CN116078104A - VOCs purifying and recycling treatment system and method based on fixed bed - Google Patents

VOCs purifying and recycling treatment system and method based on fixed bed Download PDF

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CN116078104A
CN116078104A CN202310064041.6A CN202310064041A CN116078104A CN 116078104 A CN116078104 A CN 116078104A CN 202310064041 A CN202310064041 A CN 202310064041A CN 116078104 A CN116078104 A CN 116078104A
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fixed bed
adsorption
desorption
valve
treatment
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彭洪根
韩栋
马梦祥
萧跃鹏
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Nanchang University
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Nanchang University
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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
    • B01D53/02—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
    • 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
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/44—Organic components
    • 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
    • B01D53/8678—Removing components of undefined structure
    • B01D53/8687—Organic components
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

The invention discloses a VOCs purifying and recycling system and method based on a fixed bed. The pretreatment system comprises a filter, a booster fan and a control valve which are sequentially arranged; the fixed bed treatment system comprises at least three groups of fixed beds which are arranged in parallel, wherein at least one group of fixed beds are respectively in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage in the same time period; the condensation recovery system comprises a precooler, a condenser and a liquid collecting tank which are sequentially arranged. The method can realize 1) improving the VOCs removal efficiency and optimizing the purification effect; 2) The combustion equipment is removed, so that the energy consumption is reduced, and secondary pollution is avoided; 3) The multiple processes are performed simultaneously, so that the operation efficiency of the process is improved; 4) Realize the recycling of high-value organic waste gas.

Description

VOCs purifying and recycling treatment system and method based on fixed bed
Technical Field
The invention relates to the field of waste gas pollution control, in particular to a VOCs purifying and recycling treatment system and method based on a fixed bed.
Background
Volatile Organic Compounds (VOCs) can be classified into alkanes (except methane), alkenes, halohydrocarbons, aromatic hydrocarbons and organic compounds containing oxygen, nitrogen and sulfur according to the types, and are mainly derived from industries such as chemical pharmacy, petroleum industry, transportation, printing and coating and the like. VOCs and nitrogen oxides act under illumination to generate photochemical smog, and are also important precursor substances such as dust haze, ozone and the like, so that the VOCs and the nitrogen oxides are one of main sources causing atmospheric pollution, seriously endanger the physical health of people and influence the sustainable development of the economy and the society.
The technology for treating VOCs at the present stage is a zeolite rotary-regenerative combustion method and mainly comprises the key steps of zeolite molecular sieve adsorption, hot air flow blowing regeneration, catalytic combustion and the like. Although the device is widely applied in industry, most of the device still adopts two sets of equipment of adsorption and catalytic oxidation, the whole structure of the device is huge, the operation is complex, the investment cost is high, the device has the defects of large energy consumption, insufficient combustion, secondary pollution and the like, and the device cannot be effectively recycled when the device is used for treating high-value organic waste gas.
The method aims to solve the problems of complex flow, huge energy consumption, low treatment efficiency, difficult recycling and the like of the existing treatment process/system.
Disclosure of Invention
In order to overcome the problems, the application provides a simple and efficient novel VOCs purifying treatment and recycling system and method, and the invention aims at: 1) The VOCs removal efficiency is improved, and the purification effect is optimized; 2) The combustion equipment is removed, so that the energy consumption is reduced, and secondary pollution is avoided; 3) The multiple processes are performed simultaneously, so that the operation efficiency of the process is improved; 4) Realize the recycling of high-value organic waste gas.
The technical scheme adopted for solving the technical problems is as follows:
VOCs purification and recovery processing system based on fixed bed includes
The pretreatment system comprises a filter, a booster fan and a control valve which are sequentially arranged; the control valve comprises a treatment end control valve and a recovery end control valve which are respectively communicated with the fixed bed treatment system and the condensation recovery system, so that the fixed bed treatment system is connected with the condensation recovery system in parallel;
the fixed bed treatment system comprises at least three groups of fixed beds which are arranged in parallel, a hot air blower, an exhaust drum and a concentration monitor; any fixed bed is communicated with a treatment end control valve through an adsorption inlet valve, an exhaust barrel through an adsorption outlet valve, a drum air heater through a desorption inlet valve and an exhaust barrel through a desorption outlet valve;
at least one group of fixed beds are respectively positioned in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage in the same time period, and the treatment stages of all groups of fixed beds are alternately and continuously carried out according to the stage sequences of adsorption enrichment, desorption purification and natural cooling;
the condensation recovery system comprises a precooler, a condenser and a liquid collecting tank which are sequentially arranged, wherein a heat flow inlet of the precooler is communicated with a recovery end control valve, and a heat flow outlet of the precooler is respectively communicated to the pretreatment system and the condenser through a treatment section control valve and a recovery section control valve.
