CN213540539U

CN213540539U - Common tail gas treatment equipment for gasoline and diesel engines

Info

Publication number: CN213540539U
Application number: CN202022290376.4U
Authority: CN
Inventors: 翁凌云; 翁栋
Original assignee: Hangong Anlije Wuhan Automobile Engineering Co ltd
Current assignee: Hangong Anlije Wuhan Automobile Engineering Co ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-06-25
Anticipated expiration: 2030-10-15

Abstract

The utility model provides a gasoline and diesel engine shared tail gas treatment device, which comprises an engine, an exhaust back pressure valve, a first tail gas treatment pipeline, a second tail gas treatment pipeline, a bypass pipeline and a smoke exhaust fan, wherein the output end of the engine is communicated with the input end of the exhaust back pressure valve, the output end of the exhaust back pressure valve is communicated with the input end of the bypass pipeline, and the output end of the bypass pipeline is communicated with the smoke exhaust fan; the first tail gas treatment pipeline and the second tail gas treatment pipeline are both arranged at two ends of the bypass pipeline in parallel; the first tail gas treatment pipeline, the second tail gas treatment pipeline or the bypass pipeline are selectively opened and are respectively communicated with the engine or the smoke exhaust fan; the first tail gas treatment pipeline or the second tail gas treatment pipeline respectively treats tail gases of engines of different types.

Description

Common tail gas treatment equipment for gasoline and diesel engines

Technical Field

The utility model relates to an automobile engine performance check out test set technical field especially relates to a sharing tail gas treatment facility that is used for behind the test of gasoline and diesel engine performance.

Background

The automobile engine performance test method specifies the test method of dynamic property, economic property and other performance of the automobile engine on a test bench, and relates to various strokes of gasoline engines or diesel engines. The test contents comprise a starting test, an idling test, a power test, a load characteristic test and the like.

In order to carry out harmless treatment on the tail gas after the gasoline and diesel engine test, matched tail gas treatment equipment is required to be adopted, and direct discharge of pollutants is avoided as much as possible. However, the existing institutions such as scientific research institutions, host plants and technical centers are only provided with single tail gas treatment equipment, and during actual use, tail gas components generated by combustion of diesel oil and gasoline are different, so that the tail gas treatment of different types of engines by adopting the single equipment cannot meet actual requirements.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a can realize the integrative shared tail gas treatment device of petrol and diesel engine according to actual engine type.

The technical scheme of the utility model is realized like this: the utility model provides a gasoline and diesel engine sharing tail gas treatment device, including the engine, still include exhaust back pressure valve (1), first tail gas treatment pipeline (2), second tail gas treatment pipeline (3), bypass pipeline (4) and smoke exhaust fan (5), the output of engine and the input of exhaust back pressure valve (1) communicate, the output of exhaust back pressure valve (1) and the input of bypass pipeline (4) communicate, the output of bypass pipeline (4) and smoke exhaust fan (5) communicate;

the input ends of the first tail gas treatment pipeline (2) and the second tail gas treatment pipeline (3) are both connected in parallel at the input end of the bypass pipeline (4), and the output ends of the first tail gas treatment pipeline (2) and the second tail gas treatment pipeline (3) are both connected in parallel at the output end of the bypass pipeline (4); the first tail gas treatment pipeline (2), the second tail gas treatment pipeline (3) or the bypass pipeline (4) are selectively opened and are respectively communicated with an engine or a smoke exhaust fan (5); the first tail gas treatment pipeline (2) or the second tail gas treatment pipeline (3) respectively treat tail gases of engines of different types.

On the basis of the technical scheme, preferably, the bypass pipeline (4) comprises a bypass pipe (41) and a first high-temperature stop valve (42), two ends of the extension direction of the bypass pipe (41) are respectively communicated with the output end of the exhaust back pressure valve (1) and the smoke exhaust fan (5), one end, close to the exhaust back pressure valve (1), of the bypass pipe (41) is provided with the first high-temperature stop valve (42), and the first high-temperature stop valve (42) is connected with the bypass pipe (41) in a sealing mode.

