CN108404666A - A kind of marine diesel tail gas denitrification apparatus - Google Patents
A kind of marine diesel tail gas denitrification apparatus Download PDFInfo
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- CN108404666A CN108404666A CN201810185938.3A CN201810185938A CN108404666A CN 108404666 A CN108404666 A CN 108404666A CN 201810185938 A CN201810185938 A CN 201810185938A CN 108404666 A CN108404666 A CN 108404666A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of marine diesel tail gas denitrification apparatus comprising one end of babinet, the babinet is connect with boat diesel engine offgas outlet, and the other end leads to air；Plasma purification module and light catalytic purifying module are provided in babinet, which includes the several groups plasma reactor being arranged in parallel；The light catalytic purifying module has plate armature, including several ultraviolet lamp tubes disposed in parallel and photocatalysis membrana.The denitrification apparatus of the present invention uses box shape, is arranged convenient for cabin and fixed, and processing flow is up to 0.28 m3/ s meets boat diesel engine exhaust emissions traffic requirement, and the residence time of tail gas in a device is up to 3.5 s, ensure that higher denitration process efficiency.Apparatus of the present invention energy-saving and environmental protection, the denitrification rate of the purification simulation marine diesel tail gas of laboratory small testing device are up to 80% 90%.
Description
Technical field
The present invention relates to a kind of marine diesel tail gas denitrification apparatus, and in particular to a kind of low temperature plasma and photocatalysis
The marine diesel tail gas denitrification apparatus of technical tie-up effect.
Background technology
Pollution From Ships, which are emitted in traffic moving source, occupies important proportion.Compared with motor vehicle source, though Pollution From Ships source
Total emission volumn is less, but boat diesel engine has oil consumption height, pollutant single machine discharge capacity big using heavy oil and diesel oil as main fuel
The features such as.NOx in marine diesel tail gas can generate serious danger to organs such as the respiratory system of human body, heart, liver, kidneys
Evil, while still causing one of the principal element of acid deposition and photochemical fog.
The NO that diesel engine generatesXThere are three types of types, are wink hair style (Prompt NOX), fuel type (Fuel NO respectivelyX) with
And heating power type (Thermal NOX).Thermal NOXRefer to the N under high-temperature oxygen-enriched burning condition2And O2Combination reaction occurs to be given birth to
At NOX.When correlative study shows that engine air in-cylinder combustion temperature is more than 2000K, heating power type is NOXMainly generate approach.
In order to make diesel engine that there is high power density and good economy, its general ignition temperature can all be far above 2000K.Therefore ship
NO in vessel exhaustXSource be mainly diesel engine generate thermal NOX, main component is NO and NO2, other nitrogen oxides contain
It measures atomic.
Lower temperature plasma technology (Non-thermal plasma) and photocatalysis technology (Photocatalysis) conduct
Gas pollutant administered the hot spot technology in field in recent years, was paid close attention to by extensive scientific research, and the two also takes in terms of NO purifications
Obtained good effect.However, technical problems such as that there are side reactions are more for Low Temperature Plasma Treating technology, and energy consumption is higher.It grinds
Study carefully discovery, low temperature plasma and photocatalysis technology is used in combination, is then considered as solving this kind of ask in polluted gas processing procedure
The effective way of topic.
