The oxygen activity particle forms the hydroxyl free based method in gas
Technical field
The invention belongs to gas ionization discharge, plasma chemistry and environmental project applied technical field, relate to oxygen activity particle formation hydroxyl free based method in the gas.
Background technology
There are contaminants of chemical origin and biological pollutant in the gas.Chemical pollutant is meant aromatic compound (toluene, dimethylbenzene, paracide etc.), organohalogen compounds (tetrachloroethylene, chloromethanes etc.); Alcohols (methanol, ethanol, chloro ethanol etc.); Ketone (acetone, methyl ethyl ketone etc.); Aldehydes (formaldehyde, acetaldehyde etc.); Esters (ethyl acetate); Ethers (methyl ether, ether, propyl ether, basic ether, propyl ether); Organohalogen compounds (Niran, paracide, heptachlor etc.).Biological pollutant is meant antibacterial, mycete, streptococcus, Sour lung legionella and dirt demodicid mite etc., and inorganic pollution such as gaseous sulfur dioxide, nitrogen oxide.Usually adopt purification methods such as absorption, photocatalysis, anion, ozone.Effective, feasible method is the ozone purification method in these methods.Because the ozone oxidation reduction potential is 2.07V, is selective decomposition, oxidize contaminants, can only handle part pollutant in the gas phase; It and pollutant reaction speed constant only are 10
-1L mols~10
2L mols, ozone is killed the aspergillosis time and is reached about 100min in gas phase, as seen, the most effective in the existing gas purification technique is the ozone gas purification techniques, but this technology remains in following weak point, oxidation-reduction potential only is 2.07V; Reaction rate constant is too low, only is 10
-1L mols~10
2L mols, than low 7 orders of magnitude of hydroxyl radical free radical OH, ozone is oxidation Decomposition pollutant and the selection killing microorganisms is arranged selectively thus; Reaction rate constant is low, and the response time, visible ozone gas purification method was difficult to satisfy current gas purification needs up to 20min~100min.
Present method for gas purification existing problems:
1) pollutant in the gas is selectively purified.Promptly being that a kind of method for gas purification is administered one or more pollutant, usually is to adopt several air purification method synergism to realize the gas purification purpose;
2) reaction rate constant of existing gas purification technique is very low, and the gas purification response time reaches 20min~100min, is difficult to realize that online fast gas purifies;
3) existing gas cleaning equipment is bulky, one-time investment and operating cost height;
4) need extra catalyst, absorbent, reductant-oxidant etc., so that increase reaction rate and improve selectivity.
Summary of the invention
The objective of the invention is to solve formation hydroxyl free based method weak point in the gaseous state, oxygen activity particle formation hydroxyl free based method in the gas is provided.This invention is the oxygen activity particle (O the high concentration low discharge
2 +, O
3, O (
1D), O (
3P) etc.) in flow in pipes or the container, O in the oxygen activity particle
2 +Generate high initial reaction rate constant 2.2 * 10 with water reaction in the gas
6The hydroperoxyl IONS OF H O of L/mols
2 -Initiator, oxygen activity particle and HO
2 -Carry out plasma reaction and generate active particle group, organic pollution and deadly, deactivation tiny organism, antibacterial and virus in the oxidation Decomposition gas based on OH.Because its reaction rate constant is up to 10
7L mols~10
10L mols, can be in 1ms~10s organic pollution in the oxidation Decomposition gas; Cause death, the small harmful organism of deactivation and virus, realized that quick nothing selects to eliminate gas pollutant; Hydroxyl radical free radical OH oxidizing potential is up to 2.80V, and is almost suitable with fluorine (2.87V), and non-selectivity is eliminated chemistry and biological pollution in the gas, finally resolves into CO
2, H
2O and micro-inorganic salt.Meet Green Chemistry 12 principles, and reach the high-level oxidation technology requirement, the present invention has realized not producing the side-product of any recontaminate without oxidant, catalyst and Reducing agent, environment is not produced gas green, the fast purification new method of any negative effect.