Preferably, the first tail gas treatment pipeline (2) comprises a second high-temperature stop valve (21), a three-way catalyst (22), a GPF unit (23), a first urea nozzle (24) and a first SCR unit (25), wherein the second high-temperature stop valve (21), the three-way catalyst (22), the GPF unit (23) and the first SCR unit (25) are sequentially arranged in a sealing mode and are communicated with one another; the input end of the second high-temperature stop valve (21) is communicated with the input end of the bypass pipeline (4), and the output end of the first SCR unit (25) is communicated with the output end of the bypass pipeline (4); a first urea nozzle (24) is arranged in a sealing manner between the output of the GPF unit (23) and the input of the first SCR unit (25).

More preferably, the second exhaust gas treatment pipeline (3) comprises a third high-temperature stop valve (31), a DOC unit (32), a DPF unit (33), a second urea nozzle (34) and a second SCR unit (35), wherein the third high-temperature stop valve (31), the DOC unit (32), the DPF unit (33) and the second SCR unit (35) are sequentially and hermetically arranged and are communicated with each other; the input end of the third high-temperature stop valve (31) is communicated with the input end of the bypass pipeline (4), and the output end of the second SCR unit (35) is communicated with the output end of the bypass pipeline (4); the second urea nozzle (34) is arranged between the output end of the DPF unit (33) and the input end of the second SCR unit (35) in a sealing mode.

Still further preferably, the system also comprises a plurality of nitrogen oxide sensors (6), a plurality of pressure sensors (7) and a controller (8); the nitrogen oxide sensor (6) is respectively arranged at the input end of the second high-temperature stop valve (21), the output end of the first SCR unit (25), the input end of the third high-temperature stop valve (31) and the output end of the second SCR unit (35); the pressure sensors (7) are respectively arranged at the output end of the GPF unit (23) or the output end of the DPF unit (33), and each nitrogen oxide sensor (6), each pressure sensor (7), the first high-temperature stop valve (42), the second high-temperature stop valve (21), the third high-temperature stop valve (31), the first urea nozzle (24), the second urea nozzle (34) and the engine are electrically connected with the controller (8).

Further preferably, the system also comprises a plurality of temperature sensors (9), wherein the temperature sensors (9) are respectively arranged at the output end of the GPF unit (23), the output end of the DPF unit (33), the output end of the first SCR unit (25) and the output end of the second SCR unit (35); each temperature sensor (9) is electrically connected with the controller (8).

Further preferably, an electric heater is arranged in each of the GPF unit (23) and the DPF unit (33), and the electric heaters are respectively and electrically connected with the controller (8).

Still further preferably, the system further comprises an ammonia gas absorption unit, wherein the ammonia gas absorption unit is respectively arranged at the output end of the first SCR unit (25) and the output end of the second SCR unit (35).

The utility model provides a pair of gasoline and diesel engine sharing tail gas treatment equipment for prior art, has following beneficial effect:

(1) the utility model can open the corresponding first tail gas treatment pipeline or the second tail gas treatment pipeline according to different types of engines, and carry out corresponding harmless treatment on the tail gas discharged by the engine, thereby realizing multiple purposes of one machine and saving the space of equipment; when the engine is abnormal, the bypass pipeline is opened, and the first tail gas treatment pipeline or the second tail gas treatment pipeline is disconnected to protect the engine;

(2) the first tail gas treatment pipeline is used for carrying out targeted treatment on the tail gas of the gasoline engine in a composite mode of a three-way catalyst, a GPF unit and a first SCR unit;

(3) the second tail gas treatment pipeline is used for carrying out targeted treatment on the tail gas of the diesel engine in a composite mode of the DOC unit, the DPF unit and the second SCR unit;

(4) the controller can monitor the content change of nitrogen oxides, the pressure change of the tail gas and the temperature of the tail gas of the first tail gas treatment pipeline or the second tail gas treatment pipeline, so that each functional component is in the optimal working state, and the urea solution sprayed by the first urea nozzle or the second urea nozzle is prevented from being insufficiently evaporated and crystallized;

(5) the electric heater can regenerate the GPF unit or the DPF unit on line or off line, oxidize the adsorbed carbon particles and reduce maintenance procedures.

