CN101549283A - An in situ regeneration method of activated carbon fiber - Google Patents
An in situ regeneration method of activated carbon fiber Download PDFInfo
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- CN101549283A CN101549283A CNA2009100829521A CN200910082952A CN101549283A CN 101549283 A CN101549283 A CN 101549283A CN A2009100829521 A CNA2009100829521 A CN A2009100829521A CN 200910082952 A CN200910082952 A CN 200910082952A CN 101549283 A CN101549283 A CN 101549283A
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Abstract
The invention relates to an in situ regeneration method of activated carbon fiber, especially for dealing with the activated carbon fiber regeneration of gaseous pollutants. The invention specifically uses the plasma generated in the adsorption unit by the low-frequency AC power. Plasma oscillations and electric wind shake or blow off the adsorbate from the activated carbon fiber, while the heat released by the plasma works for adsorbate desorption. The desorbed gaseous pollutant molecules conduct chemical reaction with the high-energy electrons generated by discharge, nuclear particles, free radicals and ozone, and are eventually degraded to harmless gas for emission, and do not produce secondary pollution. The activated carbon fiber after regeneration maintains the original activity and may again be put into use. The invention features high regeneration efficiency and low carbon loss and the regenerated adsorption activity will not be reduced.
Description
Technical field
The present invention relates to a kind of situ regeneration method of activated carbon fiber, especially for the activated carbon fiber regeneration of handling gaseous contaminant.
Technical background
Activated carbon fiber is a kind of more novel high-efficiency adsorbent.It is the fiber-reactive charcoal of the various forms that are mixed and made into ultra-fine micro activated carbon particle and various cellulose, artificial silk, paper pulp etc.Range of micropores is at 0.5-1.4 μ m, and specific area is big.Organic matter in various inorganic and organic gas, the aqueous solution, heavy metal ion etc. had the bigger adsorbance and the rate of adsorption faster; its adsorption capacity is than the high 1-10 of general active carbon times, and particularly the adsorbance to some odorants will exceed about 40 times than granular activated carbon.Being mainly used in Gas Phase Adsorption at present, is the adsorbent with important commercial value.
Need regeneration cycle to use after activated carbon fiber absorption is saturated.Existing renovation process mainly comprises thermal regeneration, decompression regeneration, purges regeneration, displacement regeneration and solvent extraction regeneration etc.The thermal regeneration method is meant will the heating of the saturated adsorbent of absorption, and along with adsorbent temperature raises, molecular motion is accelerated, and equilibrium adsorption capacity reduces, most of adsorbate method that just desorption comes out from the adsorbent.Heat medium mostly is steam, also can be hot-air.Thermal regeneration is used for the desorption of non-polar adsorbent more, behind charcoal absorption purification organic solvent steam, both can adopt this kind mode desorption, and recyclable organic solvent.The decompression method of reproduction is meant the pressure that lowers saturated adsorbent ambient gas, the method that adsorbate desorption from the adsorbent is come out.Decompression regeneration is suitable for the transformation adsorption operations and equilibrium adsorption capacity is the occasion of linear relationship with the adsorbate dividing potential drop.This method needs the transformation operation, and power consumption is big, thereby adopts less in the adsorption cleaning of gaseous contaminant.Purge regeneration be meant purge with the gas (inert gas) that is not adsorbed saturated adsorbent bed, and the renovation process that the adsorbate that desorption comes out is taken away.This renovation process desorption degree is poor, and adsorption density is lower in the purge gas, reclaims difficulty.Therefore, this method is not generally used separately.Displacement regeneration is meant selects suitable gas (desorbing agent), adsorbate is replaced the method for coming out with stripping.This method need add a procedure, i.e. the desorption again of desorbing agent is so that adsorbent recovers adsorption capacity.This method is applicable to thermally sensitive material.Solvent extraction regeneration is meant selects suitable solvent, makes the solubility property of adsorbate in this solvent much larger than the suction-operated of adsorbent to adsorbate, adsorbate is dissolved the method for getting off.