As an improvement of the technical scheme, when the treatment end control valve and the treatment section control valve are opened and the recovery end control valve and the recovery section control valve are closed, the fixed bed treatment system works and the condensation recovery system does not work; when the treatment end control valve and the treatment section control valve are closed and the recovery end control valve and the recovery section control valve are opened, the fixed bed treatment system does not work and the condensation recovery system works.
As an improvement of the technical scheme, the zeolite molecular sieve of the fixed bed layer is loaded with a high-efficiency catalyst.
As an improvement of the technical scheme, the fixed bed treatment system comprises three groups of fixed beds which are arranged in parallel;
the treatment end control valve is connected with a first adsorption inlet valve, a second adsorption inlet valve and a third adsorption inlet valve in parallel and is respectively communicated with top inlets of the first fixed bed, the second fixed bed and the third fixed bed;
the first adsorption outlet valve, the second adsorption outlet valve and the third adsorption outlet valve which are communicated with the bottom outlets of the first fixed bed, the second fixed bed and the third fixed bed are connected in parallel and then communicated with the exhaust funnel;
the drum air heater is connected with a first desorption inlet valve, a second desorption inlet valve and a third desorption inlet valve in parallel, and is respectively communicated with bottom inlets of a first fixed bed, a second fixed bed and a third fixed bed;
and the first desorption outlet valve, the second desorption outlet valve and the third desorption outlet valve which are communicated to the top outlets of the first fixed bed, the second fixed bed and the third fixed bed are connected in parallel and then communicated to the exhaust funnel through the concentration monitor.
As an improvement of the technical scheme, in the same time period, the three groups of fixed beds are respectively in three stages of adsorption enrichment, desorption purification and natural cooling by automatically controlling the inlet and outlet valves; after the adsorption enrichment of a certain group of fixed beds is finished, the fixed beds enter a desorption purification stage, when the fixed beds of a certain group finish desorption purification, the fixed beds enter a natural cooling stage, and when the fixed beds of a certain group finish natural cooling, the fixed beds enter an adsorption enrichment stage; the treatment stages of the same fixed bed are alternately and consecutively carried out.
As an improvement of the technical scheme, the concentration monitor is further provided with a branch communicated with the precooler.
As an improvement of the technical scheme, a heat flow inlet of the precooler is connected with a concentration monitor of the fixed bed treatment system and a recovery end control valve of the pretreatment system, and a heat flow outlet of the precooler is connected with a booster fan inlet of the pretreatment system through a treatment section control valve and is connected with a heat flow inlet of the condenser through a recovery section control valve.
As an improvement of the technical scheme, the precooler and the condenser are communicated with a cold source, and the cold source flows in through a cold source inlet pipeline and flows out through a cold source outlet pipeline.
As an improvement of the technical proposal, the output end of the liquid phase product of the condenser is communicated with the liquid collecting tank through the first infusion pump,
the output end of the liquid collecting tank is connected with a second infusion pump, and the output end of the gas-phase product of the condenser is connected with the exhaust funnel through an exhaust valve.
