CN214196448U - Honeycomb ceramic carrier structure for DOC, oxidation type catalytic converter and vehicle exhaust treatment system - Google Patents
Honeycomb ceramic carrier structure for DOC, oxidation type catalytic converter and vehicle exhaust treatment system Download PDFInfo
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- CN214196448U CN214196448U CN202022638381.XU CN202022638381U CN214196448U CN 214196448 U CN214196448 U CN 214196448U CN 202022638381 U CN202022638381 U CN 202022638381U CN 214196448 U CN214196448 U CN 214196448U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The application provides honeycomb ceramic carrier structure, oxidation type catalytic converter and vehicle exhaust processing system for DOC includes: the carrier body is provided with a plurality of vent holes, and the hole density of the carrier body is 550 holes/inch2650 holes/inch2. The pore density of the honeycomb ceramic carrier structure for the DOC is higher than that of the existing honeycomb ceramic carrier structure, when the original machine exhaust gas passes through the honeycomb ceramic carrier structure for the DOC, the contact area of the original machine exhaust gas and the pore channel of the carrier body is increased, the contact area of the reaction gas and the catalyst coating is further increased, and the catalytic performance is favorably improved; meanwhile, the increase of the pore density can also cause the pore wall of the carrier body to changeThin, DOC heaies up more fast with honeycomb ceramic carrier structure, is favorable to DOC to initiate combustion fast, promotes exhaust purification performance, improves purifying effect.
Description
Technical Field
The utility model relates to a tail gas cleanup unit field particularly, relates to a honeycomb ceramic carrier structure, oxidation type catalytic converter and vehicle exhaust processing system for DOC.
Background
DOC (diesel oxidation catalyst) refers to a device that is installed in an exhaust system of a diesel engine, and reduces the emission of pollutants such as carbon monoxide (CO) and Hydrocarbons (HC) in exhaust gas through catalytic oxidation, and converts nitrogen monoxide (NO) in the exhaust pollutants into nitrogen dioxide (NO 2). Diesel engines have been widely used because of their fuel economy and high thermal efficiency. The emissions from diesel engines, which involve CO, HC, NOx and Particulate Matter (PM), not only cause serious environmental pollution, but also are a serious health hazard to humans. With the increasing strictness of the regulations, the diesel vehicle aftertreatment system meeting the national VI emission standard is formed by matching DOC, a diesel vehicle particle trap, a selective catalytic reduction catalyst and an ammonia oxidation catalyst. The diesel engine runs under the condition of lean combustion, the emission of CO and HC is low, the emission of PM and NOx can meet the requirements of regulations generally, and the main problem is that the emission of PM and NOx is reduced. The exhaust temperature of the diesel engine is lower than that of a gasoline engine, the DOC releases heat through catalytic reaction, and the oxidation of NO into NO2 can effectively promote the oxidation and purification of PM and improve the catalytic performance of downstream equipment, so that the designed DOC is required to have better low-temperature activity and NO conversion performance. Therefore, the development of the DOC with better low-temperature activity and NO conversion performance has important significance for the development of a diesel vehicle tail gas purification system meeting the national VI emission standard.
The inventor researches and discovers that the existing DOC has the following defects:
the purification effect is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a DOC is with honeycomb ceramic carrier structure, oxidation type catalytic converter and vehicle exhaust treatment system, it can improve purifying effect.
The embodiment of the utility model is realized like this:
in a first aspect, an embodiment of the present invention provides a honeycomb ceramic carrier structure for DOC, including:
the carrier body is provided with a plurality of vent holes, and the hole density of the carrier body is 550 holes/inch2650 holes/inch2。
In an alternative embodiment, the carrier body has a pore density of 550 pores/inch2600 holes/inch2。
In an alternative embodiment, the carrier body has a pore density of 600 pores/inch2～650 holes/inch2。
In an alternative embodiment, the cross-sectional shape of the vent hole is regular hexagon, circle, square or triangle, wherein the cross-section is a cross-section perpendicular to the direction of extension of the vent hole.
In an alternative embodiment, the honeycomb ceramic support structure for DOC further includes a catalyst layer provided on the pore wall of the vent hole.
In an alternative embodiment, the catalyst layer is tubular, the catalyst layer is inserted into the vent hole, and the outer peripheral surface of the catalyst layer is connected to the wall of the vent hole.
In an alternative embodiment, the catalyst layer is coated on the pore walls of the vent.
In an alternative embodiment, the ventilation opening has at least one bending section in the direction of its extent.
In a second aspect, embodiments of the present invention provide an oxidation-type catalytic converter, including:
the honeycomb ceramic support structure for a DOC according to any one of the preceding embodiments.
