device, includes the diesel engine, and the diesel engine is connected with exhaust pipe, and the lateral surface that is close to the exhaust pipe of diesel engine is provided with electronic three-way valve, installs urea injection apparatus behind the electronic three-way valve, and one side of exhaust pipe is provided with the bypass line, and the lateral surface of bypass line is provided with another electronic three-way valve, and the setting of bypass line is convenient for control when experimentalAdmit air and detect flow for it is experimental more accurate, urea injection apparatus includes measuring pump, attenuator and spray gun, be provided with the exhaust flowmeter between electric three-way valve and the urea injection apparatus, install the blender behind the urea injection apparatus, one side of blender is provided with electric heater, be provided with catalytic unit behind the blender, catalyst is a four unification encapsulation among the catalytic unit, volume 0.018m3, airspeed 500001/h, NO before being provided with before the exhaust flowmeterXSensor, catalytic device rear set with rear NOXThe sensor, all be provided with temperature sensor before the electric heater unit, behind the electric heater unit and behind the catalytic unit, exhaust pipe outlet department is provided with the exhaust muffler, the vibration when exhaust can be reduced in the setting of exhaust muffler, noise pollution abatement, temperature sensor, exhaust flowmeter, preceding NOXSensor and post NOXThe output end of the sensor is electrically connected with the input end of an external controller, the input ends of the electric three-way valve, the urea injection device, the electric heater and the catalytic device are electrically connected with the output end of the external controller,
a test method of an SCR catalyst degradation test device comprises the following steps:
s1: starting the diesel engine to a specific working condition, adjusting the flow entering the exhaust pipeline by the electric three-way valve, and measuring the exhaust flow 900m by the exhaust flowmeter for the flow flowing through the catalytic device3By pre-NOXSensor for detecting NO in exhaust gas from diesel engineXThe content is 0.42kg/m3；
S2: spraying 1200ml/h of urea into an exhaust pipeline through a urea spraying device, wherein the urea and the exhaust gas are fully mixed in a mixer;
s3: before mixed exhaust enters a catalytic device, measuring the temperature of the exhaust passing through the catalytic device through a temperature sensor, and if the exhaust temperature does not reach the preset standard 550 ℃, heating the exhaust passing through the catalytic device to 550 ℃ by starting an electric heating device;
s4: after passing NOXThe sensor detects NO in the exhaust gas after catalytic reactionXThe content is 0.16kg/m3。
The data show that the NOx conversion efficiency reaches 56%, which shows that the device has good treatment effect on NOx.
Example 2: a test method of an SCR catalyst degradation test device comprises the following steps:
s1: starting the diesel engine to a specific working condition, adjusting the flow entering the exhaust pipeline by the electric three-way valve, and measuring the exhaust flow 900m by the exhaust flowmeter for the flow flowing through the catalytic device3By pre-NOXSensor for detecting NO in exhaust gas from diesel engineXThe content is 0.5kg/m3；
S2: spraying 500ml/h of urea into an exhaust pipeline through a urea spraying device, wherein the urea and the exhaust gas are fully mixed in a mixer;
s3: before mixed exhaust enters a catalytic device, measuring the temperature of the exhaust passing through the catalytic device through a temperature sensor, and if the exhaust temperature does not reach the preset standard 550 ℃, heating the exhaust passing through the catalytic device to 550 ℃ by starting an electric heating device;
s4: after passing NOXThe sensor detects NO in the exhaust gas after catalytic reactionXThe content is 0.22kg/m3。
The data show that the NOx conversion efficiency reaches 62%, which shows that the device has good treatment effect on NOx.
Comparative example: by introducing 900m into the burner3After combustion of the gas, the same urea injection device and catalytic device as in example 1 were used, and NO measured before exhaustXThe content is 0.8kg/m3NO detected after exhaust after combustionXThe content is 0.6kg/m3。
And (4) conclusion: in the comparative example, the gas generated by the burner is catalytically reduced to achieve a NOx conversion efficiency of 25%, so that the gas generated by the burner does not completely reflect the treatment capacity of the catalyst for the diesel exhaust.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An SCR catalyst deterioration test device, includes the diesel engine, its characterized in that: the diesel engine is connected with the exhaust pipe, and the lateral surface that is close to the exhaust pipe of diesel engine is provided with electronic three-way valve, installs urea injection apparatus behind the electronic three-way valve, is provided with the exhaust flowmeter between electronic three-way valve and the urea injection apparatus, installs the blender behind the urea injection apparatus, and one side of blender is provided with electric heater, is provided with catalytic unit behind the blender, is provided with preceding NO before the exhaust flowmeterXSensor, catalytic device rear set with rear NOXAnd the sensors are arranged in front of the electric heating device, behind the electric heating device and behind the catalytic device.
