CN217029070U - Tightly-coupled diesel engine exhaust aftertreatment system - Google Patents
Tightly-coupled diesel engine exhaust aftertreatment system Download PDFInfo
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- CN217029070U CN217029070U CN202220470885.1U CN202220470885U CN217029070U CN 217029070 U CN217029070 U CN 217029070U CN 202220470885 U CN202220470885 U CN 202220470885U CN 217029070 U CN217029070 U CN 217029070U
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Abstract
The utility model discloses a tightly-coupled diesel engine exhaust aftertreatment system, belongs to the field of diesel engine aftertreatment devices, and solves the problems that the treatment effect is influenced and the installation is inconvenient due to the fact that the temperature of an exhaust inlet is low when the existing aftertreatment system is under low load. It includes one-level aftertreatment unit, second grade aftertreatment unit and tertiary aftertreatment unit, one-level aftertreatment unit coupling install the exhaust outlet at the diesel engine, one-level aftertreatment unit in encapsulate preceding stage diesel oil oxidation catalyst converter and preceding stage selectivity catalytic converter along the exhaust direction in proper order, second grade aftertreatment unit in encapsulate back stage selectivity catalytic converter and ammonia trapper along the exhaust direction in proper order. The diesel engine exhaust aftertreatment system adopts a three-level system framework, and realizes reasonable installation and efficient matching of the aftertreatment system on the whole vehicle.
Description
Technical Field
The present invention relates to diesel engine aftertreatment devices, and more particularly, it relates to a close-coupled diesel engine exhaust aftertreatment system.
Background
For a diesel engine for a six-emission light vehicle in the conventional state, the technical route generally adopted by aftertreatment comprises the following steps: 1. adopting high-low pressure EGR, and adopting DOC + SCRF + SCR + ASC for an aftertreatment system; 2. high-pressure EGR is adopted, and DOC + SCR + ASC + DPF is adopted as an aftertreatment system. As shown in fig. 1, when the aftertreatment system unit is installed in the entire vehicle layout, the aftertreatment system unit is generally installed on the entire vehicle chassis in an integral package, i.e., in a primary package, and the turbocharger is connected to the aftertreatment through a connection pipe after being swirled, or the diesel oxidation catalyst is installed on the engine in a coupling manner, and the other catalysts are generally installed on the entire vehicle chassis in an encapsulated manner, and the entire vehicle layout with the two aftertreatment packages usually requires a sufficient frame space.
The aftertreatment system with the structure is far away from the engine, the temperature of an exhaust inlet is low during medium and low loads, and the lowest working temperature requirement of a preceding-stage exhaust treatment product can be ensured only by carrying out more effective wrapping and heat preservation on a connecting exhaust pipe. In addition, for light vehicles such as pickup trucks and the like, the single-stage post processor is large in size and long in length, and is difficult to arrange on the chassis, and the main influence is that the ground clearance cannot meet the requirement, or the single-stage post processor interferes with a chassis operating mechanism and other factors.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of the prior art, and aims to provide a tightly-coupled diesel engine exhaust aftertreatment system which adopts a three-level system framework to realize reasonable installation and efficient matching of the aftertreatment system on a whole vehicle.
The technical scheme of the utility model is as follows: the utility model provides a tight coupling's diesel engine exhaust aftertreatment system, includes one-level aftertreatment unit, second grade aftertreatment unit and tertiary aftertreatment unit, one-level aftertreatment unit coupling install the exhaust outlet at the diesel engine, just one-level aftertreatment unit, second grade aftertreatment unit and tertiary aftertreatment unit connect gradually, one-level aftertreatment unit in encapsulate preceding stage diesel oil oxidation catalyst converter and preceding stage selectivity catalytic converter in proper order along the exhaust direction, second grade aftertreatment unit in encapsulate in proper order along the exhaust direction and have succeeding stage selectivity catalytic converter and ammonia catcher, tertiary aftertreatment unit in encapsulate in proper order along the exhaust direction and have succeeding stage diesel oil oxidation catalyst converter and diesel particulate trap.
As a further improvement, the diameters of the outer walls of the secondary post-processing unit and the tertiary post-processing unit are smaller than the diameter of the outer wall of the primary post-processing unit.
