CN111013318A - VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon - Google Patents
VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon Download PDFInfo
- Publication number
- CN111013318A CN111013318A CN201911297187.5A CN201911297187A CN111013318A CN 111013318 A CN111013318 A CN 111013318A CN 201911297187 A CN201911297187 A CN 201911297187A CN 111013318 A CN111013318 A CN 111013318A
- Authority
- CN
- China
- Prior art keywords
- valve
- adsorption
- adsorption bed
- condensation
- desorption
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0438—Cooling or heating systems
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a VOC normal temperature condensation treatment system and method utilizing static activity of activated carbon, and relates to the technical field of treatment of industrial discharged VOCs, wherein the system comprises a VOCs pretreatment system, a desorption condensation system, an auxiliary adsorption bed C, an adsorption bed A and an adsorption bed B; the adsorption beds A and B are connected with an adsorption fan through an adsorption air inlet valve; the adsorption fan is connected with a VOCs pretreatment system; the adsorption beds A and B are connected with the atmosphere through an adsorption gas outlet valve; the adsorption beds A and B are connected in series in a closed way through series valves Ab and Ba; the two ends of the adsorption bed A, the adsorption bed B and the auxiliary adsorption bed C are respectively connected with the two ends of the desorption condensation system through desorption condensation valves. The treatment method of the system fully utilizes the static activity of the active carbon, reduces the cost of the active carbon, prolongs the service life, and has higher purity of the recovered organic solvent and high recovery efficiency; and a 2+1 mode is adopted, so that the control strategy is simpler and the operation is more reliable.
Description
Technical Field
The invention relates to the technical field of treatment of industrial discharged VOCs, in particular to a VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon.
Background
Volatile Organic Compounds (VOCs) in the atmosphere cause serious damage to plant and animal life and affect human health such as eye irritation, respiratory problems, cancer induction, and the like. VOCs used as organic solvents in industries such as spray coating, furniture, etc. may account for 35-40% of atmospheric VOCs emissions. Common treatment means for VOCs in the above industry include: adsorption, absorption, condensation and other recovery methods and direct combustion, catalytic oxidation, biological treatment, low-temperature plasma, photocatalysis and other destruction methods; in practice, two or three of the above methods are generally combined. The VOCs treatment method combining activated carbon adsorption concentration and condensation recovery is more convenient and simpler in subsequent treatment and high in economic benefit, and is an ideal treatment method.
Lufukun et al propose a process for activated carbon adsorption and N2 desorption recovery treatment of organic waste gas, after adsorption, N2 vacuum 4-10 KPa circulation heating desorption is adopted, then condensation is carried out by a double-stage condensation device, and residual VOCs are blown by fresh air and then sent to another adsorber for adsorption. This patent can effectively desorb out the VOCs gas and the condensation, but adopts fresh air to sweep still to face safe risk and influence active carbon life of application at last. Yani et al propose a hot nitrogen gas desorption condensation recovery system of active carbon adsorption, adopt tertiary condensation behind the desorption gas, the noncondensable gas in the pipeline gets into supplementary active carbon adsorber absorption after the desorption, this patent still has the problem that tertiary condensation energy consumption is high, equipment thermal stress and gas tightness require highly.
The inventor also provides a system and a method for treating VOCs through normal-temperature condensation-assisted purification, wherein three same beds are used for alternate adsorption purification, desorption condensation and assisted purification, so that the residual quantity of a bed body after desorption condensation is very small to ensure that the concentration of discharged VOCs in a normal adsorption period reaches the standard. This patent has realized that the adsorption efficiency of normal atmospheric temperature condensation assurance simultaneously is up to standard, has reduced the technology degree of difficulty, equipment cost and operation energy consumption, but this patent is the same with other similar patents and has only utilized the activity that moves of active carbon to it is higher to active carbon adsorption desorption performance requirement, and the adsorption capacity is greater than condensation residual and dynamic adsorption capacity sum when requiring supplementary absorption, otherwise can appear shifting not enough to lead to adsorbing the drawback that purifies the back emission concentration not up to standard.
At present, the adsorption, concentration and condensation recovery method of VOCs generally faces the following four problems: deep condensation is needed, so that the energy consumption for condensation and heating is greatly improved; stress loss caused by large temperature difference borne by system equipment, pipelines and valves and gas tightness are difficult to meet; a part of VOCs still remaining in the adsorption bed after condensation causes the reduction of the adsorption efficiency of the next stage or faces the explosion risk by adopting fresh air hot purging; only the adsorption dynamic activity of the activated carbon is utilized, and the adsorption capacity of part of the activated carbon is wasted.
