CN116241359A - Ship engine tail gas pollutant treatment device and pollutant treatment method - Google Patents

Ship engine tail gas pollutant treatment device and pollutant treatment method Download PDF

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Publication number
CN116241359A
CN116241359A CN202310184447.8A CN202310184447A CN116241359A CN 116241359 A CN116241359 A CN 116241359A CN 202310184447 A CN202310184447 A CN 202310184447A CN 116241359 A CN116241359 A CN 116241359A
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shell
urea
gas
selective reduction
channel
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CN116241359B (en
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席鸿远
莫杰
周松
张天鹏
任建军
朱云龙
周洪杰
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Harbin Engineering University
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Harbin Engineering University
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    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/004—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/0892—Electric or magnetic treatment, e.g. dissociation of noxious components
    • 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]
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F01N2570/145—Dinitrogen oxide
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention provides a device and a method for treating pollutants in tail gas of a ship engine, and belongs to the field of treatment of tail gas of a ship engine. Solves the problem of N in the existing ship tail gas treatment technology under the low-temperature condition 2 The O decomposition efficiency is low and the stress of the catalyst is concentrated. A ship engine tail gas pollutant treatment device comprises a urea supply mechanism, a selective reduction assembly, a shell, an exhaust passage, a plasma ionization assembly and N 2 O catalytic decomposition catalyst, urea outlet end of urea supply mechanism is equidirectionally set in the air inlet channel of shell, in the shell interior a selective reduction component is coaxially set, and the communication position of exhaust channel and shell body is equipped with N 2 The catalyst for the catalytic decomposition of O,the selective reduction assembly is used for receiving the gas mixture after the reaction of the gas conveyed from the gas inlet passage of the shell and the urea and conveying the gas mixture into the exhaust passage along the radial direction of the shell, and the plasma ionization assembly is used for ionizing the gas. It is mainly used for treating the tail gas of ship engines.

Description

Ship engine tail gas pollutant treatment device and pollutant treatment method
Technical Field
The invention belongs to the field of ship engine tail gas treatment, and particularly relates to a ship engine tail gas pollutant treatment device and a pollutant treatment method.
Background
The ship engine can generate a large amount of NO in the working process X And a small amount of N 2 O, combustion work of the ship engine is caused by NO in the ship exhaust gas X And N 2 The main reason for O generation is N in intake air of ship engine under high temperature condition 2 N at flame temperature 2 Oxidation to NO and N 2 O, NOx in marine exhaust is one of the main pollutants in the marine atmosphere and coastal urban air.
N 2 O is super greenhouse gas, and the greenhouse effect is CO 2 The ozone layer of the earth is destroyed while the greenhouse effect is brought, and the ozone layer damage the environment and influence the health of human bodies. IMO of International maritime organization has strict limit standard on exhaust emission of ships, wherein the standard of emission of MARBOL convention Tier III is formally implemented on the 1 st of 2016 and NO of ship engine X And (2) present greater challenges for emissions control, numerous research institutions are also in marine NO X Numerous achievements in emission control have been made, with the proposal of the carbon neutralization and carbon peak-to-peak policy N 2 The treatment of O is also of increasing interest.
Selective Catalytic Reduction (SCR) technology is currently the most effective denitration technology, and marine SCR technology is NH produced from aqueous urea solutions 3 As a reducing agent, at V 2 O 5 NO in ship tail gas is reacted by SCR catalyst X Is reduced toN 2 In the selective catalytic reduction of NO X N is generated in the process of (2) 2 O, make N in tail gas 2 The content of O increases, and N 2 The treatment technology of O is mostly direct catalytic decomposition, and N is directly catalytic decomposed 2 O technology is to make N under the action of catalyst 2 Catalytic decomposition of O into N 2 And O 2 Is a technology of (a). The tail gas of the ship contains O 2 In the catalytic decomposition of N 2 O in the process of O 2 Will preempt catalytic decomposition N 2 The active sites on the O catalyst result in reduced efficiency of decomposition at low temperatures.
Aiming at NO in the tail gas of the existing ship X The treatment method has the problems of developing a method for better treating NO under the low temperature condition X And N 2 O and the marine denitration device for avoiding the concentration of the stress of the catalyst are of great significance.
