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Ultra-low temperature urea solution used for vehicle

A vehicle-used urea and ultra-low temperature technology, which is applied to the separation of dispersed particles, chemical instruments and methods, and separation methods, can solve the problems of not being able to run through Shanhaiguan, increase system complexity, pollute catalysts, etc., and achieve saving in evaporation and granulation processes , high practical value, low content effect

Active Publication Date: 2015-05-13
HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, low-quality diesel exhaust treatment fluid will pollute the catalyst in the SCR catalytic reaction tank, causing serious consequences
[0003]At present, the freezing point of traditional urea for vehicles is around -11°C, which means that vehicles using SCR technology cannot run northwards through the Shanhaiguan Pass in winter, which is very important for traffic Developed today is clearly intolerable
The method to solve the problems of traditional vehicle urea is generally to add antifreeze circulation heating or electric heating system and heat preservation system to the traditional vehicle urea system, that is, add additional parts such as heating pipe circuit, temperature sensor, insulation layer, etc., not only The cost of each car increased by about 1200 yuan, which undoubtedly increased the complexity of the system and the failure rate was high. In addition, when starting the car in winter, the vehicle needs to be idling for a certain period of time. After the temperature of the engine coolant rises, it relies on circulating coolant to melt Frozen urea and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Select 27 parts of 75wt% urea solution, 25 parts of analytically pure ammonium formate, 12 parts of analytically pure propylene glycol, and 36 parts of high-purity water; stir at room temperature (25°C) until completely dissolved, and filter through a filter membrane with a pore size of 0.5 μm. It is the ultra-low temperature vehicle urea solution of the present invention. According to the measurement, the freezing point of the ultra-low temperature vehicle urea solution is -45°C, it is odorless, the appearance is clear and transparent, and the density is 1.089g / cm 3 , the content of biuret is 0.02%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature (25°C) for 48 hours, there is no perceptible change in appearance and smell, and the performance indicators are all qualified.

[0014] The ESC working condition test was carried out on a diesel engine bench with a dis...

Embodiment 2

[0016] Select 28 parts of 75wt% urea solution, 24 parts of analytically pure ammonium formate, 14 parts of analytically pure propylene glycol, and 34 parts of high-purity water; stir at room temperature (28°C) until completely dissolved, and filter through a filter membrane with a pore size of 0.5 μm. It is the ultra-low temperature vehicle urea solution of the present invention. According to the measurement, the freezing point of the ultra-low temperature vehicle urea solution is -47°C, it is odorless, the appearance is clear and transparent, and the density is 1.091g / cm 3 , the content of biuret is 0.02%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature (28°C) for 48 hours, there is no perceptible change in appearance and smell, and the performance index tests are all qualified.

[0017] The ESC working condition test was carried out on a diesel engine bench with a di...

Embodiment 3

[0019] Select 30 parts of 75wt% urea solution, 21 parts of analytically pure ammonium formate, 13 parts of analytically pure propylene glycol, and 36 parts of high-purity water; stir at room temperature (23°C) until completely dissolved, and filter through a filter membrane with a pore size of 0.2 μm. It is the ultra-low temperature vehicle urea solution of the present invention. According to the measurement, the freezing point of the ultra-low temperature vehicle urea solution is -50°C, it is odorless, the appearance is clear and transparent, and the density is 1.090g / cm 3 , the content of biuret is 0.02%, the content of impurity elements meets the standard requirements, and the compatibility of plastics meets the requirements; after storage at room temperature (23°C) for 48 hours, there is no perceptible change in appearance and smell, and the performance index tests are all qualified.

[0020] The ESC working condition test was carried out on a diesel engine bench with a di...

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Abstract

The invention discloses an ultra-low temperature urea solution uses for a vehicle. The urea solution is prepared from the following raw materials by weight: 27 to 31 parts of a 75 wt% urea solution, 20 to 25 parts of ammonium formate, 10 to 15 parts of propylene glycol and 34 to 40 parts of high-purity water. The ultra-low temperature urea solution provided by the invention is simple in composition and convenient in preparation, has a freezing point lower than -45 DEG C, is applicable to northern cold areas in winter in and has high practical value.

Description

technical field [0001] The invention belongs to the technical field of automobile tail gas treatment solutions, and in particular relates to an ultra-low temperature automobile urea solution. Background technique [0002] With the continuous increase of the number of automobiles in our country, the harm of nitrogen oxides and particulate matter emitted by automobiles to human health and the atmospheric environment has attracted great attention. According to reports, all countries in the world are committed to reducing these two emissions. As far as my country is concerned, the "National IV" emission standard that has been implemented means that more advanced technologies must be used for vehicle exhaust emissions. A large number of experimental studies have shown that selective catalytic reduction technology (SCR) is the most suitable "National IV" emission solution for diesel vehicles, and this technology must use urea solution to reduce NO in exhaust gas. X Therefore, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/94B01D53/56
Inventor 汤广斌李丰登孙长城桑书梅邓欢李伟萍韩娟
Owner HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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