Disclosure of Invention
The invention aims to provide a VOC normal-temperature condensation treatment system and method utilizing the static activity of activated carbon, which are used for solving the problems in the prior art, fully utilizing the adsorption capacity of the activated carbon, saving the use of the activated carbon, realizing the liquefaction recovery of VOCs by utilizing a conventional high-efficiency cold source and even a natural cold source, and greatly reducing the condensation energy consumption and equipment cost.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a VOC normal temperature condensation treatment system utilizing the static activity of active carbon, which comprises a VOCs pretreatment system, a desorption condensation system and an auxiliary adsorption bed C, wherein one side of the auxiliary adsorption bed C is provided with two adsorption beds A and B which are connected in parallel; the adsorption bed A is connected with an adsorption fan through an adsorption air inlet valve Aa1, and the adsorption bed B is connected with the adsorption fan through an adsorption air inlet valve Ba 1; the adsorption fan is connected with the VOCs pretreatment system; the adsorption bed A is connected with the atmosphere through an adsorption gas outlet valve Aa2, and the adsorption bed B is connected with the atmosphere through an adsorption gas outlet valve Ba 2; the adsorption bed A and the adsorption bed B are in serial closed connection through a serial valve Ab and a serial valve Ba; the two ends of the adsorption bed A are respectively connected with the two ends of the desorption condensation system through a desorption condensation valve Ad1 and a desorption condensation valve Ad2, the two ends of the adsorption bed B are respectively connected with the two ends of the desorption condensation system through a desorption condensation valve Bd1 and a desorption condensation valve Bd2, and the two ends of the adsorption bed C are respectively connected with the two ends of the desorption condensation system through a desorption condensation valve Cd1 and a desorption condensation valve Cd 2.
Optionally, the desorption condensation system comprises a gas-gas heat exchanger, a normal temperature condensation system, a three-way butterfly valve, a desorption fan, a stop valve and a heater which are connected in series in sequence; the three-way butterfly valve comprises a passage I, a passage II and a passage III, the normal temperature condensing system is connected with the passage I, the desorption fan is connected with the passage II, a connecting pipeline between the passage II and the desorption fan is connected with a first branch connected with the gas-gas heat exchanger, and the passage III is connected with the gas-gas heat exchanger through a second branch; the auxiliary adsorption bed C is connected to both ends of the cutoff valve through a valve Cp1 and a valve Cp 2; desorption condensation valve Ad1, desorption condensation valve Bd1 and desorption condensation valve Cd1 through first desorption condensation pipeline with heater connection, desorption condensation valve Ad2, desorption condensation valve Bd2 and desorption condensation valve Cd2 through second desorption condensation pipeline with the gas heat exchanger is connected.
Optionally, the system further comprises a nitrogen supplementing system, wherein the nitrogen supplementing system comprises a nitrogen source and an online oxygen content detector, the nitrogen source is connected with the second desorption condensation pipeline through a nitrogen supplementing valve n1, the first desorption condensation pipeline is connected with a nitrogen supplementing valve n2, and the nitrogen supplementing valve n2 is connected with the adsorption pipeline at the front end of the VOCs pretreatment system through the online oxygen content detector.
Optionally, a VOCs concentration sensor Av is arranged between the adsorption bed a and the adsorption gas outlet valve Aa2, a VOCs concentration sensor Bv is arranged between the adsorption bed B and the adsorption gas outlet valve Ba2, a VOCs concentration sensor Cv is arranged between the gas-gas heat exchanger and the normal temperature condensing system, and a VOCs concentration sensor Dv is arranged between one end of the stop valve and the valve Cp 2.
Optionally, the normal temperature condensing system includes VOCs liquid storage pot and normal temperature condenser, normal temperature condenser can adopt conventional high-efficient cold source or natural cold source.
Optionally, the adsorption fan and the desorption fan are explosion-proof variable frequency fans.
