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Urea crystallization amount estimation, crystalline state judging and crystal eliminating method

A technology of crystallization state and crystallization amount, applied in the field of SCR exhaust after-treatment and engine, it can solve the problems of inability to prevent and eliminate urea crystallization, worse emission, exhaust pipe corrosion, etc.

Active Publication Date: 2017-06-13
WEICHAI POWER CO LTD
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Problems solved by technology

However, after the design of the mixer is finalized, it is impossible to prevent and eliminate urea crystallization according to the operating conditions of the engine, resulting in poor emission after crystallization, and serious corrosion of the exhaust pipe

Method used

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  • Urea crystallization amount estimation, crystalline state judging and crystal eliminating method
  • Urea crystallization amount estimation, crystalline state judging and crystal eliminating method
  • Urea crystallization amount estimation, crystalline state judging and crystal eliminating method

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Embodiment Construction

[0027] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0028] figure 1 It shows the urea crystallization equilibrium line obtained based on the engine exhaust flow and exhaust temperature when the engine and after-treatment hardware are determined. This urea crystallization equilibrium line is called a critical line. Above the critical line, the crystallization rate can be neglected; in area 1, the crystallization rate is positive, and the lower the temperature, the lower the exhaust ...

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Abstract

The invention provides a urea crystallization amount estimation, crystalline state judging and crystal eliminating method. Based on the engine running working conditions, influences of the urea crystallization speed and the SCR conversion efficiency on urea crystallization are estimated under the current working condition. When the urea crystallization amount is too much, the engine running state is adjusted, crystals are removed in time, and the stone forming phenomenon is prevented.

Description

technical field [0001] The invention relates to the field of engines, in particular to the technical field of SCR exhaust gas post-treatment. Background technique [0002] Urea selective catalytic reduction (selective catalytic reducton, SCR) technology is one of the most commonly used technical means to control diesel engine nitrogen oxide (NOx) emissions. However, in the process of actual use, due to the problem of urea crystallization, for example, when the urea injection amount is not appropriate or the mixer structure is too simple, the urea distribution uniformity is too poor, which will lead to lumps on the SCR box or the urea nozzle. Or powdery urea nodules have an adverse effect on the SCR control of nitrogen oxides, resulting in incomplete tail gas reaction, resulting in excessive emissions. The prior art is based on the design of mixer hardware to prevent crystallization. However, after the design of the mixer is finalized, it is impossible to prevent and elimin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N9/00F01N11/00F01N2610/02F01N2900/0412F01N2900/0601F01N2900/1404F01N2900/1411F01N2900/1806Y02T10/40
Inventor 张振涛王晓华张军张瑜曹庆和
Owner WEICHAI POWER CO LTD
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