CN110787589A - VOC organic waste gas adsorption and desorption treatment system and treatment method - Google Patents

VOC organic waste gas adsorption and desorption treatment system and treatment method Download PDF

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Publication number
CN110787589A
CN110787589A CN201911281416.4A CN201911281416A CN110787589A CN 110787589 A CN110787589 A CN 110787589A CN 201911281416 A CN201911281416 A CN 201911281416A CN 110787589 A CN110787589 A CN 110787589A
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waste gas
organic waste
heat exchange
activated carbon
adsorption
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钟璐
胡静龄
杨颖欣
胡小吐
刘勇
杨森林
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Guangdong Jiade Environmental Protection Technology Co Ltd
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Guangdong Jiade Environmental Protection Technology Co Ltd
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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
    • 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
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
    • B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas

Abstract

The invention provides a VOC organic waste gas adsorption and desorption treatment system and a treatment method, wherein the adsorption and desorption system comprises a pretreatment unit, a waste gas heat exchange unit and an active carbon adsorption unit which are sequentially connected; the pretreatment unit is used for removing oil mist and impurities in VOC organic waste gas, the waste gas heat exchange unit comprises a heat exchange device, the activated carbon adsorption unit comprises at least two activated carbon adsorption devices connected in parallel, and the heat exchange device and the activated carbon adsorption devices are respectively and independently connected in a circulating mode. The active carbon adsorption unit provided by the invention adopts a double-adsorption-bed design, two active carbon adsorption devices alternately adsorb, one adsorption bed is switched to desorption operation after being saturated in adsorption, and the other adsorption bed starts to perform adsorption operation, so that continuous treatment of organic waste gas is realized, and production line shutdown and cleaning caused by cleaning of the adsorption devices are avoided.

Description

VOC organic waste gas adsorption and desorption treatment system and treatment method
Technical Field
The invention belongs to the technical field of waste gas treatment, relates to a VOC organic waste gas treatment system and a treatment method, and particularly relates to an activated carbon adsorption and desorption treatment system and a treatment method for VOC organic waste gas.
Background
The volatile organic compounds in organic waste gas are called VOCs (volatile organic compounds), in many industries of coating, printing, shoe making and chemical production, the production process of some industrial products is accompanied with the discharge of a large amount of Volatile Organic Compound (VOCs) waste gas, the discharge of the VOCs waste gas into the atmospheric environment can have the following effects that ① VOCs are precursors of photochemical reaction, and when sunlight is irradiated, the VOCs and NO are mixed under proper conditionsx② photochemical smog can stimulate eyes and respiratory system of human, some VOCs also have strong pungent smell, when reaching a certain concentration in air, they will generate uncomfortable feeling to affect air quality, ③ toxic VOCs (such as aromatic hydrocarbon) gas in environment will harm human health, long time exposure in polluted air will cause canceration or other serious diseases, such as benzene damage to hematopoietic function of marrow, it is a carcinogen, toluene and xylene have strong anesthetic action to central nerve, chloroethylene is a carcinogen, therefore, VOCs in organic waste gas can be treated.
The organic waste gas is from various sources, and the generation mode and the emission mode are different. Therefore, the treatment technology of the organic waste gas is also diversified, and various treatment technologies have different advantages and disadvantages. In the actual production process, according to different situations, the selection of a proper method is the key of organic waste gas treatment. The organic waste gas treatment method mainly comprises a recovery method and a removal method. The recovery method mainly comprises the following steps: adsorption, absorption, condensation, membrane separation, pressure swing adsorption, and the like; the elimination method mainly comprises the following steps: physical-chemical methods and biological methods, wherein the physical-chemical methods include thermal destruction methods, photolysis methods, corona methods, ozone decomposition methods, and the like; biological methods include biofilters, biological trickling filters, biological scour towers, membrane bioreactors, activated sludge processes, and the like. For industrial waste gas treatment, a recovery method is more commonly used by virtue of the advantages of high purification rate, less secondary pollution and the like, wherein the purification rate of an activated carbon adsorption method can reach more than 95 percent, if no regeneration device is used, the operation cost is too high, if steam is used for recovery, the process flow is too long, the operation cost is high, and the utilization value of a mixture of a recovered solvent and water is not high; the regeneration needs a stable steam source, the adsorption capacity of the activated carbon is gradually reduced after repeated adsorption, and the activated carbon needs to be replaced after two or three years of use, so that the activated carbon needs to be desorbed and regenerated.
CN206810011U discloses a VOC treatment device suitable for recycling activated carbon, which comprises a conveying device, an activated carbon carrier, an adsorption system, a desorption system, a recovery system, a cooling system and a preheating system, wherein the conveying device is connected with the adsorption system, the desorption system and the cooling system and used for one-way loop line transportation of the activated carbon carrier, the adsorption system comprises a first air inlet, a filtering device and a first air outlet, VOC-containing waste gas enters the adsorption system through the first air inlet and is discharged through the first air outlet after fully reacting with the activated carbon carrier, the first air inlet and the first air outlet are both provided with VOC concentration monitoring devices, high-temperature steam is communicated in the desorption system, the high-temperature steam enters through a second air inlet and is guided out through the second air outlet and is used for desorbing VOC, the desorbed activated carbon carrier enters the cooling system and is transported to the adsorption system by the conveying device after cooling, the recovery system comprises a condensing device and a collecting device, the condensing device is communicated with the second gas outlet and used for liquefying VOC gas, generated liquid VOC is stored in the collecting device, high-temperature steam after condensation enters the preheating system, and the preheating system is connected with the second gas inlet.
CN205095613U discloses a VOC waste gas treatment device for pharmaceutical chemical industry, which comprises an acid mist adsorption tower connected with an air outlet of a VOC waste gas source, an active carbon adsorption bed device connected with the acid mist adsorption tower, a main exhaust fan connected with the active carbon adsorption bed device, and a chimney connected with the main exhaust fan along a waste gas treatment process; the active carbon adsorption bed device is also connected with a catalytic combustion device, the catalytic combustion device is connected with a desorption fan and a spray tower, one end of the desorption fan is connected with the tail end of the catalytic combustion device, the other end of the desorption fan is divided into two branches, one branch is connected with the tail end of the active carbon adsorption bed device, the other branch is connected with the initial end of the spray tower, and the tail end of the spray tower is connected with the main exhaust fan; the acid mist adsorption tower, the activated carbon adsorption bed device, the main exhaust fan, the catalytic combustion device, the desorption fan and the spray tower are respectively connected with the PLC control system.
CN208493713U discloses an active carbon adsorption desorption VOC organic waste gas processing system, includes: a dust removal device, an adsorption device and a draught fan; the adsorption device is arranged on the right side of the dust removal device and is connected with the dust removal device through a pipeline; the air-removing machine is arranged in the middle of the top end of the adsorption device, and the air-removing machine and the air suction device are connected in a bolt fixing mode.
