CN215444201U

CN215444201U - Gas heating device, mixing device, processing system and vehicle

Info

Publication number: CN215444201U
Application number: CN202121227192.1U
Authority: CN
Inventors: 曹学涛; 钱伟; 邱林建
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-01-07
Anticipated expiration: 2031-06-02

Abstract

The embodiment of the application provides a gas heating device, a mixing device, a treatment system and a vehicle, and belongs to the technical field of automobile exhaust emission. The gas heating device comprises a gas cavity and a heating part, wherein both ends of the gas cavity are respectively connected with a gas inlet pipe and a gas outlet pipe; the heating part is used for heating the gas in the gas cavity; the gas outlet pipe is used for being connected with the exhaust aftertreatment mixing device so as to input the heated gas into the exhaust aftertreatment mixing device. Aims to accelerate the hydrolysis pyrolysis reaction of urea and fully mix the urea aqueous solution and the tail gas.

Description

Gas heating device, mixing device, processing system and vehicle

Technical Field

The embodiment of the application relates to the technical field of automobile exhaust emission, in particular to a gas heating device, a mixing device, a treatment system and a vehicle.

Background

In order to meet global climate change, countries have raised higher requirements for emission pollutant limits of automobiles, and Urea selective catalytic reduction (Urea-SCR) technology is generally adopted to reduce NOx emission in automobile exhaust.

At present, in a diesel engine exhaust aftertreatment system with SCR, a selective catalytic reduction device and a urea injection device are generally arranged in an exhaust pipeline, and a urea aqueous solution is added into a mixing cavity through the urea injection device, so that the urea aqueous solution and exhaust gas are mixed, and the content of NOx in the exhaust gas is further reduced.

However, because the SCR is usually disposed below the chassis, heat loss in the exhaust pipe is relatively high, the temperature in the SCR mixing chamber is relatively low, and the urea hydrolysis pyrolysis reaction efficiency is low, so that the catalytic reaction is affected, and the conversion efficiency of NOx is reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a gas heating device, a mixing device, a treatment system and a vehicle, aims at accelerating the hydrolysis pyrolysis reaction of urea and fully mixes urea aqueous solution and tail gas.

In a first aspect, an embodiment of the present application provides a gas heating apparatus, which includes a gas chamber and a heating portion, where two ends of the gas chamber are respectively connected to a gas inlet pipe and a gas outlet pipe;

the heating part is used for heating the gas in the gas cavity;

the gas outlet pipe is used for being connected with the exhaust aftertreatment mixing device so as to input the heated gas into the exhaust aftertreatment mixing device.

Optionally, the heating part is independently disposed in the gas chamber or on the gas inlet pipe.

Optionally, the heating part includes a heat pipe, one end of the heat pipe is used for connecting with the back end of the turbocharger turbine, and the other end of the heat pipe is connected with the gas cavity.

Optionally, an electromagnetic valve is arranged on the intake pipe, and the electromagnetic valve is used for controlling the flow rate of intake air.

Optionally, the electromagnetic valve further comprises a monitoring unit and a control unit, wherein an output end of the monitoring unit is connected with an input end of the control unit, and an output end of the control unit is connected with the electromagnetic valve;

the monitoring unit is used for monitoring the working condition information of the current engine;

and the control unit is used for adjusting the opening angle of the electromagnetic valve according to the current working condition information of the engine.

In a second aspect, embodiments of the present application provide a mixing device for exhaust gas aftertreatment, comprising a gas heating device as provided in the first aspect of the embodiments;

the input end of the mixing device is respectively connected with the gas outlet pipe and the exhaust pipe of the gas heating device;

the output end of the mixing device is used for being connected with the selective catalytic reducer.

In a third aspect, embodiments of the present application provide an exhaust aftertreatment system including a gas heating device as provided in the first aspect of the embodiments.

Optionally, the system further comprises a turbocharger, wherein the turbocharger comprises a rear-end pressing end, and the rear-end pressing end of the turbocharger is respectively connected with the air inlet pipe of the gas heating device and the air inlet of the engine.

In a fourth aspect, embodiments of the present application provide a vehicle including a gas heating apparatus provided in the first aspect of the embodiments.