The invention also provides a treatment method of the VOC normal-temperature condensation treatment system utilizing the static activity of the activated carbon, which comprises the following steps:
step 20, opening an adsorption air inlet valve Aa1 and an adsorption air outlet valve Aa2, cooling the organic waste gas by a pretreatment system, removing particles, sending the organic waste gas into an adsorption bed A, purifying the organic waste gas to reach the standard, and discharging the organic waste gas into the atmosphere;
step 30, when the display value of the VOCs concentration sensor Av behind the adsorption bed A reaches 50% of the emission standard, closing an adsorption gas outlet valve Aa2, opening a series valve Ab, connecting the adsorption bed B behind the adsorption bed A in series, and discharging the waste gas into the atmosphere after passing through the adsorption bed A and the adsorption bed B in sequence until the VOCs concentration sensor Av displays that the adsorption bed A reaches the saturated adsorption amount and cannot continue to adsorb, and then, entering a desorption stage by the adsorption bed A and continuing to adsorb by the adsorption bed B;
step 40, before desorption of the adsorption bed A, opening a nitrogen supplement valve n1, a nitrogen supplement valve n2 and a nitrogen source, replacing the gas in the adsorption bed A with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valves n1 and n2 and the nitrogen source when the online oxygen content detector shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Ad1, a desorption condensation valve Ad2, a stop valve, a desorption fan and a heater in sequence, switching a three-way butterfly valve to a passage I and a passage III, and opening a condensation system when the display value of a VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
step 50, closing the stop valve, opening a valve Cp1 and a valve Cp2, switching the three-way butterfly valve to a passage I and a passage II, cooling high-temperature and high-concentration VOCs gas discharged from the adsorption bed A, sending the cooled high-temperature and high-concentration VOCs gas into the adsorption bed C, adsorbing the low-concentration VOCs gas, changing the low-concentration VOCs gas into low-concentration gas, reheating the low-concentration gas, continuously desorbing VOCs in the adsorption bed A until a VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed A, then opening the stop valve, closing the valve Cp1, the valve Cp2 and a heater, and cooling down activated carbon in the adsorption bed;
step 60, when the value displayed by the concentration sensor Bv of the VOCs behind the adsorption bed B reaches 50% of the emission standard, closing the adsorption gas outlet valve Ba2, opening the serial valve Ba, connecting the adsorption bed A behind the adsorption bed B in series, and discharging the waste gas into the atmosphere after passing through the adsorption bed B and the adsorption bed A in sequence until the concentration sensor Bv of the VOCs shows that the adsorption bed B reaches the saturated adsorption capacity and cannot continue to adsorb, and then, entering the desorption stage by the adsorption bed B, and continuing to adsorb by the adsorption bed A;
step 70, before desorption of the adsorption bed B, opening a nitrogen supplement valve n1, a nitrogen supplement valve n2 and a nitrogen source, replacing the gas in the adsorption bed B with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valve n1, the nitrogen supplement valve n2 and the nitrogen source when the online oxygen content detector shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Bd1, a desorption condensation valve Bd2, a stop valve, a desorption fan and a heater in sequence, switching a three-way butterfly valve to a passage I and a passage III, and opening a condensation system when the display value of the VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
step 80, closing the stop valve, opening a valve Cp1 and a valve Cp2, switching the three-way butterfly valve to the positions of the passage I and the passage II, cooling the high-temperature and high-concentration VOCs gas coming out of the adsorption bed B, sending the cooled high-temperature and high-concentration VOCs gas into the adsorption bed C to be adsorbed into low-concentration gas, reheating the low-concentration gas, continuously desorbing the VOCs in the adsorption bed B until a VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed B, then opening the stop valve, closing the valve Cp1, the valve Cp2 and the heater, and cooling the activated carbon in the adsorption bed B;
step 90, repeating the steps 30-80;
step 100, when a concentration sensor Dv of VOCs behind the auxiliary adsorption bed C displays that the adsorption bed C reaches a set transfer limit, a desorption condensation valve Cd1, a desorption condensation valve Cd2 and a stop valve are opened, a three-way butterfly valve is switched to a passage I and a passage III, a desorption fan and a heater are opened, when a display value of the concentration sensor Cv of VOCs reaches a condensation concentration, a condensation system is opened until no condensate flows out, the heater is closed, and the activated carbon in the adsorption bed C is cooled down.
Compared with the prior art, the invention has the following technical effects:
the invention provides a VOCs normal temperature condensation processing system and method using active carbon static activity, according to the breakthrough curve characteristic of active carbon to VOCs and the combination of the active carbon adsorption isotherm characteristic, adopting 2+1 mode operation, wherein '2' represents the same two beds (A \ B) alternate adsorption and is responsible for directly processing discharged waste gas, and the operation working conditions comprise single bed adsorption, front series adsorption, desorption condensation, purification transfer and back series adsorption; wherein "1" represents auxiliary bed (C), the filling active carbon amount of C bed is generally greater than A \ B bed and C bed is not responsible for waste gas adsorption and purification, its operating condition includes: auxiliary adsorption and desorption condensation. Through utilizing the static activity of the active carbon and adopting the normal temperature condensation combined with the auxiliary adsorption bed with strict matching for auxiliary purification, the cost and the system energy consumption are reduced, and the VOCs solvent is efficiently recovered. According to the characteristic of the breakthrough curve of the activated carbon to the VOCs, when the adsorption bed is about to break through and the series working condition is switched, the