Further, one-level aftertreatment unit on be close to the exhaust outlet one end of diesel engine and be equipped with preceding NOx sensor, all be equipped with first temperature sensor on the one-level aftertreatment unit of preceding stage diesel oxidation catalyst converter both sides, be equipped with the blender in the one-level aftertreatment unit between preceding stage diesel oxidation catalyst converter and the preceding stage selectivity catalytic converter, with the one-level aftertreatment unit outer wall that the blender position corresponds is equipped with the urea and sprays the subassembly.
Furthermore, a rear NOx sensor is arranged on the secondary post-processing unit at the rear side of the ammonia gas catcher.
Furthermore, an HC injection device is arranged on a three-stage post-treatment unit on the front side of the rear-stage diesel oxidation catalyst, second temperature sensors are arranged on the three-stage post-treatment units on two sides of the rear-stage diesel oxidation catalyst, a pressure difference sensor is arranged on the three-stage post-treatment unit corresponding to the diesel particle catcher, and a PM sensor is arranged on the three-stage post-treatment unit on the rear side of the diesel particle catcher.
Furthermore, an air inlet pipe is arranged on the side surface of the first-stage aftertreatment unit on the front side of the front-stage diesel oxidation catalyst, and the air inlet pipe is connected with an exhaust outlet of the diesel engine.
Further, a pressure stabilizing cavity is arranged in the first-stage aftertreatment unit at the front side of the front-stage diesel oxidation catalyst, and the pressure stabilizing cavity is communicated with the air inlet pipe.
Furthermore, the inner wall of the air inlet pipe is tangent to the side surface of the inner wall of the pressure stabilizing cavity, and an included angle between the axis line of the air inlet pipe and the top surface of the primary post-processing unit is an acute angle.
Furthermore, the axis line of the air inlet pipe is intersected with the center of the top surface of the inner wall of the pressure stabilizing cavity, and the top surface of the inner wall of the pressure stabilizing cavity is a concave conical surface.
Advantageous effects
Compared with the prior art, the utility model has the following advantages:
1. the post-processing system is divided into three stages of post-processing units, the first stage of post-processing unit is tightly coupled and installed with the light diesel engine, namely, an exhaust inlet of the first stage of post-processing unit is directly coupled with an exhaust outlet of a turbocharger, the first stage of post-processing unit encapsulates a preceding stage diesel oxidation catalyst and a preceding stage selective catalytic converter, the temperature drop of the preceding stage of post-processing unit is ensured to be minimum, the ignition temperature of the diesel engine at low-medium load rotating speed is ensured, and the post-processing system can be quickly and efficiently ignited to enter an efficient interval to work; the secondary post-treatment unit encapsulates a post-selective catalytic converter and an ammonia gas catcher, and the tertiary post-treatment unit encapsulates a post-diesel oxidation catalyst and a diesel particle catcher, so that high-temperature exhaust flow of the diesel engine is treated and then discharged.
2. The post-processing system adopts a three-level system framework, so that the packaging volume of the two-level post-processing unit and the three-level post-processing unit is relatively small, the post-processing system can be flexibly arranged and installed on the chassis of the whole vehicle, various operating mechanisms on the chassis are avoided, the ground clearance of the whole vehicle is ensured, and the reasonable installation and the efficient matching of the post-processing system on the whole vehicle are realized.
3. According to the post-processing system, the pressure stabilizing cavity is arranged in the primary post-processing unit, the angle of the air inlet pipe is further limited, the air outlet of the air inlet pipe is tangent to the air inlet of the pressure stabilizing cavity in the horizontal direction, and the high-temperature air flow is injected to the top surface of the inner wall of the pressure stabilizing cavity in the vertical direction with an included angle, so that high-temperature exhaust of the diesel engine forms turbulent flow in the pressure stabilizing cavity and uniformly passes through the post-processing carrier, the impact of the high-temperature exhaust flow on the post-processing carrier in a direct and concentrated manner is avoided, the impact of the exhaust flow on the post-processing carrier along with the pressure wave change of the working condition of the diesel engine is reduced, and the service life of the primary post-processing unit is effectively prolonged.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic structural diagram of the present invention;
FIG. 3 is a schematic diagram of the structure of the internal package in each level of the unit according to the present invention;
FIG. 4 is an enlarged schematic cross-sectional view of a primary post-processing unit according to the present invention;
FIG. 5 is a schematic front view of the airflow flow within the primary aftertreatment unit of the present invention;
FIG. 6 is a schematic top view of the gas flow within the primary aftertreatment unit of the utility model.
