CN106076090A - A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx - Google Patents
A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx Download PDFInfo
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- CN106076090A CN106076090A CN201610638503.0A CN201610638503A CN106076090A CN 106076090 A CN106076090 A CN 106076090A CN 201610638503 A CN201610638503 A CN 201610638503A CN 106076090 A CN106076090 A CN 106076090A
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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
- B01D53/14—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 absorption
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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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
Abstract
A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx, belong to Air Pollution Control and environmental chemical engineering technical field, the processing procedure of the method is the air-flow gatherer of gas containing nitrogen oxide, positive and negative (or normal incidence or negative ground) being provided with in described device multi-group electrode pair alternately, and connect with high voltage power supply, transient switching electric discharge between positive and negative electrode is caused to make ambient gas ionize from absorbing liquid spray thrower sulfuric acid absorption liquid drop out and electrode contact, formed by high energy electron, in the gas-to-liquid contact discharge plasma district of the composition such as atom and free radical, described air-flow is through described discharge plasma district, oxidized and the described absorbing liquid of nitric oxide gas in air-flow absorbs, removed from air-flow.
Description
Technical field
The present invention relates to the method and apparatus that a kind of discharge plasma works in coordination with absorbing NOx, belong to atmospheric pollution control
System and environmental chemical engineering technical field.
Background technology
Nitrogen oxides (the NO that mankind's activity producesx) mainly include NO and NO2, wherein accounted for 90% by what fuel combustion produced
Above, next to that industrial process such as nitric acid production, chemical pharmaceutical, metal surface and semiconductor processes.People is had intoxicating to make by NOx
With, substantial amounts of discharged nitrous oxides still causes the one of the main reasons of atmospheric photochemistry mist and acid rain.Chinese environmental situation is public
Report statistical data shows that in China's Urban Acid Rain, the contribution of nitrogen oxides is being continuously increased, and the Acid Rain Pollution character in some places is
Start by sulfuric acid type to the ever-increasing compound conversion of nitrate ion (national environmental protection portion: Chinese environmental situation was public in 2010
Report).In recent years, country has newly formulated some laws, regulation, the nitrogen oxygen to combustion process discharges such as nitrogen oxides particularly thermoelectricitys
Compound has been made stricter control and has reduced discharging regulation.
Usually, the nitrous oxides concentration in the flue gas that thermal power plant etc. produce with combustion of fossil fuel is about hundreds of arriving
Thousand of mg/m3, wherein 95% it is above nitric oxide.Selective catalysis conversion method (SCR) is the main of improvement flue gas NOx at present
One of means, but service condition is required strict by catalyst, needs ammonia as reducing agent, contains sulfide, chloride in air-flow
Very big to the aging effects of catalyst with dust etc., particularly the highest to the operating cost of the thermal power plant with coal as fuel；Wet method
It is to use various liquid that NOx is absorbed, is the main method of discharged at lower temperature source process, mainly has oxidation absorption process and reduction
Absorption process two kinds, wherein oxidizing process is to use hydrogen peroxide, sodium hypochlorite and potassium permanganate etc. to inhale as oxidative absorption agent
Receipts process；Reducing process is to use sodium sulfite, sodium sulfide and carbamide etc. to carry out absorption process as reducing agent.But to containing an oxidation
The nitrogen oxides that nitrogen is more, owing to nitric oxide dissolubility in the solution is the least, absorption efficiency is relatively low, and medicament is more expensive, fortune
Row cost of use is high.Therefore, the purification techniques of research and development Novel flue gas nitrogen oxides, is to be badly in need of solving in this skilled industry application
Problem certainly.
The nonequilibrium plasma technology produced by gas discharges such as corona discharge pulses is applied to nitrous oxides exhaust gas and controls
Reason, its ultimate principle is to utilize corona discharge to produce a large amount of high energy electrons, atom and free radical.These high energy electrons, atom and
Free radical can react with nitrogen oxides molecule and makes it aoxidize or dissociate.Present invention applicant had once reported employing impulse electric corona puts
The electricity reactor removal experimental result to nitrous oxides exhaust gas, result of study is referring to " environmental science " (2006, Vol 1:19-23)
" Journal of Chemical Industry and Engineering " (2004, Vol 6:124-128) etc. report.