activated carbon of the adsorption bed is completely adsorbed and saturated, so that the cost of the activated carbon and the volume of the adsorption bed can be greatly reduced when the activated carbon adsorption bed is designed. And the normal temperature condensation is adopted, so that the deep condensation is avoided, the energy consumption and the process difficulty are reduced, the temperature difference of fluid in the system is reduced, and the thermal stress requirement of equipment and pipelines is reduced, so that the whole scheme is economical and feasible. Strictly match the active carbon quantity of supplementary adsorption bed, make supplementary adsorption bed can adsorb completely and come from remaining VOCs in condensation back adsorption bed A or the B, make the adsorption efficiency of adsorption bed A, B next cycle still can maintain higher level, but further desorption and the VOCs condensation recovery that comes out with desorption after supplementary adsorption bed adsorption finishes moreover, thereby it is higher to maintain higher VOCs rate of recovery and the VOCs concentration after supplementary bed desorption, also make condensation efficiency higher, the condensation energy consumption is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of an atmospheric-temperature condensation treatment system for VOCs using activated carbon deactivation according to the present invention;
wherein, 1 is VOCs pretreatment systems, 2 is adsorption fans, 3 is nitrogen source, 4 is online oxygen content detector, 5 is gas-gas heat exchanger, 6 is normal temperature condensing system, 7 is three-way butterfly valve, 8 is desorption fans, 9 is heater, 10 is stop valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a VOC normal-temperature condensation treatment system and method utilizing the static activity of activated carbon, which are used for solving the problems in the prior art, fully utilizing the adsorption capacity of the activated carbon, saving the use of the activated carbon, realizing the liquefaction recovery of VOCs by utilizing a conventional high-efficiency cold source and even a natural cold source, and greatly reducing the condensation energy consumption and equipment cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a VOCs normal temperature condensation processing system and method using active carbon static activity, as shown in figure 1, the system includes: two parallel adsorption beds A and B, an auxiliary adsorption bed C, VOCs pretreatment system 1, a nitrogen supplement system and a desorption condensation system. The adsorption bed A and the adsorption bed B are connected with the VOCs pretreatment system 1 and the adsorption fan 2 through an adsorption air inlet valve Aa1 and an adsorption air inlet valve Ba1, connected with the atmosphere through an adsorption air outlet valve Aa2 and an adsorption air outlet valve Ba2, and connected with each other through a series valve Ab and a series valve Ba; the adsorption bed A, the adsorption bed B and the auxiliary adsorption bed C are connected with a desorption condensation system through a desorption condensation valve Ad1, a desorption condensation valve Ad2, a desorption condensation valve Bd1, a desorption condensation valve Bd2, a desorption condensation valve Cd1 and a desorption condensation valve Cd2, and the desorption condensation system comprises a gas-gas heat exchanger 5, a normal temperature condensation system 6, a three-way butterfly valve 7, a desorption fan 8, a heater 9 and a stop valve 10; the nitrogen supplementing system is connected with a desorption condensation pipeline through a nitrogen supplementing valve n1 and a nitrogen supplementing valve n2, the other side of the nitrogen supplementing valve n2 is connected with an adsorption pipeline at the front end of the VOCs pretreatment system 1, and the nitrogen supplementing system comprises a nitrogen source 3 and an online oxygen content detector 4; the auxiliary adsorbent bed C is also connected to both sides of the cut-off valve 10 via valves Cp1 and Cp 2.
The processing method comprises the following steps:
Step 20, synchronously opening the adsorption fan 2, opening an adsorption air inlet valve Aa1 and an adsorption air outlet valve Aa2 along with the production line, cooling the organic waste gas by a pretreatment system, removing particles, then sending the organic waste gas into an adsorption bed A, purifying the organic waste gas to reach the standard, and then discharging the organic waste gas into the atmosphere;
step 30, when the display value of the VOCs concentration sensor Av behind the adsorption bed A reaches 50% of the emission standard, closing the adsorption valve Aa2, opening the series valve Ab, improving the frequency of the adsorption fan 2 to keep the adsorption air volume unchanged, connecting the adsorption bed B behind the adsorption bed A in series, sequentially passing the waste gas through the adsorption bed A and the adsorption bed B, then discharging the waste gas into the atmosphere until the VOCs concentration sensor Av shows that the adsorption bed A reaches the saturated adsorption volume and cannot continue to adsorb, then, entering a desorption stage by the adsorption bed A, reducing the frequency of the adsorption fan 2 to keep the adsorption air volume unchanged, and continuing to adsorb by the adsorption bed B;
step 40, before desorption of the adsorption bed A, opening a nitrogen supplement valve n1, a nitrogen supplement valve n2 and a nitrogen source 3, replacing the gas in the adsorption bed A with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valve n1, the nitrogen supplement valve n2 and the nitrogen source 3 when the online oxygen content detector 4 shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Ad1, a desorption condensation valve Ad2, a stop valve, a desorption fan and a heater in sequence, switching a three-way butterfly valve to a passage I and a passage III, and opening a condensation system when the display value of a VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
step 50, no VOCs is desorbed from the adsorption bed A at the moment, but the condensation residual quantity of the VOCs in the adsorption bed A at the moment influences the adsorption efficiency of the next period, so that the residual VOCs in the adsorption bed A needs to be transferred into the auxiliary adsorption bed C; closing the stop valve 10, opening the valve Cp1 and the valve Cp2, switching the three-way butterfly valve 7 to the passage I and the passage II, increasing the frequency of the desorption fan 8 to keep the desorption air volume unchanged, cooling the high-temperature and high-concentration VOCs gas coming out of the adsorption bed a, sending the cooled high-temperature and high-concentration VOCs gas into the adsorption bed C, adsorbing the low-concentration VOCs gas, and then reheating the low-concentration VOCs gas, continuously desorbing the VOCs in the adsorption bed a until the VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed a, then opening the stop valve 10, closing the valve Cp1, the valve Cp2 and the heater, cooling down the activated carbon in the adsorption bed a, and then sequentially closing the desorption fan 2, the condensing system 6, the desorption condensation valve Ad1, the desorption condensation valve Ad2 and the stop valve 10;