The invention also provides a VOCs purifying and recycling treatment method based on the fixed bed, which comprises the following steps:
s1 pretreatment
The waste gas is filtered to remove large particle dust, compressed waste gas is formed through a booster fan, and according to the characteristics of the treated waste gas and the related factory requirements, if the waste gas is VOCs waste gas with low concentration and no recycling value, a treatment end control valve is opened, a recovery end control valve is closed, and the flue gas enters a fixed bed treatment system for purification treatment; if the waste gas is high-value and recyclable, the control valve of the treatment end is closed, the control valve of the recycling end is opened, and the flue gas enters a condensation recycling system for recycling;
s2 fixed bed treatment
The low-concentration VOCs waste gas enters a fixed bed treatment system, and at least one group of fixed beds are respectively in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage by automatically controlling inlet and outlet valves in the same time period;
when the fixed bed is in the adsorption enrichment stage, the zeolite molecular sieve adsorbs and enriches VOCs molecules in the waste gas, and the adsorbed gas is discharged from an exhaust drum through an adsorption outlet valve; after the fixed bed completes adsorption enrichment, the desorption purification stage is carried out;
when the fixed bed is in the desorption purification stage, the hot air blower blows hot air into the fixed bed through a desorption inlet valve, VOCs adsorbed and enriched on the zeolite molecular sieve are removed, meanwhile, the high-efficiency catalyst loaded on the zeolite molecular sieve is used for degrading the VOCs under the high-temperature condition, and after the waste gas is fully degraded, the waste gas enters a concentration monitor through a desorption outlet valve to detect whether the waste gas reaches the standard for discharge or secondary treatment; when the fixed bed finishes desorption and purification, the fixed bed enters a natural cooling stage;
when all the communication valves of the fixed bed are in a closed state, the fixed bed is in a natural cooling stage; after the fixed bed is naturally cooled, the fixed bed enters an adsorption enrichment stage;
the treatment stages of each group of fixed beds are alternately and continuously carried out according to the stage sequence of adsorption enrichment, desorption purification and natural cooling;
s3 condensation recovery
The high-value organic waste gas enters a condensation recovery system, enters a precooler for cooling, enters a condenser for deep cooling after preliminary cooling, and simultaneously generates a liquid phase product; the gas which cannot be condensed and recovered is led out from the condenser and enters an exhaust barrel through an exhaust valve to be discharged; the liquid phase product generated by the condenser is conveyed to the liquid collecting tank through the first infusion pump, and the liquid phase product in the liquid collecting tank is conveyed through the second infusion pump for purification, recycling of the production process or external sales.
As an improvement of the above technical solution, the S2 fixed bed treatment comprises the following treatment stages performed simultaneously:
s2.1 adsorption enrichment
The first adsorption inlet valve and the first adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the first fixed bed is used for adsorbing and enriching VOCs in the waste gas; the second adsorption inlet valve and the second adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the second fixed bed is used for adsorbing and enriching VOCs in the waste gas; the third adsorption inlet valve and the third adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the third fixed bed is used for adsorbing and enriching VOCs in the waste gas;
the fixed bed is converted into a desorption purification stage after the fixed bed is saturated in adsorption;
s2.2 Desorption purification
The first desorption inlet valve and the first desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the first fixed bed is used for desorption regeneration and catalytic purification treatment of VOCs; the second desorption inlet valve and the second desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the second fixed bed is used for desorbing, regenerating and catalyzing and purifying VOCs; the third desorption inlet valve and the third desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the third fixed bed is used for desorbing, regenerating and catalyzing and purifying VOCs;
after the fixed bed desorption and purification are completed, the regenerated fixed bed is converted into a natural cooling stage;
s2.3 Natural Cooling
The first adsorption inlet valve, the first adsorption outlet valve, the first desorption inlet valve and the first desorption outlet valve are closed, and the first fixed bed is used for natural cooling; the second adsorption inlet valve, the second adsorption outlet valve, the second desorption inlet valve and the second desorption outlet valve are closed, and the second fixed bed is used for natural cooling; the third adsorption inlet valve, the third adsorption outlet valve, the third desorption inlet valve and the third desorption outlet valve are closed, and the third fixed bed is used for natural cooling;
and after the fixed bed is completely cooled, the cooled fixed bed is converted into an adsorption enrichment stage.
The invention has the beneficial effects that:
1. the method eliminates the combustion device in the traditional treatment process, reduces energy consumption, simplifies the technical process, and avoids secondary pollution caused by combustion.
2. Based on the process improvement of the fixed bed, the high-efficiency catalyst is loaded on the zeolite molecular sieve for adsorption, and the catalytic treatment of VOCs is realized while the desorption and regeneration of the hot blast are carried out.
3. The adsorption enrichment, desorption catalysis and natural cooling are carried out simultaneously, so that the problem of low efficiency of the traditional fixed bed process is solved, and the process benefit is greatly improved.
4. The system can recycle the organic waste gas with high value, saves resources and realizes cyclic utilization.
5. The discharged gas treated by the process reaches the discharge concentration, and most of the discharged gas reaches CO 2 And the like, and is easy for subsequent treatment.
