Diesel engine particle trap and non-road diesel engine post-processing system
By applying DOC coating on the DPF carrier of the diesel engine particle trap and integrating the selective catalytic reducer, the problem of volume and cost of the non-road diesel engine after treatment system is solved, and the system is compact and cost reduction is achieved.
Patent Information
- Application Number
- CN202420538503.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-19
AI Technical Summary
Non-road diesel engine post-treatment systems are difficult to reduce volume under space limitations, increasing costs, especially due to the independent existence of multiple catalytic units.
The DOC coating of the diesel engine particle trap is applied to the surface of the air inlet channel of the DPF carrier, the DOC carrier is eliminated, and combined with the selective catalytic reducer, the honeycomb structure DPF carrier and liquid slurry coating are adopted in the form of cross-blocked holes. , reduce the use of precious metals, integrate pressure difference, discharge temperature NOx sensors, and use urea injection system.
It has achieved the reduction of the system size, reduced the cost, reduced the use of precious metals, adapted to the space limitations of the entire vehicle, and improved the matching of the system.
Smart Images
Figure CN222228653U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of diesel engines, in particular to a diesel engine particle collector and a non-road diesel engine after-treatment system. Background Art
[0002] DOC: Diesel catalytic oxidizer. Refers to an exhaust aftertreatment device installed in the exhaust system of a diesel engine to reduce carbon monoxide (CO), hydrocarbons (HC) in emissions and catalytically convert nitrogen monoxide into nitrogen dioxide. It includes a carrier and a coating. The DOC carrier is a honeycomb structure carrier covered with through holes. Common materials are ceramics, metals, etc. The DOC coating is a liquid slurry that is evenly coated on the surface of the DOC carrier pores. When the engine exhaust passes through the pores, a catalytic reaction occurs under the catalytic action of the coating. (See Figure 3a , 3b ).
[0003] DPF: Diesel Particulate Filter. Refers to a device installed in the exhaust system of a diesel engine, where all exhaust flows through a carrier in a wall flow manner to be filtered to reduce particulate matter in the exhaust. It usually consists of only a carrier or a carrier and a coating. The DPF carrier is a honeycomb structure carrier in the form of cross-hole plugging, and common materials are ceramics, metals, silicon carbide, etc.; the DPF coating is a liquid slurry, which is evenly coated on the surface of the DPF carrier intake channel. When the engine exhaust passes through the channel, a catalytic reaction occurs under the catalytic action of the coating; due to the cross-hole plugging, the airflow flows through the carrier in a wall flow manner to be filtered to reduce particulate matter in the exhaust. In order to emphasize the solution coated with a DPF coating, the industry usually refers to the DPF including a DPF carrier and a DPF coating as cDPF. (See Figure 4a , 4b ).
[0004] SCR: Selective Catalytic Reduction. Refers to an exhaust after-treatment device installed in the engine exhaust system to selectively catalytically reduce nitrogen oxides (NOx) in the exhaust to reduce NOx emissions. It includes an SCR carrier and an SCR coating. The SCR carrier is a honeycomb structure carrier covered with through holes. Common materials are ceramics, metals, etc.; the SCR coating is a liquid slurry that is evenly coated on the surface of the SCR carrier pores. The system also requires the addition of a substance that can produce a reducing agent (for example, a urea solution that can hydrolyze to produce NH3). When the engine exhaust passes through the pores, it undergoes a catalytic reaction with the reducing substance under the catalytic action of the coating. (See Figure 3a , 3b ).
[0005] At present, non-road National IV diesel engine after-treatment systems, models with engine displacement below 5L generally adopt the DOC+DPF technology route (see Figure 1), the engine displacement of 5L and above generally adopts the DOC+DPF+SCR technology route (see Figure 2 ). In system development, the layout space of non-road vehicles often limits the development of the system, so it is necessary to couple the catalytic units in the system to reduce the volume of the system. Utility Model Content
[0006] The purpose of the utility model is to provide a diesel engine particulate filter and a non-road diesel engine after-treatment system to reduce the system volume and reduce the cost.
[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a diesel particulate filter and a non-road diesel engine after-treatment system. The diesel particulate filter includes a DPF carrier, and the surface of the air inlet channel of the DPF carrier is provided with a DOC coating and a DPF coating.
