KR101864749B1 - Exhaust Gas Denitrifying System of Ship - Google Patents

Exhaust Gas Denitrifying System of Ship Download PDF

Info

Publication number
KR101864749B1
KR101864749B1 KR1020160180422A KR20160180422A KR101864749B1 KR 101864749 B1 KR101864749 B1 KR 101864749B1 KR 1020160180422 A KR1020160180422 A KR 1020160180422A KR 20160180422 A KR20160180422 A KR 20160180422A KR 101864749 B1 KR101864749 B1 KR 101864749B1
Authority
KR
South Korea
Prior art keywords
compressed air
reducing agent
heating
present
catalyst
Prior art date
Application number
KR1020160180422A
Other languages
Korean (ko)
Inventor
이수태
이수규
육근재
진성재
서문혁
최용기
황선엽
정경철
천상규
Original Assignee
주식회사 파나시아
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 파나시아 filed Critical 주식회사 파나시아
Priority to KR1020160180422A priority Critical patent/KR101864749B1/en
Priority to PCT/KR2017/008532 priority patent/WO2018124418A1/en
Application granted granted Critical
Publication of KR101864749B1 publication Critical patent/KR101864749B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/20—Vanadium, niobium or tantalum
    • B01J23/22—Vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/30—Tungsten
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

According to an embodiment of the present invention, a marine flue gas NO x removal system of the present invention includes a discharge pipe through which exhaust gas containing nitrogen oxides generated in an engine of a ship is discharged, a reducing agent injection unit for injecting a reducing agent into the discharge pipe And a reaction unit for inducing a reduction reaction of the exhaust gas mixed with the reducing agent to decompose the nitrogen oxides in the exhaust gas into nitrogen and water vapor, thereby reducing nitrogen oxides.

Description

{Exhaust Gas Denitrifying System of Ship}

The present invention relates to a ship flue gas denitrification system, comprising a discharge pipe through which exhaust gas containing nitrogen oxides generated in an engine of a ship is discharged, a reducing agent injection unit for injecting a reducing agent into the discharge pipe, And a reaction part for reducing the nitrogen oxide by decomposing the nitrogen oxide in the exhaust gas into nitrogen and water vapor by inducing a reduction reaction of the gas.

Recently, regulations on environmental pollution have been greatly strengthened internationally, and new agreements have been established and adopted to regulate the emission of air pollutants from ships. The International Maritime Organization (IMO) revised MARPOL IV in the Maritime Environment Protection Committee (MEPC) in July 2011 to develop a strong NOx emission (Tier III), which came into effect on January 1, 2016. As a result, it is now possible to operate the Emission Control Area (ECA) only when the exhaust gas denitration facility is installed in the engine of the newly constructed ship. Therefore, a flue gas denitrification system is becoming indispensable in ships.

As a conventional flue gas denitration system, a flue gas denitration system using a selective catalytic reduction (SCR) is mainly used. The selective reduction catalytic reaction is a representative denitrification technology for reducing nitrogen oxides by using a catalyst (platinum catalyst, V 2 O 5 , Al 2 O 3 , TiO 2 , Fe 2 O 3 , Cr 2 O 3, etc.) NH 3) as a reducing agent to reduce nitrogen oxides to nitrogen (N 2 ) and water (H 2 O). A flue gas denitration system using a selective reduction catalytic reaction is composed of a Urea Dosing unit and a Reactor. The urea dosing unit injects Urea into the exhaust gas discharged from the engine and induces vaporization, Is a part that allows ammonia to be converted into ammonia, and the reactor is a part that allows the reduction reaction using ammonia as a reducing agent to be actively performed by a built-in catalyst.

In the conventional flue gas denitrification system using the selective reduction catalytic reaction, the urea dosing unit induces the vaporization of the urea in the state that the urea is injected into the exhaust gas. In the case of the ship, since the temperature of the engine exhaust gas is as low as 180 to 210 캜, The element dosing part of the denitrification system has a configuration such as a vaporizer or a burner to ensure a temperature of 300 ° C or higher required for vaporization, and the configuration is complicated and the size of the equipment is increased. Also, in the conventional flue gas denitration system of a ship, when a plurality of engines are present in a ship, an independent dozing module is installed for each exhaust pipe of each engine. Such a configuration is not only a problem of insufficient installation space, Resulting in inefficiency in the operation of the same system.

