CN110813052A - Comprehensive treatment system and treatment method for VOC (volatile organic compound) organic waste gas - Google Patents
Comprehensive treatment system and treatment method for VOC (volatile organic compound) organic waste gas Download PDFInfo
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- CN110813052A CN110813052A CN201911280829.0A CN201911280829A CN110813052A CN 110813052 A CN110813052 A CN 110813052A CN 201911280829 A CN201911280829 A CN 201911280829A CN 110813052 A CN110813052 A CN 110813052A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- 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
- B01D53/34—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
- 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
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/818—Employing electrical discharges or the generation of a plasma
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
The invention provides a comprehensive treatment system and a treatment method of VOC (volatile organic compounds) organic waste gas, wherein the comprehensive treatment system comprises a heat exchange device, an electron emission device, a spraying device and a photocatalysis device which are sequentially connected; the electron emission device comprises an electrostatic shielding tube and an electron beam emission source arranged at one end of the electrostatic shielding tube, organic waste gas is introduced into the electrostatic shielding tube, and the electron beam emission source emits high-energy electron beams to the organic waste gas; the inside active carbon bed layer and the ultraviolet banks of having set gradually from top to bottom of photocatalysis device. The comprehensive treatment system provided by the invention combines various treatment processes such as electron beam radiation treatment, spray absorption treatment, photocatalytic treatment, activated carbon adsorption treatment and the like to realize comprehensive treatment on the organic waste gas, and the treatment process in the former stage provides necessary temperature and humidity conditions for the organic waste gas in the latter stage.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, relates to a comprehensive treatment system and a treatment method for VOC (volatile organic compounds) organic waste gas, and particularly relates to a comprehensive treatment system and a treatment method for VOC organic waste gas by electron beam radiation in cooperation with photocatalysis.
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 atmosphere has the following effects that ① VOCs are precursors of photochemical reaction, when irradiated by sunlight, under proper conditions, VOCs and NOx and other suspended chemical substances generate a series of photochemical reaction, ozone is mainly generated, photochemical smog is formed, photochemical pollution is generated, ② photochemical smog stimulates eyes and respiratory system of people, some VOCs also have strong stimulating smell, uncomfortable feeling is generated when certain concentration in the air is reached, the quality of the air is affected, ③ some toxic VOCs (such as aromatic hydrocarbon and the like) gas exist in the environment and can damage the health of people, the toxic VOCs gas can cause canceration or cause other serious diseases in the polluted air, such as benzene damages the hematopoietic function of bone marrow, a strong anesthetic effect on VOCs, and toluene has a strong carcinogenic effect on VOCs in the environment.
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.
CN207430015U discloses an integrated VOC waste gas treatment system based on photocatalysis and membrane separation technology, which comprises a primary spray box, wherein the top of the primary spray box is provided with a VOC waste gas inlet, a primary spray pipe is arranged in the primary spray box, and the primary spray pipe is connected with a spray liquid circulating device; the bottom of the primary spraying box is provided with a separation filter, and the bottom of the primary spraying box is provided with a biological purification water tank; a primary filtering device is arranged on the side surface of the primary spraying box and positioned at the top of the biological purification water tank, and the primary filtering device is connected with a secondary spraying device through a first pipeline; the secondary spraying device is connected with the membrane separation device through a second pipeline; and a first outlet of the membrane separation device is connected with the photocatalytic device through a third pipeline, and a second outlet of the membrane separation device is connected with the first pipeline through a circulating pipeline.
CN109126383A discloses a VOC waste gas purification all-in-one, including the concentrated system of VOC, it possesses the catalytic combustor, heat exchanger, the regeneration fan, a heat exchanger, the chimney, the concentrated runner of VOC, the processing fan, still include the spray column, the photocatalysis unit, the dust removal unit, VOC waste gas passes through the dust removal unit through the pipeline in proper order, the spray column, photocatalysis unit and the concentrated system of VOC, wherein supreme humidification processing chamber and the secondary dust removal chamber of being equipped with in proper order below in the spray column, the filter screen layer is established to secondary dust removal chamber top, VOC waste gas gets into from spray column bottom air inlet, flow out through the pipeline from the top gas outlet and get into the photocatalysis unit, and establish the valve on the pipeline, establish the detector on the valve, two exports lead to the spray column air inlet respectively on the valve, the.
CN206168222U discloses a VOC treatment facility, including spray column and the photocatalysis tower that sets gradually, the bottom of spray column is provided with VOC waste gas entry, and the top that VOC waste gas entered the mouth is provided with sprays the packing layer, and the top that sprays the packing layer is provided with the shower head, and VOC waste gas entry and the top that sprays are provided with the bubble shower nozzle between the packing layer are provided with the gas outlet that sprays, the top of spray column is provided with the catalysis waste gas entry, is provided with ultraviolet lamp and active carbon filtering layer in the photocatalysis tower, and the active carbon filtering layer is located the top that catalyzes the waste gas entry, and the ultraviolet lamp sets up between catalysis waste gas entry and active carbon filtering layer, and the top of photocatalysis tower is provided with the gas vent, sprays the gas outlet and catalyzes waste gas.
At present to VOC organic waste gas's comprehensive treatment scheme diversified, but running cost and treatment cost are higher on the one hand, and system architecture is complicated, complex operation, and on the other hand, relatively poor to the higher organic waste gas treatment effect of VOC concentration, life cycle is shorter. There is therefore a need for improvements in existing integrated processing systems to address the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a comprehensive 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 a comprehensive treatment system for VOC organic waste gas, which comprises a heat exchange device, an electron emission device, a spraying device and a photocatalysis device which are connected in sequence.
