CN114542240B

CN114542240B - Multistage circulation diesel engine tail gas catalytic treatment mechanism

Info

Publication number: CN114542240B
Application number: CN202210151554.6A
Authority: CN
Inventors: 赵振东
Original assignee: Nanjing Institute of Technology
Current assignee: Nanjing Institute of Technology
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2023-06-13
Anticipated expiration: 2042-02-18
Also published as: CN114542240A

Abstract

The invention discloses a multi-stage circulating diesel engine tail gas catalytic treatment mechanism, which relates to the technical field of tail gas treatment, and in particular relates to a multi-stage circulating diesel engine tail gas catalytic treatment mechanism. This multistage circulation diesel engine tail gas catalytic treatment mechanism combines back to the preliminary treatment of tail gas through cotton filter, main oxidation catalyst, inside leading-in secondary processor casing with the tail gas, handles the tail gas once more through the inside secondary oxidation catalyst of snakelike distribution secondary processor casing, increases the time that tail gas and oxidation catalyst contacted, improves the treatment effect to harmful substance in the tail gas.

Description

Multistage circulation diesel engine tail gas catalytic treatment mechanism

Technical Field

The invention relates to the technical field of tail gas treatment, in particular to a multistage circulating diesel engine tail gas catalytic treatment mechanism.

Background

With the rapid development of economy, diesel engines occupy an important place in transportation due to the advantages of wide power coverage, low relative oil consumption, large torque, durability, reliability and the like, but the tail gas of the diesel engines can bring serious environmental pollution due to the structure of the diesel engines and the limitation of diesel oil energy sources thereof. The main components of diesel exhaust pollution are nitrogen oxides, soot particles, HC, sulfur oxides and carbon oxides. Although diesel in-cylinder purification technology and off-board aftertreatment technology have been developed for many years, diesel pollutant emission control technology has long remained a few difficulties.

The existing diesel engine tail gas treatment mechanism has various forms, such as a common DOC diesel oxidation catalyst, and the harmful substances in the tail gas are catalyzed by an oxidation catalyst in the DOC diesel oxidation catalyst to convert carbon monoxide and hydrocarbon into non-toxic and harmless water and carbon dioxide, but the existing diesel oxidation catalyst has smaller size, and the contact time of the tail gas and the oxidation catalyst is shorter, so that the tail gas still contains a large amount of harmful substances after being treated, therefore, the multi-stage circulating diesel engine tail gas catalytic treatment mechanism is provided to solve the problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a multistage circulating diesel engine tail gas catalytic treatment mechanism which has the advantages of improving the tail gas treatment effect and the like and solves the problems in the background art.

In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a multistage circulation diesel engine tail gas catalytic treatment mechanism, includes main processor casing, detachable fixed mounting respectively has the end that admits air, gives vent to anger at the both ends of main processor casing, the inside joint of main processor casing has filter pulp and main oxidation catalyst, the one end fixedly connected with secondary processor casing of main processor casing is kept away from to the end that gives vent to anger, the inside joint of secondary processor casing has the secondary oxidation catalyst, the one end fixedly connected with blast pipe of the end of giving vent to anger is kept away from to the secondary processor casing, and is provided with gas detector, control valve on the blast pipe, the side of blast pipe fixedly communicates has the air duct, and the one end fixedly communicates of air duct has the storage tank that prestores, the inside joint of storage tank has the piston ring, and the side fixedly communicates with connecting pipe, the one end fixedly connected with air pump of connecting pipe, fixedly connected with first muffler, second muffler on the gas outlet of air pump.

Preferably, a positioning ring matched with the main oxidation catalyst and the filter cotton is arranged in the main processor shell, and a metal hollowed-out partition plate matched with the filter cotton is clamped in the main processor shell.

Preferably, the secondary processor shell is distributed on the side surface of the main processor shell in a serpentine shape, and a sealing elbow is detachably and fixedly arranged at the end part of the secondary processor shell.

Preferably, the inside fixed mounting who prestores the storage tank has the spacing ring that is located air duct, connecting pipe top, the spacing ring is located the below of piston ring, the air duct is located between gas detector, the control valve, the inside joint of prestore the storage tank has the compression spring who is located the piston ring top.

Preferably, the connecting pipe is fixedly connected with the air inlet of the air pump, and one end of the second air return pipe on the air outlet of the air pump is fixedly communicated with the air inlet end.

Preferably, the air inlet end and the air outlet end are fixedly connected with the main processor shell through screws, and one ends of the air inlet end and the air outlet end, which are close to the main processor shell, are horn mouths.

The invention provides a multistage circulating diesel engine tail gas catalytic treatment mechanism, which has the following beneficial effects:

1. this multistage circulation diesel engine tail gas catalytic treatment mechanism combines back to the preliminary treatment of tail gas through cotton, main oxidation catalyst, inside leading-in secondary processor casing with the tail gas, handle the tail gas once more through the inside secondary oxidation catalyst of snakelike distribution secondary processor casing, increase the time that tail gas and oxidation catalyst contacted, improve the treatment effect to harmful substance in the tail gas, sealed elbow detachable fixed mounting in the tip of secondary processor casing in addition, when guaranteeing the secondary processor casing and use the leakproofness, be convenient for clear up the change to the secondary oxidation catalyst.

