KR20130137500A - Purifier for exhaust gas - Google Patents
Purifier for exhaust gas Download PDFInfo
- Publication number
- KR20130137500A KR20130137500A KR1020120061178A KR20120061178A KR20130137500A KR 20130137500 A KR20130137500 A KR 20130137500A KR 1020120061178 A KR1020120061178 A KR 1020120061178A KR 20120061178 A KR20120061178 A KR 20120061178A KR 20130137500 A KR20130137500 A KR 20130137500A
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- KR
- South Korea
- Prior art keywords
- exhaust gas
- reducing agent
- air
- unit
- mixing
- Prior art date
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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
- F01N3/023—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
-
- 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
- F01N3/30—Arrangements for supply of additional air
-
- 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
- F01N3/36—Arrangements for supply of additional fuel
-
- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
-
- 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
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
The present invention relates to an exhaust gas purification apparatus, and more particularly, to an exhaust gas purification apparatus capable of stably controlling a flame for raising the temperature of the exhaust gas in a flow field in which fluctuations in the flow rate of the exhaust gas are severe.
The reduction of pollutants emitted from automobiles is one of the major research and development goals of the automobile industry around the world in accordance with recently enforced environmental regulations.
HC, CO, and soot in automobile exhaust gas are comparatively easy to reduce by the improvement of combustion and post-treatment, but the reduction technology of nitrogen oxide suffers from development due to adverse effect on combustion and fuel consumption.
Generally, a diesel engine uses a compression ignition and diffusion combustion mechanism irrespective of the amount of fuel supplied, and even when the fuel and air mixture is lean, the fuel can be burned, resulting in high fuel economy.
This diesel engine has advantages such as high efficiency in low load operation compared with gasoline engine, high fuel economy, lean burning, low HC (Hydro Carbon) and low CO emission. However, in the diffusive combustion process, (PM, Particulate Matter) and NOx (NOx) are emitted in a high region.
Direct injection diesel engines generate large amounts of nitrogen oxides (NOx) under high temperature combustion conditions and generate particulate matter (PM) in relatively fuel-rich areas.
In the case of a direct-injection diesel engine that directly injects fuel into the combustion chamber, the common rail fuel injection system and the electronically controlled fuel injector are used to control the high-pressure injection and injection timing, the injection amount, the injection frequency, .
In addition, in the case of direct injection diesel engines, the common rail fuel injection system improves intake and exhaust system and combustion chamber design to improve the output by improving fuel atomization and fuel and air mixing and air utilization, There is a possibility that pollutant emissions such as PM and NOx can be reduced.
As a method for purifying the exhaust gas by raising the temperature of the flow field in the flow field where the oxygen concentration is low and the flow rate fluctuates considerably, such as the exhaust gas of the diesel engine vehicle or the internal combustion engine for generator as described above, the liquid fuel is atomized and injected, A burner device for maintaining combustion is provided.
BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2010-0000542 (entitled "Nitrogen Oxide Reduction System Using Synthetic Gas and Its Control Method", published on January 6, 2010).
A general exhaust gas purifying apparatus has a problem that the flame is extinguished due to the cooling of the igniter and the sudden change of the flow field due to the liquid fuel injected to provide the flame, There is a problem that it is broken.
Therefore, there is a need for improvement.
An object of the present invention is to provide an exhaust gas purifying apparatus capable of stably controlling a flame for raising the temperature of the exhaust gas in a flow field in which fluctuations in the flow rate of the exhaust gas are severe.
The present invention, the reducing agent supply unit for supplying a reducing agent for reacting with the foreign matter contained in the exhaust gas to extract the foreign matter; A post-processing unit for filtering foreign substances contained in the mixture of the reducing agent and the exhaust gas supplied from the reducing agent supply unit; A burner for heating the exhaust gas and burning the foreign matters filtered by the post-processing unit; And a preheater which preheats the reducing agent supplied to the burner and supplies the burner to the burner.
