CN213088100U

CN213088100U - Engine tail gas aftertreatment device

Info

Publication number: CN213088100U
Application number: CN202020417798.0U
Authority: CN
Inventors: 王永东
Original assignee: WUXI POWER ENGINEERING CO LTD
Current assignee: WUXI POWER ENGINEERING CO LTD
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-04-30
Anticipated expiration: 2030-03-27

Abstract

The utility model relates to a tail gas treatment technical field, specifically an engine tail gas aftertreatment device, it can ensure that harmful gas in the tail gas is handled totally, guarantees that the tail gas emission reaches standard, and it includes inlet channel, reaction cavity, the air outlet channel that arranges and communicates in order, be provided with the urea nozzle in the inlet channel, be provided with the carrier unit in the reaction cavity, be provided with the oxynitride sensor in the air outlet channel, its characterized in that, still be provided with temperature sensor and heliciform air current baffle in the inlet channel, still be provided with mixed cavity between inlet channel and the reaction cavity; and the gas homogenizer is positioned at the outlet of the gas inlet channel, and is internally provided with a gas homogenizer which is provided with uniformly distributed holes.

Description

Engine tail gas aftertreatment device

Technical Field

The utility model relates to a tail gas treatment technical field specifically is an engine exhaust aftertreatment device.

Background

GB20891-2014 exhaust emission limit value of diesel engine exhaust pollutants for non-road mobile machinery and a measuring method (the third and fourth stages in China) is about to be implemented, the stricter emission limit value has higher requirements on the content of components of the exhaust gas of the engine, in order to meet the emission limit value of the fourth stage in GB20891-2014 standard, different manufacturers adopt different technical routes to optimize the engine, mainly carry out in-machine optimization and out-machine optimization which are complementary, measures of the in-machine optimization and the out-machine optimization are determined according to the technical routes, the in-machine optimization mainly carries out improvement and optimization on structural parameters of parts of the engine, the out-machine optimization mainly carries out treatment on harmful components in the exhaust gas of the engine, wherein the out-machine optimization is to reasonably set a carrier so that the harmful gas is reacted to generate harmless gas under the action of a catalyst in the carrier, the final exhaust meets the requirements, the current common post-treatment device has a simple structure, the tail gas cannot be well mixed with the carrier, and finally harmful gas is exhausted, so that the emission standard of the tail gas is influenced.

Disclosure of Invention

In order to solve current tail gas treatment insufficient, discharge problem not up to standard, the utility model provides an engine exhaust after treatment device, it can ensure harmful gas in the tail gas and be handled totally, guarantees that tail gas emission is up to standard.

The technical scheme is as follows: an engine tail gas aftertreatment device comprises an air inlet channel, a reaction cavity and an air outlet channel which are sequentially arranged and communicated, wherein a urea nozzle is arranged in the air inlet channel, a carrier unit is arranged in the reaction cavity, and a nitrogen-oxygen sensor is arranged in the air outlet channel; and the gas homogenizer is positioned at the outlet of the gas inlet channel, and is internally provided with a gas homogenizer which is provided with uniformly distributed holes.

The reaction chamber is further characterized in that a supporting partition plate is arranged in the reaction chamber, a fixing hole is formed in the supporting partition plate, and the carrier unit is arranged in the fixing hole;

the gas homogenizer is in a round cover shape, round holes which are uniformly distributed are formed in the end face of the gas homogenizer, and square holes which are uniformly distributed are formed in the circumferential surface of the gas homogenizer;

the gas inlet channel, the mixing cavity, the reaction cavity and the gas outlet channel are of an integrated structure;

the mixing cavity is of a horn mouth structure, a small mouth end of the mixing cavity is connected with the air inlet channel, and a large mouth end of the mixing cavity is connected with the reaction cavity;

the thread-shaped airflow guide plate is composed of at least two spiral sheets which are arranged discontinuously;

an observation hole is formed in the wall of the mixing cavity, and a transparent cover plate is arranged on the wall of the mixing cavity;

the reaction cavity and the air outlet channel are also provided with a rear conical cavity, the air inlet channel and the mixing cavity are of an integral structure, the rear conical cavity and the air outlet channel are of an integral structure, and two ends of the reaction cavity are respectively connected with the mixing cavity and the rear conical cavity through flange surfaces and bolt and nut mechanisms.

Adopt the utility model discloses afterwards, tail gas gets into in the inlet channel, temperature sensor acquires the tail gas temperature and judges injection urea and injection volume, engine exhaust makes the air current heliciform rotatory through heliciform air current baffle with the gas mixture of urea, tail gas and urea intensive mixing, pass through gas homogenizer again and make the gas mixture evenly distributed and relative equivalent's gas mixture pass through the carrier unit in the hybrid chamber, urea reacts with the harmful gas emergence in the tail gas, generate harmless gas, accord with the standard requirement through the gas outlet channel combustion gas at last.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of an intake passage and a mixing chamber according to an embodiment;

FIG. 3 is a schematic structural view of a second embodiment of the present invention;

FIG. 4 is a schematic structural view of an intake passage and a mixing chamber in the second embodiment;

FIG. 5 is a side view of the intake passage;

FIG. 6 is a schematic view of a gas homogenizer;

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a schematic view of a reaction chamber according to an embodiment;

FIG. 9 is a schematic view of a reaction chamber according to the second embodiment;

FIG. 10 is a schematic view of a carrier unit structure;

FIG. 11 is a schematic view of a support baffle structure;

FIG. 12 is a schematic view of an embodiment of a structure of an outlet channel

Detailed Description

The first embodiment is as follows: referring to fig. 1, fig. 2, fig. 5, fig. 6, fig. 7, fig. 8, fig. 10, fig. 11 and fig. 12, the engine exhaust gas post-treatment device comprises an air inlet channel 1, a reaction cavity 2 and an air outlet channel 3 which are sequentially arranged and communicated, wherein a urea nozzle 4, a temperature sensor 5 and a spiral airflow guide plate 6 are arranged in the air inlet channel 1, the urea nozzle and the temperature sensor 5 are both installed through a screw seat, a carrier unit 7 is arranged in the reaction cavity 2, a nitrogen-oxygen sensor 8 is arranged in the air outlet channel 3, and a mixing cavity 9 is also arranged between the air inlet channel 1 and the reaction cavity 2; be located inlet channel 1's exit, be provided with gaseous equalizer 10 in the mixing chamber 9, gaseous equalizer 10 is the dome form, offers the round hole 11 of evenly arranging on the terminal surface of gaseous equalizer 10, offers the square hole 12 of evenly arranging on gaseous equalizer 10 global, makes the gas of going out from gaseous equalizer 10 can with carrier unit homogeneous mixing through even trompil.

Install support baffle 13 in reaction chamber 2, set up four fixed orificess 14 of evenly arranging on the support baffle 13, carrier unit 7 installs in fixed orificess 14, and carrier unit 7 is SCR or SCR and PDF assembly in this embodiment. The mixing cavity 9 is of a bell mouth structure, the small mouth end of the mixing cavity 9 is connected with the air inlet channel 1, and the large mouth end of the mixing cavity is connected with the reaction cavity 2; a rear conical cavity 15 is further arranged between the reaction cavity 2 and the air outlet channel 3, and in the embodiment, the air inlet channel 1, the mixing cavity 9, the reaction cavity 2, the rear conical cavity 15 and the air outlet channel 3 are of an integrated structure.

The thread-shaped airflow guide plate 6 consists of three discontinuously arranged spiral sheets; the wall of the mixing chamber 9 is provided with a viewing aperture 16 and a transparent cover plate 17.

Example two: referring to fig. 3, 4, 5, 6, 7, 9, 10 and 11, the engine exhaust gas post-treatment device comprises an air inlet channel 1, a reaction cavity 2 and an air outlet channel 3 which are sequentially arranged and communicated, wherein a urea nozzle 4, a temperature sensor 5 and a spiral airflow guide plate 6 are arranged in the air inlet channel 1, the urea nozzle and the temperature sensor 5 are both installed through a threaded seat, a carrier unit 7 is arranged in the reaction cavity 2, a nitrogen-oxygen sensor 8 is arranged in the air outlet channel 3, and a mixing cavity 9 is also arranged between the air inlet channel 1 and the reaction cavity 2; be located inlet channel 1's exit, be provided with gaseous equalizer 10 in the mixing chamber 9, gaseous equalizer 10 is the dome form, offers the round hole 11 of evenly arranging on the terminal surface of gaseous equalizer 10, offers the square hole 12 of evenly arranging on gaseous equalizer 10 global, makes the gas of going out from gaseous equalizer 10 can with carrier unit homogeneous mixing through even trompil. The thread-shaped airflow guide plate 6 consists of three discontinuously arranged spiral sheets; the wall of the mixing chamber 9 is provided with a viewing aperture 16 and a transparent cover plate 17.

