Integrated nano-coated composite regenerative particulate filter for special diesel engines
By adopting an integrated nano-coating composite regenerative particulate filter coated with cordierite and nano-precious metal Pt particles, the problems of high energy consumption and complex control of traditional particulate filters are solved, and energy conservation and emission reduction of internal combustion engines are achieved.
Patent Information
- Application Number
- CN202510547478.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2045-04-28
AI Technical Summary
The traditional particulate filter regeneration process has high energy consumption, high cost and complex control, making it difficult to meet strict internal combustion engine emission standards and affecting the energy conservation and emission reduction effects of the internal combustion engine.
An integrated nano-coating composite regeneration particulate filter is constructed by using cordierite as the filter carrier, combined with nano-precious metal Pt particle coating and cerium-based additives. Through the catalytic effect of precious metals and the oxygen storage and release effect of cerium-based additives, the composite regeneration of particles at the exhaust temperature of the internal combustion engine is achieved, reducing dependence on external heat sources.
The control complexity of the internal combustion engine emission purification system is reduced, the energy consumption of the regeneration process is reduced, and the energy saving and emission reduction effects of the internal combustion engine are achieved.
Smart Images
Figure CN120159577B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of energy conservation and emission reduction, and in particular to an integrated nano-coating composite regeneration particulate filter for special diesel engines. Background Art
[0002] The particulate filter is a recognized and most effective post-processing purification device for controlling particulate emissions from internal combustion engines and has been widely used. After the particulate filter has been working for a period of time, it needs to be oxidized and removed through an oxidation reaction, otherwise it will cause excessive back pressure on the internal combustion engine, reduce internal combustion engine performance, increase fuel consumption, and even damage the internal combustion engine in severe cases. The process of oxidizing and removing particulates by the particulate filter is called the regeneration process. Its principle is to generate CO2 through an oxidation reaction between O2 in the exhaust and particulates (mainly carbon). The oxidation temperature of the traditional particulate filter regeneration process reaches 550℃-600℃. At present, it mainly uses external heat source heating methods such as microwave heating, fuel injection combustion assistance, and electric heating for regeneration. On the one hand, the heat source increases the cost of the internal combustion engine emission purification device, and on the other hand, it increases the energy consumption of the internal combustion engine system, which is not conducive to energy conservation and emission reduction of the internal combustion engine. After the implementation of the new emission standards, due to the increasingly stringent requirements on particulate emissions in the exhaust gas of the internal combustion engine, the regeneration frequency of the traditional particulate filter will become more frequent, the regeneration energy consumption will increase, and the complexity of the control system will increase, which will further increase the energy consumption of the internal combustion engine and increase the cost. In order to take into account the low emissions and fuel economy of the internal combustion engine, it is necessary to design an integrated nano-coated composite regenerated particulate filter and adopt a new particulate filter regeneration method to reduce the control complexity of the internal combustion engine emission purification system, reduce the dependence of the regeneration process on external heat sources, and achieve energy conservation and emission reduction of the internal combustion engine. Summary of the Invention
[0003] The present invention is intended to provide an integrated nano-coating composite regenerative particulate filter for special diesel engines to solve the problems raised in the above background technology.
[0004] In order to achieve the above object, the present invention provides the following technical solutions:
[0005] An integrated nano-coated composite regenerative particulate filter for a special diesel engine, comprising an access pipe, a DPF particulate filter housing assembly, an exhaust pipe, a detection connection pipe, a DOC stand-alone oxidation catalytic converter mat, a DOC stand-alone oxidation catalytic converter filter, a DPF particulate filter mat, a DPF particulate filter body, and an external detection assembly;
[0006] The DPF particulate trap housing assembly consists of a first connecting section, an expansion tube, a second connecting section, a first housing and a second housing, wherein the expansion angle of the expansion tube is 90°;
[0007] A second connecting section is sleeved on the second shell, and a discharge pipe is sleeved on the second connecting section;
[0008] The external detection assembly consists of an external joint, an outflow hole, a sealing ring, a rotating tube, a docking hole, a docking tube, a support block, a blocking block, a reset spring and a pressing piece; the outflow holes in the external detection assembly are evenly opened on the side wall of the detection connecting tube;
[0009] One end of the access pipe is sleeved on the detection connecting pipe, and one end of the detection connecting pipe is sleeved on the first connecting section of the DPF particulate trap housing assembly. The first connecting section is sleeved on the first housing. The first housing is provided with an expansion tube, and the expansion tube is sleeved on the second housing. The inner wall of the first housing is provided with a DOC stand-alone oxidation catalytic converter mat, and a DOC stand-alone oxidation catalytic converter filter is disposed in the DOC stand-alone oxidation catalytic converter mat. The inner wall of the second housing is provided with a DPF particulate trap mat, and a DPF particulate trap filter is disposed in the DPF particulate trap mat.
