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Twin-turbo EGR system and method for ship two-stroke diesel engine

A diesel engine and turbine technology, applied in the field of diesel engine intake and exhaust treatment devices, can solve the problems of reducing the output power of the turbine and affecting the output power of the turbocharger, so as to reduce the maximum burst pressure, save the space of the ship, and stabilize the scavenging flow. Effect

Inactive Publication Date: 2016-07-20
HARBIN ENG UNIV
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Problems solved by technology

But this way of operation will directly affect the output power of the turbocharger
In this way, the exhaust gas flow through the turbocharger is reduced and the output power of the turbine is reduced accordingly

Method used

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  • Twin-turbo EGR system and method for ship two-stroke diesel engine

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Embodiment Construction

[0023] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0024] to combine figure 1 , the present invention is a marine two-stroke diesel engine twin-turbo EGR system, comprising an intake pipe, an exhaust pipe, a turbine, a compressor, a cooler, a scrubber and a water mist collector.

[0025] The EGR system includes a large turbine passage, an EGR passage and a small turbine passage. The large turbine passage is connected to the diesel engine through the exhaust manifold and the scavenging manifold; the EGR passage is connected to the diesel engine through the exhaust manifold and the scavenging manifold; the small turbine passage is It is connected with the diesel engine through the exhaust manifold and the scavenging manifold.

[0026] The passage of the large turbine includes the large turbine, the large compressor, the cooler, the mist collector A and the waste gas bypass circuit. The large turbine and compresso...

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Abstract

The invention aims at providing a twin-turbo EGR system and method for a ship two-stroke diesel engine. The twin-turbo EGR system comprises the diesel engine, an exhaust header, a scavenging header, a large turbocharger and a small turbocharger. The exhaust header communicates with an exhaust pipe of the diesel engine, and the scavenging header communicates with a gas inlet pipe of the diesel engine. A large turbine communicates with the exhaust header through a large turbine inlet pipeline. An outlet of the large turbine communicates with the air and meanwhile is connected with the large turbine inlet pipeline through a first bypass pipeline. A large gas compressor communicates with the scavenging header through a large gas compressor outlet pipeline. A small turbine communicates with the exhaust header through a small turbine inlet pipeline. A small gas compressor communicates with the scavenging header through a small gas compressor outlet pipeline. The small gas compressor outlet pipeline communicates with the exhaust header through a second bypass pipeline. Compared with an SCR system, a large quantity of reducing agent is saved, the output power of the large turbine cannot be influenced by switching the large turbine and the small turbine, and scavenging flow can keep stable to a certain degree.

Description

technical field [0001] The invention relates to a diesel engine intake and exhaust treatment device and method, in particular to a marine diesel engine intake and exhaust treatment device and method. Background technique [0002] Since IMO approved the Tier III NOx emission standards for large marine diesel engines in Emission Control Areas (ECAs), the global marine engine manufacturers are facing the challenge of how to reduce NOx emissions. The new IMONOx standard will be implemented on January 1, 2016, and NOx emissions will be reduced by 80% compared to the previous year. This emission reduction has exceeded the range of the combustion process capability of the two-stroke diesel engine. Additional measures are necessary to implement this emission reduction standard on two-stroke diesel engines. [0003] At present, commonly used NOx emission reduction measures mainly include in-machine emission reduction measures and out-of-machine emission reduction measures. The int...

Claims

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Application Information

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IPC IPC(8): F02M26/07F02M26/34F02M26/35F02M26/23F02B37/007F02B37/16
CPCF02B37/007F02B37/183Y02T10/12
Inventor 朱元清王占广周松周金喜高瑞锋
Owner HARBIN ENG UNIV
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