Vessel two-stroke diesel engine exhaust gas recirculation system and control method

A recirculation system, diesel engine technology, applied in exhaust gas recirculation, engine control, charging system, etc., can solve problems such as increasing compressor wear, increase life, save ship space, economy and efficiency will not be reduced Effect

Inactive Publication Date: 2015-03-11
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The EGR system is aimed at four-stroke diesel engines for vehicles. For marine two-stroke diesel engines, since low-quality heavy oil is used, there are far more particles in the exhaust gas than four-stroke diesel engines that use light oil,

Method used

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  • Vessel two-stroke diesel engine exhaust gas recirculation system and control method

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Embodiment Construction

[0039] The present invention will be described in more detail below with examples in conjunction with the accompanying drawings.

[0040] The EGR system of the present invention is suitable for a marine two-stroke diesel engine system, which has: an engine 1, an exhaust manifold 3 connected to the engine 1 through an exhaust pipe 2, an air intercooler arranged on the intake passage B 8 and water droplet catcher 9, connected to the turbine 4 of the exhaust manifold 3 and the compressor 6 arranged on the intake passage B; the intake passage B communicates with the outlet of the compressor 6 and the scavenging air box 17, including air intercooling device 8 and water drop catcher 9; the waste gas bypass passage C containing the one-way stop valve 5 is directly connected to the inlet of the turbine 4 and the ambient atmosphere; the compressed air bypass passage D containing the one-way stop valve 7 is directly connected to the outlet of the compressor 6 and Turbo 4 inlet.

[0041...

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Abstract

The invention provides a vessel two-stroke diesel engine exhaust gas recirculation system and a control method. A work mode is a non-EGR (exhaust gas recirculation) mode and an EGR mode; when the vessel sails in a non-exhaust control region, the diesel engine works under the non-EGR mode, the exhaust gas exhausted from an exhaust manifold drives turbines to apply work so as to drive a gas compressor to compress air; the pressurized fresh air is cooled and dehumidified and then enters into the engine from a scavenging air receiver to participate in burning; when the vessel sails in an exhaust control region, the diesel engine works under the EGR mode, part of waste gas is led from the exhaust manifold and then flows to a one-way stop valve , then the waste gas is cooled and washed, so that the temperature is reduced, and the particles and SOx are removed; then, the exhaust gas is pressurized by an EGR fan and humidified by a drop catcher to mix with fresh air from the gas compressor in the scavenging air receiver, and then enters into an air cylinder to participate in burning; the NOx generation and exhaust amount of the engine are reduced, the Tier III standard related to NOx exhaust of IMO (International Meteorological Organization) can be satisfied.

Description

technical field [0001] The invention relates to a device for controlling discharge of exhaust gas pollutants from ships, and also relates to a control method for the device for controlling discharge of exhaust gas pollutants from ships. Specifically, it is a NOx emission control technology for a ship's two-stroke diesel engine to meet the regulations of the International Maritime Organization (IMO) on the discharge of ship's exhaust pollutants. Background technique [0002] With the development of the international shipping industry, exhaust emissions from ships have become the main source of air pollution in coastal areas, especially in ports. Among the gaseous emissions produced by marine two-stroke diesel engines, NOx accounts for a large proportion, and it is easy to form acid rain, acid fog and photochemical smog, and is one of the main acid gases that cause air pollution. [0003] IMO has imposed strict restrictions on NOx emissions from marine diesel engine exhaust. ...

Claims

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Application Information

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IPC IPC(8): F02M25/07F02D21/08F02M26/21F02M26/23F02M26/35
CPCY02T10/12
Inventor 周松周金喜张贺付杨军刘佃涛
Owner HARBIN ENG UNIV
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