Through the literature search of existing technologies, the Chinese patent of Publication No. CN101024148A discloses a kind of light
The integrated motor-vehicle tail-gas purifying device of catalyzing cooperation action of plasma, the device use the electric discharge knot of parallel coaxial casing
Structure, ceramic tube housing surface carried titanium dioxide, inner and outer pipes form electrode lay-out.But the invention is used for handling motor-driven vehicle
Gas, gas flow is small, and the gas light-catalysed reaction time is short, and only 0.5s, gas purification efficiency can not ensure.In retrieval also
It was found that the Chinese utility model patent of Publication No. CN2660374 discloses a kind of gas purifier, the clarifier using etc. from
Daughter coupling photo catalytic unit block, it is to have loaded light to urge that, which there are rigid electrolyte barrier, one of electrode used therein in electrode inside,
The tabular porous body of agent.Although the device has preferable catharsis to air, since the gas of the device will be through
It crosses a zigzag to turn to, to increase the resistance of air-flow, while the processing technology of electrode is complicated, increases manufacturing cost.And
The common feature of above-mentioned two patent is that with plasma using integral structure, the two shares a cavity for photocatalysis,
Exhaust gas is simultaneously by plasma and light-catalysed oxidation, but there are plasmas and light-catalysed specific reaction condition punching
The problem of prominent and unripe theory support.
Invention content
The goal of the invention of the present invention is, overcomes existing plasma and photocatalysis technology that existing technology is used in combination and lacks
Fall into, provide it is a kind of it is simple in structure, at low cost, the tail gas residence time is long, gas flowfield is unobstructed, a kind of photocatalysis of good purification
With the marine diesel tail gas denitrification apparatus of the separate layout structure of lower temperature plasma technology synergy.
In order to achieve the above object, the present invention provides a kind of marine diesel tail gas denitrification apparatus, it includes：Babinet,
One end of the babinet is connect with boat diesel engine offgas outlet, and the other end leads to air；It is net that low temperature plasma is provided in babinet
Change module and light catalytic purifying module, which includes the several groups plasma reaction being arranged in parallel
Device；The light catalytic purifying module has plate armature, including several ultraviolet lamp tubes disposed in parallel and photocatalysis membrana.
Preferably, the plasma purification module includes the several groups plasma reactor being arranged in parallel.
Preferably, the plasma purification module also includes center and pillar, the plasma reactor
It is fixed, is arranged in center by pillar, one entirety of formation crosses gas section.
Preferably, the plasma purification module includes 10-50 group plasma reactors.
Preferably, the plasma reactor includes：Insulating plug, air inlet, central electrode, grounding electrode and pipe
Shell, wherein insulating plug is arranged at the both ends of shell, and air inlet and central electrode are arranged in shell, and grounding electrode is arranged in pipe
The outer wall of shell, ground connection.
Preferably, the plasma reactor has single dielectric quartz pipe barrier discharge structure, shell is quartz ampoule.
Preferably, the photocatalysis membrana is supported on titanium-base, supported titanium is selected2Photocatalysis membrana or support type
TiO2/ Ti photocatalysis membranas.
Preferably, the supported titanium2Photocatalysis membrana is using sol-gal process in titanium plate area load nanoscale
Titanium dioxide, titanium dioxide are in the Anatase structure of tetragonal crystal system, and the average-size of crystal grain is about 31.20nm.
Preferably, the length of the titanium-base is less than the height of babinet, which is alternately fixed on the top of babinet
Or bottom so that the flow field of gas is in " S " font in babinet.
The device of the invention processing flow is up to 0.28m3/ s meets boat diesel engine exhaust emissions traffic requirement, and tail gas exists
Residence time in device is up to 3.5s, ensure that higher denitration process efficiency.Apparatus of the present invention are simple in structure, it is at low cost,
Energy-saving and environmental protection.
Description of the drawings
Fig. 1 is the marine diesel tail gas denitrification apparatus schematic diagram of low-temperature plasma of the present invention and photocatalysis synergy.
Fig. 2 is the reaction of low temperature plasma device structural schematic diagram of apparatus of the present invention.
Fig. 3 a are the reaction of low temperature plasma device assembled arrangement pattern of apparatus of the present invention and the section of module global design
Figure；Fig. 3 b are the reaction of low temperature plasma device assembled arrangement pattern of apparatus of the present invention and the front view of module global design.
Fig. 4 is the photo catalysis reactor internal gas Streamline Design figure of apparatus of the present invention.
Fig. 5 is the XRD diffracting spectrums of the photocatalysis membrana of apparatus of the present invention.