Catalysts disposed in the reactor include catalysts obtained by sintering ceramics in the form of honeycomb by mixing active metals such as titanium oxide (TiO 2 ), vanadium (V), and tungsten (W) This type of catalyst is low in physical strength and durability, susceptible to moisture, and low in thermal conductivity, which takes a considerable amount of time to reach the activation temperature. In such a situation, in order to secure the strength and durability of the catalyst, the catalyst has to be made thick, so that the specific surface area of the catalyst is lowered, and the active metal existing inside the surface of the catalyst does not exhibit its function. As a result, in order to secure the specific surface area, the size of the catalyst is inevitably increased, and accordingly, the size of the reactor also increases, reaching 30 to 50% of the size of the engine. In addition, since it is vulnerable to vibration due to low strength, it is necessary to apply a technique that causes less vibration even in the application of a soot removal facility, and there is a restriction that the catalyst should be transported separately from the reactor at the time of construction. On the other hand, there is a metal catalyst having excellent strength and durability and excellent thermal conductivity, but its cost is high and it is pointed out that it is not economical to apply to a large-sized transportation means such as a ship.

In this situation, in order to reduce the installation space and simplify the structure of the flue gas NO x removal system of the ship using the selective reduction catalytic reaction, the structure of the urea injection part is improved and the efficiency of the catalyst incorporated in the reactor is increased Development is required.

Registered Patent No. 10-1195148 "System for Reduction of Exhaust Gas Hazardous Substances and Ship Containing the Same ", Oct. 29, Registered Patent No. 10-1345118 entitled " Method for producing titanium oxide nanotubes by anodic oxidation in aqueous electrolyte, "

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art,

It is an object of the present invention to provide a marine flue gas denitrification system that simplifies the structure of a flue gas denitration system of a ship using a selective reduction catalytic reaction and reduces installation space in the marine vessel.

It is another object of the present invention to provide a marine flue gas NO x removal system in which the dosing structure of the elements is improved and the efficiency of the catalyst incorporated in the reactor is improved.

It is a further object of the present invention to provide a reducing agent injection unit for injecting exhaust gas generated from an engine of a ship into an exhaust pipe through a heated compressed air and ammonia, The present invention is to provide a flue gas denitrification system which does not require a separate vaporizer for the flue gas.

It is a further object of the present invention to provide a control apparatus for a microcomputer which can finely control an injection amount of an element through injection of an element according to a pulse signal and to omit a configuration of a control valve and a flow meter, And to provide a ship flue gas denitrification system.

It is a further object of the present invention to provide a ducting module for supplying elements stored in an element tank under a predetermined condition so as to be able to supply elements to a plurality of ejecting modules so that even when there are a plurality of engines on a ship, It is an object of the present invention to provide a marine flue gas denitrification system that minimizes the installation space and enables economical operation of the system.

It is still another object of the present invention to provide a reducing agent injecting apparatus in which the pulse injector included in the ejecting module of the reducing agent injecting unit can be cooled by the compressed air to prevent damages caused by heat of the ejecting module, And to provide a denitration system.

It is another object of the present invention to provide a flue gas denitrification system including a catalyst capable of achieving miniaturization through a high specific surface area and ensuring economical efficiency while maintaining the advantages of high strength, durability and excellent thermal conductivity of a metal- And the like.

It is still another object of the present invention to provide an active metal layer containing a support made of a metal on which titanium oxide (TiO 2 ) nanotubes are formed and a support containing at least one of vanadium (V) and tungsten (W) The included high efficiency catalyst allows to reduce the thickness and size of the catalyst, the size of the reactor, the flexibility of the soot removal facility, and the ability to integrate the catalyst and the reactor during construction And to provide a ship flue gas denitrification system.

It is still another object of the present invention to provide a method of manufacturing a thin film magnetic recording medium by carrying out an atomic layer thin film deposition (ALD) method on an active metal layer on a support made of a metal on which titanium oxide (TiO 2 ) nanotubes are formed, And to provide a vessel flue gas denitrification system that ensures high efficiency.

In order to achieve the above object, the present invention is implemented by the following embodiments.

According to an embodiment of the present invention, a marine flue gas NO x removal system of the present invention includes a discharge pipe through which exhaust gas containing nitrogen oxides generated in an engine of a ship is discharged, a reducing agent injection unit for injecting a reducing agent into the discharge pipe And a reaction unit for inducing a reduction reaction of the exhaust gas mixed with the reducing agent to decompose the nitrogen oxides in the exhaust gas into nitrogen and water vapor, thereby reducing nitrogen oxides.

