CN104923060B - VOCs removing method based on free radical advanced oxidation - Google Patents
VOCs removing method based on free radical advanced oxidation Download PDFInfo
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Abstract
The invention relates to a VOCs removing method based on free radical advanced oxidation. According to the method, peroxide is decomposed under ultraviolet light radiation, such that hydroxyl or sulfate free radicals are produced and adopted as a VOCs oxidant; and the harmful gas VOCs in waste gas is removed through oxidation in an impinging bed. Part of the waste gas from a discharge source is mixed with part of a peroxide solution, and the mixture is sprayed into the impinging bed with a high-speed nozzle; the other part of the waste gas is mixed with the other part of the peroxide solution, and the mixture is sprayed into the impinging bed with a coaxially and oppositely arranged high-speed nozzle; the two streams of atomized gas-liquid mixtures are subjected to opposite-direction impingement mixing in the impinging bed; VOCs is oxidized and removed with hydroxyl or sulfate free radicals produced with peroxide decomposed under the radiation of ultraviolet light; residual carbon solution produced in the reaction enters a rear separation column and is subjected to filtration separation; residual carbon obtained after separation is dried in a drying column, and can be used as a fuel. The system has high VOCs removal efficiency, and does not cause secondary pollution during the removal process. The system has a good market application prospect.
Description
Technical field
The present invention relates to atmosphere pollution control field, and in particular to a kind of VOCs based on free radical advanced oxidation is removed
Method.
Background technology
VOCs is the english abbreviation of VOC (Volatile Organic Compounds).Numerous studies
Show, VOCs after respiratory tract and skin enter human body, the organ such as the breathing that can give people, blood, liver cause it is temporary and
Permanent pathological changes (can for example cause various hematopathys and cancer).Various organic compounds can be produced in commercial production, it is main to wrap
Various hydro carbons, alcohols, aldehydes, acids, ketone and amine etc. are included, these organic exhaust gas can cause atmospheric pollution, harmful to human to be good for
Health.With economic fast development and the raising of people's environmental consciousness, in tail gas, VOCs removings problem is increasingly by people's
Concern.Meanwhile, country has also formulated corresponding laws and regulations and has made strict restriction to the discharge capacity of VOCs.Research and development VOCs's
Efficient removal technology has become the hot issue of countries in the world concern.
In the past few decades, domestic and international research worker has been made substantial amounts of research to VOCs removings problem in waste gas and has been opened
Various VOCs removal methods are sent out.According to the ultimate principle of removing, waste gas VOCs removal methods mainly include condensing back Shou Fa ﹑ suctions
The direct Ran Shao Fa ﹑ Production by Catalytic Combustion Process of Shou Fa ﹑ and absorption method etc..Condensation absorption method is applied to that organic exhaust gas concentration is high, temperature is low, wind
The little operating mode of amount, needs attached freezing equipment, is mainly used in pharmacy, chemical industry, and the less employing of printing enterprise, using model
Enclose and limited to.What absorption process was conventional is Physical Absorption, that is, introduce exhaust gas into absorbing liquid purification, and after liquid saturation to be absorbed, Jing adds
Heat, parsing, condensation are reclaimed.This method be applied to atm number, low temperature, the waste gas of low concentration, but need to be equipped with heating parse back
Receiving apparatus, equipment volume is big, invest higher.Directly combustion method is using aid fuel combustions such as combustion gas or fuel oils, by gaseous mixture
Body is heated, and makes harmful substance be decomposed into innocuous substance under high temperature action.The method process is simple, investment are little, it is adaptable to highly concentrated
Degree, the waste gas of little air quantity, but safe practice, operation are required higher.Production by Catalytic Combustion Process is that waste gas heating Jing catalysis burnings are turned
The carbon dioxide and water of harmless odorless are melted into, this method initiation temperature is low, energy-conservation, purifying rate are high, easy to operate, floor space
Less, suitable for high temperature or the organic exhaust gas of high concentration, but the easy poisoning and deactivation of catalyst, stability is poor.Active carbon adsorption takes off
Except efficiency is up to 95%, equipment is simple, invest little, but activated carbon changes frequent, increased the work journey such as handling, transport, replacing
Sequence, causes operating cost to increase.Therefore, up to the present, it is developed and utilizes despite various VOCs removing sulfuldioxides, but it is each
The technology of kind nearly all has the restriction of range of application and has shortcomings.Therefore, the more economical effectively VOCs removings of continual exploitation
Technology has important practical significance.
