CN113813940A - Saturated activated carbon activation regeneration treatment process and control method - Google Patents
Saturated activated carbon activation regeneration treatment process and control method Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 76
- 230000008569 process Effects 0.000 title claims abstract description 66
- 230000004913 activation Effects 0.000 title claims abstract description 56
- 238000011069 regeneration method Methods 0.000 title claims abstract description 41
- 230000008929 regeneration Effects 0.000 title claims abstract description 34
- 238000001994 activation Methods 0.000 claims abstract description 56
- 238000010521 absorption reaction Methods 0.000 claims abstract description 54
- 239000002912 waste gas Substances 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000003795 desorption Methods 0.000 claims abstract description 27
- 238000013033 photocatalytic degradation reaction Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 230000001699 photocatalysis Effects 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- -1 superoxide ion Chemical class 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000003093 cationic surfactant Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 231100000252 nontoxic Toxicity 0.000 claims description 3
- 230000003000 nontoxic effect Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 5
- 229910052740 iodine Inorganic materials 0.000 description 5
- 239000011630 iodine Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000000746 purification Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004380 ashing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
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- B01D2259/00—Type of treatment
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- B01D2259/804—UV light
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Abstract
The invention discloses a saturated activated carbon activation regeneration treatment process, which comprises the following steps: 1) filling saturated activated carbon into an activation furnace, closing a furnace door, starting a saturated activated carbon activation regeneration system, and heating and desorbing the activated carbon by adopting a hot air circulation desorption regeneration process; 2) waste gas generated after the activated carbon desorption is collected by a collecting system and is discharged after being sequentially treated by a condensation precipitation liquid collecting process, an absorption liquid absorbing process and a photocatalytic degradation process; wherein, the hot air circulation desorption regeneration process comprises the following steps: a) the activation furnace starts to heat and the circulating fan starts to work at the same time; b) when the temperature of the activation furnace continuously rises to 70 ℃, the induced draft fan starts to work, when the temperature of the activation furnace continuously rises to 110 ℃, the constant temperature desorption stage is reached, the activation furnace stops heating and naturally cools to room temperature, and then all equipment is closed to finish activation; the invention prolongs the service life of the active carbon, reduces the cost and improves the waste gas treatment efficiency.
Description
Technical Field
The invention relates to the technical field of activated carbon activation processes, in particular to a saturated activated carbon activation regeneration treatment process and a control method.
Background
Activated carbon is a porous adsorption material and is widely applied to the fields of waste gas purification treatment and the like, at present, the activated carbon adsorption purification process is relatively mature, the usage amount of the activated carbon is increased day by day, the output of waste activated carbon is increased continuously, but the activated carbon adsorption has short usage period (average 4-5 months) and high replacement cost, the saturated activated carbon is high in treatment cost as dangerous solid waste, and a large amount of waste activated carbon can not only cause waste of resources but also cause secondary pollution to the environment if the waste activated carbon is not recycled, and the activated carbon is regenerated, namely the activated carbon which is saturated and adsorbs various pollutants is specially treated to recover most adsorption capacity of the activated carbon so as to be reused in the adsorption process of waste gas purification equipment, reduce the operation production cost and the waste of resources, so that the activated carbon has very important environmental benefit and economic benefit, at present, waste gas discharged by laboratories of colleges and universities and scientific research institutions has high complex components and mainly contains organic component pollutants such as benzenes, ketones, alcohols, aldehydes, ethers, alkanes, olefins and the like, mainstream active carbon regeneration methods include a thermal regeneration method, a biological regeneration method, a chemical agent regeneration method, an ultrasonic regeneration method, a microwave radiation regeneration method and the like, and the thermal regeneration method is the most widely and mature regeneration technology at present, but has some defects such as low desorption efficiency, high energy consumption, low product quality and the like. Therefore, a saturated activated carbon activation regeneration treatment process and a control method are provided.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a saturated activated carbon activation regeneration treatment process and a control method.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a saturated activated carbon activation regeneration treatment process comprises the following steps:
1) filling saturated activated carbon into an activation furnace, closing a furnace door, starting a saturated activated carbon activation regeneration system, and heating and desorbing the activated carbon by adopting a hot air circulation desorption regeneration process;
2) waste gas generated after the activated carbon desorption is collected by a collecting system and is discharged after being sequentially treated by a condensation precipitation liquid collecting process, an absorption liquid absorbing process and a photocatalytic degradation process;
wherein, the hot air circulation desorption regeneration process comprises the following steps:
a) the activation furnace starts to heat and the circulating fan starts to work at the same time;
b) when the temperature of the activation furnace continuously rises to 70 ℃, the induced draft fan starts to work, and when the temperature of the activation furnace continuously rises to 110 ℃, the constant temperature desorption stage is reached;
c) and (3) keeping the temperature in the furnace to be about 110 ℃ and working at the constant temperature for four hours, ending the constant-temperature desorption stage, stopping heating the activation furnace, naturally cooling to room temperature, and then closing all equipment to finish activation.
