CN115671972B - Treatment method for waste gas and waste smoke of asphalt station - Google Patents
Treatment method for waste gas and waste smoke of asphalt station Download PDFInfo
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- CN115671972B CN115671972B CN202211152375.0A CN202211152375A CN115671972B CN 115671972 B CN115671972 B CN 115671972B CN 202211152375 A CN202211152375 A CN 202211152375A CN 115671972 B CN115671972 B CN 115671972B
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a method for treating waste gas and waste smoke of an asphalt station, and belongs to the technical field of environmental engineering waste gas treatment. According to the invention, the waste gas and smoke of the asphalt station are subjected to spray tower elution to remove fine particles, then enter an oil and water removing device to remove oil and water through a plasma technology, enter a screen filter to remove smoke and dust, then enter an active carbon adsorption box to adsorb organic substances, and the desorbed organic substances enter a catalytic combustion device to be thoroughly purified. The wire mesh filter is made of gamma-Al 2 O 3 The synthetic fiber filter cotton is a primary filter cotton of a filter material and the carbon nano tube synthetic fiber filter cotton is a medium-effect filter cotton of the filter material, so that the filter efficiency is high, the equipment size can be reduced, the replacement is convenient, and the service life of the filter cotton is prolonged due to high dust holding capacity; the active carbon adsorption box is made of rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material, so that the specific surface area of the adsorption material and the adsorption rate of organic substances can be improved.
Description
Technical Field
The invention belongs to the technical field of environmental engineering waste gas treatment, and relates to a waste gas and waste smoke treatment method for an asphalt station.
Background
The asphalt waste gas mainly comprises asphalt tar, asphalt smoke, liquid tar, gaseous tar, aromatic hydrocarbon, heterocyclic compound and other unpleasant gases, dust and micromolecular substances generated in the powder adding process. The modified asphalt waste gas has the characteristics of heavy smell and long service life of polycyclic aromatic hydrocarbon. Asphalt fume is aerosol and vapor produced by asphalt heating and burning of asphalt-containing substances, and volatile matters in asphalt fume are discharged into the atmosphere to become one of atmospheric pollutants. Asphalt smoke waste gas is generally mixed with smoke dust with a certain concentration, is brown or black, and has strong stimulation effect. The compounds containing more than 6 carbon atoms have cancerogenic action on skin and respiratory system, and the study and animal experiments prove that benzopyrene extracted from coal tar, asphalt and organic solvent is a strong cancerogenic substance. At present, the treatment of asphalt fume mainly comprises a plasma method, a uv photodecomposition method, a combustion method and other treatment methods, wherein the plasma method and the uv photodecomposition method are both to treat the asphalt fume by adopting electricity and light, the potential safety hazard of combustion explosion exists, and the combustion method is to contact and combust combustible substances contained in the asphalt fume with air at a certain temperature.
Patent CN101776273a discloses a method for efficiently treating asphalt flue gas, which adopts calcined flue gas of a post-combustion chamber of a rotary kiln, so that asphalt flue gas produced by manufacturing a raw anode passes through the post-combustion chamber of the rotary kiln, tar and polycyclic aromatic hydrocarbon in the asphalt flue gas in the post-combustion chamber of the rotary kiln are decomposed and combusted, and benzopyrene harmful substances are effectively removed, but the method has the defects of high energy consumption, low economy, secondary pollution and environmental protection.
Patent CN105771582a discloses a method for treating waste gas produced by modified asphalt waterproof material, wherein asphalt waste gas is treated by a high-speed centrifugal gas-liquid separator, liquid Jiao Youlei liquid is trapped by inertia, the treated waste gas is treated by a cross-flow bed adsorption process, and finally, peculiar smell is further eliminated by ozone deep oxidation. The patent uses a purification method combining centrifugal separation and cross-flow bed adsorption.