However, the currently known organic waste gas treatment device cannot realize continuous treatment of organic waste gas and cannot realize alternate operation of the adsorption and desorption processes of activated carbon. On the other hand, the activated carbon needs to be desorbed by hot steam, so that the treatment cost is increased, and the desorbed hot steam cannot be effectively treated and reused, thereby causing great waste.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an adsorption and desorption treatment system and a treatment method for VOC organic waste gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an adsorption and desorption treatment system for VOC organic waste gas, which comprises a pretreatment unit, a waste gas heat exchange unit and an activated carbon adsorption unit, which are connected in sequence.
The pretreatment unit is used for removing oil mist and impurities in VOC organic waste gas, the waste gas heat exchange unit comprises a heat exchange device, the activated carbon adsorption unit comprises at least two activated carbon adsorption devices connected in parallel, and the heat exchange device and the activated carbon adsorption devices are respectively and independently connected in a circulating mode.
The active carbon adsorption unit provided by the invention adopts a double-adsorption-bed design, two active carbon adsorption devices alternately adsorb, one adsorption bed is switched to desorption operation after being saturated in adsorption, and the other adsorption bed starts to perform adsorption operation, so that continuous treatment of organic waste gas is realized, and production line shutdown and cleaning caused by cleaning of the adsorption devices are avoided.
As a preferable technical scheme of the invention, the heat exchange device is internally provided with a heat exchange medium channel and an organic waste gas channel which are mutually independent.
Preferably, the organic waste gas channel is respectively connected with the pretreatment unit and the activated carbon adsorption unit, and the organic waste gas channel enters the organic waste gas channel through the pretreatment unit, exchanges heat with the heat exchange medium in the heat exchange medium channel and then enters the activated carbon adsorption unit.
Preferably, the heat exchange medium channel is respectively and independently connected with the activated carbon adsorption device in a circulating manner, the heat exchange medium circularly flows between the heat exchange medium channel and the activated carbon adsorption device, and the heat exchange medium and the VOC organic waste gas are used for desorbing the activated carbon after heat exchange and temperature rise in the heat exchange device.
Preferably, the heat exchange medium is nitrogen.
According to the invention, nitrogen is used as a heat exchange medium, the heat of the organic waste gas is utilized to carry out heat exchange and temperature rise on the nitrogen, the heated nitrogen carries out desorption on the activated carbon, the heat of the organic waste gas is effectively utilized, and the desorption treatment can be completed without using steam.
As a preferred technical scheme of the invention, one end of the activated carbon adsorption device is provided with an organic waste gas inlet and a heat exchange medium outlet, and the other end of the activated carbon adsorption device is provided with an organic waste gas outlet and a heat exchange medium inlet;
preferably, the outlet ends of the organic waste gas channels are respectively and independently connected with an organic waste gas inlet of the activated carbon adsorption device;
preferably, the inlet ends of the heat exchange medium channels are respectively and independently connected with an organic waste gas outlet of the activated carbon adsorption device, and the outlet ends of the heat exchange medium channels are respectively and independently connected with an organic waste gas inlet of the activated carbon adsorption device.
Preferably, a condensing device is arranged on a connecting pipeline between the inlet end of the heat exchange medium channel and the organic waste gas outlet of the activated carbon adsorption device.
Preferably, the condensing device is externally connected with a collecting device.
As a preferable technical scheme of the invention, an organic waste gas inlet pipeline and an organic waste gas outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled adsorption valve.
Preferably, the heat exchange medium inlet pipeline and the heat exchange medium outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled desorption valve.
As a preferable technical solution of the present invention, the activated carbon adsorption unit includes a first activated carbon adsorption device and a second activated carbon adsorption device connected in parallel.
As a preferable technical solution of the present invention, the pretreatment unit includes an electrostatic oil trap.
The electrostatic oil trapping device is used for removing oil mist and impurities in the organic waste gas in advance to prevent active carbon from being blocked, the active carbon adsorption device adopts active carbon as an adsorbent and is mainly used for adsorbing harmful ingredients in the organic waste gas, the clean gas after electrostatic oil trapping and adsorption is discharged by an exhaust fan, and the VOC removal rate is more than 98%.
Preferably, a buffer device is further disposed on a connection pipeline between the electrostatic oil trapping device and the heat exchange device.
As a preferable technical solution of the present invention, the adsorption and desorption treatment system further includes a conveying device located on an inlet pipeline of the pretreatment unit.
Preferably, the conveying device is an air inlet machine.
Preferably, the outlet pipeline of the activated carbon adsorption unit is also provided with an exhaust device.
Preferably, the exhaust device is an exhaust fan.
In a second aspect, the invention provides an adsorption and desorption treatment method for VOC organic waste gas, which is to perform activated carbon adsorption treatment on the VOC organic waste gas by using the adsorption and desorption treatment system for VOC organic waste gas of the first aspect, and then perform high-temperature desorption on activated carbon to realize activated carbon regeneration, wherein the adsorption and desorption treatment method comprises the following steps:
the VOC organic waste gas enters a heat exchange device after oil mist and impurities in the VOC organic waste gas are removed through a pretreatment unit, enters an active carbon adsorption device after being subjected to heat exchange and temperature reduction with a heat exchange medium in the heat exchange device, and is introduced into the active carbon adsorption device to desorb active carbon after the heat exchange medium and the VOC organic waste gas are subjected to heat exchange and temperature rise so as to realize active carbon regeneration.
As a preferred technical solution of the present invention, the adsorption and desorption treatment method specifically includes the steps of:
removing oil mist and impurities in the VOC organic waste gas by an electrostatic oil trapping device, and then feeding the VOC organic waste gas into a heat exchange device, wherein the VOC organic waste gas exchanges heat with a heat exchange medium in a heat exchange medium channel in an organic waste gas channel to reduce the temperature;
(II) introducing the heat-exchanged VOC organic waste gas into a first activated carbon adsorption device to adsorb the VOC organic waste gas, after the VOC organic waste gas is saturated in adsorption, opening a heat exchange medium inlet and a heat exchange medium outlet of the first activated carbon adsorption device, allowing the heat exchange medium subjected to heat exchange with the VOC organic waste gas and heated to enter the first activated carbon adsorption device to heat and desorb the activated carbon subjected to saturated adsorption, allowing the heat exchange medium subjected to VOC adsorption to enter a condensing device, and condensing and collecting the VOC in the condensing device; opening an organic waste gas inlet and an organic waste gas outlet of a second activated carbon adsorption device while the first activated carbon adsorption device is desorbing, and introducing the heat-exchanged VOC organic waste gas into the second activated carbon adsorption device for adsorption;
(III) after the second activated carbon adsorption device is saturated in adsorption, opening a heat exchange medium inlet and a heat exchange medium outlet of the second activated carbon adsorption device, allowing a heat exchange medium subjected to heat exchange with the VOC organic waste gas and temperature rise to enter the second activated carbon adsorption device to perform heating desorption on the activated carbon saturated in adsorption, allowing the heat exchange medium adsorbed with the VOC to enter a condensing device, and condensing and collecting the VOC in the condensing device; opening an organic waste gas inlet and an organic waste gas outlet of the first activated carbon adsorption device while the second activated carbon adsorption device is desorbing, and introducing the heat-exchanged VOC organic waste gas into the first activated carbon adsorption device for adsorption;
and (IV) alternately performing the steps (II) and (III) to continuously adsorb the VOC organic waste gas.
In a preferred embodiment of the present invention, the volatile organic compounds in the VOC organic waste gas in step (i) include one or a combination of at least two of benzene, toluene, or xylene.
Preferably, the benzene content in the VOC organic waste gas is 80-120 mg/m3For example, it may be 80mg/m3、85mg/m3、90mg/m3、95mg/m3、100mg/m3、105mg/m3、110mg/m3、 115mg/m3Or 120mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the content of toluene in the VOC organic waste gas is 50-100 mg/m3For example, it may be 50mg/m3、55mg/m3、60mg/m3、65mg/m3、70mg/m3、75mg/m3、80mg/m3、85mg/m3、 90mg/m3、95mg/m3Or 100mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the content of xylene in the VOC organic waste gas is 80-120 mg/m3For example, it may be 80mg/m3、85mg/m3、90mg/m3、95mg/m3、100mg/m3、105mg/m3、110mg/m3、 115mg/m3Or 120mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the flow of the VOC organic waste gas is 10000-20000 m3H may be, for example, 10000m3/h、11000m3/h、12000m3/h、13000m3/h、14000m3/h、15000m3/h、16000m3/h、 17000m3/h、18000m3/h、19000m3H or 20000m3And/h, but not limited to, the recited values, and other values not recited within the range of values are equally applicable.
Preferably, the VOC organic waste gas is cooled to 150-180 ℃, for example, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃ or 180 ℃ by heat exchange with a heat exchange medium, but the VOC organic waste gas is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, the heat exchange medium is nitrogen.
Preferably, the first activated carbon adsorption device and the second activated carbon adsorption device in the step (II) and the step (III) are filled with activated carbon.
Preferably, the bulk density of the activated carbon is 400-600 kg/m3For example, it may be 400kg/m3、410kg/m3、420kg/m3、430kg/m3、440kg/m3、450kg/m3、460kg/m3、470kg/m3、 480kg/m3、490kg/m3、500kg/m3、510kg/m3、520kg/m3、530kg/m3、540kg/m3、 550kg/m3、560kg/m3、570kg/m3、580kg/m3、590kg/m3Or 600kg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the amount of activated carbon is 8000 to 9000kg, and may be, for example, 8000kg, 8100kg, 8200kg, 8300kg, 8400kg, 8500kg, 8600kg, 8700kg, 8800kg, 8900kg, or 9000kg, but is not limited to the enumerated values, and other non-enumerated values within the numerical range may be equally applicable.
Preferably, the heat exchange medium is heated to 80 to 120 ℃ by heat exchange with the VOC organic exhaust gas, and may be, for example, 80 ℃, 82 ℃, 84 ℃, 86 ℃, 88 ℃, 90 ℃, 92 ℃, 94 ℃, 96 ℃, 98 ℃, 100 ℃, 102 ℃, 104 ℃, 106 ℃, 108 ℃, 110 ℃, 112 ℃, 114 ℃, 116 ℃, 118 ℃ or 120 ℃, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the condensing device condenses the heat exchange medium having the VOC adsorbed thereon to 10 to 30 ℃, and may be, for example, 10 ℃, 12 ℃, 14 ℃, 16 ℃, 18 ℃, 20 ℃, 22 ℃, 24 ℃, 26 ℃, 28 ℃ or 30 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the benzene content in the VOC organic waste gas after the activated carbon adsorption in the step (IV) is less than or equal to 10mg/m3For example, it may be 1mg/m3、2mg/m3、3mg/m3、4mg/m3、5mg/m3、6mg/m3、7mg/m3、 8mg/m3、9mg/m3Or 10mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the content of toluene in the VOC organic waste gas after the adsorption of the activated carbon is less than or equal to 30mg/m3For example, it may be 1mg/m3、5mg/m3、10mg/m3、15mg/m3、20mg/m3、25mg/m3Or 30mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the content of dimethylbenzene in the VOC organic waste gas after the adsorption of the activated carbon is less than or equal to 60mg/m3For example, it may be 1mg/m3、5mg/m3、10mg/m3、15mg/m3、20mg/m3、25mg/m3、30mg/m3、35mg/m3、 40mg/m3、45mg/m3、50mg/m3、55mg/m3Or 60mg/m3However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
(1) the electrostatic oil trapping device is adopted to remove oil mist and impurities in the organic waste gas in advance and prevent active carbon from being blocked, the active carbon adsorption device adopts active carbon as an adsorbent and is mainly used for adsorbing harmful ingredients in the organic waste gas, the organic waste gas after electrostatic oil trapping and active carbon adsorption is discharged by an exhaust fan, and the discharged organic waste gas meets the national emission standard.
(2) The active carbon adsorption unit provided by the invention adopts a double-adsorption-bed design, two active carbon adsorption devices alternately adsorb, one adsorption bed is switched to desorption operation after being saturated in adsorption, and the other adsorption bed starts to perform adsorption operation, so that continuous treatment of organic waste gas is realized, the replacement period of the adsorbent is reduced, and the production line cannot be stopped and cleaned due to cleaning of the adsorption devices.
(3) According to the invention, nitrogen is used as a heat exchange medium, the heat of the organic waste gas is utilized to carry out heat exchange and temperature rise on the nitrogen, the heated nitrogen carries out desorption on the activated carbon, the heat of the organic waste gas is effectively utilized, and the desorption treatment can be completed without using steam.
Drawings
Fig. 1 is a schematic structural diagram of an adsorption and desorption treatment system for VOC organic waste gas according to embodiment 1 of the present invention.
Wherein, 1-an air inlet fan; 2-electrostatic oil trapping device; 3-a buffer device; 4-a heat exchange device; 5-a first activated carbon adsorption unit; 6-a second activated carbon adsorption device; 7-a first organic waste gas inlet; 8-a first organic waste gas inlet valve; 9-a first heat exchange medium outlet; 10-a first heat exchange medium outlet valve; 11-a first organic waste gas outlet; 12-a first organic waste gas outlet valve; 13-a first heat exchange medium inlet; 14-a first heat exchange medium inlet valve; 15-a second organic waste gas inlet; 16-a second organic waste gas inlet valve; 17-a second heat exchange medium outlet; 18-a second heat exchange medium outlet valve; 19-a second organic waste gas outlet; 20-a second organic waste gas outlet valve; 21-a second heat exchange medium inlet; 22-a second heat exchange medium inlet valve; 23-a condensing unit; 24-a collection device; 25-exhaust fan.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the invention provides an adsorption and desorption treatment system for VOC organic waste gas, which comprises a pretreatment unit, a waste gas heat exchange unit and an activated carbon adsorption unit, which are connected in sequence, as shown in fig. 1.
The pretreatment unit comprises an electrostatic oil catching device 2, and the electrostatic oil catching device 2 is used for removing oil mist and impurities in the VOC organic waste gas.
The waste gas heat exchange unit comprises a heat exchange device 4, a heat exchange medium channel and an organic waste gas channel which are mutually independent are arranged in the heat exchange device 4, the organic waste gas channel is respectively connected with the pretreatment unit and the activated carbon adsorption unit, the organic waste gas channel enters the organic waste gas channel through the pretreatment unit, exchanges heat with the heat exchange medium in the heat exchange medium channel and then enters the activated carbon adsorption unit; the heat exchange medium channel is respectively and independently connected with the activated carbon adsorption device in a circulating manner, the heat exchange medium circularly flows between the heat exchange medium channel and the activated carbon adsorption device, and the heat exchange medium and the VOC organic waste gas are used for desorbing the activated carbon after heat exchange and temperature rise in the heat exchange device 4; the heat exchange medium is nitrogen.
The activated carbon adsorption unit comprises at least two activated carbon adsorption devices (as shown in fig. 1, a first activated carbon adsorption device 5 and a second activated carbon adsorption device 6 which are connected in parallel), wherein one end of each activated carbon adsorption device is provided with an organic waste gas inlet and a heat exchange medium outlet, and the other end of each activated carbon adsorption device is provided with an organic waste gas outlet and a heat exchange medium inlet. The outlet end of the organic waste gas channel is respectively and independently connected with the organic waste gas inlet of the active carbon adsorption device, the inlet end of the heat exchange medium channel is respectively and independently connected with the organic waste gas outlet of the active carbon adsorption device, and the outlet end of the heat exchange medium channel is respectively and independently connected with the organic waste gas inlet of the active carbon adsorption device. And a condensing device 23 is arranged on a connecting pipeline between the inlet end of the heat exchange medium channel and the organic waste gas outlet of the activated carbon adsorption device, and the condensing device 23 is externally connected with a collecting device 24. The organic waste gas inlet pipeline and the organic waste gas outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled adsorption valve, and the heat exchange medium inlet pipeline and the heat exchange medium outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled desorption valve.
A buffer device 3 is also arranged on a connecting pipeline between the electrostatic oil catching device 2 and the heat exchange device 4.
An inlet pipeline of the electrostatic oil catching device 2 is provided with an air inlet fan 1, and an outlet pipeline of the active carbon adsorption unit is provided with an exhaust fan 25.
The adsorption and desorption treatment method specifically comprises the following steps:
in another embodiment, the invention provides a method for adsorbing and desorbing VOC organic waste gas, which includes the steps of performing activated carbon adsorption treatment on the VOC organic waste gas by using an adsorption and desorption treatment system for VOC organic waste gas provided by one embodiment, and then performing high-temperature desorption on activated carbon to realize activated carbon regeneration, wherein the adsorption and desorption treatment method specifically includes the following steps:
VOC organic waste gas enters a heat exchange device 4 after oil mist and impurities in the VOC organic waste gas are removed by an electrostatic oil trapping device 2, and the VOC organic waste gas exchanges heat with a heat exchange medium in a heat exchange medium channel in an organic waste gas channel to reduce the temperature;
(II) introducing the heat-exchanged VOC organic waste gas into a first activated carbon adsorption device 5 to adsorb the VOC organic waste gas, after the adsorption is saturated, opening a heat exchange medium inlet and a heat exchange medium outlet of the first activated carbon adsorption device 5, allowing the heat exchange medium subjected to heat exchange with the VOC organic waste gas and heated to enter the first activated carbon adsorption device 5 to heat and desorb the adsorption-saturated activated carbon, allowing the heat exchange medium subjected to VOC adsorption to enter a condensing device 23, and condensing and collecting the VOC in the condensing device 23; opening an organic waste gas inlet and an organic waste gas outlet of a second activated carbon adsorption device 6 while the first activated carbon adsorption device 5 is desorbing, and introducing the heat-exchanged VOC organic waste gas into the second activated carbon adsorption device 6 for adsorption;
(III) after the second activated carbon adsorption device 6 is saturated, opening a heat exchange medium inlet and a heat exchange medium outlet of the second activated carbon adsorption device 6, allowing the heat exchange medium subjected to heat exchange with the VOC organic waste gas and temperature rise to enter the second activated carbon adsorption device 6 to perform heating desorption on the activated carbon saturated in adsorption, allowing the heat exchange medium adsorbed with the VOC to enter a condensing device 23, and condensing and collecting the VOC in the condensing device 23; the second activated carbon adsorption device 6 is used for desorbing and simultaneously opening an organic waste gas inlet and an organic waste gas outlet of the first activated carbon adsorption device 5, and introducing the heat-exchanged VOC organic waste gas into the first activated carbon adsorption device 5 for adsorption;
and (IV) alternately performing the steps (II) and (III) to continuously adsorb the VOC organic waste gas.
Example 1
This embodiment provides a VOC organic waste gas's absorption desorption processing system, absorption desorption system as shown in figure 1, including the preprocessing unit, waste gas heat transfer unit and the active carbon adsorption unit that connect gradually.
The pretreatment unit comprises an electrostatic oil catching device 2, and the electrostatic oil catching device 2 is used for removing oil mist and impurities in the VOC organic waste gas.
The waste gas heat exchange unit comprises a heat exchange device 4, a heat exchange medium channel and an organic waste gas channel which are mutually independent are arranged inside the heat exchange device 4, the organic waste gas channel is respectively connected with the pretreatment unit and the activated carbon adsorption unit, and the organic waste gas channel enters the organic waste gas channel through the pretreatment unit and enters the activated carbon adsorption unit after exchanging heat with the heat exchange medium in the heat exchange medium channel. The heat exchange medium channel is respectively and independently connected with the activated carbon adsorption device in a circulating way.
The activated carbon adsorption unit comprises a first activated carbon adsorption device 5 and a second activated carbon adsorption device 6 which are connected in parallel. One end of the first activated carbon adsorption device 5 is provided with a first organic waste gas inlet 7 and a first heat exchange medium outlet 9, and the other end is provided with a first organic waste gas outlet 11 and a first heat exchange medium inlet 13; one end of the second activated carbon adsorption device 6 is provided with a second organic waste gas inlet 15 and a second heat exchange medium outlet 17, and the other end is provided with a second organic waste gas outlet 19 and a second heat exchange medium inlet 21.
The outlet ends of the organic waste gas channels of the heat exchange device 4 are respectively and independently connected with a first organic waste gas inlet 7 and a second organic waste gas inlet 15. The inlet end of the heat exchange medium channel of the heat exchange device 4 is respectively and independently connected with the first heat exchange medium outlet 9 and the second heat exchange medium outlet 17, and the outlet end of the heat exchange medium channel is respectively and independently connected with the first heat exchange medium inlet 13 and the second heat exchange medium inlet 21.