Has the advantages that:

when handling tail gas, connect gas heating device's outlet duct on exhaust aftertreatment mixing arrangement, add gas to the gas cavity through the intake pipe to utilize the heating portion to heat the gas in the gas cavity, thereby the gas flow after the heating flows to exhaust aftertreatment mixing arrangement in, and then accelerates the hydrolysis pyrolysis reaction of urea, makes urea aqueous solution and tail gas intensive mixing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic view of a gas heating apparatus according to an embodiment of the present application.

Fig. 2 is a schematic connection diagram of a heat pipe according to an embodiment of the present application.

Description of reference numerals: 11. a gas chamber; 12. a heat pipe; 13. an air inlet pipe; 14. an air outlet pipe; 15. an electromagnetic valve; 16. a monitoring unit; 17. a control unit; 2. a turbocharger; 21. pressing the rear end; 22. a vortex back end; 23. a temperature chamber; 31. a mixing chamber; 32. a urea injection device; 33. a selective catalytic reducer; 4. an air cleaner; 5. a catalyst; 6. a particle trap; 7. and a silencing module.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example one

The embodiment of the application provides a gas heating device, referring to fig. 1 and 2, which comprises a gas cavity 11 and a heating part, wherein two ends of the gas cavity 11 are respectively connected with a gas inlet pipe 13 and a gas outlet pipe 14; the heating part is used for heating the gas in the gas cavity 11; the outlet pipe 14 is adapted to be connected to an exhaust aftertreatment mixing device to input heated gases into the exhaust aftertreatment mixing device.

The gas is introduced into the gas chamber 11 through the inlet pipe 13, and then the air in the gas chamber 11 is heated by the heating part, so that the temperature of the gas discharged from the outlet pipe 14 can be increased.

In the exhaust emission field, add the air after the heating to corresponding exhaust aftertreatment mixing arrangement in, can not only make the temperature rise among the treatment mixing arrangement to can improve the air current disturbance nature among the treatment mixing arrangement, thereby can accelerate the hydrolysis pyrolysis reaction of urea, make urea aqueous solution and tail gas intensive mixing.

In a possible embodiment, the heating portion is independently disposed in the gas chamber 11 or on the gas inlet pipe 13, for example, the heating portion can adopt various manners such as resistance heating, induction heating, infrared heating, and the like, and specifically can be an electric heating pipe 12 and a heating device such as an electric heating wire, for example, the heating wire can be coaxially wound around the gas inlet pipe 13, and the heating wire can also be disposed in the gas chamber 11, so as to raise the temperature of the gas discharged from the gas outlet pipe 14.

In another possible embodiment, when the gas heating apparatus is applied in the exhaust gas emission field, the heating portion may be a heat pipe 12, and the heat pipe 12 is a heat transfer element, which makes full use of the heat conduction principle and the rapid heat transfer property of the phase change medium, and transfers the heat of the heat generating object to the outside of the heat source through the heat pipe 12, and the heat transfer capability of the heat generating object is stronger than the heat transfer capability of metal.

In practical use, one end of the heat pipe 12 is used for connecting the vortex rear end 22 of the turbocharger 2, and the other end of the heat pipe 12 is connected with the gas cavity 11, specifically, a temperature cavity 23 can be communicated and arranged behind the vortex rear end 22, so that the exhaust gas flowing out of the vortex rear end 22 flows through the temperature cavity 23, one end of the heat pipe 12 is inserted in the temperature cavity 23, the other end of the heat pipe 12 is inserted in the gas cavity 11, and a heat insulation piece can be arranged at the position where the heat pipe 12 is connected with the temperature cavity 23 and the gas cavity 11, so that the loss of heat can be reduced to a certain extent; and the effect of enhancing heat conduction can be achieved by using a plurality of groups of parallel heat pipes 12 at the same time.

Because the vortex rear end 22 of the turbocharger 2 is the position through which the engine exhaust gas flows, and the engine exhaust gas contains certain heat, when the exhaust gas with a temperature higher than that of air flows through the temperature cavity 23, the heat pipe 12 conducts the temperature in the exhaust gas to the gas cavity 11, so that the temperature in the gas cavity 11 can be increased, and the effect of heating the gas in the gas cavity 11 is realized.

