CN113864030B - Diesel engine airborne urea injection system - Google Patents
Diesel engine airborne urea injection system Download PDFInfo
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- CN113864030B CN113864030B CN202110934487.0A CN202110934487A CN113864030B CN 113864030 B CN113864030 B CN 113864030B CN 202110934487 A CN202110934487 A CN 202110934487A CN 113864030 B CN113864030 B CN 113864030B
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- filter screen
- urea
- channel
- injection system
- diesel engine
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1426—Filtration 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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/148—Arrangement of sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an onboard urea injection system of a diesel engine, which comprises a nozzle, wherein the nozzle is connected with a urea supply pipeline and a compressed gas supply pipeline, a filter device is arranged on the urea supply pipeline, the filter device comprises a front channel, a filter screen is arranged on the front channel, a notch is formed in the filter screen, fan blades are embedded in the notch, part of the screen surface of the filter screen extends into the front channel and is intercepted, the front channel is divided into a main channel and an auxiliary channel at the rear end of the filter screen, the main channel is directly led out, the auxiliary channel firstly passes through the notch, then reversely passes through the rest screen surface of the filter screen, and finally is led out. The filtering device is arranged on the urea supply pipeline of the injection system, so that undissolved or insoluble impurity particles in urea can be effectively prevented from blocking the nozzle, and the running stability of the system is improved; the filtering device does not need a driving piece, can drive the filter screen to rotate and automatically back flush and clean the filter screen, saves the process of manual disassembly and cleaning, does not need to be stopped for cleaning, is very convenient, and saves electric energy at the same time.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to an onboard urea injection system of a diesel engine.
Background
Marine diesel engines are the primary power source for ships, which emit large amounts of exhaust gas during operation, including various harmful pollutants, such as NOx. For NOxInternational prevention of pollution by ships with respect to NO in the conventionxThe emissions have a well-defined standard, Tier 3. To meet the emissions standard of Tier3, an SCR system is added to a marine diesel engine to reduce NOxThe amount of discharge of (c). At present, the SCR system mainly decomposes ammonia gas through injected urea at high temperature and high pressure, and the ammonia gas and NOx react under the action of a catalystTo reduce NOxAnd urea injection is therefore an important link in SCR systems.
However, urea generally contains a small amount of undissolved or insoluble impurity particles, and when the spray system sprays, the spray nozzles are easily clogged, and the paper making spray is interrupted.
Disclosure of Invention
The invention aims to provide an onboard urea injection system of a diesel engine, which solves the problem that a nozzle of the existing urea injection system of the diesel engine is easily blocked by urea impurities.
The invention realizes the purpose through the following technical scheme:
the utility model provides a diesel engine machine carries urea injection system, includes the nozzle, the nozzle is connected with urea supply line and compressed gas supply line, urea supply line is connected with the urea case, is equipped with the urea pump on the urea supply line, be equipped with filter equipment on the urea supply line, filter equipment includes leading passageway, the rotatable filter screen that installs in the lateral wall position of leading passageway, the central point of filter screen puts and sets up jaggedly, the breach is embedded to be equipped with the flabellum, and partial wire side of filter screen stretches into leading passageway and forms the interception for impurity particle filters in the urea that forwardly passes the filter screen, leading passageway divide into main entrance and accessory channel at the rear end of filter screen, the main entrance directly draws forth, the accessory channel connects earlier to pass the breach for drive flabellum and filter screen rotate when urea passes the breach, and then the other part of the net surface which reversely passes through the filter screen is connected for cleaning impurity particles on the net surface when the urea passes through the net surface, and finally the impurity particles are led out.
The further improvement lies in that a pressure sensor, a flow meter and an electromagnetic stop valve are further arranged on the urea supply pipeline, and the urea pump, the pressure sensor, the flow meter and the electromagnetic stop valve are all located at the downstream position of the filtering device.
The further improvement is that the compressed gas supply pipeline is provided with a pressure sensor.
In a further development, the secondary channel connection passes straight through the gap.
The further improvement is that the flow cross-sectional area of the primary channel is greater than the flow cross-sectional area of the secondary channel.
