CN213039352U

CN213039352U - SCR aftertreatment device

Info

Publication number: CN213039352U
Application number: CN202021240655.3U
Authority: CN
Inventors: 李光瑞; 杨柳
Original assignee: Xiangyang Guangrui Auto Parts Co ltd
Current assignee: Xiangyang Guangrui Auto Parts Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-04-23
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses a SCR post-treatment device, which comprises a cylinder body, wherein both ends of the cylinder body are respectively connected with an air inlet pipe and an exhaust pipe, the outer wall of the air inlet pipe is provided with a conduit, and the conduit extends into the air inlet pipe and is connected with a nozzle; the cylinder is internally provided with a first partition plate and a second partition plate, the first partition plate and the second partition plate divide the inside of the cylinder into a transition chamber, a mixing chamber and a reaction chamber, an air guide pipe is arranged inside the first partition plate and extends into the inside of the mixing chamber, the air guide pipe is positioned on the outer side inside the mixing chamber and is provided with an exhaust hole in a penetrating manner, the surface of the second partition plate is provided with a converging hole in a penetrating manner, and an SCR (selective catalytic reduction) catalyst is arranged inside the reaction chamber. Has the advantages that: the spray head is integrated, so that the distance between the device and the turbine can be reduced, the temperature is prevented from being reduced, and the tail gas treatment effect is ensured; can realize the sufficient contact of urea hydrojet and tail gas, help improving the tail gas treatment effect.

Description

SCR aftertreatment device

Technical Field

The utility model relates to a tail gas processing apparatus technical field, concretely relates to SCR aftertreatment device.

Background

The SCR tail gas aftertreatment aims at effectively controlling the emissions of carbon monoxide (CO), Hydrocarbon (HC), Particles (PM) and the like in the exhaust gas and meeting the requirements of regulations, and finally, the Nitrogen Oxide (NOX) with higher content in the tail gas discharged by an engine is treated by a special vehicle-mounted aftertreatment system. However, the existing SCR exhaust gas post-treatment device does not have a spray nozzle, so that the SCR exhaust gas post-treatment is far away from the turbocharger, the gas temperature is reduced, and the exhaust gas treatment effect is affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a SCR aftertreatment device just lies in providing for solving above-mentioned problem to solve among the prior art present SCR tail gas aftertreatment device and do not have the shower nozzle, cause SCR tail gas aftertreatment and turbo charger distance far away, gas temperature reduces, thereby influences technical problem such as tail gas treatment effect. The preferred technical scheme of the technical schemes provided by the utility model integrates the spray head, which can reduce the distance between the device and the turbine, avoid temperature reduction and ensure the tail gas treatment effect; the urea spraying liquid can be fully contacted with the tail gas, the technical effects of improving the tail gas treatment effect and the like are facilitated, and the details are explained below.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a SCR post-treatment device, which comprises a cylinder body, wherein both ends of the cylinder body are respectively connected with an air inlet pipe and an exhaust pipe, the outer wall of the air inlet pipe is provided with a conduit, and the conduit extends into the air inlet pipe and is connected with a nozzle;

the cylinder is internally provided with a first partition plate and a second partition plate, the first partition plate and the second partition plate divide the cylinder into a transition cavity, a mixing cavity and a reaction cavity, an air guide pipe is arranged inside the first partition plate and extends into the mixing cavity, the air guide pipe is located in an exhaust hole which is formed in the outer side of the mixing cavity in a penetrating mode, a converging hole is formed in the surface of the second partition plate in a penetrating mode and used for communicating the mixing cavity with the reaction cavity, and an SCR (selective catalytic reduction) catalyst is arranged inside the reaction cavity.

