CN217176734U

CN217176734U - Diesel engine close coupling exhaust aftertreatment and urea double-spraying device thereof

Info

Publication number: CN217176734U
Application number: CN202220182179.7U
Authority: CN
Inventors: 霍帅朋; 陈智; 吴洋平; 沈志荣; 刘小海
Original assignee: Puheim Automotive Technology Shanghai Co ltd
Current assignee: Puheim Automotive Technology Shanghai Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-08-12
Anticipated expiration: 2032-01-24

Abstract

A diesel engine close coupling exhaust aftertreatment and urea double-spraying device thereof comprises a front catalyst assembly and a rear catalyst assembly, wherein the front catalyst assembly comprises a front-stage air inlet cone assembly, an oxidation catalyst, a first mixer, a selective catalytic reduction trap and a front-stage air outlet cone assembly; therefore, the utility model discloses simple structure, convenient operation effectively overcomes prior art's defect, can provide better control mode, improves conversion efficiency, reduces the oxynitrides and discharges, the better requirement that satisfies the regulation.

Description

Diesel engine close coupling exhaust aftertreatment and urea double-spraying device thereof

Technical Field

The utility model relates to the technical field of, especially, relate to a diesel engine close coupling exhaust aftertreatment and two devices that spout of urea thereof.

Background

With the implementation of national VI emission regulations, the emission regulations of fuel vehicles will be further tightened in the future. Future regulations will greatly reduce emission limits for major pollutants in engine exhaust, nitrogen oxides (NOx), etc., with counseling agencies predicting that national VII regulations will be about 50% tightened. Most of the existing conventional schemes are DOC (oxidation catalyst), DPF (particulate trap), mixer, and SCR (selective catalyst reduction) technologies. There is also a scheme of a close-coupled SDPF (selective catalytic reduction trap), in which the front stage is a close-coupled structure composed of a DOC (oxidation catalyst), a mixer and an SDPF (selective catalytic reduction trap), and the rear stage is a mixer, an SCR (selective catalytic reduction) and an ASC (ammonia slip trap).

Although compared with the conventional DOC (oxidation catalyst), DPF (particulate filter), mixer and SCR (selective catalyst reduction) technologies, the existing tightly coupled SDPF (selective catalytic reduction) scheme is beneficial to improving the conversion efficiency of nitrogen oxides (NOx) and reducing the emission of the nitrogen oxides (NOx), the existing tightly coupled SDPF (selective catalytic reduction) scheme is a single-nozzle urea injection control, and if the emission of nitrogen oxides (NOx) is further reduced, the injection amount of urea needs to be increased. However, too much urea injection will exceed the loading capacity of the mixer and cause crystallization, and the back pressure of the system will increase, resulting in increased fuel consumption and increased cost for the vehicle, resulting in a limited capacity of the final device, and thus failing to meet the requirement of lower emission at low cost.

Therefore, in view of the above-mentioned drawbacks, the designer of the present invention has studied and designed a diesel engine close-coupled exhaust aftertreatment device and a urea dual-injection device thereof by means of comprehensive experience and achievement of related industries for many years through careful study and design to overcome the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a diesel engine close coupling exhaust aftertreatment and urea dual spray device thereof, its simple structure, convenient operation effectively overcomes prior art's defect, can provide better control mode, improves conversion efficiency, reduces oxynitride (NOx) and discharges, the better requirement that satisfies the regulation.

In order to achieve the above object, the utility model discloses a diesel engine close coupling exhaust aftertreatment and two devices that spout of urea thereof, including preceding catalyst converter assembly and back catalyst converter assembly, its characterized in that:

the front catalytic converter assembly comprises a front stage air inlet cone assembly, an oxidation catalytic converter, a first mixer, a selective catalytic reduction trap and a front stage air outlet cone assembly, the air inlet end of the oxidation catalytic converter is connected with the front stage air inlet cone assembly, the air outlet end of the oxidation catalytic converter is connected with the upper air inlet of the first mixer, the air inlet end of the selective catalytic reduction trap is connected with the lower air outlet of the first mixer, the air outlet end of the selective catalytic reduction trap is connected with the front stage air outlet cone assembly, the rear catalytic converter assembly comprises a corrugated pipe, a second mixer, a selective catalyst reducer, an ammonia escape trap and a rear stage air outlet cone assembly, the air outlet end of the corrugated pipe is connected with the air inlet of the second mixer, the air inlet end of the selective catalyst reducer is connected with the air outlet of the second mixer, and the air inlet end of the ammonia escape trap is connected with the air outlet end of the selective catalyst reducer, the air inlet end of the rear-stage air outlet cone assembly is connected to the air outlet end of the ammonia escape trap, a first oxynitride sensor mounting seat is arranged on the front-stage air inlet cone assembly, a second oxynitride sensor mounting seat is arranged on the front-stage air outlet cone assembly, and a third oxynitride sensor mounting seat is arranged on the rear-stage air outlet cone assembly.

