CN112963225B - Tail gas heating device and tail gas treatment system - Google Patents
Tail gas heating device and tail gas treatment system Download PDFInfo
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- CN112963225B CN112963225B CN202110321861.XA CN202110321861A CN112963225B CN 112963225 B CN112963225 B CN 112963225B CN 202110321861 A CN202110321861 A CN 202110321861A CN 112963225 B CN112963225 B CN 112963225B
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- heating
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- exhaust gas
- tail gas
- shell
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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
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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
- F01N3/025—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 fuel burner or by adding fuel to exhaust
- F01N3/0253—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 fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention relates to a tail gas heating device and a tail gas treatment system, wherein the tail gas heating device comprises: the heating device comprises a shell, a heating channel and a bypass channel are formed in the shell, and the shell is provided with an inlet and an outlet, wherein the inlet is communicated with the heating channel and the bypass channel, and the outlet is communicated with the heating channel and the bypass channel; the heating mechanism is arranged on the shell and used for heating the tail gas flowing through the heating channel; and the control piece is arranged in the bypass channel and used for controlling the bypass channel to be opened and closed. When the exhaust gas post-processor needs to be started to remove pollutants and raise the exhaust temperature, the tail gas flowing through the heating channel can be heated by the heating mechanism, and then the heated tail gas is discharged to the exhaust gas post-processor through the outlet. When not needing to carry out the tail gas heating, directly leading tail gas to the export from the import of casing through bypass channel, need not pass through the heating channel that the structure is complicated, can reduce the resistance when tail gas flows through tail gas heating device, reduce the emission backpressure of engine, prevent that the oil consumption of engine is too big.
Description
Technical Field
The invention relates to the technical field of engine tail gas treatment, in particular to a tail gas heating device and a tail gas treatment system.
Background
Nitrogen oxides and particulates are the main pollutants in the exhaust emission of diesel engines, and in recent years, with the stricter emission regulations, technologies for reducing the emission of two pollutants through an after-treatment mode attract extensive attention.
Generally, an exhaust gas post-processor including an oxidation catalyst, a particulate filter (DPF), and a reduction SCR catalyst is disposed downstream of an engine exhaust gas to process pollutant particles and nitrogen oxides in the exhaust gas.
However, with the increasing severity of emission regulations on NOx limits, NOx emissions during low temperature engine start-up cannot be effectively addressed; meanwhile, soot accumulated by the particle catcher needs to be heated for regeneration. Tail gas heating device effectively lifts engine exhaust temperature at the low temperature start-up in-process, effectively solves NOx emission problem in the low temperature circulation, when the particle trap is full of soot needs regeneration simultaneously, starts the heating and promotes exhaust temperature and reaches the regenerated temperature of burning granule. However, the exhaust gas flowing through the exhaust gas heating device may cause the exhaust back pressure of the engine to be too high, increasing the oil consumption of the engine.
Disclosure of Invention
Based on this, for solving low temperature emission and make the too big problem of engine exhaust backpressure easily to traditional tail gas heating device, provide a tail gas heating device and tail gas processing system.
An exhaust gas heating device, comprising:
the heating device comprises a shell, a heating channel and a bypass channel are formed in the shell, and the shell is provided with an inlet communicated with the heating channel and the bypass channel and an outlet communicated with the heating channel and the bypass channel;
the heating mechanism is arranged on the shell and used for heating the tail gas flowing through the heating channel; and
the control piece is arranged in the bypass channel and used for controlling the bypass channel to be opened and closed.
