CN107143404B - Emission reduction performance test system of combined post-processor of diesel engine - Google Patents
Emission reduction performance test system of combined post-processor of diesel engine Download PDFInfo
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- CN107143404B CN107143404B CN201710261194.4A CN201710261194A CN107143404B CN 107143404 B CN107143404 B CN 107143404B CN 201710261194 A CN201710261194 A CN 201710261194A CN 107143404 B CN107143404 B CN 107143404B
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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
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
- F01N13/1844—Mechanical joints
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N3/2046—Periodically cooling catalytic reactors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Testing Of Engines (AREA)
Abstract
The invention relates to an emission reduction performance test system of a combined post-processor of a diesel engine, which comprises at least two paths of exhaust pipelines which are connected in parallel and are arranged in a shunting way, wherein the head end of each path of exhaust pipeline is respectively connected with an exhaust pipe of the diesel engine through a manual butterfly valve, the rear end of the manual butterfly valve in each path of exhaust pipeline comprises a plurality of post-processors which are sequentially connected in series, an exhaust sampling hole is respectively arranged between the head end post-processing air inlet end, the tail end post-processor air outlet end and two adjacent post-processors, the exhaust sampling holes are respectively connected to a gas detection device through one path of independent exhaust sampling pipelines, and the exhaust sampling pipelines are connected with an exhaust sampling control unit which is used for communicating the only one path of exhaust sampling pipeline with the gas detection device at a certain moment. Compared with the prior art, the invention can realize simultaneous testing of multiple schemes, and meanwhile, only one gas detection device is needed to realize gas detection at a plurality of exhaust sampling holes, so that the experimental efficiency is high, and strict analysis of emission reduction performance is realized.
Description
Technical Field
The invention relates to the field of emission reduction performance detection of a diesel engine postprocessor, in particular to an emission reduction performance test system of a diesel engine combined postprocessor.
Background
Five emission standards of diesel vehicles were first implemented in the eastern 11 provinces of China in the year 2016, and the national implementation will be comprehensive in 2017. The Ministry of environmental protection released six emission standards of light vehicles in the year 2016 and the emission standards of heavy vehicles were completed.
The use of simple post-processors has not met stringent emissions regulations and multiple post-processors must be used in series combinations, so that analysis of emissions after multiple post-processors are combined in series would be an important component of engine bench testing. Aiming at different structural parameters of different processors and different noble metal coating amounts of different processors, a plurality of combination schemes can be generated, and each combination scheme needs to analyze the emission condition before and after each processor, so that a combination mode with the best emission reduction effect is obtained.
If multiple sets of detection equipment are used, the respective calibration errors of different detection equipment can bring about poor consistency of analysis results of different measurement points, the multiple sets of detection equipment are expensive, and the cost is also difficult.
Meanwhile, in order to study a combination scheme with the best emission reduction performance when a plurality of post-processors are combined in series, after a single test is finished, the post-processor of the next scheme is installed after the post-processor is disassembled, and as the exhaust temperature is above 300 ℃, workers need to wait for cooling and then operate when the post-processor is disassembled, and the waste of human resources and time is caused by waiting for natural cooling of the post-processor, and the risk is high.
In the prior research results, a parallel sampling system of post-processors has been proposed, but only the emission of a single post-processor can be analyzed, the emission before and after the single post-processor after a plurality of post-processors are connected in series can not be analyzed at the same time, and the emission reduction performance analysis scheme under stricter emission regulations can not be satisfied; and the patent relates to a rapid cooling aftertreatment device for a diesel engine bench, which has long test time and low test efficiency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a diesel engine combined type post-processor emission reduction performance test system.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a diesel engine combination formula aftertreatment ware emission reduction performance test system, this system includes the exhaust pipe that two way at least parallelly connected shunts set up, and every way exhaust pipe head end is respectively through manual butterfly valve connection diesel engine blast pipe, and manual butterfly valve rear end in every way exhaust pipe all is equipped with an exhaust sampling hole including a plurality of aftertreatment ware of serial connection in proper order between head end aftertreatment inlet end, terminal aftertreatment ware end and two adjacent aftertreatment ware respectively, the exhaust sampling hole be connected to gas detection device through independent exhaust sampling pipeline all the way respectively, the exhaust sampling pipeline be connected with and be used for at a certain moment with the exhaust sampling control unit of only exhaust sampling pipeline intercommunication gas detection device all the way.
