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AdBlue composition as reducing agent for diesel engine with SCR technology

A diesel engine and composition technology, which is applied in the field of special reducing agent - adding blue, can solve the problems of inability to guarantee emission standards, high impurity content, poor stability of the reducing agent, etc., and achieves high oxidation-reduction performance, low impurity content, and high performance. stable effect

Active Publication Date: 2013-12-11
广西兰科资源再生利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the reducing agent is prepared directly by using industrial urea or agricultural urea sold in the market, due to its high impurity content, the blockage, pollution, poisoning and other phenomena of the catalytic converter often occur, and even the precious metals in the catalytic converter lose their activity and lose their reducing effect. Another situation is to use high-purity urea or analytically pure urea to directly prepare the reducing agent. Because the tail gas has a relatively high temperature, it is well known that high-purity urea or analytically pure urea will easily decompose in advance under certain temperature conditions, thereby causing the catalyst to break down. Pollution, conversion rate decline, etc., so the stability of this type of reducing agent is extremely poor, and it cannot guarantee the national IV or above emission standards of the SCR exhaust aftertreatment system

Method used

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  • AdBlue composition as reducing agent for diesel engine with SCR technology
  • AdBlue composition as reducing agent for diesel engine with SCR technology
  • AdBlue composition as reducing agent for diesel engine with SCR technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] One, high-purity urea production process comprises the following steps (by weight parts of each component):

[0022] The first step is to put 200-800 parts by weight of pure water into the dissolution kettle, start stirring, and put in 10-40 parts by weight of 3A activated carbon adsorbent; add high-grade industrial urea, pure water and high-grade industrial The ratio of urea is 1:1-4; open the steam valve to heat up, the heating time is 30-40 minutes, and the material is heated to 90-100°C; keep warm at 90-100°C for 20-50 minutes; after the heat preservation is completed, filter the material to the crystallization tank, cooled and crystallized, and vacuum centrifuged and dried for later use.

[0023] In the second step, pure water is put into the dissolution kettle according to the weight of 200-600 parts, and stirring is started; the recrystallized and dried urea in the first step is added, and the ratio of pure water to recrystallized and dried urea is 1:1-4; open th...

Embodiment 2

[0027] One, high-purity urea production process comprises the following steps (by weight parts of each component):

[0028] (1) 400 parts by weight of pure water are dropped into the dissolving kettle, start stirring, and drop into 20 parts by weight of 3A activated carbon adsorbent;

[0029] (2) add industrial urea by weight 1000;

[0030] (3) Open the steam valve to heat up, the heating time is 30-40 minutes, and the material is heated to 90-100°C;

[0031] (4) Insulate at 90-100°C for 30 minutes;

[0032] (5) After the heat preservation is completed, the material is filtered into the crystallization kettle, cooled and crystallized, and vacuum centrifugal drying is carried out simultaneously;

[0033] (6) Pure water is dropped into dissolution kettle by 300 parts by weight, and starts to stir;

[0034] (7) add (5) recrystallized and dried urea by weight 1000;

[0035] (8) Open the steam valve to heat up, the heating time is 30-40 minutes, and the material is heated to 90...

Embodiment 3

[0047] One, high-purity urea production process comprises the following steps (by weight parts of each component):

[0048] (1) 400 parts by weight of pure water are dropped into the dissolving kettle, start stirring, and drop into 20 parts by weight of 3A activated carbon adsorbent;

[0049] (2) add industrial urea by weight 1000;

[0050] (3) Open the steam valve to heat up, the heating time is 30-40 minutes, and the material is heated to 90-100°C;

[0051] (4) Keep warm for 30 minutes at 100±2°C;

[0052] (5) After the heat preservation is completed, the material is filtered into the crystallization kettle, cooled and crystallized, and vacuum centrifugal drying is carried out simultaneously;

[0053] (6) Pure water is dropped into dissolving kettle by weight 300, starts to stir;

[0054] (7) add (5) recrystallized and dried urea by weight 1000;

[0055] (8) Open the steam valve to heat up, the heating time is 30-40 minutes, and the material is heated to 90-100°C;

[00...

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Abstract

The invention discloses AdBlue composition as a reducing agent for diesel engine with SCR technology, which meets the national IV emission standards in China minimally. Preparation of the AdBlue composition comprises highly pure urea production and AdBlue compounding. The highly pure urea is obtained by performing multiple crystallization, purification and drying on main raw materials of superior industrial urea, pure water and a 3A activated carbon adsorbent; and in the AdBlue compounding, the highly pure urea, the pure water and an ethylenediamine tetramethylene phosphate complex stabilizer are used as main raw materials. In the preparation of the AdBlue composition, the existing raw material formula and production process are improved, thus improving production efficiency, lowering material costs, reducing content of impurities, increasing purity and obtaining higher efficiency of oxidation-reduction property of products without causing blockage of a catalytic converter, pollution and poisoning, and improving stable property in long-term use. The AdBlue composition in use can help reduce emission of exhaust gases, which is favorable for environmental protection and health of a driver.

Description

technical field [0001] The invention relates to a special reductant-Tianlan used in automobile engines with national IV or higher emission standards for SCR exhaust aftertreatment systems. In particular, it is a diesel engine reducing agent blueing composition used in SCR technology. Background technique [0002] With the rapid development of society and economy, motor vehicles are on the rise year by year, and their vehicle exhaust emissions have become one of the main pollutants, directly affecting the quality of the atmospheric environment. The use of reducing agent Tianlan in diesel engines with SCR technology above National IV can reduce pollution emissions, purify the air, and improve environmental quality. Specifically, it is a reducing agent for eliminating NOx and HC in the exhaust of diesel vehicles. It is made of urea and water. The reducing agent uses the most precious platinum catalyst in the exhaust gas catalyst of the automobile to selectively carry out NOx a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/30
Inventor 戴伟平罗桂猛
Owner 广西兰科资源再生利用有限公司