In addition, the reducing agent supply unit of the present invention, the first fuel pump for supplying the reducing agent supplied from the fuel tank to the mixing unit; And a second fuel pump supplying a reducing agent supplied from the fuel tank to the mixing unit and connected in parallel with the first fuel pump.
In addition, the present invention, the air supply unit for supplying air to be mixed with the reducing agent supplied from the reducing agent supply unit; And a mixing unit supplying the reducing agent supplied from the reducing agent supply unit and the air supplied from the air supply unit to react with the exhaust gas.
In addition, the air supply unit of the present invention, the first air pump to supply air to the mixing unit to be mixed with the reducing agent supplied from the reducing agent supply unit; And a second air pump for supplying air to the mixer of the air supplied from the mixing unit and the reducing agent to be mixed.
In addition, the mixing unit of the present invention, the main body having a first injection portion connected to the reducing agent supply portion and the reducing agent is introduced and the second injection portion to which the air supplied from the first air pump flows; A guide part installed in a flow path through which the first injection part and the second injection part join, and supplying a mixture of a reducing agent and air; And a heater supplying thermal energy to the mixing unit.
In addition, the guide portion of the present invention, the guide rod is inserted into the flow path; And a guide groove formed in a spiral shape on the guide rod and moving the reducing agent and the air in a whirlwind shape.
Further, the post-treatment unit of the present invention includes an oxidation catalyst unit for reacting foreign substances contained in the exhaust gas passing through the burner to extract foreign matter, and a filter unit for filtering the foreign substances contained in the exhaust gas passing through the oxidation catalyst unit .
In addition, the after-treatment unit of the present invention is characterized in that it further comprises a nitrogen oxide reduction unit for filtering foreign matter contained in the exhaust gas passing through the filter unit.
In addition, the preheating unit of the present invention is characterized in that it comprises a fuel supply pipe which is formed in a coil shape to connect the reducer supply unit and the burner and surround the burner.
In addition, the burner of the present invention, the housing is installed in the exhaust pipe exhaust gas is exhausted and the inlet and outlet are formed; A mixing tube installed in the housing and mixing the reducing agent and air supplied from the mixing unit with the air supplied from the air supply unit; An igniter provided in the mixing tube; And a flame holding part for preventing the flame injected from the mixing tube from being turned off by the flow velocity of the exhaust gas.
In addition, the burner of the present invention, the housing is installed in the exhaust pipe exhaust gas is exhausted and the inlet and outlet are formed; A mixing tube installed in the housing and mixing the reducing agent and air supplied from the mixing unit with the air supplied from the air supply unit; An igniter provided in the mixing tube; And a flow generating unit for increasing the mixture of fuel and air supplied to the mixing tube.
Further, the suction port of the present invention is characterized in that a guide pipe having a plurality of guide holes is provided.
In addition, the housing of the present invention is provided with a porous pipe connected to the mixing pipe and guiding the flame and allowing exhaust gas to pass therethrough, and the porous pipe and the guide pipe are installed so as to be parallel to each other.
The flow generating portion of the present invention is characterized by including a swirler installed in the mixing tube and for flowing fuel and air passing through the mixing tube.
In addition, the present invention, the air supply unit for supplying air for burning the foreign matter contained in the exhaust gas; A post-processing unit for filtering foreign substances contained in the air supply unit and the exhaust gas mixer; A burner for heating the exhaust gas and burning the foreign matters filtered by the post-processing unit; And a preheating unit which preheats the air supplied to the burner and supplies the air to the burner.
1 is a configuration diagram illustrating an exhaust gas purifying apparatus according to an embodiment of the present invention.
2 is an exploded perspective view illustrating a mixing section of an exhaust gas purifying apparatus according to an embodiment of the present invention.
3 is an exploded perspective view showing a burner of an exhaust gas purifying apparatus according to an embodiment of the present invention.
