A high-power diesel engine exhaust after-treatment device

Abstract

The present invention relates to an engine exhaust after-treatment device, and in particular to an exhaust after-treatment device for a high-power diesel engine. The device comprises an intake pipe assembly, a DOC+DPF assembly, an outlet pipe assembly, and a base assembly, wherein the intake pipe assembly, the DOC+DPF assembly, and the outlet pipe assembly are integrally mounted on the base assembly, wherein the DOC+DPF assembly is in a four-parallel mode, wherein the intake pipe assembly has four air pipes respectively connected to four groups of DOC+DPF assemblies, and the two outer air pipes are large-diameter pipelines and the two inner air pipes are small-diameter pipelines. The present invention can effectively relieve the pressure of the engine exhaust pipe, and is conducive to improving the exhaust purification effect, is convenient for maintenance, is easy to install and use, and has high safety and effectiveness.

Description

Technical Field

[0001] The invention relates to an engine exhaust gas post-processing device, in particular to a high-power diesel engine exhaust gas post-processing device. Background Art

[0002] Ballast cleaning and screening machines are large-scale machines used to clean and screen ballast. Existing ballast cleaning and screening machines generally use high-power diesel engines to provide operation and travel power. Due to the lack of exhaust emission purification measures, when cleaning and screening in a closed tunnel environment, harmful gases and substances such as CO, HC, NOx, and particulates in the engine exhaust seriously threaten the life and health of operators. At present, the main exhaust after-treatment technologies adopted by diesel engines include oxidation catalytic converters (DOCs) for removing CO and HC, catalytic reduction devices (SCRs) for removing NOx, and particulate filters (DPFs), among which DOCs and DPFs are generally packaged in the same channel unit for use. However, the existing exhaust after-treatment devices are all used for ordinary diesel engines with low power. For the high-power diesel engines generally used in ballast cleaning and screening machines, since the exhaust emissions are much greater than those of ordinary engines, the existing exhaust after-treatment devices cannot meet the installation requirements. Summary of the invention

[0003] Aiming at the problem of operating environment pollution caused by the lack of exhaust gas post-processing device in the existing screening machine during tunnel line screening operation, the present invention proposes a purification device suitable for harmful emissions such as CO, HC, and particles from high-power engines.

[0004] The present invention is achieved through the following technical solutions:

[0005] A high-power diesel engine exhaust after-treatment device comprises an intake pipe assembly, a DOC+DPF assembly, an outlet pipe assembly and a base assembly. The intake pipe assembly, the DOC+DPF assembly and the outlet pipe assembly are integrally mounted on the base assembly. The DOC+DPF assembly is in a parallel arrangement.

[0006] Preferably, the DOC+DPF components are four in parallel.

[0007] Preferably, the intake pipe assembly has four air pipes respectively connected to four groups of DOC+DPF components, and the two outer air pipes are large-diameter pipes, and the two inner air pipes are small-diameter pipes. The intake pipe assembly also includes a manifold assembly, a valve, a cross pipe bracket, and a bypass exhaust pipe. The manifold assembly is a six-way pipeline structure, and the downward-facing air intake port is provided with a flange for connecting to the engine exhaust pipe; the upward-facing port is the bypass exhaust port, which is connected to the valve through a flange.

[0008] Preferably, it also includes an electronic control device, a pressure sensor and a temperature sensor are installed on the pipeline passage, and the sensor measurement data is sent to the processing unit of the electronic control device through the wiring harness. The electronic control device has a display screen.

[0009] Preferably, the DOC+DPF assembly is formed by connecting a DOC unit and a DPF unit via a clamp, the DPF unit is connected to the exhaust pipe assembly via a clamp, an annular handle is welded to the DPF unit housing, and blocks are welded to the DOC unit housing and the DPF unit housing.

[0010] Preferably, the exhaust pipe assembly consists of an air pipe and a rain cap on the top of the air pipe. The exhaust direction is arranged upward. The movable cover of the rain cap is blown open by the airflow to exhaust when the engine is working, and the movable cover falls under the action of gravity when the engine is not working.

[0011] Preferably, the base assembly includes an integral base and a clamp. The integral base is a steel plate welded structure. The two rows of supporting legs are four concave arc structures on the top. The two rows of supporting legs are connected as a whole through two steel plate seats. Bolt holes are provided at both ends of the steel plate seats.

