CN215109092U

CN215109092U - Particulate filter heating device for diesel engine exhaust aftertreatment system

Info

Publication number: CN215109092U
Application number: CN202023313142.3U
Authority: CN
Inventors: 苏继龙; 李会利
Original assignee: Sanhe Keda Science & Technology Co ltd
Current assignee: Sanhe Keda Science & Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-12-10
Anticipated expiration: 2030-12-30

Abstract

The utility model provides a diesel engine exhaust aftertreatment system's particulate filter heating device belongs to the exhaust-gas treatment field. The heating device includes: the device comprises an outer barrel, a flow deflector, a heating pipe, a controller and a temperature sensor; the plurality of flow deflectors are curved surfaces which are inwards concave, and one edge of each curved surface is uniformly fixed on the inner wall of the outer barrel in an oblique line manner; the heating pipe is arranged at the rear part of the outer barrel, the annular heating pipe with the notch is arranged on the junction box through a flange, the ring shape is coaxial with the outer barrel, a connecting terminal of the heating pipe is connected in the junction box, and the voltage of the connecting terminal is driven by a controller; the controller is fixed on the outer wall of the outer barrel and connected with the junction box and the temperature sensor; the sensor is vertically arranged on the inner wall of the outer cylinder in a penetrating way. The utility model can make the particle filter generate carbon particle catalytic oxidation reaction in low load and low power state, and the uniform exhaust effectively improves the reaction efficiency; the soot blocking degree is reduced, the fuel is saved, and the maintenance period of the particle catcher is prolonged.

Description

Particulate filter heating device for diesel engine exhaust aftertreatment system

Technical Field

The utility model belongs to engine exhaust handles the field, concretely relates to diesel engine exhaust aftertreatment system's particulate filter heating device.

Background

Environmental governance is an important subject of current world development, and environmental pollution is harmful to human health. For fuel engines, especially for engine exhaust emission using diesel as raw material, the pollution to the atmospheric environment is serious before the treatment, and in order to treat the pollutants emitted by the engine exhaust emission, the exhaust emission needs to meet the relevant standards of the exhaust emission. An important index for the exhaust emission control of an engine is the emission limit of particulate matters PM and PN.

Currently, control of exhaust particulate matter is generally achieved by incorporating a particulate filter in the exhaust aftertreatment system of a diesel engine. An exhaust gas aftertreatment system comprises a front end oxidation catalytic converter DOC and a rear end particulate filter DPF. An oxidation catalytic converter DOC at the front end for removing HC and CO from the exhaust gas by oxidation catalytic reaction while oxidizing NO to NO₂(ii) a In the rear end particulate filter DPF, carbon particles and NO in the exhaust gas₂Formation of NO and harmless CO₂The active noble metal coating on the DPF oxidizes NO generated in the regeneration reaction to NO₂Newly generated NO₂And reacts with carbon particles to produce NO and harmless CO₂. The process is repeated in such a circulating way, continuous passive regeneration is realized, and meanwhile, the particulate matter PM in the exhaust gas is removed.

In an exhaust gas aftertreatment system for a diesel engine, the PM light-off temperature is 570 ℃ in the absence of a catalyst for a particulate filter, and the PM temperature is 200 to 300 ℃ in the presence of a catalyst for the particulate matter PM and nitrogen dioxide NO in the exhaust gas₂Reacts with the particles (C) to form CO₂The exhaust gas produced during normal operation of the engine can reach the catalytic oxidation reaction temperature. However, when the diesel engine runs under low load, the exhaust temperature is lower than 200 ℃, the temperature of the engine exhaust cannot meet the requirement of the reaction temperature in CDPF, and carbon particles cannot participate in combustion reaction and are deposited in DPF to ensure that DPThe unsmooth carrier channel of F makes the exhaust backpressure increase, causes the engine to be unable normal work.