Wherein: 1-first-stage aftertreatment unit, 2-second-stage aftertreatment unit, 3-third-stage aftertreatment unit, 4-diesel engine, 5-front-stage diesel oxidation catalyst, 6-front-stage selective catalytic converter, 7-rear-stage selective catalytic converter, 8-ammonia gas catcher, 9-rear-stage diesel oxidation catalyst, 10-diesel particle catcher, 11-front NOx sensor, 12-first temperature sensor, 13-urea injection component, 14-rear NOx sensor, 15-HC injection device, 16-second temperature sensor, 17-differential pressure sensor, 18-PM sensor, 19-air inlet pipe, 20-pressure stabilizing cavity, 21-mixer, 22-bracket, 23-hoop and 24-exhaust outlet pipe.
Detailed Description
The utility model will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1-6, the utility model relates to a tightly coupled diesel engine exhaust aftertreatment system, comprising a primary aftertreatment unit 1, a secondary aftertreatment unit 2 and a tertiary aftertreatment unit 3, wherein the primary aftertreatment unit 1 is coupled and installed at an exhaust outlet of a diesel engine 4, namely, an exhaust inlet of the primary aftertreatment unit 1 is directly coupled with an exhaust outlet of a turbocharger of the diesel engine 4, the primary aftertreatment unit 1, the secondary aftertreatment unit 2 and the tertiary aftertreatment unit 3 are sequentially connected, concretely, the three are communicated through an air pipe, the air pipe is connected with the three aftertreatment units through flanges, the disassembly and assembly are convenient, the diesel engine exhaust sequentially flows through the primary aftertreatment unit 1, the secondary aftertreatment unit 2 and the tertiary aftertreatment unit 3, a front stage diesel oxidation catalyst 5 and a front stage selective catalytic converter 6 are sequentially packaged in the primary aftertreatment unit 1 along an exhaust direction, the device is used for purifying the front stage of diesel engine exhaust, a rear stage selective catalytic converter 7 and an ammonia gas catcher 8 are sequentially packaged in the second stage aftertreatment unit 2 along the exhaust direction, wherein the rear stage selective catalytic converter 7 is used for purifying the rear stage of gas, the ammonia gas catcher 8 is used for purifying redundant ammonia gas in the gas, a rear stage diesel oxidation catalyst 9 and a diesel particle catcher 10 are sequentially packaged in the third stage aftertreatment unit 3 along the exhaust direction, the rear stage diesel oxidation catalyst 9 is used for purifying the rear stage of gas, and the diesel particle catcher 10 is used for catching and intercepting particles in the gas.
The post-processing system is divided into three stages of post-processing units, wherein the first stage of post-processing unit 1 is tightly coupled with the light diesel engine, and the first stage of post-processing unit 1 encapsulates the preceding stage diesel oxidation catalyst 5 and the preceding stage selective catalytic converter 6, so that the temperature of the preceding stage post-processing unit is reduced to the minimum, the ignition temperature of the diesel engine at the low-load rotating speed is ensured, and the post-processing system can be quickly and efficiently ignited to enter an efficient interval to work; the secondary post-treatment unit 2 encapsulates a post-selective catalytic converter 7 and an ammonia gas catcher 8, and the tertiary post-treatment unit 3 encapsulates a post-diesel oxidation catalyst 9 and a diesel particle catcher 10, so that high-temperature exhaust flow of the diesel engine is treated and then discharged, and the exhaust post-treatment effect is effectively improved.
Preferably, the diameters of the outer walls of the second-stage post-processing unit 2 and the third-stage post-processing unit 3 are smaller than the diameter of the outer wall of the first-stage post-processing unit 1, so that the second-stage post-processing unit 2 and the third-stage post-processing unit 3 can be conveniently mounted on a chassis of the whole vehicle on the premise of ensuring the exhaust post-processing effect. Further, the primary post-processing unit 1 is vertically arranged, the secondary post-processing unit 2 and the tertiary post-processing unit 3 are transversely arranged, and the structural layout of the post-processing system is reasonably optimized.
The post-processing system adopts a three-level system framework, so that the packaging volume of the two-level post-processing unit and the three-level post-processing unit is relatively small, the post-processing system can be flexibly arranged and installed on the chassis of the whole vehicle, various operating mechanisms on the chassis are avoided, the ground clearance of the whole vehicle is ensured, and the reasonable installation and the efficient matching of the post-processing system on the whole vehicle are realized.
