CN210845901U

CN210845901U - Tail gas purification system

Info

Publication number: CN210845901U
Application number: CN201921759460.7U
Authority: CN
Inventors: 刘晓明; 孟艳梅; 冯玉强
Original assignee: Jinan Zhengcheng Automobile Technology Co ltd
Current assignee: Jinan Zhengcheng Automobile Technology Co ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-26
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a tail gas purification system relates to the technical field of car, including tail gas processing apparatus, tail gas processing apparatus is including installing the ammonia nozzle that spouts that sprays liquid ammonia in exhaust duct, it has mixed bars to spout ammonia nozzle intercommunication, mix bars including female pipe, branch pipe, female pipe and spout ammonia nozzle intercommunication, set up a plurality of ammonia spraying holes on the branch pipe, and branch pipe one end and female pipe intercommunication, branch pipe parallel arrangement is in exhaust duct. Spout the female pipe of ammonia mouth in spraying liquid ammonia to mixing grid, liquid ammonia gets into the branch pipe respectively through female pipe, and the liquid ammonia that gets into the branch pipe can pass through a plurality of ammonia spraying holes and distribute in order to with the flue gas misce bene in the pipeline in the exhaust duct to improve flue gas treatment effect.

Description

Tail gas purification system

Technical Field

The utility model belongs to the technical field of the technique of car and specifically relates to a tail gas purification system is related to.

Background

With the development of industry in China, vehicles become main bearing tools for people in daily life, travel and goods operation. However, China also enters a peak of environmental pressure while the industry is rapidly developed and the motor vehicles are greatly increased. As NOx is used as a main constituent of haze, the exhaust emission of motor vehicles is one of the sources, and can cause diseases such as human tracheitis, pneumonia, emphysema and hypoxia, so that the treatment of the vehicle exhaust is urgent, and the treatment, the emission and the monitoring of the vehicle exhaust are more important.

In the prior art, for example, chinese patent publication No. CN109882271A proposes a system for purifying and treating exhaust emission from a diesel engine using liquid ammonia as an SCR reducing agent, which includes a catalytic reactor, the catalytic reactor is communicated with an exhaust pipeline, and an ammonia injection nozzle is installed on the exhaust pipeline, one end of the ammonia injection nozzle is connected to a liquid ammonia steel cylinder, and the other end is communicated with the exhaust pipeline. When the catalytic reactor works, the ammonia injection nozzle injects ammonia gas into the flue gas pipeline, and the ammonia gas is mixed with the flue gas to improve the purification efficiency of the flue gas in the catalytic reactor.

The above prior art solutions have the following drawbacks: the ammonia injection nozzle directly injects liquid ammonia into the exhaust pipeline, so that the liquid ammonia and the flue gas are difficult to be uniformly mixed, and the tail gas purification quality is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tail gas clean system to improve the flue gas misce bene in liquid ammonia and the exhaust duct, improve tail gas clean-up effect.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides a tail gas purification system, includes tail gas processing apparatus, and tail gas processing apparatus is including installing the ammonia nozzle that spouts that sprays liquid ammonia in exhaust duct, it has mixed bars to spout ammonia nozzle intercommunication, mix bars including female pipe, branch pipe, female pipe and spout ammonia nozzle intercommunication, set up a plurality of ammonia spraying hole on the branch pipe, and branch pipe one end and female pipe intercommunication, branch pipe parallel arrangement is in exhaust duct.

Through adopting above-mentioned technical scheme, spout the female pipe that the ammonia mouth sprays liquid ammonia to mixing in the bars, liquid ammonia gets into the branch pipe respectively through female pipe, and the liquid ammonia that gets into the branch pipe can be through a plurality of ammonia holes of spouting distribute in exhaust duct with the flue gas misce bene in the pipeline to improve flue gas purification effect.

The utility model discloses further set up to: the main pipe is arc-shaped, and the side far away from the branch pipe is attached to the inner surface of the exhaust pipeline.

