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S-CO2 cycle waste-heat utilizing system for EGR cooler of marine low-speed diesel engine

An EGR cooler, S-CO2 technology, applied in the direction of charging system, exhaust gas recirculation, machine/engine, etc., can solve the problems of diesel engine economical deterioration, fuel consumption increase, diesel engine combustion deterioration, etc., to achieve compact structure, The effect of solving energy consumption and reducing NOx emissions

Inactive Publication Date: 2017-03-15
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology reintroduces the exhaust gas emitted by the ship's low-speed diesel engine into the cylinder for combustion, resulting in poor combustion of the diesel engine and increased fuel consumption.
Studies have shown that when the EGR rate of a marine low-speed diesel engine is 27%, it can make the marine low-speed diesel engine meet Tier III emission standards, but the fuel consumption will increase by 4g / kWh, which will make the diesel engine's economy worse

Method used

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  • S-CO2 cycle waste-heat utilizing system for EGR cooler of marine low-speed diesel engine

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Embodiment Construction

[0012] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0013] to combine figure 1 , the present invention consists of S-CO 2 circuit and EGR circuit. where S-CO 2 The circuit is composed of working medium side 1 of EGR cooler, expander 2, high temperature side of regenerator 3, working medium side of cooler 4, compressor 5, and low temperature side of regenerator 3, connected in sequence. where S-CO 2 The circuit also includes a generator 6 coaxially connected with the expander 2 and a cooling water pump 7 providing cooling water for the cooler 4 . The EGR circuit is composed of an exhaust header 8, a main flue gas pipe 9, a flue gas side of an EGR cooler 1, a main EGR device 11 and an intake header 12 connected in sequence. Wherein the EGR circuit also includes a flue gas bypass pipe 10 for bypassing.

[0014] The exhaust gas discharged from the marine diesel engine exhaust header 8 first enters the EGR cooler ...

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Abstract

The invention aims to provide an S-CO2 cycle waste-heat utilizing system for an EGR cooler of a marine low-speed diesel engine. The S-CO2 cycle waste-heat utilizing system is characterized in that a supercritical CO2 Brayton cycle of an S-CO2 loop absorbs the energy of exhaust in the EGR cooler, and reduces the temperature of the exhaust to a temperature above an exhaust acid-dew-point or cools the exhaust to a temperature below the acid dew point through a corrosion-resistant material; high-temperature high-pressure supercritical CO2 gas discharged form a working medium side of the EGR cooler enters an expansion machine to do work, and electricity is generated through a shaft generator; S-CO2 discharged from the expansion machine enters a heat regenerator to preheat S-CO2 on the low-temperature side of the regenerator, and then enters a cooler to be cooled; and S-CO2 discharged from the cooler enters a compressor to be compressed to be pressurized, is preheated through the heat regenerator and then enters the EGR cooler to perform heating to finish a whole cycle. The S-CO2 cycle waste-heat utilizing system provided by the invention effectively recycles the energy of high-temperature flue gas in the EGR cooler of the marine low-speed diesel engine, and relieves the problem that the oil consumption is increased because the marine low-speed diesel engine adopts an EGR technology.

Description

technical field [0001] The invention relates to a waste heat recovery system, in particular to a ship diesel engine waste heat recovery system. Background technique [0002] The application of EGR technology can effectively solve the NOx emission problem of marine low-speed diesel engines, so that ships can meet the requirements of TierIII emission regulations. However, this technology reintroduces the exhaust gas emitted by the ship's low-speed diesel engine into the cylinder for combustion, resulting in poor combustion of the diesel engine and increased fuel consumption. Studies have shown that when the EGR rate of a marine low-speed diesel engine is 27%, the marine low-speed diesel engine can meet Tier III emission standards, but the fuel consumption will increase by 4g / kWh, which will make the diesel engine's economy worse. Combining EGR technology and S-CO 2 The combination of technologies can effectively solve the two major problems of marine low-speed diesel engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/27F02M26/37F02G5/02
CPCF02G5/02F02G2250/03Y02T10/12
Inventor 张文平禇阵豪张新玉明平剑柳贡民曹贻鹏国杰赵晓臣
Owner HARBIN ENG UNIV
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