Fig. 6 is the surface topography of the photocatalysis membrana of apparatus of the present invention.
Fig. 7 is the photocatalysis module global design figure of apparatus of the present invention.
Fig. 8 is the system flow chart of apparatus of the present invention purification simulation diesel engine vent gas.
Specific implementation mode
Below in conjunction with drawings and examples, the following further describes the technical solution of the present invention.
As shown in Figure 1, for a kind of separate type cloth by low temperature plasma and photocatalysis technology synergy of the present invention
Set the marine diesel tail gas denitrification apparatus of structure comprising the daughters such as low temperature of separate layout clean unit 30 and photocatalysis
Clean unit 40.Wherein, air inlet 10 is connect with boat diesel engine offgas outlet；Exhaust outlet 20 is connected to air.Air inlet 10
Diameter design is 85mm, consistent with exhaust duct of diesel engine diameter, and the expansion of front and back end and contraction length of tube are 200mm.This is de-
Nitre device uses box shape, is arranged convenient for cabin and fixed, and the processing flow according to ship operating condition design device is 0.28m3/
s.In view of the electrode arranged in device and ultraviolet lamp etc., design box sizes are 1.5m*0.82m*0.82m, in addition air inlet
The volume 0.4m of contraction section3, so box body device total volume is 1.4m3。
The plasma cleaning unit module considers pressure, the cost of processing equipment and stabilization in reaction unit
Property, the present invention selects the reaction of low temperature plasma device of single dielectric barrier discharge structure, with simple in structure, generation plasma
The uniform feature of body.Dielectric barrier discharge is that insulant is added among two pieces of electrodes, applies High Level AC Voltage, electrode on electrode
Between air breakdown ionization under action of high voltage, generate plasma.According to medium and electrode combination form, can be divided into
3 kinds：(1) unilateral single-layer medium blocking, low manufacture cost simple in structure and technology maturation, and metal electrode is conducive to reaction heat
The diffusion of amount；(2) two-layered medium stops, the plasma for generation of discharging effectively prevents reactant and electricity among two layer medium
The contact of pole causes to corrode to electrode.(3) middle single-layer dielectric impedance, medium both sides can generate plasma, Er Qieneng
Electrical breakdown is enough avoided to generate electric spark.The generation plasma that this three kinds of structures can be stablized at normal temperatures and pressures.The application adopts
It is (3) kind, quartz ampoule is as middle single-layer block media.
The plasma reactor configurations, referring to Fig. 2, including：Insulating plug 311, plasma reactor air inlet
312, central electrode 313, grounding electrode 314 (external electrode), quartz ampoule 315.Hv (High voltage) refers to power supply in figure
High-pressure side.Wherein, central electrode 313 is stainless steel bar, a diameter of 8.5mm, as high-field electrode；Grounding electrode (external electrode)
314 be nickel coating, is close to quartzy pipe outer wall, and it is grounded；The outer diameter of quartz ampoule 315 is 20mm, internal diameter 17mm, as low
The block media of isothermal plasma device.There is the gap area of 8.5mm between quartz ampoule and central electrode, the region is as low temperature
Plasma reaction region of discharge, electric discharge section length are 460mm, and plasma reactor overall length is 500mm.
When the reaction of low temperature plasma device is used to handle the nitrogen oxides in diesel engine vent gas, diesel engine is fully considered
Discharge duct parameter is unlikely to cause the apparent rising of exhaust back pressure after installing reactor, so the reactor of design needs to protect
The sectional area of the whole circulation plasma module of card is more than the sectional area of exhaust duct of diesel engine.Exhaust duct of diesel engine is a diameter of
85mm, i.e. discharge duct actual internal area are 56.72cm2；The actual internal area of individual plasma reactor is 2.27cm2, therefore
And the plasma reactor group number needed is 25 groups.