The content of the invention
A kind of VOCs removal methods based on free radical advanced oxidation of the present invention are using ultraviolet radiation peroxynitrite decomposition
Compound produces the oxidant of hydroxyl or potentiometric titrations as VOCs of strong oxidizing property, in bed is clashed in oxidation removal waste gas
Harmful gass VOCs.
The principle and course of reaction of the removal methods of the present invention is as follows：
1st, as shown in Figure 1, can be measured in ultraviolet radiation hydrogen peroxide system using electron spin resonance kaleidophon and be produced
Hydroxyl radical free radical is given birth to.Therefore, ultraviolet radiation peroxynitrite decomposition compound is to release the hydroxyl free with strong oxidizing property first
Base, detailed process can use following chemical reaction (1) to represent：
H2O2+UV→2·OH (1)
2nd, as shown in Figure 2, can be measured in ultraviolet radiation Ammonium persulfate. system using electron spin resonance kaleidophon and be produced
Sulfate radical and hydroxyl radical free radical are given birth to.Therefore, ultraviolet radiation decomposes persulfate and is released with strong oxidizing property first
Sulfate radical and hydroxyl radical free radical, detailed process can use following chemical reaction (2) and (3) to represent：
3rd, the sulfate radical and hydroxyl radical free radical of the strong oxidizing property for producing can be by the VOCs oxidation removals in waste gas：
a·OH+bVOCs→cCO2+dH2O+Carbon residues (4)
The carbon residue solution that reaction is produced is separated by filtration into afterbody knockout tower, and the carbon residue after separation enters drying tower and is dried product
Life can be used as the carbon residue of fuel.
To realize object above, the technical solution used in the present invention is as follows：
A kind of VOCs removal methods based on free radical advanced oxidation, described method are the waste gas processes from emission source
Waste gas thermostat respectively enters two flues, and waste gas is separated into two parts, and two parts waste gas is mixed with peroxide solutions
Bed is clashed into from coaxially spraying into the high speed nozzle to arrangement afterwards, the gas-liquid mixtures of two bursts of atomizations occur in bed to hitting clashing into
Hit mixing.The detection and analysis of inventor finds, when the shock equilibrium point of the gas-liquid mixture of described two bursts atomizations is located at shock bed
Vertical center line on when, in reactor, gas-liquid mixture can reach optimal impact strength (now mass transfer rate highest) and most
Good mixed effect, the removal efficiency highest of pollutant.Conversely, when two strands of described gas-liquid mixtures clash into and glance off
(i.e. not on vertical center line when), in reactor, gas-liquid mixture cannot realize uniform mixing, and mass transfer rate is substantially reduced,
Pollutant removing efficiency is decreased obviously, it is impossible to meet environmental protection index.
Ultraviolet radiation peroxynitrite decomposition compound produces hydroxyl or potentiometric titrations oxidation removal VOCs, and inventor is using electricity
Find after sub- spin resonance technology for detection, the too low of ultraviolet light Net long wave radiation intensity setting will be unable to generate sufficient concentrations of freedom
Base oxidation removal pollutant, but the too high energy consumption that will cause system of ultraviolet radiation intensity increases substantially, and reduces system
Economy.Therefore, find through comprehensive analysis and after calculating, the ultraviolet light Net long wave radiation intensity is 20 μ W/cm2-500μW/
cm2.Inventor is had found after being detected using electronic self-rotary resonant technology, if ultraviolet effective wavelength selects too short, ultraviolet light
Propagation distance in reactor is too short, and the Pollutant Treatment amount under unit power is substantially reduced, it is impossible to meet basic process
Require, if but ultraviolet wavelength select it is oversize, the energy of ultraviolet light photons substantially will be reduced, low-energy ultraviolet light photons
The molecular link of peroxide cannot be destroyed, so as to sufficient concentrations of free-radical oxidation removing pollutant cannot be produced.Through synthesis
Detection and analysis after find, ultraviolet effective wavelength be 160nm-290nm.