Above renovation process all exists following some deficiency to some extent: the charcoal loss is often bigger in (1) regenerative process; (2) regeneration back carbon fiber adsorption and catalytic combustion ability can descend to some extent; (3) if when regeneration the tail gas that produces deal with improperly and can cause secondary pollution.
Summary of the invention
At the deficiency of above renovation process, the invention provides a kind of plasma in situ regeneration method, this method regeneration efficiency height, the charcoal loss amount is low, non-secondary pollution.
For achieving the above object, the present invention has taked following technical scheme.Corona electrode and earth electrode at first are set in adsorbent equipment, and NACF is placed between corona electrode and the earth electrode; Then corona electrode is linked to each other with AC power, the electric field between corona electrode and the earth electrode makes and produces plasma in the adsorbent equipment, and plasma oscillation and electric wind effect are shaken adsorbate and taken off or stripping gets off from NACF; After reaching the predefined recovery time, corona electrode and AC power are disconnected regeneration ending.
The frequency of described AC power is 100～200Hz, and the electric-field intensity between corona electrode and the earth electrode is 5～7.5kV/cm, and the recovery time is 2～5min.
The present invention utilizes low-frequency ac power to produce plasma in adsorbent equipment, and plasma oscillation and electric wind effect are shaken adsorbate and taken off or stripping gets off from NACF, and the heat that discharges of plasma provides desorption heat for the adsorbate desorption simultaneously.The gaseous contaminant molecule behind the desorption and the high energy electron of discharge generation, nuclear power particle, free radical and ozone generation chemical reaction finally are degraded to innocuous gas and discharge, and do not produce secondary pollution.Activated carbon fiber after the regeneration has kept original activity, can come into operation once more.
The present invention adopts the low temperature plasma in situ regeneration method of activated carbon fiber, is because plasma has following characteristics:
1) plasma oscillation effect.If the space charge of plus or minus has appearred in moment in a certain regional area of plasma, these electric charges are with starting oscillation so.Plasma oscillation is the organized collective motion that the interaction by population in the plasma forms.The gaseous contaminant molecule that is adsorbed on the activated carbon fiber can shake under the effect of plasma oscillation from micropore, realizes desorption.
2) electric wind effect.Under the extra high situation of extra electric field intensity, air generation ionization.Because like charges is mutually exclusive, the electrostatic charge on the conductor always distributes from the teeth outwards, and in general to distribute be uneven, and this makes remaining a small amount of ion generation accelerated motion in the air.After ion that these are accelerated and air molecule collide, make the more air molecular ionization, form electron avalanche.The electronics of high-speed motion and nuclear power particle can make its ambient air generation flow perturbation, and then form electric wind, and electric wind can come out the gaseous contaminant molecule stripping that part is adsorbed on the activated carbon fiber, realizes desorption.
3) plasma exothermic effects.By the plasma thermodynamic equilibrium state, plasma can be divided into complete thermodynamical equilibrium plasma, local thermodynamic equilibrium plasma and non-equilibrium thermodynamics plasma.Non-equilibrium thermodynamics plasma also claims cold plasma or low temperature plasma, and this type of plasma internal electron temperature is very high, can reach Kelvins up to ten thousand, and ion and gas temperature remains on 300～500K, thereby forms the non-equilibrium property on the thermodynamics.What the present invention adopted is lower temperature plasma technology, even but the plasma under the low temperature meaning when discharge time during long enough, still can make the higher temperature that reaches 450～500K in the electric field, thus provide sufficient desorption heat for desorption.
4) plasma degradation effect.Plasma has the effect of degradation of contaminant molecule, and its mechanism is as follows: one, and the direct and contaminant molecule collision by the electronics of electric field generation, thus make contaminant molecule ionization, dissociate and excite; Its two, chemical action takes place between various active groups and the contaminant molecule, these active groups mainly comprise OH, HO
2With the O atom, a series of chemical reaction takes place between they and the contaminant molecule, form CO
2And H
2The material of environmental sounds such as O.