The tail gas heating device can be arranged between the engine and the tail gas post-processor, tail gas discharged by the engine can enter the heating channel and the bypass channel through the inlet, and finally the tail gas can be discharged from the outlet and enter the tail gas post-processor for purification. In addition, when the temperature of the tail gas needs to be raised during cold start of the engine or regeneration of the tail gas post-processor, the tail gas entering the tail gas post-processor needs to be heated, the tail gas flowing through the heating channel can be heated by the heating mechanism, and then the heated tail gas is discharged to the tail gas post-processor through the outlet. Simultaneously, can close through control bypass passageway, block that the tail gas that total import got into directly flows to the export from bypass passageway, guarantee the heating effect of tail gas. In addition, when need not lift warm to tail gas, bypass channel is opened to the accessible control, and the tail gas that will get into the import is by bypass channel direct guide to exit, and tail gas does not pass through heating channel, can not receive parts such as heating mechanism in the heating channel and hinder, reduces tail gas flow through tail gas heating device's resistance, prevents that the exhaust back pressure of engine is too high, prevents that the oil consumption of engine is too high.
In one embodiment, the exhaust gas heating device comprises a heating state and a non-heating state;
in the heating state, the heating mechanism works, and the control piece controls the bypass channel to be closed;
in the non-heating state, the control member controls the bypass passage to be opened.
In one embodiment, the housing includes an inner shell and an outer shell, the inner shell is sleeved in the outer shell at intervals, and the heating channel includes a first flow channel formed between the inner shell and the outer shell and a second flow channel inside the inner shell; the first flow passage is communicated with the inlet, the second flow passage is communicated with the outlet, and a through hole for communicating the first flow passage with the second flow passage is formed in the inner shell;
the heating mechanism can at least partially extend into the second flow passage to form combustion airflow, and the through hole allows tail gas in the first flow passage to enter the second flow passage to be mixed with the combustion airflow and then flow to the outlet.
In one embodiment, the casing further includes a baffle plate, the baffle plate is disposed on a side of the inner casing facing the first flow channel, and the baffle plate covers a portion of the through hole.
In one embodiment, the heating mechanism comprises an oil injection piece and an ignition piece, the oil injection piece is arranged on the shell and used for injecting oil mixed with air to the second flow passage, and the ignition piece is arranged on the shell and at least partially extends into the second flow passage and used for igniting the oil to form the combustion airflow.
In one embodiment, the oil injection piece is provided with an oil injection channel and an air injection channel which are communicated with the second flow channel, the air injection channel drives air to form an air flow injection path in the second flow channel, and the oil injection path is at least partially overlapped with an oil liquid injection path which is formed by the oil injection channel and drives oil liquid in the second flow channel.
In one embodiment, the air injection channel is spirally arranged.
In one embodiment, the housing further includes an inlet duct having the inlet, an outlet duct having the outlet, and a bypass duct having the bypass channel, the inlet duct and the outlet duct are both disposed on the housing, the inlet duct is communicated with the first flow channel, the outlet duct is communicated with the second flow channel, and the bypass duct is connected between the inlet duct and the outlet duct.
In one embodiment, the control member is an electrically controlled butterfly valve.
A tail gas treatment system comprises a tail gas post-processor and the tail gas heating device, wherein the tail gas heating device is arranged at the upstream of the tail gas post-processor.
Drawings
FIG. 1 is a schematic structural diagram of an exhaust gas heating apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view showing a structure of an oil jet member in the exhaust gas heating apparatus shown in fig. 1.
100. A tail gas heating device; 10. a housing; 11. a heating channel; 12. an inner shell; 121. a first flow passage; 123. a second flow passage; 125. a through hole; 14. a housing; 15. an air intake duct; 151. an inlet; 16. an air outlet pipe; 161. an outlet; 17. a bypass conduit; 171. a bypass channel; 18. a baffle plate; 30. a heating mechanism; 32. an oil injection piece; 321. an oil injection channel; 323. an air injection passage; 34. an ignition member; 40. a control member; 50. a photosensitive sensor; 70. a temperature sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
As described in the background of the invention, the conventional exhaust gas heating device increases the exhaust back pressure of the engine, and the inventor researches and finds that the root cause of the problem is that the heating flow channel inside the exhaust gas heating device is complex in structure, and the resistance to the airflow flowing through the exhaust gas heating device is large, thereby increasing the exhaust back pressure of the engine.
