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Metal carrier unit for exhaust gas aftertreatment

A technology of exhaust after-treatment and metal carrier, applied in exhaust devices, engine components, mufflers, etc., can solve the problems of poor vehicle fuel economy, increase filter area, change the uniformity of airflow field distribution, etc. Blockage possible, effect of increasing the area

Active Publication Date: 2017-06-20
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The ceramic carrier used in post-processing usually uses a special cermet 3M gasket to 'include' the carrier, and fix the carrier and the shell package together to meet the anti-vibration requirements of the vehicle's cold and hot states, but , on the one hand, the cost of materials is high, on the other hand, the packaging must use robot production lines, which affects the competitiveness of products
[0007] However, the metal carrier unit used above is not suitable for using the 3M gasket of this metal ceramic when packaging.
Here, it is not to say that there is no problem with the packaging of the metal carrier. On the contrary, various technical measures must be taken to meet the anti-vibration requirements of the cold and hot states of the vehicle; for example, the columnar metal carrier can be integrated The brazing process is carried out in a vacuum brazing furnace. Although this process can well solve the strength problem of the carrier unit, the cost of equipment and production process is high, and it is completely inconsistent with the green process of low-carbon energy saving and environmental protection. Features: It is also possible to install support structures at both ends of the columnar metal carrier, or to 'cross the ribs' between the columnar metal carriers, etc. These measures have changed the most basic airflow field of the carrier The uniformity of the distribution, the result is 'local uneven force', which will cause damage in the form of displacement and other forms when passing the GB or HJ vibration test
[0008] Similarly, metal carriers with various wire mesh structures have appeared on the market. However, there are different degrees of clogging problems in this kind of samples in the prescribed 500~1000h bench aging test. The back pressure index of the measured samples The detection is greater than 15kpa, and the highest is 23kpa. When the back pressure is high, the fuel economy of the vehicle will deteriorate. The reason for these clogging problems comes down to the macroscopic results of this type of carrier and the optimization of the microstructure. The air flow channel should be optimized while the area (filter bed volume) is used;

Method used

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  • Metal carrier unit for exhaust gas aftertreatment
  • Metal carrier unit for exhaust gas aftertreatment
  • Metal carrier unit for exhaust gas aftertreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take a woven mesh of SUS304 stainless steel with a wire diameter of 0.1mm, length D1=6000mm, width d1=300mm; draw the center line along the length direction, and cut / cut out a length of 150mm on the side of the center line that is 150mm. , 39 slits at intervals of 150mm, forming 40 squares of 150mm×150mm, along one corner of each square, according to 45 o The direction of the corner, the two adjacent sides are folded into 45 o An equilateral triangle at the corner; use an industrial resistance welding machine on each folded equilateral triangle to weld at least 20 points to make it into one; as the first filter; similarly, prepare the second one of the above specifications The filter sheet can also be prepared at one time with a length of 12000mm, which is divided into two pieces; the prepared filter sheet is rolled once by a three-roller machine, and the corners are more neat, so that it is regular to one side Straight filter with a sharp corner on one side; two filte...

Embodiment 2

[0022] Take the sintered mat of SUS304 stainless steel fiber with a thickness of 1.2mm, length D1=4500mm, width d1=300mm; draw the centerline along the length direction, and cut / cut out 150mm on the side of the centerline that is 150mm 29 slits with a length of 150mm to form 30 squares of 150mm×150mm, along one corner of each square, according to 45 o The direction of the corner, the two adjacent sides are folded into 45 o The equilateral triangle of angle; Use industrial welding machine on each equilateral triangle after folding, spot weld at least 20 points, make it become one; As the first filter disc; Similarly, prepare the second above-mentioned specification The filter sheet can also be prepared at one time with a length of 9000mm, which is divided into two pieces; the prepared filter sheet is rolled once with a three-roller machine, and the corners are more neat, making it regular to one side Straight filter with a sharp corner on one side; two filters after rolling or...

Embodiment 3

[0025] Take 6 layers of 0.3mm wire diameter SUS304 stainless steel gas-liquid filter screen, length D1=6000mm, width d1=300mm; draw the center line along the length direction, on the side of the center line, that is, the 150mm side, cut the vertical center line / Cut out 39 slits with a length of 150mm and an interval of 150mm to form 40 squares of 150mm×150mm, along one corner of each square, according to 45 o The direction of the corner, the two adjacent sides are folded into 45 oAn equilateral triangle at the corner; use an industrial welding machine on each equilateral triangle after folding, and spot weld at least 20 points to make it into one; as the first filter disc; similarly, prepare the second above-mentioned specification The filter sheet with a length of 12000mm can also be prepared at one time, which is divided into two pieces; the prepared filter sheet is rolled once with a three-roller machine, and the corners are more neat, making it regular. The side is stra...

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Abstract

The invention relates to a metal carrier unit for tail gas post-treatment, which is characterized in that: using wire mesh, sintered felt or vapor-liquid filter screen, cutting into several squares with a width of 1 / 2 on one side of the axis in the length direction, several squares The corners are folded into several equilateral triangles, and after rolling or spot welding, one side is straight and the other side is sharp. The two pieces of the filter are stacked symmetrically, and the vehicle exhaust gas is produced by winding along one end. The metal carrier unit is used for post-processing, so that many evenly distributed wedge-shaped buffer spaces are distributed regardless of the inlet or outlet, which can reduce the back pressure without reducing the filtering effect and prolong the replacement and maintenance intervals. Therefore, as a post-processing Carrier, this product can be used as a carrier for DOC, POC, DPF and SCR, and has certain practical significance and high practical value.

Description

technical field [0001] The invention relates to a metal carrier unit for tail gas post-treatment, which is applied to the DOC, SCR, DPF or POC post-treatment industry of automobile tail gas. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. In the selection of technical means to meet the emission standards of traditional vehicles, people still face many difficulties, for example, how to choose the carrier and catalyst for post-treatment. [0003] The post-processing carrier is the key factor to constitute the vehicle after-processing platform. Up to now, most of the post-processing carriers are imported ceramic carriers. Similarly, some mature metal carriers with special structures are also monopolized by foreign technologies and patents, which has become a key factor restricting the development of China's post-processing industry. [0004] Therefore, how to obtain low-cost and high-performance post-processing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28
Inventor 米新艳张克金崔龙陈慧明王丹张喆刘国军孙国静魏传盟刘忠政
Owner CHINA FIRST AUTOMOBILE