CN1973991A - Synchronous gas-liquid purifying high voltage DC/pulse discharge method and device - Google Patents

Synchronous gas-liquid purifying high voltage DC/pulse discharge method and device Download PDF

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Publication number
CN1973991A
CN1973991A CN 200610154446 CN200610154446A CN1973991A CN 1973991 A CN1973991 A CN 1973991A CN 200610154446 CN200610154446 CN 200610154446 CN 200610154446 A CN200610154446 A CN 200610154446A CN 1973991 A CN1973991 A CN 1973991A
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gas
corona discharge
discharge electrode
hollow
liquid
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CN 200610154446
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Chinese (zh)
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CN100446849C (en
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吴祖成
康颖
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浙江大学
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Abstract

The present invention discloses synchronous gas-liquid purifying high voltage DC/pulse discharge method and device. After waste gas and waste liquid is fed to the gas-liquid plasma generator and the hollow nozzle as the corona electrode and the metal net as the earthing electrode are connected separately to the positive pole and negative pole of the high voltage DC/pulse power source, the power source powers is turned on to make the plasma generator generate electric field of strength 1-10 kV/cm and produce corona discharge, so as to excite the free radical source matter molecule in the plasma generator and to generate active particle degrading pollutant and killing bacteria, viruses, micro algae and protozoa, with the purified liquid or gas being exhausted. The present invention has high treating efficiency, simple technological process, low power consumption, low treating cost and no secondary pollution.

Description

A kind of method of high voltage DC synchronous gas-liquid purifying and device
Technical field
The present invention relates to environmental technology field, especially relate to a kind of method and device of high voltage DC synchronous gas-liquid purifying.
Background technology
The Low Temperature Plasma Treating method is a kind of new advanced oxidation processes.Be widely used in water treatment and atmospheric treatment field in recent years.The Low Temperature Plasma Treating organic exhaust gas is mainly used in handles volatile organic waste gas (VOCs), SOx, NOx and flue dust, bacterium.And attempt this technology is used to handle organic wastewater with difficult degradation thereby is in the later stage eighties.
Chemical reaction in the gaseous state low temperature plasma mainly is to excite by the high energy electron that gas discharge produces to finish.Electronics, ion, free radical and excited state molecule are rich in low temperature plasma inside.Wherein inelastic collision takes place in high energy electron and gas molecule (atom), energy is converted into the interior energy of ground state molecule (atom), excite, a series of processes such as disassociation and ionization, make gas be in the state of activation, produce free radicals such as oxidisability extremely strong OH, H, O.And the nonequilibrium plasma energy consumption is not high, and this provides desirable approach for some need the removal that difficult degradation is polluted in the reaction of very big activation energy such as the atmosphere.
Topmost effect is ultra-violet radiation and free radical effect in the liquid reaction of low temperature plasma process.These two kinds of effects make hydrone dissociate, and generate hydroxyl radical free radical and other high mars free radicals, as excited oxygen, O 3Deng.Have the very free radical and the organic structure of organic matter decohesion of strong oxidizing property, organic matter degradation is CO the most at last 2, H 2O or other organic innocuous substances.This class reaction is a strong non-equilibrium chemical transmitter reaction, all can take place in liquid and gas.
Therefore, the obvious advantage that plasma technique is compared other difficult degradation organic liquid waste exhaust gas treatment technologies is: applied range, and the organic removal rate height, non-secondary pollution, using can source clean.
But be applied to the organic method of low-temperature plasma degradation at present and be essentially independent water treatment or independent gas treatment, seldom have to be applied to technology and the device that the gas-liquid two-phase pollutant is degraded simultaneously and removed; In addition, the plasma discharge mode that has water to participate in adopts the pulse power more, power supply cost height, and energy consumption is higher relatively, the difficult coupling rationally of the project organization of plasma generator and power supply.
Summary of the invention
The object of the present invention is to provide a kind of method and device of high voltage DC synchronous gas-liquid purifying.