Referring to fig. 1, in an embodiment of the present invention, an exhaust gas heating apparatus 100 is provided, where the exhaust gas heating apparatus 100 may be disposed between an engine and an exhaust gas post-processor, and is used to heat exhaust gas entering the exhaust gas post-processor, so as to facilitate raising an exhaust gas temperature under a low temperature condition, which is beneficial to reducing NOx pollutants, and facilitate particle combustion to realize a regeneration function.
In some embodiments, the exhaust gas heating apparatus 100 includes a housing 10, a heating mechanism 30 and a control member 40, a heating channel 11 and a bypass channel 171 are formed inside the housing 10, and the housing 10 is provided with an inlet 151 communicated with the heating channel 11 and the bypass channel 171, and an outlet 161 communicated with the heating channel 11 and the bypass channel 171. Thus, if the exhaust gas heating device 100 is disposed between the engine and the exhaust gas post-processor, the exhaust gas discharged from the engine can enter the heating channel 11 and the bypass channel through the inlet 151, and finally can be discharged from the outlet 161 and enter the exhaust gas post-processor for purification. In addition, the heating mechanism 30 is disposed on the housing 10 for heating the exhaust gas flowing through the heating channel 11; the control member 40 is provided in the bypass passage 171 to control the opening and closing of the bypass passage 171. When the engine is started in a cold state or the exhaust gas post-processor needs to be started for regeneration, the exhaust gas entering the exhaust gas post-processor needs to be heated, at this time, the exhaust gas flowing through the heating channel 11 can be heated by the heating mechanism 30, and then the heated exhaust gas is discharged to the exhaust gas post-processor through the outlet 161. Meanwhile, the control member 40 can control the bypass channel 171 to close, so that the exhaust entering from the inlet 151 can be blocked from directly flowing from the bypass channel 171 to the outlet 161, and the heating effect of the exhaust can be ensured. In addition, when the exhaust gas does not need to be warmed, the bypass channel 171 can be opened through the control member 40, the exhaust gas entering the inlet 151 is directly guided to the outlet 161 through the bypass channel 171, the exhaust gas does not pass through the heating channel 11 and cannot be obstructed by the heating mechanism 30 and other components in the heating channel 11, the resistance of the exhaust gas flowing through the exhaust gas heating device 100 is reduced, the exhaust back pressure of the engine is prevented from being too high, and the oil consumption of the engine is prevented from being too high.
Optionally, the control member 40 is an electrically controlled butterfly valve, the opening and closing of which is automatically controlled by a power signal.
In some embodiments, the exhaust gas heating apparatus 100 includes a heated state and a non-heated state; in the heating state, the heating mechanism 30 is operated, and the control member 40 controls the bypass passage 171 to be closed; in the non-heating state, the control member 40 controls the bypass passage 171 to be opened. When the exhaust gas post-processor needs to be warmed up to process NOx or particulates, the exhaust gas heating device 100 is in a heating state to raise the temperature of the exhaust gas by the heating mechanism 30 to meet the pollutant treatment requirement. When the temperature does not need to be raised, the tail gas heating device 100 is in a non-heating state, so that the bypass channel 171 in the tail gas heating device 100 is communicated, the tail gas can be discharged through the bypass channel 171 and does not pass through a heating channel with a complex internal structure, the resistance of the tail gas flowing through the tail gas heating device 100 is reduced, the exhaust back pressure of the engine is reduced, and the oil consumption of the engine is prevented from being too high.
It is understood that the heating mechanism 30 can be an electric heating element, a microwave heating element or an oil-spraying combustion-supporting element, and the heating mechanism 30 is described as an oil-spraying combustion-supporting element in the following.
In some embodiments, the housing 10 includes an inner shell 12 and an outer shell 14, the inner shell 12 is disposed in the outer shell 14 at an interval, the heating channel 11 includes a first flow channel 121 formed between the inner shell 12 and the outer shell 14 and a second flow channel 123 inside the inner shell 12; the first flow passage 121 is communicated with the inlet 151, the second flow passage 123 is communicated with the outlet 161, and the inner shell 12 is provided with a through hole 125 for communicating the first flow passage 121 and the second flow passage 123; the heating mechanism 30 can at least partially extend into the second flow channel 123 for forming a combustion gas flow, and the through hole 125 allows the tail gas in the first flow channel 121 to enter the second flow channel 123 to be mixed with the combustion gas flow and then flow to the outlet 161. In other words, when the heating mechanism 30 works, a combustion airflow with a higher temperature can be formed in the second flow channel 123, and then the tail gas in the first flow channel 121 can enter the second flow channel 123 through the through hole 125 on the inner shell 12 to mix with the combustion airflow, so as to increase the temperature of the tail gas.