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 top view of a common exhaust gas treatment device for gasoline and diesel engines according to the present invention;

FIG. 2 is a partially enlarged top view of a first exhaust gas treatment pipeline of the common exhaust gas treatment device for gasoline and diesel engines of the present invention;

FIG. 3 is a partially enlarged top view of a second exhaust gas treatment pipeline of the common exhaust gas treatment device for gasoline and diesel engines of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, the technical solution of the present invention is realized as follows: the utility model provides a gasoline and diesel engine shared tail gas treatment device, which comprises an engine, an exhaust back pressure valve 1, a first tail gas treatment pipeline 2, a second tail gas treatment pipeline 3, a bypass pipeline 4 and a smoke exhaust fan 5, wherein the output end of the engine is communicated with the input end of the exhaust back pressure valve 1, the output end of the exhaust back pressure valve 1 is communicated with the input end of the bypass pipeline 4, and the output end of the bypass pipeline 4 is communicated with the smoke exhaust fan 5;

the input ends of the first tail gas treatment pipeline 2 and the second tail gas treatment pipeline 3 are both connected in parallel at the input end of the bypass pipeline 4, and the output ends of the first tail gas treatment pipeline 2 and the second tail gas treatment pipeline 3 are both connected in parallel at the output end of the bypass pipeline 4; the first tail gas treatment pipeline 2, the second tail gas treatment pipeline 3 or the bypass pipeline 4 are selectively opened and are respectively communicated with an engine or a smoke exhaust fan 5; the first tail gas treatment pipeline 2 or the second tail gas treatment pipeline 3 respectively treat tail gases of engines of different types. During practical use, the corresponding pipeline can be opened as required: when the engine is of the petrol engine type, the first exhaust treatment line 2 is switched on and the second exhaust treatment line 3 and the bypass line 4 are switched off. When the engine is of the diesel type, the second exhaust treatment line 3 is open and the first exhaust treatment line 2 and the bypass line 4 are closed. When the engine has abnormal conditions such as fuel leakage and antifreeze leakage, the bypass pipeline 4 is conducted, the first tail gas treatment pipeline 2 and the second tail gas treatment pipeline 3 are both closed, and the tail gas treatment equipment is protected.

As shown in fig. 1, the bypass line 4 includes a bypass pipe 41 and a first high temperature stop valve 42, two ends of the bypass pipe 41 in the extending direction are respectively communicated with the output end of the exhaust back pressure valve 1 and the smoke exhaust fan 5, the first high temperature stop valve 42 is arranged at one end of the bypass pipe 41 close to the exhaust back pressure valve 1, and the first high temperature stop valve 42 is connected with the bypass pipe 41 in a sealing manner. As can be seen, the opening and closing of the bypass line 4 is effected by a first high-temperature shut-off valve 42 on the bypass line 41.

As shown in fig. 1 in conjunction with fig. 2, a dedicated related device is employed in the treatment of a gasoline type engine. The first tail gas treatment pipeline 2 comprises a second high-temperature stop valve 21, a three-way catalyst 22, a GPF unit 23, a first urea nozzle 24 and a first SCR unit 25, and the second high-temperature stop valve 21, the three-way catalyst 22, the GPF unit 23 and the first SCR unit 25 are sequentially arranged in a sealing mode and are communicated with one another; the input end of the second high-temperature stop valve 21 is communicated with the input end of the bypass pipeline 4, and the output end of the first SCR unit 25 is communicated with the output end of the bypass pipeline 4; a first urea nozzle 24 is sealingly arranged between the output of the GPF unit 23 and the input of the first SCR unit 25. As can be seen from the figure, the combination structure of the three-way catalyst 22, the GPF unit 23 and the first SCR unit 25, the three-way catalyst 22 can partially oxidize carbon monoxide, hydrocarbons and nitrogen oxides, and when the gasoline engine exhaust passes through the three-way catalyst 22, a preliminary oxidation-reduction reaction is performed; then the GPF unit 23 is a honeycomb ceramic filter which can adsorb and capture particulate matters in the tail gas of the gasoline engine; the first SCR unit 25 is combined with the first urea nozzle 24, the first urea nozzle 24 sprays urea solution into the first SCR unit 25, the urea solution is rapidly evaporated and hydrolyzed to form ammonia gas under the influence of the temperature of high-temperature tail gas, the ammonia gas reacts with nitrogen oxides in the tail gas to produce nitrogen gas and water, and the harmless treatment of the tail gas of the gasoline engine is realized through the steps. The three-way catalyst 22 may be formed by covering a honeycomb ceramic surface with a noble metal such as platinum or palladium.