Low temperature plasma in situ regeneration method of activated carbon fiber of the present invention and existing method relatively have following marked improvement:
1) regeneration efficiency height.At electric field strength 5-7.5kV/cm, in the scope of discharge frequency 100-250Hz, regeneration efficiency reaches more than 99.5%;
2) activated carbon fiber regeneration charcoal loss amount is low.Under optimal operating parameter, the regenerated carbon loss is lower than 0.2%;
3) regeneration back adsorption activity does not reduce.Experiment showed, that the activated carbon fiber after this method is repeatedly regenerated can keep original adsorption activity;
4) pollutant original position degraded need not add the desorption gas treating apparatus, and technology is simple, and is easy to operate, do not produce secondary pollution.
Description of drawings
Fig. 1 be among the present invention supply frequency to the influence of NACF regeneration effect
Fig. 2 be among the present invention electric-field intensity to the influence of NACF regeneration effect
Fig. 3 be among the present invention the recovery time to the influence of NACF regeneration effect
Fig. 4 is a regenerating unit structural representation of the present invention
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
The concrete structure of adsorbent equipment the annular sorbent tube that comprises housing 15, top cover 8, surrounded by porous urceolus 7 and porous inner cylinder 5, is arranged on the activated carbon fiber 6 in the annular sorbent tube as shown in Figure 4.Top cover 8 and housing 15 are connected by flange, and sorbent tube is arranged in the housing 15, and NACF 6 is arranged in the sorbent tube.
Corona electrode and earth electrode at first are set in adsorbent equipment, and NACF placed between corona electrode and the earth electrode, be specially: the adpting flange at housing 15 and top cover 8 places is opened, corona electrode 12 is arranged on the axis of sorbent tube, earth electrode 13 is fixed on the inwall of housing 15, and insulated liner 14 places between earth electrode 13 and the housing 15.
Then corona electrode is linked to each other with AC power 9, the electric field between corona electrode and the earth electrode makes and produces plasma in the adsorbent equipment, and plasma oscillation and electric wind effect are shaken adsorbate and taken off or stripping gets off from NACF.After reaching the predefined recovery time, corona electrode and AC power are disconnected regeneration ending.
The frequency of AC power is 100～200Hz (hertz), and the electric-field intensity between corona electrode and the earth electrode is 5～7.5kV/cm (kv/cm), the recovery time be 2～5min (minute).
According to the method described above, done following experiment:
Plasma is taken place by corona discharge by low-frequency ac power, and supply frequency is adjustable continuously in 50～500Hz scope, and electric-field intensity is controlled in 4～8kV/cm scope adjustable continuously by supply voltage.The using plasma technology is regenerated to the NACF of adsorption of hydrogen sulfide among the embodiment, changes discharge frequency, electric-field intensity and recovery time, to obtain the technological parameter of best regeneration effect.Fig. 1 is the influence of supply frequency to the NACF regeneration effect, and electric-field intensity is 7.5kV/cm, and the recovery time is 2min, and supply frequency is respectively 50Hz, 100Hz, 150Hz, 200Hz and 250Hz.Along with the increase NACF desorption rate and the charcoal loss late of frequency all increases.When frequency was 50Hz, desorption rate only was 63.5%, and the charcoal loss late is 0.1%.When frequency was 100Hz, desorption rate was 99.5%, and the charcoal loss late is 0.3%.When frequency was brought up to 250Hz, desorption rate increased very little, and the charcoal loss late has been increased to 2.7%.It is relatively more reasonable to this shows that supply frequency is controlled in the 100Hz-200Hz scope.Fig. 2 is the influence of electric-field