Wherein: and a first nitrogen oxide sensor is arranged on the first nitrogen oxide sensor mounting seat, a second nitrogen oxide sensor is arranged on the second nitrogen oxide sensor mounting seat, and a third nitrogen oxide sensor is arranged on the third nitrogen oxide sensor mounting seat.

Wherein: the rear end of the preceding stage air outlet cone assembly is connected to the front end of the corrugated pipe through a pipe clamp.

Wherein: the front catalyst assembly further comprises a first nozzle and a first nozzle clamp, and the first nozzle is mounted on the nozzle seat of the first mixer through the first nozzle clamp.

Wherein: the rear catalyst assembly further comprises a second nozzle and a second nozzle clamp, and the second nozzle is mounted on a nozzle seat of the second mixer through the second nozzle clamp.

Wherein: the front stage air inlet cone assembly is tightly coupled with an outlet of a turbocharger of the engine through a V-shaped hoop.

Wherein: the selective catalytic reduction trap is of an integrated structure.

Wherein: the selective catalytic reduction trap includes a selective catalyst reducer disposed at a front end and a particulate trap disposed at a rear end.

According to the structure, the utility model discloses a diesel engine close coupling exhaust aftertreatment and two devices that spout of urea thereof have following effect:

1. simple structure, convenient operation effectively overcomes prior art's defect, can provide better control mode, improves conversion efficiency, reduces oxynitride (NOx) and discharges, better requirement of satisfying the regulation

2. The dual-nozzle combined control strategy is realized, detection can be performed through a first nitrogen oxide (NOx) sensor, a second nitrogen oxide (NOx) sensor and a third NOx sensor, combined control of storage of ammonia (urea) in an SDPF (selective catalytic reduction trap) in a front catalyst assembly and an SCR (selective catalytic reduction) in a rear catalyst assembly is further realized, urea injection quantity of the first nozzle and the second nozzle is optimized, nitrogen oxide (NOx) conversion efficiency at low temperature is greatly improved, and urea crystallization risk is reduced at the same time, so that main pollutant nitrogen oxide (NOx) in engine exhaust is greatly reduced.

The details of the present invention can be obtained from the following description and the attached drawings.

Drawings

Fig. 1 shows the structure schematic diagram of the diesel engine close coupling exhaust after-treatment and urea double-spraying device thereof.

Fig. 2 shows a schematic structural diagram of the front catalyst assembly of the present invention.

Fig. 3 shows a schematic structural diagram of the rear catalyst assembly of the present invention.

Reference numerals:

1. a front catalyst assembly; 2. a rear catalyst assembly; 3. a pipe clamp; 101. a first oxynitride sensor mount; 102. a second nitrous oxide sensor mount; 103. a third oxynitride sensor mount; 1-1, a preceding stage air inlet cone assembly; 1-2, an oxidation catalyst; 1-3, a first nozzle; 1-4, a first nozzle clamp; 1-5, a first mixer; 1-6, a selective catalytic reduction trap; a preceding stage exhaust cone assembly; 2-1 corrugated tubing; 2-2, a second nozzle; 2-3, a second nozzle clamp; 2-4, a second mixer; 2-5, a selective catalyst reducer; 2-6, an ammonia escape trap; 2-7 rear-stage air outlet cone assembly.

Detailed Description

Referring to fig. 1, 2 and 3, the diesel engine close-coupled exhaust aftertreatment and its urea dual spray device of the present invention are shown.

The diesel engine tight coupling exhaust aftertreatment and urea double-spraying device comprises a front catalyst assembly 1 and a rear catalyst assembly 2, wherein the front catalyst assembly 1 and the rear catalyst assembly 2 are connected through a pipe clamp 3, the front catalyst assembly 1 further comprises a front stage air inlet cone assembly 1-1, an oxidation catalyst (DOC)1-2, a first mixer 1-5, a selective catalytic reduction trap (SDPF)1-6 and a front stage air outlet cone assembly 1-7, the air inlet end of the oxidation catalyst 1-2 is connected with the front stage air inlet cone assembly 1-1, the air outlet end of the oxidation catalyst 1-2 is connected with the upper air inlet of the first mixer 1-5, the air inlet end of the selective catalytic reduction trap 1-6 is connected with the lower air outlet of the first mixer, the air outlet end of the selective catalytic reduction trap 1-6 is connected with the front stage air outlet cone assembly 1-7, the rear catalytic converter assembly 2 further comprises a corrugated pipe 2-1, a second mixer 2-4, a Selective Catalyst Reducer (SCR)2-5, an ammonia escape trap (ASC)2-6 and a rear-stage air outlet cone assembly 2-7, wherein the air outlet end of the corrugated pipe 2-1 is connected to the air inlet of the second mixer 2-4, the air inlet end of the selective catalyst reducer 2-5 is connected to the air outlet of the second mixer 2-4, the air inlet end of the ammonia escape trap 2-6 is connected to the air outlet end of the selective catalyst reducer 2-5, the air inlet end of the rear-stage air outlet cone assembly 2-7 is connected to the air outlet end of the ammonia trap 2-6, a first nitrogen oxide (NOx) sensor mounting seat 101 is arranged on the front-stage air inlet cone assembly 1-1, a second nitrogen oxide (NOx) sensor mounting seat 102 is arranged on the front-stage gas outlet cone assembly 1-7, and a third nitrogen oxide (NOx) sensor mounting seat 103 is arranged on the rear-stage gas outlet cone assembly 2-7.