25 groups of plasma reactors 31 be combined into plasma process modules with ensure it is whole cross gas section (that is,
The flow area of gas).Using combination in parallel, 25 groups of plasma reactors 31 are installed to single unit system center 32
In, it is supported and is fixed by pillar 33.Type of array and module global design are referring to Fig. 3 a and 3b, wherein 3a is sectional view, and 3b is
Front view.
The structure design of the photocatalysis module, it is contemplated that equipment cost and technology maturation, preferably flat reaction dress
It sets.The denitration process efficiency for installing small scale process plant is taken into account on ship simultaneously in limited the space in, present invention employs it is efficient,
" S " font (or "the" shape, be the shape in gas interior flow field) box photocatalysis treatment device of technology maturation, is come with this
Contact area and the residence time for increasing tail gas and photocatalysis membrana, to promote denitration efficiency.The photocatalysis of apparatus of the present invention is anti-
Answer device internal gas Streamline Design referring to Fig. 4.
In some embodiments, the photocatalysis module using active strong, long lifespan and it is anticorrosive the features such as load
Type photocatalytic titania film.The load type titanium dioxide photocatalytic film is in titanium plate using sol-gal process (as load base
Bottom) about 1.5 μm of one thickness of area load nanoscale titanium dioxide formed.Specifically, load type titania light
The preparation process of catalytic membrane includes as follows：
1) supporting substrate pretreatment
By the titanium plate of 0.2mm thickness alkalinity Na2CO3Solution impregnates 30 minutes or more, to remove surface and oil contaminant；Take out backlash
Wash clean；It is impregnated with 10% oxalic acid solution, boils 1h or more, until titanium plate surface becomes grey and loses metallic luster.It takes out
After clean up and dry.
Oxalic acid is act as in the present invention：Oxalic acid can be carried as drying control chemical additive in film forming procedure
The attachment dynamics of high titanium dioxide and titanium plate reduces crackle, while can increase service life；Titanium dioxide can be held by core of oxalic acid
Begin to crystallize, crystallization temperature can be substantially reduced, avoids and the mechanical performance that substrate generates is damaged due to high-temperature heat treatment；Pass through
Control thin film precursor medium-height grass acid content can quickly prepare the film of different-thickness.
2) preparation of colloidal sol
The acetylacetone,2,4-pentanedione of the butyl titanate and 3ml of 10ml is quickly added under stirring to 70ml normal propyl alcohols.It is slow to stand a moment
Slow that 4ml distilled water is added, sonic oscillation 20 minutes makes it be uniformly dispersed.Then 0.785g oxalic acid powder is added while stirring, until
All dissolvings.It is protected from light standing 48h or more at room temperature, carries out ripening, until colloidal sol becomes laking.
3) colloidal sol coats
By colloidal sol sonic oscillation 20min, the titanium plate that step 1) obtains is dipped in colloidal sol, at the uniform velocity with the speed of 1cm/min
Lifting comes out, the dry 20min or more under room temperature or infrared lamp.
4) it is sintered
Muffle furnace is put into after film drying, temperature is set in 400 DEG C, keeps 1h, is then shut off heating, is cooled in stove
It is taken out after room temperature, completes sintering.
It repeats colloidal sol coating and is sintered the nanometer titanium dioxide that 4 times are about 1.5 microns in titanium plate area load a layer thickness
Titanium crystal.
In some embodiments, ultraviolet lamp tube select be power be 150W, length is the U-shaped mercury lamp of 800mm low pressure.
In some embodiments, the photocatalysis membrana is supported titanium2/ Ti photocatalysis membranas, ingredient are Ti and TiO2It is mixed
It is fit；And TiO prepared by sol-gal process2In the Anatase structure of tetragonal crystal system, the average-size of crystal grain is about
31.20nm being nano-scale photocatalyst.The photocatalysis membrana XRD diffracting spectrums, referring to Fig. 5.The surface shape of the photocatalysis membrana
Looks are referring to Fig. 6 (a, b are respectively represented observes its microstructure morphology under 5000 times and 3000 times of scanning electron microscope), this hair
The photocatalysis membrana face crack of bright use is evenly distributed, and is cross-linked to each other, and compact and complete state, no long crack is presented.It is good
Surface topography provides guarantee for the denitration efficiency of photocatalysis module.