[0010] A sealing ring is sleeved in the outflow hole, and the sealing ring is tightly pressed against the inner wall of the rotating tube, and the rotating tube is rotatably connected to the detection connecting tube;
[0011] The rotating tube is evenly provided with docking holes, a docking tube is sleeved in the docking hole, and one end of the docking tube is connected to an external joint through threaded fitting;
[0012] A support block is fixedly sleeved in the butt joint tube, and a blocking block is sleeved in the wedge-shaped hole of the support block. A return spring and a pressing piece are provided at one end of the blocking block. The return spring is located between the pressing pieces, and one end of the return spring is fixed to the inner wall of the butt joint tube.
[0013] The DOC stand-alone oxidation catalytic converter mat and DOC stand-alone oxidation catalytic converter filter constitute a DOC portion using a flow-through carrier, while the DPF particulate trap mat and DPF particulate trap filter constitute a DPF portion using a wall-flow filter carrier. The diameter of the DOC portion is smaller than that of the DPF portion. The two carrier sections are connected by an expansion tube and are integrated and packaged to form an integral package.
[0014] 2. The integrated nano-coated composite regenerative particulate filter for a specialty diesel engine according to claim 1, characterized in that the main body material of the DOC stand-alone oxidation catalytic converter mat, DOC stand-alone oxidation catalytic converter filter, DPF particulate filter mat, and DPF particulate filter is cordierite.
[0015] 3. The integrated nano-coated composite regenerative particulate filter for a specialty diesel engine according to claim 1, characterized in that the outer surfaces of the DOC stand-alone oxidation catalytic converter mat, the DOC stand-alone oxidation catalytic converter filter, the DPF particulate filter mat, and the DPF particulate filter are all coated with nano-precious metal Pt particles.
[0016] 4. The integrated nano-coated composite regenerative particulate filter for a specialty diesel engine according to claim 1, wherein the DOC stand-alone oxidation catalytic converter filter has a pore density of 400 mesh and a pore width of 1.095 mm.
[0017] 5. The integrated nano-coated composite regenerative particulate filter for a special diesel engine according to claim 1, wherein the porosity density of the DPF filter is 100 mesh and the pore width is 2.374 mm.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] The present invention uses cordierite as a filter carrier material, and comprises a DOC stand-alone oxidation catalytic converter mat layer and a DOC stand-alone oxidation catalytic converter filter body, forming a DOC portion using a through-flow carrier. The carrier is coated with nano-precious metal particles, and the DOC has a pore density of 400 mesh and a pore width of 1.095 mm. Simultaneously, a DPF portion, comprising a DPF particulate trap mat layer and a DPF particulate trap filter body, forms a wall-flow filter carrier. The carrier is also coated with nano-precious metal particles, and a cerium-based additive is added to the fuel. The DPF has a porosity density of 100 mesh and a pore width of 2.374 mm. The diameter of the DOC carrier is smaller than that of the DPF carrier, and a 90° expansion angle is used between the two carrier segments. The expansion tubes are connected and integratedly packaged to form an overall package. The specific surface area of the catalytic coating is increased by coating with nano-precious metal particles, so that the particles are in more complete contact with the precious metal catalyst. At the same time, through the catalytic effect of the precious metal and the oxygen storage and release effect of the cerium-based additives, NO2 is recycled during the regeneration process, and the composite regeneration of the particles at the exhaust temperature of the internal combustion engine is achieved; the expansion tube with an expansion angle of 90° allows the airflow to be fully expanded and the flow rate to be slowed down between the DOC and the DPF, so that the airflow after catalytic oxidation by the DOC enters the DPF at an appropriate flow rate, making the exhaust flow field suitable for the DPF to capture and oxidize particles; reducing the control complexity of the internal combustion engine emission purification system, reducing the dependence of the regeneration process on external heat sources, and achieving energy saving and emission reduction of the internal combustion engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 The figure is a schematic diagram of the structure of an integrated nano-coating composite regenerative particulate filter for special diesel engines;
[0021] Figure 2 An exploded view of an integrated nano-coated composite regenerative particulate filter for a specialty diesel engine;
[0022] Figure 3 A partial enlarged view of an integrated nano-coating composite regenerative particulate filter for a special diesel engine;
[0023] Figure 4 Schematic diagram of the internal structure of an integrated nano-coating composite regenerative particulate filter for special diesel engines.