The technical solution adopted for the present invention to solve the technical problems is:
One, a kind of method of high voltage DC synchronous gas-liquid purifying
Waste gas and waste liquid are respectively from air inlet, inlet enters in the gas-liquid plasma generator, the hollow nozzle corona discharge electrode, the wire netting earthing pole connects the positive pole of HVDC/pulse power respectively, earthing pole, power to high voltage source, making the interior average field intensity of plasma generator is 1~10kV/cm, free radical source matter molecule in the corona discharge activate plasma generator, producing active particle and contaminant molecule reacts, make pollutant wherein obtain degraded and efficient kill bacteria, virus, little algae, protozoan, purified gas and liquid are discharged from gas outlet and liquid outlet respectively.
Feed the productive rate that radical source gas is used to increase active particle in the described hollow nozzle corona discharge electrode.
Described radical source gas is air, oxygen or steam.
Two, a kind of HVDC/pulse gas-liquid synchronous discharge purifies the device of aqueous vapor, and following several device is arranged:
Device 1:
Comprise HVDC/pulse power, have the cylindric insulation crust of gas outlet, air inlet, inlet, liquid outlet from top to bottom successively, the plasma generator that cylinder type metal net earthing pole and hollow nozzle corona discharge electrode are formed.Cylindric insulation crust inwall is equipped with cylinder type metal net earthing pole, the hollow nozzle corona discharge electrode is contained in cylinder type metal net earthing pole center, and be fixed on the plasma generator and cover, hollow nozzle corona discharge electrode bottom and cylinder type metal net earthing pole are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, and the hollow nozzle corona discharge electrode connects the positive pole of HVDC/pulse power.
Device 2:
Comprise HVDC/pulse power, have the cylindric insulation crust of gas outlet, inlet, liquid outlet from top to bottom successively, the plasma generator that cylinder type metal net earthing pole and hollow nozzle corona discharge electrode are formed.Cylindric insulation crust inwall is equipped with cylinder type metal net earthing pole, the hollow nozzle corona discharge electrode is contained in cylinder type metal net earthing pole center, and be fixed on the plasma generator and cover, corona discharge electrode bottom and netted earthing pole are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, the hollow nozzle corona discharge electrode connects the positive pole of high-voltage DC power supply, and its central through hole is an air inlet, and air inlet inserts simultaneously and adds radical source gas and pending waste gas.
The hollow nozzle corona extremely axially is evenly equipped with the hollow metal nozzle described in device 1 and the device 2, the hollow nozzle corona discharge electrode is connected with the hollow metal nozzle, it is uniform that hollow nozzle corona discharge electrode hollow metal nozzle radially is the circumference equal angles, and the axial hollow metal nozzle of hollow nozzle corona discharge electrode in the shape of a spiral or many helical arrangement.
Device 3:
Comprise high-voltage DC power supply, have the cylindric insulation crust of gas outlet, air inlet, inlet, liquid outlet from top to bottom successively, the plasma generator that one group of hollow needle-like corona discharge electrode and circular metal net earthing pole are formed.Circular metal net earthing pole is positioned over plasma generator inside, the metal conductive bar upper end passes from cylindric insulation crust loam cake center, lower end and the welding of circular metal net earthing pole center are fixing, regulate metal conductive bar height up and down, make circular metal net earthing pole position be higher than air inlet, and connect the power ground utmost point, and one group of hollow needle-like corona discharge electrode is packed into from the plasma generator bottom, and one group of hollow needle-like corona discharge electrode connects the positive source of high-voltage DC power supply.
One group of hollow needle-like corona discharge electrode described in the device 3 is distributed in the plasma generator bottom, the top at grade and be parallel to gas-liquid interface and circular metal net earthing pole, the bottom interconnects in gathering pipe, gathers the pipe other end and connects by the adjustable flow meter and add radical source gas.