Disclosure of Invention
In view of the above, the present invention is directed to a device for treating marine engine exhaust gas pollutants, so as to solve the problem of N in the existing marine exhaust gas treatment technology under low temperature conditions 2 The O decomposition efficiency is low and the stress of the catalyst is concentrated.
To achieve the above object, according to one aspect of the present invention, there is provided a marine engine exhaust gas pollutant treatment device comprising a urea supply mechanism, a selective reduction assembly, a housing, an exhaust passage, a plasma ionization assembly, and N 2 O catalytic decomposition catalyst, urea outlet end of urea feed mechanism is equidirectional to be set up in the inlet channel of casing, set up the selective reduction subassembly in the casing coaxial, the casing inner wall encloses with the selective reduction subassembly outer wall and closes into the exhaust passage, the exhaust passage communicates with the outlet channel of casing, the exhaust passage is equipped with N with the junction of casing 2 O catalytic decomposition catalyst, said N 2 The O catalytic decomposition catalyst is coaxially arranged with the shell, the selective reduction component is used for receiving the gas mixture after the reaction of the gas conveyed by the shell air inlet channel and the urea and conveying the gas mixture into the exhaust passage along the radial direction of the shell, the SCR catalyst is arranged on the inner wall of the selective reduction component, and a plurality of SCR catalysts are arranged at the tail end of the exhaust passage along the circumferential direction of the shellAnd a plasma ionization assembly for ionizing a gas.
Still further, the casing is hollow solid of revolution, the casing includes inlet channel, treatment channel and gas outlet channel, inlet channel and the gas outlet channel pipe diameter of casing are all less than the treatment channel, selective reduction subassembly sets up in the treatment channel.
Further, the N is 2 The O catalytic decomposition catalyst is hollow cylinder-shaped, and the N is 2 The O catalytic decomposition catalyst is arranged in a transition zone where the pipe diameter of the treatment channel gradually narrows towards the pipe diameter of the gas outlet channel.
Still further, urea feed mechanism includes urea injection subassembly, electronic control valve and urea storage subassembly, urea storage subassembly's output passes through electronic control valve and urea injection subassembly intercommunication, urea injection subassembly's urea outlet end syntropy sets up in the air inlet channel of casing.
Further, the selective reduction assembly is a gyrorotor.
Still further, selective reduction subassembly still includes first sealing baffle, column metal isolation net and second sealing baffle, column metal isolation net is cylindric, column metal isolation net is close to casing inlet channel one side opening edge and is provided with first sealing baffle, first sealing baffle is the ring shape, first sealing baffle outward flange links to each other with shells inner wall, column metal isolation net opposite side opening is equipped with the second sealing baffle, SCR catalyst sets up on column metal isolation net inboard guipure.
Still further, the selective reduction assembly further comprises a backflow prevention plate, wherein the backflow prevention plate is arranged at an opening of one side of the columnar metal isolating net, which is close to the air inlet channel of the shell.
Further, the plasma ionization assembly is provided with two.
Further, the plasma ionization comprises an arc-shaped outer electrode and an arc-shaped inner electrode, wherein the arc-shaped outer electrode is arranged on the outer wall of the shell, and the arc-shaped inner electrode is arranged in the exhaust passage.
According to another aspect of the present invention, there is provided a method for treating exhaust gas pollutants of a ship engine, using the above-mentioned apparatus for treating exhaust gas pollutants of a ship engine, comprising the steps of:
s1, urea is injected by a urea supply mechanism while ship tail gas enters through a shell air inlet channel, and is decomposed into NH (NH) 3 ；
S2, ship tail gas and NH 3 Entering a columnar metal isolation net to contact with the SCR catalyst for reaction, and then radially entering an exhaust passage;
s3, moving the gas in the exhaust passage to a plasma ionization assembly for ionization;
s4, ionized gas and N 2 And (3) discharging the catalyst from the air outlet channel of the shell after the O-catalytic decomposition catalyst reacts.
Compared with the prior art, the invention has the beneficial effects that:
1. the ship engine tail gas pollutant treatment device comprises a selective reduction component, a plasma ionization component and N 2 O catalytic decomposition catalyst step coupling arrangement can be used for removing NO X Is to remove N at the same time 2 O, the ship denitration technology is more perfect;
2. the ship engine tail gas pollutant treatment device is different from the axial flow catalyst, but radially flows through the SCR catalyst, so that the ship tail gas and the catalyst layer have larger contact area, the damage to the catalyst caused by the non-uniformity of speed and pressure in the shell air inlet channel of the ship tail gas is avoided, the catalytic effect is effectively enhanced, and the service life of the catalyst is prolonged;
3. the ship engine tail gas pollutant treatment device uses the plasma ionization component to cooperatively remove N 2 O, plasma and N 2 The O catalyst can produce synergistic effect to reduce O 2 For N 2 The influence of the O decomposition efficiency improves the low-temperature decomposition of N 2 The efficiency of O;
4. the two groups of plasma ionization components work separately, so that the energy waste can be reduced as much as possible while the emission requirement is met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic structural view of a marine engine exhaust gas pollutant treatment device according to the present invention;
fig. 2 is a schematic diagram of the gas flow direction of a marine engine exhaust gas pollutant treatment device according to the present invention.
A urea injection assembly 1; an electronic control valve 2; a urea storage assembly 3; a first sealing baffle 4; a backflow prevention plate 5; a housing 6; an exhaust passage 7; an SCR catalyst 8; a columnar metal isolation net 9; an arc-shaped outer electrode 10; an arc-shaped inner electrode 11; a second sealing barrier 12; n (N) 2 The O-catalytic decomposition catalyst 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, in the case of no conflict, embodiments of the present invention and features of the embodiments may be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to the drawings for illustrating the present embodiment, according to one aspect of the present invention, there is provided a marine engine exhaust gas pollutant treating apparatus comprising a urea supply mechanism, a selective reduction assembly, a housing 6, an exhaust passage 7, a plasma ionization assembly and N 2 O catalytic decomposition catalyst 13, urea outlet end syntropy setting of urea feed mechanism is in the air inlet channel of casing 6, set up the selective reduction subassembly in the casing 6 coaxial, the casing 6 inner wall encloses with the selective reduction subassembly outer wall and closes into exhaust passage 7, exhaust passage 7 and the air outlet channel intercommunication of casing 6, exhaust passage 7 and the intercommunication department of casing 6 are equipped with N 2 O catalyst 13, said N 2 The O-catalytic decomposition catalyst 13 is coaxially arranged with the housing 6, and the selective reduction assembly is used for receiving the gas mixture after the reaction of the gas and urea conveyed from the gas inlet channel of the housing 6 and radially conveying the gas mixture into the exhaust passage 7 along the housing 6The inner wall of the selective reduction assembly is provided with an SCR catalyst 8, and the tail end of the exhaust passage 7 is provided with a plurality of plasma ionization assemblies along the circumference of the shell 6, wherein the plasma ionization assemblies are used for ionizing gas.
In this embodiment, the casing 6 is the cavity solid of revolution, the casing 6 includes inlet channel, treatment channel and gas outlet channel, the inlet channel and the gas outlet channel pipe diameter of casing 6 are all less than the treatment channel, the selective reduction subassembly sets up in the treatment channel, through the setting of pipe diameter, can make gaseous slowing down when getting into the treatment channel, prevents that pressure from causing too big pressure to the SCR catalyst 8 of selective reduction subassembly, simultaneously when gaseous entering the gas outlet channel, can make the velocity of flow accelerate because the reducing effect of pipeline for gaseous discharge.
In the present embodiment, the N 2 The O catalytic decomposition catalyst 13 is hollow and cylindrical, and the N is 2 The O catalytic decomposition catalyst 13 is arranged in a transition zone where the pipe diameter of the treatment channel gradually narrows towards the gas outlet channel, and can obtain larger contact area, so that gas and N 2 The O catalyst 13 is fully contacted and is convenient for N 2 The O-catalytic decomposition catalyst 13 is positionally mounted within the housing 6.
In this embodiment, the urea supply mechanism includes an injection assembly 1, an electronic control valve 2 and a storage assembly 3, the output end of the urea storage assembly 3 is communicated with the urea injection assembly 1 through the electronic control valve 2, the urea outlet end of the urea injection assembly 1 is arranged in the air inlet channel of the housing 6 in the same direction, and when urea is injected, urea in the urea storage assembly 3 is injected from the urea injection assembly 1 under the control of the electronic control valve 2.
In this embodiment, the selective reduction assembly is a revolving body, so that the selective reduction assembly is convenient to locate and install in the housing 6, and wind resistance is reduced.
In this embodiment, the selective reduction assembly further includes a first sealing baffle 4, a columnar metal isolation net 9 and a second sealing baffle 12, the columnar metal isolation net 9 is cylindrical, the edge of the columnar metal isolation net 9, which is close to the opening at one side of the air inlet channel of the shell 6, is provided with the first sealing baffle 4, the first sealing baffle 4 is circular, the outer edge of the first sealing baffle 4 is connected with the inner wall of the shell 6, the opening at the other side of the columnar metal isolation net 9 is provided with the second sealing baffle 12, the SCR catalyst 8 is arranged on the inner side net surface of the columnar metal isolation net 9, and the whole SCR catalyst 8 is hollow and cylindrical. The fixing of the SCR catalyst 8 is completed through the columnar metal isolation net 9, and meshes are provided for radial discharge of gas into the exhaust passage 7, so that the damage to the catalyst caused by non-uniformity of speed and pressure in the traditional axial gas flow mode can be avoided, the purposes of reducing back pressure and weakening stress concentration of the catalyst are realized, the catalytic effect is effectively enhanced, and the service life of the catalyst is prolonged.
In this embodiment, the selective reduction assembly further includes a backflow prevention plate 5, where the backflow prevention plate 5 is disposed at an opening of the columnar metal isolation net 9 near one side of the air inlet channel of the housing 6, and the backflow prevention plate 5 is disposed in two and vertically symmetrical arrangements, and the backflow prevention plate 5 is inclined toward one side of the air outlet channel of the housing 6, so that windward resistance is reduced, and at the same time, backflow of gas is prevented.
In this embodiment, the plasma ionization subassembly is provided with two, and two plasma ionization subassemblies independently work, can reduce the energy waste as far as possible when satisfying emission requirement, can avoid when one plasma ionization subassembly became invalid simultaneously, and another one can guarantee normal work, prevents that device processing function from becoming invalid.
In this embodiment, the plasma ionization includes an arc-shaped outer electrode 10 and an arc-shaped inner electrode 11, the arc-shaped outer electrode 10 is disposed on the outer wall of the housing 6, the arc-shaped inner electrode 11 is disposed in the exhaust passage 7, and the arc-shaped outer electrode 10 and the arc-shaped inner electrode 11 are both disposed in an arc-shaped sheet structure, so that the plasma ionization can be better adapted to the housing 6.
According to another aspect of the present invention, there is provided a method for treating exhaust gas pollutants of a ship engine, using the above-mentioned apparatus for treating exhaust gas pollutants of a ship engine, comprising the steps of:
s1, urea is injected by a urea supply mechanism while ship tail gas enters from an air inlet channel of a shell 6, and is decomposed to generate NH under the action of high temperature 3 The method comprises the steps of carrying out a first treatment on the surface of the The reaction of urea thermal decomposition is as follows:
(NH 2 ) 2 CO+H 2 O→2NH 3 +CO 2 ；
s2, ship tail gas and NH 3 Entering the columnar metal isolation net 9 to contact with the SCR catalyst 8 to generate an SCR reaction, wherein the reaction formula is as follows:
Figure BDA0004103237110000061
Figure BDA0004103237110000062
Figure BDA0004103237110000063
the tail gas after reaction radially enters the exhaust passage 7, the contact area between the gas and the SCR catalyst 8 can be enlarged in a radial entering mode, meanwhile, the damage of uneven pressure to the SCR catalyst 8 can be reduced due to the air inlet mode;
s3, moving the gas in the exhaust passage 7 to a plasma ionization assembly for ionization; n in plasma ionization part ship tail gas 2 O, plasma decomposition N 2 The reaction of O is as follows: e, e - +N 2 O→N 2 +O+e -
S4, tail gas after ionization and N 2 The O-catalytic decomposition catalyst 13 is discharged from the gas outlet passage of the housing 6 after reaction. N (N) 2 O catalytic decomposition reaction is 2N 2 O→2N 2 +O 2 。
The embodiments of the invention disclosed above are intended only to help illustrate the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention.

Claims (10)

1. The utility model provides a marine engine tail gas pollutant processing apparatus which characterized in that: comprises a urea supply mechanism, a selective reduction component, a shell (6), an exhaust passage (7), a plasma ionization component and N 2 O catalytic decomposition catalyst (13), urea outlet end syntropy setting up in the air inlet channel of casing (6) of urea feed mechanism, coaxial setting up selective reduction subassembly in casing (6), casing (6) inner wall encloses with selective reduction subassembly outer wall and closes and form exhaust passage (7), exhaust passage (7) and the air outlet channel intercommunication of casing (6), exhaust passage (7) are equipped with N with the intercommunication department of casing (6) 2 O-catalyzed decomposition catalyst (13), said N 2 The O catalytic decomposition catalyst (13) and the shell (6) are coaxially arranged, the selective reduction component is used for receiving a gas mixture after the reaction of the gas conveyed from the air inlet channel of the shell (6) and urea and conveying the gas mixture into the exhaust channel (7) along the radial direction of the shell (6), the SCR catalyst (8) is arranged on the inner wall of the selective reduction component, a plurality of plasma ionization components are arranged at the tail end of the exhaust channel (7) along the circumferential direction of the shell (6), and the plasma ionization components are used for ionizing the gas.
2. The marine engine exhaust gas pollutant treatment device according to claim 1, wherein: the shell (6) is a hollow revolving body, the shell (6) comprises an air inlet channel, a treatment channel and an air outlet channel, the pipe diameters of the air inlet channel and the air outlet channel of the shell (6) are smaller than those of the treatment channel, and the selective reduction assembly is arranged in the treatment channel.
3. A marine engine exhaust gas pollutant treating device according to claim 2, in which: the N is 2 The O catalytic decomposition catalyst (13) is hollow and tubular, and the N is 2 The O catalytic decomposition catalyst (13) is arranged in a transition zone where the pipe diameter of the treatment channel gradually narrows towards the pipe diameter of the gas outlet channel.
4. A marine engine exhaust gas pollutant treatment device according to claim 1, 2 or 3, in which: the urea feeding mechanism comprises a urea injection assembly (1), an electronic control valve (2) and a urea storage assembly (3), wherein the output end of the urea storage assembly (3) is communicated with the urea injection assembly (1) through the electronic control valve (2), and the urea outlet end of the urea injection assembly (1) is arranged in an air inlet channel of a shell (6) in the same direction.
5. The marine engine exhaust gas pollutant treating device according to claim 4, wherein: the selective reduction assembly is a rotator.
6. A marine engine exhaust gas pollutant treating device according to claim 1, 2, 3 or 5, characterized in that: the selective reduction assembly further comprises a first sealing baffle (4), a columnar metal isolation net (9) and a second sealing baffle (12), the columnar metal isolation net (9) is cylindrical, the first sealing baffle (4) is arranged at the edge of the opening on one side of the columnar metal isolation net (9) close to the air inlet channel of the shell (6), the first sealing baffle (4) is annular, the outer edge of the first sealing baffle (4) is connected with the inner wall of the shell (6), the opening on the other side of the columnar metal isolation net (9) is provided with the second sealing baffle (12), and the SCR catalyst (8) is arranged on the inner side net surface of the columnar metal isolation net (9).
7. The marine engine exhaust gas pollutant treating device according to claim 6, wherein: the selective reduction assembly further comprises a backflow prevention plate (5), and the backflow prevention plate (5) is arranged at an opening part of the columnar metal isolation net (9) close to one side of the air inlet channel of the shell (6).
8. The marine engine exhaust gas pollutant treatment device according to claim 1, wherein: the plasma ionization assembly is provided with two.
9. The marine engine exhaust gas pollutant treating device according to claim 8, wherein: the plasma ionization device comprises an arc-shaped outer electrode (10) and an arc-shaped inner electrode (11), wherein the arc-shaped outer electrode (10) is arranged on the outer wall of the shell (6), and the arc-shaped inner electrode (11) is arranged in the exhaust passage (7).
10. A ship engine exhaust gas pollutant treatment method using a ship engine exhaust gas pollutant treatment device according to any one of claims 1, 2, 3, 5, 7, 8 or 9, comprising the steps of:
s1, urea is injected by a urea supply mechanism while ship tail gas enters from an air inlet channel of a shell (6), and is decomposed into NH 3 ；
S2, ship tail gas and NH 3 Enters a columnar metal isolation net (9) to be in contact reaction with an SCR catalyst (8) and then radially enters an exhaust passage (7);
s3, moving the gas in the exhaust passage (7) to a plasma ionization assembly for ionization;
s4, ionized gas and N 2 The O-catalyzed decomposition catalyst (13) is discharged from the gas outlet channel of the shell (6) after reaction.
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