Peroxide can be caused as the smoke inlet temperature for clashing into bed is too high to occur to shift to an earlier date the oxygen that selfdecomposition wastes costliness
Agent, therefore the waste gas that Combustion Source is produced enters shock bed, the waste gas of the shock bed after waste gas thermostat is lowered the temperature
Not higher than 75 DEG C of inlet temperature.Liquid-gas ratio is too low, and the removal efficiency of pollutant is too low, it is impossible to meet environmental requirement, but liquid-gas ratio
What is arranged is too high, and the power of circulating pump crosses conference causes the energy consumption of system to greatly increase.Experiment and reason of the inventor through system
Find by research, the waste gas is 2L/m with effective liquid-gas ratio of peroxide solutions3-12L/m3。
The too low free-radical oxidation removing pollutant that cannot discharge abundance of peroxide concentrations, but once throw in too high concentration
Peroxidating can cause extra selfdecomposition and side reaction, it is serious that selfdecomposition can cause peroxide oxidant to consume, and increases fortune
Row cost, side reaction produce various harmful components in causing product, affect recycling for final product.Through invention
Find after the experiment of people and detection, the optium concentration of peroxide is between 0.5mol/L-2.5mol/L,
The pH of peroxide solutions is too high to cause peroxide to accelerate selfdecomposition and consume, and increase application cost, but pH
Chemical absorbing can be suppressed when too low to balance, cause pollutant removing efficiency to be maintained at low-level, it is impossible to meet environmental protection index.Invention
People has found that after the Shi of system tests Yan Jiu ﹑ theoretical researches and detection and analysis the pH of solution is between 2.0-7.0.
Solution temperature is too high to cause peroxide to occur to shift to an earlier date the oxidant that selfdecomposition wastes costliness, and 75 DEG C is inventor
It is according to the optimal critical temperature obtained after orthogonal experiment and comprehensive analysis, big more than peroxide decomposition rate after the critical temperature
Amplitude increases, and the removal efficiency of pollutant significantly declines.Therefore, not higher than 75 DEG C of solution temperature,
The research of inventor finds that the content of VOCs is too high in flue gas will cause removal efficiency significantly to decline, and afterbody is not
Absorbed VOCs escapes amount is increased considerably, and is easily caused serious secondary pollution, therefore is found after research, in waste gas
The content of VOCs is not higher than 2000mg/m3.The carbon residue solution that reaction is produced is separated by filtration into afterbody knockout tower, residual after separation
Charcoal can be used as fuel after entering drying tower drying.
It is significant to note that：Various parameters optimization selected above, are that inventor closes Shi Yan ﹑ by substantial amounts of Zong
Just obtain after Theoretical Calculation and detection and analysis.As each operating parameter generally also suffers from other one or more parameters
Combined influence or interference, therefore cannot be obtained by simple scene experiment of single factor or document contrast.The present invention is provided in addition
Parameters optimization be to determine after Comprehensive Correlation on equipment in mini-plant and after amplifying, considered equipment amplification process
Issuable " enlarge-effect ", therefore field technician can not speculate after to existing equipment simple analysis that acquisition safety can
The parameters optimization leaned on.
Preferred technical scheme, the exhaust gas entrance temperature for clashing into bed is 50 DEG C, and liquid-gas ratio is 4.5L/m3, hydrogen peroxide concentration
For 1.0mol/L, pH value of solution is 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation
Intensity is 60 μ W/cm2, ultraviolet effective wavelength is 254nm.
Preferred technical scheme, the exhaust gas entrance temperature for clashing into bed is 50 DEG C, and liquid-gas ratio is 4.5L/m3, Ammonium persulfate. is dense
Spend for 1.0mol/L, pH value of solution is 2.5, solution temperature is 50 DEG C, in waste gas, toluene level is 300mg/m3, the effective spoke of ultraviolet light
Intensity is penetrated for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.
Preferred technical scheme, the exhaust gas entrance temperature for clashing into bed is 50 DEG C, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration
For 0.5mol/L, pH value of solution is 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation
Intensity is 40 μ W/cm2, ultraviolet effective wavelength is 254nm.
Preferred technical scheme, the exhaust gas entrance temperature for clashing into bed is 50 DEG C, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration
For 1.0mol/L, pH value of solution is 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation
Intensity is 40 μ W/cm2, ultraviolet effective wavelength is 254nm.