Further, the condensed and precipitated liquid collecting process comprises the following steps:
1) the waste gas is filtered while being conveyed and condensed, so that partial impurities can be filtered while partial waste gas is condensed;
2) and continuously conveying the waste gas with part of impurities filtered to an absorption liquid absorption process.
Further, the absorption liquid absorption process includes the steps of:
1) the waste gas after partial impurities are filtered enters absorption liquid for absorption, and the absorption liquid is sprayed in a mist shape under the action of a spraying system, so that the waste gas overflowing from the absorption liquid is sprayed and absorbed again, and the absorption efficiency is improved;
2) and the absorbed waste gas is continuously conveyed to a photocatalytic degradation process.
Furthermore, the photocatalytic degradation process is to irradiate the nano TiO with ultraviolet light2On catalyst, nano TiO2The catalyst absorbs light energy to generate electron jump and hole jump, and further combines to generate electron-hole pairs to be adsorbed with moisture (H) on the surface of the exhaust gas2O) and oxygen (O)2) The hydroxyl free radical and the superoxide free radical with very active oxidability are generated by reaction, and the organic and inorganic matters in the waste gas are reduced into carbon dioxide (CO) under the action of photocatalytic oxidation2) Water (H)2O) and other non-toxic and harmless substances, and plays a role in purifying waste gas.
Further, the absorption liquid comprises, by weight, 80-90 parts of water, 2-3 parts of potassium carbonate, 1-1.5 parts of sodium humate, 0.7-1 part of acetic acid, 1-2 parts of a defoaming agent, 1-2 parts of a quaternary ammonium salt cationic surfactant and 3-3.5 parts of polyethylene glycol.
Furthermore, the absorption liquid is contained in the absorption container paved with the filler, so that the absorption efficiency of the absorption liquid is improved.
Further, the waste gas and the absorption liquid move reversely.
Furthermore, the waste gas is absorbed by the absorption liquid and sprayed, and then subjected to demisting treatment and photocatalytic degradation.
Further, in the natural cooling process in the step c), when the temperature in the activation furnace is reduced to be less than or equal to 70 ℃, the photocatalytic unit is closed, and when the temperature in the activation furnace is reduced to room temperature, the circulating fan, the induced draft fan and the spray pump are closed, so that the activation is completed.
The invention also provides a control method of the saturated activated carbon activation regeneration treatment process, which comprises the following steps:
1) the temperature in the furnace is collected through a sensor, the running state of the equipment is displayed on a touch screen in real time through TCP/IP communication, the monitoring function of the equipment is realized, and the temperature, the concentration and the time in the running process are controlled and adjusted through a PLC;
2) a user can set the temperature in the furnace, the heat preservation time, the temperature equipment of the induced draft fan and the like in a parameter setting area according to requirements;
3) the heat preservation time and the temperature in the furnace are observed through a main interface of the system, and the working states of the ultraviolet lamp, the induced draft fan, the air blower and the circulating pump are displayed in a system state area.
The invention uses hot air to sweep and adsorb saturated activated carbon, and the waste gas generated in the desorption process is treated by a specially designed purification device and then discharged up to the standard, thereby prolonging the service life of the activated carbon, reducing the cost, improving the waste gas treatment efficiency, and simultaneously reducing the harm of the saturated activated carbon and the waste gas to the environment and human body.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a line graph showing the relationship between the concentration of toluene at the outlet and the desorption time and the exhaust gas flow rate during the activated carbon regeneration process of the present invention;
FIG. 2 is a line graph showing the relationship between the concentration of outlet toluene, desorption time and desorption temperature in the process of activating and regenerating the activated carbon.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The embodiment provides a saturated activated carbon activation regeneration treatment process, which comprises the following steps:
1) filling saturated activated carbon into an activation furnace, closing a furnace door, starting a saturated activated carbon activation regeneration system, and heating and desorbing the activated carbon by adopting a hot air circulation desorption regeneration process;
2) waste gas generated after the activated carbon desorption is collected by a collecting system and is discharged after being sequentially treated by a condensation precipitation liquid collecting process, an absorption liquid absorbing process and a photocatalytic degradation process;
wherein, the hot air circulation desorption regeneration process comprises the following steps:
a) the activation furnace starts to heat and the circulating fan starts to work at the same time;
b) when the temperature of the activation furnace continuously rises to 70 ℃, the induced draft fan starts to work, and when the temperature of the activation furnace continuously rises to 110 ℃, the constant temperature desorption stage is reached;
c) and (3) keeping the temperature in the furnace to be about 110 ℃ and working at the constant temperature for four hours, ending the constant-temperature desorption stage, stopping heating the activation furnace, naturally cooling to room temperature, and then closing all equipment to finish activation.