The electron emission device comprises an electrostatic shielding tube and an electron beam emission source arranged at one end of the electrostatic shielding tube, organic waste gas is introduced into the electrostatic shielding tube, and the electron beam emission source emits high-energy electron beams to the organic waste gas.
The inside active carbon bed layer and the ultraviolet banks of having set gradually from top to bottom of photocatalysis device.
The comprehensive treatment system provided by the invention combines various treatment processes such as electron beam radiation treatment, spray absorption treatment, photocatalytic treatment, activated carbon adsorption treatment and the like to realize comprehensive treatment on the organic waste gas, and the treatment process in the former stage provides necessary temperature and humidity conditions for the organic waste gas in the latter stage.
As a preferred technical solution of the present invention, a cooling device is disposed on the connection pipeline between the heat exchange device and the electron emission device.
Preferably, the cooling device is a cold trap.
In the invention, the cold trap removes high-boiling-point and high-concentration organic matters in the organic waste gas, reduces the total amount of VOC to be treated, reduces the operating pressure of equipment and shortens the operating period.
As a preferred technical solution of the present invention, the cooling device is connected to the electron emission device through a mixing pipe.
Preferably, the outlet end of the mixing pipe is positioned inside the electron emission device.
Preferably, the outlet end of the mixing pipeline is provided with a nozzle.
Preferably, along the flow direction of the organic waste gas, a steam conveying device and a detection assembly are sequentially connected to the mixing pipeline, and the steam conveying device is used for spraying mixed steam into the pipeline.
Preferably, the mixed steam comprises hydrogen peroxide steam and water vapor.
Preferably, the detection assembly comprises a temperature detection module and a humidity detection module.
In the invention, the electron beam with high energy can quickly and effectively react with hydrogen peroxide vapor and water vapor, the water vapor and the hydrogen peroxide vapor generate free radicals with strong oxidizing property such as hydroxyl free radicals, oxygen free radicals and the like and ozone under the bombardment of electrons, and VOC in the organic waste gas is oxidized into H by the substances with strong oxidizing property2O and CO2. The electrostatic shielding tube ensures that the transmission direction of the electron beam does not deviate, so that electrons can smoothly evaporate with waterThe gas contacts with the hydrogen peroxide vapor.
As a preferred technical solution of the present invention, the integrated processing system further comprises a control device, and the control device is electrically connected to the temperature detection module and the humidity detection module independently.
Preferably, the control device is respectively and independently connected with the cooling device and the steam conveying device in a feedback manner, the control device is used for receiving temperature detection data sent by the temperature detection module and controlling the flow rate of a cooling medium of the cooling device, and the control device is used for receiving humidity detection data sent by the humidity detection module and controlling the flow rate of mixed steam conveyed by the steam conveying device.
As a preferable technical solution of the present invention, the spray device is internally filled with a spray liquid.
Preferably, the spraying device comprises a shell and a spraying liquid circulating pipeline externally connected with the bottom of the shell, and the outlet end of the spraying liquid circulating pipeline is positioned inside the shell.
Preferably, the outlet end of the spray liquid circulating pipeline is provided with a spray head.
Preferably, a circulating pump is arranged on the spraying liquid circulating pipeline.
Preferably, a defogging device is further arranged inside the shell, and the defogging device is positioned above the spraying device.
As a preferable technical scheme of the invention, the heat exchange device is circularly connected with the photocatalysis device.
Preferably, 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 heat exchange medium channel is circularly connected with the photocatalytic device, the heat exchange medium circularly flows between the heat exchange medium channel and the photocatalytic device, and the heat exchange medium and the organic waste gas are used for desorbing the activated carbon filled in the photocatalytic device after heat exchange and temperature rise in the heat exchange device.
Preferably, the heat exchange medium is nitrogen.
As a preferable technical scheme of the invention, the top of the photocatalytic device is provided with a heat exchange medium outlet and an organic waste gas outlet, and the bottom of the photocatalytic device is provided with a heat exchange medium inlet.
Preferably, the heat exchange medium inlet of the photocatalytic device is connected with the outlet end of the heat exchange medium channel through a heat exchange medium outlet.
Preferably, the outlet of the heat exchange medium of the photocatalytic device is connected with the inlet end of the heat exchange medium channel through a heat exchange medium loop.
Preferably, the heat exchange medium outlet and the heat exchange medium loop are both provided with flow valves.
Preferably, a condensing device is further arranged on the heat exchange medium loop.
Preferably, the condensing device is externally connected with a collecting device.
Preferably, an organic waste gas outlet of the photocatalytic device is connected with an exhaust fan.
As a preferred technical solution of the present invention, the ultraviolet lamp set includes at least two ultraviolet lamps disposed on an inner wall of a housing of the photocatalytic device.
Preferably, 6 to 12 uv lamps are equally spaced along the circumference of the housing of the photocatalytic device, for example, 6, 7, 8, 9, 10, 11 or 12 uv lamps, but not limited to the values listed, and other values not listed in the range of values are also applicable.