Drawings
The invention is further described with reference to the drawings and the specific embodiments below:
FIG. 1 is a schematic diagram of a fixed bed-based VOCs purification and recovery treatment system of the present invention;
in the figure:
the system comprises a 1-filter, a 2-booster fan, a 3-treatment end control valve, a 4-recovery end control valve, a 5-first fixed bed, a 501-first adsorption inlet valve, a 502-first adsorption outlet valve, a 503-first desorption inlet valve, a 504-first desorption outlet valve, a 6-second fixed bed, a 601-second adsorption inlet valve, a 602-second adsorption outlet valve, a 603-second desorption inlet valve, a 604-second desorption outlet valve, a 7-third fixed bed, a 701-third adsorption inlet valve, a 702-third adsorption outlet valve, a 703-third desorption inlet valve, a 704-third desorption outlet valve, an 8-drum air heater, a 9-concentration monitor, a 10-precooler, a 101-cold source inlet pipeline, a 102-cold source outlet pipeline, a 11-treatment section control valve, a 12-recovery section control valve, a 13-condenser, a 131-cold source inlet pipeline, a 132-cold source outlet pipeline, a 14-collecting tank, a 141-first infusion pump, a 142-second infusion pump, a 15-exhaust valve and a 16-exhaust gas drum.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "circumferential," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, the meaning of "a plurality" means at least two, for example, two, three, etc., unless explicitly defined otherwise, the meaning of "a number" means one or more.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1, a fixed bed-based VOCs purification and recovery treatment system comprising:
the device comprises a pretreatment system, a fixed bed treatment system and a condensation recovery system, wherein the fixed bed treatment system comprises subsystems such as an adsorption enrichment assembly, a desorption purification assembly, a natural cooling assembly and the like; the fixed bed treatment system is connected with the condensation recovery system in parallel; and an adsorption enrichment assembly, a desorption purification assembly and a natural cooling assembly which are formed by the fixed bed treatment system are connected in parallel.
In this embodiment, the pretreatment system includes a filter 1, a booster fan 2, and a control valve, which are sequentially arranged; the control valve comprises a treatment end control valve 3 and a recovery end control valve 4 which are respectively communicated with the fixed bed treatment system and the condensation recovery system, so that the fixed bed treatment system and the condensation recovery system are connected in parallel.
The outlet of the filter 1 is connected with the inlet of the booster fan 2, and the outlet of the booster fan 2 is connected with the treatment end control valve 3 and the recovery end control valve 4 in parallel and then is respectively connected with the fixed bed treatment system and the condensation recovery system. When the discharged waste gas is low-concentration VOCs, the treatment end control valve 3 is opened, the recovery end control valve 4 is closed, and the air flow enters the fixed bed treatment system; when the organic waste gas which can be recycled and has high utilization value is discharged, the treatment end control valve 3 is closed, the recycling end control valve 4 is opened, and the air flow enters the condensation recycling system.
In the embodiment, the fixed bed treatment system comprises three groups of fixed beds which are arranged in parallel, a drum heater 8, a concentration monitor 9 and an exhaust funnel 16; the zeolite molecular sieve of the fixed bed layer is loaded with a high-efficiency catalyst, and any fixed bed is communicated with a treatment end control valve 3 through an adsorption inlet valve, an exhaust drum 16 through an adsorption outlet valve, a hot blast blower 8 through a desorption inlet valve and the exhaust drum 16 through a desorption outlet valve;
at least one group of fixed beds are respectively positioned in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage in the same time period, so that an adsorption enrichment assembly, a desorption purification assembly and a natural cooling assembly which are arranged in parallel are formed, and the treatment stages of the fixed beds are alternately and continuously carried out according to the stage sequence of adsorption enrichment, desorption purification and natural cooling.
Specific:
the treatment end control valve 3 is connected with a first adsorption inlet valve 501, a second adsorption inlet valve 601 and a third adsorption inlet valve 701 in parallel and is respectively communicated with top inlets of a first fixed bed 5, a second fixed bed 6 and a third fixed bed 7;
the first adsorption outlet valve 502, the second adsorption outlet valve 602 and the third adsorption outlet valve 702 which are communicated to the bottom outlets of the first fixed bed 5, the second fixed bed 6 and the third fixed bed 7 are connected in parallel and then communicated to the exhaust funnel 16;
the air blower 8 is connected with a first desorption inlet valve 503, a second desorption inlet valve 603 and a third desorption inlet valve 703 in parallel and is respectively communicated with bottom inlets of a first fixed bed 5, a second fixed bed 6 and a third fixed bed 7;
the first desorption outlet valve 504, the second desorption outlet valve 604 and the third desorption outlet valve 704 which are communicated to the top outlets of the first fixed bed 5, the second fixed bed 6 and the third fixed bed 7 are connected in parallel and then communicated to the exhaust funnel 16 through the concentration monitor 9; the concentration monitor 9 is also provided with a bypass communication to the precooler 10.