A first organic waste gas inlet valve 8 is arranged on the pipeline of the first organic waste gas inlet 7, a first organic waste gas outlet valve 12 is arranged on the pipeline of the first organic waste gas outlet 11, a first heat exchange medium inlet valve 14 is arranged on the pipeline of the first heat exchange medium inlet 13, and a first heat exchange medium outlet valve 10 is arranged on the pipeline of the first heat exchange medium outlet 9. A second organic waste gas inlet valve 16 is arranged on a pipeline of the second organic waste gas inlet 15, a second organic waste gas outlet valve 20 is arranged on a pipeline of the second organic waste gas outlet 19, a second heat exchange medium inlet valve 22 is arranged on a pipeline of the second heat exchange medium inlet 21, and a second heat exchange medium outlet valve 18 is arranged on a pipeline of the second heat exchange medium outlet 17.
The first heat exchange medium outlet 9 pipeline and the second heat exchange medium outlet 17 pipeline are combined into one pipeline and then connected with the inlet end of the heat exchange medium channel, a condensing device 23 is arranged on a connecting pipeline between the combined pipeline and the heat exchange medium channel, the condensing device 23 is externally connected with a collecting device 24, and the first heat exchange medium inlet 13 pipeline and the second heat exchange medium inlet 21 pipeline are combined into one pipeline and then connected with the outlet end of the heat exchange medium channel.
A buffer device 3 is also arranged on a connecting pipeline between the electrostatic oil catching device 2 and the heat exchange device 4.
An inlet pipeline of the electrostatic oil catching device 2 is provided with an air inlet fan 1, and an outlet pipeline of the active carbon adsorption unit is provided with an exhaust fan 25.
Example 2
The adsorption and desorption treatment system provided by the embodiment 1 is adopted to carry out adsorption and desorption treatment on organic waste gas discharged from a certain steel mill, and the benzene content in the discharged organic waste gas is 83mg/m3Toluene content 51mg/m3The xylene content is 80mg/m3。
The adsorption and desorption treatment method specifically comprises the following steps:
(1) the air inlet fan 1 makes the organic waste gas in 10000m3The flow of the VOC organic waste gas is sent into an electrostatic oil catching device 2, oil mist and impurities in the VOC organic waste gas are removed through the electrostatic oil catching device 2 and then enter a heat exchange device 4, the VOC organic waste gas is subjected to heat exchange with nitrogen in a heat exchange medium channel in an organic waste gas channel, the temperature of the VOC organic waste gas is reduced to 150 ℃, and the temperature of the nitrogen is increased to 80 ℃;
(2) opening a first organic waste gas inlet valve 8 and a first organic waste gas outlet valve 12, allowing the heat-exchanged VOC organic waste gas to enter the first active carbon adsorption device 5 through a first organic waste gas inlet 7, penetrating through an active carbon layer filled in the first active carbon adsorption device 5 and then being discharged through a first organic waste gas outlet 11, wherein the packing density of the active carbon filled in the first active carbon adsorption device 5 is 400kg/m3The using amount of the active carbon is 8000 kg;
(3) after the first activated carbon adsorption device 5 is saturated in adsorption, closing the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12, opening the first heat exchange medium inlet valve 14 and the first heat exchange medium outlet valve 10, and discharging nitrogen which is subjected to heat exchange with the VOC organic waste gas and is heated to the first activated carbon adsorption device 5 through the first heat exchange medium inlet 13 to heat and desorb the activated carbon saturated in adsorption and then through the first heat exchange medium outlet 9 to enter the condensing device 23;
(4) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 10 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(5) when the first active carbon adsorption device 5 is used for desorption, the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20 are opened, the VOC organic waste gas after heat exchange enters the second active carbon adsorption device 6 through the second organic waste gas inlet 15, the VOC organic waste gas passes through the active carbon layer filled in the second active carbon adsorption device 6 and is discharged through the second organic waste gas outlet 19, and the stacking density of the active carbon filled in the second active carbon adsorption device 6 is 400kg/m3The using amount of the active carbon is 8000 kg;
(6) after the second activated carbon adsorption device 6 is saturated in adsorption, closing the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20, opening the second heat exchange medium inlet valve 22 and the second heat exchange medium outlet valve 18, feeding the nitrogen subjected to heat exchange with the VOC organic waste gas and temperature rise into the second activated carbon adsorption device 6 through the second heat exchange medium inlet 21, heating and desorbing the activated carbon saturated in adsorption, and discharging the nitrogen into the condensing device 23 through the second heat exchange medium outlet 17;
(7) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 10 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(8) when the second active carbon adsorption device 6 desorbs, the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12 are opened, and the VOC organic waste gas after heat exchange is introduced into the first active carbon adsorption device 5 for adsorption.
(9) And (3) sequentially and circularly performing the steps (2) to (8), continuously adsorbing the VOC organic waste gas, and pumping out the adsorbed organic waste gas through an exhaust fan 25 for discharge.
Sampling and detecting the treated organic waste gas, wherein the detection result is as follows: the benzene content in the organic waste gas is 4.3mg/m3Toluene content of 15mg/m3The xylene content is 36mg/m3。
Example 3
The adsorption and desorption treatment system provided by the embodiment 1 is adopted to carry out adsorption and desorption treatment on organic waste gas discharged from a certain steel mill, and the benzene content in the discharged organic waste gas is 95mg/m3Toluene content 63mg/m3The xylene content is 96mg/m3。
The adsorption and desorption treatment method specifically comprises the following steps:
(1) the air inlet fan 1 leads the organic waste gas to be 13000m3The flow of the VOC organic waste gas is sent into an electrostatic oil catching device 2, oil mist and impurities in the VOC organic waste gas are removed through the electrostatic oil catching device 2 and then enter a heat exchange device 4, the VOC organic waste gas is subjected to heat exchange with nitrogen in a heat exchange medium channel in an organic waste gas channel, the temperature of the VOC organic waste gas is reduced to 158 ℃, and the temperature of the nitrogen is increased to 96 ℃;
(2) opening a first organic waste gas inlet valve 8 and a first organic waste gas outlet valve 12, allowing the heat-exchanged VOC organic waste gas to enter the first active carbon adsorption device 5 through a first organic waste gas inlet 7 and to pass through the first active carbon adsorption device 5The filled active carbon layer is discharged from a first organic waste gas outlet 11, and the bulk density of the active carbon filled in the first active carbon adsorption device 5 is 450kg/m3The dosage of the active carbon is 8300 kg;
(3) after the first activated carbon adsorption device 5 is saturated in adsorption, closing the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12, opening the first heat exchange medium inlet valve 14 and the first heat exchange medium outlet valve 10, and discharging nitrogen which is subjected to heat exchange with the VOC organic waste gas and is heated to the first activated carbon adsorption device 5 through the first heat exchange medium inlet 13 to heat and desorb the activated carbon saturated in adsorption and then through the first heat exchange medium outlet 9 to enter the condensing device 23;
(4) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 15 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(5) when the first active carbon adsorption device 5 is used for desorption, the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20 are opened, the VOC organic waste gas after heat exchange enters the second active carbon adsorption device 6 through the second organic waste gas inlet 15, the VOC organic waste gas passes through the active carbon layer filled in the second active carbon adsorption device 6 and is discharged through the second organic waste gas outlet 19, and the stacking density of the active carbon filled in the second active carbon adsorption device 6 is 450kg/m3The dosage of the active carbon is 8300 kg;
(6) after the second activated carbon adsorption device 6 is saturated in adsorption, closing the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20, opening the second heat exchange medium inlet valve 22 and the second heat exchange medium outlet valve 18, feeding the nitrogen subjected to heat exchange with the VOC organic waste gas and temperature rise into the second activated carbon adsorption device 6 through the second heat exchange medium inlet 21, heating and desorbing the activated carbon saturated in adsorption, and discharging the nitrogen into the condensing device 23 through the second heat exchange medium outlet 17;
(7) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 15 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(8) when the second active carbon adsorption device 6 desorbs, the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12 are opened, and the VOC organic waste gas after heat exchange is introduced into the first active carbon adsorption device 5 for adsorption.