The plate armature of the photocatalysis module, setting layout is referring to Fig. 7.Ultraviolet lamp tube cloth parallel with photocatalysis membrana
It sets, ultraviolet lamp tube is fixed with photocatalysis membrana overall structure.Fluorescent tube distance d between photocatalysis membrana is designed as 75mm, and two blocks of light are urged
The spacing for changing film is 150mm.The length of the titanium-base of the load photocatalysis membrana is less than the height of babinet, titanium-base alternating
It is fixed on the top or bottom of babinet so that the flow field of gas is in " S " font in babinet.
The whole device necessary accessories are as follows：25 sets of plasma reactor, it is in parallel；150W ultraviolet lamps 16, mating stone
English casing 16,16,95-155W ballasts；Support type 80cm*60cm photocatalytic titania films 8.Low temperature plasma
Power is 3KW, and the design power of whole device is 6KW.
The basic principle of the low-temperature plasma module denitration is：Containing big in the low temperature plasma that gas discharge generates
The high energy electron (e*) of amount, excited state particle, ion, elemental oxygen (O), ozone, oxidisability extremely strong free radical (OH*, HO2*)
Isoreactivity particle achievees the purpose that purify emission to cause a series of chemical reaction.The chemical equation of its basic principle
Formula is：
N2+e*→2N+e
NO+e*→N+O+e
N+NO→N2+O
O+NO+M→NO2+M
The half for the NO being removed converts for NO2, the other half conversion is for N2。
The basic principle of the photocatalysis module denitration is：Semi-conducting material when illuminated, if absorbed light is sub
Energy is more than forbidden band bandwidth (Eg), and the electronics in valence band will become light induced electron (e to conduction band transitions-) and stayed in valence band
Under positively charged hole (h+).Light induced electron has strong reducing property, and hole can attract electronics that there is strong oxidizing property, the two to be formed
Redox system can be catalyzed the generation of other chemical reactions.During photocatalysis removes NO, be not NO directly and photoproduction
Carrier, which combines, to be aoxidized, but O2、H2As reactant absorption, reaction, desorption process occur for O etc., generate OH, O2 -Deng work
NO can be oxidized to NO by property group, these active groups2And it removes.The chemical equation of its basic principle is：
H2O+h+→·OH+H+
NO+·OH→HNO2
HNO2+·OH→NO2+H2O
NO2+·OH→HNO3
Low temperature plasma of the present invention and the basic principle of photocatalysis synergy denitration are：Diesel engine vent gas by it is equal from
Daughter reactor, it is fast using plasma reaction rate, be suitble to the advantages of processing high concentration, by the concentration of NO be reduced to one compared with
Low level；Then the tail gas of this relatively low NO concentration is reacted by photo catalysis reactor, the efficiency of light-catalyzed reaction obtains
To raising.By Combined Treatment, have complementary advantages, NO removal efficiencies are greatly improved.
Apparatus of the present invention use box shape, are arranged convenient for cabin and fixed.Apparatus of the present invention processing flow is up to
0.28m3/ s meets boat diesel engine exhaust emissions traffic requirement, and the residence time of tail gas in a device is up to 3.5s, ensure that
Higher denitration process efficiency.Apparatus of the present invention are simple in structure, at low cost, energy-saving and environmental protection.