[0008] Preferably, the DPF carrier is a honeycomb structure carrier in the form of cross-pore blocking.
[0009] Preferably, the DPF carrier is made of ceramic, metal or silicon carbide.
[0010] Preferably, the DOC coating and the DPF coating are liquid slurries.
[0011] Preferably, the DPF carrier comprises a plurality of plate-like structures parallel to each other, and the DOC coating and the DPF coating are located on surfaces of the plate-like structures close to each other.
[0012] Preferably, the diesel engine particulate filter is connected to pressure difference sensors at both ends, an exhaust temperature sensor is further provided at the inlet end, and a NOx sensor is further provided at the outlet end.
[0013] Preferably, the outlet end of the diesel particulate filter is connected to a selective catalytic reducer, and a pipeline between the diesel particulate filter and the selective catalytic reducer is connected to a urea nozzle and a urea injection system; both ends of the diesel particulate filter are connected to the differential pressure sensor, and an inlet end is further provided with a DOC pre-temperature sensor; the inlet end of the selective catalytic reducer is further provided with an SCR pre-temperature sensor, and an outlet end is provided with the NOx sensor.
[0014] In summary, the utility model includes the following beneficial technical effects:
[0015] 1. The utility model reduces the volume of the system and is easier to match the space of the whole vehicle.
[0016] 2. The DOC carrier and the exhaust temperature sensor between the DOC and DPF are cancelled, reducing system costs.
[0017] 3. The DOC coating is applied on the surface of the DPF intake duct to reduce the use of precious metals and further reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the DOC+DPF technology route generally used by existing models with engine displacement below 5L;
[0019] Figure 2 This is a schematic diagram of the DOC+DPF+SCR technology route generally used by existing models with an engine displacement of more than 5L;
[0020] Figure 3a A schematic diagram for showing airflow, carrier, and coating in DOC or SCR Figure 1 ;
[0021] Figure 3b A schematic diagram for showing airflow, carrier, and coating in DOC or SCR Figure 2 ;
[0022] Figure 4a A schematic diagram showing the airflow, carrier, and coating in cDPF Figure 1 ;
[0023] Figure 4b A schematic diagram showing the airflow, carrier, and coating in cDPF Figure 2 ;
[0024] Figure 5 It is a schematic diagram of the DDPF technical route in Example 2 of the utility model;
[0025] Figure 6 This is a schematic diagram of the DDPF+SCR technical route in Example 3 of the utility model.
[0026] Figure numerals: 1. differential pressure sensor; 2. DOC; 3. DPF; 4. pre-DOC temperature sensor; 5. post-DOC temperature sensor; 6. NOx sensor; 7. urea nozzle; 8. urea injection system; 9. pre-SCR temperature sensor; 10. SCR; 11. airflow; 12. carrier; 13. coating; 14. exhaust temperature sensor; 15. DDPF. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] Embodiment 1:
[0029] The utility model discloses a diesel particulate filter, which couples DOC2 and DPF3, that is, the DOC coating is applied on the surface of the DPF carrier air inlet channel, the DOC carrier is eliminated, and the DDPF15 or DDPF15+SCR10 technical route is adopted, thereby eliminating the space of the DOC carrier and reducing the volume of the system.
[0030] DDPF15 can be understood as a diesel particulate filter coated with a diesel catalytic oxidation coating 13, wherein the carrier 12 is a DPF carrier with a honeycomb structure in the form of cross-blocking holes; the coating 13 is a coating 13 that is a combination of the traditional DOC coating and the cDPF coating, and its precious metal content is lower than the total precious metal content of the traditional DOC coating and the cDPF coating. It is coated on the surface of the intake channel of the DPF carrier to achieve the functions of both DOC2 and DPF3.
[0031] Specifically, the diesel particulate filter includes a DPF carrier, and the surface of the DPF carrier inlet channel is provided with a DOC coating and a DPF coating. The DPF carrier is a honeycomb structure carrier in the form of cross-blocking, and the materials are commonly ceramics, metals, silicon carbide, etc.; the DOC coating and the DPF coating are liquid slurries, which are evenly coated on the surface of the DPF carrier inlet channel.