The whole activation work is fully automatically controlled, the activation time is not less than 3 hours, and the activation temperature is 90-120 ℃; the recovery rate of the adsorption capacity of activated carbon is more than or equal to 90 percent, the ashing rate is less than or equal to 10 percent, and the strength of the activated carbon is more than or equal to 97 percent. The activated carbon activation energy consumption is less than or equal to 50KW.h/m3。
The condensing and precipitating liquid collecting process comprises the following steps:
1) the waste gas is filtered while being conveyed and condensed, so that partial impurities can be filtered while partial waste gas is condensed;
2) the waste gas with part of impurities filtered is continuously conveyed to an absorption liquid absorption process; the waste gas is condensed and then filtered, so that part of the waste gas and impurities in the waste gas can be separated and removed.
The absorption liquid absorption process comprises the following steps:
1) the waste gas after partial impurities are filtered enters absorption liquid for absorption, and the absorption liquid is sprayed in a mist shape under the action of a spraying system, so that the waste gas overflowing from the absorption liquid is sprayed and absorbed again, and the absorption efficiency is improved;
2) the absorbed waste gas is continuously conveyed to a photocatalytic degradation process; the absorption liquid comprises, by weight, 80-90 parts of water, 2-3 parts of potassium carbonate, 1-1.5 parts of sodium humate, 0.7-1 part of acetic acid, a defoaming agent, 1-2 parts of a quaternary ammonium salt cationic surfactant and 3-3.5 parts of polyethylene glycol; the absorption liquid is contained in the absorption container paved with the filler, so that the absorption efficiency of the absorption liquid is improved; the waste gas and the absorption liquid move reversely; the waste gas is absorbed and sprayed by absorption liquid, and then subjected to demisting treatment and photocatalytic degradation; waste gas and spraying system reverse contact to make absorption liquid and waste gas intensive mixing, improve the absorption efficiency of waste gas, the waste gas after the defogging is handled reaches dry effect, and its in-process effect at the photocatalytic degradation is better.
The photocatalytic degradation process is to irradiate the nano TiO with ultraviolet light2On catalyst, nano TiO2The catalyst absorbs light energy to generate electron jump and hole jump, and further combines to generate electron-hole pairs to be adsorbed with moisture (H) on the surface of the exhaust gas2O) and oxygen (O)2) The hydroxyl free radical and the superoxide free radical with very active oxidability are generated by reaction, and the organic and inorganic matters in the waste gas are reduced into carbon dioxide (CO) under the action of photocatalytic oxidation2) Water (H)2O) and other non-toxic and harmless substances, and plays a role in purifying waste gas.
In the natural cooling process in the step c), when the temperature in the activation furnace is reduced to be less than or equal to 70 ℃, the photocatalytic unit is closed, and when the temperature in the activation furnace is reduced to room temperature, the circulating fan, the induced draft fan and the spray pump are closed, so that the activation is finished.
The invention also provides a control method of the saturated activated carbon activation regeneration treatment process, which comprises the following steps:
1) the temperature in the furnace is collected through a sensor, the running state of the equipment is displayed on a touch screen in real time through TCP/IP communication, the monitoring function of the equipment is realized, and the temperature, the concentration and the time in the running process are controlled and adjusted through a PLC;
2) a user can set the temperature in the furnace, the heat preservation time, the temperature equipment of the induced draft fan and the like in a parameter setting area according to requirements;
3) the heat preservation time and the temperature in the furnace are observed through a main interface of the system, and the working states of the ultraviolet lamp, the induced draft fan, the air blower and the circulating pump are displayed in a system state area.
The toluene concentration in the flue gas at the exhaust port was measured under different conditions of the exhaust gas flow rate and desorption temperature, and the obtained results are shown in fig. 1 and 2, and when the exhaust gas flow rate was 0.8m/s and the desorption temperature was 120 ℃, the desorption effect and the exhaust gas treatment effect were the best.