(9) And (3) sequentially and circularly performing the steps (2) to (8), continuously adsorbing the VOC organic waste gas, and pumping out the adsorbed organic waste gas through an exhaust fan 25 for discharge.
Sampling and detecting the treated organic waste gas, wherein the detection result is as follows: the benzene content in the organic waste gas is 5.6mg/m3Toluene content 18mg/m3The xylene content is 42mg/m3。
Example 4
The adsorption and desorption treatment system provided by the embodiment 1 is adopted to carry out adsorption and desorption treatment on organic waste gas discharged from a certain steel mill, and the benzene content in the discharged organic waste gas is 103mg/m3Toluene content of 78mg/m3The xylene content is 105mg/m3。
The adsorption and desorption treatment method specifically comprises the following steps:
(1) the air inlet fan 1 leads the organic waste gas to be 15000m3The flow of the VOC organic waste gas is sent into an electrostatic oil catching device 2, oil mist and impurities in the VOC organic waste gas are removed through the electrostatic oil catching device 2 and then enter a heat exchange device 4, the VOC organic waste gas is subjected to heat exchange with nitrogen in a heat exchange medium channel in an organic waste gas channel, the temperature of the VOC organic waste gas is reduced to 163 ℃, and the temperature of the nitrogen is increased to 106 ℃;
(2) opening a first organic waste gas inlet valve 8 and a first organic waste gas outlet valve 12, allowing the heat-exchanged VOC organic waste gas to enter the first active carbon adsorption device 5 through a first organic waste gas inlet 7, and discharging the heat-exchanged VOC organic waste gas from a first organic waste gas outlet 11 after passing through an active carbon layer filled in the first active carbon adsorption device 5, wherein the packing density of the active carbon filled in the first active carbon adsorption device 5 is 500kg/m38500kg of active carbon;
(3) after the first activated carbon adsorption device 5 is saturated in adsorption, closing the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12, opening the first heat exchange medium inlet valve 14 and the first heat exchange medium outlet valve 10, and discharging nitrogen which is subjected to heat exchange with the VOC organic waste gas and is heated to the first activated carbon adsorption device 5 through the first heat exchange medium inlet 13 to heat and desorb the activated carbon saturated in adsorption and then through the first heat exchange medium outlet 9 to enter the condensing device 23;
(4) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 20 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(5) when the first active carbon adsorption device 5 is used for desorption, the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20 are opened, the VOC organic waste gas after heat exchange enters the second active carbon adsorption device 6 through the second organic waste gas inlet 15, the VOC organic waste gas passes through the active carbon layer filled in the second active carbon adsorption device 6 and is discharged through the second organic waste gas outlet 19, and the stacking density of the active carbon filled in the second active carbon adsorption device 6 is 500kg/m38500kg of active carbon;
(6) after the second activated carbon adsorption device 6 is saturated in adsorption, closing the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20, opening the second heat exchange medium inlet valve 22 and the second heat exchange medium outlet valve 18, feeding the nitrogen subjected to heat exchange with the VOC organic waste gas and temperature rise into the second activated carbon adsorption device 6 through the second heat exchange medium inlet 21, heating and desorbing the activated carbon saturated in adsorption, and discharging the nitrogen into the condensing device 23 through the second heat exchange medium outlet 17;
(7) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 20 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(8) when the second active carbon adsorption device 6 desorbs, the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12 are opened, and the VOC organic waste gas after heat exchange is introduced into the first active carbon adsorption device 5 for adsorption.
(9) And (3) sequentially and circularly performing the steps (2) to (8), continuously adsorbing the VOC organic waste gas, and pumping out the adsorbed organic waste gas through an exhaust fan 25 for discharge.
Sampling and detecting the treated organic waste gas, wherein the detection result is as follows: the benzene content in the organic waste gas is 6.2mg/m3Toluene content 23mg/m3The xylene content is 48mg/m3。
Example 5
Using the teachings provided in example 1The adsorption and desorption treatment system carries out adsorption and desorption treatment on organic waste gas discharged from a certain steel mill, and the benzene content in the discharged organic waste gas is 112mg/m3Toluene content 85mg/m3The xylene content was 113mg/m3。
The adsorption and desorption treatment method specifically comprises the following steps:
(1) the air inlet fan 1 makes organic waste gas 17000m3The flow of the VOC organic waste gas is sent into an electrostatic oil catching device 2, oil mist and impurities in the VOC organic waste gas are removed through the electrostatic oil catching device 2 and then enter a heat exchange device 4, the VOC organic waste gas is subjected to heat exchange with nitrogen in a heat exchange medium channel in an organic waste gas channel, the temperature of the VOC organic waste gas is reduced to 175 ℃, and the temperature of the nitrogen is increased to 115 ℃;
(2) opening a first organic waste gas inlet valve 8 and a first organic waste gas outlet valve 12, allowing the heat-exchanged VOC organic waste gas to enter a first activated carbon adsorption device 5 through a first organic waste gas inlet 7, penetrating through an activated carbon layer filled in the first activated carbon adsorption device 5 and then being discharged through a first organic waste gas outlet 11, wherein the packing density of the activated carbon filled in the first activated carbon adsorption device 5 is 550kg/m3The dosage of the active carbon is 8700 kg;
(3) after the first activated carbon adsorption device 5 is saturated in adsorption, closing the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12, opening the first heat exchange medium inlet valve 14 and the first heat exchange medium outlet valve 10, and discharging nitrogen which is subjected to heat exchange with the VOC organic waste gas and is heated to the first activated carbon adsorption device 5 through the first heat exchange medium inlet 13 to heat and desorb the activated carbon saturated in adsorption and then through the first heat exchange medium outlet 9 to enter the condensing device 23;
(4) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 25 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(5) when the first active carbon adsorption device 5 is in desorption, the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20 are opened, the VOC organic waste gas after heat exchange enters the second active carbon adsorption device 6 through the second organic waste gas inlet 15, the VOC organic waste gas after heat exchange passes through the active carbon layer filled in the second active carbon adsorption device 6 and then is discharged through the second organic waste gas outlet 19, and the second active carbon adsorption deviceThe bulk density of the activated carbon filled in the auxiliary device 6 is 550kg/m3The dosage of the active carbon is 8700 kg;
(6) after the second activated carbon adsorption device 6 is saturated in adsorption, closing the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20, opening the second heat exchange medium inlet valve 22 and the second heat exchange medium outlet valve 18, feeding the nitrogen subjected to heat exchange with the VOC organic waste gas and temperature rise into the second activated carbon adsorption device 6 through the second heat exchange medium inlet 21, heating and desorbing the activated carbon saturated in adsorption, and discharging the nitrogen into the condensing device 23 through the second heat exchange medium outlet 17;
(7) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 25 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(8) when the second active carbon adsorption device 6 desorbs, the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12 are opened, and the VOC organic waste gas after heat exchange is introduced into the first active carbon adsorption device 5 for adsorption.