When the SCR post-treatment device is used, urea solution is sprayed into the air inlet pipe through the guide pipe and the nozzle, the urea solution enters the transition cavity and the air guide pipe along with tail gas, one part of the tail gas enters the mixing cavity through the outlet end of the air guide pipe, the other part of the tail gas enters the mixing cavity through the exhaust hole, turbulence is formed in the inner part of the mixing cavity, the urea solution is in full contact with the tail gas, the urea is decomposed by utilizing the heat of the tail gas, and the tail gas enters the reaction cavity through the confluence hole, under the auxiliary action of the SCR catalyst, ammonia decomposed from urea and nitrogen oxides in the ammonia are subjected to oxidation-reduction reaction to generate harmless nitrogen and water, and finally the harmless nitrogen and water are discharged from the exhaust pipe, so that the urea spray liquid can be fully contacted with tail gas, and the tail gas treatment effect is improved; the device integration has the shower nozzle can reduce the distance between device and the turbine increase, avoids the temperature reduction, guarantees the tail gas treatment effect.

Preferably, the duct inside the air inlet pipe extends horizontally, and the nozzle corresponds to the air guide pipe.

Preferably, the surface of the first partition board is provided with a diversion hole in a penetrating way.

Preferably, the end part of the diversion hole close to the mixing cavity is in a conical structure, and the diameter of the diversion hole is gradually increased towards the mixing cavity.

Preferably, the flow gathering hole is offset from the air outlet end of the air guide pipe.

Preferably, a silencing cotton is arranged between the SCR catalyst and the exhaust pipe.

Preferably, the inner wall of the cylinder body is provided with heat insulation cotton.

Has the advantages that: 1. the spray head is integrated, so that the distance between the device and the turbine can be reduced, the temperature is prevented from being reduced, and the tail gas treatment effect is ensured;

2. can realize the sufficient contact of urea hydrojet and tail gas, help improving the tail gas treatment effect.

Drawings

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

Fig. 1 is a front view of the present invention;

fig. 2 is an enlarged schematic view of a portion a of fig. 1.

The reference numerals are explained below:

1. a barrel; 101. a transition chamber; 102. a mixing chamber; 103. a reaction chamber; 2. a first separator; 201. a flow guide hole; 3. a nozzle; 4. an air inlet pipe; 5. a conduit; 6. an air guide pipe; 601. an exhaust hole; 7. a second separator; 701. an exhaust port; 8. an SCR catalyst; 9. silent cotton; 10. and (4) exhausting the gas.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the utility model provides an SCR post-treatment device, which comprises a cylinder 1, wherein two ends of the cylinder 1 are respectively connected with an air inlet pipe 4 and an air outlet pipe 10, the outer wall of the air inlet pipe 4 is provided with a conduit 5, and the conduit 5 extends into the air inlet pipe 4 and is connected with a nozzle 3;

barrel 1 is inside to be provided with first baffle 2 and second baffle 7, first baffle 2 and second baffle 7 separate into transition chamber 101 with barrel 1 is inside, mixing chamber 102 and

reaction chamber

103, 2 internally mounted of first baffle has guide duct 6, guide duct 6 stretches into inside mixing chamber 102, guide duct 6 is located the inside outside of mixing chamber 102 and runs through and be provided with exhaust hole 601, second baffle 7 surface runs through and is provided with confluent hole 701, be used for intercommunication mixing chamber 102 and reaction chamber 103, the inside SCR catalyst converter 8 that is provided with of reaction chamber 103.

As an optional embodiment, the pipe 5 is located in the air inlet pipe 4, the pipeline extends horizontally, the nozzle 3 corresponds to the air guide pipe 6, and the urea solution can enter the air guide pipe 6 along with tail gas, so that the urea solution is prevented from crystallizing.

The surface of the first partition board 2 is provided with the diversion hole 201 in a penetrating manner, so that the urea solution which does not enter the air guide pipe 6 can enter the mixing cavity 102 through the diversion hole 201, the crystallization of the urea solution is further reduced, meanwhile, the turbulent flow formed inside the mixing cavity 102 can be promoted, and the mixing effect of the urea solution and the tail gas is improved.

The end part of the diversion hole 201 close to the mixing cavity 102 is of a conical structure, and the diameter of the diversion hole gradually increases towards the mixing cavity 102, so that the resistance of the diversion hole 201 to the tail gas can be reduced, and the tail gas is convenient to enter the mixing cavity 102 through the diversion hole 201.

The exhaust gas flowing through the exhaust hole 701 is guided by the air guiding pipe 6, and the exhaust gas flowing through the exhaust hole 701 is mixed with the urea solution in the mixing chamber 102.

Between the SCR catalyst 8 and the exhaust pipe 10, there is a silencing cotton 9, which reduces noise pollution.

The inner wall of the cylinder body 1 is provided with the heat insulation cotton, so that heat loss can be reduced, and the urea decomposition effect can be improved.

By adopting the structure, when the device is used, urea solution is sprayed into the air inlet pipe 4 through the guide pipe 5 and the nozzle 3, the urea solution enters the transition cavity 101 and the air guide pipe 6 along with tail gas, one part of the tail gas enters the mixing cavity 102 through the outlet end of the air guide pipe 6, the other part of the tail gas enters the mixing cavity 102 through the exhaust hole 601, turbulence is formed in the mixing cavity 102, the urea solution is fully contacted with the tail gas, the urea is decomposed by utilizing the heat of the tail gas, the tail gas enters the reaction cavity 103 through the converging hole 701, and under the auxiliary action of the SCR catalyst 8, the ammonia decomposed by the urea and nitrogen oxides in the tail gas are subjected to oxidation-reduction reaction to generate harmless nitrogen and water and are finally discharged from the exhaust pipe 10, so that the urea spray liquid is fully contacted with the tail gas, and the tail gas; the device integration has the shower nozzle, can reduce the distance between device and the turbine increase, avoids the temperature reduction, guarantees the tail gas treatment effect.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An SCR aftertreatment device, characterized by: the device comprises a cylinder body (1), wherein an air inlet pipe (4) and an air outlet pipe (10) are respectively connected to two ends of the cylinder body (1), a conduit (5) is installed on the outer wall of the air inlet pipe (4), and the conduit (5) extends into the air inlet pipe (4) and is connected with a nozzle (3);

the utility model discloses a mixing device, including barrel (1), first baffle (2) and second baffle (7), first baffle (2) with second baffle (7) will barrel (1) is inside to be separated into transition chamber (101), mixing chamber (102) and reaction chamber (103), first baffle (2) internally mounted has guide duct (6), guide duct (6) stretch into mixing chamber (102) are inside, guide duct (6) are located the inside outside of mixing chamber (102) is run through and is provided with exhaust hole (601), second baffle (7) surface runs through and is provided with confluent hole (701) for the intercommunication mixing chamber (102) with reaction chamber (103), reaction chamber (103) are inside to be provided with SCR catalyst (8).

2. An SCR aftertreatment device according to claim 1 wherein: the pipe (5) is positioned in the air inlet pipe (4), the pipeline extends horizontally, and the nozzle (3) corresponds to the air guide pipe (6).

3. An SCR aftertreatment device according to claim 1 wherein: a diversion hole (201) penetrates through the surface of the first partition plate (2).

4. An SCR aftertreatment device according to claim 3 wherein: the end part of the diversion hole (201) close to the mixing cavity (102) is of a conical structure, and the diameter of the diversion hole is gradually increased towards the direction of the mixing cavity (102).

5. An SCR aftertreatment device according to claim 1 wherein: the confluence hole (701) is deviated from the air outlet end of the air guide pipe (6).

6. An SCR aftertreatment device according to claim 1 wherein: and a silencing cotton (9) is arranged between the SCR catalyst (8) and the exhaust pipe (10).

7. An SCR aftertreatment device according to claim 1 wherein: the inner wall of the cylinder body (1) is provided with heat insulation cotton.