2. This multistage circulation diesel engine tail gas catalytic treatment mechanism detects the tail gas after the processing through gas detector, opens the back control valve and discharges tail gas when the tail gas is qualified, and when the tail gas was unqualified, the suction was carried out to the tail gas through the air pump, and the inside combustion once more of leading into the engine of tail gas part to with the inside reaction of leading into main processor casing and secondary processor casing again of part tail gas, further improve the treatment effect to the tail gas.

Drawings

FIG. 1 is a schematic diagram of the overall assembled structure of the present invention;

FIG. 2 is a schematic diagram of a cross-section of a main processor housing according to the present invention;

FIG. 3 is a schematic diagram of a secondary processor housing according to the present invention;

FIG. 4 is a schematic diagram of a cross-section of a pre-stored tank according to the present invention.

In the figure: 1. a main processor housing; 2. an air inlet end; 3. an air outlet end; 4. a secondary processor housing; 5. sealing the elbow; 6. a secondary oxidation catalyst; 7. an exhaust pipe; 8. a gas detector; 9. a control valve; 10. an air duct; 11. pre-storing a storage tank; 12. piston rings; 13. a compression spring; 14. a connecting pipe; 15. an air pump; 16. a first muffler; 17. a second muffler; 18. filtering cotton; 19. a primary oxidation catalyst; 20. and a metal hollowed-out partition board.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides a multistage circulation diesel engine tail gas catalytic treatment mechanism, including main processor casing 1, main processor casing 1's both ends detachable fixed mounting respectively has inlet end 2, the end 3 of giving vent to anger, main processor casing 1's inside joint has filter pulp 18 and main oxidation catalyst 19, the one end fixedly connected with second grade processor casing 4 of main processor casing 1 is kept away from to the end 3 of giving vent to anger, second grade processor casing 4's inside joint has second grade oxidation catalyst 6, second grade processor casing 4 is kept away from the one end fixedly connected with blast pipe 7 of end 3, and be provided with gas detector 8 on the blast pipe 7, control valve 9, the fixed intercommunication in side of blast pipe 7 has air duct 10, and the one end fixed intercommunication of air duct 10 has prestore storage tank 11, the inside joint of prestore storage tank 11 has piston ring 12, and the fixed intercommunication in side of piston ring 12 has connecting pipe 14, the one end fixedly connected with air pump 15 of connecting pipe 14, fixedly connected with first muffler 16 of air pump 15, second muffler 17 of being connected with after the tail gas is qualified, control valve 9 opens and discharges tail gas, when unqualified, carry out the suction to suck the inside part again with the gas duct 7, and carry out the inside combustion of engine and carry out the inside of the reactor to carry out the inside of the reactor to treat the effect of the inside of the main processor casing again with the main processor casing 4.

The connecting pipe 14 is fixedly connected with the air inlet of the air pump 15, one end of the second muffler 17 on the air outlet of the air pump 15 is fixedly communicated with the air inlet end head 2, the treated tail gas is detected through the gas detector 8, when the tail gas is unqualified, the tail gas is sucked through the air pump 15, part of the tail gas is led into the engine for combustion again, part of the tail gas is led into the main processor shell 1 again for reaction with the inside of the secondary processor shell 4, and the treatment effect of the tail gas is further improved.

The air inlet end 2 and the air outlet end 3 are fixedly connected with the main processor shell 1 through screws, the air inlet end 2 and the air outlet end 3 are convenient to detach, the filter cotton 18 and the main oxidation catalyst 19 inside the main processor shell 1 are convenient to clean and replace, one ends of the air inlet end 2 and the air outlet end 3, which are close to the main processor shell 1, are horn mouths, the air can flow in the air inlet end 2 and the air outlet end 3, and simultaneously, the filter cotton 18 and the main oxidation catalyst 19 can be pressed through the air inlet end 2 and the air outlet end 3, so that the stability of the filter cotton 18 and the main oxidation catalyst 19 after the air inlet end 2 and the air outlet end 3 are installed is ensured.

Referring to fig. 2, a positioning ring matched with a main oxidation catalyst 19 and a filter cotton 18 is arranged in a main processor shell 1, positions of the filter cotton 18 and the main oxidation catalyst 19 are limited by the positioning ring, stability of the main processor is guaranteed during operation, particulate matters in tail gas are filtered in advance by the filter cotton 18, harmful matters are treated by the main oxidation catalyst 19, and treatment effect is improved.

The metal hollow partition board 20 matched with the filter cotton 18 is clamped inside the main processor shell 1, and the filter cotton 18 is softer in texture, so that the position of the filter cotton 18 is limited through the metal hollow partition board 20, the gas flow is ensured, and meanwhile, the stability of the filter cotton 18 is ensured.

Referring to fig. 3, the secondary processor housing 4 is distributed on the side of the main processor housing 1 in a serpentine manner, after the primary treatment of the tail gas by combining the filter cotton 18 and the main oxidation catalyst 19, the tail gas is led into the secondary processor housing 4, and the secondary oxidation catalyst 6 in the secondary processor housing 4 is distributed in a serpentine manner to treat the tail gas again, so that the contact time of the tail gas and the oxidation catalyst is increased, and the treatment effect of harmful substances in the tail gas is improved.