step 60, when the value displayed by the concentration sensor Bv of the VOCs behind the adsorption bed B reaches 50% of the emission standard, closing the adsorption valve Ba2, opening the series valve Ba, improving the frequency of the adsorption fan 2 to keep the adsorption air volume unchanged, connecting the adsorption bed A behind the adsorption bed B in series, discharging the waste gas into the atmosphere through the adsorption beds B and A in sequence until the concentration sensor Bv of the VOCs shows that the adsorption bed B reaches the saturated adsorption volume and cannot continue to adsorb, then, entering the desorption stage by the adsorption bed B, reducing the frequency of the adsorption fan 2 to keep the adsorption air volume unchanged, and continuing to adsorb by the adsorption bed A;
step 70, before desorption of the adsorption bed B, opening a nitrogen supplement valve n1, a nitrogen supplement valve n2 and a nitrogen source 3, replacing the gas in the adsorption bed B with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valve n1, the nitrogen supplement valve n2 and the nitrogen source 3 when the online oxygen content detector 4 shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Bd1, a desorption condensation valve Bd2, a stop valve 10, a desorption fan 8 and a heater 9 in sequence, switching a three-way butterfly valve 7 to a passage I and a passage III, desorbing VOCs in the adsorption bed B by high-temperature nitrogen at the moment, and opening a condensation system 6 when the display value of a VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
80, desorbing no VOCs in the adsorption bed B at the moment, wherein the residual VOCs in the adsorption bed B after condensation influences the adsorption efficiency of the next period, so that the residual VOCs in the adsorption bed B needs to be transferred into the auxiliary adsorption bed C; closing the stop valve 10, opening a valve Cp1\ Cp2, switching the three-way butterfly valve 7 to the positions of the passage I and the passage II, increasing the frequency of the desorption fan 8 to keep the desorption air volume unchanged, cooling the high-temperature high-concentration VOCs gas coming out of the adsorption bed B, sending the cooled high-temperature high-concentration VOCs gas into the adsorption bed C to be adsorbed into low-concentration gas, heating the low-concentration gas, continuously desorbing VOCs in the adsorption bed B until the VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed B, then opening the stop valve 10, closing the valve Cp1\ Cp2 and the heater to cool down the activated carbon in the adsorption bed B, and then closing the desorption fan 2, the condensing system 6, the desorption condensation valve Bd1, the desorption condensation valve Bd2 and the stop valve 10 in sequence;
step 90, repeating the above steps 30-80
Step 100, when the concentration sensor Dv of the VOCs behind the auxiliary adsorption bed C shows that the adsorption bed C reaches the transfer limit, opening a desorption condensation valve Cd1, a desorption condensation valve Cd2 and a stop valve 10, switching a three-way butterfly valve to a passage I and a passage III, opening a desorption fan 8 and a heater 9, when the display value of the concentration sensor Dv of the VOCs reaches the condensation concentration, opening a condensation system 6 until no condensate flows out, closing the heater 9, and cooling down the activated carbon in the adsorption bed C.
The saturated adsorption amount qb for a given activated carbon depends on the discharge concentration of VOCs, the exhaust air temperature and the type of VOCs; the condensation concentration Cc depends on the VOCs species and the condensation temperature; the condensation residual quantity qr of the VOCs depends on the desorption temperature and the condensation concentration Cc; the transfer limit qc depends on the condensation temperature and desorption concentration Cd; mc (qc-qr) is not less than Nmqr, and the dosage of the activated carbon can be calculated by taking equal sign when the auxiliary adsorption bed is designed, and 20 percent of margin is reserved, wherein N represents transferable times.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides an utilize active carbon static active VOC normal atmospheric temperature condensation processing system which characterized in that: the device comprises a VOCs pretreatment system, a desorption and condensation system and an auxiliary adsorption bed C, wherein two adsorption beds A and B which are connected in parallel are arranged on one side of the auxiliary adsorption bed C; the adsorption bed A is connected with an adsorption fan through an adsorption air inlet valve Aa1, and the adsorption bed B is connected with the adsorption fan through an adsorption air inlet valve Ba 1; the adsorption fan is connected with the VOCs pretreatment system; the adsorption bed A is connected with the atmosphere through an adsorption gas outlet valve Aa2, and the adsorption bed B is connected with the atmosphere through an adsorption gas outlet valve Ba 2; the adsorption bed A and the adsorption bed B are in serial closed connection through a serial valve Ab and a serial valve Ba; two ends of the adsorption bed A are respectively connected with two ends of a desorption condensation system through a desorption condensation valve Ad1 and a desorption condensation valve Ad2, two ends of the adsorption bed B are respectively connected with two ends of the desorption condensation system through a desorption condensation valve Bd1 and a desorption condensation valve Bd2, and two ends of the adsorption bed C are respectively connected with two ends of the desorption condensation system through a desorption condensation valve Cd1 and a desorption condensation valve Cd 2; the active carbon dosage of the adsorption bed A, B is the same, and the active dosage m of the auxiliary adsorption bed C is the samecThe dosage m of the active carbon, the performance of the active carbon and the operating condition parameters of the adsorption bed A and the adsorption bed B are matched.
