CN111878196B - Exhaust system of diesel locomotive - Google Patents
Exhaust system of diesel locomotive Download PDFInfo
- Publication number
- CN111878196B CN111878196B CN202010954364.9A CN202010954364A CN111878196B CN 111878196 B CN111878196 B CN 111878196B CN 202010954364 A CN202010954364 A CN 202010954364A CN 111878196 B CN111878196 B CN 111878196B
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- China
- Prior art keywords
- internal combustion
- exhaust
- mixer
- filter
- urea solution
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Links
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 41
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000004202 carbamide Substances 0.000 claims abstract description 61
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 claims abstract description 44
- 239000000243 solution Substances 0.000 claims abstract description 41
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 230000003584 silencer Effects 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000013618 particulate matter Substances 0.000 claims abstract description 4
- 239000000498 cooling water Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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]
-
- 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
- F01N13/009—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 having two or more separate purifying devices arranged in series
-
- 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
-
- 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
-
- 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
- F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/027—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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
-
- 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
-
- 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
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an exhaust system of an internal combustion locomotive, which comprises: the mixer is used for mixing the urea solution and the tail gas, is connected with a urea injection device, and is controlled by the controller and driven by a locomotive air source; a muffler for reducing engine exhaust noise and allowing the urea solution to react with nitrogen oxides in the exhaust gas; a filter for treating particulate matter in the exhaust gas; the mixer, the silencer and the filter are sequentially connected with the exhaust pipeline, the urea injection device injects urea solution into the mixer, and tail gas exhausted by the internal combustion engine is mixed and reacted with the urea solution in the mixer and sequentially passes through the silencer and the filter. According to the diesel locomotive exhaust system disclosed by the invention, urea solution is mixed with tail gas, so that urea reacts with nitrogen oxides in the tail gas, the pollution of the nitrogen oxides to the atmosphere is reduced, and meanwhile, particle pollutants in the tail gas are filtered, so that the discharged tail gas reaches higher environmental protection requirements.
Description
Technical Field
The invention relates to the field of tail gas treatment of diesel locomotives, in particular to an exhaust system of a diesel locomotive.
Background
With the gradual increase of people's awareness of environmental protection, the emission standard of internal combustion engines is also increased. It is generally considered by domestic and foreign specialists that it is difficult to meet the requirements of emission standards of Europe IIIB and Europe V only by optimizing the in-machine control measures such as combustion, and how to reduce nitrogen oxides in exhaust emission and solid particles becomes a problem which needs to be faced in the industry.
Disclosure of Invention
The present invention provides an exhaust system for an internal combustion locomotive to overcome the above-mentioned problems.
An exhaust system for an internal combustion locomotive, comprising:
the mixer is used for mixing the urea solution and the tail gas, and is connected with a urea injection device which is controlled by a controller and driven by a locomotive air source;
A muffler for reducing engine exhaust noise and reacting urea solution with nitrogen oxides in exhaust gas;
A filter for filtering particulate matter in the exhaust gas;
A mounting bracket for securing the mixer and muffler;
The side of the internal combustion engine is provided with an exhaust port, the mixer is connected with the exhaust port, the mounting bracket comprises upright posts arranged on two sides of the internal combustion engine and a cross beam arranged on the top of the upright posts, the cross beam is used for fixing the silencer above the internal combustion engine, the upright posts are provided with supporting plates, the supporting plates are used for fixing the mixer on the side of the internal combustion engine, the mixer is connected with the silencer through connecting pipes, and the exhaust direction of tail gas is changed through the connecting pipes;
The urea injection device injects urea solution into the mixer, and tail gas is discharged from the internal combustion engine, enters the mixer to be mixed with the urea solution, and sequentially passes through the silencer and the filter.
Further, the stand includes two first stands and two second stands, two distance between the first stand is greater than two distance between the second stand, the layer board includes first layer board and second layer board, first stand includes two first support piece, be equipped with between the first support piece first layer board, the second stand includes a second support piece, the second support piece outside is equipped with the second layer board, first layer board is close to the gas vent of internal-combustion engine.
Further, the connection pipe includes two curved portions, each of which changes the exhaust direction of the exhaust gas by 90 °.
Further, the filter comprises an active regeneration system, the active regeneration system comprises a differential pressure sensor, a first temperature sensor and an electric heater, the differential pressure sensor is used for detecting the pressure difference between the front and the rear of the filter, the electric heater is used for forming high temperature in the filter, the first temperature sensor is used for detecting the temperature in the filter, and the differential pressure sensor, the first temperature sensor and the electric heater are all connected with a locomotive control module;
Further, the urea injection device comprises a metering unit, and the metering unit controls the injection quantity of the urea injection device.