4 is a cross-sectional view showing a burner of an exhaust gas purifying apparatus according to an embodiment of the present invention.
5 is a perspective view showing a holding block of an exhaust gas purifying apparatus according to an embodiment of the present invention.
6 is a block diagram illustrating an apparatus for purifying exhaust gas according to an embodiment of the present invention.
7 is a flowchart showing a control method of an exhaust gas purifying apparatus according to an embodiment of the present invention.
8 is a front cutaway perspective view showing a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention.
9 is a rear cutaway perspective view showing a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention.
10 is a sectional view showing a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention.
11 is a perspective view showing a holding block of an exhaust gas purifying apparatus according to another embodiment of the present invention.
Hereinafter, an embodiment of an exhaust gas purifying apparatus according to the present invention will be described with reference to the accompanying drawings.
In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.
In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.
Therefore, definitions of these terms should be made based on the contents throughout this specification.
1 is a configuration diagram illustrating an exhaust gas purifying apparatus according to an embodiment of the present invention.
Referring to FIG. 1, the apparatus for purifying exhaust gas according to an embodiment of the present invention includes a
Fuel injected into the
Further, the fuel supplied from the
Here, the
The reducing agent and the air supplied by the operation of the
Therefore, the liquid low-temperature reducing agent can be prevented from being heated by the preheating
The
The
Therefore, whether or not the
The
The air supplied from the
In order to prevent this, it is necessary to control the flow rate between the
Therefore, it is possible to control the flow rate of the air supplied to the
2 is an exploded perspective view illustrating a mixing section of an exhaust gas purifying apparatus according to an embodiment of the present invention.
1 and 2, the
The
The reducing agent supplied from the
The
The mixture of the reducing agent and air mixed in the
At this time, since the temperature of the mixer is raised by the heat energy supplied from the
Therefore, the purification performance of the exhaust gas purification apparatus can be prevented from being lowered, and the amount of the reducing agent required for the purification operation can be reduced.
Particularly, when the urea water (UREA) for reducing the nitrogen oxide contained in the exhaust gas is used as the reducing agent, the reducing agent is evaporated or pyrolyzed to generate the reducing gas only if the temperature of the reducing agent is maintained at a specific temperature or higher.
In this embodiment, since the number of urea passing through the
One example of the reducing agent via by evaporation at 220 ~ 250 also forms a total hydrocarbon (THC), urea (UREA) is when isopropyl reduced chemical species by pyrolysis at 150 ~ 210 degrees Ansan (HNCO) to ammonia (NH 3) Is generated.
In the mixing
Further, it is possible to prevent the reducing agent from remaining in the flow path of the mixing
The post-processing unit 31 includes an
In the
The
The post-processing unit 31 further includes a nitrogen oxide reduction unit (not shown) for filtering the foreign substances contained in the exhaust gas passing through the
Here, the operation and effect of the
The preheating
A mixture of a reducing agent and air supplied to the
When the reducing agent is heated and evaporated or thermally decomposed by the thermal energy transmitted from the
The preheating
4 is a cross-sectional view of a burner of an exhaust gas purifying apparatus according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view of the burner of the exhaust gas purifying apparatus according to the embodiment of the present invention. 1 is a perspective view showing a holding block of an exhaust gas purifying apparatus according to an embodiment of the present invention.
1 and 3 to 5, the
When the exhaust gas purifying operation is started, the reducing agent and air supplied from the
At this time, the exhaust gas flows into the
The
The
The exhaust gas flowing into the
When the exhaust gas flows inside the
In addition, since foreign matter filtered by the post-processing unit 31 is burned by the flame provided in the mixing
The mixing
The flame generated in the mixing
Accordingly, the exhaust gas flows into the
The mixing
The mixing
A mounting
The inlet of the mixing
The reducing agent and the air supplied through the inlet of the mixing
The
The
When the flame is generated in the mixture of the reducing agent and the air injected through the outlet of the mixing
The exhaust gas flowing into the
When the exhaust gas passes through the
The holding
The metal foam is a metal porous structure formed of a mesh-like metal material to form a block, and an irregular space portion is continuously formed therein.