[0024] The reference numerals in the drawings of the specification include:
[0025] 1. Access pipe; 2. DPF particulate trap housing assembly; 3. Emission pipe; 4. Detection connection pipe; 5. DOC stand-alone oxidation catalytic converter gasket; 6. DOC stand-alone oxidation catalytic converter filter; 7. DPF particulate trap gasket; 8. DPF particulate trap filter; 9. External detection assembly; 21. First connecting section; 22. Expansion tube; 23. Second connecting section; 24. First housing; 25. Second housing; 90. External connector; 91. Outflow hole; 92. Sealing ring; 93. Rotating tube; 94. Docking hole; 95. Docking pipe; 96. Support block; 97. Blocking block; 98. Return spring; 99. Pressing piece. DETAILED DESCRIPTION
[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:
[0027] The specific implementation process is as follows:
[0028] like Figure 1-4 As shown, an integrated nano-coated composite regenerative particulate filter for a specialty diesel engine includes an access pipe 1, a DPF particulate filter housing assembly 2, an exhaust pipe 3, a detection connection pipe 4, a DOC stand-alone oxidation catalytic converter mat 5, a DOC stand-alone oxidation catalytic converter filter 6, a DPF particulate filter mat 7, a DPF particulate filter 8, and an external detection assembly 9.
[0029] DOC: Standalone Oxidation Catalytic Converter (reducing carbon monoxide (CO), hydrocarbons (HC) and other pollutants in exhaust gas through catalytic oxidation reaction); DPF: Particulate Filter (mainly used to capture particulate matter (PM) in diesel engine exhaust, including solid particles and liquid particles (such as oil droplets formed by unburned fuel and lubricating oil))
[0030] The DPF particulate trap housing assembly 2 consists of a first connecting section 21, an expansion tube 22, a second connecting section 23, a first housing 24 and a second housing 25. The expansion angle of the expansion tube 22 is 90°.
[0031] The second shell 25 is sleeved with the second connecting section 23, and the second connecting section 23 is sleeved with the discharge pipe 3;
[0032] Outflow holes 91 of the external detection assembly 9 are evenly opened on the side wall of the detection connection pipe 4. The external detection assembly 9 consists 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 support block 96, a blocking block 97, a return spring 98 and a pressing member 99.
[0033] One end of the access pipe 1 is sleeved onto the detection connecting pipe 4, and one end of the detection connecting pipe 4 is sleeved onto the first connecting section 21 of the DPF particulate trap housing assembly 2. The first connecting section 21 is sleeved onto the first housing 24. The first housing 24 is provided with an expansion pipe 22, which is sleeved onto the second housing 25. The inner wall of the first housing 24 is provided with a DOC stand-alone oxidation catalytic converter mat 5, and a DOC stand-alone oxidation catalytic converter filter 6 is disposed in the DOC stand-alone oxidation catalytic converter mat 5. The inner wall of the second housing 25 is provided with a DPF particulate trap mat 7, and a DPF particulate trap filter 8 is disposed in the DPF particulate trap mat 7.
[0034] A sealing ring 92 is sleeved in the outflow hole 91, and the sealing ring 92 is tightly pressed on the inner wall of the rotating tube 93, and the rotating tube 93 is rotatably connected to the detection connecting tube 4; docking holes 94 are evenly opened on the rotating tube 93, and a docking tube 95 is sleeved in the docking hole 94, and one end of the docking tube 95 is connected to the external joint 90 through a threaded fit; a support block 96 is fixedly sleeved in the docking tube 95, and a blocking block 97 is sleeved in the wedge-shaped hole opened in the support block 96, and one end of the blocking block 97 is provided with a return spring 98 and a top pressure piece 99, and the return spring 98 is located between the top pressure pieces 99, and one end of the return spring 98 is fixed on the inner wall of the docking tube 95, and the equipment needs to be connected to the gas During testing, the outflow hole 91 and the docking hole 94 are connected to each other by rotating the rotating tube 93. At this time, the internal air pressure during the operation of the particulate collector will press the blocking block 97 against the wedge-shaped hole of the support block 96 to achieve sealing and prevent gas leakage. During testing, the sensor is installed on the external joint 90, and the external joint 90 is rotated to move toward the docking tube 95 through threaded fitting. During the movement, the pressing piece 99 will be squeezed and the wedge-shaped hole in the support block 96 will be opened to allow gas to flow through the sensor for testing. After the test is completed, the external joint 90 is reversed and the pressing piece 99 loses pressure. The blocking block 97 will be pressed against the wedge-shaped hole in the support block 96 under the action of the reset spring 98 to achieve sealing again.