[0032] Furthermore, the DPF carrier comprises a plurality of plate-like structures parallel to each other, and the DOC coating and the DPF coating are located on surfaces of the plate-like structures close to each other.
[0033] Embodiment 2:
[0034] The utility model embodiment discloses a non-road diesel engine after-treatment system, which adopts the diesel engine particulate filter in embodiment 1, and is a DDPF15 technical route (such as Figure 5 ):
[0035] The DOC coating is applied on the surface of the air inlet channel of the DPF carrier. The high and low pressure air intake ports of the differential pressure sensor 1 are arranged at both ends of the DDPF 15 respectively. An exhaust temperature sensor 14 is arranged upstream of the DDPF 15, and a NOx sensor 6 is arranged downstream of the DDPF 15.
[0036] Embodiment 3:
[0037] The utility model embodiment discloses a non-road diesel engine after-treatment system, which adopts the diesel engine particulate filter in embodiment 1, and is a DDPF15+SCR10 technical route (such as Figure 6 ):
[0038] The DOC coating is applied on the surface of the DPF carrier air inlet channel, the high and low pressure air intake ports of the differential pressure sensor 1 are arranged at both ends of the DDPF15, a DOC2 front temperature sensor 14 is arranged upstream of the DDPF15, an SCR10 front temperature sensor 14 is arranged between the DDPF15 and the SCR10, and a NOx sensor 6 is arranged downstream of the SCR10. A urea nozzle 7 is also arranged between the DDPF15 and the SCR10, and is connected to the urea injection system 8 to inject urea aqueous solution to react with the exhaust gas.
[0039] Taking a non-road engine with a displacement of about 7L as an example, the utility model has the following effects:
[0040] Adopting the original DOC2+DPF3+SCR10 technical route, the size of DOC2 carrier 12 is Φ10.5×3.5 inches, and the precious metal content of coating 13 is 2.6308g; the size of DPF carrier is Φ10.5×6.5 inches, and the precious metal content of coating 13 is 0.9771g, and the total amount of precious metals is 3.6079g.
[0041] After adopting the current DDPF15+SCR10 technical route, only the DPF carrier is used, with a size of Φ10.5×6.5 inches. The DOC coating is applied on the surface of the DPF carrier intake channel, and the total amount of precious metal in the coating 13 is 3.5568g.
[0042] Compared with the original technical route, the carrier 12 and coating size of this proposal are reduced by 35%, and the precious metal content is reduced by 1.42%, which greatly reduces the vehicle installation space requirements and product costs.
[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A diesel particulate filter, characterized in that: The diesel particulate filter comprises a DPF carrier, the surface of the air inlet channel of the DPF carrier is provided with a DOC coating and a DPF coating, and the DPF carrier is a honeycomb structure carrier in the form of cross-hole blocking.
2. A diesel particulate filter according to claim 1, characterized in that: The DPF carrier is made of ceramic, metal or silicon carbide.
3. A diesel particulate filter according to claim 2, characterized in that: The DOC coating and the DPF coating are liquid slurries.
4. A diesel particulate filter according to claim 3, characterized in that: The DPF carrier comprises a plurality of plate-like structures parallel to each other, and the DOC coating and the DPF coating are located on surfaces of the plate-like structures close to each other.
5. A non-road diesel engine aftertreatment system, characterized in that: The diesel engine particulate filter comprises the diesel engine particulate filter according to any one of claims 1 to 4, wherein two ends of the diesel engine particulate filter are connected to a pressure difference sensor (1), an exhaust temperature sensor (14) is further provided at the inlet end, and a NOx sensor (6) is further provided at the outlet end.
6. A non-road diesel engine aftertreatment system, characterized in that: The diesel particulate filter comprises the diesel particulate filter according to any one of claims 1 to 4, wherein the outlet end of the diesel particulate filter is connected to a selective catalytic reducer, and the pipeline between the diesel particulate filter and the selective catalytic reducer is connected to a urea nozzle (7) and a urea injection system (8); the two ends of the diesel particulate filter are connected to a pressure difference sensor (1), and the inlet end is further provided with a DOC pre-temperature sensor (4); the inlet end of the selective catalytic reducer is further provided with an SCR pre-temperature sensor (9), and the outlet end is provided with a NOx sensor (6).