Preferably, a front NOx sensor 11 is disposed at one end of the primary aftertreatment unit 1 near the exhaust outlet of the diesel engine 4, and is used for monitoring NOx in the original exhaust of the diesel engine and feeding the NOx back to the ECU, first temperature sensors 12 are disposed at both sides of the primary aftertreatment unit 1 of the primary diesel oxidation catalyst 5, and are used for temperature difference of the primary diesel oxidation catalyst 5, a mixer 21 is disposed in the primary aftertreatment unit 1 between the primary diesel oxidation catalyst 5 and the primary selective catalytic converter 6, a urea injection assembly 13 is disposed on the outer wall of the primary aftertreatment unit 1 corresponding to the mixer 21, and the urea injection assembly 13 generally includes a nozzle and is capable of injecting a urea solution into the mixer 21.
Preferably, a rear NOx sensor 14 is provided on the secondary aftertreatment unit 2 at the rear side of the ammonia trap 8, the rear NOx sensor 14 providing not only a closed loop signal for the selective catalytic reducer but also a signal for an on-board diagnostic system.
Preferably, an HC injection device 15 is arranged on the three-stage post-treatment unit 3 at the front side of the rear-stage diesel oxidation catalyst 9, the HC injection device 15 generally comprises a nozzle and can inject diesel into the three-stage post-treatment unit 3, second temperature sensors 16 are arranged on the three-stage post-treatment units 3 at two sides of the rear-stage diesel oxidation catalyst 9 and are used for temperature difference of the rear-stage diesel oxidation catalyst 9, a pressure difference sensor 17 is arranged on the three-stage post-treatment unit 3 corresponding to the diesel particulate filter 10 and is used for measuring airflow resistance of the diesel particulate filter 10 so as to monitor resistance of the diesel particulate filter 10, and a PM sensor 18 is arranged on the three-stage post-treatment unit 3 at the rear side of the diesel particulate filter 10 and is used for filtering efficiency diagnosis of the diesel particulate filter 10. The various sensors of the present embodiment, as well as the HC injection device 15, the urea injection module 13, various catalysts, and the like, are electrically connected to the ECU.
Preferably, an intake pipe 19 is provided on the side of the primary aftertreatment unit 1 in front of the front stage diesel oxidation catalyst 5, and the intake pipe 19 is connected to an exhaust outlet of the diesel engine 4, specifically, the intake pipe 19 is connected to an exhaust outlet of a turbocharger. Further, a pressure stabilizing cavity 20 is arranged in the first-stage post-treatment unit 1 at the front side of the front-stage diesel oxidation catalyst 5, and the pressure stabilizing cavity 20 is communicated with the air inlet pipe 19. The inner wall of the air inlet pipe 19 is tangent to the side surface of the inner wall of the pressure stabilizing cavity 20, and the included angle between the axis line of the air inlet pipe 19 and the top surface of the primary aftertreatment unit 1 is an acute angle, that is, as shown in fig. 5, a is an acute angle.
According to the post-processing system, the pressure stabilizing cavity 20 is arranged in the primary post-processing unit 1, the angle of the air inlet pipe 19 is further limited, the air outlet of the air inlet pipe 19 is tangent to the air inlet of the pressure stabilizing cavity 20 in the horizontal direction, and high-temperature air flow is sprayed on the top surface of the inner wall of the pressure stabilizing cavity 20 in the vertical direction with an included angle, so that high-temperature exhaust of a diesel engine forms turbulent flow in the pressure stabilizing cavity and uniformly passes through a post-processing carrier, the impact of the high-temperature exhaust flow on the post-processing carrier in a direct and centralized manner is avoided, the impact of the exhaust flow on the post-processing carrier along with the pressure wave change of the working condition of the diesel engine is reduced, and the service life of the primary post-processing unit 1 is effectively prolonged.
Preferably, the axis of the air inlet pipe 19 intersects the center of the top surface of the inner wall of the pressure stabilizing cavity 20, and the top surface of the inner wall of the pressure stabilizing cavity 20 is a concave conical surface, so that high-temperature exhaust can form turbulent flow in the pressure stabilizing cavity 20 more easily, and the impact of airflow on a post-processing carrier is further reduced.
Preferably, a bracket 22 is arranged on one side of the bottom of the primary aftertreatment unit 1, and a hoop 23 is arranged on the upper part of the primary aftertreatment unit 1. This one-level aftertreatment unit 1 passes through bracket 22 and staple bolt 23 and installs on the diesel engine, improves one-level aftertreatment unit 1's stability. Furthermore, an exhaust outlet pipe 24 communicated with the primary aftertreatment unit 1 is arranged at the bottom of the primary aftertreatment unit 1, the exhaust flow after primary treatment flows to the next aftertreatment unit through the exhaust outlet pipe 24, the diameter of the exhaust outlet pipe 24 is smaller than that of the primary aftertreatment unit 1, the time of the exhaust flow in the primary aftertreatment unit 1 is delayed, and the treatment effect is improved.
A method of exhaust aftertreatment of a close-coupled diesel engine, the method comprising the steps of:
step 1: the exhaust gas of the diesel engine flows through a front-stage diesel oxidation catalyst 5 of the primary post-treatment unit 1 in a turbulent manner, and HC, CO and NO in the exhaust gas are subjected to front-stage purification by the front-stage diesel oxidation catalyst 5;
in particular, turbulent exhaust gas is obtained in the primary aftertreatment unit 1 by the angle limitation of the inlet pipe 19 and the structural design of the pressure stabilizing chamber 20, wherein HC and CO in the exhaust gas have a catalytic effect on the oxidation catalystIs oxidized to CO2And H2O, NO in the exhaust gas is oxidized into NO by the catalytic action of the oxidation catalyst2The chemical reaction formula comprises: CO + O2→CO2、HC+O2→CO2+H2O、NO+O2→NO2；
Step 2: mixing the gas purified in the step 1 with NH3Mixing, wherein the mixed gas flows through a front-stage selective catalytic reduction device 6 of the primary post-treatment unit 1, and the front-stage selective catalytic reduction device 6 is used for carrying out front-stage purification on NOx in the mixed gas;
the specific process is that the ECU calculates the required urea injection quantity according to the temperature condition of the preceding selective catalytic reduction device 6, the working condition of the diesel engine and other information, the metering injection pump injects the automobile urea solution into the mixer 21 through the nozzle according to the instruction of the ECU, and the urea solution is decomposed into NH at high temperature3Enters the front stage selective catalytic reduction device 6, and NOx reacts to generate N in the front stage selective catalytic reduction device 62And H2And 0, realizing the purification of NOx, wherein the chemical reaction formula comprises: (NH)2)2CO+H2O→NH3+CO2、NH3+NO+O2→N2+H2O、NH3+NO+NO2→N2+H2O、NH3+NO2→N2+H2O；
And step 3: the gas purified in the step 2 flows through a rear-stage selective catalytic reducer 7 of the secondary post-treatment unit 2, and the rear-stage selective catalytic reducer 7 continuously performs rear-stage purification on NOx in the gas, wherein the specific process of the rear-stage selective catalytic reducer is the same as that of the step 2;
and 4, step 4: the gas purified in the step 3 flows through an ammonia gas catcher 8 of the secondary post-processing unit 2, and the ammonia gas catcher 8 catches redundant NH in the gas3Purifying, using ammonia gas catcher 8 to remove excess NH3Oxidation to N2And H20, having a reaction formula comprising: NH3+O2→N2+H2O；
And 5: the gas purified in the step 4 flows through a rear-stage diesel oxidation catalyst 9 of the three-stage post-treatment unit 3, the rear-stage diesel oxidation catalyst 9 carries out rear-stage purification on HC, CO and NO in the gas, and the specific process is the same as that in the step 1;
step 6: the gas purified in the step 5 flows through a diesel particle catcher 10 of the three-stage post-processing unit 3, and the diesel particle catcher 10 purifies particles in the gas;
wherein, the step 6 also comprises the following specific steps:
step S6.1: carbon particles in the particles intercepted by the diesel particulate trap 10 and NO in the gas2Oxidation reaction is carried out above 250 ℃, thereby oxidizing the soot into CO2Passive regeneration of the diesel particulate trap 10 is achieved;
step S6.2: when the carbon capacity of the diesel particulate filter 10 reaches the regeneration limit value, the resistance of the diesel particulate filter 10 is increased to a set value, the HC injection device 15 injects diesel into the gas at the front side of the rear-stage diesel oxidation catalyst 9, the gas flows through the rear-stage diesel oxidation catalyst 9 to be combusted, the temperature of the diesel particulate filter 10 is raised, and active regeneration is performed, wherein the chemical reaction formula comprises: NO2+C(s)→CO+NO、NO+O2→NO2、CO+O2→CO2、HC+O2→CO2+H2O。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the utility model, which will not affect the effect of the utility model and the practicability of the patent.