Further, the heating mechanism 30 includes an oil injection member 32 and an ignition member 34, the oil injection member 32 is disposed on the housing 10 and used for injecting oil mixed with air into the second flow passage 123, and the ignition member 34 is disposed on the housing 10 and at least partially extends into the second flow passage 123 for igniting the oil to form a combustion gas flow. The oil injection member 32 mixes air and oil and then feeds the mixture into the second flow passage 123, and then the oil in the second flow passage 123 is ignited by the ignition member 34, and the oil is combusted to form high-temperature combustion air, so that the temperature is increased by mixing the combustion air with exhaust gas.
In the present embodiment, the fuel injection member 32 and the ignition member 34 are located upstream of the second flow passage 123, and the through hole 125 formed in the inner casing 12 is located downstream of the second flow passage 123. The fuel is injected and ignited at the upstream of the second flow path 123 to form combustion gas, and then the combustion gas flows downstream to be mixed with the exhaust gas entering from the through hole 125, thereby achieving the effect of heating the exhaust gas. Alternatively, the oil jet 32, the ignition element 34, and the through hole 125 are provided at a time along the air flow path in the second flow passage 123. Optionally, the exhaust gas heating apparatus 100 further includes a photosensitive sensor 50 and a temperature sensor 70, wherein the photosensitive sensor 50 is disposed between the ignition element 34 and the through hole 125, and is used for detecting whether a combustion flame is formed or not and detecting a combustion condition of the oil. The temperature sensor 70 is disposed between the through hole 125 and the outlet 161, and detects the temperature of the exhaust gas mixed with the combustion gas to know the heating condition of the exhaust gas.
Referring to fig. 1 and fig. 2, the oil injection member 32 further includes an air injection passage 323 and an oil injection passage 321 both connected to the second flow passage 123, wherein the air injection passage 323 drives the air to form an air injection path in the second flow passage 123, and the oil injection path formed by the oil injection passage 321 driving the oil in the second flow passage 123 at least partially coincides with the air injection path. Equivalently, the oil and the air respectively enter the second flow passage 123 through the oil injection passage 321 and the air injection passage 323, and the injection path after the oil enters the second flow passage 123 and the injection path after the air enters the second flow passage 123 are at least partially overlapped, so that the oil and the air can be fully mixed, and then the oil and the air enter the downstream of the second flow passage 123 under the air pressure of the oil and the air to prepare for combustion. Optionally, the jet pipe is spirally arranged, so that air is continuously sprayed into the second flow channel 123 through the jet pipe in a spiral manner, and oil sprayed by the oil spraying pipe can form a large mixing area with air in the spiral flow channel, thereby improving the oil-air mixing effect.
In some embodiments, the casing 10 further includes a baffle 18, the baffle 18 is disposed on a side of the inner casing 12 facing the first flow passage 121, and the baffle 18 blocks a portion of the through hole 125. Equivalently, the baffle 18 is obliquely blocked at one side of the through hole 125, so that the tail gas flowing from the first flow channel 121 to the second flow channel 123 can be decelerated, the tail gas is prevented from suddenly entering the second flow channel 123 and then blowing out combustion flame, and meanwhile, the decelerated tail gas passing through the baffle 18 can be more uniformly mixed with combustion gas in the second flow channel 123.