In a second aspect, the present invention provides a comprehensive treatment method for VOC organic waste gas, wherein the comprehensive treatment system of the first aspect is used to perform comprehensive treatment on the VOC organic waste gas, and the comprehensive treatment method comprises:
the method comprises the following steps that (I) organic waste gas is subjected to heat exchange with a heat exchange medium in a heat exchange device and then enters an electron emission device, and the electron emission device emits high-energy electron beams to oxidize VOC in the organic waste gas;
(II) introducing the oxidized organic waste gas into a spraying device for circulating spraying;
(III) introducing the organic waste gas after spraying treatment into a photocatalysis device, and carrying out photocatalysis on VOC (volatile organic compounds) in the organic waste gas under the excitation of ultraviolet lightChemical reaction to produce CO2And H2And O, and then, the organic waste gas passes through the activated carbon bed layer to further adsorb residual VOC and then is discharged.
As a preferred technical scheme of the invention, the step (I) specifically comprises the following steps:
(1) the organic waste gas enters a cooling device after heat exchange, and enters a mixing pipeline after being cooled;
(2) the steam conveying device sprays mixed steam into the mixing pipeline, the mixed steam and the organic waste gas are mixed to form mixed gas, the detection assembly detects the temperature and the humidity of the mixed gas, the detection result is fed back to the control device, and the control device adjusts the coolant flow of the cooling device and the mixed steam sprayed by the steam conveying device according to the detection result;
(3) and the mixed gas with the standard detection result enters the electrostatic shielding tube, the electron beam emission source emits high-energy electron beams, the mixed steam generates oxidizing substances under the bombardment of the electron beams, and harmful substances in the organic waste gas are removed by the oxidation of the oxidizing substances.
Preferably, the flow rate of the organic waste gas in the step (1) 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 organic waste gas exchanges heat with a heat exchange medium in the heat exchange device.
Preferably, the temperature of the organic waste gas is reduced to 150-180 ℃ by heat exchange with a heat exchange medium, for example, 150 ℃, 155 ℃, 160 ℃, 165 ℃, 170 ℃, 175 ℃ or 180 ℃, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the heat exchange medium and the organic waste gas are heated to 80-120 ℃ through heat exchange, for example, 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃ or 120 ℃, but the heat exchange medium is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the mixed steam in the step (2) comprises hydrogen peroxide steam and water vapor.
Preferably, the volume content of the hydrogen peroxide vapor in the mixed vapor is 30-50%, for example, 30%, 32%, 34%, 35%, 38%, 40%, 42%, 44%, 46%, 48% or 50%, but not limited to the listed values, and other values not listed in the range of the values are also applicable.
Preferably, the control process of the control device in step (2) includes independent logic control of the temperature of the mixed gas and independent logic control of the humidity of the mixed gas.
Preferably, the process of the control device performing the independent logic control on the temperature of the mixed gas comprises:
the temperature detection module carries out real-time detection to the temperature of mist and sends measured temperature data to controlling means, and controlling means receives after the measured temperature data and predetermines the temperature range and carries out the comparison, does not carry out any operation if the measured temperature is in predetermineeing the temperature range, if the measured temperature is less than the minimum of predetermineeing the temperature range then control cooling device improves coolant flow, if the measured temperature is higher than the maximum of predetermineeing the temperature range then control cooling device and reduce coolant flow.
Preferably, the predetermined temperature range is 0 to 30 ℃, for example, 2 ℃, 4 ℃, 6 ℃, 8 ℃, 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 are also applicable.
Preferably, the process of the control device performing the independent logic control on the humidity of the mixed gas comprises the following steps:
humidity detection module carries out real-time detection to mist's humidity and sends actual measurement humidity data to controlling means, controlling means receives actual measurement humidity data back and compares with predetermineeing the humidity range, if actual measurement humidity does not then carry out any operation at predetermineeing the humidity range, if actual measurement humidity is less than the minimum of predetermineeing the humidity range then control steam conveyor improves the mist flow of output, if actual measurement humidity is higher than the maximum of predetermineeing the humidity range then control steam conveyor reduces the mist flow of output.
Preferably, the predetermined humidity range is 40-70%, such as 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68% or 70%, but not limited to the recited values, and other values in the recited range are also applicable.
Preferably, the oxidizing substance of step (3) comprises oxidizing radicals and ozone.
Preferably, the oxidative radicals include hydroxyl radicals and oxygen radicals.
Preferably, the spraying liquid stored in the spraying device in the step (ii) is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol.
In the invention, the sodium citrate is ionic surface active and has both hydrophilic groups (easy to combine with water) and lipophilic groups (easy to combine with organic molecules), so that the aqueous solution of the sodium citrate has better absorption on VOC in the tail gas. Polyethylene glycol has a significant effect on the surface tension, emulsification and solubilization of the surfactant solution. Therefore, the invention adopts the method that the polyethylene glycol is added into the sodium citrate absorbent, so that the surface tension of the absorbent can be obviously reduced, and the VOC removal rate is increased. Wherein, the free energy which is easy to spontaneously proceed in the process of the alcohol molecules participating in the formation of the surfactant micelle is reduced, and the existence of the alcohol in the solution enables the micelle to be easily formed, thereby increasing the absorption capacity. Sodium carbonate can reduce the repulsion between the sodium citrate ion heads, thereby making the surfactant more readily adsorbed on the surface and forming micelles, resulting in a reduction in the surface tension of the solution and an increase in the absorption capacity, thereby further improving the VOC removal rate. The sodium chloride with the effect of improving the activity of the surfactant sodium citrate is also added into the formula, so that the VOC removal rate is further improved.