2. The adsorbent bed of claim 1, wherein: the operation conditions of the adsorption bed A and the adsorption bed B comprise single-bed adsorption, front series adsorption, desorption condensation, purification transfer and rear series adsorption, and the operation condition of the auxiliary adsorption bed C comprises auxiliary adsorption and desorption condensation.
3. The VOC ambient condensation processing system using active carbon static activity according to claim 1, characterized in that: the desorption and condensation system comprises a gas-gas heat exchanger, a normal temperature condensation system, a three-way butterfly valve, a desorption fan, a stop valve and a heater which are sequentially connected in series; the three-way butterfly valve comprises a passage I, a passage II and a passage III, the normal temperature condensing system is connected with the passage I, the desorption fan is connected with the passage II, a connecting pipeline between the passage II and the desorption fan is connected with a first branch connected with the gas-gas heat exchanger, and the passage III is connected with the gas-gas heat exchanger through a second branch; the auxiliary adsorption bed C is connected to both ends of the cutoff valve through a valve Cp1 and a valve Cp 2; desorption condensation valve Ad1, desorption condensation valve Bd1 and desorption condensation valve Cd1 through first desorption condensation pipeline with heater connection, desorption condensation valve Ad2, desorption condensation valve Bd2 and desorption condensation valve Cd2 through second desorption condensation pipeline with the gas heat exchanger is connected.
4. The VOC ambient condensation processing system using active carbon static activity according to claim 2, characterized in that: the system is characterized by further comprising a nitrogen supplementing system, wherein the nitrogen supplementing system comprises a nitrogen source and an online oxygen content detector, the nitrogen source is connected with a second desorption condensation pipeline through a nitrogen supplementing valve n1, the first desorption condensation pipeline is connected with a nitrogen supplementing valve n2, and the nitrogen supplementing valve n2 is connected with an adsorption pipeline at the front end of the VOCs pretreatment system through the online oxygen content detector.
5. The VOC ambient temperature condensation treatment system using the static activity of the activated carbon as claimed in claim 3, wherein: the adsorption bed A with be provided with VOCs concentration sensor Av between the valve of gas a2 out of adsorbing, adsorption bed B with be provided with VOCs concentration sensor Bv between the valve of gas a2 out of adsorbing, the gas heat exchanger with be provided with VOCs concentration sensor Cv between the normal atmospheric temperature condensing system, stop valve one end with be provided with VOCs concentration sensor Dv between the valve Cp 2.
6. The VOC ambient condensation processing system using active carbon static activity according to claim 1, characterized in that: the normal temperature condensing system comprises a VOCs liquid storage tank and a normal temperature condenser, wherein the normal temperature condenser can adopt a conventional high-efficiency cold source or a natural cold source.
7. The VOC ambient condensation processing system using active carbon static activity according to claim 1, characterized in that: the adsorption fan and the desorption fan are explosion-proof variable frequency fans, and the desorption fan is of a sealing structure.