According to another embodiment of the present invention, in the vessel flue gas NO x removal system of the present invention, the reducing agent injection unit includes an element tank in which elements are stored, a dosing module for supplying the elements stored in the element tank under a predetermined condition, And an ejecting module for mixing the supplied element with the heated air to generate ammonia and injecting the generated ammonia into the discharge pipe.

According to another embodiment of the present invention, the ship flue gas NO x removal system of the present invention is characterized in that the dosing module includes an element pump for pumping elements stored in the element tank, And a dosing control device for receiving the measurement information of the pressure sensor and controlling the operation of the urea pump.

According to another embodiment of the present invention, the ship flue gas denitrification system of the present invention is characterized in that the dosing module supplies the elements to at least two or more of the plurality of the ejecting modules.

According to another embodiment of the present invention, in the vessel flue gas denitrifying system of the present invention, the ejecting module includes a chamber in which an outlet is communicated with the discharge pipe, and an element supplied by the dosing module, And a compressed air heating feeder for heating the compressed air to enter the chamber, wherein the element is converted into ammonia by mixing with heated compressed air inside the chamber, As shown in FIG.

According to another embodiment of the present invention, in the ship flue gas denitrification system of the present invention, the compressed air heating and supplying device includes a compressed air inlet to which compressed air is injected, and compressed air injected through the compressed air inlet A compressed air conveyance pipe for introducing the compressed air into the chamber, and a heating means for heating compressed air in the compressed air conveyance pipe.

According to another embodiment of the present invention, in the ship flue gas NO x removal system of the present invention, the pulse injector is cooled by compressed air before heating in a section disposed adjacent to the pulse injector And a heating unit disposed adjacent to the heating unit after the cooling unit and heating the compressed air passed through the cooling unit to transfer the heated compressed air to the chamber.

According to another embodiment of the present invention, the vessel flue gas denitrification system of the present invention is characterized in that the cooling unit is formed to surround the pulse injector.

According to another embodiment of the present invention, in the ship flue gas NOx removal system of the present invention, the heating means is a heater disposed inside or outside the heating unit.

According to another embodiment of the present invention, in the vessel flue gas NO x removal system of the present invention, the reaction section includes a catalyst for inducing a reduction reaction of exhaust gas mixed with the ammonia, and a reactor having the catalyst incorporated therein .

According to another embodiment of the present invention, in the vessel flue gas NO x removal system of the present invention, the catalyst comprises a support made of a metal having titanium oxide (TiO 2 ) nanotubes formed on the surface thereof and a support made of vanadium (V) and tungsten ) And an active metal layer supported on the support.

According to another embodiment of the present invention, in the ship f / 2 exhaust denitration system of the present invention, the support is characterized in that the metal is titanium (Ti).

According to another embodiment of the present invention, in the vessel flue gas desulfurization system of the present invention, the titanium oxide nanotubes have a diameter of 100 to 200 nm and a length of 300 nm to 1 μm.

According to another embodiment of the present invention, in the ship flue gas NO x removal system of the present invention, the support has a thickness of 0.1 to 0.15 mm.

According to another embodiment of the present invention, in the ship flue gas NO x removal system of the present invention, the support is changed into an anatase phase through heat treatment.

According to another embodiment of the present invention, the present invention is characterized in that the active metal layer is supported on the support by an atomic layer deposition (ALD) method.

The present invention has the following effects through the above-described configuration.

The present invention has an effect of providing a ship flue gas denitrification system that simplifies the structure of a flue gas NO x removal system of a ship using selective reduction catalytic reaction and reduces installation space in a ship.

INDUSTRIAL APPLICABILITY The present invention is effective in providing a ship flue gas denitrification system in which the dosing structure of the elements is improved and the efficiency of the catalyst incorporated in the reactor is improved.

The present invention comprises a reducing agent injecting unit for injecting ammonia into the exhaust pipe through which heated exhausted compressed air is injected into a discharge pipe through which exhaust gas generated from an engine of a ship is discharged, It is effective in providing a ship flue gas denitrification system that does not require a vaporizer.

The present invention relates to a flue gas denitrification system (hereinafter referred to as " flue gas denitrification ") system which enables fine control of the injection quantity of an element through injection of an element according to a pulse signal, And the like.

In the present invention, the dosing module that supplies the elements stored in the element tank under a predetermined condition is configured to be able to supply the elements to a plurality of the ejecting modules, so that even when there are a plurality of engines on the ship, There is no need to provide a flue gas denitrifying system that minimizes installation space and enables economical system operation.