The air inlet end of the head end postprocessor and the air outlet end of the tail end postprocessor are connected to corresponding exhaust pipelines through connecting pipes, adjacent postprocessors are also connected with each other through corresponding connecting pipes, and exhaust sampling holes are respectively formed in the corresponding connecting pipes.
The connecting pipe pass through connecting device and fix, connecting device include base, backup pad and clamp be equipped with 2 respectively, the clamp set up both ends about the base through backup pad symmetry respectively, the connecting pipe be on a parallel with the base setting and both ends are fixed through the clamp respectively.
The clamp include hoop and snap ring, the hoop be one end and be equipped with open-ended annular structure, the snap ring set up a plurality of and along hoop inner wall evenly distributed, the hoop open end is equipped with two parallel arrangement's butt joint board, the butt joint board on the symmetry set up the fixed orifices that is used for the bolt fastening.
The post-processor comprises an oxidation catalytic converter, a catalytic continuous regeneration particle catcher and a selective catalytic reduction catalyst which are connected in sequence.
The exhaust sampling control unit comprises a plurality of electric control valves and a first controller which is respectively connected with the electric control valves.
The system also includes a rapid cooling device including a liquid nitrogen injector, one for each post-processor in each exhaust line.
The quick cooling device comprises vacuum heat-insulating pipes, one vacuum heat-insulating pipe is respectively arranged between two adjacent exhaust pipelines, the vacuum heat-insulating pipes are connected to a liquid nitrogen tank through a main control valve, a plurality of injector mounting ports are formed in the vacuum heat-insulating pipes, and liquid spraying nitrogen injectors are mounted on the injector mounting ports at corresponding positions of the postprocessor during testing.
The liquid nitrogen injector comprises two injection ports, the injection ports are distributed in a splayed shape and are arranged towards the post-processor, the injection ports are provided with liquid nitrogen injector automatic control valves, and the liquid nitrogen injector automatic control valves are connected to a liquid nitrogen injection automatic control unit.
The liquid nitrogen injection automatic control unit comprises an infrared temperature detector, a flow sensor and a second controller, wherein the flow sensor is arranged at the output end of the exhaust pipe of the diesel engine, the infrared temperature detector is arranged near a front end post-processor in each exhaust pipeline, the infrared temperature detector and the flow sensor are connected to the second controller, and the second controller is connected with the liquid nitrogen injector automatic control valve.
Compared with the prior art, the invention has the following advantages:
(1) The invention is provided with at least two paths of exhaust pipelines which are connected in parallel and shunted, is convenient for researching the test research of the combination scheme with the optimal emission reduction performance when a plurality of post-processors are connected in series and used, can realize single test detection of a plurality of sets of combination schemes, and has high efficiency;
(2) According to the invention, an exhaust sampling hole is respectively arranged between the head end post-treatment air inlet end, the tail end post-treatment air outlet end and two adjacent post-processors, the exhaust sampling hole is connected to a gas detection device through an exhaust sampling pipeline, and meanwhile, the independent collection and detection of the air at the air inlet end and the air outlet end of a single post-processor are realized through an exhaust sampling control unit, so that the detection of a plurality of detection points can be realized by only one gas detection device, and the strict analysis of the emission reduction performance is realized;
(3) The connecting pipes are fixed through the connecting device, so that the stability of the system structure is ensured, meanwhile, the connecting pipes can be increased according to the needs, the number of the post-processors is further increased, the emission reduction performance of the combined post-processor with different schemes can be conveniently analyzed according to actual conditions, and the universality is strong;
(4) According to the invention, the liquid nitrogen injectors are respectively arranged for each postprocessor, so that the postprocessors can be rapidly cooled, the potential safety hazard is reduced, the waste of resources and time is avoided, and the test efficiency is improved;
(5) According to the invention, the vacuum heat-insulating pipe is used for conveying liquid nitrogen, and the vacuum heat-insulating pipe is provided with the plurality of injector mounting ports, so that the installation and the arrangement of the liquid nitrogen injectors can be conveniently carried out according to the experiment requirements, and the experiment is convenient;
(6) According to the invention, whether gas is discharged from the output end of the exhaust pipe of the diesel engine is detected by the flow sensor, and meanwhile, the temperature of the front end post-processor in each path of exhaust pipeline is measured by the temperature sensor, when no gas is discharged by the flow sensor, and the temperature of the front end post-processor in each path of exhaust pipeline is higher than a set value, the liquid nitrogen injector automatic control valve in the corresponding exhaust pipeline is controlled to open the post-processor to inject liquid nitrogen for rapid cooling, so that the mode realizes automatic control, reduces manual participation, and realizes effective cooling while saving energy.
Drawings
FIG. 1 is a schematic diagram of an exhaust pipeline according to embodiment 1;
FIG. 2 is a schematic view of the structure of the connecting device of the present invention;
FIG. 3 is a schematic diagram of an exhaust pipeline with an exhaust sampling control unit according to embodiment 1;
FIG. 4 is a schematic diagram of the exhaust pipeline structure with a rapid cooling device in example 1;
fig. 5 is a schematic diagram showing a specific structure of the rapid cooling apparatus of embodiment 1;
FIG. 6 is a flow chart showing the operation of the rapid cooling apparatus of example 1;
FIG. 7 is a schematic view of the structure of an exhaust pipe with a rapid cooling device according to embodiment 2;
fig. 8 is a schematic diagram of an exhaust pipe structure including an exhaust sampling control unit according to embodiment 2.
In the figure, 111 and 112 are manual butterfly valves, 12 are three-way pipes, 131 are first oxidation catalytic converters, 132 are second oxidation catalytic converters, 133 are second catalytic continuous regeneration particle traps, 134 are second selective catalytic reduction catalysts, 135 are first selective catalytic reduction catalysts, 136 are first catalytic continuous regeneration particle traps, 14 are connecting devices, 151, 152, 153, 154, 155, 156, 157 and 158 are connecting pipes, 161, 162, 163, 164, 165, 166, 167 and 168 are exhaust sampling holes, 171 and 172 are exhaust pipelines, 141 are clamping rings, 142 are supporting plates, 143 are bases, 144 are butt plates, 145 are hoops, 21 and 22 are exhaust sampling pipelines, 221 are first electric control three-way valves, 222 are second electric control three-way valves, 223 are third electric control three-way valves, 231 are first electric control four-way valves, 232 are second electric control four-way valves, 24 are gas detection devices, 25 are ECUs, 311, 312, 313, liquid nitrogen, 314 and 316 are liquid nitrogen ejectors, 32 are master control valves, 33 are vacuum ejectors, and 33 are vacuum ejectors are 37, and the vacuum ejectors are installed, and the flow rate of the vacuum ejectors are controlled by the vacuum ejectors are 37.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Example 1
As shown in fig. 1, a diesel engine combined type post-processor emission reduction performance test system comprises at least two paths of exhaust pipelines which are connected in parallel and are arranged, the head end of each path of exhaust pipeline is respectively connected with a diesel engine exhaust pipe through a manual butterfly valve, the rear end of each path of manual butterfly valve in each path of exhaust pipeline comprises a plurality of post-processors which are sequentially connected in series, an exhaust sampling hole is respectively arranged between the head end post-processing air inlet end, the tail end post-processor air outlet end and two adjacent post-processors, the exhaust sampling holes are respectively connected to a gas detection device 24 through one path of independent exhaust sampling pipelines, and the exhaust sampling pipelines are connected with an exhaust sampling control unit which is used for communicating the only path of exhaust sampling pipeline with the gas detection device 24 at a certain moment. The air inlet end of the head end postprocessor and the air outlet end of the tail end postprocessor are connected to corresponding exhaust pipelines through connecting pipes, adjacent postprocessors are also connected with each other through corresponding connecting pipes, and exhaust sampling holes are respectively formed in the corresponding connecting pipes.
In this embodiment, 2 exhaust pipes are provided, and two exhaust pipes 171 and 172 are connected to the exhaust pipe of the diesel engine through a three-way pipe 12, and high temperature resistant manual butterfly valves 111 and 112 are respectively installed on the two exhaust pipes for selecting the exhaust gas flowing pipe. The first exhaust pipe is provided with a first oxidation catalytic converter 131, a first catalytic type continuous regeneration particle catcher 136 and a first selective catalytic reduction catalyst 135 respectively, and the second exhaust pipe is provided with a second oxidation catalytic converter 132, a second catalytic type continuous regeneration particle catcher 133 and a second selective catalytic reduction catalyst 134 respectively. The exhaust sampling holes 161, 162, 163, 164, 165, 166, 167, 168 are punched in each of the connection pipes 151, 152, 153, 154, 156, 157, 158.
As shown in fig. 2, the connecting pipe is fixed by the connecting device 14, the connecting device 14 comprises a base 143, a support plate 142 and two clamps, the support plate 142 and the clamps are respectively provided with 2 clamps, the clamps are respectively symmetrically arranged at the left end and the right end of the base 143 through the support plate 142, the connecting pipe is parallel to the base 143, and the two ends of the connecting pipe are respectively fixed by the clamps. The clamp includes hoop 145 and snap ring 141, and hoop 145 is equipped with open-ended annular structure for one end, snap ring 141 set up a plurality of and along hoop 145 inner wall evenly distributed, hoop 145 open end is equipped with two parallel arrangement's butt joint board 144, the symmetry sets up the fixed orifices that are used for the bolt fastening on the butt joint board 144.
As shown in fig. 3, the exhaust sampling control unit includes a plurality of electrically controlled valves and a first controller connected to the electrically controlled valves, respectively. In this embodiment, each of the electric control valves is connected through an exhaust sampling pipe 21, 23, the electric control valves include a first electric control three-way valve 221, a second electric control three-way valve 222, a third electric control three-way valve 223, a first electric control four-way valve 231 and a second electric control four-way valve 232, the exhaust sampling holes 161 and 168 in the first exhaust pipe are respectively connected with 2 channels in the first electric control three-way valve 221, the third channel of the first electric control three-way valve 221, the exhaust sampling holes 166 and 167 are connected with the first electric control four-way valve 231, the exhaust sampling holes in the second exhaust pipe are similarly connected, and finally the first electric control four-way valve 231 and the second electric control four-way valve 232 are connected with the third electric control three-way valve 223, and the third electric control three-way valve 223 is connected with the gas detection device 24.