As shown in fig. 1 in conjunction with fig. 3, dedicated associated equipment is also employed in the treatment of diesel type engines. The second exhaust gas treatment pipeline 3 comprises a third high-temperature stop valve 31, a DOC unit 32, a DPF unit 33, a second urea nozzle 34 and a second SCR unit 35, wherein the third high-temperature stop valve 31, the DOC unit 32, the DPF unit 33 and the second SCR unit 35 are sequentially arranged in a sealing manner and are communicated with each other; the input end of the third high-temperature stop valve 31 is communicated with the input end of the bypass pipeline 4, and the output end of the second SCR unit 35 is communicated with the output end of the bypass pipeline 4; a second urea nozzle 34 is sealingly arranged between the output of the DPF unit 33 and the input of a second SCR unit 35. The exhaust gas treatment of the diesel engine employs a combined structure of the DOC unit 32, the DPF unit 33, and the second SCR unit 35. The DOC unit 32 catalyzes the oxidation of the exhaust gas using its catalyst, the DPF unit 33 traps carbon particles in the diesel exhaust gas, and the second SCR unit 35 has a similar principle to the first SCR unit 25.

As shown in fig. 1, in order to better realize automatic pipeline switching and monitor the tail gas treatment effect of the pipeline, the utility model also comprises a plurality of nitrogen oxide sensors 6, a plurality of pressure sensors 7 and a controller 8; the nitrogen oxide sensors 6 are respectively arranged at the input end of the second high-temperature stop valve 21, the output end of the first SCR unit 25, the input end of the third high-temperature stop valve 31 and the output end of the second SCR unit 35; the pressure sensors 7 are respectively arranged at the output end of the GPF unit 23 or the output end of the DPF unit 33, and each nitrogen oxide sensor 6, each pressure sensor 7, the first high-temperature stop valve 42, the second high-temperature stop valve 21, the third high-temperature stop valve 31, the first urea nozzle 24, the second urea nozzle 34 and the engine are electrically connected with the controller 8. The nitrogen oxide sensors 6 at the input end and the output end of the first tail gas treatment pipeline 2 or the second tail gas treatment pipeline 3 can monitor the tail gas purification effect of the pipeline of the console; the pressure sensor 7 may monitor the exhaust back pressure at the output of the GPF unit 23 or DPF unit 33, i.e., whether the GPF unit 23 or DPF unit 33 is clogged, in order to prompt a technician to maintain and regenerate the GPF unit 23 or DPF unit 33. The controller 8 in combination with the engine can automatically open the respective first exhaust treatment line 2 or second exhaust treatment line 3. The controller 8 can be realized by a single chip microcomputer or a PLC.

In order to ensure that the first tail gas treatment pipeline 2 or the second tail gas treatment pipeline 3 is in the best working state, the utility model also comprises a plurality of temperature sensors 9, wherein the temperature sensors 9 are respectively arranged at the output end of the GPF unit 23, the output end of the DPF unit 33, the output end of the first SCR unit 25 and the output end of the second SCR unit 35; each temperature sensor 9 is electrically connected to the controller 8. The GPF unit 23 or the DPF unit 33 are provided therein with electric heaters, and the electric heaters are electrically connected to the controller 8, respectively. When the temperature of the exhaust gas is too low and the GPF unit 23 or the DPF unit 33 needs to be regenerated, the electric heater can electrically heat the GPF unit 23 or the DPF unit 33 to about 550 ℃, so that on one hand, the carbon particles captured by the GPF unit 23 or the DPF unit 33 are burnt to produce carbon dioxide, and the on-line regeneration of the GPF unit 23 or the DPF unit 33 is realized; in addition, when part of the tail gas entering the first SCR unit 25 or the second SCR unit 35 is heated and mixed with the urea solution, the urea solution is more fully evaporated, and the urea solution is prevented from crystallizing in the SCR units.