Preferred technical scheme, the exhaust gas entrance temperature for clashing into bed is 50 DEG C, and liquid-gas ratio is 4.5L/m3, Ammonium persulfate. is dense
Spend for 1.0mol/L, pH value of solution is 2.5, solution temperature is 50 DEG C, in waste gas, content of formaldehyde is 300mg/m3, the effective spoke of ultraviolet light
Intensity is penetrated for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.
Described peroxide is one or more in Shuan Yang Shui ﹑ Guo Liu Suan An ﹑ sodium peroxydisulfates and potassium peroxydisulfate
Mixing.Described emission source is coal-burning boiler, incinerator, petrochemical equipment, and biomass combustion boiler and medical treatment are useless
Any one in gurry incinerator.
Advantages of the present invention and remarkable result (with prior art or Patent Reference)：
1. according to internationally famous chemical industry expert Danckwerts[1]Research with Zhang Chengfang professors finds[2], for rapid
Reaction system is learned, the rate-determining steps of whole pollutant removing are concentrated mainly on mass transfer link, i.e., if it is desired to increasing substantially pollution
The mass transfer rate of the necessary preferential consolidation system of the removal efficiency of thing.Due to traditional bubble tower and spray column mass transfer rate compared with
It is low, it is impossible to meet the high-speed chemical reaction system of free radical initiation.In addition, the research table of the famous scholar Wu Yuan professors of China
It is bright[2], under the same terms, the mass transfer rate of bed is clashed into than bubbling bed and sprays more than height of bed an order of magnitude, with high
Mass transfer rate, is very suitable for the fast chemical reaction system of free radical initiation.The system realizes 100% pollutant removing
It is a kind of superior gas-liquid reactor that efficiency is provable shock bed, is suitable for the fast reaction system of free yl induction.Therefore,
Inventor proposes that will clash into bed is combined for removing the hydrogen sulfide in flue gas with free radical fast reaction system, is had substantially first
Novelty and practical value, it may have good development potentiality and market prospect.
(list of references：[1]Danckwerts,P.V.Gas-Liquid Reactions.New York:McGraw-
Hill,1970；[2] Zhang Chengfang. gas liquid reaction and reactor [M]. Beijing:Chemical Industry Press, 1985.；[3] Wu Yuan. hit
Hit stream-principle property application [M]. Beijing:Chemical Industry Press, 2005.)
2. Chinese patent (ZL201210431594.2) proposes a kind of method that utilization electrolysis process removes VOCs, but should
Method system and complex process, power consumption and application cost are high.The method of the free radical removing VOCs that the present invention is adopted is very simple,
Subtractive process is reliable and stable, and application cost is relatively low.
3. Chinese patent (ZL 201410247572.X) proposes what a kind of utilization Xi Fu ﹑ condensations and membrance separation combined
VOCs removal methods and technique, but the method complex process, application cost are high, and especially the membrane separation technique of afterbody is unstable,
Commercial Application is difficult to, and technique proposed by the present invention is relatively easy, equipment mature and reliable, with good market development and application
Prospect.
4. Chinese patent (ZL201210263021.3) proposes one kind based on Xi Fu ﹑ Tuo Fu ﹑ rectification and infiltration evaporation point
From VOCs removal methods and technique, but the method equally have the deficiency such as complex process and application cost height, it is difficult to realize work
Industry application, and technique proposed by the present invention is relatively more simple and reliable, with more preferable DEVELOPMENT PROSPECT.
5. Chinese patent (ZL201210334393.0) is proposed one kind and is combined based on Xi Fu ﹑ membrance separation and condensation technology
VOCs removal methods and technique.The method has the deficiency such as complex process and application cost height, it is impossible to realize application.
6. Chinese patent (ZL201410007192.9) proposes a kind of molecular sieve/titanium dioxide that can effectively remove VOCs
The method for preparing catalyst and corresponding removing process of supported copper manganese cerium, but the method for preparing catalyst that the patent application is proposed is non-
Often complicated, absorbent stability is not high, needs regularly to regenerate and activate, and method of the present invention need not prepare complexity
Scavenger and regeneration activating operation, and operational reliability is higher, the continuous operation of feasible system, sends out with more preferable industry
Exhibition prospect.
