Integrated nano-coating composite regeneration particulate filter for special diesel engine

Abstract

The invention discloses an integrated nano-coating composite regeneration particulate filter for a special diesel engine, and belongs to the technical field of energy conservation and emission reduction, the integrated nano-coating composite regeneration particulate filter comprises an access pipe, a D0C independent oxidation catalytic converter filter body and a DPF particulate filter body, and one end of the access pipe is connected to a detection connecting pipe in a sleeving mode; cordierite is adopted as a filter carrier material, a through-flow type carrier is composed of a D0C independent oxidation catalytic converter cushion layer and a D0C independent oxidation catalytic converter filter body, a wall-flow type filter carrier is composed of a DPF particle trap cushion layer and a DPF particle trap filter body, and the carrier is coated with nanometer precious metal particles. The control complexity of the internal combustion engine emission purification system is reduced, dependence on an external heat source in the regeneration process is reduced, and energy conservation and emission reduction of the internal combustion engine are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conservation and emission reduction, and particularly to an integrated nano-coated composite regenerative particulate trap for a special diesel engine. Background Art

[0002] According to the statistical data of the China Internal Combustion Engine Industry Association, in 2021, the sales volume of internal combustion engines in China was 50.4736 million units, a year-on-year increase of 7.91%, and it is still at the peak of production and sales. Although small-displacement vehicle internal combustion engines have been strongly impacted by new energy power and the growth rate has slowed down, medium and large horsepower internal combustion engines required for heavy trucks, construction machinery, agricultural and forestry machinery, etc. have all achieved double-digit growth, and there is still a large market demand in a certain period. Especially for medium and large horsepower internal combustion engines, it is still difficult to be completely replaced by electric motors at present and still has a long life cycle; Particulates are a major emission pollutant of internal combustion engines and pose a great harm to the atmospheric environment and human health. In order to effectively reduce the environmental pollution caused by internal combustion engine emissions, on the basis of the current implementation of the "National VI a" emission standard for motor vehicles in China, the "National VI b" emission standard for motor vehicles will be implemented on July 1, 2023, and the "National IV" emission standard for non-road mobile machinery such as construction machinery and agricultural and forestry machinery will be implemented on December 1, 2022, further strictening the emission requirements for internal combustion engines;

[0003] A particulate trap is a recognized and most effective post-treatment purification device for controlling particulate emissions of internal combustion engines and has been widely used; After the particulate trap works for a period of time, it is necessary to oxidize and remove the trapped particulates through an oxidation reaction, otherwise it will cause excessive back pressure in the internal combustion engine, reduce the performance of the internal combustion engine, increase fuel consumption, and even damage the internal combustion engine in severe cases; The process of oxidizing and removing particulates by the particulate trap is called the regeneration process, and its principle is that O2 in the exhaust gas reacts with the particulates (the main component is carbon) to generate CO2. The oxidation temperature of the traditional particulate trap regeneration process reaches 550°C - 600°C. At present, external heat source heating methods such as microwave heating, fuel injection for combustion assistance, and electric heating are mainly used for regeneration. Using an external heat source increases the cost of the internal combustion engine emission purification device on the one hand and increases the energy consumption of the internal combustion engine system on the other hand, which is not conducive to the energy conservation and emission reduction of the internal combustion engine; After the implementation of the new emission standard, due to the increasingly strict requirements for particulate emissions in the exhaust gas of internal combustion engines, the regeneration times of traditional particulate traps will be more frequent, the regeneration energy consumption will increase, and the complexity of the control system will increase, which will further increase the energy consumption and cost of the internal combustion engine; In order to balance the low emissions and fuel economy of the internal combustion engine, it is necessary to design an integrated nano-coated composite regenerative particulate trap to adopt a new particulate trap regeneration method, reduce the control complexity of the internal combustion engine emission purification system, reduce the dependence on external heat sources during the regeneration process, and achieve the energy conservation and emission reduction of the internal combustion engine. Summary of the Invention

[0004] The present invention aims to provide an integrated nano - coated composite regenerative particulate trap for special diesel engines to solve the problems presented in the above - mentioned background technology.