8. A VOC normal temperature condensation treatment method utilizing active carbon static activity is characterized in that: the method comprises the following steps:
step 10, debugging equipment, closing all adsorption air inlet valves Aa1 and Ba1 and all adsorption air outlet valves Aa2 and Ba2, opening all the rest valves, then opening a nitrogen source, replacing the gas in a system pipeline and the equipment with nitrogen, and closing all the valves and the nitrogen source when an online oxygen content detector shows that the oxygen content is lower than 5%;
step 20, opening an adsorption air inlet valve Aa1 and an adsorption air outlet valve Aa2, cooling the organic waste gas by a pretreatment system, removing particles, sending the organic waste gas into an adsorption bed A, purifying the organic waste gas to reach the standard, and discharging the organic waste gas into the atmosphere;
step 30, when the display value of the VOCs concentration sensor Av behind the adsorption bed A reaches 50% of the emission standard, closing an adsorption gas outlet valve Aa2, opening a series valve Ab, connecting the adsorption bed B behind the adsorption bed A in series, and discharging the waste gas into the atmosphere after passing through the adsorption bed A and the adsorption bed B in sequence until the VOCs concentration sensor Av displays that the adsorption bed A reaches the saturated adsorption amount and cannot continue to adsorb, and then, entering a desorption stage by the adsorption bed A and continuing to adsorb by the adsorption bed B;
step 40, before desorption of the adsorption bed A, opening nitrogen supplement valves n1, n2 and a nitrogen source, replacing the gas in the adsorption bed A with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valves n1, n2 and the nitrogen source when the online oxygen content detector shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Ad1, a desorption condensation valve Ad2, a stop valve, a desorption fan and a heater in sequence, switching a three-way butterfly valve to a passage I and a passage III, and opening a condensation system when the display value of a VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
step 50, closing the stop valve, opening a valve Cp1 and a valve Cp2, switching the three-way butterfly valve to a passage I and a passage II, cooling high-temperature and high-concentration VOCs gas discharged from the adsorption bed A, sending the cooled high-temperature and high-concentration VOCs gas into the adsorption bed C, adsorbing the low-concentration VOCs gas, changing the low-concentration VOCs gas into low-concentration gas, reheating the low-concentration gas, continuously desorbing VOCs in the adsorption bed A until a VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed A, then opening the stop valve, closing the valve Cp1, the valve Cp2 and a heater, and cooling down activated carbon in the adsorption bed;
step 60, when the value displayed by the concentration sensor Bv of the VOCs behind the adsorption bed B reaches 50% of the emission standard, closing the adsorption gas outlet valve Ba2, opening the serial valve Ba, connecting the adsorption bed A behind the adsorption bed B in series, and discharging the waste gas into the atmosphere after passing through the adsorption bed B and the adsorption bed A in sequence until the concentration sensor Bv of the VOCs shows that the adsorption bed B reaches the saturated adsorption capacity and cannot continue to adsorb, and then, entering the desorption stage by the adsorption bed B, and continuing to adsorb by the adsorption bed A;
step 70, before desorption of the adsorption bed B, opening a nitrogen supplement valve n1, a nitrogen supplement valve n2 and a nitrogen source, replacing the gas in the adsorption bed B with nitrogen and sending the nitrogen into an adsorption pipeline, and closing the nitrogen supplement valve n1, the nitrogen supplement valve n2 and the nitrogen source when the online oxygen content detector shows that the oxygen content is lower than 5%; then opening a desorption condensation valve Bd1, a desorption condensation valve Bd2, a stop valve, a desorption fan and a heater in sequence, switching a three-way butterfly valve to a passage I and a passage III, and opening a condensation system when the display value of the VOCs concentration sensor Cv reaches the condensation concentration until no condensate flows out;
step 80, closing the stop valve, opening a valve Cp1 and a valve Cp2, switching the three-way butterfly valve to the positions of the passage I and the passage II, cooling the high-temperature and high-concentration VOCs gas coming out of the adsorption bed B, sending the cooled high-temperature and high-concentration VOCs gas into the adsorption bed C to be adsorbed into low-concentration gas, reheating the low-concentration gas, continuously desorbing the VOCs in the adsorption bed B until a VOCs concentration sensor Cv shows that no VOCs are desorbed in the adsorption bed B, then opening the stop valve, closing the valve Cp1, the valve Cp2 and the heater, and cooling the activated carbon in the adsorption bed B;
step 90, repeating the steps 30-80;
step 100, when a concentration sensor Dv of VOCs behind the auxiliary adsorption bed C displays that the adsorption bed C reaches a set transfer limit, a desorption condensation valve Cd1, a desorption condensation valve Cd2 and a stop valve are opened, a three-way butterfly valve is switched to a passage I and a passage III, a desorption fan and a heater are opened, when a display value of the concentration sensor Cv of VOCs reaches a condensation concentration, a condensation system is opened until no condensate flows out, the heater is closed, and the activated carbon in the adsorption bed C is cooled down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911297187.5A CN111013318A (en) | 2019-12-16 | 2019-12-16 | VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911297187.5A CN111013318A (en) | 2019-12-16 | 2019-12-16 | VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111013318A true CN111013318A (en) | 2020-04-17 |