Claims (9)
1. A tightly coupled diesel exhaust aftertreatment system is characterized by comprising a primary aftertreatment unit (1), a secondary aftertreatment unit (2) and a tertiary aftertreatment unit (3), the primary post-processing unit (1) is coupled and arranged at the exhaust outlet of the diesel engine (4), and the primary post-processing unit (1), the secondary post-processing unit (2) and the tertiary post-processing unit (3) are connected in sequence, a front-stage diesel oxidation catalyst (5) and a front-stage selective catalytic converter (6) are sequentially packaged in the first-stage aftertreatment unit (1) along the exhaust direction, a post-stage selective catalytic converter (7) and an ammonia gas catcher (8) are sequentially packaged in the secondary post-treatment unit (2) along the exhaust direction, and a rear-stage diesel oxidation catalyst (9) and a diesel particle catcher (10) are sequentially packaged in the three-stage aftertreatment unit (3) along the exhaust direction.
2. The tightly coupled diesel exhaust aftertreatment system of claim 1, wherein the diameters of the outer walls of the secondary aftertreatment unit (2) and the tertiary aftertreatment unit (3) are smaller than the diameter of the outer wall of the primary aftertreatment unit (1).
3. The exhaust aftertreatment system of the tightly coupled diesel engine according to claim 1, wherein a front NOx sensor (11) is disposed at one end of the primary aftertreatment unit (1) close to the exhaust outlet of the diesel engine (4), first temperature sensors (12) are disposed on the primary aftertreatment units (1) at both sides of the front-stage diesel oxidation catalyst (5), a mixer (21) is disposed in the primary aftertreatment unit (1) between the front-stage diesel oxidation catalyst (5) and the front-stage selective catalytic converter (6), and a urea injection assembly (13) is disposed on the outer wall of the primary aftertreatment unit (1) corresponding to the mixer (21).
4. A tightly coupled diesel exhaust aftertreatment system according to claim 1 characterized in that a rear NOx sensor (14) is provided on the secondary aftertreatment unit (2) behind the ammonia trap (8).
5. The exhaust aftertreatment system of the close-coupled diesel engine according to claim 1, wherein an HC injection device (15) is disposed on the three-stage aftertreatment unit (3) in front of the rear-stage diesel oxidation catalyst (9), second temperature sensors (16) are disposed on the three-stage aftertreatment units (3) on two sides of the rear-stage diesel oxidation catalyst (9), a differential pressure sensor (17) is disposed on the three-stage aftertreatment unit (3) corresponding to the diesel particulate filter (10), and a PM sensor (18) is disposed on the three-stage aftertreatment unit (3) behind the diesel particulate filter (10).
6. A tightly coupled diesel exhaust aftertreatment system according to any of the claims 1-5, characterized in that the side of the primary aftertreatment unit (1) in front of the preceding stage diesel oxidation catalyst (5) is provided with an inlet pipe (19), and the inlet pipe (19) is connected with the exhaust outlet of the diesel engine (4).
7. The exhaust aftertreatment system of the tightly coupled diesel engine according to claim 6, characterized in that a pressure stabilizing cavity (20) is arranged in the primary aftertreatment unit (1) at the front side of the front stage diesel oxidation catalyst (5), and the pressure stabilizing cavity (20) is communicated with the air inlet pipe (19).
8. The tightly-coupled diesel engine exhaust aftertreatment system according to claim 7, characterized in that the inner wall of the air inlet pipe (19) is tangent to the side surface of the inner wall of the pressure stabilizing cavity (20), and the included angle between the axis of the air inlet pipe (19) and the top surface of the primary aftertreatment unit (1) is an acute angle.
9. The exhaust aftertreatment system of the tightly coupled diesel engine according to claim 8, characterized in that the axis line of the air inlet pipe (19) intersects with the center of the top surface of the inner wall of the pressure stabilizing cavity (20), and the top surface of the inner wall of the pressure stabilizing cavity (20) is a concave conical surface.
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| CN114575980A (en) * | 2022-03-04 | 2022-06-03 | 广西玉柴机器股份有限公司 | Tightly-coupled diesel engine exhaust aftertreatment system and method |
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