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A kind of exhaust gas pretreatment system for diesel engine

A pretreatment, diesel engine technology, applied in the direction of charging system, exhaust gas recirculation, mechanical equipment, etc., can solve the problems of increased complexity of post-exhaust pretreatment system, unfavorable application and promotion of marine diesel engine products, etc., to achieve the effect of cyclone separation Good, improve the cyclone separation effect, the effect of strong cyclone ability

Active Publication Date: 2016-04-13
中国船舶集团有限公司第七一一研究所
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Problems solved by technology

[0006] In addition, the combination of DOC and POC will greatly increase the complexity of the exhaust gas pretreatment system, which is not conducive to its application and promotion in marine diesel engine products

Method used

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  • A kind of exhaust gas pretreatment system for diesel engine

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Embodiment Construction

[0035] like figure 1 As shown, in one embodiment, an exhaust gas pretreatment system for a diesel engine is provided with a humidifier 1 , a cyclone separator 2 , a Laval nozzle 3 and a diffuser 4 in sequence along the exhaust gas flow. The cyclone separator 2, the Laval nozzle 3 and the diffuser 4 are coaxial; the cyclone 2, the Laval nozzle 3 and the diffuser 4 are provided with a center body 5 inside. The central body 5 sequentially includes a semi-ellipsoid section, a constricted section, a straight section, a first expanding section and a second expanding section along the flow direction of the exhaust gas.

[0036] Wherein, the direction of the arrow in the figure indicates the flow direction of exhaust gas in the exhaust gas pretreatment system for diesel engine of this embodiment.

[0037] The humidifying device 1 communicates with the cyclone separator 2 through a pipeline 6 . The humidifying device 1 adopts micro mist humidification or ultrasonic humidification. W...

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Abstract

The invention discloses an exhaust gas pretreatment system for a diesel engine. A humidifying device, a cyclone separator, a Laval nozzle and a diffuser pipe are sequentially arranged in the flowing direction of exhaust gas, wherein a central body is arranged inside the cyclone separator, the Laval nozzle and the diffuser pipe; a flowing passage of the exhaust gas is formed inside space between the tube wall of the cyclone separator, the Laval nozzle and the diffuser pipe, and the central body; screw blades are arranged inside the cyclone separator through a semi-ellipsoidal section of the central body; the screw blades are designed in an unequal-screw pitch method according to a spiral line; a first particulate matter outlet is formed in a throat of the Laval nozzle and is used for discharging sulfide and particulate matters during separation of the exhaust gas. The exhaust gas pretreatment system for the diesel engine is simple in structure and low in manufacturing and using cost, can provide the purified exhaust gas for the diesel engine without adding too much equipment, and can reduce sulfur emission, so that a stricter emission requirement can be met.

Description

technical field [0001] The invention relates to the technical field of exhaust gas pretreatment of diesel engines, in particular to an exhaust gas pretreatment system for diesel engines. Background technique [0002] Exhaust gas recirculation technology (EGR for short) is currently a major technology for diesel engines to reduce exhaust emissions. In order to realize the exhaust gas recirculation technology, the exhaust gas from the diesel engine needs to be introduced into the intake pipe to achieve the purpose of reducing the emission of nitrogen oxides. Because the sulfur content in the fuel used by diesel engines (especially marine diesel engines) is too high (generally above 1000ppm), the content of particulate matter and sulfur compounds in the exhaust gas of diesel engines is too high. Therefore, when exhaust gas recirculation technology is used, exhaust gas recirculation will be brought Corrosion and clogging of key components of the system (EGR pump, EGR valve, EGR...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M26/35
CPCY02T10/12
Inventor 张文正何郭靖陈志忠
Owner 中国船舶集团有限公司第七一一研究所
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