2. The SCR catalyst degradation test apparatus according to claim 1, characterized in that: the urea injection device comprises a metering pump, a damper and a spray gun.
3. The SCR catalyst degradation test apparatus according to claim 1, characterized in that: and a bypass pipeline is arranged on one side of the exhaust pipeline, and the outer side surface of the bypass pipeline is provided with another electric three-way valve.
4. The SCR catalyst degradation test apparatus according to claim 1, characterized in that: and an exhaust silencer is arranged at the outlet of the exhaust pipeline.
5. The SCR catalyst degradation test apparatus according to claim 1, characterized in that: the temperature sensor, the exhaust gas flowmeter, and the pre-NOXSensor and post NOXThe output end of the sensor is electrically connected with the input end of an external controller, and the input ends of the electric three-way valve, the urea injection device, the electric heater and the catalytic device are electrically connected with the output end of the external controller.
6. A test method of the SCR catalyst degradation test apparatus according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1: starting the diesel engine to a specific working condition, adjusting the flow entering the exhaust pipeline by the electric three-way valve, measuring the flow flowing through the catalytic device by the exhaust flowmeter, and passing through the front NOXSensor for detecting NO in exhaust gas from diesel engineXContent (c);
s2: injecting proper urea into the exhaust pipeline through a urea injection device, wherein the urea and the exhaust are fully mixed in a mixer;
s3: before mixed exhaust enters the catalytic device, the temperature of the exhaust passing through the catalytic device is measured through a temperature sensor, and if the exhaust temperature does not reach a preset standard, the exhaust passing through the catalytic device is heated to the preset standard by starting an electric heating device;
s4: after passing NOXThe sensor detects NO in the exhaust gas after catalytic reactionXAnd (4) content.
7. The method of testing an SCR catalyst degradation test apparatus according to claim 6, characterized in that: the predetermined standard temperature for flow through the catalytic device was 550 ℃.
8. The method of testing an SCR catalyst degradation test apparatus according to claim 6, characterized in that: the injection quantity value of the urea injection device is between 500ml/h and 3000 ml/h.
9. The method of testing an SCR catalyst degradation test apparatus according to claim 6, characterized in that: the catalyst in the catalytic device is packaged in a four-in-one way, the volume is 0.018m3, and the space velocity is 500001/h.
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| CN207064046U (en) * | 2017-06-07 | 2018-03-02 | 蚌埠学院 | A kind of diesel SCR bench test device that can control catalytic reaction temperature |
| CN208255158U (en) * | 2018-03-26 | 2018-12-18 | 上海倍绿环保科技有限公司 | Low-temperature SCR catalyst test device in diesel engine |
| CN110160795A (en) * | 2019-05-27 | 2019-08-23 | 武汉东测科技有限责任公司 | A kind of exhaust treatment system and its test method of gasoline engine machine frame |
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2021
- 2021-04-27 CN CN202110462027.2A patent/CN113153503A/en active Pending
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|---|---|---|---|---|
| CN102095587A (en) * | 2010-12-17 | 2011-06-15 | 杭州银轮科技有限公司 | Simulation test bed used for engine exhaust aftertreatment device |
| CN106404402A (en) * | 2016-09-09 | 2017-02-15 | 浙江大学 | Diesel engine full-dimension SCR catalytic reactor performance test platform based on tail gas simulation |
| CN206523481U (en) * | 2017-02-26 | 2017-09-26 | 上海倍绿环保科技有限公司 | Ship SCR reactors quick aging and testing stand for performance test device |
| CN207064046U (en) * | 2017-06-07 | 2018-03-02 | 蚌埠学院 | A kind of diesel SCR bench test device that can control catalytic reaction temperature |
| CN208255158U (en) * | 2018-03-26 | 2018-12-18 | 上海倍绿环保科技有限公司 | Low-temperature SCR catalyst test device in diesel engine |
| CN110160795A (en) * | 2019-05-27 | 2019-08-23 | 武汉东测科技有限责任公司 | A kind of exhaust treatment system and its test method of gasoline engine machine frame |
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