Embodiment 1：It is filled with the diesel engine vent gas denitration of the present embodiment low temperature plasma and photocatalysis technology synergy
Set processing cold-stat e simulation flue gas
Test condition：System uses cold-stat e simulation flue gas, realization method as shown in Figure 8.In Fig. 8, air air source 1, O2Steel
Bottle 2, NO steel cylinders 3, N2Steel cylinder 4 is respectively air, oxygen, nitric oxide and Nitrogen source gases；Pressure reducing valve 5 is gas drop in steel cylinder
Pressure, while it is equal to ensure that outlet is pressed；Enter outspoken twist-on head 6 to dock with hose, can guarantee air-tightness and interface bearing capacity；
Inlet ball valve 7, for controlling each gas flow；Spinner flowmeter 8 is for adjusting and monitoring gas flow；Three-way interface 9, is used for
Control inlet gas is divided into two-way, enters all the way after gas mixer 13 mixes and is discharged, can be expelled directly out all the way；Humidity regulation
Humidity of the bottle 10 for adjusting and controlling simulated flue gas in gas mixer；Oil bath pan (dimethicone) 11 is for adjusting and controlling
The temperature of simulated flue gas in gas mixer processed；Check valve 12, for preventing pressure change from causing gas backflow；Each component gas
It is used as simulated flue gas discharge after being mixed by gas mixer 13；Delivery gauge 14 is used for real-time display outlet pressure；Go out
Mouth ball valve 15 is for adjusting exit flow size；The effect for going out outspoken twist-on head 16 is identical as into outspoken twist-on head 6；Emergent emptying
Valve 17 is for emergent emptying.
Simulated flue gas is mixed by steel cylinder gas, respective flow is controlled by pressure reducing valve and flowmeter, in gas mixer
Inside match out the cold-stat e simulation flue gas of required concentration.
The simulation dynamic air-distributing is mainly by NO gas circuits, O2Gas circuit, N2Gas circuit and humidifying air gas circuit composition.NO gas circuits, O2
Gas circuit, N2Gas circuit provides NO gases, O respectively2Gas and N2Gas；Humidifying air gas circuit is the adjuster of temperature and humidity.Compression
Air pass through humidity regulation bottle and heater (dimethicone oil bath pan), then with NO, O2、N2It is mixed in gas mixer, to
Adjust and control the humidity and temperature of simulated flue gas in gas mixer.The numerical value of temperature and humidity is connect by Reactor inlet sampling
Thermometer and hygrometer at head are read.Each source outlet is connected on gas mixer, and end pressure is identical, slightly above marks
Quasi- atmospheric pressure.
The cold-stat e simulation flue gas operating mode, 20 DEG C of simulated flue gas temperature holding, humidity 20%, simulated flue gas flow are
120L/min ensures that residence time of the gas in system is more than 3.5s, and the initial concentration for testing NO is 100ppm, 200ppm,
300ppm, 400ppm, 500ppm and 600ppm.
Test result：The removal efficiency of NO is declined with the raising of initial NO concentration, but total removal efficiency between
Between 82%-88%, denitrification rate is relatively high.
Embodiment 2：It is filled with the diesel engine vent gas denitration of the present embodiment low temperature plasma and photocatalysis technology synergy
Set processing thermal simulation flue gas
Test condition：The thermal simulation flue-gas temperature is respectively set as 150 DEG C, 180 DEG C and 200 DEG C, humidity 20%,
Simulated flue gas flow is 120L/min, ensures that residence time of the gas in system is more than 3.5s, the initial concentration for testing NO is
300ppm。
Test result：Under three kinds of test temperatures, the denitrification rate that can be obtained is respectively：80%, 85% and 90%.
The combination of low-temperature plasma body unit and photocatalysis unit can be selected according to the size of the discharge capacity of boat diesel engine
Number.It is can also be applied to boat diesel engine exhaust in oxysulfide, hydrocarbon purification and motor-driven vehicle
The purification of gas and room air.
In conclusion tail gas denitrification apparatus provided by the invention includes babinet, one end and the marine diesel tail gas of babinet
Outlet connection, the other end lead to air, plasma purification module and light catalytic purifying module are provided in babinet；Low temperature etc.