It is an object of the invention to design and the method and apparatus providing a kind of discharge plasma to work in coordination with absorbing NOx,
Absorb after making the nitrogen oxides contained in air-flow be aoxidized by gas discharge plasma.
Summary of the invention
The technical solution used in the present invention is: a kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx,
It is characterized in that the air-flow gatherer of gas containing nitrogen oxide, positive and negative (or normal incidence and negative ground) being provided with in described device
Multi-group electrode pair alternately, and connect with high voltage power supply, the absorbing liquid drop spraying out from absorbing liquid spray thrower connects with electrode
Touching and cause transient switching electric discharge between positive and negative (or normal incidence and negative ground) electrode to make ambient gas ionize, formation is by high energy electron, former
The gas-to-liquid contact discharge plasma district of the composition such as son and free radical, import from the gas access of described device one end is nitrogenous
The air-flow of oxide gas is oxidized to titanium dioxide through described discharge plasma district, the nitric oxide gas in air-flow
Nitrogen, is then absorbed by described absorbing liquid, is removed from air-flow, and the air-flow after purification is by being arranged on the device other end
Gas outlet discharges, and absorbing liquid can be recycled after the absorbing liquid circulatory pool of described device bottom is collected.
A kind of discharge plasma according to technique scheme works in coordination with the device of absorbing NOx, it is characterised in that institute
The structure of the device stated is similar to absorption tower, gas feed, gas distributor, gas-to-liquid contact discharge plasma district, gas go out
Mouth and absorbing liquid spray thrower and absorbing liquid feed system form.Described gas-to-liquid contact discharge plasma district is arranged on device
In the middle of tower body, by positive and negative (or normal incidence and negative ground) electrode alternately to forming, electrode is powered by high voltage power supply, described device
Two ends are provided with gas outlet after gas feed and purification, and described absorbing liquid spray thrower may be provided at the upper of described device
Portion, device bottom is provided with absorbing liquid circulatory pool and is connected with absorbing liquid spray thrower with circulating pump by pipeline, constitutes absorbing liquid and supplies
To system.Absorbing liquid after absorbing NOx also can not recycle, otherwise processed, specifically can production concentration after apparent absorption
Depending on.
Electrode structure of the present invention is generally symmetrical netted plate structure, it is possible to for pin-net formula, pin-board-like, line-net
Formula, line-line and line-board-like etc., can horizontal positioned also can be disposed vertically, specifically can, liquid stream gentle according to the planform of device
Dynamic direction is designed and determines.Electrode material is generally the metal of resistance to sulphuric acid of the well conductings such as rustless steel, titanium, zirconium, tantalum, lead and alloy
Material and related compound material, material property is about the same, described composite include rustless steel or titanio ruthenic oxide (or
Iridium), titanium dioxide, Lead oxide brown, the combination electrode such as manganese dioxide and tin ash, these composites the most also have necessarily
Catalysis oxidative function, oxidation of nitric oxide rate about more than 5% can be improved.As a example by screen electrode, mesh generally circular in cross section or
Polygon, mesh size should ensure that gas and/or liquid flow through, and flow resistance is little, and single mesh area typically should be at 0.03cm2With
On, preferably 0.2cm2-50cm2, depending on concrete visual device flow area size, when electrode network plate current is just moved by air-flow, single net
Hole area generally should be smaller than the 1/10 of flow area, two adjacent positive and negative electrodes distance generally more than 1mm, preferably 5mm-150mm,
Electrode is in addition to electric discharge working portion, and other parts make insulation processing, can use the insulation materials such as politef, nylon and pottery
Material.The power supply mode of the used electrode of the present invention includes direct current, pulse and exchanges, and wherein the voltage of direct current and pulse power supply is general
Being ± 1kV-± 200kV, wherein an electrode is earthing pole, and the pulse recurrence frequency of pulse power supply is generally more than 1Hz, preferably
10Hz-500Hz, frequency increases, and nitric oxide production oxygenation efficiency improves, and absorbance also improves, and pulse recurrence frequency is more than 500Hz
Time, less, the voltage of Alternating Current Power Supply is generally 1kV-200kV to actual effect increase rate, and frequency is generally more than 1Hz, preferably
10Hz-1000Hz, when frequency is more than 1000Hz, actual effect increase rate is less.Electrode applies voltage to be had with electrode spacing
Closing, interelectrode distance is the biggest, and applying voltage can be the highest, and general electrode distance often increases 10mm, and voltage can increase 5kV-10kV, electricity
Pressure high-energy release is big, and oxidation efficiency is high, and electrode is to the most, and input power is the biggest, and removal effect is the best.