As shown in fig. 4 and 5, the system further comprises a rapid cooling device, wherein the rapid cooling device comprises a liquid nitrogen injector, and each post-processor in each exhaust pipeline is provided with a liquid nitrogen injector. The rapid cooling device comprises vacuum heat-insulating pipes 34, one vacuum heat-insulating pipe 34 is respectively arranged between two adjacent exhaust pipelines, the vacuum heat-insulating pipes 34 are connected to a liquid nitrogen tank 33 through a main control valve 32, a plurality of injector mounting ports 35 are arranged on the vacuum heat-insulating pipes 34, and during testing, liquid spraying nitrogen injectors are arranged on the injector mounting ports 35 at corresponding positions of the postprocessors. Since there are 2 exhaust lines in this embodiment, one vacuum thermal insulation piping 34 is provided. The number of liquid nitrogen injectors is 6, 311, 312, 313, 314, 315 and 316 in the figure. Each liquid nitrogen injector comprises two injection ports which are distributed in a splayed shape and are arranged towards the post-processor, the injection ports are provided with liquid nitrogen injector automatic control valves 37, and the liquid nitrogen injector automatic control valves 37 are connected to a liquid nitrogen injection automatic control unit. The liquid nitrogen injection automatic control unit comprises an infrared temperature detector 36, a flow sensor 39 and a second controller, wherein the flow sensor 39 is arranged at the output end of the diesel engine exhaust pipe, the infrared temperature detector 36 is arranged near a head end post-processor in each exhaust pipeline, the infrared temperature detector 36 and the flow sensor 39 are both connected to the second controller, and the second controller is connected with the liquid nitrogen injector automatic control valve 37. In this embodiment, the first controller and the second controller are one controller, namely, the ECU25 in the drawing.
Fig. 6 is a flowchart of the rapid cooling device according to the present embodiment, firstly, the flow of the flow sensor 39 is obtained, and whether the flow is less than or equal to 0 is determined, if yes, the temperature of the temperature sensor is obtained, otherwise, the flow of the flow sensor 39 is monitored all the time. Judging whether the temperature of the temperature sensor is less than 60 ℃, if so, closing the total control valve 32, and simultaneously closing the automatic control valve 37 of the liquid nitrogen injector, otherwise, opening the total control valve 32, and simultaneously opening the automatic control valve 37 of the liquid nitrogen injector, and the liquid nitrogen injector sprays liquid nitrogen to the post processor for rapid cooling.
In this embodiment, when two sets of exhaust gas detection schemes are simultaneously performed, the high temperature resistant manual butterfly valves 111 and 112 are opened first, the diesel engine is started, the engine is warmed up, and sampling is performed after the diesel engine is normally operated.
The ECU25 outputs a control signal to turn the first electronically controlled four-way valve 231 to a position communicating with the first electronically controlled three-way valve 221, the third electronically controlled three-way valve 223 and the gas detection device 24, turns the first electronically controlled three-way valve 221 to an angle at which the gas detection device 24 communicates with the front exhaust sampling hole 161 of the first oxidation catalyst converter 131, samples after stabilization, the ECU25 outputs a control signal to turn the rotation shaft of the first electronically controlled three-way valve 221 by 90 ° after sampling is completed, communicates the gas detection device 24 with the rear exhaust sampling hole 168 of the first oxidation catalyst converter 131, samples after stabilization, the ECU25 outputs a control signal to turn the first electronically controlled four-way valve 231 to a position at which the rear exhaust sampling hole 167 of the first catalytic continuous regeneration particle catcher 136 communicates with the gas detection device 24 after sampling is completed, after the sampling is completed, the ECU25 outputs a control signal to rotate the first electrically controlled four-way valve 231 to a position where the exhaust sampling hole 166 of the first selective catalytic reduction catalyst 135 communicates with the gas detection device 24, after the sampling is completed, the ECU25 outputs a control signal to rotate the second electrically controlled four-way valve 232 to a position where the second electrically controlled three-way valve 222, the third electrically controlled three-way valve 223 communicate with the gas detection device 24, the second electrically controlled three-way valve 222 to an angle where the gas detection device 24 communicates with the exhaust sampling hole 162 of the second oxidation catalyst 132, after the sampling is completed, the ECU25 outputs a control signal to rotate the second electrically controlled three-way valve 222 by 90 ° to communicate the gas detection device 24 with the exhaust sampling hole 163 of the second oxidation catalyst 132, after the sampling is completed, the ECU25 outputs a control signal to enable the second electrically controlled four-way valve 232 to rotate to a position where the exhaust sampling hole 164 of the second catalytic continuous regeneration particle catcher 133 is communicated with the gas detection device 24, sampling is performed after the sampling is stabilized, and after the sampling is completed, the ECU25 outputs a control signal to enable the second electrically controlled four-way valve 232 to rotate to a position where the exhaust sampling hole 165 of the second selective catalytic reduction catalyst 134 is communicated with the gas detection device 24, and sampling is performed after the sampling is stabilized. After the sampling is completed, that is, the first oxidation catalyst 131 and the second oxidation catalyst 132 in the two schemes are completed, the first catalytic type continuous regeneration particle trap 136 and the second catalytic type continuous regeneration particle trap 133 are completed, and the exhaust gas after the first selective catalytic reduction catalyst 135 and the second selective catalytic reduction catalyst 134 is collected and analyzed.