Wherein, the rear end of the preceding stage gas outlet cone assembly 1-7 is connected to the front end of the corrugated pipe 2-1 through a pipe hoop 3.

Wherein the front catalyst assembly 1 further comprises a first nozzle 1-3 and a first nozzle yoke 1-4, and the first nozzle 1-3 is mounted on a nozzle holder of the first mixer 1-5 through the first nozzle yoke 1-4.

Wherein the rear catalyst assembly 2 further comprises a second nozzle 2-2 and a second nozzle yoke 2-3, and the second nozzle 2-2 is mounted on a nozzle holder of the second mixer 2-4 through the second nozzle yoke 2-3.

Among them, a first nitrogen oxide (NOx) sensor is mounted on the first nitrogen oxide (NOx) sensor mount 101, a second nitrogen oxide (NOx) sensor is mounted on the second nitrogen oxide (NOx) sensor mount 102, and a third nitrogen oxide (NOx) sensor is mounted on the third nitrogen oxide (NOx) sensor mount 103.

The front-stage air inlet cone assembly 1-1 is tightly coupled with an outlet of a turbocharger of the engine through a V-shaped hoop.

The selective catalytic reduction traps 1-6 may be an integrated structure or a split structure, and include a Selective Catalyst Reducer (SCR) disposed at a front end and a particle trap (CDPF) disposed at a rear end.

Therefore, through the first, second and third nitrogen oxide sensors arranged in the structure, a double-nozzle combined control strategy can be effectively realized, the measured values of the first, second and third nitrogen oxide sensors are used for carrying out combined control on the storage of ammonia (urea) in SDPF (selective catalytic reduction trap) 1-6 in the front catalyst assembly 1 and SCR (selective catalytic reduction device) 2-5 in the rear catalyst assembly 2, the urea injection amount of the first nozzle 1-3 and the second nozzle 2-2 is optimized, the nitrogen oxide (NOx) conversion efficiency at low temperature is greatly improved, the urea crystallization risk is reduced, and the main pollutant nitrogen oxide (NOx) in the exhaust gas of the engine is greatly reduced.

It is to be understood that the above description and illustrations are exemplary only and are not intended to limit the present disclosure, application, or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention is intended to include any embodiments that fall within the foregoing description and the appended claims.

Claims

1. The utility model provides a diesel engine close coupling exhaust aftertreatment and urea dual spray device thereof, includes preceding catalyst converter assembly and back catalyst converter assembly, its characterized in that:

2. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device thereof of claim 1, wherein: and a first oxynitride sensor is arranged on the first oxynitride sensor mounting seat, a second oxynitride sensor is arranged on the second oxynitride sensor mounting seat, and a third oxynitride sensor is arranged on the third oxynitride sensor mounting seat.

3. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device thereof of claim 1, wherein: the rear end of the preceding stage air outlet cone assembly is connected to the front end of the corrugated pipe through a pipe clamp.

4. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device thereof of claim 1, wherein: the front catalyst assembly further comprises a first nozzle and a first nozzle clamp, and the first nozzle is mounted on the nozzle seat of the first mixer through the first nozzle clamp.

5. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device of claim 1, wherein: the rear catalyst assembly further comprises a second nozzle and a second nozzle clamp, and the second nozzle is mounted on a nozzle seat of the second mixer through the second nozzle clamp.

6. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device of claim 1, wherein: the front stage air inlet cone assembly is tightly coupled with an outlet of a turbocharger of the engine through a V-shaped hoop.

7. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device thereof of claim 1, wherein: the selective catalytic reduction trap is of an integral structure.

8. The diesel engine close-coupled exhaust aftertreatment and urea dual injection device thereof of claim 1, wherein: the selective catalytic reduction trap is of a split structure and comprises a selective catalyst reducer and a particle trap, wherein the selective catalyst reducer is arranged at the front end, and the particle trap is arranged at the rear end.