The third aspect, the embodiment of the utility model provides a vehicle exhaust treatment system, vehicle exhaust treatment system includes:
the oxidation-type catalytic converter of the foregoing embodiment.
The embodiment of the utility model provides a beneficial effect is:
in summary, the present embodiment provides a honeycomb ceramic carrier structure for DOC by designing the pore density of the carrier body to 550 pores/inch2650 holes/inch2The pore density is higher than that of the existing honeycomb ceramic carrier structure, when the original engine exhaust gas passes through the honeycomb ceramic carrier structure for DOC, the contact area of the original engine exhaust gas and the pore channel of the carrier body is increased, the contact area of the reaction gas and the catalyst coating is further increased, and the catalytic performance is favorably improved; simultaneously, the pore density is increased, so that the pore wall of the carrier body is thinned, the DOC uses the honeycomb ceramic carrier structure to heat up more quickly, the DOC is favorable for quick ignition, the exhaust purification performance is improved, and the purification effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a honeycomb ceramic carrier structure for DOC according to an embodiment of the present invention;
fig. 2 is a partial structural schematic diagram of a honeycomb ceramic carrier structure for DOC according to an embodiment of the present invention.
Icon:
100-a carrier body; 110-a vent; 200-catalyst layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The diesel oxidation catalytic converter is a device that is installed in a diesel exhaust system, reduces the emission of pollutants such as carbon monoxide (CO) and Hydrocarbons (HC) in exhaust gas by catalytic oxidation, and converts nitrogen monoxide (NO) in the exhaust pollutants into nitrogen dioxide (NO 2). The pore density of the honeycomb ceramic support structure of the prior DOC was designed to be 180 pores/inch2420 holes/inch2Low-temperature activity, poor NO conversion performance and high purifying effectThe fruit is poor.
Referring to fig. 1 and 2, the present embodiment provides a honeycomb ceramic carrier structure for DOC, which is installed in an exhaust system of a diesel engine, and is used for simultaneously reducing emission of pollutants such as carbon monoxide (CO) and Hydrocarbons (HC) in exhaust gas through catalytic oxidation, and converting nitrogen monoxide (NO) in the exhaust pollutants into nitrogen dioxide (NO 2).
Referring to fig. 1, in the present embodiment, a honeycomb ceramic carrier structure for DOC includes:
a carrier body 100, the carrier body 100 being provided with a plurality of vent holes 110, and the carrier body 100 having a hole density of 550 holes/inch2650 holes/inch2。
The honeycomb ceramic carrier structure for DOC according to this embodiment is obtained by designing the pore density of the carrier body 100 to 550 pores/inch2650 holes/inch2The pore density is higher than that of the existing honeycomb ceramic carrier structure, when the original engine exhaust gas passes through the honeycomb ceramic carrier structure for DOC, the contact area of the original engine exhaust gas and the pore channel of the carrier body 100 is increased, the contact area of the reaction gas and the catalyst coating is further increased, and the catalytic performance is favorably improved; simultaneously, the pore density is increased, so that the pore wall of the carrier body 100 is thinned, the DOC uses the honeycomb ceramic carrier structure to heat up more quickly, the DOC is favorable for quick ignition, the exhaust purification performance is improved, and the purification effect is improved.
In addition, when the pore density of the honeycomb ceramic carrier structure for the DOC is increased, the pore channels become small, the back pressure is increased, and the problems of the effective power and the oil consumption of the engine are influenced. In the DOC honeycomb ceramic carrier structure provided by the embodiment, the pore density of the honeycomb ceramic carrier structure for the DOC is increased to 550 pores/inch2650 holes/inch2The backpressure increases less than 15%, and when the pore density of the honeycomb ceramic carrier structure for DOC is further increased, the backpressure increases sharply, for example, the pore density increases to 750 pores/inch2At times, the backpressure increased by over 100%. Comprehensively considering the catalytic performance of DOC and the influence on the effective power and oil consumption of the engine, selecting the honeycomb ceramic carrier for DOCThe cell density of the bulk structure was 550 cells/inch2650 holes/inch2And the low-temperature activity and NO conversion performance of the DOC can be improved.
In this embodiment, the honeycomb ceramic support structure for DOC optionally has a cell density of 550 cells/inch2600 holes/inch2Or 650 holes/inch2. It should be understood that in other embodiments, the pore density may have other values, and this is not illustrated.
In other embodiments, the honeycomb ceramic support structure for the DOC has a pore density of 550 pores/inch2600 holes/inch2。
In other embodiments, the honeycomb ceramic support structure for the DOC has a pore density of 600 pores/inch2650 holes/inch2。
In addition, the carrier body 100 may be a cylinder, a square column, etc., and in the present embodiment, the carrier body 100 is taken as a square column for example.