intensity to the NACF regeneration effect, and fixed-frequency is at 150Hz, and the recovery time is 3min, and field intensity is respectively 4kV/cm, 5kV/cm and 7.5kV/cm.Along with the increase NACF desorption rate and the charcoal loss late of field intensity all increases.When field intensity was 4kV/cm, desorption rate only was 46%, and the charcoal loss late is 0.06%.When field intensity was 5kV/cm, desorption rate brought up to 99.5%, and the charcoal loss late is 0.15%.When field intensity reached 7.5kV/cm, desorption rate remained unchanged, and still was 99.5%, and the charcoal loss late also is in reduced levels, only increases to 0.9%.It is relatively more reasonable to this shows that electric-field intensity is controlled in 5kV/cm～7.5kV/cm scope.Fig. 3 is the influence of recovery time to the NACF regeneration effect, and frequency is 150Hz, and field intensity is 5kV, and the recovery time is respectively 1min, 2min, 3min and 5min.Along with increase NACF desorption rate and the charcoal loss late of recovery time all increases.When the recovery time was 1min, desorption rate was 88%, and the charcoal loss late is 0.05%.When the recovery time was 2min, desorption rate brought up to 99%, and the charcoal loss late is 0.15%.When the recovery time was 5min, desorption rate was 99.5%, and the charcoal loss late is 0.5%.It is relatively more reasonable to this shows that the recovery time is controlled in the 2min-5min scope.
Above-mentioned low-frequency ac power is a kind of low temperature non-equilibrium plasma by the formed plasma of corona discharge, its gaseous contaminant that desorption is come out (as VOCs and foul gas etc.) has good decomposition effect, do not produce secondary pollution, can really realize the in-situ regeneration of NACF.
Claims (2)
1, a kind of NACF in situ regeneration method is characterized in that: corona electrode and earth electrode at first are set in adsorbent equipment, and NACF is placed between corona electrode and the earth electrode; Then corona electrode is linked to each other with AC power, electric field between corona electrode and the earth electrode makes and produces plasma in the adsorbent equipment, plasma oscillation and electric wind effect are shaken adsorbate and are taken off or stripping gets off from NACF, the gaseous contaminant under the desorption and then be broken down into innocuous gas; After reaching the recovery time, corona electrode and AC power are disconnected regeneration ending.
2, a kind of NACF in situ regeneration method according to claim 1, it is characterized in that: the frequency of described AC power is 100～200Hz, and the electric-field intensity between corona electrode and the earth electrode is 5～7.5kV/cm, and the recovery time is 2～5min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188879A (en) * | 2011-05-06 | 2011-09-21 | 中国矿业大学(北京) | Method for purifying and recycling mercury in flue gas |
| CN111111433A (en) * | 2019-12-31 | 2020-05-08 | 赵梓权 | Photocatalytic gas purification method and system |
| CN116688967A (en) * | 2023-07-25 | 2023-09-05 | 清徐泓博污水处理有限公司 | Multi-degree-of-freedom activated carbon regenerator based on DBD plasma and application method |
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2009
- 2009-04-24 CN CN2009100829521A patent/CN101549283B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102188879A (en) * | 2011-05-06 | 2011-09-21 | 中国矿业大学(北京) | Method for purifying and recycling mercury in flue gas |
| CN102188879B (en) * | 2011-05-06 | 2012-12-19 | 中国矿业大学(北京) | Method for purifying and recycling mercury in flue gas |
| CN111111433A (en) * | 2019-12-31 | 2020-05-08 | 赵梓权 | Photocatalytic gas purification method and system |
| CN116688967A (en) * | 2023-07-25 | 2023-09-05 | 清徐泓博污水处理有限公司 | Multi-degree-of-freedom activated carbon regenerator based on DBD plasma and application method |
| CN116688967B (en) * | 2023-07-25 | 2023-10-13 | 清徐泓博污水处理有限公司 | Multi-degree-of-freedom activated carbon regenerator based on DBD plasma and application method |
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