In the same time period, the three groups of fixed beds are respectively in three stages of adsorption enrichment, desorption purification and natural cooling by automatically controlling the inlet and outlet valves; after the adsorption enrichment of a certain group of fixed beds is finished, the fixed beds enter a desorption purification stage, when the fixed beds of a certain group finish desorption purification, the fixed beds enter a natural cooling stage, and when the fixed beds of a certain group finish natural cooling, the fixed beds enter an adsorption enrichment stage; the treatment stages of the same fixed bed are alternately and consecutively carried out.
In the following, taking adsorption enrichment of the first fixed bed 5, desorption of the second fixed bed 6, catalytic purification of waste gas and natural cooling of the third fixed bed 7 as examples, the communication structure and operation mode of each fixed bed are introduced:
the first adsorption inlet valve 501 and the first adsorption outlet valve 502 are opened, the second adsorption inlet valve 601, the second adsorption outlet valve 602, the third adsorption inlet valve 701 and the third adsorption outlet valve 702 are closed, the low-concentration waste gas without recovery value enters the first fixed bed 5 from the first adsorption inlet valve 501 after passing through the pretreatment system and the treatment end control valve 3, the zeolite molecular sieve fully distributed on the bed layer of the first fixed bed 5 can adsorb and enrich VOCs molecules in the waste gas, and the adsorbed gas is discharged from the first adsorption outlet valve 502 to the exhaust pipe 16;
the second desorption inlet valve 603 and the second desorption outlet valve 604 are opened, the first desorption inlet valve 503, the first desorption outlet valve 504, the first desorption inlet valve 503 and the first desorption outlet valve 504 are closed, the hot air blower 8 blows hot air into the second fixed bed 6 through the second desorption inlet valve 603, VOCs adsorbed and enriched on the fixed bed layer are removed, meanwhile, the high-efficiency catalyst loaded on the bed layer realizes the degradation of the VOCs under the high temperature condition, the fixed bed completes desorption regeneration, and the waste gas enters the concentration monitor 9 through the second desorption outlet valve 604 after being fully degraded to detect whether the waste gas reaches the standard;
all the connecting switches of the third fixed bed 7 are in a closed state, and the fixed bed is in a natural cooling state.
In this embodiment, the condensation recovery system includes a precooler 10, a condenser 13, and a liquid collecting tank 14 sequentially arranged, wherein a heat flow inlet of the precooler 10 is communicated with a recovery end control valve 4 and a concentration monitor 9, and a heat flow outlet of the precooler is respectively communicated with a pretreatment system and the condenser 13 through a treatment section control valve 11 and a recovery section control valve 12. The precooler 10 and the condenser 13 are communicated with an external cold source, and the cold source flows in through cold source inlet pipelines 101 and 131 and flows out through a cold source outlet pipeline 102,132.
When the waste gas which does not reach the standard is reprocessed, the recovery end control valve 4 and the recovery section control valve 12 are closed, the treatment end control valve 3 and the treatment section control valve 11 are opened, and the cooled waste gas is led into the booster fan 2 again and enters a subsequent fixed bed treatment system for secondary treatment; when the introduced flue gas is high-value organic waste gas, the recovery end control valve 4 and the recovery section control valve 12 are opened, the treatment end control valve 3 and the treatment section control valve 11 are closed, and the waste gas enters the condensation recovery system to liquefy and recover the required products.
The condensation recovery system further comprises a first infusion pump 141 and a second infusion pump 142, wherein the output end of the liquid phase product of the condenser 13 is connected to the liquid collecting tank 14 through the first infusion pump 141, the output end of the liquid collecting tank 14 is connected to the second infusion pump 142, and the output end of the gas phase product of the condenser 13 is connected with the exhaust funnel 16 through the valve 15.