Further, the urea injection device is connected with the urea solution tank through a urea solution pipeline, a cooling water pipe is arranged outside the urea solution pipeline, a water heating electromagnetic valve is arranged on the cooling water pipe, and the water heating electromagnetic valve is connected with a locomotive control module.
Further, the steel wire shock absorber is arranged between the cross beam and the upright post.
Further, a second temperature sensor is arranged in the mixer.
Further, an air box, a chimney and a rain hat are sequentially arranged behind the filter.
According to the diesel locomotive exhaust system disclosed by the invention, urea solution is mixed with tail gas, so that urea reacts with nitrogen oxides in the tail gas, the pollution of the nitrogen oxides to the atmosphere is reduced, and meanwhile, the particulate pollutants in the tail gas are treated, so that the discharged tail gas reaches higher environmental protection requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an exhaust system of an internal combustion locomotive according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exhaust system of an internal combustion locomotive in front view according to an embodiment of the present invention;
FIG. 3 is a schematic view of a muffler and mixer configuration in an exhaust system of an internal combustion locomotive according to an embodiment of the present invention;
Fig. 4 is a schematic side view of an exhaust system of an internal combustion locomotive according to an embodiment of the present invention.
In the figure: 1. a controller bracket; 2. a controller; 3. a water heating electromagnetic valve; 4. a transition body; 5. a bellows; 6. a mounting bracket; 611. a first upright; 612. a second upright; 62. a cross beam; 631. a first pallet; 632. a second pallet; 7. a mixer; 8.a metering unit; 9. a connecting pipe; 91. a bending portion; 10. a wire damper; 11. a muffler; 12. a filter; 13. an exhaust pipe; 14. a wind box; 15. a chimney; 16. a rain cap; 17. an exhaust system mounting bracket; 18. an internal combustion engine.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, an exhaust system for an internal combustion locomotive, comprising:
A mixer 7 for mixing urea solution with exhaust gas, the mixer 7 being connected to a urea injection device, the urea injection device being controlled by the controller 2 and driven by a locomotive air source;
A muffler 11 for reducing exhaust noise of the internal combustion engine 18 and mixing urea solution with nitrogen oxides in the exhaust gas;
a filter 12 for filtering particulate matter in the exhaust gas;
a mounting bracket 6 for fixing the mixer 7 and the muffler 11;
The two sides of the internal combustion engine 18 are provided with exhaust ports, the two mixers 7 are respectively connected with the two exhaust ports, the mounting bracket 6 comprises upright posts arranged on the two sides of the internal combustion engine and a cross beam 62 arranged on the top of the upright posts, the cross beam 62 fixes the silencer 11 above the internal combustion engine 18, the upright posts are provided with supporting plates, the supporting plates fix the mixers 7 on the side surfaces of the internal combustion engine 18, the mixers 7 and the silencer 11 are connected through connecting pipes 9, and the connecting pipes 9 change the exhaust direction of tail gas;
The urea injection device injects urea solution into the mixer, and tail gas is discharged from the internal combustion engine, enters the mixer to be mixed with the urea solution, and sequentially passes through the silencer and the filter.
The urea solution is stored in a urea tank and is sprayed into the mixer 7 through a urea pipeline and a urea spraying device, and the locomotive is provided with pressure air as a locomotive air source to drive the urea spraying device to spray the urea solution; the tail gas passes through the transition body 4 and the corrugated pipe 5 from the internal combustion engine, enters the mixer 7, is fully mixed with urea solution spray in the mixer 7, and the mixed gas enters the silencer 11 through the connecting pipe 9, and undergoes catalytic reduction reaction in the silencer 11 to reduce nitrogen oxides in the tail gas. By adopting the corrugated pipe connection, the installation error can be made up, and the vibration and impact generated by each part in the working process can be reduced.
The mixed gas after catalytic reduction reaction enters a filter 12, the filter 12 filters out particles in the mixed gas, the filtered mixed gas passes through an exhaust pipe 13 and enters a bellows 14, the bellows 14 is used for collecting two sets of exhaust system tail gases of the high-power internal combustion engine, and finally the tail gases are discharged into the atmosphere through a chimney 15. The outlet of the chimney 15 is provided with a rain cap 16 for preventing rain, snow, sundries and the like in the external environment from entering.
The stand includes first stand 611 and second stand 612, and distance between two first stands is greater than the distance between two second stands, and first stand 611 is in the middle part of internal-combustion engine 18, and distance between two first stands 611 is great, makes things convenient for the layout of internal-combustion engine, and the layer board includes first layer board 631 and second layer board 632, and first stand 611 includes two first support pieces, is equipped with first layer board between the first support piece, and the second stand includes a second support piece, and the second support piece outside is equipped with the second layer board, and first layer board is close to the gas vent of internal-combustion engine. The first layer board is fixed to two first support pieces, and the structure is firm, and intensity is high, and other pipeline can be laid in the space between two first support pieces moreover, and the second stand adopts a second support piece, on the one hand because the gravity that the second layer board bore is less than first layer board slightly, on the other hand reduces the support piece in the outside, can leave more maintenance spaces, convenient maintenance operation. The connection pipe includes two curved portions, each of which changes the exhaust direction of the exhaust gas by 90 °. The bending of the whole connecting pipe reaches 180 degrees through the two 90-degree bending parts, even if the exhaust directions of tail gases are opposite, a retraced path is formed, the space occupied by the two 90-degree bending parts is smaller than the space occupied by the two 180-degree bending parts, and the arrangement of the exhaust path can complete the arrangement of all parts in a limited space, so that the exhaust emission requirement is met.
The connecting pipe 9 adopts a hose, so that the exhaust emission direction is changed, as can be seen from fig. 1, the exhaust emission direction before the mixer is from left to right, and the mixed gas of the exhaust and the urea solution passes through the hose, upwards enters the silencer, and then flows from right to left. The layout mode is that the mixer is arranged below the silencer, the hose is changed in direction only twice, the back pressure requirement of an exhaust system is met, the normal operation of the internal combustion engine is not influenced, the minimum space is occupied, and finally, the layout of all parts is completed in a limited space. The hose connection is adopted, so that installation errors can be made up, and vibration and impact generated by each part in the working process can be reduced.
The urea injection device comprises a metering unit 8, and the metering unit 8 controls the injection quantity of the urea injection device. The metering unit 8 is connected with a locomotive control module, the locomotive control module requires the injection quantity of the urea solution according to the rotating speed and the output power of the diesel engine, the exhaust gas quantity is changed under different working conditions, and different urea solution injection quantities correspond to different exhaust gas quantities, so that the urea solution and the tail gas always reach the optimal mixing ratio.
The filter 12 includes an active regeneration system for removing soot particulate from the filter 12. The active regeneration system comprises a differential pressure sensor, a first temperature sensor and an electric heater, wherein the differential pressure sensor is used for detecting the front-rear pressure difference of the filter 12, the electric heater is used for forming high temperature in the filter 12, the first temperature sensor is used for detecting the temperature in the filter 12, and the differential pressure sensor, the first temperature sensor and the electric heater are all connected with a locomotive control module. With the filter 12 working, more and more soot particles are contained, so that the filter 12 is blocked, the pressure difference between the front and rear of the filter 12 is larger, the pressure difference sensor detects that the pressure difference between the front and rear of the filter 12 is larger, the locomotive control module judges that an electric heater needs to be started according to the detection result of the pressure difference sensor, the filter 12 is heated to a high temperature, the particles filtered in the filter 12 are burnt, the filter back pressure is reduced, the temperature in the filter 12 is detected by a first temperature sensor, and when the temperature in the filter 12 is higher than 400 ℃, the locomotive control module turns off the electric heater.
The urea injection device is connected with the urea solution tank through a urea solution pipeline, a cooling water pipe is arranged outside the urea solution pipeline and used for cooling an internal combustion engine of the locomotive, the temperature of cooling water rises along with the running of the locomotive, a water heating electromagnetic valve 3 is arranged on the cooling water pipe, and the water heating electromagnetic valve 3 is connected with a locomotive control module. In order to prevent the urea solution from crystallizing at a lower temperature, when the ambient temperature is lower than 7 ℃, the locomotive control module opens the water heating electromagnetic valve 3 to enable cooling water of the internal combustion engine to circulate into a cooling water pipe outside a urea solution pipeline to heat the urea solution.
Further, a wire damper 10 is also included, and the wire damper 10 is provided between the muffler 11 and the muffler bracket 6. The locomotive operation working condition has larger vibration, and the steel wire shock absorber 10 can absorb the high-frequency vibration generated by the muffler 11 during operation, so that noise is reduced.