Through adopting above-mentioned technical scheme, circular-arc female pipe can with the exhaust duct laminating for the clearance reduces between mixed female pipe and the exhaust duct, simultaneously, has increased liquid ammonia jet area, has improved the mixed degree of liquid ammonia and flue gas, has further improved catalytic reaction efficiency.

The utility model discloses further set up to: and a plurality of rows of ammonia spraying holes are formed in each branch pipe, the ammonia spraying holes are formed in the side face, facing the smoke inlet direction, of each branch pipe, and the ammonia spraying holes in each row are arranged in a staggered mode.

Through adopting above-mentioned technical scheme, spout the ammonia hole towards into the cigarette direction, increased the mixing time from the atomizing liquid ammonia in spouting the ammonia hole and flue gas on the one hand, improved the mixed degree of atomizing liquid ammonia and flue gas. The ammonia spraying holes are arranged in a staggered mode, so that ammonia spraying is more uniform, and the mixing degree of the ammonia spraying holes and the flue gas is improved.

The utility model discloses further set up to: the ammonia spraying hole is provided with an ammonia spraying small pipe, and the central axis of the ammonia spraying small pipe and the central axis of the exhaust pipeline form an angle of 45 degrees.

Through adopting above-mentioned technical scheme, 45 degrees contained angles easily make and spout ammonia tubule and can produce a convection current with the flue gas when spouting, and the convection current can make atomizing liquid ammonia and flue gas mixture more even.

The utility model discloses further set up to: the small ammonia spraying pipe is arranged in a funnel shape, and a small opening of the small ammonia spraying pipe is connected with the ammonia spraying hole.

Through adopting above-mentioned technical scheme, the small-opening that leaks hopper-shaped can make and mix the interior gas of branch pipe in the bars and pass through and can have great effort, and the big-opening that leaks hopper-shaped can make the liquid ammonia diffusion that sprays out to mix more fully with the flue gas.

The utility model discloses further set up to: and a rectifying device is arranged in the exhaust pipeline behind the mixing grid along the smoke flowing direction, and comprises a first rectifier and a second rectifier which are sequentially arranged along the smoke flowing direction.

Through adopting above-mentioned technical scheme, the second rectifier can be with the further rectification of the flue gas through first arrangement stream ware to make the flue gas after the mixture steadily get into catalytic reactor and react, in order to improve reaction quality.

The utility model discloses further set up to: the first rectifier comprises a plurality of first straight sheets, the side faces of the first straight sheets are arranged in parallel to the axis direction of the exhaust pipeline, and two ends of each first straight sheet are fixedly connected to the inner side wall of the exhaust pipeline.

Through adopting above-mentioned technical scheme, first slice parallel arrangement is in order to reach the purpose that can tentatively rectify the gas mixture.

The utility model discloses further set up to: the second rectifier comprises a plurality of second straight sheets, the second straight sheets are criss-cross to form a grid shape, the side faces of the second straight sheets are parallel to the axial direction of the exhaust pipeline, and two ends of each second straight sheet are fixedly connected to the inner side wall of the exhaust pipeline.

By adopting the technical scheme, the grid-shaped rectifier formed by uniformly arranging the second straight sheets can further rectify the flue gas in the pipeline, so that the mixed gas stably enters the catalytic reactor for reaction.

To sum up, the utility model discloses a beneficial technological effect does:

the mixing grid is arranged, so that liquid ammonia sprayed in the ammonia spraying nozzle can flow into the mother pipe, the liquid ammonia respectively enters the branch pipes through the mother pipe, the liquid ammonia entering the branch pipes can be uniformly distributed in the exhaust pipeline through the ammonia spraying holes, the uniform mixing degree of the liquid ammonia and flue gas in the pipeline is improved, and the tail gas purification effect is improved;

circular-arc female pipe that mixes can laminate with exhaust duct for the clearance between female pipe that mixes and the exhaust duct reduces. Meanwhile, the liquid ammonia injection area is increased, so that the mixing degree of liquid ammonia and flue gas is improved, and the catalytic reaction efficiency is improved.

Drawings

Fig. 1 is a schematic diagram of the structure of the hybrid grid of the present invention.

Fig. 2 is the structural intention of the first layer rectifier of the present invention.

Fig. 3 is a structural view of a second layer rectifier according to the present invention.

Fig. 4 is a schematic layout of the present invention.

Reference numerals: 1. an exhaust duct; 2. an ammonia spraying nozzle; 3. a mixing grid; 4. a main pipe; 5. a branch pipe; 6. an ammonia spraying hole; 7. spraying ammonia small pipes; 8. a first rectifier; 9. a second rectifier; 10. a first straight sheet; 11. a second straight sheet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 4, an exhaust gas purifying system includes an ammonia spray nozzle 2, and a mixing grid 3 installed in an exhaust pipe 1. Mix bars 3 and include female 4 and a plurality of branch pipes 5, 5 one ends of a plurality of branch pipes all communicate with female 4, have seted up a plurality of ammonia injection holes 6 on the branch pipe 5. The middle part of the main pipe 4 is in threaded connection with one end of the ammonia spraying nozzle 2, and the other end of the ammonia spraying nozzle 2 is communicated with the automobile ammonia conveying device. During operation, defeated ammonia device carries liquid ammonia to spouting in the ammonia mouth 2, and liquid ammonia enters mother pipe 4 after spouting ammonia mouth 2, flows into each branch pipe 5 along mother pipe 4, and the ammonia hole 6 that spouts on the branch pipe 5 at last gets into in the flue gas pipeline. The arrangement of the branch pipes 5 improves the mixing area of the ammonia gas and the flue gas entering the smoke exhaust pipeline, so that the flue gas and the ammonia gas are easier to mix. The ammonia spraying holes 6 on each branch pipe 5 are provided with a plurality of rows, the ammonia spraying holes 6 are all arranged on the side face, facing the smoke inlet direction, of the branch pipe 5, and the ammonia spraying holes 6 in each row are arranged in a staggered mode. The ammonia spraying holes 6 are formed in the side face, facing the smoke inlet direction, of the branch pipe 5, the mixing time of ammonia gas and smoke is prolonged, and then the ammonia gas can be mixed with the smoke in the exhaust pipeline 1 more fully. The main pipe 4 is preferably formed in a semicircular arc shape, and the side away from the branch pipe 5 is attached to the inner surface of the exhaust pipe 1. The semi-arc-shaped main pipe 4 can be attached to the side wall of the exhaust pipeline 1, and the gap between the main pipe 4 and the exhaust pipeline 1 is reduced.

Each ammonia spraying hole 6 is communicated with an ammonia spraying small pipe 7, the ammonia spraying small pipe 7 is arranged in a funnel shape, and a funnel-shaped small opening is communicated with the branch pipe 5. The funnel-shaped small opening can enable gas in the branch pipe 5 of the mixing grid 3 to have stronger acting force when passing through, and the funnel-shaped large opening can enable the sprayed liquid ammonia to diffuse, so that the liquid ammonia is mixed with the flue gas more fully. The central axis of the small ammonia injection pipe 7 and the central axis of the exhaust pipeline 1 facing to the flowing direction of the flue gas form an angle of 45 degrees. 45 degrees contained angles easily make and spout ammonia tubule 7 and can produce a convection current with the flue gas when spouting, further make atomizing liquid ammonia and flue gas mixture more even.

Referring to fig. 2 and 3, in order to make the flue gas mixed with the liquid ammonia enter the catalytic reactor uniformly and make the reaction more efficient, a rectifying device is arranged behind the mixing grid 3 inside the exhaust duct 1 along the flow direction of the flue gas. The rectifying device comprises a first rectifier 8 and a second rectifier 9 which are sequentially arranged along the flowing direction of the flue gas. The first rectifier 8 is composed of a plurality of first straight thin sheets 10, the side surfaces of the first straight thin sheets 10 are parallel to the axial direction of the exhaust duct 1, and two ends of the first straight thin sheets 10 are connected to the inner side wall of the exhaust duct 1. The second rectifier 9 is in a grid shape, and the side surfaces of the second straight thin sheets 11 are parallel to the axial direction of the exhaust pipeline 1. The two ends of the second straight thin sheet 11 are connected with the inner side wall of the exhaust duct 1.

The implementation principle of the embodiment is as follows: the flue gas in the exhaust pipeline 1 is mixed with a certain amount of liquid ammonia before entering the catalytic reactor, so that the flue gas can better react with the catalyst. In order to uniformly mix the liquid ammonia and the flue gas which are introduced into the exhaust pipeline 1, the ammonia spraying nozzle 2 is communicated with a mixing grid 3. Liquid ammonia is sprayed out from the ammonia spraying nozzle 2 and then enters the main pipe 4, and the main pipe 4 conveys the liquid ammonia into each branch pipe 5 respectively. The small ammonia spraying pipes 7 communicated with the ammonia spraying holes 6 which are arranged in a staggered mode on the branch pipe 5 are beneficial to dispersing liquid ammonia, and the contact area of atomized liquid ammonia and flue gas is increased, so that the atomized liquid ammonia and the flue gas are uniformly mixed.

In order to ensure that the uniformly mixed flue gas can smoothly enter the catalytic reactor for reaction. The mixed flue gas enters a first rectifier 8 to be primarily rectified, the mixed gas after primary rectification enters a second rectifier 9 to be secondarily rectified, and the mixed gas after the action of the second rectifier 9 can stably enter a catalytic reactor to be reacted.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a tail gas clean-up system, includes tail gas processing apparatus, its characterized in that: tail gas processing apparatus is including installing ammonia nozzle (2) of spouting of injection liquid ammonia in exhaust duct (1), ammonia nozzle (2) intercommunication has mixed bars (3), mix bars (3) including female pipe (4), branch pipe (5), female pipe (4) and ammonia nozzle (2) intercommunication, set up a plurality of ammonia holes (6) that spout on branch pipe (5), and branch pipe (5) one end and female pipe (4) intercommunication, branch pipe (5) parallel arrangement is in exhaust duct (1).

2. An exhaust gas purification system according to claim 1, wherein: the main pipe (4) is arc-shaped, and the side far away from the branch pipe (5) is attached to the inner surface of the exhaust pipeline (1).

3. An exhaust gas purification system according to claim 1, wherein: and a plurality of rows of ammonia spraying holes (6) are formed in each branch pipe (5), the ammonia spraying holes (6) are all arranged on the side face, facing the smoke inlet direction, of each branch pipe (5), and the ammonia spraying holes (6) in each row are arranged in a staggered mode.

4. An exhaust gas purification system according to claim 1, wherein: the ammonia spraying hole (6) is provided with an ammonia spraying small pipe (7), and the central axis of the ammonia spraying small pipe (7) and the central axis of the exhaust pipeline (1) form a 45-degree angle.

5. An exhaust gas purification system according to claim 4, wherein: the small ammonia spraying pipe (7) is arranged in a funnel shape, and a small opening of the small ammonia spraying pipe (7) is connected with the ammonia spraying hole (6).

6. An exhaust gas purification system according to claim 1, wherein: a rectifying device is arranged in the exhaust pipeline (1) behind the mixing grid (3) along the smoke flowing direction, and comprises a first rectifier (8) and a second rectifier (9) which are sequentially arranged along the smoke flowing direction.

7. An exhaust gas purification system according to claim 6, wherein: the first rectifier (8) comprises a plurality of first straight thin sheets (10), the side faces of the first straight thin sheets (10) are arranged in parallel to the axis direction of the exhaust pipeline (1), and two ends of each first straight thin sheet (10) are fixedly connected to the inner side wall of the exhaust pipeline (1).

8. An exhaust gas purification system according to claim 6, wherein: the second rectifier (9) comprises a plurality of second straight thin sheets (11), the second straight thin sheets (11) are criss-cross to form a grid shape, the side surfaces of the second straight thin sheets (11) are parallel to the axial direction of the exhaust pipeline (1), and two ends of each second straight thin sheet (11) are fixedly connected to the inner side wall of the exhaust pipeline (1).