Disclosure of Invention

In view of the above-mentioned defect or not enough among the prior art, the utility model aims at providing a diesel engine exhaust aftertreatment system's particulate filter heating device, leads the air flue through setting up the heliciform between oxidation catalytic converter DOC and particulate trap DPF, makes exhaust get into DPF after the heating pipe heating, guarantees the regeneration reaction of carbon particle in CDPF to avoid carbon deposit's emergence.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

the embodiment of the utility model provides a diesel engine exhaust aftertreatment system's particulate trap heating device, a serial communication port, heating device includes: the device comprises an outer barrel 1, a flow deflector 2, a heating pipe 3, a controller 4, a temperature sensor 5 and a junction box 6; wherein, the flow deflector 2 and the heating pipe 3 are both arranged inside the outer cylinder 1;

the flow deflectors 2 are at least three and are curved surfaces which are inwards concave, one edge of each curved surface is fixed on the inner wall of the outer barrel 1 in an oblique line manner, and the flow deflectors 2 are uniformly distributed on the inner wall of the outer barrel 1;

the heating pipe 3 is arranged at the rear part of the outer barrel 1, the body of the heating pipe 3 is an annular heating pipe with a mounting flange, the annular heating pipe is coaxial with the outer barrel and is fixed on the bottom plate of a junction box 6 on the inner wall of the outer barrel through a flange, a connecting terminal of the heating pipe is connected in the junction box, the voltage of the connecting terminal is driven by a controller 4 of a feedback signal of a temperature sensor 5, a power supply is DC12V or DC24V provided by a storage battery, and the electric energy of the storage battery is used for driving a direct current generator to charge by an engine; the controller 4 is fixed on the outer wall mounting bracket of the outer cylinder and is connected with the heating pipe 3, the temperature sensor 5 and the storage battery by cables; the sensor is vertically installed on the outer cylinder in a penetrating mode.

The controller 4 and the junction box 6 are fixed on the outer wall of the outer barrel 1, and the controller is connected with the junction box 6 and the temperature sensor 5 at the same time; the junction box 6 is electrically connected with the heating pipe 3;

the temperature sensor 5 is installed on the inner wall of the outer cylinder 1 in a penetrating way.

In the above scheme, the flow deflectors are nine and are uniformly distributed on the inner wall of the outer barrel, and the flow deflectors are obliquely arranged to form a spiral advancing channel of gas, so that the gas passing through the flow deflectors spirally advances and is uniformly distributed.

The embodiment of the utility model provides a technical scheme has following beneficial effect:

when the diesel engine is in a low-load and low-power working state, the spiral flow guide air passage of the heating device is adopted to uniformly distribute exhaust, the exhaust heat loss is reduced as much as possible, the exhaust heat is heated by the heating pipe, the heat is transferred to the DPF reactor through the exhaust to increase the temperature, carbon particle oxidation reaction can also occur in the low-load and low-power working state of the DPF, the uniformly distributed exhaust effectively improves the reaction efficiency, passive regeneration is realized, the particulate matters are reacted and combusted as early as possible, the aggregation of the particulate matters in the carrier filtering passage is reduced, the mechanical working efficiency driven by the engine is improved, the number of active regeneration and the number of soot cleaning for disassembly are reduced, and the working efficiency of the whole engine is improved. The utility model discloses reduced soot and blockked up the degree, practiced thrift the fuel, reduced passive regeneration time, prolonged the maintenance cycle of particle trap.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a perspective view of a particulate filter heating apparatus of a diesel engine exhaust aftertreatment system of the present invention;

FIG. 2 is a front view of a particulate filter heating apparatus of the diesel engine exhaust aftertreatment system of the present invention;

FIG. 3 is a side view of a particulate filter heating apparatus of a diesel engine exhaust aftertreatment system of the present invention.

Description of reference numerals:

1-outer cylinder; 2-flow deflectors; 3-heating the tube; 4-a controller; 5-a temperature sensor; 6-terminal box 6.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a schematic structural view of a particulate filter heating device of a diesel engine exhaust aftertreatment system according to an embodiment of the present invention. As shown in fig. 1, the heating apparatus includes: the device comprises an outer barrel 1, a flow deflector 2, a heating pipe 3, a controller 4, a temperature sensor 5 and a junction box 6; wherein, the flow deflector 2 and the heating pipe 3 are both arranged inside the outer cylinder 1; the flow deflectors 2 are at least three curved surfaces which are inwards concave, one edge of each curved surface is obliquely fixed on the inner wall of the outer barrel 1, and the flow deflectors 2 are uniformly distributed on the inner wall of the outer barrel 1. The heating pipe 3 is a circular heating pipe with a mounting flange, and the circular ring is coaxial with the outer cylinder 1; the connecting terminal is fixed on a bottom plate of the junction box 6 through a flange and is electrically connected with a connecting terminal in the junction box 6; the controller 4 and the junction box 6 are fixed on the outer wall of the outer barrel 1, and the controller is connected with the junction box 6 and the temperature sensor 5 at the same time and is connected with an external power supply; the junction box 6 is electrically connected with the heating pipe 3; the temperature sensor 5 is vertically installed on the inner wall of the outer cylinder 1 in a penetrating way.

As shown in fig. 1, the heating pipe 3 is an annular heating pipe with a mounting flange, is coaxial with the outer cylinder and is fixed on a bottom plate of a junction box 6 on the inner wall of the outer cylinder through a flange, a connecting terminal of the heating pipe is connected in the junction box, the voltage of the connecting terminal is driven by a controller 4 of a feedback signal of a temperature sensor 5, a power supply is DC12V or DC24V provided by a storage battery, and the electric energy of the storage battery is used for driving a direct current generator to charge by an engine; the controller 4 is fixed on the outer wall mounting bracket of the outer cylinder and is connected with the heating pipe 3, the temperature sensor 5 and the storage battery by cables; the sensor is vertically installed on the outer cylinder in a penetrating mode.

As shown in fig. 1, the flow deflectors are nine flow deflectors and are uniformly distributed on the inner wall of the outer barrel, and the flow deflectors are obliquely arranged, so that gas passing through the flow deflectors is homogenized and simultaneously travels to one side, and the flow deflectors form a spiral advancing channel of the gas, so that the exhaust entering the gas inlet is uniformly distributed again. Through the equipartition of water conservancy diversion piece, the exhaust that gets into the heating pipe is more even, realizes thermal homogenization, and the temperature that temperature sensor measured is also more accurate, gets into particle trap's exhaust simultaneously, has not only had the heat that the heating pipe gave, and more even, does benefit to the emergence of reaction, improves exhaust treatment efficiency.

When the diesel engine runs normally, the temperature of the exhaust gas is enough for the regeneration cycle reaction in the DPF, at the moment, the monitoring temperature of the temperature sensor is larger than a critical value, the controller does not electrify the heating pipe, and the heating pipe does not heat the exhaust gas. When the diesel engine is operated at a low load, the heat quantity of exhaust gas is lower than a normal operation value. At this moment, through the utility model discloses the heating device that the embodiment provided has two kinds of situations, and the first, the thermal value of guaranteeing is realized after the exhaust passes through the spiral air flue, has reduced the loss in the circulation of exhaust, and when the exhaust reachs in the DPF, still enough reaction takes place, and the spiral air flue makes the exhaust obtain the equipartition simultaneously, is favorable to improving the reaction efficiency in the DPF; second, the temperature of the exhaust gas itself, while reducing losses during flow-through, is not sufficient to provide heat for the regeneration cycle reactions within the DPF, and the exhaust temperature does not reach soot and NO in the DPF for a long period of time₂The temperature of the catalytic oxidation reaction is lower than 200 ℃, and then carbon particles in the exhaust gas can be gathered in the filtering holes of the DPF carrier and accumulated to a certain degree, so that the channels of the DPF carrier are not smooth, the exhaust back pressure is increased, and the engine can not work normally. Adopt the utility model discloses behind the heating device that embodiment provided, temperature sensor monitored the temperature that crosses of DPF front end temperature was less than the temperature that regeneration cycle reaction needs this moment, with this temperatureAnd setting the temperature value as the critical temperature value of the controller, switching on a power supply for the heating pipe by the controller, and starting heating the exhaust by the heating pipe until the temperature monitored by the temperature sensor is greater than the critical value when the exhaust reaches the front end of the DPF. The controller controls the heating power of the heating pipe to the exhaust gas by controlling the on-off of the power supply of the heating pipe and the magnitude of the current, so that the heat of the exhaust gas ensures the continuous operation of the regeneration cycle reaction in the DPF.

When the heating device of the particle filter of the diesel engine exhaust aftertreatment system is adopted for heating, a spiral flow guide air passage is formed between an oxidation catalytic converter (DOC) and a particle filter (DPF) of the exhaust aftertreatment system through the flow guide sheet, so that exhaust spirally advances along the air passage and is uniformly distributed under the action of the flow guide sheet; finally, after the exhaust gas is discharged from the spiral gas passage, the exhaust gas flows through the heating pipe and then enters the DPF; when the temperature sensor monitors that the temperature of the air passing at the front end of the DPF is lower than a set value, the controller energizes the heating pipe through the junction box to start heating, the heating pipe heats the exhaust flowing through, and the heat carried by the heated exhaust enters the DPF to provide temperature for the reaction in the DPF; when the temperature sensor monitors that the air passing temperature at the front end of the DPF is equal to or higher than a set value, the controller stops supplying power to the heating pipe.

According to the above technical scheme, the utility model provides a diesel engine exhaust aftertreatment system's particulate filter heating device, make diesel engine at the low-load, when low power operating condition, adopt heating device's heliciform water conservancy diversion air flue with the exhaust equipartition, and reduce exhaust calorific loss as far as possible, heat through the heating pipe again, give DPF reactor increase in temperature with the heat transfer via the exhaust, for DPF is at the low-load, carbon particle takes place oxidation reaction also when low power operating condition, and the exhaust of equipartition has effectively improved reaction efficiency, realize passive regeneration, make the particulate matter react the burning as early as possible, with reduce the particulate matter and filter the passageway gathering at the carrier, with the mechanical work efficiency who improves the engine and drive, reduce the initiative regeneration number of times and dismantle and clean the soot number of times, with the work efficiency who improves the complete machine. The utility model discloses reduced soot and blockked up the degree, practiced thrift the fuel, reduced passive regeneration time, prolonged particulate filter's maintenance cycle.

The above description is only a preferred embodiment of the invention and is intended to illustrate the technical principles applied. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features and (but not limited to) technical features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.

Claims

1. A particulate filter heating apparatus of a diesel engine exhaust aftertreatment system, the heating apparatus comprising: the device comprises an outer barrel (1), a flow deflector (2), a heating pipe (3), a controller (4), a temperature sensor (5) and a junction box (6); wherein, the flow deflector (2) and the heating pipe (3) are both arranged inside the outer cylinder (1);

the flow deflectors (2) are at least three and are curved surfaces which are inwards concave, one edge of each curved surface is fixed on the inner wall of the outer barrel (1) in an oblique line manner, and the flow deflectors (2) are uniformly distributed on the inner wall of the outer barrel (1);

the heating pipe (3) is arranged at the rear part of the outer cylinder (1), the heating pipe (3) is a circular heating pipe with a mounting flange, and the circular ring is coaxial with the outer cylinder (1); the connecting terminal is fixed on a bottom plate of the junction box (6) through a flange and is electrically connected with a connecting terminal in the junction box (6);

the controller (4) and the junction box (6) are fixed on the outer wall of the outer barrel (1), and the controller is connected with the junction box (6) and the temperature sensor (5) and is connected with an external power supply; the junction box (6) is connected with the heating pipe (3);

the temperature sensor (5) is arranged on the inner wall of the outer barrel (1) in a penetrating mode.

2. The particle filter heating apparatus as claimed in claim 1, wherein the guide vanes (2) are nine pieces and are uniformly distributed on the inner wall of the outer cylinder (1), and the guide vanes are obliquely arranged to form a spiral advancing passage of the gas, so that the gas passing through the guide vanes (2) is spirally advanced and uniformly distributed.