The results of the inspection of the unused, used and regenerated activated carbon of the new carbon and the detection of the iodine adsorption value and ash content are shown in table 1:
| detecting items | The new carbon is not used | Used activated carbon | Regenerated activated carbon | Recovery rate of iodine value |
| Iodine adsorption value mg/g | 642 | 402 | 584 | 91.0 |
Iodine value recovery rate is 100% of regenerated activated carbon/fresh carbon
The results of the inspection of the unused fresh charcoal, the used activated charcoal and the regenerated activated charcoal, and the ash content of the carbon are shown in table 2:
| detecting items | The new carbon is not used | Used activated carbon | Regenerated activated carbon | Percent ashing rate% |
| Ash content% | 36.31 | 42.57 | 39.93 | 9.97 |
Ashing rate (activated carbon after regeneration-fresh carbon unused)/fresh carbon unused 100%
From the above, the activated carbon regenerated by the method has high recovery rate of iodine value and less loss of the activated carbon.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A saturated activated carbon activation regeneration treatment process is characterized in that: the treatment process comprises the following steps:
1) filling saturated activated carbon into an activation furnace, closing a furnace door, starting a saturated activated carbon activation regeneration system, and heating and desorbing the activated carbon by adopting a hot air circulation desorption regeneration process;
2) waste gas generated after the activated carbon desorption is collected by a collecting system and is discharged after being sequentially treated by a condensation precipitation liquid collecting process, an absorption liquid absorbing process and a photocatalytic degradation process;
wherein, the hot air circulation desorption regeneration process comprises the following steps:
a) the activation furnace starts to heat and the circulating fan starts to work at the same time;
b) when the temperature of the activation furnace continuously rises to 70 ℃, the induced draft fan starts to work, and when the temperature of the activation furnace continuously rises to 110 ℃, the constant temperature desorption stage is reached;
c) and (3) keeping the temperature in the furnace to be about 110 ℃ and working at the constant temperature for four hours, ending the constant-temperature desorption stage, stopping heating the activation furnace, naturally cooling to room temperature, and then closing all equipment to finish activation.
2. The activation regeneration treatment process of saturated activated carbon according to claim 1, characterized in that: the condensing and precipitating liquid collecting process comprises the following steps:
1) the waste gas is filtered while being conveyed and condensed, so that partial impurities can be filtered while partial waste gas is condensed;
2) and continuously conveying the waste gas with part of impurities filtered to an absorption liquid absorption process.
3. The activation regeneration treatment process of saturated activated carbon according to claim 2, characterized in that: the absorption liquid absorption process comprises the following steps:
1) the waste gas after partial impurities are filtered enters absorption liquid for absorption, and the absorption liquid is sprayed in a mist shape under the action of a spraying system, so that the waste gas overflowing from the absorption liquid is sprayed and absorbed again, and the absorption efficiency is improved;
2) and the absorbed waste gas is continuously conveyed to a photocatalytic degradation process.
4. The activated regeneration treatment process of saturated activated carbon according to claim 3, characterized in that: the photocatalytic degradation process is to irradiate the nano TiO with ultraviolet light2On catalyst, nanoTiO2The catalyst absorbs light energy to generate electron leap-in and hole leap-in, and generates electron-hole pairs through further combination, the electron-hole pairs react with moisture and oxygen adsorbed on the surface of the waste gas to generate hydroxyl free radicals and superoxide ion free radicals with high oxidability and active waves, organic matters and inorganic matters in the waste gas are reduced into carbon dioxide, water and other nontoxic and harmless substances under the action of photocatalytic oxidation, and the effect of purifying the waste gas is achieved.
5. The activated regeneration treatment process of saturated activated carbon according to claim 4, characterized in that: the absorption liquid comprises, by weight, 80-90 parts of water, 2-3 parts of potassium carbonate, 1-1.5 parts of sodium humate, 0.7-1 part of acetic acid, 1-2 parts of a defoaming agent, a quaternary ammonium salt cationic surfactant and 3-3.5 parts of polyethylene glycol.
6. The activated regeneration treatment process of saturated activated carbon according to claim 5, characterized in that: the absorption liquid is contained in the absorption container paved with the filler, so that the absorption efficiency of the absorption liquid is improved.
7. The activated regeneration treatment process of saturated activated carbon according to claim 6, characterized in that: the waste gas and the absorption liquid move reversely.
8. The activated regeneration treatment process of saturated activated carbon according to claim 7, characterized in that: and the waste gas is absorbed and sprayed by the absorption liquid, and then subjected to demisting treatment and photocatalytic degradation.
9. The activation regeneration treatment process of saturated activated carbon according to claim 1, characterized in that: in the natural cooling process in the step c), when the temperature in the activation furnace is reduced to be less than or equal to 70 ℃, the photocatalytic unit is closed, and when the temperature in the activation furnace is reduced to room temperature, the circulating fan, the induced draft fan and the spray pump are closed, so that the activation is finished.
10. A method for controlling a saturated activated carbon activation regeneration treatment process according to any one of claims 1 to 9, characterized by comprising the steps of:
1) the temperature in the furnace is collected through a sensor, the running state of the equipment is displayed on a touch screen in real time through TCP/IP communication, the monitoring function of the equipment is realized, and the temperature, the concentration and the time in the running process are controlled and adjusted through a PLC;
2) a user sets the temperature in the furnace, the heat preservation time and the temperature of a draught fan in a parameter setting area according to requirements;
3) the heat preservation time and the temperature in the furnace are observed through a main interface of the system, and the working states of the ultraviolet lamp, the induced draft fan, the air blower and the circulating pump are displayed in a system state area.
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