Patent publication number CN109692561a discloses a method for purifying modified asphalt waste gas by catalytic oxidation, wherein the modified asphalt waste gas is first atomized by an atomization device, then particles are removed by an adsorption device, then the oxidant is fully mixed with the waste gas by an oxidant mixed flow device, oxidation reaction occurs in the oxidation device, and finally the mixture is conveyed to a catalytic device, so that the oxidant and water are subjected to deep oxidation on organic matters under the action of a catalyst, and clean gas is discharged outside through a fan. The invention utilizes the fact that particles in the atomized modified asphalt waste gas are more easily trapped, then are adsorbed, and finally are subjected to catalytic oxidation, and does not disclose the technical scheme of the invention for adsorbing the filter cotton and the high-adsorption honeycomb activated carbon.
Patent publication No. CN105536436A discloses a method for purifying organic waste gas generated by asphalt processing, which comprises the steps of collecting the organic waste gas, and then carrying out secondary spray absorption and activated carbon adsorption purification. The invention combines the technical scheme of spraying and active carbon adsorption to purify organic waste gas, and does not disclose the technical scheme of filter cotton and high-adsorption honeycomb active carbon adsorption in the invention.
Patent publication number CN109985503a discloses a process for purifying and treating asphalt fume exhaust gas, which comprises the following specific steps: under the action of a draught fan, conveying the asphalt fume and waste gas into a countercurrent atomizing alkali spray tower at a low gas speed, performing first-step treatment on the asphalt fume and waste gas by using alkaline water, conveying the asphalt fume and waste gas into a countercurrent purifying and washing tower for water washing and purifying, conveying the asphalt fume and waste gas into a three-phase multi-medium catalytic oxidation tower, passing through a packing layer in the tower from bottom to top, spraying hydrogen peroxide and ferrous sulfate into a liquid phase in the tower by using a dosing tank outside the tower, and adjusting the pH value to purify the final gas and discharging the final gas at high altitude. The technical scheme disclosed by the invention is an exhaust gas purification process combining alkali spraying, water washing purification and catalytic oxidation, and the technical scheme of filter cotton and high-adsorption honeycomb activated carbon adsorption in the invention is not disclosed.
Disclosure of Invention
The invention aims to provide a treatment method for waste gas and waste smoke of an asphalt station, which is characterized in that the waste gas and waste smoke of the asphalt station are subjected to fine particle elution through a spray tower, then enter an oil and water removing device to remove oil and water through a plasma technology, then enter a screen filter to remove smoke and dust, then enter an active carbon adsorption box to adsorb organic substances, and the desorbed organic substances enter a catalytic combustion device to be thoroughly purified. The wire mesh filter is made of gamma-Al 2 O 3 The synthetic fiber filter cotton is a primary filter cotton of a filter material and the carbon nano tube synthetic fiber filter cotton is a medium-effect filter cotton of the filter material, so that the filter efficiency is high, the equipment size can be reduced, the replacement is convenient, the service life of the filter cotton is prolonged due to high dust holding capacity, and the filter cotton is energy-saving and environment-friendly; the active carbon adsorption box is made of rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material, so that the specific surface area of the adsorption material and the adsorption rate of organic substances can be improved; the removal rate of VOCs in the waste gas and waste smoke treatment process of the asphalt station can reach more than 99%.
The aim of the invention can be achieved by the following technical scheme:
a method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Waste gas and smoke of the asphalt station enter a spray tower through a draught fan, and fine particles are sprayed and eluted through the spray tower;
(2) The waste gas and waste smoke from which fine particles are eluted enters a deoiling and defogging device, and oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters;
(4) Waste gas from asphalt station enters an active carbon adsorption box, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device and then discharging the organic matters.
As a preferable technical scheme of the invention, the spray nozzles at the upper end of the spray tower spray the absorption liquid uniformly distributed on the filler, and the waste gas and the waste smoke of the asphalt station are contacted with the absorption liquid on the surface of the filler, so that the aim of eluting fine particles in the waste gas and the waste smoke of the asphalt station is fulfilled by utilizing the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler, and the waste gas and the waste smoke of the asphalt station have more contact area and reaction time with the absorption liquid on the surface of the filler.
As a preferable technical scheme of the invention, the oil and mist removing device in the step (2) adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purposes of oil and mist removing are achieved.
As a preferable technical scheme of the invention, the silk screen filter in the step (3) consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes the carbon nano tube synthetic fiber filter cotton as the filter material.
As a preferable technical scheme of the invention, the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The addition of the powder accounts for 10 to 20 percent of the weight of the polyester resin fiber, the polyester resin fiber is laid into a net layer, then the net layer is heated to 200 to 220 ℃, and finally the gamma-Al is obtained after cooling and shaping 2 O 3 Synthetic fiber filter cotton.
As a preferable technical scheme of the invention, the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
the method comprises the steps of opening agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 5-9% of the weight of the polyurethane resin fibers, paving the polyurethane resin fibers into a mesh layer, heating the mesh layer to 250-270 ℃, and finally cooling and shaping the mesh layer to obtain the carbon nanotube synthetic fiber filter cotton.
As a preferable technical scheme of the invention, 3 adsorption beds are set in the activated carbon adsorption box in the step (4), and the design air quantity of a single bed is 10000m 3 And/h, performing automatic switching of adsorption and desorption when the main fan works.
As a preferable technical scheme of the invention, the preparation method of the high-adsorption honeycomb activated carbon in the step (4) comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to the weight ratio of 55-70:8-15:100:20-30, kneading and refining at 90-120 ℃ to obtain a plasticizing material, then extruding and molding in a honeycomb die and drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 500-700 ℃, cooling, and then placing the honeycomb blank in a cremator at 750-850 ℃ for activating for 0.5-1 h to obtain the high-adsorption honeycomb activated carbon.
As a preferable technical scheme of the invention, the catalyst adopted by the catalytic combustion device in the step (5) is a TFJF catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The noble metals Pd and Pt are used as active components.
As a preferable technical scheme of the invention, the temperature of the catalytic combustion device in the step (5) is 250-300 ℃, and the heat generated by catalytic combustion is used for desorbing organic matters in the adsorption box, so that the energy is recycled.
The invention has the beneficial effects that:
(1) The invention filters the waste gas and smoke passing through the spray tower and the oil and mist removing device by a silk screen filter, wherein the silk screen filter is formed by gamma-Al 2 O 3 The synthetic fiber filter cotton is a primary filter cotton of a filter material and the carbon nano tube synthetic fiber filter cotton is a medium-efficiency filter cotton of a filter material, and gamma-Al is adopted respectively 2 O 3 The filter cotton has stronger adsorption capacity and larger porosity due to the combination of the carbon nano tube and the polyester resin fiber and the combination of the carbon nano tube and the polyurethane resin fiber, so that the resistance is small, the dust holding capacity is large, and the service life of the silk screen filter can be prolonged finally, and the service life of the silk screen filter is longer than 6000 hours, and is energy-saving and environment-friendly;
(2) The high adsorption honeycomb activated carbon in the activated carbon adsorption box is prepared by rosin and gamma-Al 2 O 3 Compounding with honeycomb active carbon to make the high adsorption honeycomb active carbon have large specific surface area and fine poresThe volume is large, and the adsorption capacity is strong; the specific surface area of the high-adsorption honeycomb activated carbon is more than 800m 2 Per gram, pore volume greater than 0.3ml/g, static benzene adsorption rate greater than 40%;
(3) The heat generated by catalytic combustion in the catalytic combustion device is used for desorbing organic matters in the adsorption box, and the energy is recycled;
(4) The invention adopts the gamma-Al 2 O 3 The primary filter cotton with synthetic fiber filter cotton as filter material and the intermediate filter cotton with carbon nanotube synthetic fiber filter cotton as filter material are filtered to remove residual smoke and dust after spraying, deoiling and demisting, and then the smoke and dust are filtered by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon obtained by compounding the high-adsorption honeycomb activated carbon is used for adsorbing organic substances, and finally desorbed organic substances are thoroughly purified by catalytic combustion.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a flow chart of the treatment process of the waste gas and the waste smoke of the asphalt station in the embodiment 1 of the invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1, a method for treating waste gas and waste smoke of an asphalt station comprises the following steps:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters; the silk screen filter consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 16 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 220 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 8% of the weight of the polyurethane resin, paving a net layer, heating to 265 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
The screen filter has small resistance, large dust holding capacity and service life up to 7500h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And/h, automatically switching adsorption and desorption when the main fan works, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to a weight ratio of 55:9:100:24, kneading and refining at 100 ℃ to obtain a plasticizing material, then extruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 550 ℃, cooling, and then placing the honeycomb blank in a cremator at 850 ℃ for activating for 0.8h to obtain the high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon reaches 820m 2 Per gram, the pore volume reaches 0.38ml/g, and the static benzene adsorption rate reaches 49%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and then discharging the organic matters, wherein the catalytic combustion device adopts a catalyst which is a TFJF (reverse flow reaction) catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station can reach 99.7 percent.
Example 2
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters; the silk screen filter consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 11 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 210 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 6% of the weight of the polyurethane resin, paving a net layer, heating to 270 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
The screen filter has small resistance, large dust holding capacity and long service life of 6800h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And/h, automatically switching adsorption and desorption when the main fan works, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to a weight ratio of 61:11:100:21, kneading and refining at 120 ℃ to obtain a plasticizing material, then extruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 650 ℃, cooling, and then placing the honeycomb blank in a cremator at 800 ℃ for activating for 0.6h to obtain the high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon reaches 809m 2 Per gram, the pore volume reaches 0.32ml/g, and the static benzene adsorption rate reaches 46%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and then discharging the organic matters, wherein the catalytic combustion device adopts a catalyst which is a TFJF (reverse flow reaction) catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station can reach 99.3 percent.
Example 3
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters; the silk screen filter consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 Synthetic fiber filter cottonThe preparation method of (2) comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 12 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 200 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 5% of the weight of the polyurethane resin, paving a net layer, heating to 255 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
The screen filter has small resistance, large dust holding capacity and long service life of 6900h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And/h, automatically switching adsorption and desorption when the main fan works, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing the powder, the powdered activated carbon and the methylcellulose according to the weight ratio of 70:14:100:27, kneading and refining at 100 ℃ to obtain a plasticizing material, then extruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 700 ℃, cooling, and activating for 0.5h at 750 ℃ in a cremator to obtain the high-adsorption honeycomb activated carbon;
the high adsorption honeycomb active carbon proportion meterThe area reaches 831m 2 Per gram, the pore volume reaches 0.37ml/g, and the static benzene adsorption rate reaches 45%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and then discharging the organic matters, wherein the catalytic combustion device adopts a catalyst which is a TFJF (reverse flow reaction) catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station can reach 99.5 percent.
Comparative example 1
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screenThe filter further filters out smoke and dust to obtain asphalt station waste gas containing organic matters; the silk screen filter consists of primary filter cotton and middle-effect filter cotton, wherein the primary filter cotton and the middle-effect filter cotton are both made of gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 16 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 220 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the service life of the silk screen filter is 5200h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And/h, automatically switching adsorption and desorption when the main fan works, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
Crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to a weight ratio of 55:9:100:24, kneading and refining at 100 ℃ to obtain a plasticizing material, then extruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 550 ℃, cooling, and then placing the honeycomb blank in a cremator at 850 ℃ for activating for 0.8h to obtain the high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon reaches 820m 2 Per gram, the pore volume reaches 0.38ml/g, and the static benzene adsorption rate reaches 49%;
(5) To be treatedStopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, entering a catalytic combustion device, thoroughly purifying and then discharging, wherein the catalyst adopted by the catalytic combustion device is a TFJF catalyst, namely cordierite honeycomb ceramic is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station is 94.1%.
Comparative example 2
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters; the silk screen filter consists of primary filter cotton and middle-effect filter cotton, wherein the primary filter cotton and the middle-effect filter cotton both take carbon nano tube synthetic fiber filter cotton as filter materials;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 8% of the weight of the polyurethane resin, paving a net layer, heating to 265 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
the service life of the silk screen filter is 5000h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And/h, automatically switching adsorption and desorption when the main fan works, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
Crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to a weight ratio of 55:9:100:24, kneading and refining at 100 ℃ to obtain a plasticizing material, then extruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 550 ℃, cooling, and then placing the honeycomb blank in a cremator at 850 ℃ for activating for 0.8h to obtain the high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon reaches 820m 2 Per gram, the pore volume reaches 0.38ml/g, and the static benzene adsorption rate reaches 49%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and discharging the organic matters, wherein the catalyst adopted by the catalytic combustion device is a TFJF catalyst, namely cordierite is adoptedHoneycomb ceramics as a first support, gamma-Al 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station is 93.7%.
Comparative example 3
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters; the silk screen filter consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 16 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 220 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 8% of the weight of the polyurethane resin, paving a net layer, heating to 265 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
The screen filter has small resistance, large dust holding capacity and service life up to 7500h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And (h) automatically switching adsorption and desorption when the main fan works, wherein the high-adsorption honeycomb activated carbon compounded by rosin and honeycomb activated carbon in the activated carbon adsorption box is used as an adsorption material to adsorb organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin, powdered activated carbon and methylcellulose according to a weight ratio of 64:100:24, kneading and refining at 100 ℃ to obtain a plasticizing material, then extruding and molding in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 550 ℃, cooling, and then placing the honeycomb blank in a cremator at 850 ℃ for activating for 0.8h to obtain the high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon is 600m 2 Per g, pore sizeVolume is 0.22ml/g, and static benzene adsorption rate is 31%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and then discharging the organic matters, wherein the catalytic combustion device adopts a catalyst which is a TFJF (reverse flow reaction) catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station is 92.9%.
Comparative example 4
A method for treating waste gas and smoke from an asphalt station, the method comprising the steps of:
(1) Enabling waste gas and waste smoke of the asphalt station to enter a spray tower through a draught fan, spraying and eluting fine particles through the spray tower, spraying an absorption liquid by a spray head at the upper end of the spray tower, uniformly distributing the absorption liquid on a filler, and enabling the waste gas and waste smoke of the asphalt station to contact with the absorption liquid on the surface of the filler, wherein the characteristics of high mechanical strength, corrosion resistance, high void ratio and large surface of the filler are utilized, and the waste gas and waste smoke of the asphalt station and the absorption liquid have more contact area and reaction time on the surface of the filler so as to achieve the aim of eluting the fine particles in the waste gas and waste smoke of the asphalt station;
(2) The waste gas and waste smoke from which fine particles are eluted enter a deoiling and defogging device, oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device, the deoiling and defogging device adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and waste smoke, gas is broken down, active particles comprising high-energy electrons, ions, atoms and free radicals are generated, and the active particles are utilized to further act with pollutants in the waste gas and waste smoke, so that pollutant molecules are decomposed, and the purpose of deoiling and defogging is achieved;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the oil-containing waste gas and the waste smokeAsphalt plant exhaust gas with organic matter; the silk screen filter consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The powder accounts for 16 percent of the weight of the polyester resin fiber, and is laid into a net layer, then heated to 220 ℃, and finally cooled and shaped to obtain the gamma-Al 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nanotube powder in the carding process of the fibers, wherein the addition amount of the carbon nanotubes accounts for 8% of the weight of the polyurethane resin, paving a net layer, heating to 265 ℃, and finally cooling and shaping to obtain carbon nanotube synthetic fiber filter cotton;