(9) And (3) sequentially and circularly performing the steps (2) to (8), continuously adsorbing the VOC organic waste gas, and pumping out the adsorbed organic waste gas through an exhaust fan 25 for discharge.
Sampling and detecting the treated organic waste gas, wherein the detection result is as follows: the benzene content in the organic waste gas is 8.5mg/m3Toluene content 25mg/m3The xylene content is 53mg/m3。
Example 6
The adsorption and desorption treatment system provided by the embodiment 1 is adopted to carry out adsorption and desorption treatment on organic waste gas discharged from a certain steel mill, and the benzene content in the discharged organic waste gas is 118mg/m3The toluene content was 96mg/m3The xylene content was 119mg/m3。
The adsorption and desorption treatment method specifically comprises the following steps:
(1) the air inlet fan 1 uses 20000m to make the organic waste gas3The flow of the VOC organic waste gas is sent into an electrostatic oil catching device 2, oil mist and impurities in the oil mist are removed by the electrostatic oil catching device 2 and then enter a heat exchange device 4, and the VOC organic waste gas is in an organic waste gas channel and a heat exchange medium channelThe temperature of the nitrogen is reduced to 180 ℃ through heat exchange, and the temperature of the nitrogen is increased to 120 ℃;
(2) opening a first organic waste gas inlet valve 8 and a first organic waste gas outlet valve 12, allowing the heat-exchanged VOC organic waste gas to enter a first activated carbon adsorption device 5 through a first organic waste gas inlet 7, penetrating an activated carbon layer filled in the first activated carbon adsorption device 5 and then being discharged through a first organic waste gas outlet 11, wherein the packing density of the activated carbon filled in the first activated carbon adsorption device 5 is 600kg/m39000kg of active carbon;
(3) after the first activated carbon adsorption device 5 is saturated in adsorption, closing the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12, opening the first heat exchange medium inlet valve 14 and the first heat exchange medium outlet valve 10, and discharging nitrogen which is subjected to heat exchange with the VOC organic waste gas and is heated to the first activated carbon adsorption device 5 through the first heat exchange medium inlet 13 to heat and desorb the activated carbon saturated in adsorption and then through the first heat exchange medium outlet 9 to enter the condensing device 23;
(4) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 30 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(5) when the first active carbon adsorption device 5 is used for desorption, the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20 are opened, the VOC organic waste gas after heat exchange enters the second active carbon adsorption device 6 through the second organic waste gas inlet 15, the VOC organic waste gas passes through the active carbon layer filled in the second active carbon adsorption device 6 and is discharged through the second organic waste gas outlet 19, and the stacking density of the active carbon filled in the second active carbon adsorption device 6 is 600kg/m39000kg of active carbon;
(6) after the second activated carbon adsorption device 6 is saturated in adsorption, closing the second organic waste gas inlet valve 16 and the second organic waste gas outlet valve 20, opening the second heat exchange medium inlet valve 22 and the second heat exchange medium outlet valve 18, feeding the nitrogen subjected to heat exchange with the VOC organic waste gas and temperature rise into the second activated carbon adsorption device 6 through the second heat exchange medium inlet 21, heating and desorbing the activated carbon saturated in adsorption, and discharging the nitrogen into the condensing device 23 through the second heat exchange medium outlet 17;
(7) the condensing device 23 cools the nitrogen gas adsorbed with the VOC to 30 ℃, and high-boiling-point organic components in the nitrogen gas are condensed and collected to the collecting device 24;
(8) when the second active carbon adsorption device 6 desorbs, the first organic waste gas inlet valve 8 and the first organic waste gas outlet valve 12 are opened, and the VOC organic waste gas after heat exchange is introduced into the first active carbon adsorption device 5 for adsorption.
(9) And (3) sequentially and circularly performing the steps (2) to (8), continuously adsorbing the VOC organic waste gas, and pumping out the adsorbed organic waste gas through an exhaust fan 25 for discharge.
Sampling and detecting the treated organic waste gas, wherein the detection result is as follows: the benzene content in the organic waste gas is 9.8mg/m3Toluene content 28mg/m3The xylene content is 56mg/m3。
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. The adsorption and desorption treatment system for the VOC organic waste gas is characterized by comprising a pretreatment unit, a waste gas heat exchange unit and an active carbon adsorption unit which are sequentially connected;
the pretreatment unit is used for removing oil mist and impurities in VOC organic waste gas, the waste gas heat exchange unit comprises a heat exchange device, the activated carbon adsorption unit comprises at least two activated carbon adsorption devices connected in parallel, and the heat exchange device and the activated carbon adsorption devices are respectively and independently connected in a circulating mode.
2. The adsorption-desorption treatment system according to claim 1, wherein the heat exchange device is internally provided with a heat exchange medium channel and an organic waste gas channel which are independent of each other;
preferably, the organic waste gas channel is respectively connected with the pretreatment unit and the activated carbon adsorption unit, and the organic waste gas channel enters the organic waste gas channel through the pretreatment unit, exchanges heat with the heat exchange medium in the heat exchange medium channel and then enters the activated carbon adsorption unit;
preferably, the heat exchange medium channel is respectively and independently connected with the activated carbon adsorption device in a circulating manner, the heat exchange medium circularly flows between the heat exchange medium channel and the activated carbon adsorption device, and the heat exchange medium and the VOC organic waste gas are used for desorbing the activated carbon after heat exchange and temperature rise in the heat exchange device;
preferably, the heat exchange medium is nitrogen.
3. The adsorption and desorption treatment system according to claim 1 or 2, wherein one end of the activated carbon adsorption device is provided with an organic waste gas inlet and a heat exchange medium outlet, and the other end is provided with an organic waste gas outlet and a heat exchange medium inlet;
preferably, the outlet ends of the organic waste gas channels are respectively and independently connected with an organic waste gas inlet of the activated carbon adsorption device;
preferably, the inlet ends of the heat exchange medium channels are respectively and independently connected with an organic waste gas outlet of the activated carbon adsorption device, and the outlet ends of the heat exchange medium channels are respectively and independently connected with an organic waste gas inlet of the activated carbon adsorption device;
preferably, a condensing device is arranged on a connecting pipeline between the inlet end of the heat exchange medium channel and the organic waste gas outlet of the activated carbon adsorption device;
preferably, the condensing device is externally connected with a collecting device.
4. The adsorption-desorption treatment system according to any one of claims 1 to 3, wherein the organic waste gas inlet pipeline and the organic waste gas outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled adsorption valve;
preferably, the heat exchange medium inlet pipeline and the heat exchange medium outlet pipeline of the activated carbon adsorption device are respectively provided with an independently controlled desorption valve.