The present invention uses sulfuric acid solution as absorbing liquid, and sulfuric acid concentration is 1%-98.5% (mass fraction, lower same), concentration
Height is a little the most preferably, and preferably 30%-90% is beneficial to nitric oxide production oxidation and absorption, and the boiling point of solution can be improved simultaneously,
Operating temperature can be high.Along with the carrying out absorbed, concentrated sulphuric acid also can absorb the portion of water in air-flow.The merit of described absorbing liquid
One of energy is that after making to contact conducting between absorption drop and positive and negative electrode during spray, electric discharge makes gas ionization, is formed by height
The gas-to-liquid contact discharge plasma district of the compositions such as energy electronics, atom and free radical, promotes nitric oxide production oxidation and absorption, inhales
Receiving liquid spray and include that micropore drips spray or air-flow such as blows and sprays at the form, effect is suitable.Can be by regulation absorbing liquid spray flux and spray
Frequency regulates strength of discharge, can be continuous or interval spray, generally should be smaller than processed gas the interval time of interval spray
Body, specifically can be according to oxides of nitrogen gas negative in the physical dimension of device and air-flow in the time of staying in discharge plasma district
The parameter determinations such as lotus and absorbance requirement, processed gas is generally more than 0.3s in the time of staying in discharge plasma district,
The time of staying is the longest, and degradation effect is the best, preferably 3s-120s, and more than 120s, degradation effect increase rate diminishes.Described absorption
The two of the function of liquid are to use the sulphuric acid that concentration is higher can carry out at relatively high temperatures as absorbing liquid, absorption process, are absorbing
During typically will not produce steam, or a small amount of steam, absorbing liquid loss is little, and sulfuric acid concentration is the highest, and solution boiling point is high, work
Making temperature the highest, when general absorbing liquid sulfuric acid concentration is more than 20%, in tower, gas flow temperature can be more than 100 DEG C, high gas flow
Temperature is generally 200 DEG C, preferably less than 150 DEG C.Owing to Gas-Liquid Absorption is exothermic process, in order to improve absorption efficiency, can be to suction
Receive liquid and use condenser cooling, can make to control below 100 DEG C into tower absorbing liquid temperature.
After above-mentioned process, nitrogen oxides is nitrosylsulfuric acid by the primary product after sulfuric acid absorption, and product is dense in liquid phase
When spending low, absorbing liquid can be recycled, it is possible to does not recycles, and need to more renew absorbing liquid when general production concentration reaches 15%.
Owing to concentrated sulphuric acid absorbs in air to obtain moisture in absorption process the most simultaneously, gas flow temperature at 120 DEG C time, described sulfuric acid concentration is dilute
Release about 30% once time, can by be arranged on absorbing liquid circulatory pool bottom leakage fluid dram discharge, change higher concentration sulphuric acid
Absorbing liquid.Air-flow can carry out after dehumidification treatments device again described in enter in advance, and to improve assimilation effect, dehumidifying can be adopted
With the inorganic salt solids such as calcium chloride, magnesium sulfate, lithium chloride and lithium bromide or liquid or other dehumidizer adsorption and dehumidifications.
Air-flow of the present invention is mainly thermal power generation, smelt wait with combustion of fossil fuel produce containing nitrogen oxides
Flue gas, it is possible to be other industrial process produce relevant gas flow.The concentration of general nitrogen oxides in effluent is at 0.5% (volume
Content) below, during for nitrous oxides concentration in other industrial gas higher than 0.5% (volume content), it is also suitable institute of the present invention
The method stated.
The invention have the advantage that employing sulfuric acid absorption spray droplet contacts with the positive and negative electrode in device and is allowed to conducting to put
Electricity makes gas ionization, forms the plasma slab and processed nitrogen oxides being made up of high energy electron, atom and free radical etc.
Gas generation oxidation reaction, making oxidation of nitric oxide is to be absorbed by described absorbing liquid after nitrogen dioxide, thus reaches GAS ABSORPTION
Purpose, owing to using sulfuric acid solution as absorbing liquid, make the operating temperature can be more than 100 DEG C, and recoverable by-product
Nitrosylsulfuric acid.