Therefore, when the mixture of the reducing agent and the air is introduced into the metal foam, it is formed inside the porous structure.
The mixture formed in the metal foam can be prevented from being discharged to the outside of the
The retaining
6 is a block diagram illustrating an apparatus for purifying exhaust gas according to an embodiment of the present invention.
1 and 6, the present embodiment includes an engine
When the start of the engine is started, it is determined whether the vehicle is in a normal state according to signals transmitted from the
A control method of the exhaust gas purifier according to an embodiment of the present invention will now be described.
7 is a flowchart showing a control method of an exhaust gas purifying apparatus according to an embodiment of the present invention.
Referring to FIGS. 1 to 7, a method of controlling an exhaust gas purifying apparatus according to an embodiment of the present invention includes the steps of (S10) detecting a normal state by checking a signal of an exhaust gas purifying apparatus when the internal combustion engine is started, and (S20) of diagnosing the state of the exhaust gas according to a signal transmitted from the exhaust gas purifier and outputting diagnostic contents (S30) of judging whether the state of the exhaust gas purifier is included in the driving condition, (S40) of driving the burner (50) with the amount of reduction agent sprayed in accordance with the engine speed and the inlet temperature of the burner (50) of the exhaust gas purifier with reference to the ignition map if the state of the exhaust gas purifier is included in the driving condition, (S50) of determining the amount of reduction agent injection according to the engine speed and the temperature of the inlet of the burner (50) by referring to the target map when the burner (50) is driven, a step (S50) of reducing the amount of reduction agent injection Article (S70) of adjusting the amount of reducing agent injection according to the stepwise increasing / decreasing strategy so that the outlet temperature of the burner (50) reaches the target temperature; and a step (S80) of judging whether the inlet temperature of the burner (50) has been changed; and a step (S90) of judging whether the outlet temperature of the burner (50) has reached the target temperature when the engine speed and the inlet temperature of the burner And a step (S100) of determining whether the condition for completion of driving the burner (50) is satisfied when the outlet temperature of the burner (50) reaches a target temperature.
When the start of the
At this time, in the
The
When the diagnosis content of the exhaust gas purifier is displayed, it is judged whether or not the state of the exhaust gas purifier is included in the driving conditions.
The driving condition of the
When the
In this case, since the
Either the
The amount of reduction agent injection is determined by the injection amount set in the ignition map stored in the
The air supplied by the
The reducing agent and the air passing through the mixing
At this time, the
The reducing agent of the gas generated by the above-described operation is supplied into the mixing
Since the
The mixer and the air are injected into the
The igniter 55 may ignite either the
At this time, the generated flame extends into the
Therefore, the mixer formed in the holding
The flame is stably maintained without blowing or turning off as described above, so that the temperature of the exhaust gas passing through the
When the
When the
A variety of abrasive jetting amounts are set in the target map so as to achieve a speed signal transmitted from the engine
Therefore, when the
When the
PID control means control by P (Proportional), I (Integral, Integral) and D (Derivative, Derivative).
If the difference between the temperature of the exhaust gas and the target temperature is large, it is possible to increase the heating rate by increasing the injection rate. When the temperature of the exhaust gas is heated close to the target temperature, To a target temperature.
In the present embodiment, assuming that the target temperature is 100 degrees, the
Therefore, the temperature of the exhaust gas can be raised to the target temperature in a relatively short time so that the temperature of the exhaust gas does not exceed the target temperature.