The present invention provides a ship flue gas denitrification system that prevents the damage of the ejecting module due to heat even when the compressed air is heated because cooling of the pulse injector included in the ejecting module of the reducing agent injecting unit can be performed by compressed air .

The present invention provides a marine flue gas denitrification system including a catalyst which can be miniaturized through a high specific surface area and is economical, while retaining advantages of a high strength, durability, and excellent thermal conductivity of a metal-made catalyst .

The present invention relates to a high-efficiency catalyst comprising a support made of a metal on which titanium oxide (TiO 2 ) nanotubes are formed on a surface and an active metal layer containing at least one of vanadium (V) and tungsten (W) Which enables to reduce the thickness and size of the catalyst and the size of the reactor and to apply the soot removal equipment with flexibility and to integrate the catalyst and the reactor during the construction, And the like.

The present invention provides a highly efficient catalyst with a substantially maximized specific surface area by supporting an active metal layer on a support made of a metal on which titanium oxide (TiO 2 ) nanotubes are formed on the surface by atomic layer deposition (ALD) The present invention is effective in providing a ship flue gas denitrification system.

1 is a perspective view of a marine flue gas denitrification system according to an embodiment of the present invention;
2 is a block diagram of the ship flue gas NO x removal system shown in Fig. 1
3 is a detailed block diagram of the dosing module
FIG. 4A is a configuration diagram of a ship flue gas denitrification system to which a conventional dosing module is applied
FIG. 4B is a configuration diagram of a ship flue gas NO x removal system according to another embodiment of the present invention
5 is a detailed block diagram of the ejecting module
6 is a detailed configuration diagram of the reaction part
7 is a cross-sectional view of the support of the catalyst
8 is a cross-sectional view showing a state in which an active metal layer is formed on a catalyst surface of a conventional metallic material and a metallic material included in the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and, if conflict with the meaning of the terms used herein, It follows the definition used in the specification. Further, the detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 1 is a perspective view of a marine flue gas NO x removal system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a marine flue gas NO x removal system shown in FIG.

1 and 2, the present invention is a flue gas NO x removal system of a ship using a selective catalytic reduction (SCR), comprising a discharge pipe 1, a reducing agent injection unit 3, (5) and a control unit (7).

The discharge pipe (1) is a passage through which exhaust gas containing nitrogen oxides generated in the engine (E) of the ship is discharged. The exhaust gas is moved to the reaction part 5 through the discharge pipe 1 and the reducing agent injecting part 3 is moved to the inside of the discharge pipe 1 before the exhaust gas reaches the reaction part 5. [ Lt; RTI ID = 0.0 > ammonia < / RTI > When there are a plurality of engines E of the ship, the discharge pipe 1 is installed for each engine E.

The reducing agent injecting unit 3 injects a reducing agent into the discharge tube 1. In the present invention, as the reducing agent, urea is vaporized and ammonia (NH3) which is changed is used. The reducing agent injection unit 3 includes an urea tank 31, a dosing module 33, and an injection module 35.

The element tank 31 stores elements. Selective reduction catalyst reaction catalyst (the platinum-containing catalyst, V 2 O 5, Al 2 O 3, TiO 2, Fe 2 O 3, Cr 2 O 3 , etc.) a nitrogen oxide using a nitrogen (N 2) and water (H 2 O). Ammonia is used as a reducing agent. In the present invention, the urea is converted into ammonia and enters the reaction unit. The urea tank 31 stores an element to be converted into a reducing agent.

The dosing module (33) serves to supply the elements stored in the element tank (31) under a predetermined condition. 3 shows a detailed block diagram of the dosing module 33. The dosing module 33 includes an element pump 331 for pumping elements stored in the element tank 31, A dosing control device 335 for receiving the measurement information of the pressure sensor 333 and controlling the operation of the urea pump 331, a pressure sensor 333 for measuring the pressure of the element supplied to the ejecting module 35, ).

The element pump 331 transports the element stored in the element tank 31 to the ejecting module 35 under the control of the dosing controller 335. The control of the urea pump 331 is performed by the dosing control device 335.

The pressure sensor 333 measures the pressure of the element between the urea pump 331 and the injection module 35 and provides the measured pressure to the dosing control unit 335. The pressure sensor 333 may be a general pressure sensor.