In some embodiments, the housing 10 further includes an inlet duct 15 having an inlet 151, an outlet duct 16 having an outlet 161, and a bypass duct having a bypass channel 171, wherein the inlet duct 15 and the outlet duct 16 are both disposed on the outer shell 14, the inlet duct 15 is communicated with the first flow channel 121, the outlet duct 16 is communicated with the second flow channel 123, and the bypass duct is connected between the inlet duct 15 and the outlet duct 16. The exhaust gas may flow through the inlet 151 to the inlet duct 15, then enter the first flow channel 121, then enter the second flow channel 123 through the through hole 125 on the inner shell 12, mix with the combustion gas, flow to the outlet duct 16, and finally exit from the outlet 161 of the outlet duct 16. Alternatively, the exhaust gas flows through the inlet 151 to the inlet duct 15, then enters the bypass duct, and then enters the outlet duct 16 to be discharged from the outlet 161.
In the exhaust gas heating apparatus 100, the bypass channel 171 is provided, so that when exhaust gas heating is not required, the exhaust gas is directly guided to the outlet 161 from the inlet 151 of the housing 10 through the bypass channel 171, and the heating channel 11 with a complicated structure is not required, so that resistance when the exhaust gas flows through the exhaust gas heating apparatus 100 can be reduced, emission back pressure of the engine can be reduced, and the excessive oil consumption of the engine can be prevented.
Based on the same inventive concept, in an embodiment of the present invention, an exhaust gas treatment system is further provided, including an exhaust gas post-processor and the exhaust gas heating device 100, where the exhaust gas heating device 100 is disposed upstream of the exhaust gas post-processor, when the exhaust gas heating device is required to raise the exhaust temperature for treating pollutants, the temperature of the exhaust gas can be raised through the heating channel 11 in the exhaust gas heating device 100, and when the exhaust gas is not required to be raised, the exhaust gas can be directly led out through the bypass channel 171 in the exhaust gas heating device 100, so as to reduce the flow resistance of the exhaust gas, and prevent the exhaust back pressure of the engine from being too large to increase the oil consumption.
Specifically, the exhaust gas heating device 100 includes a housing 10, a heating mechanism 30 and a control member 40, a heating channel 11 and a bypass channel 171 are formed inside the housing 10, and an inlet 151 communicated with the heating channel 11 and the bypass channel 171 and an outlet 161 communicated with the heating channel 11 and the bypass channel 171 are opened on the housing 10. Thus, if the exhaust gas heating device 100 is disposed between the engine and the exhaust gas post-processor, the exhaust gas discharged from the engine can enter the heating channel 11 and the bypass channel through the inlet 151, and finally can be discharged from the outlet 161 and enter the exhaust gas post-processor for purification. In addition, the heating mechanism 30 is disposed on the housing 10 for heating the exhaust gas flowing through the heating channel 11; the control member 40 is provided in the bypass passage 171 to control the opening and closing of the bypass passage 171. When it is desired to heat the exhaust gas entering the exhaust gas after-treatment device, the exhaust gas flowing through the heating channel 11 can be heated by the heating mechanism 30, and then the heated exhaust gas is discharged to the exhaust gas after-treatment device through the outlet 161. Meanwhile, the control member 40 can control the bypass channel 171 to close, so that the exhaust entering from the inlet 151 can be blocked from directly flowing from the bypass channel 171 to the outlet 161, and the heating effect of the exhaust can be ensured. In addition, when the exhaust gas post-processor does not need to perform a regeneration function, the bypass channel 171 can be opened by the control member 40, the exhaust gas entering the inlet 151 is directly guided to the outlet 161 by the bypass channel 171, the exhaust gas does not pass through the heating channel 11 and is not obstructed by the heating mechanism 30 and other components in the heating channel 11, the resistance of the exhaust gas flowing through the exhaust gas heating device 100 is reduced, the exhaust back pressure of the engine is prevented from being too high, and the oil consumption of the engine is prevented from being too high.
Optionally, the control member 40 is an electrically controlled butterfly valve, the opening and closing of which is automatically controlled by a power signal.
In some embodiments, the exhaust gas heating apparatus 100 includes a heated state and a non-heated state; in the heating state, the heating mechanism 30 is operated, and the control member 40 controls the bypass passage 171 to be closed; in the non-heating state, the control member 40 controls the bypass passage 171 to communicate. When the exhaust gas post-processor needs to process pollutants under special working conditions and the exhaust gas temperature needs to be raised, the exhaust gas heating device 100 is in a heating state, so that the temperature of the exhaust gas is raised through the heating mechanism 30 to meet the requirement of removing the pollutants. When tail gas is not required to be heated, the tail gas heating device 100 is in a non-heating state, so that the bypass channel 171 in the tail gas heating device 100 is communicated, the tail gas can be discharged through the bypass channel 171 and does not pass through a heating channel with a complex internal structure, the resistance of the tail gas flowing through the tail gas heating device 100 is reduced, the exhaust back pressure of the engine is further reduced, and the oil consumption of the engine is prevented from being too high.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
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 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. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An exhaust gas heating device, comprising:
the heating device comprises a shell, a heating channel and a bypass channel are formed in the shell, and the shell is provided with an inlet and an outlet, wherein the inlet is communicated with the heating channel and the bypass channel, and the outlet is communicated with the heating channel and the bypass channel;
the heating mechanism is arranged on the shell and used for heating the tail gas flowing through the heating channel; and
the control element is arranged in the bypass channel and used for controlling the bypass channel to be opened and closed; the tail gas heating device comprises a heating state and a non-heating state;
in the heating state, the heating mechanism works, and the control piece controls the bypass channel to be closed;
in the non-heating state, the control part controls the bypass channel to be opened;
the heating mechanism comprises an oil injection piece and an ignition piece, the oil injection piece is arranged on the shell and used for injecting oil mixed with air to the heating channel, and the ignition piece is arranged on the shell and at least partially extends into the heating channel and is used for igniting combustion airflow formed by the oil;
the oil injection piece is provided with an oil injection channel and an air injection channel which are communicated with the heating channel, the air injection channel drives air to form an air flow injection path in the heating channel, the air flow injection path is at least partially overlapped with an oil liquid injection path formed by oil liquid driven by the oil injection channel in the heating channel, and the air injection channel is spirally arranged around the oil injection channel.
2. The exhaust gas heating device according to claim 1, wherein the housing includes an inner shell and an outer shell, the inner shell is disposed in the outer shell in a spaced-apart manner, and the heating passage includes a first flow passage formed between the inner shell and the outer shell and a second flow passage formed inside the inner shell; the first flow passage is communicated with the inlet, the second flow passage is communicated with the outlet, and a through hole for communicating the first flow passage with the second flow passage is formed in the inner shell;
the heating mechanism can at least partially extend into the second flow passage and is used for forming the combustion airflow, and the through hole allows tail gas in the first flow passage to enter the second flow passage to be mixed with the combustion airflow and then flow to the outlet.
3. The exhaust gas heating apparatus according to claim 2, wherein the casing further comprises a baffle disposed on a side of the inner casing facing the first flow channel, and the baffle covers a portion of the through hole.
4. The exhaust gas heating apparatus according to claim 2, wherein the oil injection member is disposed on the housing and adapted to inject an oil mixed with air into the second flow passage, the oil injection passage and the air injection passage are both in communication with the second flow passage, and the ignition member is disposed on the housing and at least partially extends into the second flow passage and adapted to ignite the oil to form the combustion gas flow.
5. The exhaust gas heating apparatus according to any one of claims 2 to 4, wherein the housing further comprises an inlet duct having the inlet, an outlet duct having the outlet, and a bypass duct having the bypass channel, the inlet duct and the outlet duct are both disposed on the housing, and the inlet duct is communicated with the first flow channel, the outlet duct is communicated with the second flow channel, and the bypass duct is connected between the inlet duct and the outlet duct.
6. The exhaust gas heating apparatus according to any one of claims 1 to 4, wherein the control member is an electrically controlled butterfly valve.
7. An exhaust gas treatment system comprising a diesel exhaust gas after-processor and an exhaust gas heating device according to any of claims 1 to 6, the exhaust gas heating device being located upstream of the diesel exhaust gas after-processor.
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