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SCR mixer and engine with same

A mixer and engine technology, applied in the direction of machines/engines, engine components, combustion engines, etc., can solve the problems of high back pressure of after-treatment SCR mixer and limited mixing effect of urea and exhaust gas, so as to increase the hydrolysis capacity of urea and improve Ammonia uniformity, effect of reducing back pressure

Active Publication Date: 2021-09-21
WEICHAI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to at least solve the problem of relatively large back pressure of the after-treatment SCR mixer of construction machinery in the prior art and the limited effect of mixing urea and exhaust gas. This purpose is achieved through the following technical solutions:

Method used

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  • SCR mixer and engine with same
  • SCR mixer and engine with same
  • SCR mixer and engine with same

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Embodiment Construction

[0026] 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.

[0027] It should be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "" are meant to include the plural forms as well, unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated f...

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Abstract

The invention belongs to the technical field of engines, and particularly relates to an SCR mixer and an engine. The SCR mixer is installed in a connecting cavity of an engine post-treatment device and comprises a rotational flow pipe and a rotational flow mixing bottom bowl, the rotational flow pipe comprises a rotational flow pipe body, the rotational flow pipe body is matched with the connecting cavity in shape, one end of the rotational flow pipe body is used for receiving urea, a plurality of first rotational flow holes are formed in the rotational flow pipe body, the rotational flow pipe body further comprises first flow deflectors arranged on the first rotational flow holes, the rotational flow mixing bottom bowl is connected with the second end of the rotational flow pipe body, a plurality of second rotational flow holes are formed in the rotational flow mixing bottom bowl, and the rotational flow mixing bottom bowl further comprises second flow deflectors arranged on the second rotational flow holes. The shape of the radial section of the rotational flow pipe body is similar to that of the radial section of the connecting cavity of the post-treatment device, the gas flow area can be increased, the back pressure can be reduced, the rotational flow mixing bottom bowl is arranged at the bottom of the rotational flow pipe, secondary mixing is increased, the ammonia uniformity is improved, the urea hydrolysis capacity is improved, and urea crystallization is avoided.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an SCR mixer and an engine. Background technique [0002] This section provides background information related to the present disclosure only and is not necessarily prior art. [0003] The existing SCR intake mixing structure is composed of a swirl tube, a porous tube, etc.; urea and exhaust gas are first mixed through the swirl tube, then mixed and evaporated through the double-layer tube, and then enter the SCR catalyst. The swirl tube of this scheme adopts a circular cross section, the air flow section is small, and the post-treatment back pressure is relatively large. Moreover, this scheme has a limited degree of mixing of urea and exhaust gas, and the uniformity of ammonia distribution is slightly low, resulting in a slightly larger NOx emission value. Contents of the invention [0004] The purpose of the present invention is to at least solve the problem of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/20
CPCF01N3/2892F01N3/2066Y02T10/12
Inventor 刘兴龙刘伟达李俊普张言库高伟闫娟
Owner WEICHAI POWER CO LTD
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