Preferably, the sodium citrate is present in the spray solution in a mass fraction of 5 to 10%, for example 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5%, 8.0%, 8.5%, 9.0%, 9.5% or 10.0%, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the sodium carbonate is present in the spray solution in a mass fraction of 5 to 10%, for example 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5%, 8.0%, 8.5%, 9.0%, 9.5% or 10.0%, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the mass fraction of the polyethylene glycol in the spray solution is 1-5%, for example, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5% or 5.0%, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the wavelength of the ultraviolet light emitted by the ultraviolet lamp set in step (III) is 180-260 nm, such as 180nm, 185nm, 190nm, 195nm, 200nm, 205nm, 210nm, 215nm, 220nm, 225nm, 230nm, 235nm, 240nm, 245nm, 250nm, 255nm or 260nm, but is not limited to the recited values, and other values in the range of the recited values are also applicable.
Preferably, step (iii) further comprises: after organic waste gas discharges the photocatalysis device, the heat transfer medium after the heat transfer intensifies in step (I) lets in photocatalysis device, and the VOC in the adsorption activated carbon bed layer realizes that the active carbon is regenerated, has adsorbed VOC's heat transfer medium and has discharged and get into condensing equipment, collects behind the high boiling point VOC condensation in the heat transfer medium and gets into collection device, and the heat transfer medium after the condensation gets into heat transfer device and repeats step (I).
Preferably, the condensing device cools the heat exchange medium having adsorbed the VOC to 10 to 30 ℃, for example, 10 ℃, 11 ℃, 12 ℃, 13 ℃, 14 ℃, 15 ℃, 16 ℃, 17 ℃, 18 ℃, 19 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃, 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃ or 30 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the invention has the beneficial effects that:
the comprehensive treatment system provided by the invention combines various treatment processes such as electron beam radiation treatment, spray absorption treatment, photocatalytic treatment, activated carbon adsorption treatment and the like to realize comprehensive treatment on the organic waste gas, and the treatment process in the former stage provides necessary temperature and humidity conditions for the organic waste gas in the latter stage.
Drawings
Fig. 1 is a schematic structural diagram of an integrated VOC organic waste gas treatment system according to an embodiment of the present invention.
Wherein, 1-a heat exchange device; 2-a cooling device; 3-a mixing line; 4-a steam delivery device; 5-a temperature detection module; 6-a humidity detection module; 7-electron beam emitting means; 8-electrostatic shielding tube; 9-an electron beam emission source; 10-a nozzle; 11-a spraying device; 12-a demisting device; 13-a spray liquid circulation pipeline; 14-a circulation pump; 15-a spray header; 16-a photocatalytic device; 17-ultraviolet lamp group; 18-activated carbon bed layer; 19-heat exchange medium outlet; 20-a heat exchange medium loop; 21-outlet valve; 22-a loop 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.
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 one embodiment, the invention provides an integrated treatment system for VOC organic waste gas, which is shown in fig. 1 and comprises a heat exchange device 1, an electron emission device 7, a spraying device 11 and a photocatalytic device 16, which are connected in sequence.
A cooling device 2 is arranged on a connecting pipeline between the heat exchange device 1 and the electron emission device 7, and optionally, the cooling device 2 is a cold trap. The cooling device 2 is connected with the electron emission device 7 through the mixing pipeline 3, the outlet end of the mixing pipeline 3 is positioned inside the electron emission device 7, and the outlet end of the mixing pipeline 3 is provided with a nozzle 10. Along the organic waste gas flow direction, insert steam conveyor 4 and determine module in proper order on the hybrid line 3, steam conveyor 4 is arranged in spouting the mist into the pipeline, and the mist includes hydrogen peroxide solution steam and vapor. The detection assembly comprises a temperature detection module 5 and a humidity detection module 6.
The comprehensive treatment system further comprises a control device, the control device is respectively and independently electrically connected with the temperature detection module 5 and the humidity detection module 6, the control device is respectively and independently connected with the cooling device 2 and the steam conveying device 4 in a feedback mode, the control device is used for receiving temperature detection data sent by the temperature detection module 5 and controlling the flow of cooling media of the cooling device 2, and the control device is used for receiving humidity detection data sent by the humidity detection device and controlling the flow of mixed steam conveyed by the steam conveying device 4.
The electron emission device 7 comprises an electrostatic shielding tube 8 and an electron beam emission source 9 arranged at one end of the electrostatic shielding tube 8, organic waste gas is introduced into the electrostatic shielding tube 8, and the electron beam emission source 9 emits high-energy electron beams to the organic waste gas.
The inside of the photocatalytic device 16 is sequentially provided with an activated carbon bed layer 18 and an ultraviolet lamp set 17 from top to bottom. The ultraviolet lamp set 17 comprises at least two ultraviolet lamps arranged on the inner wall of the shell of the photocatalytic device 16, and 6-12 ultraviolet lamps are arranged along the periphery of the shell of the photocatalytic device 16 at equal intervals.
The spray device 11 is filled with a spray liquid. The spraying device 11 comprises a shell and a spraying liquid circulating pipeline 13 externally connected with the bottom of the shell. The outlet end of the spray liquid circulating pipeline 13 is positioned in the shell, the outlet end of the spray liquid circulating pipeline 13 is provided with a spray head 15, and the spray liquid circulating pipeline 13 is provided with a circulating pump 14. A demisting device 12 is further arranged in the shell, and the demisting device 12 is positioned above the spraying device 11.