The dosing control unit 335 may be a computing module, generally called a control unit, and controls the urea pump 331. The dosing control unit 335 can independently control the output of the urea pump 31 based on the pressure of the element provided by the pressure sensor 333. However, And may control the output of the urea pump 31 by receiving a control command from the controller 7. Since the control unit 7 is a control panel that performs overall control of the flue gas NO x removal system of the present invention, when the dosing control unit 35 is operated by the control unit 7, . For this purpose, the dosing control unit 335 may provide the control unit 7 with the pressure of the element measured by the pressure sensor 333. The dosing control unit 335 also transmits a pulse signal to the pulse injector 353 to be described later. It is also preferable that the dosing control unit 335 can receive the control command from the control unit 7 .

The dosing module 33 may be configured to supply the elements to a plurality of the ejecting modules 35 when there are two or more of the plurality of the ejecting modules 35. A large-sized ship has a plurality of engines. Conventionally, as shown in FIG. 4A, an independent dosing module D is installed for each engine E is used. Specifically, under control of the control panel C, the pumping unit P supplies an element to each dosing module D, and each of the dosing modules D is controlled by the control panel C, (N). Such a configuration not only causes a shortage of installation space but also causes inefficiency of the system operation such as overdistribution of elements. However, according to the present invention, a configuration as shown in FIG. 4B is possible. 4B, the dosing control unit 335 communicates with the control unit 7 in a state where the ejecting module 35 is installed in each discharge pipe 1, and the discharge control unit 335 communicates with the discharge pipe 1 And to control the pulse injector 353 of each of the above-described ejecting modules 35. In the present embodiment,

The injecting module 35 mixes the elements supplied by the dosing module 33 with the heated air to generate ammonia and injects the ammonia into the discharge pipe 1. 5 shows a detailed block diagram of the ejecting module 35. As shown in FIG. Referring to FIG. 5, the ejecting module 35 includes a chamber 351, a pulse injector 353, and a compressed air heating and supplying unit 355.

The chamber 351 is a space in which the discharge port 3511 communicates with the discharge pipe 1 and is a space in which the element and the heated compressed air are mixed to vaporize the element into ammonia. The exhaust port 3511 is formed as a small hole as compared with the chamber 351. Since the heated compressed air and the element are continuously supplied into the chamber 351, the ammonia generated in the chamber 351 And is continuously injected into the discharge pipe 1 by internal pressure.

The pulse injector 353 injects the element supplied by the dosing module 33 into the chamber 351 according to a pulse signal. The pulse signal is provided by the dosing control unit 335 of the dosing module 33 as described above and the dosing control unit 335 communicates with the control unit 7, And receives a control command. The pulse injector 353 can be controlled by a pulse signal of a very short time unit (for example, 占 퐏 ec), so that the fine spray of the element . As a result, according to the present invention, the efficiency of the system can be improved.

The compressed air heating and supplying unit 355 heats the compressed air to flow into the chamber 351. The heated compressed air vaporizes the element injected into the chamber 351 by the pulse injector 353 into ammonia. The compressed air heating feeder 355 includes a compressed air inlet 3551, a compressed air conveyance pipe 3553 and a heating means 3555.

The compressed air inlet 3551 provides a path through which compressed air is injected. The compressed air injected through the compressed air inlet 3551 may be supplied from the dosing module 33 or may be supplied through an independent path. When the compressed air is supplied from the dosing module 33, the dosing control unit 335 controls the supply of the compressed air under the control of the control unit 7.

The compressed air transfer pipe 3553 transfers the compressed air injected through the compressed air inlet 3551 to the chamber 351. The compressed air conveyance pipe 3553 is a section adjacent to the pulse injector 353 and includes a cooling unit 3553a for cooling the pulse injector 353 by compressed air before heating, And a heating unit 3553b disposed adjacent to the heating unit 3555 to heat and transfer the compressed air having passed through the cooling unit 3553a to the chamber 351a. Since the pulse injector 353 includes a plastic material, the pulsed injector 353 may be damaged by heat. By arranging the compressed air transfer pipe 3553 as described above, it is possible to prevent the pulse injector 353 from intensively The compressed air can be heated and the efficiency of heating can be increased. Meanwhile, the cooling unit 3553a is preferably formed to surround the pulse injector 353 for efficient cooling. For this, a double pipe structure may be used.

The heating means 3555 heats the compressed air inside the compressed air transfer pipe 3553. The heating unit 3555 may be a heater disposed inside or outside the heating unit 3553b. In order to vaporize the element with ammonia, it is necessary to heat the compressed air to 300 to 350 ° C or more. The heating means 3555 for efficient heating is composed of two line heaters, As shown in FIG.