Since the amount of the foreign matter to be filtered by the
It is determined whether or not the engine speed and the inlet temperature of the
The temperature of the exhaust gas at the inlet of the
When the temperature of the exhaust gas reaches the target temperature by the above operation, the
If it is not included in the driving completion condition of the
It is determined whether or not the temperature of the exhaust gas has reached the target temperature and the driving time of the
Of course, the driving completion condition of the
In the present embodiment, if the driving completion condition of the
After the temperature of the exhaust gas reaches the target temperature and the driving completion condition of the
At this time, when the difference between the amount of the reduced agent injection stored in the target map and the amount of the latest reduced agent injection is equal to or greater than the set value, the amount of the reduced agent injection stored in the target map is replaced with the latest amount of the reduced agent injection.
Accordingly, it is possible to store, in the target map, the actual amount of reduction agent injection required to raise the exhaust gas to the target temperature according to the engine speed and the inlet temperature of the
If the difference between the amount of the reduced agent injection stored in the target map and the amount of the latest reduced agent injection is less than the set value, the process proceeds to step S60 in which the reducing agent is injected at a value lower than the set value of the reduced agent injection amount stored in the target map.
Therefore, the
The
It will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the spirit and scope of the invention as set forth in the appended claims.
FIG. 8 is a perspective view showing a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention, FIG. 9 is a rear cut-away perspective view of a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention, FIG. 10 is a sectional view showing a burner of an exhaust gas purifying apparatus according to another embodiment of the present invention, and FIG. 11 is a perspective view showing a holding block of an exhaust gas purifying apparatus according to another embodiment of the present invention.
8 to 11, a
Mixing
At this time, the reducing agent and the air flow in a whirling manner by the
The mixing
A plurality of
Therefore, the mixture flowing from the outer end of the mixing
The
The
The air supplied to the mixing
The air introduced into the mixing
The flame is supplied from the
The suction port of the present embodiment is provided with the
Therefore, it is possible to prevent the exhaust gas flowing into the
The
The exhaust gas flowing into the
The exhaust gas flowing into the
A part of the exhaust gas flowing into the
Therefore, it is possible to effectively prevent the flame from being blown or turned off by the exhaust gas flowing into the
The
The
The swirler 257a rotates the mixer and the air flowing in from the end portion and the circumferential surface of the mixing
The mixer, which is mixed while being swirled by the swirler 257a, is burned by the flames supplied from the
The mixing
The reducing agent supplied along the
At this time, the mixture of the reducing agent and air passes through the
Therefore, it is possible to prevent the flame from being turned off or blown by the flow rate of the exhaust gas.
In addition, since the present embodiment further includes the
The
The holding
The holding
Since the metal foam forming the holding
Therefore, the flame generated by the burning of the mixer is formed to be long outside the holding
This makes it possible to provide an exhaust gas purifying apparatus and a control method thereof capable of reducing the time required for raising the temperature of the exhaust gas in the flow field in which the flow rate of the exhaust gas fluctuates significantly and the amount of injection of fuel and air.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .
Further, although the exhaust gas purifying apparatus has been described as an example, the purifying apparatus of the present invention can also be used for products other than the exhaust gas purifying apparatus.
Accordingly, the true scope of the present invention should be determined by the following claims.
10: internal combustion engine 12: fuel tank
14: fuel injection pump 30: exhaust pipe
32: oxidation catalyst section 34: filter section
50, 250:
52a, 252a:
54, 254: mixing
55b, 255b:
54b, 254b:
56a, 256a:
57a, 262: holding block 58: preheating part
58a, 258a: fuel supply pipe 72: air supply part
72a:
75: Reduction Provided
75b: second fuel pump 77: OBD indicator
78: Flow control valve 80: Mixing part
82: main body 84: first injection section
86: second injection part 87: guide part
87a: Guide rod 87b: Guide groove
88: heater 100:
101: first temperature sensor 102: second temperature sensor
103: third temperature sensor 104: fourth temperature sensor
107: engine speed sensor 264:
266:
Claims (15)
A post-processing unit for filtering foreign substances contained in the mixture of the reducing agent and the exhaust gas supplied from the reducing agent supply unit;
A burner for heating the exhaust gas and burning the foreign matters filtered by the post-processing unit; And
And a preheater for preheating the reducing agent supplied to the burner and supplying the burner to the burner.