The beneficial effect that the present invention has is, can realize under the effect of direct current/pulsed high voltage generator that the gas-liquid synchronous discharge handles organic and inorganic pollutant and the microorganism such as kill bacteria, little algae efficiently in water, the gas two-phase simultaneously, can carry out at normal temperatures and pressures, treatment effeciency height, technological process are simple, energy consumption and low, the no poisonous and harmful intermediate product of operating cost, non-secondary pollution.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of corona discharge electrode among the embodiment 1;
Fig. 3 is the structural representation of embodiment 2;
Fig. 4 is structure chart and the A-A cutaway view of embodiment 3.
Among the figure: 1. high voltage source, 2. air inlet, 3. inlet, 4. plasma generator, 5. gas outlet, 6. liquid outlet, 7. add radical source gas, 8. cylindric insulation crust, 9. cylinder type metal net earthing pole, 10. hollow nozzle corona discharge electrode, the 11. power ground utmost points, 12. adjustable flow meters, 13. the hollow metal nozzle, 14. pending waste gas, 15. hollow needle-like corona discharge electrodes, 16. circular metal net earthing pole, 17. metal conductive bar, 18. gather pipe.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Figure 1, a kind of device of high voltage DC synchronous gas-liquid purifying: comprise HVDC/pulse power 1, have the cylindric insulation crust 8 of gas outlet 5, air inlet 2, inlet 3, liquid outlet 6 from top to bottom successively, the plasma generator 4 that cylinder type metal net earthing pole 9 and hollow nozzle corona discharge electrode 10 are formed; Cylindric insulation crust 8 inwalls are equipped with cylinder type metal net earthing pole 9, hollow nozzle corona discharge electrode 10 is contained in cylinder type metal net earthing pole 9 centers, and be fixed on the plasma generator 4 and cover, hollow nozzle corona discharge electrode 10 bottoms and cylinder type metal net earthing pole 9 are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, and hollow nozzle corona discharge electrode 10 connects the positive pole of HVDC/pulse power 1.As shown in Figure 2, it axially is evenly equipped with hollow metal nozzle 13 described hollow nozzle corona discharge electrode 10, hollow nozzle corona discharge electrode 10 is connected with hollow metal nozzle 13, it is uniform that hollow nozzle corona discharge electrode 10 hollow metal nozzle 13 radially is the circumference equal angles, and the axial hollow metal nozzle 13 of hollow nozzle corona discharge electrode 10 in the shape of a spiral or many helical arrangement.
Give HVDC constant current/pulse power 1 power supply, making plasma generator two interpolar average field intensities is 1~10kV/cm, waste gas and waste liquid enter gas-liquid plasma generator 4 from air inlet 2 inlets 3 respectively, active particle (free radical, O that pollutant wherein produces with corona discharge in generator 3Deng) react, obtain degraded, purified gas and liquid respectively from the gas outlet 5 and liquid outlet 6 discharge, in this process, gas flowmeter 12 by adjustable flow feeds a certain amount of radical source gas 7 (as air, oxygen or steam etc.) by hollow nozzle corona discharge electrode 10 in plasma generator, be used to increase the productive rate of active particle, and then improve the treatment effeciency of pollutant.
Embodiment 2:
As shown in Figure 3, a kind of device of high voltage DC synchronous gas-liquid purifying: comprise HVDC/pulse power 1, have the cylindric insulation crust 8 of gas outlet 5, inlet 3, liquid outlet 6 from top to bottom successively, the plasma generator 4 that cylinder type metal net earthing pole 9 and hollow nozzle corona discharge electrode 10 are formed.Cylindric insulation crust 8 inwalls are equipped with cylinder type metal net earthing pole 9, hollow nozzle corona discharge electrode 10 is contained in cylinder type metal net earthing pole 9 centers, and be fixed on the plasma generator 4 and cover, corona discharge electrode 10 bottoms and netted earthing pole 9 are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, hollow nozzle corona discharge electrode 10 connects the positive pole of high-voltage DC power supply 1, and its central through hole is an air inlet, and air inlet inserts simultaneously and adds radical source gas 7 and pending waste gas 14.As shown in Figure 2, it axially is evenly equipped with the hollow metal nozzle 13 of hollow described hollow nozzle corona discharge electrode 10, hollow nozzle corona discharge electrode 10 is connected with the hollow metal nozzle 13 of hollow, it is uniform that hollow nozzle corona discharge electrode 10 hollow metal nozzle 13 radially is the circumference equal angles, and the axial hollow metal nozzle 13 of hollow nozzle corona discharge electrode 10 in the shape of a spiral or many helical arrangement.