Ion module is using single dielectric barrier discharge form, and central electrode is stainless steel bar, and dispatch from foreign news agency extremely nickel coating, quartz ampoule is blocking
Medium；Photocatalysis part is designed using load type titanium dioxide catalyst and plate armature, and flow field is in " S " type, increases tail gas
Contact area with photocatalysis membrana and residence time.Apparatus of the present invention use box shape, are arranged convenient for cabin and fixed.This hair
Bright device processing flow is up to 0.28m3/s and meets boat diesel engine exhaust emissions traffic requirement, when tail gas stop in a device
Between be up to 3.5s, ensure that higher denitration process efficiency.Apparatus of the present invention energy-saving and environmental protection, the purification of laboratory small testing device
The denitrification rate of simulation marine diesel tail gas is up to 80%-90%
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of marine diesel tail gas denitrification apparatus, which is characterized in that the device includes：Babinet, one end of the babinet and ship
Oceangoing ship diesel engine vent gas outlet connection, the other end lead to air；It is provided with plasma purification module in babinet and photocatalysis is net
Change module；The plasma purification module includes the several groups plasma reactor being arranged in parallel；The light is urged
Changing cleaning module has plate armature, including several ultraviolet lamp tubes disposed in parallel and photocatalysis membrana.
2. marine diesel tail gas denitrification apparatus as described in claim 1, which is characterized in that the plasma purification
Module also includes center and pillar, and the plasma reactor is fixed by pillar, is arranged in center, and formation one is whole
Body crosses gas section.
3. marine diesel tail gas denitrification apparatus as claimed in claim 2, which is characterized in that the area for crossing gas section is big
In the sectional area of exhaust duct of diesel engine.
4. marine diesel tail gas denitrification apparatus as described in claim 1, which is characterized in that the plasma purification
Module includes 10-50 group plasma reactors.
5. marine diesel tail gas denitrification apparatus as described in claim 1, which is characterized in that the plasma reactor
Including：Insulating plug, plasma reactor air inlet, central electrode, grounding electrode and shell, wherein insulating plug is arranged in pipe
The both ends of shell, plasma reactor air inlet and central electrode are arranged in shell, and the outer wall in shell is arranged in grounding electrode,
And it is grounded.
6. marine diesel tail gas denitrification apparatus as claimed in claim 5, which is characterized in that the plasma reactor
With single dielectric quartz pipe barrier discharge structure, shell is quartz ampoule.
7. marine diesel tail gas denitrification apparatus as described in claim 1, which is characterized in that the photocatalysis membrana is supported on
On titanium-base, supported titanium is selected2Photocatalysis membrana or supported titanium2/ Ti photocatalysis membranas.
8. marine diesel tail gas denitrification apparatus as claimed in claim 7, which is characterized in that the supported titanium2Photocatalysis
Film is the titania in titanium plate area load nanoscale using sol-gal process, and titania is in tetragonal crystal system
Anatase structure.
9. marine diesel tail gas denitrification apparatus as claimed in claim 8, which is characterized in that the titania is put down
Equal grain size is 31.20 nm.
10. marine diesel tail gas denitrification apparatus as claimed in claim 7, which is characterized in that the length of the titanium-base
Less than the height of babinet, which is alternately fixed on the top or bottom of babinet so that the flow field of gas is in " S " word in babinet
Shape.
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| CN109908752A (en) * | 2019-04-28 | 2019-06-21 | 陈小龙 | A kind of environmental protection emission-control equipment |
| CN110026056A (en) * | 2019-05-30 | 2019-07-19 | 李敏 | It is a kind of can Rapid Cleaning electrode low-temperature plasma waste gas treatment equipment |
| CN112985943A (en) * | 2021-02-25 | 2021-06-18 | 交通运输部天津水运工程科学研究所 | Based on boats and ships tail gas plume SO2Monitored pretreatment device |
| CN113176374A (en) * | 2021-04-26 | 2021-07-27 | 四川大学 | Photocatalytic denitration test system and use method thereof |
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