In addition, in order to prevent the ammonia that first SCR unit 25 or second SCR unit 35 produced from leaking, the utility model discloses still set up the ammonia absorption unit, the ammonia absorption unit sets up the output at first SCR unit 25 and the output of second SCR unit 35 respectively. The ammonia absorption unit can capture and absorb the free ammonia and decompose the free ammonia into nitrogen and water.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a gasoline and diesel engine sharing tail gas treatment equipment, includes the engine, its characterized in that: the system comprises an engine, a first tail gas treatment pipeline (2), a second tail gas treatment pipeline (3), a bypass pipeline (4) and a smoke exhaust fan (5), wherein the output end of the engine is communicated with the input end of the exhaust back pressure valve (1), the output end of the exhaust back pressure valve (1) is communicated with the input end of the bypass pipeline (4), and the output end of the bypass pipeline (4) is communicated with the smoke exhaust fan (5);

2. The common exhaust gas treatment device for gasoline and diesel engines according to claim 1, wherein: bypass pipeline (4), including bypass pipe (41) and first high temperature stop valve (42), the both ends of bypass pipe (41) extending direction communicate with the output and smoke exhaust fan (5) of exhaust back pressure valve (1) respectively, and the one end that is close to exhaust back pressure valve (1) on bypass pipe (41) is provided with first high temperature stop valve (42), first high temperature stop valve (42) and bypass pipe (41) sealing connection.

3. The common exhaust gas treatment device for gasoline and diesel engines according to claim 2, wherein: the first tail gas treatment pipeline (2) comprises a second high-temperature stop valve (21), a three-way catalyst (22), a GPF unit (23), a first urea nozzle (24) and a first SCR unit (25), and the second high-temperature stop valve (21), the three-way catalyst (22), the GPF unit (23) and the first SCR unit (25) are sequentially arranged in a sealing mode and are communicated with one another; the input end of the second high-temperature stop valve (21) is communicated with the input end of the bypass pipeline (4), and the output end of the first SCR unit (25) is communicated with the output end of the bypass pipeline (4); a first urea nozzle (24) is arranged in a sealing manner between the output of the GPF unit (23) and the input of the first SCR unit (25).

4. A gasoline and diesel engine common exhaust gas treatment device according to claim 3, characterized in that: the second tail gas treatment pipeline (3) comprises a third high-temperature stop valve (31), a DOC unit (32), a DPF unit (33), a second urea nozzle (34) and a second SCR unit (35), and the third high-temperature stop valve (31), the DOC unit (32), the DPF unit (33) and the second SCR unit (35) are sequentially arranged in a sealing mode and are communicated with each other; the input end of the third high-temperature stop valve (31) is communicated with the input end of the bypass pipeline (4), and the output end of the second SCR unit (35) is communicated with the output end of the bypass pipeline (4); the second urea nozzle (34) is arranged between the output end of the DPF unit (33) and the input end of the second SCR unit (35) in a sealing mode.

5. The common exhaust gas treatment device for gasoline and diesel engines according to claim 4, wherein: the device also comprises a plurality of nitrogen oxide sensors (6), a plurality of pressure sensors (7) and a controller (8); the nitrogen oxide sensor (6) is respectively arranged at the input end of the second high-temperature stop valve (21), the output end of the first SCR unit (25), the input end of the third high-temperature stop valve (31) and the output end of the second SCR unit (35); the pressure sensors (7) are respectively arranged at the output end of the GPF unit (23) or the output end of the DPF unit (33), and each nitrogen oxide sensor (6), each pressure sensor (7), the first high-temperature stop valve (42), the second high-temperature stop valve (21), the third high-temperature stop valve (31), the first urea nozzle (24), the second urea nozzle (34) and the engine are electrically connected with the controller (8).

6. The common exhaust gas treatment device for gasoline and diesel engines according to claim 5, wherein: the temperature control system is characterized by further comprising a plurality of temperature sensors (9), wherein the temperature sensors (9) are respectively arranged at the output end of the GPF unit (23), the output end of the DPF unit (33), the output end of the first SCR unit (25) and the output end of the second SCR unit (35); each temperature sensor (9) is electrically connected with the controller (8).

7. The common exhaust gas treatment device for gasoline and diesel engines according to claim 5, wherein: and electric heaters are arranged in the GPF unit (23) or the DPF unit (33) and are respectively and electrically connected with the controller (8).

8. The common exhaust gas treatment device for gasoline and diesel engines according to claim 4, wherein: the ammonia absorption unit is arranged at the output end of the first SCR unit (25) and the output end of the second SCR unit (35) respectively.