In this way, the injection module 35 mixes the elements supplied by the dosing module 33 with the heated air to generate ammonia and injects the ammonia into the discharge pipe 1, It is not necessary to provide a vaporizer or a burner for maintaining the minimum temperature at which the urea is vaporized by ammonia. Therefore, according to the present invention, not only the configuration of the element dosing unit of the ship flue gas NO x removal system can be simplified, but also the installation space can be drastically reduced.

The reaction part 5 induces a reduction reaction of the exhaust gas mixed with the ammonia to decompose the nitrogen oxide in the exhaust gas into nitrogen and water vapor, thereby reducing the nitrogen oxide. Fig. 6 shows a detailed configuration of the reaction part 5. As shown in Fig. Referring to FIG. 6, the reaction unit 5 includes a catalyst 51 and a reactor 53.

The catalyst 51 serves to induce a reduction reaction of the exhaust gas mixed with the ammonia. The catalyst 51 includes a support 511 and an active metal layer 513.

The support 511 is made of a metal having titanium oxide (TiO 2 ) nanotubes 511a formed on its surface, and the metal may be made of titanium (Ti). The support body 511 is made of titanium oxide nanotubes grown on a titanium plate through an anodic oxidation process using an electrolyte of a specific component such as ethylene glycol or HF and is subjected to heat treatment to form amorphous Can be made by changing the titanium nanotubes 511a into an anatase crystal structure having a good crystal structure of reactivity.

7, the support 511 has a thickness of 0.1 to 0.15 mm, the titanium oxide nanotube 511a has a diameter of 100 to 200 nm, And a length of 300 nm to 1 占 퐉. Considering that the honeycomb type ceramic catalyst has a thickness of 0.3 to 0.4 mm in cross section, the catalyst 51 is thinner than 50% of the conventional catalyst. Also, since the inside and the outside of the titanium oxide nanotubes 511a are the contact surfaces of the exhaust gas and ammonia, the specific surface area is also very large as compared with the conventional catalyst. The average surface velocity of the conventional catalyst is 8,000 to 10,000, Which allows the surface flow rate of about 60,000 or more to be secured.

The active metal layer 513 contains at least one of vanadium (V) and tungsten (W) and is supported on the support (511). The active metal layer 513 includes metals having catalytic activity such as vanadium (V) tungsten (W) in the form of V 2 O 5 having catalytic activity and is supported on the support 511 511 is coated on the surface of the support 511 including the surface of the titanium oxide nanotubes 511a.

The active metal layer 513 is preferably coated on the support 511 by atomic layer deposition (ALD). Conventionally, a wash coat method has been applied to coat an active metal layer on a surface of a metal support. Since the wash-coat method has a problem that it is difficult to precisely control the catalyst of the conventional metal, the coating of the active metal layer (C) on the surface voids (S) of the support becomes uneven as shown in Fig. 8 . When the active metal layer 513 is coated on the support 511 by applying the conventional wash coat method, the titanium oxide nanotube 511a has a diameter of a very small value as compared with the gap S of the conventional metal support The titanium oxide nanotubes 511a are clogged by the active metal layer 513 and the effect of increasing the specific surface area through the titanium oxide nanotubes 511a is hardly exhibited. In order to prevent this, it is preferable that atomic layer thin film deposition (ALD) method in which an active metal is supported in a thin atomic layer is applied to the titanium oxide nanotube 511a as shown in FIG. 8 (b) The active metal layer 513 can be formed in such a manner that the surface area of the active metal layer 513 can be maintained.

The reactor 53 is a space in which the reduction reaction in which nitrogen oxide in exhaust gas in contact with the catalyst 51 is changed into nitrogen and water using ammonia as a reducing agent proceeds into a space where the catalyst 51 is embedded. As described above, since the catalyst 51 is a highly efficient catalyst having a very large specific surface area and a small thickness, it can be miniaturized as compared with the conventional catalyst. In addition, the catalyst 51 is a metal material having excellent strength and durability and resistance to moisture. Therefore, according to the present invention, it is possible to reduce the size of the reactor 53, to move and install the reactor 53 integrally with the reactor 53 during the construction process of the system, It is possible to flexibly apply a soot removal facility that can be installed inside and outside the reactor 53.

The control unit 7 controls the ship's flue gas NO x removal system including the reducing agent injection unit 3 and the reaction unit 5. The control unit 7 is generally referred to as a control panel in an automation facility. The specific control execution example of the control unit 7 has been described above with reference to the dosing control unit 335 of the dosing module 33. [ In addition, the control unit 7 performs reaction control of the reactor 53, control of the soot removal apparatus, and the like.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.