Give HVDC constant current/pulse power 1 power supply, making plasma generator two interpolar average field intensities is 1~10kV/cm, pending waste gas 14 and add radical source gas 7 separately by adjustable gas flowmeter control tolerance, enter gas-liquid plasma generator 4 from hollow nozzle corona discharge electrode 10 tops, waste liquid enters gas-liquid plasma generator 4 from inlet 3, active particle (free radical, O that pollutant wherein produces with corona discharge in generator 3Deng) react, obtain degraded, purified gas and liquid respectively from the gas outlet 5 and liquid outlet 6 discharge.
Embodiment 3:
As shown in Figure 4, a kind of device of high voltage DC synchronous gas-liquid purifying: comprise high-voltage DC power supply 1, have 8, one groups of hollow needle-like of cylindric insulation crust corona discharge electrode 15 of gas outlet 5, air inlet 2, inlet 3, liquid outlet 6 and the plasma generator 4 that circular metal net earthing pole 16 is formed from top to bottom successively.Circular metal net earthing pole 16 is positioned over plasma generator 4 inside, metal conductive bar 17 upper ends pass from cylindric insulation crust 8 loam cake centers, lower end and the welding of circular metal net earthing pole 16 centers are fixing, regulate metal conductive bar 17 height up and down, make circular metal net earthing pole 16 positions be higher than air inlet 2, and connect 11, one groups of hollow needle-like of power ground utmost point corona discharge electrode 15 and pack into from plasma generator 4 bottoms, one group of hollow needle-like corona discharge electrode 15 connects the positive source of high-voltage DC power supply 1.Described one group of hollow needle-like corona discharge electrode 15 is distributed in plasma generator 4 bottoms, the top at grade and be parallel to gas-liquid interface and circular metal net earthing pole 16, the bottom interconnects in gathering pipe 18, gathers pipe (18) other end and connects by adjustable flow meter 12 and add radical source gas 7.
Give HVDC constant current/pulse power 1 power supply, making plasma generator two interpolar average field intensities is 1~10kV/cm, waste gas and waste liquid enter gas-liquid plasma generator 4 from air inlet 2 inlets 3 respectively, active particle (free radical, O that pollutant wherein produces with corona discharge in generator 3Deng) react, obtain degraded, purified gas and liquid respectively from the gas outlet 5 and liquid outlet 6 discharge, in this process, gas flowmeter 12 by adjustable flow feeds radical source gas 7 (as air, oxygen or steam etc.) by gathering pipe 18 to one group of hollow needle-like corona discharge electrode 15, provide enough radical sources for the collaborative exoelectrical reaction of corona gas-liquid two-phase on the one hand, bubble enters the gas phase discharge from liquid phase on the other hand, liquids and gases in the generator are played stirring action respectively, make that wherein pollutant levels are even, improve degradation efficiency.
Above embodiment is a gaseous contaminant with benzene, toluene, ethylbenzene, dimethylbenzene, hydrogen sulfide, and parachlorophenol, phenol are that liguid phase pollutant experimentizes, and the microbial survival amount in gas, the liquid two-phase is detected, and experiment condition and experimental result are as follows:
At average field intensity is under the 5kV/cm, and the initial concentration of benzene, toluene, ethylbenzene, dimethylbenzene, hydrogen sulfide is 100ppm in the gas phase, and initial total clump count is 10 6CFU/m 3, processing time 60s, more than the clearance of five kinds of pollutants be respectively: 84%, 90%, 93%, 99%, 99%, total removal of bacteria rate is 99.8%.Under the same treatment condition, parachlorophenol, initial phenol concentration are 200mg/L in the liquid phase, and initial total clump count is 10 3CFU/ml, processing time 60s, the clearance of above pollutant is respectively: 75% and 80% total removal of bacteria rate is 99%, processing time 120s, the clearance of above pollutant is respectively: 85% and 90% total removal of bacteria rate is 99.9%.
