Mixed unit of foam metal ball pipe assembly

A technology of foam metal and mixing unit, which is applied in the directions of engine components, mechanical equipment, dispersion particle separation, etc., can solve the problems of different shapes and structures, no application of foam metal, etc., and achieves the effect of low cost and improved effect.

Inactive Publication Date: 2012-02-08
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the mixing units of the above five patents are arranged at the rear end of the urea nozzle, their shape and structure are different

Method used

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  • Mixed unit of foam metal ball pipe assembly
  • Mixed unit of foam metal ball pipe assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Select a commercially available metal foam sphere with a mesh number of 5ppi and nickel foam as a material, and process it into a sphere with a diameter of 180 mm; use a stainless steel metal fiber braided tube with a length of 600 mm and a thickness of 2 to 3 mm, with an inner diameter of 185 mm, and nickel foam Put it in the middle of the metal fiber braided pipe, use a fastening inner sleeve with a length of 100mm and an outer diameter of 90mm, use a fastened outer sleeve with a length of 105mm and an inner diameter of 120mm, close the mouth, combine the inlet and outlet of the mixing unit, and use a flange with an inner diameter of 90mm , complete welding at the inlet and outlet respectively, and prepare the main body of the mixing unit; it is arranged downstream of the nozzle of the urea reducing agent.

[0032] First, put the whole unit into a high-temperature furnace, raise the temperature of the furnace to 450-550°C and keep it warm for 40-60 minutes to complete t...

Embodiment 2

[0034] The mixer prepared in Example 1 is weighed W1, purged with clean air of 0.2Mpa for 5 minutes, weighed W2, and the weight loss of W1-W2 is less than 1.5%; then, put the mixer of the present invention back into the high-temperature furnace, Keep warm at 600°C for 40min, immediately put it into 1000mL of commercially available 32.5%wt urea reducing agent at room temperature, take it out after 5min, wash with tap water once, dry in a drying oven at 90°C for 40min, weigh W3, W2-W3 weight loss Less than 2.5%.

[0035] Installed in the exhaust pipe on the 9L diesel engine bench, the mixer is installed behind the urea reducing agent nozzle, about 5mm away from the outlet point of the nozzle, connected by flange, and the distance between the end of the mixer and the nozzle is about 302mm; start the engine, Tested under different working conditions, comparing the NOX removal rate before and after the installation of the mixer, the NOX removal rate is improved by 3~5%, and the bac...

Embodiment 3

[0037] Select a commercially available metal foam sphere with a mesh number of 5ppi, made of aluminum foam, and process it into a sphere with a diameter of 180mm; use a stainless steel metal fiber braided tube with a length of 600mm and a thickness of 3mm, and the inner diameter of the tube is 185mm, and put the nickel foam into the In the middle of the metal fiber braided pipe, use a fastening inner sleeve with a length of 100mm and an outer diameter of 90mm, and a fastened outer sleeve with a length of 105mm and an inner diameter of 120mm. Welding is completed at the inlet and outlet to prepare the main body of the mixing unit; it is arranged downstream of the nozzle of the urea reducing agent.

[0038] Put the whole spherical unit of Example 2 into a high-temperature furnace, raise the temperature with the furnace to 450-550°C and keep it warm for 40-60 minutes to complete the degreasing operation;

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Abstract

The invention relates to a mixed unit of a foam metal ball pipe assembly. The mixed unit consists of an exhaust pipe, a nozzle, a connecting flange, a welding spot, a fastening outer sleeve, a fastening inner sleeve, a metal fiber braided pipe and a foam metal ball. The mixed unit is characterized in that: the fastening outer sleeve and the fastening inner sleeve are used for fixing the metal fiber braided pipe and welded into a whole by using the connecting flange; the inside diameter of the fastening inner sleeve is D1, the diameter of the foam metal ball is D2, and the ratio D2/D1 of the diameter D2 of the ball to the sleeve diameter D1 is 1.5 to 2.5; the ratio L2/L1 of the length L2 of the fastening outer sleeve to the length L1 of the fastening inner sleeve is 3 to 5 millimeters; L2 is 300 millimeters; and the mixed unit is arranged at the downstream of the nozzle for a urea reducer. The foam metal ball is wrapped by adopting the metal fiber pipe to form the mixed unit of the concentric cylindrical foam metal ball pipe assembly for the urea reducer, a catalyst is coated on the foam metal ball, and the mixed unit is applied to mixed decomposition of the urea reducer; and the mixed unit has simple structure, is efficient and durable, and is applied in an over national 4 post treatment device.

Description

technical field [0001] The invention relates to a mixing unit composed of foamed metal bulb tubes, and the technology can be applied to the post-treatment industry of automobile exhaust. Background technique [0002] Under the pressure of emission regulations, automobile manufacturers around the world are constantly upgrading and improving the technology of foreign heavy-duty diesel engines for vehicles. ) catalytic conversion reduction technology, etc. [0003] The essence of SCR technology is to use urea to decompose NH at high temperature 3 , NH as reducing agent 3 and NO in engine exhaust x The reaction is carried out under the combined action of catalyst and temperature, and under ideal conditions, non-toxic N 2 and H 2 O, so as to achieve the purpose of purification. [0004] SCR has many advantages, for example, it can have a NOX removal efficiency of 50~85% in the range of exhaust temperature 250~550oC, and can effectively reduce the emission level of PM; SCR c...

Claims

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Application Information

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IPC IPC(8): F01N3/20B01D53/94B01D53/56
Inventor 张克金米新艳王丹崔龙应善强张苡铭刘国军马千里
Owner CHINA FIRST AUTOMOBILE
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