The two ends of the vent holes 110 on the carrier body 100 are respectively located on the two end faces of the carrier body 100 in the axial direction thereof, and the plurality of vent holes 110 may be arranged in a rectangular array or in a ring shape.
Further, the shape of each vent hole 110 may be circular, square, triangular, or regular hexagonal, etc. It should be understood that the plurality of vent holes 110 may be sized identically for ease of manufacturing. Obviously, in other embodiments, the plurality of ventilation holes 110 may not be identically sized.
Further, the vent holes 110 may extend in a linear direction; or, the vent holes 110 extend along a curve, that is, the vent holes 110 have at least one bent section in the extending direction thereof, so that the length of the vent holes 110 can be increased on the premise that the length of the carrier body 100 is fixed, and the time for the tail gas to flow in the vent holes 110 is long, thereby improving the purification effect.
In this embodiment, the vent holes 110 on the carrier body 100 may be formed integrally with the carrier body 100 when the carrier body 100 is processed, for example, the carrier body 100 is formed integrally with cordierite honeycomb ceramic. Alternatively, in other embodiments, the carrier body 100 includes a cylinder and a plurality of partitions inserted into the cylinder, the partitions being arranged in an intersecting manner to define a plurality of air vents 110, and the partitions and the inner wall of the cylinder defining the plurality of air vents 110.
Referring to fig. 2, in the present embodiment, optionally, the honeycomb ceramic carrier structure for DOC further includes a catalyst layer 200 disposed on the pore wall of the vent 110. The catalyst layer 200 may be coated on the hole walls of the vent holes 110, and the catalyst layer 200 may completely cover the hole walls of the vent holes 110, that is, the catalyst layer 200 is a tubular structure, the catalyst layer 200 is inserted into the vent holes 110, and the outer circumferential surface of the catalyst layer 200 is connected to the corresponding hole walls of the vent holes 110. When the exhaust gas passes through the vent holes 110 of the carrier body 100, the exhaust gas contacts and reacts with the catalyst layers 200 on the wall of the vent holes 110, thereby functioning to purify the exhaust gas.
The honeycomb ceramic carrier structure for DOC provided in this example had a cell density of 550 cells/inch2650 holes/inch2And the purification effect is good.
The embodiment also provides an oxidation type converter, which comprises the honeycomb ceramic carrier structure for the DOC mentioned in the embodiment, and the oxidation type converter has stable performance and good purification effect.
TABLE 1 comparison of DOCs of different pore densities for backpressure under steady-state eight-regime test cycle conditions
The embodiment also provides a vehicle exhaust treatment system which comprises the oxidation type catalytic converter mentioned in the embodiment and has a good exhaust treatment effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A honeycomb ceramic support structure for a DOC, comprising:
the catalyst carrier comprises a carrier body and a catalyst layer, wherein the carrier body is provided with a plurality of vent holes, and the hole density of the carrier body is 550 holes/inch2650 holes/inch2And the catalyst layer is arranged on the pore wall of the vent hole.
2. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the carrier body has a pore density of 550 pores/inch2600 holes/inch2。
3. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the carrier body has a pore density of 600 pores/inch2650 holes/inch2。
4. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the cross section of the vent hole is in a shape of a regular hexagon, a circle, a square or a triangle, wherein the cross section is a section perpendicular to the extending direction of the vent hole.
5. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the catalyst layer is tubular, the catalyst layer is inserted into the vent hole, and the peripheral surface of the catalyst layer is connected with the hole wall of the vent hole.
6. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the catalyst layer is coated on the pore wall of the vent hole.
7. The honeycomb ceramic support structure for a DOC according to claim 1, wherein:
the vent hole is provided with at least one bending section in the extending direction.
8. An oxidation catalytic converter, characterized by comprising:
a honeycomb ceramic support structure for DOC according to any one of claims 1 to 7.
9. A vehicle exhaust treatment system, comprising:
the oxidation catalytic converter of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022638381.XU CN214196448U (en) | 2020-11-13 | 2020-11-13 | Honeycomb ceramic carrier structure for DOC, oxidation type catalytic converter and vehicle exhaust treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022638381.XU CN214196448U (en) | 2020-11-13 | 2020-11-13 | Honeycomb ceramic carrier structure for DOC, oxidation type catalytic converter and vehicle exhaust treatment system |
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| Publication Number | Publication Date |
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| CN214196448U true CN214196448U (en) | 2021-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022638381.XU Active CN214196448U (en) | 2020-11-13 | 2020-11-13 | Honeycomb ceramic carrier structure for DOC, oxidation type catalytic converter and vehicle exhaust treatment system |
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| CN (1) | CN214196448U (en) |
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