[0035] During use, cordierite is used as the filter carrier material. The DOC portion, which adopts a through-flow carrier, is composed of a DOC independent oxidation catalytic converter mat 5 and a DOC independent oxidation catalytic converter filter body 6. The carrier is coated with nano-precious metal Pt particles. The DOC pore density is 400 mesh and the channel width is 1.095 mm. At the same time, the DPF portion, which adopts a wall-flow filter carrier, is composed of a DPF particulate trap mat 7 and a DPF particulate trap filter body 8. The carrier is also coated with nano-precious metal Pt particles, and a cerium-based additive is added to the fuel. The porosity density of the DPF is 100 mesh and the channel width is 2.374 mm. The diameter of the DOC carrier is smaller than that of the DPF carrier, and the expansion angle between the two carriers is 90°. The expansion tube 22 is connected and integratedly packaged to form an overall package. The specific surface area of the catalytic coating is increased by coating the nano-precious metal Pt particles, so that the particles are in more complete contact with the precious metal catalyst. At the same time, through the catalytic effect of the precious metal and the oxygen storage and release effect of the cerium-based additive, NO2 is recycled during the regeneration process, and the composite regeneration of the particles at the exhaust temperature of the internal combustion engine is realized; the expansion tube 22 with an expansion angle of 90° allows the airflow to be fully expanded and the flow rate to be slowed down between the DOC and the DPF, so that the airflow after catalytic oxidation of the DOC enters the DPF at an appropriate flow rate, making the exhaust flow field suitable for the DPF to capture and oxidize particles; reducing the control complexity of the internal combustion engine emission purification system, reducing the dependence of the regeneration process on external heat sources, and realizing energy saving and emission reduction of the internal combustion engine.
[0036] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.
Claims
1. An integrated nano-coated composite regenerative particulate filter for a special diesel engine, characterized by: The invention comprises an access pipe (1), a DPF particulate trap housing assembly (2), an exhaust pipe (3), a detection connection pipe (4), a DOC independent oxidation catalytic converter pad (5), a DOC independent oxidation catalytic converter filter body (6), a DPF particulate trap pad (7), a DPF particulate trap filter body (8) and an external detection assembly (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°; A second connecting section (23) is sleeved on the second shell (25), and a discharge pipe (3) is sleeved on the second connecting section (23); The external detection assembly (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 member (99); the outflow holes (91) in the external detection assembly (9) are evenly arranged on the side wall of the detection connecting tube (4); One end of the access pipe (1) is sleeved on the detection connecting pipe (4), and one end of the detection connecting pipe (4) is sleeved on the first connecting section (21) in the DPF particulate trap housing assembly (2), the first connecting section (21) is sleeved on the first housing (24), the first housing (24) is provided with an expansion pipe (22), the expansion pipe (22) is sleeved on the second housing (25), the inner wall of the first housing (24) is provided with a DOC independent oxidation catalytic converter pad (5), the DOC independent oxidation catalytic converter pad (5) is provided with a DOC independent oxidation catalytic converter filter body (6), the inner wall of the second housing (25) is provided with a DPF particulate trap pad (7), and the DPF particulate trap pad (7) is provided with a DPF particulate trap filter body (8); A sealing ring (92) is sleeved in the outflow hole (91), and the sealing ring (92) is tightly pressed against the inner wall of the 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 engagement; 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 to the inner wall of the butt-joint tube (95); The DOC independent oxidation catalytic converter mat (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 mat (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 that 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 overall package.
2. The integrated nano-coating composite regenerative particulate filter for a special diesel engine 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 a special diesel engine 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 a special diesel engine according to claim 1, characterized in that: The pore density of the DOC independent oxidation catalytic converter filter (6) is 400 mesh and the pore width is 1.095 mm.
5. The integrated nano-coating composite regenerative particulate filter for a special diesel engine according to claim 1, characterized in that: The porosity density of the DPF particulate trap filter (8) is 100 mesh, and the pore width is 2.374 mm.
Citation Information
Patent Citations
Non-road mobile machinery composite regenerated particle post-treatment device
CN112127969A
Partition type diesel particulate filter
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