Description of the drawings
A kind of general figure of electron spin resonance light (hydrogen peroxide solution) based on free radical advanced oxidation of Fig. 1.
A kind of general figure of electron spin resonance light (ammonium persulfate solution) based on free radical advanced oxidation of Fig. 2.
Fig. 3 is the process chart of present system.
Fig. 4 is the structural representation that high speed nozzle and ultraviolet lamp tube arrangement in bed are clashed in the present invention.
Fig. 5 is the structural representation of high speed nozzle.
Specific embodiment
As shown in figure 3, the VOCs removal methods said method based on free radical advanced oxidation adopts following equipment, it is described
System is provided with 1 ﹑ blower fans of VOCs emission sources, 2 ﹑ waste gas thermostat, 3 ﹑ and clashes into 11 ﹑ high speed nozzles of bed, 13 ﹑ uviol lamps 14 and quartzy sleeve pipe ﹑
12 ﹑ circulating pumps 1 of demister and 2 10 ﹑ oxidants of circulating pump addition 6 ﹑ of tower 7 and 15 ﹑ knockout towers of fluid infusion pump 8 ﹑ chimneys, 16 ﹑ valves
Drying tower 5 and smoke waste heat utilization system 4.
In oxidant addition tower 7, Jing clashes into the entrance a of bed 11 and is passed through shock bed by fluid infusion pump 8 peroxide solutions
11 bottoms.
The flue gas Jing blower fans 2 containing VOCs waste gas from the discharge of emission source 1 introduce waste gas thermostat 3, the Jing of waste gas containing VOCs
After 3 homoiothermic of waste gas thermostat, respectively enter two pipelines and be separated into two parts, portion is mixed with part peroxide solutions
Shock bed 11 is sprayed into by high speed nozzle 13 by entrance b by solution circulation pump 1 afterwards.Another part waste gas and another part peroxide
Shock bed 11 is sprayed into by high speed nozzle 13 by entrance c by solution circulation pump 2 10 after the mixing of compound solution.The gas of two bursts of atomizations
Liquid mixture is clashing into 11 interior generation of bed to impingement mix.
Uviol lamp 14 gives off ultraviolet light, and the peroxide generation hydroxyl or sulfate radical in ultraviolet radiation decomposing solution is certainly
By base oxidation removal VOCs, react the carbon residue solution that produces and filtered point into afterbody knockout tower tower 6 by the outlet d of bed 11 is clashed into
From the carbon residue after separation enters drying tower 5 can be used as the carbon residue of fuel by the use of the drying generation of exhaust heat utilization system 4.It is net
The waste gas of change Jing after 12 demisting of demister at the top of shock bed is passed through chimney 16 and is entered air by outlet e.
As shown in figure 4, the high speed nozzle 13 and ultraviolet lamp tube 14 that clash in bed 11 are arranged using multi-stage cross；Spray at a high speed
Mouth 13 and 14 alternate arrangement of ultraviolet lamp tube；Vertical interval H between 13 adjacent two layers of high speed nozzle is located between 10cm-80cm,
And adjacent two-stage is using 90 degree of arranged crosswises for staggering；Ultraviolet lamp tube 14 is arranged in the central point between adjacent two-stage high speed nozzle
Place, adjacent two-stage is using 90 degree of arranged crosswises for staggering.Quartz socket tube is set on ultraviolet lamp tube 14, primarily serves protection ultraviolet
The effect of fluorescent tube 14.
As shown in figure 5, the structural representation of high speed nozzle 13, two of which high speed nozzle 13 is symmetrical；High speed nozzle
13 include hydrogen peroxide solution entrance k and smoke inlet m and jet expansion n, are all passed through the entrance of high speed nozzle 13, oxygen aqueous solution
Entrance k and smoke inlet m is passed through inside high speed nozzle 13, after 13 inside premixing of high speed nozzle, by going out for high speed nozzle 13
Mouth n sprays, and the power is provided by circulating pump 1 and circulating pump 2 10.
It is 50 DEG C that embodiment 1. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration is
0.5mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, toluene level is 400mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 68.5%.
It is 50 DEG C that embodiment 2. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, ammonium persulfate concentrations are
0.5mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, toluene level is 400mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 61.1%.