The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (9)

1. the method for a high voltage DC synchronous gas-liquid purifying, it is characterized in that: waste gas and waste liquid are respectively from air inlet, inlet enters in the gas-liquid plasma generator, the hollow nozzle corona discharge electrode, the wire netting earthing pole connects the positive pole of HVDC/pulse power respectively, earthing pole, power to high voltage source, making the interior average field intensity of plasma generator is 1~10kV/cm, free radical source matter molecule in the corona discharge activate plasma generator, producing active particle and contaminant molecule reacts, make pollutant wherein obtain degraded and efficient kill bacteria, virus, little algae, protozoan, purified gas and liquid are discharged from gas outlet and liquid outlet respectively.
2. the method for a kind of high voltage DC synchronous gas-liquid purifying according to claim 1 is characterized in that: feed the productive rate that radical source gas is used to increase active particle in the described hollow nozzle corona discharge electrode.
3. the method for a kind of high voltage DC synchronous gas-liquid purifying according to claim 2 is characterized in that: described radical source gas is air, oxygen or steam.
4. the device of a high voltage DC synchronous gas-liquid purifying, it is characterized in that: comprise HVDC/pulse power (1), have the cylindric insulation crust (8) of gas outlet (5), air inlet (2), inlet (3), liquid outlet (6) from top to bottom successively, the plasma generator (4) that cylinder type metal net earthing pole (9) and hollow nozzle corona discharge electrode (10) are formed; Cylindric insulation crust (8) inwall is equipped with cylinder type metal net earthing pole (9), hollow nozzle corona discharge electrode (10) is contained in cylinder type metal net earthing pole (9) center, and be fixed on the plasma generator (4) and cover, hollow nozzle corona discharge electrode (10) bottom and cylinder type metal net earthing pole (9) are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, and hollow nozzle corona discharge electrode (10) connects the positive pole of HVDC/pulse power (1).
5. the device of a kind of high voltage DC synchronous gas-liquid purifying according to claim 4, it is characterized in that: it axially is evenly equipped with hollow metal nozzle (13) described hollow nozzle corona discharge electrode (10), hollow nozzle corona discharge electrode (10) is connected with hollow metal nozzle (13), it is uniform that hollow nozzle corona discharge electrode (10) hollow metal nozzle (13) radially is the circumference equal angles, and the axial hollow metal nozzle (13) of hollow nozzle corona discharge electrode (10) in the shape of a spiral or many helical arrangement.
6. the device of a high voltage DC synchronous gas-liquid purifying, it is characterized in that: comprise HVDC/pulse power (1), have the cylindric insulation crust (8) of gas outlet (5), inlet (3), liquid outlet (6) from top to bottom successively, the plasma generator (4) that cylinder type metal net earthing pole (9) and hollow nozzle corona discharge electrode (10) are formed; Cylindric insulation crust (8) inwall is equipped with cylinder type metal net earthing pole (9), hollow nozzle corona discharge electrode (10) is contained in cylinder type metal net earthing pole (9) center, and be fixed on the plasma generator (4) and cover, corona discharge electrode (10) bottom and netted earthing pole (9) are positioned on the same horizontal plane, this horizontal plane is parallel with gas-liquid interface, hollow nozzle corona discharge electrode (10) connects the positive pole of high-voltage DC power supply (1), its central through hole is an air inlet, and air inlet inserts simultaneously and adds radical source gas (7) and pending waste gas (14).