Example 2
A VOCs purifying and recycling treatment method based on a fixed bed comprises the following steps:
s1 pretreatment
The waste gas passes through a filter 1 to remove large particle dust, compressed waste gas is formed by a booster fan 2, and according to the characteristics of the treated waste gas and the requirements of related factories, if the waste gas is VOCs waste gas with low concentration and no recycling value, a treatment end control valve 3 is opened, a recovery end control valve 4 is closed, and the flue gas enters a fixed bed treatment system for purification treatment; if the waste gas is high-value and recyclable, the treatment end control valve 3 is closed, the recycling end control valve 4 is opened, and the flue gas enters a condensation recycling system for recycling;
when the treatment end control valve 3 and the treatment section control valve 11 are opened and the recovery end control valve 4 and the recovery section control valve 12 are closed, the fixed bed treatment system works and the condensation recovery system does not work; when the treatment end control valve 3 and the treatment section control valve 11 are closed and the recovery end control valve 4 and the recovery section control valve 12 are opened, the fixed bed treatment system is not operated and the condensation recovery system is operated;
s2 fixed bed treatment
The low-concentration VOCs waste gas enters a fixed bed treatment system, and at least one group of fixed beds are respectively in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage by automatically controlling inlet and outlet valves in the same time period;
when the fixed bed is in the adsorption enrichment stage, the zeolite molecular sieve adsorbs and enriches VOCs molecules in the waste gas, and the adsorbed gas is discharged from the exhaust pipe 16 through the adsorption outlet valve; after the fixed bed completes adsorption enrichment, the desorption purification stage is carried out;
when the fixed bed is in the desorption purification stage, the hot air blower 8 blows hot air into the fixed bed through a desorption inlet valve, VOCs adsorbed and enriched on the zeolite molecular sieve are removed, meanwhile, the high-efficiency catalyst loaded on the zeolite molecular sieve is used for degrading the VOCs under the high-temperature condition, and after the waste gas is fully degraded, the waste gas enters a concentration monitor 9 through a desorption outlet valve to detect whether the waste gas reaches the standard or not so as to be discharged or subjected to secondary treatment; when the fixed bed finishes desorption and purification, the fixed bed enters a natural cooling stage;
when all the communication valves of the fixed bed are in a closed state, the fixed bed is in a natural cooling stage; after the fixed bed is naturally cooled, the fixed bed enters an adsorption enrichment stage;
the treatment stages of each group of fixed beds are alternately and continuously carried out according to the stage sequence of adsorption enrichment, desorption purification and natural cooling;
s3 condensation recovery
The high-value organic waste gas enters a condensation recovery system, enters a precooler 10 for cooling, and enters a condenser 13 for deep cooling after preliminary cooling, and meanwhile, liquid phase products are produced; the gas which cannot be condensed and recovered is led out from the condenser 13 and enters the exhaust barrel 16 through the exhaust valve 15 to be discharged; the liquid phase product generated by the condenser 13 is conveyed to the liquid collecting tank 14 through the first liquid conveying pump 141, and the liquid phase product in the liquid collecting tank 14 is conveyed through the second liquid conveying pump 142 for purification, recycling of the production process or external sales.
In this example, the S2 fixed bed treatment includes the following treatment stages performed simultaneously:
s2.1 adsorption enrichment
The first adsorption inlet valve 501 and the first adsorption outlet valve 502 are opened, and when the rest adsorption inlet and outlet valves are closed, the first fixed bed 5 is used for adsorbing and enriching VOCs in the waste gas; the second adsorption inlet valve 601 and the second adsorption outlet valve 602 are opened, and when the rest adsorption inlet and outlet valves are closed, the second fixed bed 6 is used for adsorbing and enriching VOCs in the waste gas; the third adsorption inlet valve 701 and the third adsorption outlet valve 702 are opened, and when the rest adsorption inlet and outlet valves are closed, the third fixed bed 7 is used for adsorbing and enriching VOCs in the waste gas;
the fixed bed is converted into a desorption purification stage after the fixed bed is saturated in adsorption;
s2.2 Desorption purification
The first desorption inlet valve 503 and the first desorption outlet valve 504 are opened, and when the other adsorption inlet and outlet valves are closed, the first fixed bed 5 is used for desorbing, regenerating and catalyzing and purifying VOCs; the second desorption inlet valve 603 and the second desorption outlet valve 604 are opened, and when the other adsorption inlet and outlet valves are closed, the second fixed bed 6 is used for desorbing, regenerating and catalyzing and purifying VOCs; the third desorption inlet valve 703 and the third desorption outlet valve 704 are opened, and when the other adsorption inlet and outlet valves are closed, the third fixed bed 7 is used for desorbing, regenerating and catalyzing and purifying VOCs;
after the fixed bed desorption and purification are completed, the regenerated fixed bed is converted into a natural cooling stage;
s2.3 Natural Cooling
The first adsorption inlet valve 501, the first adsorption outlet valve 502, the first desorption inlet valve 503 and the first desorption outlet valve 504 are closed, and the first fixed bed 5 is used for natural cooling; the second adsorption inlet valve 601, the second adsorption outlet valve 602, the second desorption inlet valve 603 and the second desorption outlet valve 604 are closed, and the second fixed bed 6 is used for natural cooling; the third adsorption inlet valve 701, the third adsorption outlet valve 702, the third desorption inlet valve 703 and the third desorption outlet valve 704 are closed, and the third fixed bed 7 is used for natural cooling;
and after the fixed bed is completely cooled, the cooled fixed bed is converted into an adsorption enrichment stage.