The end part of the secondary processor shell 4 is detachably and fixedly provided with a sealing elbow 5, and the sealing elbow 5 is detachably and fixedly arranged at the end part of the secondary processor shell 4, so that the secondary oxidation catalyst 6 can be cleaned and replaced conveniently while the tightness of the secondary processor shell 4 in use is ensured.

Referring to fig. 4, a limiting ring located above an air duct 10 and a connecting pipe 14 is fixedly installed inside a pre-storing tank 11, the limiting ring is located below a piston ring 12, when tail gas flows back, the tail gas can enter the pre-storing tank 11 to be pre-stored, the air duct 10 is located between a gas detector 8 and a control valve 9, a compression spring 13 located above the piston ring 12 is clamped inside the pre-storing tank 11, and when the tail gas enters the pre-storing tank 11, the tail gas can push the piston ring 12 to move upwards, so that the storage space of the tail gas is increased.

In summary, this multistage circulation diesel engine tail gas catalytic treatment mechanism, when in use, tail gas gets into inside main processor casing 1 along air inlet end 2, filter cotton 18 and main oxidation catalyst 19 through inside main processor casing 1 carry out catalytic treatment to the harmful substance in the tail gas, after preliminary treatment, tail gas along getting into second treater casing 4, carry out the treatment to the harmful substance in the tail gas again through the second oxidation catalyst 6 inside the second treater casing 4, the tail gas after the processing gets into inside blast pipe 7, detect the harmful substance in the tail gas through gas detector 8, when the tail gas is qualified, gas detector 8 control valve 9 opens, discharge the tail gas, when the tail gas is unqualified, draw through air pump 15, follow connecting pipe 14, air duct 10 with tail gas extraction, and follow first muffler 16 and reintroduce partial tail gas into the inside engine and burn, follow second muffler 17 and reintroduce partial tail gas into inside main processor casing 1, the inside of second treater casing 4, the reaction, improvement can.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," "third," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally coupled, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a multistage circulation diesel engine tail gas catalytic treatment mechanism, includes main processor casing (1), its characterized in that: the two ends of the main processor shell (1) are respectively and detachably fixedly provided with an air inlet end (2) and an air outlet end (3), the inside of the main processor shell (1) is clamped with a filter cotton (18) and a main oxidation catalyst (19), one end of the air outlet end (3) away from the main processor shell (1) is fixedly connected with a secondary processor shell (4), the inside of the secondary processor shell (4) is clamped with a secondary oxidation catalyst (6), one end of the secondary processor shell (4) away from the air outlet end (3) is fixedly connected with an exhaust pipe (7), the exhaust pipe (7) is provided with an air detector (8) and a control valve (9), the side face of the exhaust pipe (7) is fixedly communicated with an air duct (10), one end of the air duct (10) is fixedly communicated with a pre-storing storage tank (11), the inside of the storage tank (11) is clamped with a piston ring (12), the side face of the piston ring (12) is fixedly communicated with a pre-storing connecting pipe (14), one end of the connecting pipe (14) is fixedly connected with an air pump (15), and the air outlet (15) is fixedly connected with a first air return pipe (17) and a second air return pipe (17) which are fixedly connected with the air outlet (15).

The gas storage device is characterized in that a limiting ring positioned above a gas guide pipe (10) and a connecting pipe (14) is fixedly arranged in the pre-storage tank (11), the limiting ring is positioned below a piston ring (12), the gas guide pipe (10) is positioned between a gas detector (8) and a control valve (9), and a compression spring (13) positioned above the piston ring (12) is clamped in the pre-storage tank (11);

the connecting pipe (14) is fixedly connected with an air inlet of the air pump (15), and one end of a second air return pipe (17) on an air outlet of the air pump (15) is fixedly communicated with the air inlet end head (2);

part of the exhaust gas is reintroduced into the engine for combustion along a first muffler (16) and part of the exhaust gas is reintroduced into the main processor housing along a second muffler (17).

2. The multi-stage circulating diesel engine exhaust gas catalytic treatment mechanism of claim 1, wherein: the inside of main treater casing (1) is provided with the holding ring that mutually supports with main oxidation catalyst (19), filter pulp (18), the inside joint of main treater casing (1) has metal fretwork baffle (20) mutually supports with filter pulp (18).

3. The multi-stage circulating diesel engine exhaust gas catalytic treatment mechanism of claim 1, wherein: the secondary processor shell (4) is distributed on the side face of the main processor shell (1) in a serpentine shape, and a sealing elbow (5) is detachably and fixedly arranged at the end part of the secondary processor shell (4).

4. The multi-stage circulating diesel engine exhaust gas catalytic treatment mechanism of claim 1, wherein: the air inlet end head (2) and the air outlet end head (3) are fixedly connected with the main processor shell (1) through screws, and one ends of the air inlet end head (2) and the air outlet end head (3) close to the main processor shell (1) are horn mouths.