The filter screen is circular, the part of the screen surface of the filter screen, which is penetrated by the front channel, is semi-annular, the notch of the filter screen, which is penetrated by the secondary channel, is circular, and the rest of the screen surface of the filter screen, which is penetrated by the secondary channel, is semi-annular.
The further improvement is that the side wall of the filter screen is provided with a plurality of sealing rings for sealing the contact position of the side wall of each channel.
The improved structure is characterized in that a buffer cavity is formed in the position, passing through the rest screen surface of the filter screen, of the auxiliary channel, the flow cross-sectional area of the buffer cavity is larger than that of the other positions of the auxiliary channel, and the buffer cavity is used for collecting the cleaned impurity particles.
The further improvement is that the top end of the buffer cavity is provided with an opening and closing cover, and the rear end of the buffer cavity is provided with an interception net.
The further improvement lies in that the filter screen is vertically installed, all meshes on the screen surface of the filter screen are obliquely arranged in the direction from the front end to the center of the filter screen, and each mesh is arranged into a structure with large apertures at two ends and small aperture in the middle.
The invention has the beneficial effects that: the spraying system is provided with the filtering device on the urea supply pipeline, so that the problem that undissolved or insoluble impurity particles in urea block the nozzle can be effectively avoided, and the running stability of the system is improved. In addition, the filtering device does not need a driving piece, and can drive the filter screen to rotate and automatically back flush the filter screen on the basis of realizing urea conveying and filtering, so that the process of manually disassembling and cleaning is omitted, the shutdown cleaning is not needed, the filtering device is very convenient, and meanwhile, the electric energy is also saved.
Drawings
FIG. 1 is a schematic diagram of an on-board urea injection system for the diesel engine;
FIG. 2 is a schematic view of a filtration apparatus;
FIG. 3 is a schematic diagram showing the position relationship between the filter screen and each channel;
FIG. 4 is a cross-sectional view of a filter screen;
in the figure: 1. a nozzle; 2. a urea supply line; 3. a compressed gas supply conduit; 4. a urea tank; 5. a urea pump; 6. a filtration device; 601. a front channel; 602. a filter screen; 603. a notch; 604. a fan blade; 605. a main channel; 606. a secondary channel; 607. a seal ring; 608. a buffer chamber; 609. opening and closing the cover; 610. an intercepting net; 7. a pressure sensor; 8. a flow meter; 9. an electromagnetic cut-off valve.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Referring to fig. 1 to 4, an onboard urea injection system for a diesel engine includes a nozzle 1, the nozzle 1 is connected with a urea supply pipeline 2 and a compressed gas supply pipeline 3, the urea supply pipeline 2 is connected with a urea tank 4, and the urea supply pipeline 2 is provided with a urea pump 5. The filtering device 6 is arranged on the urea supply pipeline 2, when the system is operated, the urea pump 5 pumps out urea from the urea box 4, the urea enters the nozzle 1 through the urea supply pipeline 2, meanwhile, the compressed gas supply pipeline 3 provides a high-pressure gas source for the nozzle 1, the urea is atomized and sprayed out in the nozzle 1 and is connected with an exhaust pipe of the diesel engine, the waste gas decomposes ammonia gas under the high temperature and high pressure of the urea, and the ammonia gas and NO are utilizedxBy reaction over a catalyst to reduce NOxAnd (4) discharging.
The filter device 6 comprises a front channel 601, a filter screen 602 is rotatably mounted on the outer side wall of the front channel 601, a notch 603 is formed in the center of the filter screen 602, fan blades 604 are embedded in the notch 603, part of the screen surface of the filter screen 602 extends into the front channel 601 to form interception, and is used for filtering impurity particles in urea which passes through the filter screen 602 in the forward direction, the front channel 601 is divided into a main channel 605 and an auxiliary channel 606 at the rear end of the filter screen 602, the main channel 605 is directly led out, the auxiliary channel 606 firstly passes through the notch 603 in a connected mode, is used for driving the fan blades 604 and the filter screen 602 to rotate when urea passes through the notch 603, is then connected with the rest screen surface which passes through the filter screen 602 in the reverse direction, is used for cleaning the impurity particles on the screen surface when urea passes through the screen surface, and is finally led out.
When the filter device 6 works, the urea in the pre-channel 601 firstly passes through the filtering action of part of the screen surface (refer to the position of fig. 2, for convenience of description, the lower screen surface is used for description), the doped impurity particles are filtered by the filter screen 602 and are attached to the screen surface of the filter screen 602, the urea without impurities is conveyed in two paths after being filtered, one of the two paths is led out through the main channel 605, the other path passes through the notch 603 through the sub-channel 606, the fan blade 604 and the filter screen 602 are driven to rotate, and then the other path passes through the remaining screen surface (upper screen surface) of the filter screen 602 in the opposite direction, because the filter screen 602 rotates continuously, the lower screen surface of the filter screen 602 rotates to the upper part, and at the moment, the urea flowing reversely (filtered) washes away impurity particles attached to the upper screen surface, so that the automatic cleaning of the filter screen 602 is realized, and the high efficiency of the filtering is maintained for a long time. The urea in the secondary channel 606 will also be eventually led out into the nozzle 1.
In the invention, the urea supply pipeline 2 is also provided with a pressure sensor 7, a flow meter 8 and an electromagnetic stop valve 9, and the urea pump 5, the pressure sensor 7, the flow meter 8 and the electromagnetic stop valve 9 are all positioned at the downstream position of the filtering device 6. The compressed gas supply line 3 is provided with a pressure sensor 7.
In the present invention, the secondary channel 606 connects the positive through notch 603. It should be noted that, the filter screen 602 is used as a reference for both forward and reverse directions. As can be seen in fig. 2, the connection of the secondary channel 606 to the forward direction through the gap 603 helps to reduce the torturous path of the secondary channel 606, which can immediately turn back through the remaining web surface of the filter screen 602.
In the present invention, the flow cross-sectional area of the main channel 605 is larger than the flow cross-sectional area of the secondary channel 606, and here refers to the flow cross-sectional area immediately after separation, and the design aims to reduce the urea flow rate shared by the secondary channel 606, and subsequently increase the flow area of the secondary channel 606 during back flushing, so as to realize speed reduction buffering, and avoid too fast flow velocity, and to flush up the impurity particles so as not to fall and gather.
In the invention, the filter screen 602 is circular, part of the screen surface of the filter screen 602 penetrated by the front channel 601 is semi-annular, the notch 603 of the filter screen 602 penetrated by the secondary channel 606 is circular, and the rest of the screen surface of the filter screen 602 penetrated by the secondary channel 606 is semi-annular. Thus, the secondary channel 606 passes through the filter screen 602 in sequence, and in combination with the front channel 601, a complete circle is formed exactly at the position of the filter screen 602, no gap exists between the two semi-rings, and the lower screen surface can directly rotate to be the upper screen surface, which is helpful for avoiding the leakage of impurities.
In the invention, the side wall of the filter screen 602 is provided with a plurality of sealing rings 607, and the sealing rings 607 slide tightly against the channel walls when rotating, so as to seal the contact positions of the sealing rings and the channel walls.
In the present invention, in order to further enhance the effect of collecting impurities, the secondary channel 606 is formed with a buffer chamber 608 at a position passing through the remaining screen surface of the filter screen 602, the flow cross-sectional area of the buffer chamber 608 is larger than the flow cross-sectional area of the other positions of the secondary channel 606, and the buffer chamber 608 is used for collecting the cleaned impurity particles. And, the top of buffer chamber 608 is equipped with and opens and shuts the lid 609, can open regularly, the clearance impurity granule of collecting, and the rear end position of buffer chamber 608 is equipped with interception net 610, has further avoided the impurity granule to be carried again.
In order to improve the effect of the filter screen 602 adhering to the foreign particles, the filter screen 602 is further vertically installed, all the meshes on the screen surface of the filter screen 602 are obliquely arranged with the front ends facing the center of the filter screen 602, and each mesh is arranged in a structure with large apertures at two ends and small aperture in the middle. During filtering, impurity particles can be clamped in meshes of the lower net surface, and the meshes of the lower net surface are all inclined with high front and low back, so that the impurity particles basically cannot fall off on the basis of forward impact of urea and rotate along with the net surface; on the upper net surface, the inclination direction of the net holes is changed, and at the moment, on the basis of urea backflushing, impurity particles are basically flushed down, so that the collection is convenient.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The utility model provides a diesel engine machine carries urea injection system, includes nozzle (1), nozzle (1) is connected with urea supply line (2) and compressed gas supply line (3), urea supply line (2) are connected with urea case (4), are equipped with urea pump (5) on urea supply line (2), its characterized in that, be equipped with filter equipment (6) on urea supply line (2), filter equipment (6) are including leading passageway (601), the lateral wall position rotatable filter screen (602) of installing of leading passageway (601), the central point of filter screen (602) puts and has seted up breach (603), the embedded flabellum (604) that is equipped with of breach (603), and the part wire side of filter screen (602) stretches into leading passageway (601) and forms the interception for filter the impurity granule in the urea of filter screen (602) is passed forward, the front channel (601) is divided into a main channel (605) and an auxiliary channel (606) at the rear end of the filter screen (602), the main channel (605) is directly led out, the auxiliary channel (606) firstly passes through the notch (603) in a connecting mode and is used for driving the fan blade (604) and the filter screen (602) to rotate when urea passes through the notch (603), then the auxiliary channel is connected with the rest screen surface which reversely passes through the filter screen (602) and is used for cleaning impurity particles on the screen surface when urea passes through the screen surface, and finally the auxiliary channel is led out.
2. The diesel engine on-board urea injection system of claim 1, characterized in that a pressure sensor (7), a flow meter (8) and an electromagnetic shutoff valve (9) are further arranged on the urea supply pipe (2), and the urea pump (5), the pressure sensor (7), the flow meter (8) and the electromagnetic shutoff valve (9) are all located at a position downstream of the filtering device (6).
3. -urea injection system on board a diesel engine according to claim 1, characterized in that said compressed gas supply duct (3) is provided with a pressure sensor (7).
4. A urea injection system on board a diesel engine as claimed in claim 1, characterized in that said secondary channel (606) connects right through said notch (603).
5. A diesel engine on-board urea injection system according to claim 1, characterized in that the flow cross-section of the primary channel (605) is larger than the flow cross-section of the secondary channel (606).
6. The diesel engine on-board urea injection system of claim 1, characterized in that the filter screen (602) is circular, the partial screen surface of the filter screen (602) passed by the front channel (601) is semi-circular, the notch (603) of the filter screen (602) passed by the secondary channel (606) is circular, and the rest partial screen surface of the filter screen (602) passed by the secondary channel (606) is semi-circular.
7. The system of claim 1, characterized in that the side wall of the filter screen (602) is provided with a plurality of sealing rings (607) for sealing the contact position of each channel wall.
8. An on-board urea injection system for a diesel engine as set forth in claim 1, characterized in that the secondary channel (606) is formed with a buffer chamber (608) at a location across the remaining portion of the screen surface of the filter screen (602), the buffer chamber (608) having a cross-sectional flow area greater than the cross-sectional flow area of the secondary channel (606) at other locations, the buffer chamber (608) being configured to collect cleaned-off impurity particles.
9. The urea injection system on board a diesel engine as recited in claim 8, characterized in that the top end of the buffer chamber (608) is provided with an open-close cover (609), and the rear end position of the buffer chamber (608) is provided with an interception net (610).
10. The diesel engine airborne urea injection system of claim 1, characterized in that the filter screen (602) is vertically installed, all meshes on the screen surface of the filter screen (602) are obliquely arranged with the front end facing the center direction of the filter screen (602), and each mesh is arranged in a structure with large apertures at two ends and small aperture in the middle.
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| CN202110934487.0A CN113864030B (en) | 2021-08-16 | 2021-08-16 | Diesel engine airborne urea injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110934487.0A CN113864030B (en) | 2021-08-16 | 2021-08-16 | Diesel engine airborne urea injection system |
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| CN113864030A CN113864030A (en) | 2021-12-31 |
| CN113864030B true CN113864030B (en) | 2022-06-14 |
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