1: discharge pipe
3: Reducing agent injection part
31: Element tank
33: dosing module
331: Element pump 333: Pressure sensor
335: Dosing control device
35: Injecting module
351: chamber 353: pulse injector
355: Compressed air heating supply 3551: Compressed air inlet
3553: Compressed air transfer pipe 3553a:
3553b: heating section 3555: heating means
5: Reaction part
51: Catalyst
511: Support body 511a: Titanium oxide nanotube
513: active metal layer
53: Reactor
7:

Claims (16)

A reducing agent injecting section for injecting a reducing agent into the discharge pipe; and a reducing agent introducing section for introducing a reducing agent into the exhaust tube to induce a reducing reaction of the exhaust gas mixed with the reducing agent, And a reaction part for reducing nitrogen oxide by decomposing nitrogen oxide into nitrogen and water vapor,
The reducing agent injecting unit may include an element tank in which the element is stored, an dosing module that supplies the elements stored in the element tank under a predetermined condition, and an element that the dosing module supplies to the heated air to generate ammonia, An injection module,
Wherein the ejecting module includes a chamber communicated with the discharge pipe, a pulse injector injecting the element supplied by the dosing module into the chamber according to a pulse signal, a compressed air heating and supplying unit Lt; / RTI >
The compressed air heating and supplying device includes a compressed air inlet for injecting compressed air, a compressed air conveying tube for conveying the compressed air injected through the compressed air inlet and introducing the compressed air into the chamber, Including heating means for heating,
Wherein the element is mixed with the heated compressed air in the chamber to convert it into ammonia to be injected into the discharge pipe through the discharge port. delete The method according to claim 1,
The dosing module comprises:
An element pump for pumping the element stored in the element tank,
A pressure sensor for measuring a pressure of an element supplied to the ejecting module,
And a dosing control device for receiving the measurement information of the pressure sensor and controlling the operation of the urea pump.
The method according to claim 1,
Wherein the dosing module supplies the elements to at least two or more of the plurality of the ejecting modules.
delete delete 2. The apparatus of claim 1, wherein the compressed air delivery pipe includes a cooling unit for cooling the pulse injector by compressed air before heating,
And a heating unit for heating the compressed air having passed through the cooling unit to flow into the chamber.
8. The method of claim 7,
Wherein the cooling unit is formed to surround the pulse injector.
8. The method of claim 7,
Wherein the heating means is a heater disposed inside or outside the heating unit.
The method according to claim 1,
The reaction unit includes:
A catalyst for inducing a reduction reaction of the exhaust gas mixed with the ammonia,
And a reactor in which the catalyst is embedded.
11. The method of claim 10,
The catalyst may comprise,
A support made of a metal on which titanium oxide (TiO 2 ) nanotubes are formed on the surface,
Wherein the active metal layer contains at least one of vanadium (V) and tungsten (W) and is supported on the support.
12. The method of claim 11,
Wherein the support is made of titanium (Ti).
13. The method of claim 12,
Wherein the titanium oxide nanotubes have a diameter of 100 to 200 nm and a length of 300 nm to 1 占 퐉.
14. The method of claim 13,
Wherein the support has a thickness of 0.1 to 0.15 mm.
13. The method of claim 12,
Wherein the support is changed into an anatase phase through heat treatment.
16. The method of claim 15,
Wherein the active metal layer is supported on the support by atomic layer deposition (ALD).
KR1020160180422A 2016-12-27 2016-12-27 Exhaust Gas Denitrifying System of Ship KR101864749B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020160180422A KR101864749B1 (en) 2016-12-27 2016-12-27 Exhaust Gas Denitrifying System of Ship
PCT/KR2017/008532 WO2018124418A1 (en) 2016-12-27 2017-08-08 Flue gas denitrogenization system for ship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160180422A KR101864749B1 (en) 2016-12-27 2016-12-27 Exhaust Gas Denitrifying System of Ship

Publications (1)

Publication Number Publication Date
KR101864749B1 true KR101864749B1 (en) 2018-06-08

Family

ID=62599837

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160180422A KR101864749B1 (en) 2016-12-27 2016-12-27 Exhaust Gas Denitrifying System of Ship

Country Status (2)

