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SCR system having bypass system

A catalyst and bypass pipeline technology, applied in the field of SCR system, can solve the problems of reducing the available space of the ship, difficult to repair or replace abnormal parts, and increasing the installation cost of the SCR system and the management cost.

Inactive Publication Date: 2014-05-14
光星(株)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Reheat system and / or dust collectors increase the overall size of the SCR system
Therefore, it is disadvantageous to place a conventional SCR system on a relatively narrow vessel, since the available space of the vessel is further reduced
In addition, the SCR system must be designed considering the conditions of the ship on which the SCR system is provided, but providing a reheat system and / or a dust collector can make it difficult to obtain an overall design of the SCR system, which must be considered in consideration of the conditions of the ship conduct
Additionally, the reheat system and / or dust collectors add significantly to the installation and management costs of the SCR system
[0007] In addition, since conventional SCR systems are supplied such as urea or NH 3 The reducing agent needs to use high-pressure air when entering the SCR reactor, so conventional SCR systems require complex piping or installation to guide high-pressure air to the pipeline supplying reducing agent and use compressors
In addition, conventional SCR systems supply urea or NH at high purity 3 limited to SCR reactors
[0008] In particular, since a conventional SCR system for a ship cannot stop the operation of an exhaust gas source such as a boiler or an engine in an abnormal or emergency state, it is impossible or difficult to repair or replace an abnormal part, a broken part, or a non-operating part without stopping Operation of exhaust sources

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0025] figure 1 is a diagram of an SCR system for a ship according to a first embodiment of the present disclosure. Here, the term "vessel" refers not only to a typical boat with a propulsion engine but to any offshore floating structure.

[0026] refer to figure 1 , The SCR system of this embodiment includes an SCR reactor 2 connected to the exhaust gas source 1 at its front end. Exhaust gas source 1 may include engines used for propulsion or other purposes in ships, boilers in LNG transporters, and other types of devices that emit exhaust gases through combustion in ships. The SCR reactor 2 includes a catalyst for reducing NOx in exhaust gas by selective catalyst reduction. In the housing of the SCR reactor 2, NOx is reduced to nitrogen by reaction with a reducing agent in the presence of a catalyst.

[0027] The SCR system for ships according to the present embodiment is not provided with a reheating system for heating exhaust gas, which is generally provided at the fro...

no. 2 approach

[0035] Second Embodiment: Single Air Line

[0036] figure 2 is a diagram of an SCR system for a ship according to a second embodiment.

[0037] refer to figure 2 , the SCR system of this embodiment includes a supply for NH 3 / urea to the reductant supply line 4 of the SCR reactor 2. The reducing agent supply line 4 extends to the nozzle 12 located at the front end of the SCR reactor 2 instead of being connected to the air line 3 as in the above embodiment. Since the reducing agent supply line 4 directly supplies NH using a supply device such as a pump or the like incorporated into the reducing agent supply line 4 itself 3 / urea to the nozzle 12 located at the front end of the SCR reactor 2, thus simplifying the piping structure of the system and being able to use higher purity NH 3 Or urea reduction of NOx is possible. For this purpose, the SCR system can include NH for the control pump or in the control line connected to the pump 3 or urea flux devices. In this str...

no. 3 approach

[0038] Third Embodiment: Anti-vibration device for anti-earthquake / isolation / vibration control

[0039] image 3 is a diagram of an SCR system for a ship according to a third embodiment.

[0040] refer to image 3 , the SCR system of the present embodiment includes a vibration-proof device for earthquake-proof / vibration-isolation / vibration-control in the SCR reactor 2 . Since the ship moves under its own power or is moved by waves while at sea, the ship is subjected to severe vibrations and large loads. Therefore, the SCR system of the present embodiment includes the anti-vibration device 14 in the SCR reactor 2 . Here, the anti-vibration device 14 may have a suspension structure, but is not limited thereto. In addition, each pipe provided at the front end and the rear end of the SCR reactor 2 has a flexible connection structure to ensure good operation of the anti-vibration device 14 relative to the SCR reactor 2 . In this embodiment, flexible joints 13 are used for pipi...

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Abstract

Disclosed herein is an SCR system of a vessel for discharging exhaust gas from an exhaust gas source in the vessel to an outside after performing purification of the exhaust gas. The SCR system includes an SCR reactor connected at a leading end thereof to the exhaust gas source and including a catalyst activated by the exhaust gas introduced into the SCR reactor, a reducing agent supply line supplying NH 3 or urea into the SCR reactor, and a bypass system forcing the exhaust gas discharged from the exhaust gas source to bypass the SCR reactor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2009-0088727 filed with the Korean Patent Office on September 18, 2009 under 35 U.S.A. §119, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a selective catalyst reduction (SCR) system for reducing nitrogen oxides (NOx) in exhaust gas, and more particularly, to an SCR system for purifying exhaust gas discharged from a ship. The invention is applicable to any kind of vessel and has been developed to meet various regulations. Background technique [0004] SCR systems are used to reduce nitrogen oxides (NOx) in exhaust gases generated during ship operation. For example, SCRs are provided for the purpose of reducing nitrogen oxides discharged from marine engines or boilers of LNG carriers. The SCR system is based on a selective catalyst reduction method and is configured to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28F01N3/20B01D53/94B01D53/56
CPCB01D2259/4566B01D53/8631F01N3/2053F01N2240/20F01N3/2066F01N2590/02F01N2013/026B01D2251/2062F01N2610/08F01N2610/02Y02T10/24F23J15/02F01N3/32B01D2251/2067F01N2410/00B01D53/9431F23J2219/10F01N3/30F01N13/0097Y02T10/12B01D53/58B01D53/94F01N3/20F01N3/28
Inventor 黄桂胤黄星喆
Owner 光星(株)