The heat exchange device 1 is circularly connected with the photocatalytic device 16, and a heat exchange medium channel and an organic waste gas channel which are mutually independent are arranged in the heat exchange device 1. The heat exchange medium channel is circularly connected with the photocatalytic device 16, the heat exchange medium circularly flows between the heat exchange medium channel and the photocatalytic device 16, and the heat exchange medium and the organic waste gas are used for desorbing the activated carbon filled in the photocatalytic device 16 after heat exchange and temperature rise in the heat exchange device 1. Optionally, the heat exchange medium is nitrogen. The top of the photocatalytic device 16 is provided with a heat exchange medium outlet and an organic waste gas outlet, and the bottom of the photocatalytic device 16 is provided with a heat exchange medium inlet. The inlet of the heat exchange medium of the photocatalytic device 16 is connected with the outlet end of the heat exchange medium channel through a heat exchange medium outlet 19. The outlet of the heat exchange medium of the photocatalytic device 16 is connected to the inlet end of the heat exchange medium channel through a heat exchange medium loop 20. An outlet valve 21 is provided on the heat exchange medium outlet 19, and a circuit valve 22 is provided on the heat exchange medium circuit 20. The heat exchange medium loop 20 is also provided with a condensing device 23, and the condensing device 23 is externally connected with a collecting device 24. The organic waste gas outlet of the photocatalytic device 16 is connected with an exhaust fan 25.
In another embodiment, the present invention provides a comprehensive treatment method for VOC organic waste gas, which uses the comprehensive treatment system provided in the embodiment to perform comprehensive treatment on the VOC organic waste gas, and the comprehensive treatment method comprises:
(1) the organic waste gas exchanges heat with a heat exchange medium in the heat exchange device 1 and then enters the cooling device 2, and the cooled organic waste gas enters the mixing pipeline 3;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam and the organic waste gas are mixed to form mixed gas, the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, the control device receives the temperature detection data and compares the temperature detection data with preset temperature, and the coolant flow in the cooling device 2 is logically controlled according to the comparison condition; the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the control device receives the humidity detection data and compares the humidity detection data with preset humidity, and the flow of the mixed steam conveyed by the steam conveying device 4 is logically controlled according to the comparison condition;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, VOC in the organic waste gas is subjected to photocatalysis reaction under the excitation of ultraviolet light to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, the heat exchange medium subjected to heat exchange and temperature rise in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium adsorbed with the VOC is discharged to enter the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed and then collected to enter the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
Example 1
Adopt the comprehensive treatment system provided by the specific implementation mode to a certain steel millCarrying out comprehensive treatment on the discharged VOC organic waste gas, wherein the benzene content in the discharged organic waste gas is 90mg/m3Toluene content 58mg/m3The xylene content is 84mg/m3。
The comprehensive treatment method comprises the following steps:
(1) the organic waste gas is 10000m3The flow of the gas/h enters a heat exchange device 1, the gas is subjected to heat exchange with nitrogen in the heat exchange device 1 and is cooled to 150 ℃, the gas enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; the nitrogen exchanges heat with the organic waste gas in the heat exchange device 1 and is heated to 80 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 30%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 5%, the mass fraction of the sodium carbonate in the spraying liquid is 5%, and the mass fraction of the polyethylene glycol in the spraying liquid is 1%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, an ultraviolet lamp group 17 comprises 6 ultraviolet lamps which are equidistantly arranged on the inner wall of a shell of the photocatalysis device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled to be 180nm, and VOC in the organic waste gas is excited by the ultraviolet light to carry out photocatalytic reaction to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 80 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed to 10 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 3.5mg/m3Toluene content 1.3mg/m3The xylene content is 2.6mg/m3。
Example 2
The comprehensive treatment system provided by the specific embodiment is adopted to comprehensively treat VOC organic waste gas discharged by a certain steel mill, and the benzene content in the discharged organic waste gas is 95mg/m3Toluene content 63mg/m3The xylene content is 86mg/m3。
The comprehensive treatment method comprises the following steps:
(1) organic waste gas 12000m3The flow of the gas/h enters a heat exchange device 1, the gas is subjected to heat exchange with nitrogen in the heat exchange device 1 and is cooled to 155 ℃, the gas enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; nitrogen gasHeat exchange is carried out between the waste gas and the organic waste gas in the heat exchange device 1, and the temperature is raised to 88 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 34%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 6%, the mass fraction of the sodium carbonate in the spraying liquid is 6%, and the mass fraction of the polyethylene glycol in the spraying liquid is 1.8%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, and an ultraviolet lamp group 17 comprisesThe 7 ultraviolet lamps are equidistantly arranged on the inner wall of the shell of the photocatalytic device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled to be 196nm, and VOC in organic waste gas is subjected to photocatalytic reaction under the excitation of the ultraviolet light to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 88 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed to 15 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 4.2mg/m3Toluene content 1.5mg/m3The xylene content is 2.8mg/m3。
Example 3
The comprehensive treatment system provided by the specific embodiment is adopted to comprehensively treat VOC organic waste gas discharged by a certain steel mill, and the benzene content in the discharged organic waste gas is 103mg/m3Toluene content of 74mg/m3The xylene content is 95mg/m3。
The comprehensive treatment method comprises the following steps:
(1) organic waste gas 14000m3The flow of the gas/h enters a heat exchange device 1, the gas is subjected to heat exchange with nitrogen in the heat exchange device 1 and cooled to 160 ℃, and then enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; the nitrogen exchanges heat with the organic waste gas in the heat exchange device 1 and is heated to 96 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 38%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 7%, the mass fraction of the sodium carbonate in the spraying liquid is 7%, and the mass fraction of the polyethylene glycol in the spraying liquid is 2.6%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, an ultraviolet lamp group 17 comprises 8 ultraviolet lamps which are equidistantly arranged on the inner wall of a shell of the photocatalysis device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled at 212nm, and VOC in the organic waste gas is excited by the ultraviolet light to carry out photocatalytic reaction to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 96 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed to 20 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 5.2mg/m3The toluene content was 2.1mg/m3The xylene content is 3.2mg/m3。