The mixer is provided with a second temperature sensor for detecting the exhaust emission temperature, and the second temperature sensor is connected with the locomotive control module.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. An exhaust system for an internal combustion locomotive, characterized by: comprising the following steps:
the mixer is used for mixing the urea solution and the tail gas, and is connected with a urea injection device which is controlled by a controller and driven by a locomotive air source;
A muffler for reducing engine exhaust noise and reacting urea solution with nitrogen oxides in exhaust gas;
A filter for filtering particulate matter in the exhaust gas;
A mounting bracket for securing the mixer and muffler;
The side of the internal combustion engine is provided with an exhaust port, the mixer is connected with the exhaust port, the mounting bracket comprises upright posts arranged on two sides of the internal combustion engine and a cross beam arranged on the top of the upright posts, the cross beam is used for fixing the silencer above the internal combustion engine, the upright posts are provided with supporting plates, the supporting plates are used for fixing the mixer on the side of the internal combustion engine, the mixer is connected with the silencer through connecting pipes, and the exhaust direction of tail gas is changed through the connecting pipes;
The urea injection device injects urea solution into the mixer, and tail gas is discharged from the internal combustion engine, enters the mixer to be mixed with the urea solution and sequentially passes through the silencer and the filter;
The stand columns comprise two first stand columns and two second stand columns, the distance between the two first stand columns is larger than the distance between the two second stand columns, the support plates comprise a first support plate and a second support plate, the first stand columns comprise two first support pieces, the first support plates are arranged between the first support pieces, the second stand columns comprise a second support piece, the second support plates are arranged on the outer sides of the second support pieces, and the first support plates are close to an exhaust port of the internal combustion engine;
The connecting pipe comprises two bending parts, and each bending part changes the exhaust direction of the tail gas by 90 degrees;
The filter comprises an active regeneration system, the active regeneration system comprises a differential pressure sensor, a first temperature sensor and an electric heater, the differential pressure sensor is used for detecting the front-rear pressure difference of the filter, the electric heater enables the filter to be at a high temperature, the first temperature sensor is used for detecting the temperature in the filter, and the differential pressure sensor, the first temperature sensor and the electric heater are all connected with a locomotive control module.
2. An exhaust system of an internal combustion locomotive as claimed in claim 1, wherein: the urea injection device comprises a metering unit, and the metering unit controls the injection quantity of the urea injection device.
3. An exhaust system of an internal combustion locomotive as claimed in claim 1, wherein: the urea injection device is connected with the urea solution tank through a urea solution pipeline, a cooling water pipe is arranged outside the urea solution pipeline, a water heating electromagnetic valve is arranged on the cooling water pipe, and the water heating electromagnetic valve is connected with a locomotive control module.
4. An exhaust system of an internal combustion locomotive as claimed in claim 1, wherein: the steel wire shock absorber is arranged between the cross beam and the upright post.
5. An exhaust system of an internal combustion locomotive as claimed in claim 1, wherein: the mixer is provided with a second temperature sensor.
6. An exhaust system of an internal combustion locomotive as claimed in claim 1, wherein: the filter is sequentially provided with an air box, a chimney and a rain hat.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010954364.9A CN111878196B (en) | 2020-09-11 | 2020-09-11 | Exhaust system of diesel locomotive |
| PCT/CN2021/099359 WO2022052536A1 (en) | 2020-09-11 | 2021-06-10 | Exhaust system for diesel locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010954364.9A CN111878196B (en) | 2020-09-11 | 2020-09-11 | Exhaust system of diesel locomotive |
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| CN111878196A CN111878196A (en) | 2020-11-03 |
| CN111878196B true CN111878196B (en) | 2024-05-14 |
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| CN202010954364.9A Active CN111878196B (en) | 2020-09-11 | 2020-09-11 | Exhaust system of diesel locomotive |
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| CN (1) | CN111878196B (en) |
| WO (1) | WO2022052536A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111878196B (en) * | 2020-09-11 | 2024-05-14 | 中车大连机车研究所有限公司 | Exhaust system of diesel locomotive |
| CN112576390B (en) * | 2020-11-18 | 2022-08-05 | 潍柴动力股份有限公司 | Engine exhaust control method and device, storage medium and electronic equipment |
| CN113898451A (en) * | 2021-09-26 | 2022-01-07 | 安徽长三角环保科技有限公司 | Diesel engine tail gas purifying equipment and purifying process thereof |
| CN115680839B (en) * | 2022-11-14 | 2024-05-10 | 一汽解放汽车有限公司 | Post-treatment mixer and post-treatment method for reducing urea crystallization |
| CN117189320B (en) * | 2023-10-31 | 2024-03-19 | 潍柴动力股份有限公司 | Urea injection control method, device, equipment and storage medium |
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| WO2022052536A1 (en) | 2022-03-17 |
| CN111878196A (en) | 2020-11-03 |
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