[0012] The present invention can effectively relieve the pressure of the engine exhaust pipe, is conducive to improving the exhaust gas purification effect, is easy to maintain, is easy to install and use, and has high safety and effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the exhaust gas after-treatment device of the present invention.

[0014] Figure 2 It is an axonometric diagram of the exhaust gas aftertreatment device of the present invention.

[0015] Figure 3 It is an exploded view of the exhaust gas after-treatment device of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1~Figure 3As shown, the exhaust post-treatment device of a high-power diesel engine of the present invention is composed of an intake pipe assembly 1, a DOC+DPF assembly 2, an outlet pipe assembly 3, a base assembly 4, an electronic control device 5, etc. The intake pipe assembly 1, the DOC+DPF assembly 2 and the outlet pipe 3 are connected to form a pipeline passage by welding, clamp connection, etc., and the engine outlet is connected to the intake pipe assembly 1, so that the engine exhaust enters the pipeline passage. After a series of physical and chemical reactions occur in the DOC+DPF assembly 2, harmful gases and substances such as CO, HC, and particles in the exhaust gas are converted into harmless gases or are filtered and removed by the filter element and discharged into the atmosphere. The intake pipe assembly 1, the DOC+DPF assembly 2 and the outlet pipe 3 are installed on the base assembly 4, and the base assembly 4 is provided with bolt mounting holes for installing the post-treatment device on the roof of the vehicle. In order to monitor the gas pressure and temperature parameters in the gas passage, a pressure sensor 5.1 and a temperature sensor 5.2 are installed on the pipeline passage, and the sensor measurement data is sent to the processing unit of the electronic control device 5 through the wiring harness. The electronic control device has a display screen, which can display the temperature and pressure information in time and generate an alarm prompt when the set value is exceeded. The working status of the post-processing device can be monitored in real time, which improves the safety and effectiveness of the post-processing device.

[0018] The intake pipe assembly 1 is composed of a manifold assembly 1.1, a valve 1.2, a cross pipe bracket 1.3, a bypass exhaust pipe 1.4, etc. The manifold assembly 1.1 is a six-way pipeline structure, the downward one is the air inlet, and the port is provided with a flange for connecting with the engine exhaust pipe; the upward one is the bypass exhaust port, which is connected to the valve 1.2 through a flange. The bypass passage is used for temporary exhaust when the DOC+DPF assembly is blocked and alarmed, which can avoid the abnormal shutdown of the engine affecting the operation safety. The main functional components of the DOC+DPF assembly are honeycomb carriers and filter materials, which have the problem of increasing the gas flow resistance. In order to reduce the exhaust back pressure, four groups of DOC+DPF assemblies 2 are connected in parallel. The intake pipe assembly 1 is designed as a one-in-four-out pipeline structure, that is, the four outlets of the intake pipe assembly in the horizontal direction are respectively connected to four groups of DOC+DPF assemblies, so that the pipeline back pressure meets the engine working requirements, which can effectively relieve the engine exhaust pipe pressure and is conducive to improving the exhaust gas purification effect. At the same time, in order to ensure the uniformity of the flow of each set of DOC+DPF components, the two air pipes on the two sides are large-diameter pipes, and the two air pipes on the inside are small-diameter pipes. This makes the filter element replacement cycle more consistent and facilitates maintenance.

[0019] The cross pipe bracket 1.3 is a bolt assembly, which is arranged on both sides of the cross pipe of the intake pipe assembly. The bottom is installed to the roof panel of the vehicle by bolts, and the top is two semicircular structures that surround and fix the cross pipe, which plays a supporting and fixing role for the entire intake pipe assembly including the heavier valve 1.2.

[0020] The DOC+DPF assembly 2 is formed by connecting a DOC unit 2.1 and a DPF unit 2.2 through a clamp 2.3, wherein the DOC unit 2.1 is composed of a DOC carrier, an inner shell, a thermal insulation layer, a DOC outer shell, an air intake reducer, etc., and the DPF unit 2.2 is composed of a DPF filter element, an inner shell, a thermal insulation layer, a DPF outer shell, etc. The DPF unit 2.2 is connected to the outlet pipe assembly 3 through a clamp 2.3. The DPF unit 2.2 is connected to the DOC unit 2.1 by a clamp 2.3. The outer shell of the DPF unit 2.2 is welded with a ring handle, and the DOC carrier and the DPF are easy to replace. The DOC outer shell and the DPF outer shell are welded with a stopper 2.4, which plays a role in longitudinal impact limiting protection for the post-processing device.