When the test is still running, the flow sensor 39 transmits a signal to the control center 38, and at this time, the flow is not zero, and the valve is not opened for cooling; after the test is finished, the flow sensor 39 transmits a signal to the control center 38, the flow is zero, and when the surface temperature of the first oxidation catalytic converter 131 monitored by the infrared temperature detector 36 is greater than the temperature threshold value of 60 ℃, the control center 38 controls the liquid nitrogen total control valve 32 to open, and the liquid nitrogen starts to be transmitted. The control center 38 outputs a control signal to open the liquid nitrogen injector automatic control valve 37 near each post-processor, the liquid nitrogen injectors 311, 312, 313, 314, 315, 316 inject liquid nitrogen toward the post-processor, the temperature drops, the infrared temperature detector 36 monitors the surface temperature of the first oxidation catalyst 131, and when the temperature is less than or equal to the temperature threshold 60 ℃, the control center 38 closes the total control valve 32 and all the liquid nitrogen injector automatic control valves 37, that is, the cooling is finished, and the disassembly can be performed.
Example 2
The emission reduction performance test system of the combined type post-processor of the diesel engine in the embodiment is the same as the embodiment, and is different in that only one set of scheme of exhaust detection is independently performed.
As shown in fig. 7 and 8, the operation of opening only the manual butterfly valve 111 is taken as an example to explain that the high temperature resistant manual butterfly valve 111 is opened first, the diesel engine is started, the engine is warmed up, and sampling is performed after the diesel engine is normally operated.
The ECU25 outputs a control signal to turn the first electronically controlled four-way valve 231 to a position communicating with the first electronically controlled three-way valve 221, the third electronically controlled three-way valve 223 and the gas detection device 24, turn the first electronically controlled three-way valve 221 to an angle to communicate the gas detection device 24 with the front exhaust sampling hole 161 of the first oxidation catalyst 131, sample after stabilization, and the ECU25 outputs a control signal to rotate the rotation shaft of the first electronically controlled three-way valve 221 by 90 ° after completion of sampling to communicate the gas detection device 24 with the rear exhaust sampling hole 168 of the first oxidation catalyst 131, sample after stabilization, after the sampling is completed, the ECU25 outputs a control signal to enable the first electric control four-way valve 231 to rotate to a position where the exhaust sampling hole 167 is communicated with the gas detection device 24 after the first catalytic type continuous regeneration particle catcher 136, sampling is performed after the sampling is completed, the ECU25 outputs a control signal to enable the first electric control four-way valve 231 to rotate to a position where the exhaust sampling hole 166 is communicated with the gas detection device 24 after the first selective catalytic reduction catalyst 135 is completed, sampling is performed after the sampling is completed, namely, the first oxidation catalyst 131 of a set of schemes is completed, and tail gas collection and analysis are performed after the first catalytic type continuous regeneration particle catcher 136 and after the first selective catalytic reduction catalyst 135.
When the test is still running, the flow sensor 39 transmits a signal to the control center 38, and at this time, the flow is not zero, and the valve is not opened for cooling; after the test is finished, the flow sensor 39 transmits a signal to the control center 38, the flow is zero, when the DOC surface temperature monitored by the infrared temperature detector 36 is greater than the temperature threshold value of 60 ℃, the control center 38 outputs a control signal, the automatic liquid nitrogen injector control valve 37 near the post-processor on one side of the exhaust pipe 171 is started, the liquid nitrogen injectors 311, 315 and 316 inject liquid nitrogen towards the post-processor, the temperature is reduced, the infrared temperature detector 36 monitors the DOC surface temperature, and when the temperature is less than or equal to the temperature threshold value of 60 ℃, the control center 38 closes the total control valve 32 and all the automatic liquid nitrogen injector control valves 37, namely, the cooling is finished, and the disassembly can be carried out.
Example 3
The emission reduction performance test system of the combined post-processor of the diesel engine of this embodiment includes 3 exhaust pipelines which are connected in parallel and shunted, so that detection of emission performance of 3 sets of combined post-processing can be realized, the system structure is similar to that of embodiment 1, the difference is that in the embodiment, the three-way pipe 12 is replaced by a four-way pipe, the 4-way pipe is respectively connected with the exhaust pipe of the diesel engine and 3 exhaust pipelines, the exhaust sampling control unit in each exhaust pipeline is similarly arranged as in embodiment 1, each exhaust pipeline includes an electric control three-way valve and an electric control four-way valve, and meanwhile, the third electric control three-way valve 223 in real-time example 1 is replaced by an electric control four-way valve as a total electric control four-way valve, and the total electric control four-way valve is respectively connected with the electric control four-way valve in the 3 exhaust pipelines and the gas detection device 24. Also different from example 1 is that: a vacuum heat-preserving and insulating pipe 34 is respectively arranged between two adjacent exhaust pipelines, so that 2 vacuum heat-preserving and insulating pipes 34 are arranged in the embodiment, and each exhaust pipeline is provided with a liquid nitrogen injector.
In the embodiment, the emission reduction performance test system of the combined type postprocessor of the diesel engine can select a set of emission reduction performance test of the combined type postprocessor, and the working principle is consistent with that of the embodiment 2; the system can also select the simultaneous test of emission reduction performance of 2 sets of combined post-processors, and the working principle is consistent with that of the embodiment 1; in addition, the system can also select the simultaneous test of the emission reduction performance of 3 sets of combined post-processors, and the working principle is similar to that of the embodiment 1, except that the gas collection and detection in 4 exhaust sampling holes in the 3 rd exhaust pipeline are added.
Claims (6)
1. The emission reduction performance test system for the combined type postprocessors of the diesel engine is characterized by comprising at least two paths of exhaust pipelines which are connected in parallel and are arranged in a shunting mode, wherein the head end of each path of exhaust pipeline is connected with an exhaust pipe of the diesel engine through a manual butterfly valve respectively, the rear end of the manual butterfly valve in each path of exhaust pipeline comprises a plurality of postprocessors which are sequentially connected in series, an air inlet end of each head end postprocessor, an air outlet end of each tail end postprocessor and two adjacent postprocessors are respectively provided with an exhaust sampling hole, the exhaust sampling holes are respectively connected to a gas detection device (24) through one path of independent exhaust sampling pipelines, and the exhaust sampling pipelines are connected with an exhaust sampling control unit which is used for communicating the only one path of exhaust sampling pipeline with the gas detection device (24) at a certain moment;
the system also comprises a rapid cooling device, wherein the rapid cooling device comprises a liquid nitrogen injector, and each post processor in each exhaust pipeline is provided with a liquid nitrogen injector;
the rapid cooling device comprises vacuum heat-insulating pipes (34), one vacuum heat-insulating pipe (34) is respectively arranged between two adjacent exhaust pipelines, the vacuum heat-insulating pipes (34) are connected to a liquid nitrogen tank (33) through a total control valve (32), a plurality of injector mounting ports (35) are arranged on the vacuum heat-insulating pipes (34), and liquid nitrogen injectors are arranged on the injector mounting ports (35) at corresponding positions of the post processor during testing;
the liquid nitrogen injector comprises two injection ports, the injection ports are distributed in a splayed shape and are arranged towards the post-processor, the injection ports are provided with liquid nitrogen injector automatic control valves (37), and the liquid nitrogen injector automatic control valves (37) are connected to a liquid nitrogen injection automatic control unit;
the automatic control unit for liquid nitrogen injection comprises an infrared temperature detector (36), a flow sensor (39) and a second controller, wherein the flow sensor (39) is arranged at the output end of a diesel engine exhaust pipe, the infrared temperature detector (36) is arranged near a front end post-processor in each exhaust pipeline, the infrared temperature detector (36) and the flow sensor (39) are both connected to the second controller, and the second controller is connected with the automatic control valve (37) of the liquid nitrogen injector.
2. The emission reduction performance test system of a combined post-processor of a diesel engine according to claim 1, wherein the inlet end of the head post-processor and the outlet end of the tail post-processor are connected to the corresponding exhaust pipelines through connecting pipes, adjacent post-processors are also connected to each other through corresponding connecting pipes, and the exhaust sampling holes are respectively arranged on the corresponding connecting pipes.
3. The emission reduction performance test system of the combined type post-processor of the diesel engine according to claim 2, wherein the connecting pipe is fixed through the connecting device (14), the connecting device (14) comprises a base (143), a supporting plate (142) and hoops, the supporting plate (142) and the hoops are respectively provided with 2 hoops, the hoops are symmetrically arranged at the left end and the right end of the base (143) through the supporting plate (142), and the connecting pipe is parallel to the base (143) and the two ends of the connecting pipe are respectively fixed through the hoops.
4. The diesel engine combined type post-processor emission reduction performance test system according to claim 3, wherein the clamp comprises a hoop (145) and a clamp ring (141), the hoop (145) is of an annular structure with an opening at one end, the clamp ring (141) is provided with a plurality of clamp rings and evenly distributed along the inner wall of the hoop (145), two butt joint plates (144) which are arranged in parallel are arranged at the opening end of the hoop (145), and fixing holes for fixing bolts are symmetrically formed in the butt joint plates (144).
5. The diesel engine combined type post-processor emission reduction performance test system according to claim 1, wherein the post-processor comprises an oxidation catalytic converter, a catalytic continuous regeneration particle catcher and a selective catalytic reduction catalyst which are sequentially connected.
6. The exhaust emission reduction performance test system of a combined post-processor of a diesel engine according to claim 1, wherein the exhaust sampling control unit comprises a plurality of electric control valves and a first controller respectively connected with the electric control valves.
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| CN112228195A (en) * | 2020-09-21 | 2021-01-15 | 江苏大学 | Variable combination control system of engine exhaust aftertreatment and tail gas collection device |
| CN112781882B (en) * | 2020-12-21 | 2022-12-13 | 中国船舶集团有限公司第七一一研究所 | Single-cylinder diesel engine test platform |
| CN113566871A (en) * | 2021-07-21 | 2021-10-29 | 无锡威孚力达催化净化器有限责任公司 | Diesel vehicle aftertreatment sensor detection system |
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| US9151202B2 (en) * | 2010-10-13 | 2015-10-06 | Cummins Intellectual Property, Inc. | Multi-leg exhaust aftertreatment system and method |
| CN102095587B (en) * | 2010-12-17 | 2012-09-19 | 杭州银轮科技有限公司 | Simulation test bed used for engine exhaust aftertreatment device |
| JP2012137374A (en) * | 2010-12-27 | 2012-07-19 | Horiba Ltd | Exhaust gas analysis system and exhaust gas analysis method |
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| CN204961040U (en) * | 2015-09-18 | 2016-01-13 | 天津大学 | Variable combinatorial sum multichannel sampling device of engine post processor |
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| CN206917714U (en) * | 2017-04-20 | 2018-01-23 | 同济大学 | A kind of box-like preprocessor reduction performance test system of diesel engine unit |
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