Accompanying drawing explanation
Fig. 1 is the apparatus structure signal that a kind of discharge plasma of the present invention works in coordination with absorbing NOx gas
Figure.
Fig. 2 is the device mesh electrode knot that a kind of discharge plasma of the present invention works in coordination with absorbing NOx gas
Structure schematic diagram, positive-negative electrode structure is identical.
Fig. 3 is the horizontal type structure that a kind of discharge plasma of the present invention works in coordination with the device of absorbing NOx gas
Schematic diagram, upper figure is front view, and figure below is top view.
In figure: 1 circulating pump；2 circulating pump feed tubes；3 absorbing liquid circulatory pools；4 condensers；5 filling openings；6 gas feeds；7
Gas distributor；8 circulating pump drain pipes；9 electrode groups；10 inlets；11 gas outlets；12 demisters；13 absorbing liquid spray throwers；
The negative pole of 14 electrode groups；The positive pole of 15 electrode groups；16 leakage fluid drams；17 absorbing liquid collecting regions；18 communicating pipes；19 absorbing liquid circulatory pools
Liquid outlet；20 cooling coils.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment 1: a kind of discharge plasma of the present invention works in coordination with the device of absorbing NOx as shown in Figure 1.
Device is cylindrical shape, cylinder material PP, and overall dimensions is Ф 150mm × 1200mm, vertical placement.Electrode is as described in Figure 2
Disc mesh electrode, electrode material is nickel chromium stainless steel, punch forming, and mesh is rectangle, and electrode overall dimensions is Ф 140mm
× 2mm, single hole a size of 10mm × 10mm, interelectrode distance about 15mm, totally 12 groups.Electrode power supply mode is respectively direct current, arteries and veins
Rushing and exchange, wherein direct current and alternating voltage are each about 6kV, and a-c cycle is about 50Hz, and pulse voltage is about 8kV, pulse frequency
Rate about 50Hz, another electrode ground connection when direct current and pulse power supply, power the most about 100W.
Processing technique is that the air-flow of gas containing nitrogen oxide is entered described device by gas feed 6 through gas distributor 7
Gas-to-liquid contact discharge plasma district, the positive pole 15 of positive and negative mesh electrode group alternately is connected with high voltage power supply, netted
Negative pole 14 ground connection of electrode group or connect the power supply other end, starts circulating pump 1 and regulates flow, make absorbing liquid through condenser 4,
The absorption drop that circulating pump drain pipe 8, inlet 10 spray with absorbing liquid spray thrower 13 contacts with high-field electrode group and causes
Conducting electric discharge between positive and negative electrode, makes gas ionization, forms the gas-to-liquid contact being made up of high energy electron, atom and free radical etc. and puts
Electro-plasma district, when the air-flow of described gas containing nitrogen oxide is through described gas-to-liquid contact discharge plasma district,
Nitric oxide gas in air-flow is oxidized and absorbs, and is removed from air-flow, and the air-flow after purification passes through gas outlet 11
Discharging, the absorbing liquid sprayed passes through absorbing liquid feed system after the absorbing liquid circulatory pool 3 of described device bottom is collected
Recycle.