Example 4
The comprehensive treatment system provided by the specific embodiment is adopted to comprehensively treat VOC organic waste gas discharged by a certain steel mill, and the benzene content in the discharged organic waste gas is 115mg/m3Toluene content of 86mg/m3The xylene content is 105mg/m3。
The comprehensive treatment method comprises the following steps:
(1) organic waste gas at 15000m3The flow of the gas/h enters a heat exchange device 1, the gas is subjected to heat exchange with nitrogen in the heat exchange device 1 and cooled to 165 ℃ and then enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; the nitrogen exchanges heat with the organic waste gas in the heat exchange device 1 and is heated to 104 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 42%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 8%, the mass fraction of the sodium carbonate in the spraying liquid is 8%, and the mass fraction of the polyethylene glycol in the spraying liquid is 3.4%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, an ultraviolet lamp group 17 comprises 10 ultraviolet lamps which are equidistantly arranged on the inner wall of a shell of the photocatalysis device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled to be 228nm, and VOC in the organic waste gas is excited by the ultraviolet light to carry out photocatalytic reaction to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 104 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed to 22 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 5.7mg/m3The toluene content was 2.5mg/m3The xylene content is 4mg/m3。
Example 5
The comprehensive treatment system provided by the specific embodiment is adopted to comprehensively treat VOC organic waste gas discharged by a certain steel mill, and the benzene content in the discharged organic waste gas is 128mg/m3Toluene content 95mg/m3The xylene content is 116mg/m3。
The comprehensive treatment method comprises the following steps:
(1) the organic waste gas is 18000m3The flow of the gas/h enters a heat exchange device 1, the gas is subjected to heat exchange with nitrogen in the heat exchange device 1 and cooled to 170 ℃, and then enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; the nitrogen exchanges heat with the organic waste gas in the heat exchange device 1 and is heated to 112 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 46%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 9%, the mass fraction of the sodium carbonate in the spraying liquid is 9%, and the mass fraction of the polyethylene glycol in the spraying liquid is 4.2%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, an ultraviolet lamp group 17 comprises 11 ultraviolet lamps which are equidistantly arranged on the inner wall of a shell of the photocatalysis device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled to be 244nm, and VOC in the organic waste gas is excited by the ultraviolet light to carry out photocatalytic reaction to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 112 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the VOC with a high boiling point in the heat exchange medium is condensed to 26 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 6mg/m3The toluene content was 2.8mg/m3The xylene content is 4.3mg/m3。
Example 6
The comprehensive treatment system provided by the specific embodiment is adopted to comprehensively treat the VOC organic waste gas discharged by a certain steel mill, and the benzene content in the discharged organic waste gas is 146mg/m3The toluene content was 108mg/m3The xylene content was 153mg/m3。
The comprehensive treatment method comprises the following steps:
(1) organic waste gas 20000m3H ofThe flow enters a heat exchange device 1, the heat exchange device 1 exchanges heat with nitrogen to reduce the temperature to 180 ℃, the cooled organic waste gas enters a cooling device 2, and the cooled organic waste gas enters a mixing pipeline 3; the nitrogen exchanges heat with the organic waste gas in the heat exchange device 1 and is heated to 120 ℃;
(2) the steam conveying device 4 sprays mixed steam into the mixing pipeline 3, the mixed steam comprises hydrogen peroxide steam and water vapor, the volume content of the hydrogen peroxide steam in the mixed steam is 50%, and the mixed steam and the organic waste gas are mixed to form mixed gas;
the temperature detection module 5 detects the temperature of the mixed gas in real time and sends temperature detection data to the control device, a preset temperature is input into the control device to be 0-30 ℃, the control device receives the temperature detection data and then compares the temperature detection data with the preset temperature, no operation is performed if the actually measured temperature is within the range of 0-30 ℃, the coolant flow in the cooling device 2 is reduced if the actually measured temperature is lower than 0 ℃, and the coolant flow in the cooling device 2 is increased if the actually measured temperature is higher than 30 ℃;
the humidity detection module 6 detects the humidity of the mixed gas in real time and sends humidity detection data to the control device, the preset humidity is input into the control device to be 40-70%, the control device receives the humidity detection data and then compares the humidity detection data with the preset humidity, no operation is performed if the actually measured humidity is within the range of 40-70%, the flow rate of the mixed steam conveyed by the steam conveying device 4 is increased if the actually measured humidity is lower than 40%, and the flow rate of the mixed steam conveyed by the steam conveying device 4 is reduced if the actually measured humidity is higher than 70%;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube 8, an electron beam emission source 9 emits high-energy electron beams, the mixed steam generates strong oxidizing radicals such as hydroxyl radicals and oxygen radicals and ozone under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized into harmless substances by the strong oxidizing substances;
(4) introducing the oxidized organic waste gas into a spraying device 11 for circulating spraying, wherein the spraying liquid is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol, the mass fraction of the sodium citrate in the spraying liquid is 10%, the mass fraction of the sodium carbonate in the spraying liquid is 10%, and the mass fraction of the polyethylene glycol in the spraying liquid is 5%;
(5) the organic waste gas after spraying treatment is introduced into a photocatalysis device 16, an ultraviolet lamp group 17 comprises 12 ultraviolet lamps which are equidistantly arranged on the inner wall of a shell of the photocatalysis device, the wavelength of ultraviolet light emitted by the ultraviolet lamps is controlled to be 260nm, and VOC in the organic waste gas is excited by the ultraviolet light to carry out photocatalytic reaction to generate CO2And H2O, then the organic waste gas passes through the activated carbon bed layer 18 to further adsorb residual VOC and then is discharged;
(6) after the organic waste gas is discharged from the photocatalytic device 16, nitrogen gas which is subjected to heat exchange and is heated to 120 ℃ in the step (1) is introduced into the photocatalytic device 16, the VOC in the activated carbon bed layer 18 is adsorbed to realize activated carbon regeneration, the heat exchange medium which is adsorbed by the VOC is discharged and enters the condensing device 23, the high-boiling-point VOC in the heat exchange medium is condensed to 30 ℃ and then is collected and enters the collecting device 24, and the condensed heat exchange medium enters the heat exchange device 1 to repeatedly perform the step (1).