It is 50 DEG C that embodiment 3. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration is
0.5mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 75.8%.
It is 50 DEG C that embodiment 4. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, ammonium persulfate concentrations are
0.5mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 72.9%.
It is 50 DEG C that embodiment 5. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration is
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 85.8%.
It is 50 DEG C that embodiment 6. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 2.5L/m3, ammonium persulfate concentrations are
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 40 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 92.9%.
It is 50 DEG C that embodiment 7. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 4.5L/m3, hydrogen peroxide concentration is
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 100%.
It is 50 DEG C that embodiment 8. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 4.5L/m3, ammonium persulfate concentrations are
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 100%.
It is 50 DEG C that embodiment 9. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 4.5L/m3, hydrogen peroxide concentration is
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, toluene level is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 100%.
It is 50 DEG C that embodiment 10. clashes into the exhaust gas entrance temperature of bed, and liquid-gas ratio is 4.5L/m3, ammonium persulfate concentrations are
1.0mol/L, pH value of solution are 2.5, and solution temperature is 50 DEG C, and in waste gas, toluene level is 300mg/m3, ultraviolet light Net long wave radiation is strong
Spend for 60 μ W/cm2, ultraviolet effective wavelength is 254nm.Its removal efficiency reaches 100%.
Understand that embodiment 7-10 has preferable removal effect, and removal efficiency is equal through the Comprehensive Correlation of above example
100% is reached, can be consulted and used as most preferred embodiment.
Claims (4)
1. a kind of VOCs removal methods based on free radical advanced oxidation, it is characterised in that：Described method is from emission source
Waste gas through waste gas thermostat adjust temperature after respectively enter two flues, waste gas is separated into two parts, described two parts
Waste gas is sprayed into by high speed nozzle after being mixed to form the gas-liquid mixture of atomization respectively with peroxide solutions and clashes into bed；Described two
Divide gas-liquid mixture from shock bed is coaxially sprayed into the high speed nozzle to arrangement, the gas-liquid mixtures of two bursts of atomizations are in shock bed
Occur to be located at the vertical center line for clashing into bed to the shock equilibrium point to impingement mix, the gas-liquid mixture of two bursts of atomizations
On；Ultraviolet radiation peroxynitrite decomposition compound produces hydroxyl or potentiometric titrations oxidation removal VOCs, reacts the carbon residue for producing molten
Liquid is separated by filtration into afterbody knockout tower, and the carbon residue after separation can be used as fuel after entering drying tower drying；Clash into bed
Exhaust gas entrance temperature is 50 DEG C, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration is 0.5mol/L, and pH value of solution is 2.5, solution temperature
For 50 DEG C, in waste gas, content of formaldehyde is 300mg/m3, the ultraviolet light Net long wave radiation intensity is 20 μ W/cm2-500μW/cm2, it is purple
Outside line effective wavelength is 160nm-290nm；Or the exhaust gas entrance temperature of shock bed is 50 DEG C, the waste gas is molten with peroxide
Effective liquid-gas ratio of liquid is 2L/m3-12L/m3, the concentration of peroxide is the pH positions of solution between 0.5mol/L-2.5mol/L
Between 2.0-7.0, not higher than 75 DEG C of solution temperature, in waste gas, the content of VOCs is not higher than 2000mg/m3；The ultraviolet light has
Effect radiant intensity is 20 μ W/cm2-500μW/cm2, ultraviolet effective wavelength is 160nm-290nm.