[0021] The exhaust pipe assembly 3 is composed of an air pipe 3.1 and a rain cap 3.2. The exhaust direction is arranged upward so that the high-temperature exhaust gas is discharged upward and away from the construction workers under the vehicle. The air pipe 3.1 is welded by a tapered pipe, a straight pipe and a right-angle elbow. The movable cover of the rain cap 3.2 is blown open by the air flow when the engine is working, and the movable cover falls under the action of gravity when the engine is not working, closing the exhaust port, which can effectively prevent rainwater from entering the post-processing device.

[0022] The base assembly 4 includes an integral base 4.1 and a clamp 4.2. The integral base 4.1 is a steel plate welded structure. The two rows of support legs are four concave arc structures on the top. The two rows of support legs are connected as a whole through two steel plate seats. Bolt holes are provided at both ends of the steel plate seats for installation and fixation of the post-processing device and the vehicle roof. Since all the bolt mounting holes are on the outside, the fasteners are easy to install. The blocks 2.4 on the DOC outer shell and the DPF outer shell are both stuck on the outside of the support legs of the integral base 4.1. The clamp 4.2 fixes the DOC unit 2.1 and the DPF unit 2.2 in the concave arc of the base assembly 4, so that the entire pipeline passage including the four sets of DOC+DPF components 2 and the base assembly 4 become a stable whole. Since railway vehicles have height limit restrictions, the low height characteristics of the integral base are conducive to increasing the internal height space of the vehicle.

Claims

1. A high-power diesel engine exhaust after-treatment device, comprising an intake pipe assembly, a DOC+DPF assembly, an outlet pipe assembly, and a base assembly, wherein the intake pipe assembly, the DOC+DPF assembly, and the outlet pipe assembly are integrally mounted on the base assembly, and is characterized in that The DOC+DPF components are connected in parallel in multiple ways; the DOC+DPF components are connected in parallel in four ways; the main functional components of the DOC+DPF components are honeycomb carriers and filter materials, and the air intake pipe component is designed as a one-inlet and four-outlet pipeline structure, that is, the four outlets of the air intake pipe component in the horizontal direction are respectively connected to four groups of DOC+DPF components, so that the pipeline back pressure meets the engine working requirements; The intake pipe assembly has four air pipes connected to four groups of DOC+DPF components respectively, and the two outer air pipes are large-diameter pipes and the two inner air pipes are small-diameter pipes to ensure the uniformity of the flow of each group of DOC+DPF components; the intake pipe assembly also includes a manifold assembly, a valve, a cross pipe bracket, and a bypass exhaust pipe. The manifold assembly is a six-way pipeline structure, and the downward intake port is provided with a flange for connecting to the engine exhaust pipe; the upward bypass exhaust port is connected to the valve through a flange; it also includes an electronic control device, and a pressure sensor and a temperature sensor are installed on the pipeline passage. The sensor measurement data is sent to the processing unit of the electronic control device through a wiring harness, and the electronic control device has a display screen; The DOC+DPF assembly is formed by connecting a DOC unit and a DPF unit through a clamp, the DPF unit is connected to the outlet pipe assembly through a clamp, a ring handle is welded to the DPF unit housing, and a stopper is welded to the DOC unit housing and the DPF unit housing; The exhaust pipe assembly is composed of an air pipe and a rain cap on the top of the air pipe. The exhaust direction is arranged upward. The movable cover of the rain cap is blown open by the air flow to exhaust when the engine is working, and the movable cover falls down under the action of gravity when the engine is not working. The base assembly includes an integral base and a clamp. The integral base is a steel plate welded structure. The two rows of supporting legs are four concave arc structures on the top and are connected as a whole through two steel plate seats. Bolt holes are provided at both ends of the steel plate seats. The blocks on the DOC outer shell and the DPF outer shell are both stuck on the outside of the supporting legs of the integral base. The clamp fixes the DOC unit and the DPF unit in the concave arc of the base assembly, so that the entire pipeline passage including the four sets of DOC+DPF components and the base assembly become a stable whole.

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