Country Link
KR (1) KR101864749B1 (en)
WO (1) WO2018124418A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109569240B (en) * 2018-12-14 2021-08-13 山东汇之蓝环保科技有限公司 Efficient denitration ionic liquid and use method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101195148B1 (en) 2010-07-29 2012-10-29 삼성중공업 주식회사 System for reducing hazardous substances in exhaust gas and vehicle including the same
KR101345118B1 (en) 2011-06-24 2013-12-26 한국기계연구원 A method for manufacturing TiO2 nanotubes by anodic oxidation in aqueous solutions
KR101402375B1 (en) * 2013-04-24 2014-06-03 현대중공업 주식회사 Urea supply device in selective catalytic reduction system and working method thereof
KR101636208B1 (en) * 2015-05-13 2016-07-20 두산엔진주식회사 Power plant with selective catalytic reuction system
KR20160109984A (en) * 2015-03-13 2016-09-21 현대중공업 주식회사 Power plant system for a ship
KR20160141104A (en) * 2015-05-28 2016-12-08 주식회사 나노 Titanium dioxide nanocomposites for Plate-type Selective Catalytic Reduction

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4317345B2 (en) * 2002-02-26 2009-08-19 株式会社日本触媒 Low concentration CO-containing exhaust gas treatment method
DE102011016967A1 (en) * 2011-04-13 2012-10-18 Emitec Gesellschaft Für Emissionstechnologie Mbh Method for operating an SCR dosing unit
KR101476757B1 (en) * 2012-12-13 2014-12-26 한국기계연구원 Exhaust gas purification system
KR101601520B1 (en) * 2014-10-30 2016-03-08 두산엔진주식회사 System for selective catalytic reuction and method for selective catalytic reduction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101195148B1 (en) 2010-07-29 2012-10-29 삼성중공업 주식회사 System for reducing hazardous substances in exhaust gas and vehicle including the same
KR101345118B1 (en) 2011-06-24 2013-12-26 한국기계연구원 A method for manufacturing TiO2 nanotubes by anodic oxidation in aqueous solutions
KR101402375B1 (en) * 2013-04-24 2014-06-03 현대중공업 주식회사 Urea supply device in selective catalytic reduction system and working method thereof
KR20160109984A (en) * 2015-03-13 2016-09-21 현대중공업 주식회사 Power plant system for a ship
KR101636208B1 (en) * 2015-05-13 2016-07-20 두산엔진주식회사 Power plant with selective catalytic reuction system
KR20160141104A (en) * 2015-05-28 2016-12-08 주식회사 나노 Titanium dioxide nanocomposites for Plate-type Selective Catalytic Reduction

Also Published As

Publication number Publication date
WO2018124418A1 (en) 2018-07-05

Similar Documents

Publication Publication Date Title
EP1785606A1 (en) Exhaust gas purifier
US8071037B2 (en) Catalytic devices for converting urea to ammonia
KR102197457B1 (en) Reductant delivery unit for automotive selective catalytic reduction with reducing agent heating
US20090107120A1 (en) Method and device for treating the exhaust gas of an internal combustion engine
US9856774B2 (en) Engine exhaust system
EP1582711B1 (en) System and method for purifying an exhaust gas
US20110030343A1 (en) Scr reductant deposit removal
CN105050692A (en) Reductant injection device, exhaust gas processing apparatus and exhaust gas processing method
WO2012128145A1 (en) Urea solution reformer and exhaust gas purifier using same
US9677440B2 (en) Aftertreatment system incorporating hydrolysis catalyst with particulate filtration and SCR
US9890682B2 (en) System, apparatus, and method to address unwanted DEF-based deposits in diesel exhaust system
US20110030350A1 (en) Exhaust gas purifying apparatus
JP2011032999A (en) Exhaust emission control device
KR102004477B1 (en) Exhaust Gas Denitrifying System of Ship
JP2013531762A (en) Exhaust gas treatment device
US10337381B2 (en) Exhaust gas aftertreatment device for an internal combustion engine
CN102165153A (en) Exhaust gas cleaning arrangement and method for exhaust gas cleaning using a reducing agent
KR101864749B1 (en) Exhaust Gas Denitrifying System of Ship
US10876454B2 (en) Automotive exhaust aftertreatment system with multi-reductant injection and doser controls
JP2012197695A (en) Urea solution reformer and exhaust gas purifier using the same
US8549841B2 (en) Method and device for the controlled feeding of a reducing agent
CN108472644A (en) System and method for remanufacturing selective catalytic reduction system operating
CN112502812A (en) Heated spray nozzle
KR102367278B1 (en) Selective catalytic reduction system
US20090198087A1 (en) Method and Device for Providing a Reducing Agent Precursor

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant