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marine diesel engine

A diesel engine and engine technology, applied in engine components, combustion engines, engine control, etc., can solve the problems of NOx reduction, difficult emission reduction, and difficulty in controlling the water addition rate, so as to reduce emissions and suppress fuel efficiency deterioration. Effect

Active Publication Date: 2022-07-08
JAPAN ENGINE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the prior art described above, it is difficult to reduce the NOx emission from the engine body to a level capable of satisfying the required NOx emission limit, and to efficiently control water technology and other technologies to suppress deterioration of engine fuel efficiency. NOx reduction technology
In particular, in the prior art described in Patent Document 1, the EGR rate sometimes becomes the same value even when the engine load changes in different states. In this case, the EGR rate and the water addition rate to the fuel are not The only definite and therefore difficult to control the water addition rate corresponding to the EGR rate in most cases
In addition, in the prior art described in Patent Documents 2 and 3, it is difficult to flexibly control the water addition rate to the combustion chamber in the cylinder according to the engine load.

Method used

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  • marine diesel engine
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Embodiment approach 1

[0036] The structure of the marine diesel engine which concerns on Embodiment 1 of this invention is demonstrated. figure 1 It is a schematic diagram which shows one structural example of the marine diesel engine which concerns on Embodiment 1 of this invention. like figure 1 As shown, the marine diesel engine 10 according to the first embodiment includes an engine main body 1 , an injection unit 5 for supplying fuel and water to the engine main body 1 , and a rotational speed detecting unit 9 for detecting the rotational speed of the engine main body 1 . . In addition, the marine diesel engine 10 includes a supercharger 11 , an EGR system 12 , a cooler 13 for cooling the compressed gas from the supercharger 11 , a check valve 14 , an auxiliary blower 15 , and an auxiliary blower 15 for detecting combustion. The oxygen concentration detection unit 16 , the operation unit 17 , and the control unit 18 for the oxygen concentration of the gas. In addition, if figure 1As shown,...

Embodiment approach 2

[0083]Next, Embodiment 2 of the present invention will be described. In the above-described first embodiment, the EGR operation (low-pressure EGR operation) is performed by extracting the recirculated gas from the exhaust gas whose pressure has decreased due to the rotation of the turbine 11b for the supercharger 11, but in the second embodiment , the EGR operation (high-pressure EGR operation) is performed by extracting the recirculated gas from the high-pressure exhaust gas before the turbine 11b is rotated.

[0084] image 3 It is a schematic diagram which shows one structural example of the marine diesel engine which concerns on Embodiment 2 of this invention. like image 3 As shown, the marine diesel engine 20 according to the second embodiment includes the EGR system 22 between the engine body 1 and the supercharger 11 in place of the EGR system 12 of the marine diesel engine 10 according to the first embodiment. The other structures are the same as those in Embodimen...

Embodiment approach 3

[0091] Next, Embodiment 3 of the present invention will be described. In Embodiment 1 described above, the combustion gas (specifically, fresh air or a mixed gas of fresh air and recirculated gas) is compressed by the one-stage supercharger (supercharger 11 ). In the third embodiment, the combustion gas is compressed by a two-stage supercharger.

[0092] Figure 4 It is a schematic diagram which shows one structural example of the marine diesel engine which concerns on Embodiment 3 of this invention. like Figure 4 As shown, the marine diesel engine 30 according to the third embodiment includes a two-stage supercharger 31 in place of the supercharger 11 of the marine diesel engine 10 according to the first embodiment. The other structures are the same as those in Embodiment 1, and the same symbols are attached to the same components.

[0093] The two-stage supercharger 31 is a supercharger for compressing combustion gas such as air in stages by using the exhaust gas from t...

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Abstract

One aspect of the marine diesel engine of the present invention includes an engine body that converts reciprocating motion of a piston caused by combustion of fuel in a cylinder into a rotational motion of a rotating shaft that generates propulsive force, and an injection portion that A fuel and water are injected into a combustion chamber in a cylinder; a NOx reduction device that reduces nitrogen oxides in exhaust gas discharged from the engine body; and a control unit. During the operation of the injection unit, the control unit variably controls the water addition rate of the injection unit according to the engine load, which is the load of the engine main body, and during the operation of the NOx reduction device, the control unit variably controls the display by the engine load. A reduction parameter for the degree of NOx reduction performed by the NOx reduction device.

Description

technical field [0001] The present invention relates to a marine diesel engine mounted on a ship. Background technique [0002] Conventionally, in the field of ships, water technology is known as one of the methods for reducing nitrogen oxides (NOx) in exhaust gas discharged from the engine main body of a marine diesel engine. This water technology adds water to the combustion chamber in the cylinder of the engine body, thereby lowering the combustion temperature and reducing the amount of NOx emissions. As such a water technology, for example, a technology of introducing a water-emulsion fuel obtained by mixing water with a fuel and emulsified into a combustion chamber, a technology of injecting water alone into a flame generated in the combustion chamber after fuel injection, and the like are mentioned. [0003] In addition, as another method for reducing NOx in the exhaust gas from the engine main body, two NOx reduction technologies, an exhaust gas recirculation (EGR: E...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D19/12F01N3/08F01N3/24F02D21/08F02D43/00F02D45/00F02M25/025F02M25/03F02M26/06F02M26/08
CPCF01N3/08F01N3/24F02D19/12F02D21/08F02D43/00F02D45/00F02M25/025F02M25/03F02M26/06F02M26/08Y02T10/12F02D41/0025F02M25/0225F02D41/0235F02D41/0072F01N3/2066F01N2610/146
Inventor 平冈直大三柳晃洋辻阳平樋口纯伊藤和久
Owner JAPAN ENGINE CORP
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