The present invention solves technical scheme that its technology adopts:
The present invention is the O that oxygen activity particle generator 2 is produced
2 +, O
3, O (
1D), O (
3P) etc. oxygen activity particle 6 injects air flue 8 or reactor 10, wherein O
2 +Deng with gas in hydrone generation plasma chemical reaction generate hydroperoxyl ionic initiator HO
2 -, the oxygen activity particle is at initiator HO
2 -Effect forms hydroxyl radical free radical OH down, and its scheme as shown in Figure 1, 2, 3.
The present invention adopts highfield ionic discharge method, and low discharge oxygen is produced high concentration (1 * 10
7/ cm
3~4 * 10
18/ cm
3) O
2 +, O
3, O (
1D), O (
3P) etc. oxygen activity particle 6 injects air flues 8 (or reactor 10), O in the oxygen activity particle
2 +Deng with gas 7 in hydrone generation plasma chemical reaction, generate high concentration (10
7/ cm
3~10
16/ cm
3), high initial reaction rate constant (2.2 * 10
6L/mols) HO
2 -The hydroperoxyl ionic initiator, O
2 +, O
3, O (
1D), O (
3P) oxygen activity particle 6 and initiator HO such as
2 -It is 10 that reaction generates concentration
8/ cm
3~10
17/ cm
3OH, it 0.01s~10s in the time air flue 8 or reactor 10 in pollutant oxidation eliminate, realization is without catalyst, absorbent, Reducing agent and other traditional method synergism, pollutant in the gas 7 are eliminated in the OH oxidation, elimination factor reaches 85%~99.8%, from Fig. 1,2 as seen, forming the OH method and apparatus in air flue or reactor is key technology of the present invention and device.The plasma reaction that active particle of the present invention injects air flue or reactor generates the OH pattern as shown in Figure 3.
This scheme will provide a kind of effective, feasible new equipment, new technique for solving the problem that forms the hydroxyl radical free radical existence at present in gas.Implementing concrete steps of the present invention is:
1. the oxygen activity particle is produced.
Key technology of the present invention is newly to develop to produce high concentration O
2 +, O
3, O (
1D), O (
3The oxygen activity particle generator 2 of oxygen activity particle 6 such as P).It is made up of parts such as discharge plate, earthing pole, dielectric layer and partitions.Discharge electrode, earthing pole are to be processed into titanium or rustless steel, and regulate and control the temperature of plasma process reactor with cooling liquid.
The present invention adopts dielectric impedance highfield ionic discharge method O
2Make concentration and reach 1 * 10
7/ cm
3~4 * 10
18/ cm
3The oxygen activity particle, set up reduced electric field intensity in 0.5mm between discharge electrode and earthing pole~0.01mm discharging gap in 200Td~400Td scope internal ionization discharge field, electronics obtains average energy and reaches 6eV~9eV from electric field, the useful energy (8.4eV~12.5eV) will be deposited on O that wherein most of electron institute has
2On, be enough to O
2Dissociate, be ionized into the high concentration active particle, and the difference orientation generates oxygen activity particle O under the electric pulse field parameter regulation and control
2 +, O
3, O (
1D), O (
3P) etc.Produce oxygen activity particle plasma reaction pattern as shown in Figure 3, O is provided in flue
2 +, O
3, O (
1D), O (
3P) etc. oxygen activity particle 6 concentration reach 1 * 10
7/ cm
3~4 * 10
18/ cm
3
2. initiator HO in air flue 8 or the reactor 10
2 -Formation.O in the oxygen activity particle
2 +Deng with gas 7 in water molecule reaction generate HO
2 -Initiator, its plasma reaction pattern as shown in Figure 3.
H
2O
2With HO
2 -Be in a kind of balancing response state, in air flue or reactor, form initiator HO
2 -Concentration reach 10
7/ cm
3~10
16/ cm
3
3. air flue or reactor OH oxidation destroy contaminants.Form in air flue 8 or the reactor 10 based on the active particle radical oxidation of OH and eliminate pollutant M in the gas, pollutant finally resolve into CO
2, H
2O and micro-inorganic salt.