5. The adsorption desorption treatment system of any one of claims 1 to 4, wherein the activated carbon adsorption unit comprises a first activated carbon adsorption device and a second activated carbon adsorption device connected in parallel.
6. The adsorption-desorption treatment system according to any one of claims 1 to 5, wherein the pretreatment unit comprises an electrostatic oil trap;
preferably, a buffer device is further disposed on a connection pipeline between the electrostatic oil trapping device and the heat exchange device.
7. The adsorption-desorption treatment system according to any one of claims 1 to 6, further comprising a transfer device provided on an inlet line of the pretreatment unit;
preferably, the conveying device is an air inlet fan;
preferably, an exhaust device is further arranged on the outlet pipeline of the activated carbon adsorption unit;
preferably, the exhaust device is an exhaust fan.
8. An adsorption and desorption treatment method for VOC organic waste gas, which is characterized in that the adsorption and desorption treatment system for VOC organic waste gas of any one of claims 1 to 7 is adopted to carry out activated carbon adsorption treatment on the VOC organic waste gas and then carry out high-temperature desorption on activated carbon to realize activated carbon regeneration, and the adsorption and desorption treatment method comprises the following steps:
the VOC organic waste gas enters a heat exchange device after oil mist and impurities in the VOC organic waste gas are removed through a pretreatment unit, enters an active carbon adsorption device after being subjected to heat exchange and temperature reduction with a heat exchange medium in the heat exchange device, and is introduced into the active carbon adsorption device to desorb active carbon after the heat exchange medium and the VOC organic waste gas are subjected to heat exchange and temperature rise so as to realize active carbon regeneration.
9. The adsorption and desorption treatment method according to claim 8, specifically comprising the steps of:
removing oil mist and impurities in the VOC organic waste gas by an electrostatic oil trapping device, and then feeding the VOC organic waste gas into a heat exchange device, wherein the VOC organic waste gas exchanges heat with a heat exchange medium in a heat exchange medium channel in an organic waste gas channel to reduce the temperature;
(II) introducing the heat-exchanged VOC organic waste gas into a first activated carbon adsorption device to adsorb the VOC organic waste gas, after the VOC organic waste gas is saturated in adsorption, opening a heat exchange medium inlet and a heat exchange medium outlet of the first activated carbon adsorption device, allowing the heat exchange medium subjected to heat exchange with the VOC organic waste gas and heated to enter the first activated carbon adsorption device to heat and desorb the activated carbon subjected to saturated adsorption, allowing the heat exchange medium subjected to VOC adsorption to enter a condensing device, and condensing and collecting the VOC in the condensing device; opening an organic waste gas inlet and an organic waste gas outlet of a second activated carbon adsorption device while the first activated carbon adsorption device is desorbing, and introducing the heat-exchanged VOC organic waste gas into the second activated carbon adsorption device for adsorption;
(III) after the second activated carbon adsorption device is saturated in adsorption, opening a heat exchange medium inlet and a heat exchange medium outlet of the second activated carbon adsorption device, allowing a heat exchange medium subjected to heat exchange with the VOC organic waste gas and temperature rise to enter the second activated carbon adsorption device to perform heating desorption on the activated carbon saturated in adsorption, allowing the heat exchange medium adsorbed with the VOC to enter a condensing device, and condensing and collecting the VOC in the condensing device; opening an organic waste gas inlet and an organic waste gas outlet of the first activated carbon adsorption device while the second activated carbon adsorption device is desorbing, and introducing the heat-exchanged VOC organic waste gas into the first activated carbon adsorption device for adsorption;
and (IV) alternately performing the steps (II) and (III) to continuously adsorb the VOC organic waste gas.
10. The adsorption and desorption treatment method according to claim 9, wherein the volatile organic compounds in the VOC organic waste gas of step (i) include one or a combination of at least two of benzene, toluene or xylene;
preferably, the benzene content in the VOC organic waste gas is 80-120 mg/m3；
Preference is given toThe content of toluene in the VOC organic waste gas is 50-100 mg/m3；
Preferably, the content of xylene in the VOC organic waste gas is 80-120 mg/m3；
Preferably, the flow of the VOC organic waste gas is 10000-20000 m3/h；
Preferably, the VOC organic waste gas and a heat exchange medium exchange heat and are cooled to 150-180 ℃;
preferably, the heat exchange medium is nitrogen;
preferably, the first activated carbon adsorption device and the second activated carbon adsorption device in the step (II) and the step (III) are filled with activated carbon;
preferably, the bulk density of the activated carbon is 400-600 kg/m 3;
preferably, the using amount of the activated carbon is 8000-9000 kg;
preferably, the heat exchange medium and the VOC organic waste gas exchange heat and rise to 80-120 ℃;
preferably, the condensing device condenses the heat exchange medium adsorbed with the VOC to 10-30 ℃;
preferably, the benzene content in the VOC organic waste gas after the activated carbon adsorption in the step (IV) is less than or equal to 10mg/m3；
Preferably, the content of toluene in the VOC organic waste gas after the adsorption of the activated carbon is less than or equal to 30mg/m3；
Preferably, the content of dimethylbenzene in the VOC organic waste gas after the adsorption of the activated carbon is less than or equal to 60mg/m3。
CN201911281416.4A 2019-12-13 2019-12-13 VOC organic waste gas adsorption and desorption treatment system and treatment method Pending CN110787589A (en)

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CN105214439A (en) * 2015-09-14 2016-01-06 清本环保工程(杭州)有限公司 Oil-gas recovery processing device and method
CN105381682A (en) * 2015-11-16 2016-03-09 中冶南方工程技术有限公司 VOC waste gas purification and recycle system
CN205323477U (en) * 2015-12-28 2016-06-22 嘉园环保有限公司 Organic solvent's device is retrieved to energy -conserving nitrogen gas desorption
CN205598887U (en) * 2016-04-13 2016-09-28 沈阳环境科学研究院 Multicomponent VOCs adsorbs condensation recovery device
CN207722566U (en) * 2017-12-26 2018-08-14 广州市怡森环保设备有限公司 A kind of movable type organic exhaust gas nitrogen desorption purifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533313A1 (en) * 1984-09-27 1986-05-28 HKN Lösungsmittelrückgewinnungsanlagen GmbH, 5010 Bergheim Process and apparatus for separating off and recovering volatile solvents
CN105214439A (en) * 2015-09-14 2016-01-06 清本环保工程(杭州)有限公司 Oil-gas recovery processing device and method
CN105381682A (en) * 2015-11-16 2016-03-09 中冶南方工程技术有限公司 VOC waste gas purification and recycle system
CN205323477U (en) * 2015-12-28 2016-06-22 嘉园环保有限公司 Organic solvent's device is retrieved to energy -conserving nitrogen gas desorption
CN205598887U (en) * 2016-04-13 2016-09-28 沈阳环境科学研究院 Multicomponent VOCs adsorbs condensation recovery device
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Application publication date: 20200214