Experiment condition is: the carrier gas of oxides of nitrogen gas is air, and nitrogen oxides inlet concentration is about 500mg/m3(wherein
95% is nitric oxide), gas inlet temperature is 120 DEG C, gas flow about 3m3/h.Air-flow is at gas-to-liquid contact plasma discharging
The time of staying in body district is about 3s, gas relative humidity about 70%, absorbing liquid spray flux about 50L/h, and the condensed laggard tower of device 4 is inhaled
Receive liquid temp and be about 50 DEG C, spray about 2 times/s of frequency.Stable operation measured after 15min minute.Initial absorption liquid is 85% sulfur
Acid, absorbing liquid circulatory pool addition about 60kg.Experimental result obtains: when power supply mode is direct current, the outlet of nitrogen oxides is dense
Degree is 52mg/m3, when power supply mode is pulse, the exit concentration of nitrogen oxides is 44mg/m3, when power supply mode is for exchange,
The exit concentration of nitrogen oxides is 61mg/m3。
Embodiment 2: when gas flow temperature is respectively 60 DEG C, 100 DEG C, 150 DEG C and 180 DEG C, power supply mode is direct current, and other are real
Condition of testing is respectively 41mg/m with embodiment 1, the exit concentration obtaining nitrogen oxides3、47mg/m3、59mg/m3And 77mg/m3。
When gas flow temperature is 60 DEG C, solid calcium chloride or magnesium sulfate packed column is used to dehumidify in air-flow in advance, gas after dehumidifying
Relative humidity about 40%, then implement said process and obtain the exit concentration of nitrogen oxides and be about 35mg/m3。
Embodiment 3: initial absorption molten sulfur acid concentration is respectively 1%, 10% and 30%, and gas inlet temperature is about 90 DEG C
Time, power supply mode is pulse, and other experiment conditions are with embodiment 1.The exit concentration obtaining nitrogen oxides is respectively 175mg/m3、
133mg/m3And 103mg/m3。
Embodiment 4: when initial absorption molten sulfur acid concentration is respectively 50%, 70%, 90% and 98.3%, power supply mode is arteries and veins
Punching, other experiment conditions are with embodiment 1.The exit concentration obtaining nitrogen oxides is respectively 83mg/m3、57mg/m3、40mg/m3With
29mg/m3。
Embodiment 5: electrode material is titanio ruthenic oxide combination electrode, and gas flow is about 2m3/h.Air-flow connects in gas-liquid
The time of staying touching discharge plasma district is about 5s, absorbing liquid spray flux about 25L/h, sprays about 1 time/s of frequency.Electrode spacing
From about 30mm.Electrode power supply mode is pulse, and pulse voltage is about 15kV, pulse frequency about 80Hz.Other experiment conditions are with real
Execute example 1.Experimental result obtains: the exit concentration of nitrogen oxides is 35mg/m3。
Embodiment 6: a kind of discharge plasma of the present invention works in coordination with device such as Fig. 3 institute of absorbing NOx gas
Show.Apparatus main body is cuboid, material PP, body contours a size of 200mm × 150 × 450mm, horizontal placement.Electrode is
Rectangle mesh electrode, electrode material is nickel chromium stainless steel, punch forming, and mesh is rectangle, overall dimensions be 180mm ×
130mm × 2mm, single hole a size of 10mm × 10mm, interelectrode distance about 6-8mm, totally 12 groups, horizontal positioned.Electrode power supply side
Formula is direct current, and voltage is about 4kV, power about 100W.
Processing technique is that the air-flow of gas containing nitrogen oxide is entered described device by gas feed 6 through gas distributor 7
Gas-to-liquid contact discharge plasma district, the positive pole 15 of described positive and negative mesh electrode alternately is connected with high voltage power supply, institute
Negative pole 14 ground connection of the mesh electrode stated, starts circulating pump 1 getting off of regulating that flow makes that absorbing liquid spray thrower 13 sprays
Absorption drop contacts with high-field electrode and causes conducting electric discharge between positive and negative electrode, when the air-flow warp of described gas containing nitrogen oxide
When crossing described gas-to-liquid contact discharge plasma district, the nitric oxide in air-flow is oxidized and absorbs, and is gone from air-flow
Removing, the air-flow after purification is discharged by gas outlet 11 by after demister 12, and the absorbing liquid sprayed is through described device bottom
Absorbing liquid collecting region 17 collect after through being communicated to absorbing liquid circulatory pool 3 communicating pipe 18, condensed coil pipe 20 condenses, absorbing liquid is followed
Cisterna ambiens liquid outlet 19, circulating pump 1, circulating pump drain pipe 8 and inlet 10 recycle.
Experiment condition is: carrier gas is simulated flue gas, wherein oxygen about 8% (volume, lower same), carbon dioxide about 12%, water
Dividing about 10%, nitrous oxides concentration is 500mg/m3, flow about 3m3/ h, gas temperature about 120 DEG C.Air-flow discharges at gas-to-liquid contact
The time of staying of plasma slab is about 5s, and gas temperature is room temperature, absorbing liquid spray flux about 20L/h, spray frequency about 1 time/
s.Stable operation measured after 15min minute.Initial absorption liquid is 70% sulphuric acid, absorbing liquid circulatory pool addition about 60kg.Other
Condition is with embodiment 1.It is 54mg/m that experiment obtains the exit concentration of nitrogen oxides3。
Should be noted that above example is merely to illustrate technical scheme, protection scope of the present invention is not
It is limited to this.For a person skilled in the art, all within the spirit and principles in the present invention, to described in each embodiment
Technical scheme is modified, or portion of techniques feature therein is carried out any equivalent, amendment, changes and improvements etc.,
Should be included within the scope of the present invention.