[0005] To achieve the above - mentioned purpose, the present invention provides the following technical solutions:

[0006] An integrated nano - coated composite regenerative particulate trap for special diesel engines, comprising an access pipe, a DPF particulate trap housing assembly, an exhaust pipe, a detection connection pipe, a D0C independent oxidation catalytic converter cushion layer, a D0C independent oxidation catalytic converter filter body, a DPF particulate trap cushion layer, a DPF particulate trap filter body, and an external detection assembly;

[0007] The DPF particulate trap housing assembly consists of a first connection section, an expansion pipe, a second connection section, a first housing, and a second housing, and the expansion angle of the expansion pipe is 90°;

[0008] The second connection section is sleeved on the second housing, and the exhaust pipe is sleeved on the second connection section;

[0009] The external detection assembly consists of an external joint, an outflow hole, a sealing ring, a rotating pipe, a docking hole, a docking pipe, a support block, a plugging block, a return spring, and a pressing member; the outflow holes in the external detection assembly are uniformly opened on the side wall of the detection connection pipe;

[0010] One end of the access pipe is sleeved on the detection connection pipe, one end of the detection connection pipe is sleeved on the first connection section in the DPF particulate trap housing assembly, the first connection section is sleeved on the first housing, the first housing is provided with an expansion pipe, the expansion pipe is sleeved on the second housing, the inner wall of the first housing is provided with a D0C independent oxidation catalytic converter cushion layer, the D0C independent oxidation catalytic converter filter body is arranged in the D0C independent oxidation catalytic converter cushion layer, the inner wall of the second housing is provided with a DPF particulate trap cushion layer, and the DPF particulate trap filter body is arranged in the DPF particulate trap cushion layer;

[0011] The sealing ring is sleeved in the outflow hole and tightly presses on the inner wall of the rotating pipe, and the rotating pipe is rotatably connected to the detection connection pipe;

[0012] The rotating pipe is uniformly provided with docking holes, the docking pipes are sleeved in the docking holes, and one end of the docking pipe is threadedly connected with an external joint;

[0013] A support block is fixedly sleeved in the docking pipe, a plugging block is sleeved in the wedge - shaped hole opened in the support block, one end of the plugging block is provided with a return spring and a pressing member, the return spring is located between the pressing members, and one end of the return spring is fixed on the inner wall of the docking pipe.

[0014] The DOC part of the DOC standalone oxidation catalytic converter cushion and the DOC standalone oxidation catalytic converter filter element adopts a flow-through carrier, and the DPF part of the DPF particulate trap cushion and the DPF particulate trap filter element adopts a wall-flow filter carrier. The DOC part has a diameter smaller than that of the DPF part. The two sections of carriers are connected by an expansion pipe and integrally encapsulated to form an overall encapsulated form.

[0015] 2. The integrated nano-coated composite regeneration particulate trap for a special diesel engine according to claim 1, wherein: the main materials of the DOC standalone oxidation catalytic converter cushion, the DOC standalone oxidation catalytic converter filter element, the DPF particulate trap cushion, and the DPF particulate trap filter element are cordierite.

[0016] 3. The integrated nano-coated composite regeneration particulate trap for a special diesel engine according to claim 1, wherein: the outer surfaces of the DOC standalone oxidation catalytic converter cushion, the DOC standalone oxidation catalytic converter filter element, the DPF particulate trap cushion, and the DPF particulate trap filter element are all coated with nano-precious metal Pt particles.

[0017] 4. The integrated nano-coated composite regeneration particulate trap for a special diesel engine according to claim 1, wherein: the pore density of the DOC standalone oxidation catalytic converter filter element is 400 mesh, and the pore width is 1.095 mm.