Because the gas flow of the gas inlet pipe 13 determines the flow of the gas flowing out of the gas pipe 14 to a certain extent, the gas inlet pipe 13 is provided with an electromagnetic valve 15 for controlling the flow of the hot gas flow added into the exhaust gas post-treatment mixing device, and the electromagnetic valve 15 is used for controlling the gas inlet flow rate.

In a possible embodiment, the gas heating device further includes a monitoring unit 16 and a control unit 17, an output end of the monitoring unit 16 is connected with an input end of the control unit 17, and an output end of the control unit 17 is connected with the electromagnetic valve 15; the monitoring unit 16 is used for monitoring the working condition information of the current engine; and the control unit 17 is used for adjusting the opening angle of the electromagnetic valve 15 according to the current working condition information of the engine.

The control unit 17 may be a general-purpose processor including a central processing unit, a network processor, etc., or a digital signal processor such as an application specific integrated circuit or other programmable logic device, and a storage medium such as a register or a memory is integrated on the processor, or a storage medium independent of the processor and connected to the processor such as a random access memory.

Different working condition information of the current engine corresponds to different opening and closing degrees of the electromagnetic valve 15, and the one-to-one corresponding relation between the working condition information and the opening and closing degrees of the electromagnetic valve 15 is stored in a storage medium in advance; the monitoring unit 16 may be connected to an engine controller ECU of the vehicle and monitors the working condition information of the engine in real time, and the control unit 17 adjusts the opening angle of the electromagnetic valve 15 according to the current working condition information of the engine.

Because under low-speed low-load working condition, because air flow velocity in the exhaust passage is on the low side, and then the air flow disturbance nature among the processing mixing device is not abundant, and then urea aqueous solution and waste gas mix inhomogeneously, cause the emergence of urea crystallization problem easily, consequently when monitoring the engine under low-speed low-load working condition at monitoring unit 16, the control unit 17 can make solenoid valve 15's opening angle increase, and then gas heating device can accelerate the velocity of flow of hot gas stream, correspondingly, can improve the air flow disturbance nature among the processing mixing device, make urea aqueous solution and waste gas mix more evenly.

Example two

Based on the same inventive concept, the present application provides a mixing device for exhaust gas aftertreatment, and referring to fig. 1, the mixing device includes a mixing chamber 31, a urea injection device 32, and a selective catalytic reduction device 33, and further includes a gas heating device provided in the first embodiment.

Wherein, the input end of the mixing cavity 31 is respectively connected with the gas outlet pipe 14 of the gas heating device and the exhaust pipe, and the output end of the mixing cavity 31 is used for connecting with the selective catalytic reduction device 33; and a urea injection device 32 for adding an aqueous urea solution to the mixing chamber 31.

Waste gas flows into the mixing cavity 31 through the exhaust pipe, the urea water solution is sprayed into the waste gas by the urea spraying device 32, hot air flow is added into the mixing cavity 31 by the gas heating device, the flow rate of the hot air flow can be adjusted according to the difference of the current working conditions of the engine, the hydrolysis pyrolysis reaction of urea is accelerated, the urea water solution is fully mixed with tail gas, then the waste gas and the urea water solution pass through the selective catalytic reduction device 33, the reduction reaction is carried out under the action of a catalyst, and finally, the waste gas is discharged, so that the emission of NOx can be reduced to a certain extent.

EXAMPLE III

Based on the same inventive concept, another embodiment of the present application provides an exhaust gas aftertreatment system, and referring to fig. 1, in a possible implementation, the exhaust gas aftertreatment system includes a gas heating device, an air cleaner 4, a turbocharger 2, an exhaust gas primary treatment device, a mixing device for exhaust gas aftertreatment, and a sound attenuation module 7.

The output end of the air filter 4 is connected with the rear end 21 of the turbocharger 2, the rear end 22 of the turbocharger 2 is connected with the input end of the tail gas primary treatment device, the output end of the tail gas primary treatment device is connected with the input end of the mixing device for exhaust aftertreatment, namely, the output end of the tail gas primary treatment device is connected with the receiving end of the mixing cavity 31, and the output end of a selective catalytic reduction device 33 in the mixing device for exhaust aftertreatment is connected with the noise elimination module 7.

The turbocharger 2 pushes a turbine in a turbine chamber through inertia impulsive force of exhaust gas exhausted by an engine, so that air can enter a cylinder at high pressure, the turbocharger 2 comprises a rear pressing end 21 and a rear vortex end 22, the rear pressing end 21 is one end through which clean air flows, and the rear vortex end 22 is one end through which exhaust gas of the engine flows.

