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Marine scr system

A technology for SCR systems and ships, applied in exhaust gas treatment, nitrous oxide capture, climate sustainability, etc., can solve problems such as difficult to effectively reduce NOx emissions

Active Publication Date: 2021-05-18
JAPAN ENGINE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the SCR system for ships is too large for use in order to meet the second-level regulations. For example, compared with the second-level regulations, excessively reducing the emission of NOx is wasteful, and it may be difficult to effectively reduce the emission of NOx.

Method used

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  • Marine scr system
  • Marine scr system
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0080]The structure of the SCR system of the first embodiment of the present invention will be described.figure 1 A schematic illustration of a configuration example of a SCR system of the first embodiment of the present invention. The SCR system 10 for the ship of the first embodiment is used to reduce NOx from the exhaust gas of the ship's diesel engine 100 mounted in the ship, andfigure 1 As shown, there is a small injection nozzle 1, a large injection nozzle 2, an exhaust gas flow system 3, a reducing agent supply system 4, a compressed air supply system 5, an SCR reactor 6, an operation portion 8, and a control unit 9.

[0081]In addition,figure 1 The pipes of fluids such as exhaust gas or reducing agents are illustrated by a solid arrow. The electrical signal line is illustrated by a single point scrib. This is also the same in other drawings. Further, the so-called exhaust gas, except for the particular description, refers to the exhaust gas discharged from the ship's diesel eng...

Embodiment approach 2

[0130]Next, embodiment 2 of the present invention will be described. In the above-described first embodiment, the exhaust gas being sprayed with the reducing agent from the first stage to the final stage is contacted from the first stage to the final stage, regardless of the low denitrite SCR operation mode and the high-denitration SCR operation mode. However, in the present embodiment, in the case of a low denitration SCR operation mode, a catalyst layer that is in contact with the exhaust gas that is sprayed after the reducing agent can be selected from the catalyst layer after the second stage.

[0131]image 3 It is a schematic diagram showing an example of a configuration example of a ship for a ship in the second embodiment of the present invention. Such asimage 3 As shown, the ship of the second embodiment includes the introduction tube 21 with the introduction tube 11b of the SCR system 10 of the first embodiment, instead of the exhaust gas flow system 3, instead of the control ...

Embodiment approach 3

[0161]Next, embodiment 3 of the present invention will be described. In the above-described second embodiment, the small injection nozzle 1 and the large injection nozzle 2 are disposed in a separate mixer 3a, but in the third embodiment, the small injection nozzle 1 and the large injection nozzle 2 are disposed in each different In the mixer.

[0162]Figure 5 An example of a configuration example of a SCR system for a ship in the third embodiment of the present invention is shown. Such asFigure 5 As shown, the ship of the third embodiment includes the introduction tube 31 with the introduction tube 21 of the SCR system 20 of the second embodiment of the second embodiment, instead of the exhaust gas flow system 23, instead of the control unit 29 is provided with a control unit 39. The other structure is the same as that of the second embodiment, and the same components are denoted by the same symbols.

[0163]The introduction tube 31 is a pipe for introducing exhaust gas to the SCR reacto...

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Abstract

A marine SCR system according to an aspect of the present invention is provided with: a first spray nozzle through which a reducing agent for reducing NOx is sprayed to an exhaust gas; a second spray nozzle through which a reducing agent much greater in amount than that from the first spray nozzle is sprayed to the exhaust gas; a reducing agent supply system that supplies the reducing agent to one of the spray nozzles; a reactor that has a catalyst layer for causing reduction reaction of NOx in the exhaust gas; an operation unit instructing, in a switchable manner, a first operation mode for reducing the NOx emission to a regulation value or lower and a second operation mode for reducing the NOx emission so as to be not more than a lower regulation value; and a control unit that controls the reducing agent supply system so as to supply the reducing agent at a first flowrate to the first spray nozzle when in the first operation mode, and supply the reducing agent at a higher second flowrate to the second spray nozzle when in the second operation mode.

Description

Technical field[0001]The present invention relates to a selection catalyst reduction (SCR: SelectiveCatalytic reduction) system disposed for a ship's diesel engine, that is, a SCR system for a ship.Background technique[0002]Conventionally, in the field of diesel engines with ships, a nitrititate (NOx) of nitrogen oxide (NOx) in the exhaust gas discharged from the ship is reduced, and there is a SCR system for ships (see, for example, Patent Document 1, 2). Generally, the ship is mixed with a reducing agent having an NOx reduction with a reducing agent of the NOx reduction with the exhaust gas from the ship to reduce the amount of NOx in the exhaust gas.[0003]In addition, according to the marine pollution of the international maritime institution, the Appendix VI of the Treaty is prevented from the exhaust gas required by the ship's diesel engine requirements (level I), the secondary provision (level II), and the three-level provisions (level III). The first-level provisions and seco...

Claims

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Application Information

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IPC IPC(8): F01N3/08B01D53/94
CPCB01D53/94F01N3/08Y02T10/12Y02C20/10F01N3/2066B01D53/9427F01N2590/02F01N2570/14F01N2610/146F01N2550/14
Inventor 中川贵裕伊藤和久
Owner JAPAN ENGINE CORP