Family
ID=70209637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911297187.5A Pending CN111013318A (en) | 2019-12-16 | 2019-12-16 | VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111013318A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495155A (en) * | 2021-02-07 | 2021-03-16 | 瑞燃(上海)环境工程技术有限公司 | Process system for treating toxic and harmful tail gas by dry chemical filtering device |
| CN112933868A (en) * | 2021-02-26 | 2021-06-11 | 苏州东净环境科技有限公司 | Paint mist waste gas treatment and solvent recovery system and control method |
| CN113019083A (en) * | 2021-03-01 | 2021-06-25 | 太原理工大学 | VOCs low-temperature plasma synergistic adsorption and catalysis integrated device and VOCs treatment method thereof |
| CN113274840A (en) * | 2021-05-18 | 2021-08-20 | 浙江菲达环保科技股份有限公司 | Device and method for treating VOCs waste gas through activated carbon adsorption high-temperature desorption-catalytic oxidation |
| CN114471077A (en) * | 2022-01-27 | 2022-05-13 | 佛山市科蓝环保科技股份有限公司 | VOCs desorption device and VOCs desorption method of activated carbon assembly |
| CN114558420A (en) * | 2022-03-07 | 2022-05-31 | 班戈设备***（苏州）有限公司 | System and method for recycling VOCs (volatile organic compounds) through normal-temperature condensation |
-
2019
- 2019-12-16 CN CN201911297187.5A patent/CN111013318A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112495155A (en) * | 2021-02-07 | 2021-03-16 | 瑞燃(上海)环境工程技术有限公司 | Process system for treating toxic and harmful tail gas by dry chemical filtering device |
| CN112495155B (en) * | 2021-02-07 | 2021-05-14 | 瑞燃(上海)环境工程技术有限公司 | Process system for treating toxic and harmful tail gas by dry chemical filtering device |
| CN112933868A (en) * | 2021-02-26 | 2021-06-11 | 苏州东净环境科技有限公司 | Paint mist waste gas treatment and solvent recovery system and control method |
| CN113019083A (en) * | 2021-03-01 | 2021-06-25 | 太原理工大学 | VOCs low-temperature plasma synergistic adsorption and catalysis integrated device and VOCs treatment method thereof |
| CN113274840A (en) * | 2021-05-18 | 2021-08-20 | 浙江菲达环保科技股份有限公司 | Device and method for treating VOCs waste gas through activated carbon adsorption high-temperature desorption-catalytic oxidation |
| CN113274840B (en) * | 2021-05-18 | 2024-07-05 | 浙江菲达环保科技股份有限公司 | Device and method for treating VOCs waste gas by activated carbon adsorption high-temperature desorption-catalytic oxidation |
| CN114471077A (en) * | 2022-01-27 | 2022-05-13 | 佛山市科蓝环保科技股份有限公司 | VOCs desorption device and VOCs desorption method of activated carbon assembly |
| CN114558420A (en) * | 2022-03-07 | 2022-05-31 | 班戈设备***（苏州）有限公司 | System and method for recycling VOCs (volatile organic compounds) through normal-temperature condensation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111013318A (en) | VOC normal-temperature condensation treatment system and method utilizing static activity of activated carbon | |
| CN111389175B (en) | Series targeted adsorption and parallel desorption organic waste gas treatment device | |
| CN113274840B (en) | Device and method for treating VOCs waste gas by activated carbon adsorption high-temperature desorption-catalytic oxidation | |
| CN210171129U (en) | VOCs processing system of supplementary purification of normal atmospheric temperature condensation | |
| CN205760441U (en) | A kind of scattered adsorption, the organic exhaust gas purifying system of concentration desorption and regeneration | |
| CN211706335U (en) | VOC normal temperature condensation processing system utilizing active carbon static activity | |
| CN110075658B (en) | VOCs treatment system for normal temperature condensation auxiliary purification and treatment method thereof | |
| CN208340417U (en) | N-butanol exhaust treatment system | |
| CN217662415U (en) | Active carbon adsorption concentration catalytic combustion system | |
| CN207042186U (en) | A kind of organic waste gas treatment system | |
| CN109985485B (en) | Device and method for adsorbing, recovering and purifying high-concentration gas | |
| CN214598091U (en) | Exhaust gas VOCs adsorption tank sweep enrichment facility | |
| CN208032239U (en) | A kind of VOCs high-level cleaners | |
| US7377964B2 (en) | Device for processing discharging exhaust gas | |
| CN209451577U (en) | A kind of device of recyclable absorption carbon dioxide | |
| CN209405975U (en) | Continuous type organic waste gas catalytic purification apparatus | |
| CN208212850U (en) | A kind of enrichment facility of low-concentration organic exhaust gas | |
| CN111135710A (en) | High-efficient oil gas clean system | |
| CN220371051U (en) | Desorption device of VOCs adsorbent | |
| CN104772035A (en) | Volatile organic compound processing device | |
| CN220214421U (en) | Adsorption and desorption system for realizing concentration reduction treatment of VOCs (volatile organic compounds) by resin combined with activated carbon | |
| CN110665334A (en) | Organic waste gas treatment process combining runner concentration and thermal storage oxidation | |
| CN219462554U (en) | Ethyl acetate condensation recovery system | |
| CN213294685U (en) | Efficient VPSA system oxygen system | |
| CN214552344U (en) | Voc waste gas carbon fiber adsorbs purification regenerating unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |