Composite additive of automobile urea solution

A technology of compound additives and urea for vehicles, which is applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of clogging of SCR system, poor dispersibility and unevenness of urea, etc., and achieve the effect of improving dispersibility.

Inactive Publication Date: 2014-12-24
赵根华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor dispersibility of urea in the existing urea solution, large and uneven atomization size, easy generation of deposits in the SCR system, and blockage of the SCR system, the present invention provides a composite additive for urea solution, It can significantly improve the dispersibility of urea in urea solution, reduce the atomization size and increase the NH 3 conversion efficiency, thereby avoiding SCR system clogging

Method used

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  • Composite additive of automobile urea solution
  • Composite additive of automobile urea solution
  • Composite additive of automobile urea solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Denote the vehicle urea solution as S 0 , wherein the mass fraction of urea is 32.5%; then add four different composite additives S 1 , S 2 , S 3 and S 4 ; Change S in urea solution as shown in Table I 1 , S 2 , S 3 and S 4 The concentration of the surface tension was measured respectively and listed in Table I.

[0026] Where: S 1 , S 2 , S 3 and S 4 The structural formula is as follows:

[0027]

[0028]

[0029] Table Ⅰ The effect of Gemini surfactant on the surface tension of vehicle urea solution

[0030]

[0031] As can be seen from Table 1, as the surfactant concentration increases, the surface tension of the urea solution decreases, and the activity of the surfactant increases, and the low surface tension reduces the required energy barrier when the solution is dispersed, which is conducive to improving the dispersibility of the urea solution .

Embodiment 2

[0033] Use laser Doppler dynamic particle analyzer (PDA) to blank car urea solution and add composite additive S described in embodiment 1 respectively 1 , S 2 , S 3 or S 4 The vehicle urea solution was used for the spray characteristic test.

[0034] The mass concentration of urea in the urea solution is 32.5%, and the content of the composite additive is 100ppm.

[0035] Select five cross-sections on the spray axis, select five measuring points for each cross-section, and calculate the average diameter of the droplets. The experimental results are shown in Tables II-V.

[0036] It can be clearly seen from the data in the table that after the composite additive is added, the average diameter of the droplets on the cross section becomes significantly smaller.

[0037] Table Ⅱ Composite Additive S 1 Influence on spray characteristics

[0038]

[0039]

[0040] Table Ⅲ Composite Additive S 2 Influence on spray characteristics

[0041]

[0042] Table Ⅳ Composite ...

Embodiment 3

[0047] Prepare the urea solution for vehicles with a mass concentration of 32.5%, then add methyl silicone oil and 200ppm cetyl alcohol polyoxyethylene ether (the number of ethoxylates is 5) to it, and then add concentration S as described in Example 1 shown in Table VI 1 , S 2 , S 3 and S 4 .

[0048] The prepared solutions were applied to the bench test of the engine, and the test temperature was between 250°C and 280°C to determine the effect of the amount of compound additives added on the reduction of deposits in the SCR system. The results are listed in Table VI.

[0049] Table Ⅵ The effect of the addition amount of compound additives on the reduction of sediment

[0050]

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PUM

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Abstract

The invention discloses composite additive of an automobile urea solution. The composite additive comprises one or more Gemini surface active agents mixed in any ratio, wherein the content of the Gemini surface active agents in the automobile urea solution is 10ppm to 5,000ppm. The composite additive also comprises a cosurfactant and/or an anti-foaming agent. The cosurfactant is any one or a mixture of several of direct-chain alcohol polyoxyethylene ether, branch-chain alcohol polyoxyethylene ether, aliphatic amine polyoxyethylene ether and alkylphenol polyoxyethylene ether in any ratio. The anti-foaming agent is a mixture of dimethicone and one or more of C2 to C8 in any ratio. By adopting the composite additive for the urea solution, the dispersion property of urea in the urea solution can be obviously improved, the atomizing size can be reduced, the NH3 conversion efficiency can be improved, and the blockage of an SCR (selective catalytic reaction) system can be avoided.

Description

technical field [0001] The invention relates to the field of urea solution for vehicles, in particular to a 3 A compound additive for vehicle urea solutions with high conversion efficiency. Background technique [0002] Exhaust emissions from automobiles (especially diesel vehicles) have become one of the main sources of air pollution. Nitrogen oxides (NO x ) is the main component of automobile exhaust. NO x Exhaust gas treatment devices are required to control, such as: lean nitrogen oxide adsorption technology (LNT), selective catalytic reduction technology (SCR), oxidation catalytic converter technology (DOC), exhaust gas recirculation + particle filter technology (EGR+DPF ), etc., the SCR system is widely used in the exhaust gas treatment of heavy-duty diesel locomotives. [0003] SCR technology is to reduce the generation of particulate matter (PM) by strengthening the internal combustion of the engine, and then use urea solution to reduce NO X Catalytic reduction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/94
Inventor 赵根华
Owner 赵根华
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