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Device and method for keeping injection pressure of SCR system of diesel engine constant

A technology of SCR system and injection pressure, which is applied in the direction of muffler, exhaust device, mechanical equipment, etc., to achieve the effect of weakening pressure fluctuation, preventing heating and prolonging service life

Inactive Publication Date: 2010-12-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the implementation of more and more stringent emission regulations, it is difficult to meet the requirements of diesel engine purification alone.

Method used

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  • Device and method for keeping injection pressure of SCR system of diesel engine constant
  • Device and method for keeping injection pressure of SCR system of diesel engine constant
  • Device and method for keeping injection pressure of SCR system of diesel engine constant

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Embodiment Construction

[0019] The diesel engine SCR system process with urea solution pressure regulator is as follows: figure 1 shown. The urea solution flows out from the urea tank, and is delivered to the urea solution pressure stabilizing pipe 6 after the pressure of the urea pump. The urea solution pressure regulator pipe 6 is connected to the urea solution pressure regulator 5. When the exhaust pressure of the diesel engine changes, the exhaust pressure is transmitted to the urea solution pressure regulator 5 through the air intake hose 2. After the urea solution pressure regulator 5 is adjusted, the difference between the absolute pressure of the urea solution in the urea regulator tube 6 of the SCR system and the exhaust pressure of the exhaust pipe at the nozzle of the urea solution is always a constant value. Excess urea solution is discharged through the liquid return port 20 of the urea solution pressure regulator and returned to the urea pump. Finally, the urea solution with constant ...

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Abstract

The invention relates to the technical field of diesel engine exhaust treatment, in particular to a device and a method for keeping the injection pressure of an SCR system of a diesel engine constant. The invention is characterized in that the SCR system of the diesel engine has a set of urea solution pressure regulation device. In the regulation device, a urea solution pressure regulator regulates to pressure of urea solution in a urea solution chamber according to the change of the exhaust pressure of the diesel engine, a urea solution pressure stabilizing pipe is communicated with the urea solution chamber; and finally, the difference between the absolute pressure of the urea solution in the urea solution pressure stabilizing pipe and the exhaust pressure in an exhaust pipe at the injection opening of an injector is kept constant all the time. The equipment has the characteristics of accurate control over SCR reducer injection volume of the diesel engine and long service life.

Description

technical field [0001] The invention relates to a diesel engine exhaust gas treatment system, which belongs to the technical field of diesel engine engineering, and relates to a method and equipment for maintaining stable injection pressure of a reducing agent in an SCR system of a diesel engine. Background technique [0002] With the development of the economy, the number of motor vehicles in my country is increasing day by day. Nitrogen oxides (NO x ), carbon monoxide (CO) and particulates (PM) are the three main pollutants in diesel engine exhaust emissions. National emission regulations are increasingly regulating these emissions in order to protect human health and the natural environment. With the implementation of more and more stringent emission regulations, it is difficult to meet the requirements of diesel engine purification alone. In order to meet emission regulations, diesel aftertreatment systems become essential. SCR (Selective catalytic reduction) exhaust...

Claims

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Application Information

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IPC IPC(8): F01N3/20F01N3/24
CPCY02T10/24Y02T10/12
Inventor 王谦涂方印
Owner JIANGSU UNIV