[0018] 5. The integrated nano-coated composite regeneration particulate trap for a special diesel engine according to claim 1, wherein: the porosity density of the DPF particulate trap filter element is 100 mesh, and the pore width is 2.374 mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention uses cordierite as the filter carrier material, and consists of a DOC (Diesel Oxidation Catalyst) independent oxidation catalytic converter cushion layer and a DOC independent oxidation catalytic converter filter body to form the DOC part with a flow-through carrier, and the carrier is coated with nano-precious metal particles. The DOC pore density is 400 mesh, and the pore channel width is 1.095 mm. At the same time, it consists of a DPF (Diesel Particulate Filter) particulate trap cushion layer and a DPF particulate trap filter body to form the DPF part with a wall-flow filter carrier, and the carrier is also coated with nano-precious metal particles. A cerium-based additive is added to the fuel. The pore density of the DPF is 100 mesh, and the pore channel width is 2.374 mm. The DOC carrier diameter is smaller than the DPF carrier diameter. An expansion tube with an expansion angle of 90° is used to connect the two sections of the carrier, and integrated packaging is carried out to form an overall packaging form. Coating with nano-precious metal particles increases the specific surface area of the catalytic coating, making the particulates contact the precious metal catalyst more fully. At the same time, through the catalytic action of the precious metal and the oxygen storage and release function of the cerium-based additive, NO2 is recycled during the regeneration process, realizing the composite regeneration of particulates at the exhaust temperature of the internal combustion engine; the expansion tube with an expansion angle of 90° enables the air flow to expand fully and slow down the flow rate between the DOC and the DPF, so that the air flow after DOC catalytic oxidation enters the DPF at an appropriate flow rate, making the exhaust flow field suitable for the DPF to trap and oxidize particulates; reducing the control complexity of the internal combustion engine emission purification system, reducing the dependence on external heat sources during the regeneration process, and realizing the energy saving and emission reduction of the internal combustion engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic structural diagram of an integrated nano-coated composite regeneration particulate trap for a special diesel engine;

[0022] Figure 2 FIG. is an exploded view of an integrated nano-coated composite regeneration particulate trap for a special diesel engine;

[0023] Figure 3 FIG. is a partial enlarged view of an integrated nano-coated composite regeneration particulate trap for a special diesel engine;

[0024] Figure 4 FIG. is a schematic internal structure diagram of an integrated nano-coated composite regeneration particulate trap for a special diesel engine.

[0025] The reference numerals in the accompanying drawings of the specification include:

[0026] 1. Inlet pipe; 2. DPF particulate trap housing assembly; 3. Discharge pipe; 4. Detection connection pipe; 5. D0C standalone oxidation catalytic converter cushion; 6. D0C standalone oxidation catalytic converter filter; 7. DPF particulate trap cushion; 8. DPF particulate trap filter; 9. External detection component; 21. First connection section; 22. Expansion pipe; 23. Second connection section; 24. First housing; 25. Second housing; 90. Outer joint; 91. Outflow hole; 92. Sealing ring; 93. Rotating pipe; 94. Docking hole; 95. Docking pipe; 96. Support block; 97. Plugging block; 98. Return spring; 99. Pressing member. Detailed implementation manner

[0027] The present invention will be further described in detail below in conjunction with the drawings and the implementation manner:

[0028] The specific implementation process is as follows:

[0029] As Figures 1-4 shown, an integrated nano - coating composite regeneration particulate trap for a special diesel engine includes an inlet pipe 1, a DPF particulate trap housing assembly 2, a discharge pipe 3, a detection connection pipe 4, a D0C standalone oxidation catalytic converter cushion 5, a D0C standalone oxidation catalytic converter filter 6, a DPF particulate trap cushion 7, a DPF particulate trap filter 8, and an external detection component 9;

[0030] DOC: Standalone oxidation catalytic converter (reduces pollutants such as carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas through catalytic oxidation reactions); DPF: Particulate trap (mainly used to capture particulate matter (PM) in the exhaust gas of diesel engines, including solid particles and liquid particles (such as oil droplets formed by unburned fuel and lubricating oil))

[0031] The DPF particulate trap housing assembly 2 is composed of a first connection section 21, an expansion pipe 22, a second connection section 23, a first housing 24, and a second housing 25, and the expansion angle of the expansion pipe 22 is 90°;

[0032] The second housing 25 is sleeved with the second connection section 23, and the second connection section 23 is sleeved with the discharge pipe 3;

[0033] The side wall of the detection connection pipe 4 is evenly provided with the outflow holes 91 in the external detection component 9, and the external detection component 9 is composed of an outer joint 90, an outflow hole 91, a sealing ring 92, a rotating pipe 93, a docking hole 94, a docking pipe 95, a support block 96, a plugging block 97, a return spring 98, and a pressing member 99;