The organic waste gas discharged by the photocatalytic device 16 is sampled and detected, and the detection result is as follows: the benzene content in the organic waste gas is 6.4mg/m3Toluene content of 3mg/m3The xylene content is 4.7mg/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 comprehensive treatment system for the VOC organic waste gas is characterized by comprising a heat exchange device, an electron emission device, a spraying device and a photocatalysis device which are sequentially connected;
the electron emission device comprises an electrostatic shielding tube and an electron beam emission source arranged at one end of the electrostatic shielding tube, organic waste gas is introduced into the electrostatic shielding tube, and the electron beam emission source emits high-energy electron beams to the organic waste gas;
the inside active carbon bed layer and the ultraviolet banks of having set gradually from top to bottom of photocatalysis device.
2. The integrated processing system according to claim 1, wherein a cooling device is disposed on the connection pipeline between the heat exchanging device and the electron emission device;
preferably, the cooling device is a cold trap.
3. The integrated processing system according to claim 1 or 2, wherein said cooling means is connected to the electron emission means through a mixing line;
preferably, the outlet end of the mixing pipeline is positioned inside the electron emission device;
preferably, a nozzle is arranged at the outlet end of the mixing pipeline;
preferably, along the flow direction of the organic waste gas, a steam conveying device and a detection assembly are sequentially connected to the mixing pipeline, and the steam conveying device is used for spraying mixed steam into the pipeline;
preferably, the mixed steam comprises hydrogen peroxide steam and water vapor;
preferably, the detection assembly comprises a temperature detection module and a humidity detection module.
4. An integrated processing system according to any of claims 1 to 3, further comprising control means, said control means being independently electrically connected to the temperature sensing means and the humidity sensing means, respectively;
preferably, the control device is respectively and independently connected with the cooling device and the steam conveying device in a feedback manner, the control device is used for receiving temperature detection data sent by the temperature detection module and controlling the flow rate of a cooling medium of the cooling device, and the control device is used for receiving humidity detection data sent by the humidity detection module and controlling the flow rate of mixed steam conveyed by the steam conveying device.
5. The integrated processing system according to any one of claims 1 to 4, wherein the spraying means is internally filled with a spraying liquid;
preferably, the spraying device comprises a shell and a spraying liquid circulating pipeline externally connected with the bottom of the shell, and the outlet end of the spraying liquid circulating pipeline is positioned in the shell;
preferably, a spray head is arranged at the outlet end of the spray liquid circulating pipeline;
preferably, a circulating pump is arranged on the spraying liquid circulating pipeline;
preferably, a defogging device is further arranged inside the shell, and the defogging device is positioned above the spraying device.
6. The integrated processing system according to any one of claims 1 to 5, wherein the heat exchange means is cyclically connected to the photocatalytic means;
preferably, a heat exchange medium channel and an organic waste gas channel which are mutually independent are arranged in the heat exchange device;
preferably, the heat exchange medium channel is circularly connected with the photocatalytic device, the heat exchange medium circularly flows between the heat exchange medium channel and the photocatalytic device, and the heat exchange medium and the organic waste gas are used for desorbing activated carbon filled in the photocatalytic device after heat exchange and temperature rise in the heat exchange device;
preferably, the heat exchange medium is nitrogen.
7. The integrated processing system according to any one of claims 1 to 6, wherein the top of the photocatalytic device is provided with a heat exchange medium outlet and an organic waste gas outlet, and the bottom of the photocatalytic device is provided with a heat exchange medium inlet;
preferably, the heat exchange medium inlet of the photocatalytic device is connected with the outlet end of the heat exchange medium channel through a heat exchange medium outlet;
preferably, the outlet of the heat exchange medium of the photocatalytic device is connected with the inlet end of the heat exchange medium channel through a heat exchange medium loop;
preferably, the heat exchange medium outlet and the heat exchange medium loop are both provided with flow valves;
preferably, a condensing device is further arranged on the heat exchange medium loop;
preferably, the condensing device is externally connected with a collecting device;
preferably, an organic waste gas outlet of the photocatalytic device is connected with an exhaust fan.
