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Exhaust gas purification system for engine

An exhaust gas purification device and engine technology, which is applied to exhaust devices, engine components, combustion engines, etc., can solve the problem of easy retention of reducing agent, and achieve the effect of preventing accumulation and inhibiting precipitation

Active Publication Date: 2010-08-25
VOLVO LASTVAGNAR AB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the joint is arranged at the lower part of the exhaust gas passage without paying special attention to the joint, the reducing agent sprayed by the nozzle may easily stay on the weld seam, and the reducing agent component is precipitated on the weld seam due to the heat of the exhaust gas, thereby accumulating. in the exhaust passage

Method used

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  • Exhaust gas purification system for engine
  • Exhaust gas purification system for engine
  • Exhaust gas purification system for engine

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Embodiment Construction

[0019] Embodiments of the present invention will be described below with reference to the drawings.

[0020] FIG. 1 shows the overall structure of an exhaust gas purification device for an engine 1 according to a first embodiment of the present invention.

[0021] The engine 1 of this embodiment is a diesel engine, and constitutes a driving source of a large vehicle such as a truck. The exhaust gas passage of the engine 1 is provided with a reduction catalyst 3, and the reduction catalyst 3 promotes a reduction reaction of NOx by a reducing agent described later. The exhaust gas passage upstream of the reduction catalyst 3 is divided into an upstream exhaust gas pipe 21 and a downstream exhaust gas pipe 22, and these exhaust gas pipes 21 and 22 are connected by a flange (symbol 221 in FIG. 1 indicates the flange of the downstream exhaust gas pipe 22). The downstream side exhaust gas pipe 22 constitutes the "flow path member" of the present embodiment, and is connected to the ...

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Abstract

A reduction catalyst is placed in an exhaust passage of an engine, and a reducing agent added to an exhaust gas and NOx in the exhaust gas are reacted on the catalyst. A member for passing the exhaust gas added with the reducing agent is provided, and this member is formed by welding in the axial direction. This member is arranged so that the inner surface of the welded portion overhangs in the exhaust passage.

Description

technical field [0001] The present invention relates to an exhaust gas purification device for an engine, and more specifically, relates to a technique for preventing accumulation of reducing agent components in an exhaust gas passage in an apparatus for purifying exhaust gas by adding a NOx reducing agent. Background technique [0002] As an apparatus for purifying nitrogen oxides (hereinafter referred to as “NOx”) contained in engine exhaust gas, the following apparatus using a NOx reducing agent is known. That is, a reduction catalyst is provided in an exhaust gas passage of an engine, and a reducing agent such as an aqueous urea solution is injected through a nozzle provided upstream of the reduction catalyst (Patent Document 1). The NOx in the exhaust gas and the injected reducing agent undergo a reduction reaction on the reduction catalyst to purify the NOx into harmless components. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2000-027627 [0004] In suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/08B01D53/86B01D53/94F01N3/24F01N7/08F01N13/08
CPCF01N13/08F01N2470/06F01N1/084F01N2013/026F01N1/083F01N3/106B01D53/9431F01N2610/14B01D53/90F01N2450/22F01N2610/08Y02T10/24F01N3/206B01D2251/206F01N2230/04F01N3/2066F01N2240/20F01N2470/02F01N2610/02F01N13/0097Y02T10/12
Inventor 本多幸太郎内藤雄史金谷勇白井大辅平本均山田尚史
Owner VOLVO LASTVAGNAR AB