[0034] One end of the access pipe 1 is sleeved on the detection connection pipe 4, one end of the detection connection pipe 4 is sleeved on the first connection section 21 in the DPF particulate trap housing assembly 2, the first connection section 21 is sleeved on the first housing 24, an expansion pipe 22 is arranged on the first housing 24, the expansion pipe 22 is sleeved on the second housing 25, a D0C independent oxidation catalytic converter cushion layer 5 is arranged on the inner wall of the first housing 24, a D0C independent oxidation catalytic converter filter body 6 is arranged in the D0C independent oxidation catalytic converter cushion layer 5, a DPF particulate trap cushion layer 7 is arranged on the inner wall of the second housing 25, and a DPF particulate trap filter body 8 is arranged in the DPF particulate trap cushion layer 7;

[0035] A sealing ring 92 is sleeved in the outflow hole 91, the sealing ring 92 is tightly pressed on the inner wall of the rotating pipe 93, and the rotating pipe 93 is rotatably connected to the detection connection pipe 4; docking holes 94 are uniformly arranged on the rotating pipe 93, a docking pipe 95 is sleeved in the docking holes 94, one end of the docking pipe 95 is threadedly connected with an external joint 90 through a thread; a support block 96 is fixedly sleeved in the docking pipe 95, a plugging block 97 is sleeved in the wedge-shaped hole opened in the support block 96, one end of the plugging block 97 is provided with a return spring 98 and a pressing member 99, and the return spring 98 is located between the pressing members 99. One end of the return spring 98 is fixed on the inner wall of the docking pipe 95. When a device needs to be connected to detect gas, by rotating the rotating pipe 93, the outflow hole 91 is communicated with the docking hole 94. At this time, the air pressure inside the particulate trap during operation will press the plugging block 97 in the wedge-shaped hole of the support block 96 to achieve plugging and prevent gas leakage. When detecting, the sensor is installed on the external joint 90. By rotating the external joint 90, it will move into the docking pipe 95 through thread fit. During the movement, it will squeeze the pressing member 99 and open the wedge-shaped hole in the support block 96 to allow the gas to flow through the sensor for detection. After the detection is completed, when the external joint 90 is reversed and the pressing member 99 loses pressure, the plugging block 97 will be pressed in the wedge-shaped hole of the support block 96 under the action of the return spring 98 to achieve sealing again.

[0036] In use, cordierite is used as the filter carrier material. The DOC part with a flow-through carrier is composed of the D0C independent oxidation catalytic converter cushion 5 and the D0C independent oxidation catalytic converter filter body 6, and the carrier is coated with nano-precious metal Pt particles. The DOC pore density is 400 meshes, and the pore channel width is 1.095 mm. At the same time, the DPF part with a wall-flow filter carrier is composed of the DPF particulate trap cushion 7 and the DPF particulate trap filter body 8, and the carrier is also coated with nano-precious metal Pt particles, and a cerium-based additive is added to the fuel. The DPF porosity density is 100 meshes, and the pore channel width is 2.374 mm. The DOC carrier diameter is smaller than the DPF carrier diameter. The two sections of carriers are connected by an expansion tube 22 with an expansion angle of 90°, and are integrally encapsulated to form an overall encapsulated form. The coating of nano-precious metal Pt particles increases the specific surface area of the catalytic coating, making the particulates contact the precious metal catalyst more fully. At the same time, through the catalytic action of the precious metal and the oxygen storage and release action of the cerium-based additive, NO2 is recycled during the regeneration process, realizing the composite regeneration of particulates at the exhaust temperature of the internal combustion engine; the expansion tube 22 with an expansion angle of 90° enables the air flow to expand fully and slow down the flow rate between the DOC and the DPF, so that the air flow after DOC catalytic oxidation enters the DPF at an appropriate flow rate, making the exhaust flow field suitable for the DPF to trap and oxidize particulates; reducing the control complexity of the internal combustion engine emission purification system, reducing the dependence on external heat sources during the regeneration process, and realizing the energy saving and emission reduction of the internal combustion engine.

[0037] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. An integrated nano-coating composite regenerative particulate filter for special diesel engines, characterized in that: It comprises an access pipe (1), a DPF particulate trap housing component (2), an exhaust pipe (3), a detection connection pipe (4), a DOC independent oxidation catalytic converter cushion layer (5), a DOC independent oxidation catalytic converter filter body (6), a DPF particulate trap cushion layer (7), a DPF particulate trap filter body (8) and an external detection component (9); The DPF particulate trap housing assembly (2) is composed of a first connecting section (21), an expansion tube (22), a second connecting section (23), a first housing (24) and a second housing (25), wherein the expansion angle of the expansion tube (22) is 90°; The second shell (25) is sleeved with a second connecting section (23), and the second connecting section (23) is sleeved with a discharge pipe (3); The external detection component (9) is composed of an external joint (90), an outflow hole (91), a sealing ring (92), a rotating tube (93), a docking hole (94), a docking tube (95), a supporting block (96), a blocking block (97), a return spring (98) and a pressing piece (99); the outflow holes (91) in the external detection component (9) are evenly arranged on the side wall of the detection connection tube (4); One end of the access pipe (1) is sleeved on the detection connection pipe (4), and one end of the detection connection pipe (4) is sleeved on the first connection section (21) in the DPF particulate trap housing assembly (2), and the first connection section (21) is sleeved on the first housing (24), and the first housing (24) is provided with an expansion pipe (22), and the expansion pipe (22) is sleeved on the second housing (25), and the inner wall of the first housing (24) is provided with a DOC independent oxidation catalytic converter cushion layer (5), and the DOC independent oxidation catalytic converter filter body (6) is provided in the DOC independent oxidation catalytic converter cushion layer (5), and the inner wall of the second housing (25) is provided with a DPF particulate trap cushion layer (7), and the DPF particulate trap filter body (8) is provided in the DPF particulate trap cushion layer (7); A sealing ring (92) is sleeved in the outflow hole (91), and the sealing ring (92) is tightly pressed against the inner wall of a rotating tube (93), and the rotating tube (93) is rotatably connected to the detection connecting tube (4); The rotating tube (93) is evenly provided with docking holes (94), a docking tube (95) is sleeved in the docking hole (94), and one end of the docking tube (95) is connected to an external joint (90) through threaded fitting; A support block (96) is fixedly sleeved in the butt-joint tube (95), a blocking block (97) is sleeved in a wedge-shaped hole provided in the support block (96), a return spring (98) and a pressing piece (99) are provided at one end of the blocking block (97), the return spring (98) is located between the pressing pieces (99), and one end of the return spring (98) is fixed on the inner wall of the butt-joint tube (95). The DOC independent oxidation catalytic converter pad (5) and the DOC independent oxidation catalytic converter filter body (6) constitute a DOC part using a through-flow carrier, and the DPF particulate trap pad (7) and the DPF particulate trap filter body (8) constitute a DPF part using a wall-flow filter carrier. The diameter of the DOC part is smaller than the diameter of the DPF part. The two sections of the carrier are connected by an expansion tube (22) and are integrated and packaged to form an integral package.

2. The integrated nano-coating composite regenerative particulate filter for special diesel engines according to claim 1, characterized in that: The main material of the DOC independent oxidation catalytic converter pad (5), the DOC independent oxidation catalytic converter filter (6), the DPF particulate trap pad (7) and the DPF particulate trap filter (8) is cordierite.

3. The integrated nano-coating composite regenerative particulate filter for special diesel engines according to claim 1, characterized in that: The outer surfaces of the DOC independent oxidation catalytic converter pad (5), the DOC independent oxidation catalytic converter filter (6), the DPF particulate trap pad (7) and the DPF particulate trap filter (8) are all coated with nano precious metal Pt particles.

4. The integrated nano-coating composite regenerative particulate filter for special diesel engines according to claim 1, characterized in that: The pore density of the DOC independent oxidation catalytic converter filter (6) is 400 meshes and the pore width is 1.095 mm.

5. The integrated nano-coating composite regenerative particulate filter for special diesel engines according to claim 1, characterized in that: The porosity density of the DPF particulate trap filter (8) is 100 meshes, and the pore width is 2.374 mm.

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