Effect of the present invention and benefit are that the oxygen activity particle is injected air flue or reactor and gas water molecule reaction generation OH, and this reaction is that high-level oxidation technology is expanded to new gas field from water treatment field.Because its chemical reaction rate is fast, exceed 7 more than the order of magnitude than present method for gas purification, so the chemical time of destroy contaminants only is 0.01s~10s, thereby flow process shortens, equipment reduces, and this will reduce equipment investment and operating cost significantly, cut down the consumption of energy; Realized purifying without the quick green gases of extra catalyst, absorbent and Reducing agent; Reduce operating cost, new environmental pollution has not taken place again, solved the difficult problem of present gas purification technique, thereby accomplished zero environmental, zero waste discharge, reached the high-level oxidation technology principles and requirements; Help solving problems such as the high purification efficiency of China's gas purification energy consumption is low and bulky.
Description of drawings
Fig. 1 is that the oxygen activity particle injects air flue formation hydroxyl radical free radical scheme sketch map.
Fig. 2 forms hydroxyl radical free radical scheme sketch map in the oxygen activity particle injecting reactor.
Fig. 3 is the plasma chemical reaction ideograph that generates OH in air flue or the reactor.
Fig. 4 is the curve chart that oxygen activity particle and pollutant mol ratio n influence the pollution abatement rate.
Fig. 5 is the curve chart that water volume concentration influences destroy contaminants in the air flue.
Fig. 6 is the curve chart of flue-gas temperature to the destroy contaminants influence.
Among the figure: 1. oxygen; 2. oxygen activity particle generator; 3. high tension cable; 4. high-frequency and high-voltage power supply; 5.~220V; 6.O
2 +, O
3, O (
1D), O (
3Oxygen activity particle such as P); 7. gas; 8. air flue; 9. Purge gas; 10. reactor.
The specific embodiment
Be described in detail specific embodiments of the invention below in conjunction with technical scheme and accompanying drawing.
The overall embodiment of the present invention as shown in Figure 1, 2.Forming O after oxygen 1 disassociation, the ionization
2 +, O
3, O (
1D), O (
3The oxygen activity particle generator 2 of oxygen activity particle 6 such as P).The generation hydroxyl radical free radical plasma chemical reaction pattern of oxygen activity particle generation of the present invention and injection air flue 8 or reactor 10 as shown in Figure 3.
Low discharge oxygen 1 is injected oxygen activity particle generator 2, high-frequency high-voltage is to be applied on the discharge plate by high-frequency and high-voltage power supply 4, form the dense ionization electric field that reduced electric field intensity reaches 200Td~400Td in discharging gap, oxygen 1 forms concentration and reaches 1 * 10 after disassociation, ionization
7/ cm
3~4 * 10
18/ cm
3O
2 +, O
3, O (
1D), O (
3P) oxygen activity particle 6, wherein O such as
2 +Generate HO with water reaction in the gas
2 -Initiator concentration reaches 10
7/ cm
3~10
16/ cm
3O
2 +, O
3, O (
1D), O (
3P) oxygen activity particle 6 and HO such as
2 -Initiator carries out plasma chemical reaction and generates OH, and its concentration reaches 10
7/ cm
3~10
18/ cm
3
The invention process result is shown in Fig. 4~6.From the oxygen activity particle of Fig. 4 and pollutant mol ratio n to the curve of pollutant elimination factor influence as can be known, when oxygen activity particle and pollutant mol ratio were 4, the pollutant elimination factor reached 97.1%; When n=2, elimination factor reaches 91.5%.From Fig. 5 as seen, water volume concentration is lower than at 4% o'clock in the gas, and is bigger to the influence of pollutant elimination factor, when water volume concentration greater than 8% the time, then water volume concentration is to the almost not influence of pollutant elimination factor.From Fig. 6 as seen, when being lower than 60 ℃, gas temperature then the pollutant elimination factor is not almost had influence, linear decline during greater than 70 ℃.