Example 1.Experimental result obtains: the exit concentration of nitrogen oxides is 35mg/m3。
Embodiment 6: a kind of discharge plasma of the present invention works in coordination with device such as Fig. 3 institute of absorbing NOx gas
Show.Apparatus main body is cuboid, material PP, body contours a size of 200mm × 150 × 450mm, horizontal placement.Electrode is
Rectangle mesh electrode, electrode material is nickel chromium stainless steel, punch forming, and mesh is rectangle, overall dimensions be 180mm ×
130mm × 2mm, single hole a size of 10mm × 10mm, interelectrode distance about 6-8mm, totally 12 groups, horizontal positioned.Electrode power supply side
Formula is direct current, and voltage is about 4kV, power about 100W.
Processing technique is that the air-flow of gas containing nitrogen oxide is entered described device by gas feed 6 through gas distributor 7
Gas-to-liquid contact discharge plasma district, the positive pole 15 of described positive and negative mesh electrode alternately is connected with high voltage power supply, institute
Negative pole 14 ground connection of the mesh electrode stated, starts circulating pump 1 getting off of regulating that flow makes that absorbing liquid spray thrower 13 sprays
Absorption drop contacts with high-field electrode and causes conducting electric discharge between positive and negative electrode, when the air-flow warp of described gas containing nitrogen oxide
When crossing described gas-to-liquid contact discharge plasma district, the nitric oxide in air-flow is oxidized and absorbs, and is gone from air-flow
Removing, the air-flow after purification is discharged by gas outlet 11 by after demister 12, and the absorbing liquid sprayed is through described device bottom
Absorbing liquid collecting region 17 collect after through being communicated to absorbing liquid circulatory pool 3 communicating pipe 18, condensed coil pipe 20 condenses, absorbing liquid is followed
Cisterna ambiens liquid outlet 19, circulating pump 1, circulating pump drain pipe 8 and inlet 10 recycle.
Experiment condition is: carrier gas is simulated flue gas, wherein oxygen about 8% (volume, lower same), carbon dioxide about 12%, water
Dividing about 10%, nitrous oxides concentration is 500mg/m3, flow about 3m3/ h, gas temperature about 120 DEG C.Air-flow discharges at gas-to-liquid contact
The time of staying of plasma slab is about 5s, and gas temperature is room temperature, absorbing liquid spray flux about 20L/h, spray frequency about 1 time/
s.Stable operation measured after 15min minute.Initial absorption liquid is 70% sulphuric acid, absorbing liquid circulatory pool addition about 60kg.Other
Condition is with embodiment 1.It is 54mg/m that experiment obtains the exit concentration of nitrogen oxides3。
Should be noted that above example is merely to illustrate technical scheme, protection scope of the present invention is not
It is limited to this.For a person skilled in the art, all within the spirit and principles in the present invention, to described in each embodiment
Technical scheme is modified, or portion of techniques feature therein is carried out any equivalent, amendment, changes and improvements etc.,
Should be included within the scope of the present invention.
Claims (10)
1. the method that a discharge plasma works in coordination with absorbing NOx, it is characterised in that the air-flow of gas containing nitrogen oxide
Gatherer, positive and negative (or the normal incidence) being provided with in described device multi-group electrode pair alternately, and connect with high voltage power supply, from
Absorbing liquid spray thrower absorbing liquid drop out and electrode contact cause transient switching electric discharge between positive and negative electrode to make ambient gas
Ionization, is formed in the gas-to-liquid contact discharge plasma district being made up of high energy electron, atom and free radical etc., from described device
The air-flow that the gas access of one end imports is through described discharge plasma district, and the nitric oxide in air-flow is oxidized and described
Absorbing liquid absorb, removed from air-flow, the air-flow after purification by be arranged on the device other end gas outlet discharge.
Method the most according to claim 1, it is characterised in that described electrode group include net-net, pin-net, pin-plate, line-
Net, line-line or the one of line-plate structure combination, electrode material includes rustless steel, titanium, zirconium, tantalum, lead or alloy and is correlated with multiple
Condensation material, described composite includes rustless steel or titanio ruthenic oxide (or iridium), titanium dioxide, Lead oxide brown, titanium dioxide
The combination electrode such as manganese and tin ash.
Method the most according to claim 1 and 2, it is characterised in that described screen electrode, mesh is circular or polygon,
Single mesh area is at 0.03cm2Above.
Method the most according to claim 1 and 2, it is characterised in that the power supply mode of described electrode includes direct current, pulse
With exchange, wherein the voltage of direct current and pulse power supply generally ± 1kV-± 200kV, the pulse recurrence frequency of pulse power supply is
More than 1Hz, the voltage of Alternating Current Power Supply is 1kV-200kV, and frequency is more than 1Hz, and two adjacent positive and negative electrode distances are more than 1mm.
Method the most according to claim 1, it is characterised in that described absorbing liquid spray thrower includes that micropore drips spray or air-flow spray
Drench.
Method the most according to claim 1, it is characterised in that described absorbing liquid is sulfuric acid solution, concentration is 1-98.5%.
Method the most according to claim 1, it is characterised in that described gas flow temperature below 200 DEG C, electric discharge wait from
The time of staying in daughter district is more than 0.3s.
Method the most according to claim 1, it is characterised in that described air-flow uses calcium chloride, magnesium sulfate, chlorination in advance
Lithium and lithium bromide carry out dehumidification treatments as dehumidizer.
The device of method the most according to claim 1, it is characterised in that described device is by gas feed, gas distribution
Device, gas-to-liquid contact discharge plasma district, gas outlet, absorbing liquid spray thrower, absorbing liquid condenser and absorbing liquid feed system
Composition, the mesh electrode that described gas-to-liquid contact discharge plasma district is replaced by positive and negative (or normal incidence) is to forming, and electrode is by height
Voltage source is powered, and the two ends of described device are provided with gas outlet after gas feed and purification, described absorbing liquid spray thrower
Being arranged on the top of described device, device bottom is provided with absorbing liquid circulatory pool by pipeline, circulating pump, condenser and absorption
Liquid spray thrower connects, and constitutes absorbing liquid feed system.
The device of method the most according to claim 9, it is characterised in that described device can be vertical or horizontal, electrode
To can be with horizontal positioned or be disposed vertically.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638503.0A CN106076090A (en) | 2016-08-03 | 2016-08-03 | A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx |
| PCT/CN2017/087367 WO2017211280A1 (en) | 2016-06-08 | 2017-06-07 | Method and device using gas discharge technique and solution absorption technique to remove hazardous gas |
| CN201710450142.1A CN107398144B (en) | 2016-06-08 | 2017-06-07 | Method and device for removing harmful gas by gas discharge in cooperation with solution absorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638503.0A CN106076090A (en) | 2016-08-03 | 2016-08-03 | A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx |
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| CN106076090A true CN106076090A (en) | 2016-11-09 |
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| CN201610638503.0A Pending CN106076090A (en) | 2016-06-08 | 2016-08-03 | A kind of discharge plasma works in coordination with the method and apparatus of absorbing NOx |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017211280A1 (en) * | 2016-06-08 | 2017-12-14 | 黄华丽 | Method and device using gas discharge technique and solution absorption technique to remove hazardous gas |
| CN109432960A (en) * | 2018-11-28 | 2019-03-08 | 江门市佐敦环保科技有限公司 | A kind of purification device of the exhaust gas containing oxynitrides |
| CN114074948A (en) * | 2021-03-31 | 2022-02-22 | 浙江工业大学 | Method and device for preparing ammonia |
-
2016
- 2016-08-03 CN CN201610638503.0A patent/CN106076090A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017211280A1 (en) * | 2016-06-08 | 2017-12-14 | 黄华丽 | Method and device using gas discharge technique and solution absorption technique to remove hazardous gas |
| CN109432960A (en) * | 2018-11-28 | 2019-03-08 | 江门市佐敦环保科技有限公司 | A kind of purification device of the exhaust gas containing oxynitrides |
| CN114074948A (en) * | 2021-03-31 | 2022-02-22 | 浙江工业大学 | Method and device for preparing ammonia |
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