7. the device of a kind of high voltage DC synchronous gas-liquid purifying according to claim 6, it is characterized in that: it axially is evenly equipped with hollow metal nozzle (13) described hollow nozzle corona discharge electrode (10), hollow nozzle corona discharge electrode (10) is connected with hollow metal nozzle (13), it is uniform that hollow nozzle corona discharge electrode (10) hollow metal nozzle (13) radially is the circumference equal angles, and the axial hollow metal nozzle (13) of hollow nozzle corona discharge electrode (10) in the shape of a spiral or many helical arrangement.
8. the device of a high voltage DC synchronous gas-liquid purifying, it is characterized in that: comprise high-voltage DC power supply (1), have the cylindric insulation crust (8) of gas outlet (5), air inlet (2), inlet (3), liquid outlet (6) from top to bottom successively, the plasma generator (4) that one group of hollow needle-like corona discharge electrode (15) and circular metal net earthing pole (16) are formed; Circular metal net earthing pole (16) is positioned over plasma generator (4) inside, metal conductive bar (17) upper end passes from cylindric insulation crust (8) loam cake center, lower end and the welding of circular metal net earthing pole (16) center are fixing, regulate metal conductive bar (17) height up and down, make circular metal net earthing pole (16) position be higher than air inlet (2), and connect the power ground utmost point (11), one group of hollow needle-like corona discharge electrode (15) is packed into from plasma generator (4) bottom, and one group of hollow needle-like corona discharge electrode (15) connects the positive source of high-voltage DC power supply (1).
9. the device of a kind of high voltage DC synchronous gas-liquid purifying according to claim 8, it is characterized in that: described one group of hollow needle-like corona discharge electrode (15) is distributed in plasma generator (4) bottom, the top at grade and be parallel to gas-liquid interface and circular metal net earthing pole (16), the bottom interconnects in gathering pipe (18), gathers pipe (18) other end and connects by adjustable flow meter (12) and add radical source gas (7).
CNB2006101544465A 2006-11-01 2006-11-01 Synchronous gas-liquid purifying high voltage DC/pulse discharge method and device CN100446849C (en)

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CN101455938A (en) * 2008-12-12 2009-06-17 上海惠罗环境工程有限公司 Plasma biology deodorization technique and system of vent gas from steel-drum spray-painting production line
CN101219771B (en) * 2008-01-18 2010-06-02 中国科学院广州能源研究所 Plasma diffraction electrode
CN101496987B (en) * 2009-01-20 2011-04-27 浙江工商大学 Wet-type flue gas treating reactor by pulse corona
CN102040265A (en) * 2010-11-09 2011-05-04 浙江大学 Method for sterilizing liquid by using along-surface resonant pulse discharge plasma
CN103732530A (en) * 2011-06-24 2014-04-16 Jtw有限责任公司 Advanced nano technology for growing metallic nano-clusters
CN105253948A (en) * 2015-08-05 2016-01-20 中国科学院等离子体物理研究所 Free radical separation-type water treatment method
CN106938173A (en) * 2017-03-14 2017-07-11 中原工学院 A kind of micro-nano bubble dyeing waste-water of plasma, VOCs coprocessing systems

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* Cited by examiner, † Cited by third party
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CN101219771B (en) * 2008-01-18 2010-06-02 中国科学院广州能源研究所 Plasma diffraction electrode
CN101455938A (en) * 2008-12-12 2009-06-17 上海惠罗环境工程有限公司 Plasma biology deodorization technique and system of vent gas from steel-drum spray-painting production line
CN101496987B (en) * 2009-01-20 2011-04-27 浙江工商大学 Wet-type flue gas treating reactor by pulse corona
CN102040265A (en) * 2010-11-09 2011-05-04 浙江大学 Method for sterilizing liquid by using along-surface resonant pulse discharge plasma
CN103732530A (en) * 2011-06-24 2014-04-16 Jtw有限责任公司 Advanced nano technology for growing metallic nano-clusters
CN105253948A (en) * 2015-08-05 2016-01-20 中国科学院等离子体物理研究所 Free radical separation-type water treatment method
CN106938173A (en) * 2017-03-14 2017-07-11 中原工学院 A kind of micro-nano bubble dyeing waste-water of plasma, VOCs coprocessing systems

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