A first fuel pump for supplying a reducing agent supplied from a fuel tank to the mixing unit; And
And a second fuel pump for supplying a reducing agent supplied from the fuel tank to the mixing unit and connected in parallel with the first fuel pump.
An air supply unit supplying air to be mixed with the reducing agent supplied from the reducing agent supplying unit; And
And a mixing unit for mixing the reducing agent supplied from the reducing agent supplying unit with the air supplied from the air supplying unit to react with the exhaust gas.
A first air pump supplying air to the mixing unit to mix with the reducing agent supplied from the reducing agent supply unit; And
And a second air pump for supplying air to the mixer of the air supplied from the mixing unit and the reducing agent to mix the air.
A main body connected to the reducing agent supply unit and having a first injection unit into which the reducing agent is introduced and a second injection unit into which air supplied from the first air pump flows;
A guide part installed in a flow path through which the first injection part and the second injection part join, and supplying a mixture of a reducing agent and air; And
And a heater for supplying thermal energy to the mixing unit.
A guide rod inserted into the flow path; And
Exhaust gas purification apparatus is formed in a spiral shape on the guide rod and comprises a guide groove for moving the reducing agent and the air in a whirlwind shape.
An oxidation catalyst unit for extracting foreign substances by reacting foreign substances contained in the exhaust gas passing through the burner; And
Exhaust gas purification apparatus comprising a filter for filtering foreign matter contained in the exhaust gas passing through the oxidation catalyst.
The after-treatment unit further comprises a nitrogen oxide reduction unit for filtering foreign substances contained in the exhaust gas passing through the filter unit.
The preheating unit comprises a fuel supply pipe connected to the reducing agent supply unit and the burner and formed in a coil shape to surround the burner.
A housing installed in an exhaust pipe through which exhaust gas is exhausted and having a suction port and a discharge port formed therein;
A mixing tube installed in the housing and mixing the reducing agent and air supplied from the mixing unit with the air supplied from the air supply unit;
An igniter provided in the mixing tube; And
And a flame holding unit for preventing the flame sprayed from the mixing pipe from being turned off by the flow rate of the discharge gas.
A housing installed in an exhaust pipe through which exhaust gas is exhausted and having a suction port and a discharge port formed therein;
A mixing tube installed in the housing and mixing the reducing agent and air supplied from the mixing unit with the air supplied from the air supply unit;
An igniter provided in the mixing tube; And
And a flow generating part for weighting the mixture of fuel and air supplied to the mixing pipe.
Exhaust gas purification apparatus, characterized in that the inlet is provided with a guide tube formed with a plurality of guide holes.
The housing is coupled to the mixing pipe is installed in the porous pipe for guiding the flame and the discharge gas is passed, the porous pipe and the guide pipe is characterized in that the exhaust gas purification device is installed to be in parallel.
The flow generating unit is installed in the mixing pipe, the exhaust gas purification device comprising a swirler for flowing the fuel and air passing through the mixing pipe.
A post-processing unit for filtering foreign substances contained in the air supply unit and the exhaust gas mixer;
A burner for heating the exhaust gas and burning the foreign matters filtered by the post-processing unit; And
And a preheating unit for preheating the air supplied to the burner and supplying the air to the burner.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020120061178A KR20130137500A (en) | 2012-06-07 | 2012-06-07 | Purifier for exhaust gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020120061178A KR20130137500A (en) | 2012-06-07 | 2012-06-07 | Purifier for exhaust gas |
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KR20130137500A true KR20130137500A (en) | 2013-12-17 |
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KR1020120061178A KR20130137500A (en) | 2012-06-07 | 2012-06-07 | Purifier for exhaust gas |
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2012
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