8. The integrated processing system according to any of claims 1 to 7, wherein the ultraviolet lamp assembly comprises at least two ultraviolet lamps disposed on an inner wall of the housing of the photocatalytic device;
preferably, 6-12 ultraviolet lamps are arranged along the circumferential direction of the photocatalytic device shell at equal intervals.
9. An integrated treatment method for VOC organic waste gas, characterized in that, the integrated treatment system of any one of claims 1-8 is used to perform integrated treatment for VOC organic waste gas, the integrated treatment method comprises:
the method comprises the following steps that (I) organic waste gas is subjected to heat exchange with a heat exchange medium in a heat exchange device and then enters an electron emission device, and the electron emission device emits high-energy electron beams to oxidize VOC in the organic waste gas;
(II) introducing the oxidized organic waste gas into a spraying device for circulating spraying;
(III) introducing the organic waste gas after spraying treatment into a photocatalysis device, and carrying out photocatalytic reaction on VOC in the organic waste gas under the excitation of ultraviolet light to generate CO2And H2And O, and then, the organic waste gas passes through the activated carbon bed layer to further adsorb residual VOC and then is discharged.
10. The integrated processing method according to claim 9, wherein the step (i) specifically comprises:
(1) the organic waste gas enters a cooling device after heat exchange, and enters a mixing pipeline after being cooled;
(2) the steam conveying device sprays mixed steam into the mixing pipeline, the mixed steam and the organic waste gas are mixed to form mixed gas, the detection assembly detects the temperature and the humidity of the mixed gas, the detection result is fed back to the control device, and the control device adjusts the coolant flow of the cooling device and the mixed steam sprayed by the steam conveying device according to the detection result;
(3) the mixed gas with the standard detection result enters an electrostatic shielding tube, an electron beam emission source emits high-energy electron beams, mixed steam generates oxidizing substances under the bombardment of the electron beams, and harmful substances in the organic waste gas are oxidized and removed by the oxidizing substances;
preferably, the flow rate of the organic waste gas in the step (1) is 10000-20000 m3/h；
Preferably, the organic waste gas exchanges heat with a heat exchange medium in a heat exchange device;
preferably, the organic waste gas and a heat exchange medium exchange heat and are cooled to 150-180 ℃;
preferably, the heat exchange medium exchanges heat with the organic waste gas and is heated to 80-120 ℃;
preferably, the mixed steam in the step (2) comprises hydrogen peroxide steam and water vapor;
preferably, the volume content of the hydrogen peroxide steam in the mixed steam is 30-50%;
preferably, the control process of the control device in the step (2) comprises independent logic control of the temperature of the mixed gas and independent logic control of the humidity of the mixed gas;
preferably, the process of the control device performing the independent logic control on the temperature of the mixed gas comprises:
the temperature detection module detects the temperature of the mixed gas in real time and sends measured temperature data to the control device, the control device receives the measured temperature data and then compares the measured temperature data with a preset temperature range, if the measured temperature is within the preset temperature range, no operation is carried out, if the measured temperature is lower than the lowest value of the preset temperature range, the cooling device is controlled to increase the flow of the coolant, and if the measured temperature is higher than the highest value of the preset temperature range, the cooling device is controlled to reduce the flow of the coolant;
preferably, the preset temperature range is 0-30 ℃;
preferably, the process of controlling the humidity of the mixed gas logically by the control device comprises:
the humidity detection module detects the humidity of the mixed gas in real time and sends measured humidity data to the control device, the control device receives the measured humidity data and then compares the measured humidity data with a preset humidity range, if the measured humidity is within the preset humidity range, no operation is carried out, if the measured humidity is lower than the lowest value of the preset humidity range, the steam conveying device is controlled to improve the output mixed steam flow, and if the measured humidity is higher than the highest value of the preset humidity range, the steam conveying device is controlled to reduce the output mixed steam flow;
preferably, the preset humidity range is 40-70%;
preferably, the oxidizing substance of step (3) comprises oxidizing radicals and ozone;
preferably, the oxidative radicals include hydroxyl radicals and oxygen radicals;
preferably, the spraying liquid stored in the spraying device in the step (II) is a mixed solution of sodium citrate, sodium carbonate and polyethylene glycol;
preferably, the mass fraction of the sodium citrate in the spray liquid is 5-10%;
preferably, the mass fraction of the sodium carbonate in the spray liquid is 5-10%;
preferably, the mass fraction of the polyethylene glycol in the spray liquid is 1-5%;
preferably, the wavelength of the ultraviolet light emitted by the ultraviolet lamp set in the step (III) is 180-260 nm;
preferably, step (iii) further comprises: after the organic waste gas is discharged from the photocatalytic device, introducing a heat exchange medium subjected to heat exchange and temperature rise in the step (I) into the photocatalytic device, adsorbing VOC in an activated carbon bed layer to realize activated carbon regeneration, discharging the heat exchange medium adsorbed with the VOC into a condensing device, condensing high-boiling-point VOC in the heat exchange medium, collecting the condensed high-boiling-point VOC, and then feeding the condensed heat exchange medium into the heat exchange device to repeatedly perform the step (I);
preferably, the condensing device condenses the heat exchange medium adsorbed with the VOC to 10-30 ℃.
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