2. a kind of VOCs removal methods based on free radical advanced oxidation, it is characterised in that：Described method is from emission source
Waste gas through waste gas thermostat adjust temperature after respectively enter two flues, waste gas is separated into two parts, described two parts
Waste gas is sprayed into by high speed nozzle after being mixed to form the gas-liquid mixture of atomization respectively with peroxide solutions and clashes into bed；Described two
Divide gas-liquid mixture from shock bed is coaxially sprayed into the high speed nozzle to arrangement, the gas-liquid mixtures of two bursts of atomizations are in shock bed
Occur to be located at the vertical center line for clashing into bed to the shock equilibrium point to impingement mix, the gas-liquid mixture of two bursts of atomizations
On；Ultraviolet radiation peroxynitrite decomposition compound produces hydroxyl or potentiometric titrations oxidation removal VOCs, reacts the carbon residue for producing molten
Liquid is separated by filtration into afterbody knockout tower, and the carbon residue after separation can be used as fuel after entering drying tower drying；Clash into bed
Exhaust gas entrance temperature is 50 DEG C, and liquid-gas ratio is 4.5L/m3, hydrogen peroxide concentration is 1.0mol/L, and pH value of solution is 2.5, solution temperature
For 50 DEG C, in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation intensity is 60 μ W/cm2, ultraviolet effective wavelength is
254nm；Or the exhaust gas entrance temperature of shock bed is 50 DEG C, liquid-gas ratio is 4.5L/m3, ammonium persulfate concentrations are 1.0mol/L,
PH value of solution is 2.5, and solution temperature is 50 DEG C, and in waste gas, toluene level is 300mg/m3, ultraviolet light Net long wave radiation intensity is 60 μ W/
cm2, ultraviolet effective wavelength is 254nm.
3. a kind of VOCs removal methods based on free radical advanced oxidation, it is characterised in that：Described method is from emission source
Waste gas through waste gas thermostat adjust temperature after respectively enter two flues, waste gas is separated into two parts, described two parts
Waste gas is sprayed into by high speed nozzle after being mixed to form the gas-liquid mixture of atomization respectively with peroxide solutions and clashes into bed；Described two
Divide gas-liquid mixture from shock bed is coaxially sprayed into the high speed nozzle to arrangement, the gas-liquid mixtures of two bursts of atomizations are in shock bed
Occur to be located at the vertical center line for clashing into bed to the shock equilibrium point to impingement mix, the gas-liquid mixture of two bursts of atomizations
On；Ultraviolet radiation peroxynitrite decomposition compound produces hydroxyl or potentiometric titrations oxidation removal VOCs, reacts the carbon residue for producing molten
Liquid is separated by filtration into afterbody knockout tower, and the carbon residue after separation can be used as fuel after entering drying tower drying；Clash into bed
Exhaust gas entrance temperature is 50 DEG C, and liquid-gas ratio is 2.5L/m3, hydrogen peroxide concentration is 1.0mol/L, and pH value of solution is 2.5, solution temperature
For 50 DEG C, in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation intensity is 40 μ W/cm2, ultraviolet effective wavelength is
254nm；Or the exhaust gas entrance temperature of shock bed is 50 DEG C, liquid-gas ratio is 4.5L/m3, ammonium persulfate concentrations are 1.0mol/L,
PH value of solution is 2.5, and solution temperature is 50 DEG C, and in waste gas, content of formaldehyde is 300mg/m3, ultraviolet light Net long wave radiation intensity is 60 μ W/
cm2, ultraviolet effective wavelength is 254nm.
4. a kind of VOCs removal methods based on free radical advanced oxidation according to claim 1, it is characterised in that：It is described
Emission source be coal-burning boiler, incinerator, petrochemical equipment, in biomass combustion boiler and linked medical waste incinerator
Any one.
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| CN105833676B (en) * | 2016-04-18 | 2018-11-06 | 江苏大学 | The method and device of VOCs in a kind of light radiation chlorine atom and hydroxyl removing exhaust gas |
| CN106166438B (en) * | 2016-04-18 | 2018-12-14 | 江苏大学 | A kind of method and device of photodissociation chlorine aqueous solution induced radical removing hydrogen sulfide |
| CN107261764A (en) * | 2017-08-08 | 2017-10-20 | 湖南云平环保科技有限公司 | VOCs controlling devices and method |
| CN107670487A (en) * | 2017-11-13 | 2018-02-09 | 凡邸（天津）环保科技有限公司 | A kind of method based on bioelectrochemistry/advanced oxidation Fourier Series expansion technique degradation of formaldehyde |
| CN110124484A (en) * | 2019-04-16 | 2019-08-16 | 浙江大学 | A kind of persulfate activation combines the device and method of UV light-induced degradation organic waste gas |
| CN115888649B (en) * | 2022-11-16 | 2024-03-19 | 江苏大学 | Method and device for adsorbing VOCs (volatile organic compounds) by using active component modified biochar based on high-energy radiation induction |
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