It should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. VOCs purifies and recovery processing system based on fixed bed, its characterized in that: comprising
The pretreatment system comprises a filter, a booster fan and a control valve which are sequentially arranged; the control valve comprises a treatment end control valve and a recovery end control valve which are respectively communicated with the fixed bed treatment system and the condensation recovery system, so that the fixed bed treatment system is connected with the condensation recovery system in parallel;
the fixed bed treatment system comprises at least three groups of fixed beds which are arranged in parallel, a hot air blower, an exhaust drum and a concentration monitor; any fixed bed is communicated with a treatment end control valve through an adsorption inlet valve, an exhaust barrel through an adsorption outlet valve, a drum air heater through a desorption inlet valve and an exhaust barrel through a desorption outlet valve;
at least one group of fixed beds are respectively positioned in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage in the same time period, and the treatment stages of all groups of fixed beds are alternately and continuously carried out according to the stage sequences of adsorption enrichment, desorption purification and natural cooling;
the condensation recovery system comprises a precooler, a condenser and a liquid collecting tank which are sequentially arranged, wherein a heat flow inlet of the precooler is communicated with a recovery end control valve, and a heat flow outlet of the precooler is respectively communicated to the pretreatment system and the condenser through a treatment section control valve and a recovery section control valve.
2. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the fixed bed treatment system comprises three groups of fixed beds which are arranged in parallel;
the treatment end control valve is connected with a first adsorption inlet valve, a second adsorption inlet valve and a third adsorption inlet valve in parallel and is respectively communicated with top inlets of the first fixed bed, the second fixed bed and the third fixed bed;
the first adsorption outlet valve, the second adsorption outlet valve and the third adsorption outlet valve which are communicated with the bottom outlets of the first fixed bed, the second fixed bed and the third fixed bed are connected in parallel and then communicated with the exhaust funnel;
the drum air heater is connected with a first desorption inlet valve, a second desorption inlet valve and a third desorption inlet valve in parallel, and is respectively communicated with bottom inlets of a first fixed bed, a second fixed bed and a third fixed bed;
and the first desorption outlet valve, the second desorption outlet valve and the third desorption outlet valve which are communicated to the top outlets of the first fixed bed, the second fixed bed and the third fixed bed are connected in parallel and then communicated to the exhaust funnel through the concentration monitor.
3. The fixed bed based VOCs purification and recovery treatment system of claim 2 wherein:
in the same time period, the three groups of fixed beds are respectively in three stages of adsorption enrichment, desorption purification and natural cooling by automatically controlling the inlet and outlet valves;
after the adsorption enrichment of a certain group of fixed beds is finished, the fixed beds enter a desorption purification stage, when the fixed beds of a certain group finish desorption purification, the fixed beds enter a natural cooling stage, and when the fixed beds of a certain group finish natural cooling, the fixed beds enter an adsorption enrichment stage;
the treatment stages of the same fixed bed are alternately and consecutively carried out.
4. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the concentration monitor is also provided with a branch communicated with the precooler.
5. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the zeolite molecular sieve of the fixed bed layer is loaded with a high-efficiency catalyst.
6. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the heat flow inlet of the precooler is connected with the concentration monitor of the fixed bed treatment system and the recovery end control valve of the pretreatment system, the heat flow outlet of the precooler is connected with the inlet of the booster fan of the pretreatment system through the treatment section control valve, and the heat flow outlet of the precooler is connected with the heat flow inlet of the condenser through the recovery section control valve.
7. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the precooler and the condenser are communicated with a cold source, and the cold source flows in through a cold source inlet pipeline and flows out through a cold source outlet pipeline.
8. The fixed bed based VOCs purification and recovery treatment system of claim 1, wherein:
the liquid phase product output end of the condenser is communicated to the liquid collecting tank through the first infusion pump, the output end of the liquid collecting tank is connected with the second infusion pump, and the gas phase product output end of the condenser is connected with the exhaust funnel through the exhaust valve.