Install support baffle 13 in reaction chamber 2, set up four fixed orificess 14 of evenly arranging on the support baffle 13, carrier unit 7 installs in fixed orificess 14, and carrier unit 7 is SCR or SCR and PDF assembly in this embodiment. The mixing cavity 9 is of a bell mouth structure, the small mouth end of the mixing cavity 9 is connected with the air inlet channel 1, and the large mouth end of the mixing cavity is connected with the reaction cavity 2; a rear conical cavity 15 is further arranged between the reaction cavity 2 and the air outlet channel 3, in the embodiment, the air inlet channel 1 and the mixing cavity 9 are of an integral structure, the rear conical cavity 15 and the air outlet channel 3 are of an integral structure, and two ends of the reaction cavity 2 are respectively connected with the mixing cavity 9 and the rear conical cavity 15 through flange surfaces and a bolt-nut 18 mechanism. When the carrier unit needs to be maintained or cleaned, the reaction cavity 2 can be detached independently, the operation is convenient, and compared with the structure of the first embodiment, the later maintenance cost can be greatly simplified.

After engine tail gas enters the air inlet channel 1, the temperature sensor 5 obtains the temperature of the tail gas and transmits data to the controller, the controller judges whether urea and the injection quantity are injected through the urea nozzle 4 according to the temperature of the tail gas and the working condition of the engine, the mixed gas of the engine tail gas and the urea reaches the spiral air flow guide plate 6, the air flow can rotate spirally, the tail gas and the urea can be fully mixed, after the air flow reaches the gas homogenizer 10, the mixed gas is uniformly distributed in the mixing cavity 9 through the square holes 12 and the round holes 11 arranged on the gas homogenizer 10, the mixed gas in relative equal quantity passes through each carrier unit 7, the urea and the harmful gas in the tail gas react in the carrier to generate the harmless gas, a part of particulate matters can be captured, and the gas exhausted through the air outlet channel 3 meets the standard requirement. When the device is used for a certain time, the condition of the carrier in the carrier unit 7 is checked through the observation hole 16, or the condition of the carrier is judged through pressure difference, if the carrier unit 7 needs to be clear or replaced, under the condition of the second embodiment, only the bolt and the nut need to be loosened, and the reaction cavity 2 can be separated and replaced.

Claims

1. An engine tail gas aftertreatment device comprises an air inlet channel, a reaction cavity and an air outlet channel which are sequentially arranged and communicated, wherein a urea nozzle is arranged in the air inlet channel, a carrier unit is arranged in the reaction cavity, and a nitrogen-oxygen sensor is arranged in the air outlet channel; and the gas homogenizer is positioned at the outlet of the gas inlet channel, and is internally provided with a gas homogenizer which is provided with uniformly distributed holes.

2. The engine exhaust aftertreatment device according to claim 1, wherein a support partition plate is mounted in the reaction chamber, a fixing hole is formed in the support partition plate, and the carrier unit is mounted in the fixing hole.

3. The engine exhaust aftertreatment device according to claim 1, wherein the gas homogenizer is in a shape of a circular cover, round holes are uniformly arranged on an end face of the gas homogenizer, and square holes are uniformly arranged on a peripheral surface of the gas homogenizer.

4. The engine exhaust aftertreatment device of claim 1, wherein the inlet channel, the mixing cavity, the reaction cavity, and the outlet channel are of an integral structure.

5. The engine exhaust aftertreatment device according to claim 1, wherein the mixing chamber is of a bell mouth structure, a small mouth end of the mixing chamber is connected with the air inlet channel, and a large mouth end of the mixing chamber is connected with the reaction chamber.

6. The engine exhaust aftertreatment device of claim 1, wherein the helical flow guide is formed by at least two intermittently arranged flights.

7. The engine exhaust aftertreatment device of claim 1, wherein a wall of the mixing chamber is perforated with a viewing aperture and fitted with a transparent cover plate.

8. The engine exhaust aftertreatment device according to claim 1, wherein a rear tapered cavity is further disposed between the reaction cavity and the exhaust channel, the intake channel and the mixing cavity are of an integral structure, the rear tapered cavity and the exhaust channel are of an integral structure, and two ends of the reaction cavity are respectively connected to the mixing cavity and the rear tapered cavity through a flange surface and a bolt-nut mechanism.