CN217602751U - S-shaped national six hybrid diesel post-treatment urea mixing structure - Google Patents

Abstract

The utility model relates to an S-shaped national six hybrid diesel post-treatment urea mixing structure, wherein a horn mouth of the structure is connected with the front end of an inner-layer cylinder body, and the horn mouth is connected with a rear-end hump pipe of a particle catcher; the nozzle seat is welded on the inner end cover; the cover plate seals the inner end cover and is connected with the inner-layer cylinder and the connecting pipe; the inner layer cylinder is connected with the inner end cover cavity; the swirl tube is welded on the inner end cover and is opposite to the nozzle holder; the axis of the cyclone tube is superposed with the nozzle hole on the nozzle seat; the cyclone tube is connected with the inner end cover cavity; the connecting pipe is connected with the cover plate and the pipeline hump pipe, supports the rotational flow pipe and the small stainless steel winding net assembly, and is concentrically welded with the rotational flow pipe; the pipeline hump pipe is connected with a front-end mixing pipe of the selective catalytic reduction converter; the stainless steel winding net is placed in the stainless steel pipe and brazed together; the stainless steel winding net is formed by winding cylindrical stainless steel wires layer by layer. The utility model discloses there is apparent effect in the aspect of anti urea crystallization.

Description

S-shaped national six hybrid diesel post-treatment urea mixing structure

Technical Field

The utility model belongs to the technical field of automobile-used engine exhaust emission purification technique and energy saving and consumption reduction, especially relate to a urea mixed structure for aftertreatment.

Background

The technical routes of the current national heavy diesel engine are that an oxidation catalytic unit (DOC)/a particle capture unit (DPF)/a selective catalytic reduction conversion unit (SCR) and an ammonia oxidation catalytic unit (ASC) are combined in series, and most of the national five diesel engines only contain the selective catalytic reduction conversion unit (SCR), so that the national six aftertreatment is more complex than the national five mixed structure and has higher requirement on urea crystallization resistance. In order to meet the requirement of national six post-treatment, the structure which can ensure that urea and automobile exhaust are fully mixed, has obvious effect on the aspect of urea crystallization resistance and solves the problem of urea crystallization in national six post-treatment of the diesel engine needs to be designed.

Disclosure of Invention

The utility model provides a six thoughtlessly move type diesel oil aftertreatment urea mixed structure in S type state, its purpose is solved prior art shortcoming, makes not only can guarantee urea and automobile exhaust intensive mixing, has apparent effect to the aspect of anti urea crystallization moreover.

An S-shaped national six hybrid diesel post-treatment urea mixing structure is characterized in that a bell mouth is connected to the front end of an inner-layer cylinder body, and the bell mouth is connected with a hump pipe at the rear end of a particle trap;

the nozzle seat is welded on the inner end cover;

the cover plate seals the inner end cover and is connected with the inner-layer cylinder and the connecting pipe; the inner-layer cylinder is connected with the inner end cover cavity;

the swirl tube is welded on the inner end cover and is opposite to the nozzle holder; the axis of the cyclone tube is superposed with the nozzle hole on the nozzle seat; the cyclone tube is connected with the inner end cover cavity;

the connecting pipe is connected with the cover plate and the pipeline hump pipe, supports the cyclone pipe and the small stainless steel winding net assembly, and is concentrically welded with the cyclone pipe;

the pipeline hump pipe is connected with a front end mixing pipe of the selective catalytic reduction converter;

the stainless steel winding net small assembly consists of a stainless steel pipe and a stainless steel winding net, and the stainless steel winding net is placed in the stainless steel pipe and connected with the stainless steel pipe by adopting a brazing process; the stainless steel winding net is formed by weaving cylindrical stainless steel wires into wave crest and wave trough shapes and then winding the stainless steel wires layer by layer.

And a heat insulation material layer is filled between the outer end cover and the inner end cover, the nozzle seat penetrates through the outer end cover and is welded on the inner end cover, and the cover plate seals the inner end cover and the outer end cover.

The outer heat insulation barrel body is welded with the inner barrel body, and a heat insulation material layer is filled between the inner wall and the outer wall of the outer heat insulation barrel body and the inner wall of the inner barrel body.

The annular supporting structure is welded on the inner-layer barrel body and supports the barrel body hoop arranged on the outer-layer heat insulation barrel body.

The pressure difference base is arranged on the cover plate, and a pressure difference sensor is arranged on the pressure difference base to read the air pressure at the low-pressure end of the cavity of the inner end cover.

Has the beneficial effects that:

the cyclone tube structure in the structure improves the uniformity of the whole flow field of the tail gas, and urea and the tail gas are fully mixed and uniformly pass through a stainless steel winding net structure; compared with the traditional structure, the stainless steel winding structure can increase the contact area and accelerate high-temperature evaporation hydrolysis; so that the airflow uniformly flows out of the mixed turbulent flow crushing structure; finally, the crystallization resistance of the whole set of post-treatment and the ammonia concentration uniformity at the front end of the catalyst are improved.

Drawings

FIG. 1 is an overall schematic of the intake of a hybrid configuration;

FIG. 2 is an exploded schematic view of a hybrid structure;

FIG. 3 is a schematic internal cross-sectional view of a hybrid structure;

FIG. 4 is a front view of a small assembly of stainless steel wound mesh;

FIG. 5 isbase:Sub>A sectional view taken along line A-A of FIG. 4

Fig. 6 is an exploded perspective view of a stainless steel wound mesh sub-assembly.

[ description of reference ]

In the figure: 10: a bell mouth; 20: an outer layer heat insulation cylinder; 30: an inner layer cylinder; 40: an annular support structure; 50: a nozzle holder; 60: an outer end cover; 70: an inner end cap; 80: a cover plate; 90: a differential pressure mount; 100: a swirl tube; 110: a connecting pipe; 120: a pipeline hump pipe; 130: a small assembly of stainless steel winding net; 131: a stainless steel tube; 132: stainless steel winding net.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained without inventive efforts. To facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, 2, and 3:

the utility model discloses a six thoughtlessly move type diesel oil aftertreatment urea mixed structure in S type state, mixed structure horn mouth and particle trap (DPF) rear end hump pipe cooperation, rear end and selective catalytic reduction converter (SCR) front end hybrid tube are connected.

The mixed structure comprises a bell mouth 10, an outer heat insulation cylinder 20, an inner cylinder 30, an annular supporting structure 40, a nozzle holder 50, an outer end cover 60, an inner end cover 70, a cover plate 80, a differential pressure base 90, a cyclone tube 100, a connecting tube 110, a pipeline hump tube 120 and a small stainless steel winding net assembly 130, wherein the small stainless steel winding net assembly 130 comprises a stainless steel tube 131 and a stainless steel winding net 132.

The bellmouth 10 is connected at the front end of the inner-layer cylinder 30, and the bellmouth 10 is connected with a front end DPF air outlet hump pipe for air inlet.

The outer-layer heat-insulation barrel 20 is of a semicircular structure, two ends of the outer-layer heat-insulation barrel 20 are welded and connected with the inner-layer barrel 30 in sections, an arc-shaped heat-insulation layer is formed between the outer-layer heat-insulation barrel 20 and the inner wall of the inner-layer barrel 30, and a heat-insulation material layer is filled between the outer-layer heat-insulation barrel 20 and the inner-layer barrel 30 and used for heat insulation; the annular supporting structure 40 is welded on the inner-layer cylinder 30 and used for supporting the cylinder hoop installed on the outer-layer heat insulation cylinder 20 and preventing the outer-layer heat insulation cylinder 20 from deforming.

The nozzle holder 50 penetrates through the outer end cover 60 and is welded on the inner end cover 70; the cover plate 80 is used for closing the inner end cover 70 and the outer end cover 60 and connecting the inner-layer cylinder 30 and the connecting pipe 110; and a heat insulation material layer is filled between the outer end cover 60 and the inner end cover 70 for heat insulation. The inner barrel 20 is connected to the inner end cap 70 cavity.

A differential pressure base 90 is mounted on the cover plate 80, and a differential pressure sensor mounted on the differential pressure base 90 reads the air pressure at the low pressure end of the cavity of the inner end cap 70.

The swirl tube 100 is welded to the inner end cap 70 and faces the nozzle holder 50; swirl tube 100 connects the inner end cap 70 cavity. The axis of swirl tube 100 coincides with the nozzle bore in nozzle carrier 50.

And the connecting pipe 110 is used for connecting the small end of the cover plate 80 with the pipeline hump pipe 120 and supporting the cyclone pipe 100 and the small stainless steel winding net assembly 130. The small stainless steel winding net assembly 130 is concentrically welded with the cyclone tube 100, so that the air flow and the urea solution are uniformly mixed and then pass through the stainless steel winding net 132.

And a pipeline hump pipe 120 for connecting a mixing pipe at the front end of a selective catalytic reduction converter (SCR).

As shown in fig. 4, 5, and 6:

the small stainless steel winding net assembly 130 is composed of a stainless steel pipe 131 and a stainless steel winding net 132, and the stainless steel winding net 132 is formed by weaving cylindrical stainless steel wires into wave crest and wave trough shapes and then winding the stainless steel wires layer by layer. The stainless steel winding net 132 is placed inside the stainless steel pipe 131 and is connected to each other using a brazing process.

During the use, tail gas passes through after particulate trap (DPF), through inlayer barrel 30, gets into inner end cover 70 cavity, reentrant whirl blade pipe 100, mixes with the urea solution that sprays from nozzle holder 50 this moment, and tail gas and urea solution misce bene pass through little assembly 130 of stainless steel winding net for the urea atomized liquid is broken, is evaporated, is hydrolysised into the ammonia, makes the crystallization risk littleer.

The utility model discloses utilize the cyclone tube to improve whole flow field homogeneity, through broken, the high temperature evaporation of stainless steel winding net to urea, finally improve a whole set of aftertreatment anti crystallization ability and catalyst front end ammonia concentration homogeneity.

In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The utility model provides a urea mixed structure is handled to S type national six thoughtlessly moving type diesel oil aftertreatment which characterized in that: the horn mouth is connected with the front end of the inner-layer cylinder body and is connected with a hump pipe at the rear end of the particle catcher; the nozzle seat is welded on the inner end cover; the cover plate seals the inner end cover and is connected with the inner-layer cylinder and the connecting pipe; the inner layer cylinder is connected with the inner end cover cavity; the swirl tube is welded on the inner end cover and is opposite to the nozzle seat; the axis of the cyclone tube is superposed with the nozzle hole on the nozzle seat; the cyclone tube is connected with the inner end cover cavity; the connecting pipe is connected with the cover plate and the pipeline hump pipe, supports the cyclone pipe and the small stainless steel winding net assembly, and is concentrically welded with the cyclone pipe; the pipeline hump pipe is connected with a front end mixing pipe of the selective catalytic reduction converter; the stainless steel winding net small assembly consists of a stainless steel pipe and a stainless steel winding net, and the stainless steel winding net is placed in the stainless steel pipe and connected with the stainless steel pipe by adopting a brazing process; the stainless steel winding net is formed by weaving cylindrical stainless steel wires into wave crest and wave trough shapes and then winding the stainless steel wires layer by layer.

2. The type-S hybrid diesel aftertreatment urea mixing structure of claim 1, wherein: and a heat insulation material layer is filled between the outer end cover and the inner end cover, the nozzle seat penetrates through the outer end cover and is welded on the inner end cover, and the cover plate seals the inner end cover and the outer end cover.

3. The type-S hybrid diesel aftertreatment urea mixing structure of claim 1, wherein: the outer layer heat insulation barrel body is welded with the inner layer barrel body, and a heat insulation material layer is filled between the outer layer heat insulation barrel body and the inner wall and the outer wall of the inner layer barrel body.

4. The type-S hybrid diesel aftertreatment urea mixing structure of claim 3, wherein: the annular supporting structure is welded on the inner-layer barrel body and supports the barrel body hoop arranged on the outer-layer heat insulation barrel body.

5. The S-type national six-hybrid diesel aftertreatment urea mixing structure of claim 1, wherein: the pressure difference base is arranged on the cover plate, and the pressure difference base is provided with a pressure difference sensor for reading the air pressure of the low-pressure end of the cavity of the inner end cover.

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