9. The VOCs purifying and recycling treatment method based on the fixed bed is characterized by comprising the following steps of: the method is applied to the fixed bed-based VOCs purifying and recycling system as claimed in any one of claims 1 to 8, and comprises the following steps:
s1 pretreatment
The waste gas is filtered to remove large particle dust, compressed waste gas is formed through a booster fan, and according to the characteristics of the treated waste gas and the related factory requirements, if the waste gas is VOCs waste gas with low concentration and no recycling value, a treatment end control valve is opened, a recovery end control valve is closed, and the flue gas enters a fixed bed treatment system for purification treatment; if the waste gas is high-value and recyclable, the control valve of the treatment end is closed, the control valve of the recycling end is opened, and the flue gas enters a condensation recycling system for recycling;
s2 fixed bed treatment
The low-concentration VOCs waste gas enters a fixed bed treatment system, and at least one group of fixed beds are respectively in an adsorption enrichment stage, a desorption purification stage and a natural cooling stage by automatically controlling each inlet and outlet valve;
when the fixed bed is in the adsorption enrichment stage, the zeolite molecular sieve adsorbs and enriches VOCs molecules in the waste gas, and the adsorbed gas is discharged from an exhaust drum through an adsorption outlet valve; after the fixed bed completes adsorption enrichment, the desorption purification stage is carried out;
when the fixed bed is in the desorption purification stage, the hot air blower blows hot air into the fixed bed through a desorption inlet valve, VOCs adsorbed and enriched on the zeolite molecular sieve are removed, meanwhile, the high-efficiency catalyst loaded on the zeolite molecular sieve is used for degrading the VOCs under the high-temperature condition, and after the waste gas is fully degraded, the waste gas enters a concentration monitor through a desorption outlet valve to detect whether the waste gas reaches the standard for discharge or secondary treatment; when the fixed bed finishes desorption and purification, the fixed bed enters a natural cooling stage;
when all the communication valves of the fixed bed are in a closed state, the fixed bed is in a natural cooling stage; after the fixed bed is naturally cooled, the fixed bed enters an adsorption enrichment stage;
the treatment stages of each group of fixed beds are alternately and continuously carried out according to the stage sequence of adsorption enrichment, desorption purification and natural cooling;
s3 condensation recovery
The high-value organic waste gas enters a condensation recovery system, enters a precooler for cooling, enters a condenser for deep cooling after preliminary cooling, and simultaneously generates a liquid phase product; the gas which cannot be condensed and recovered is led out from the condenser and enters an exhaust barrel through an exhaust valve to be discharged; the liquid phase product generated by the condenser is conveyed to the liquid collecting tank through the first infusion pump, and the liquid phase product in the liquid collecting tank is conveyed through the second infusion pump for purification, recycling of the production process or external sales.
10. The fixed bed-based VOCs purification and recovery treatment process of claim 9, wherein:
the S2 fixed bed treatment comprises the following treatment stages which are carried out simultaneously:
s2.1 adsorption enrichment
The first adsorption inlet valve and the first adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the first fixed bed is used for adsorbing and enriching VOCs in the waste gas; the second adsorption inlet valve and the second adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the second fixed bed is used for adsorbing and enriching VOCs in the waste gas; the third adsorption inlet valve and the third adsorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the third fixed bed is used for adsorbing and enriching VOCs in the waste gas;
the fixed bed is converted into a desorption purification stage after the fixed bed is saturated in adsorption;
s2.2 Desorption purification
The first desorption inlet valve and the first desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the first fixed bed is used for desorption regeneration and catalytic purification treatment of VOCs; the second desorption inlet valve and the second desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the second fixed bed is used for desorbing, regenerating and catalyzing and purifying VOCs; the third desorption inlet valve and the third desorption outlet valve are opened, and when the rest adsorption inlet and outlet valves are closed, the third fixed bed is used for desorbing, regenerating and catalyzing and purifying VOCs;
after the fixed bed desorption and purification are completed, the regenerated fixed bed is converted into a natural cooling stage;
s2.3 Natural Cooling
The first adsorption inlet valve, the first adsorption outlet valve, the first desorption inlet valve and the first desorption outlet valve are closed, and the first fixed bed is used for natural cooling; the second adsorption inlet valve, the second adsorption outlet valve, the second desorption inlet valve and the second desorption outlet valve are closed, and the second fixed bed is used for natural cooling; the third adsorption inlet valve, the third adsorption outlet valve, the third desorption inlet valve and the third desorption outlet valve are closed, and the third fixed bed is used for natural cooling;
and after the fixed bed is completely cooled, the cooled fixed bed is converted into an adsorption enrichment stage.
CN202310064041.6A 2023-01-19 2023-01-19 VOCs purifying and recycling treatment system and method based on fixed bed Pending CN116078104A (en)

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