Specifically, the rear end 21 of the turbocharger 2 is connected to the intake pipe 13 of the gas heating device and the intake port of the engine, and under the pressure of the turbocharger 2, the outside air is filtered by the air filter 4 and then pressurized by the turbocharger 2, and part of the clean air flows into the engine to be combusted, and part of the clean air flows into the gas chamber 11 through the intake pipe 13.

Exhaust gas generated after engine combustion flows through the turbine rear end 22 of the turbocharger 2 and provides power to the turbocharger 2, and then flows from the turbine rear end 22 of the turbocharger 2 to an exhaust gas primary treatment device, wherein the exhaust gas primary treatment device can be a catalyst 5 and a particulate trap 6 which are connected in sequence.

The waste gas through the tail gas preliminary treatment device flows into and exhaust in the mixing arrangement for the aftertreatment, at this moment to adding urea aqueous solution in the waste gas to gas heating device lets in the hot gas flow to exhaust in the mixing arrangement for the aftertreatment, thereby make the temperature rise and the air current disturbance reinforcing in the mixing arrangement for the aftertreatment of exhausting, thereby make urea aqueous solution and tail gas intensive mixing, can reduce NOx's emission to a certain extent, the waste gas after the processing passes through noise elimination module 7 at last and gets into in the atmosphere.

Example four

Based on the same inventive concept, another embodiment of the present application provides a vehicle, which is characterized in that the vehicle comprises the gas heating device provided in the first embodiment.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or should not be construed as indicating or implying relative importance. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.

The technical solutions provided by the present application are described in detail above, and the principles and embodiments of the present application are described herein by using specific examples, which are only used to help understanding the present application, and the content of the present description should not be construed as limiting the present application. While various modifications of the illustrative embodiments and applications will be apparent to those skilled in the art based upon this disclosure, it is not necessary or necessary to exhaustively enumerate all embodiments, and all obvious variations and modifications can be resorted to, falling within the scope of the disclosure.

Claims

1. The gas heating device is characterized by comprising a gas cavity (11) and a heating part, wherein both ends of the gas cavity (11) are respectively connected with a gas inlet pipe (13) and a gas outlet pipe (14);

the heating part is used for heating the gas in the gas cavity (11);

the gas outlet pipe (14) is used for being connected with an exhaust aftertreatment mixing device so as to input heated gas into the exhaust aftertreatment mixing device.

2. Gas heating device according to claim 1, characterized in that the heating part is provided separately in the gas chamber (11) or on the inlet pipe (13).

3. The gas heating device according to claim 1, wherein the heating part comprises a heat pipe (12), one end of the heat pipe (12) is used for connecting a vortex rear end (22) of the turbocharger (2), and the other end of the heat pipe (12) is connected with the gas cavity (11).

4. Gas heating device according to claim 1, characterized in that a solenoid valve (15) is arranged on the inlet pipe (13), said solenoid valve (15) being used to control the inlet flow rate.

5. Gas heating device according to claim 4, further comprising a monitoring unit (16) and a control unit (17), an output of the monitoring unit (16) being connected to an input of the control unit (17), an output of the control unit (17) being connected to the solenoid valve (15);

the monitoring unit (16) is used for monitoring the current working condition information of the engine;

and the control unit (17) is used for adjusting the opening angle of the electromagnetic valve (15) according to the current working condition information of the engine.

6. A mixing device for exhaust gas aftertreatment, comprising a gas heating device according to any one of claims 1 to 5;

the input end of the mixing device is respectively connected with an air outlet pipe (14) of the gas heating device and an exhaust pipe;

the output end of the mixing device is used for being connected with a selective catalytic reduction device (33).

7. An exhaust gas after treatment system, characterized in that the system comprises a gas heating device according to any one of claims 1-5.

8. Exhaust aftertreatment system according to claim 7, characterized in that the system further comprises a turbocharger (2), the turbocharger (2) comprising a rear end (21), the rear end (21) of the turbocharger (2) being connected with the inlet duct (13) of the gas heating device and the inlet of the engine, respectively.

9. A vehicle, characterized in that the vehicle comprises a gas heating device according to any one of claims 1-5.