The screen filter has small resistance, large dust holding capacity and service life up to 7500h;
(4) The waste gas of the asphalt station enters an activated carbon adsorption box, 3 adsorption beds are set in the activated carbon adsorption box, and the design air quantity of a single bed is 10000m 3 And (h) automatically switching adsorption and desorption when the main fan works, wherein the high-adsorption honeycomb activated carbon compounded by rosin and honeycomb activated carbon in the activated carbon adsorption box is used as an adsorption material to adsorb organic substances in the waste gas of the asphalt station, and clean gas is discharged; the preparation method of the high-adsorption honeycomb activated carbon comprises the following steps:
gamma-Al 2 O 3 Mixing with powdered activated carbon and methylcellulose according to the weight ratio of 64:100:24, kneading and refining at 100 ℃ to obtain a plasticized material, and thenExtruding and forming in a honeycomb die, drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 550 ℃, cooling, and activating for 0.8h at 850 ℃ in a cremator to obtain high-adsorption honeycomb activated carbon;
the specific surface area of the high-adsorption honeycomb activated carbon is 490m 2 Per gram, pore volume of 0.20ml/g, static benzene adsorption rate of 30%;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device, and then discharging the organic matters, wherein the catalytic combustion device adopts a catalyst which is a TFJF (reverse flow reaction) catalyst, namely cordierite honeycomb ceramics is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The catalytic combustion device is a second carrier, noble metals Pd and Pt are used as active components, the temperature of the catalytic combustion device is 250-300 ℃, heat generated by catalytic combustion is used for desorbing organic matters in an adsorption box, energy is recycled, and energy sources are saved; through the purification treatment process of the embodiment, the removal rate of VOCs in waste gas and waste smoke of the asphalt station is 92.9%.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. A method for treating waste gas and waste smoke of an asphalt station, which is characterized by comprising the following steps:
(1) Waste gas and smoke of the asphalt station enter a spray tower through a draught fan, and fine particles are sprayed and eluted through the spray tower;
(2) The waste gas and waste smoke from which fine particles are eluted enters a deoiling and defogging device, and oil and water in the waste gas and waste smoke are removed through a plasma technology of the deoiling and defogging device;
(3) The waste gas and the waste smoke after removing the oil and the water enter a silk screen filter to further filter the smoke and the dust to obtain the waste gas of the asphalt station containing organic matters;
(4) Waste gas from asphalt station enters an active carbon adsorption box, wherein the active carbon adsorption box is formed by rosin and gamma-Al 2 O 3 The high-adsorption honeycomb activated carbon compounded with the honeycomb activated carbon is used as an adsorption material for adsorbing organic substances in the waste gas of the asphalt station, and clean gas is discharged;
(5) Stopping sucking the waste gas of the asphalt station when the organic matters in the adsorption box reach a saturated state, desorbing the organic matters in the adsorption box, and thoroughly purifying the organic matters in the adsorption box by a catalytic combustion device and then discharging the organic matters;
the silk screen filter in the step (3) consists of primary filter cotton and intermediate filter cotton, wherein the primary filter cotton adopts gamma-Al 2 O 3 The synthetic fiber filter cotton is a filter material, and the medium-efficiency filter cotton takes carbon nano tube synthetic fiber filter cotton as a filter material;
the gamma-Al 2 O 3 The preparation method of the synthetic fiber filter cotton comprises the following steps:
the agglomerated polyester resin fibers are subjected to a powerful opening procedure to be opened, the fibers are carded into fibers with uniform thickness, and gamma-Al is implanted in the carding process of the fibers 2 O 3 Powder, gamma-Al 2 O 3 The addition of the powder accounts for 10 to 20 percent of the weight of the polyester resin fiber, the polyester resin fiber is laid into a net layer, then the net layer is heated to 200 to 220 ℃, and finally the gamma-Al is obtained after cooling and shaping 2 O 3 Synthetic fiber filter cotton;
the preparation method of the carbon nano tube synthetic fiber filter cotton comprises the following steps:
opening the agglomerated polyurethane resin fibers through a strong opening process, carding the fibers into fibers with uniform thickness, implanting carbon nano tube powder in the carding process of the fibers, wherein the addition amount of the carbon nano tube accounts for 5-9% of the weight of the polyurethane resin fibers, paving a net layer, heating to 250-270 ℃, and finally cooling and shaping to obtain the carbon nano tube synthetic fiber filter cotton;
the preparation method of the high-adsorption honeycomb activated carbon in the step (4) comprises the following steps:
crushing and grinding rosin resin to above 120 meshes, mixing the ground rosin with gamma-Al 2 O 3 Mixing powder, powdered activated carbon and methyl cellulose according to the weight ratio of 55-70:8-15:100:20-30, kneading and refining at 90-120 ℃ to obtain a plasticizing material, then extruding and molding in a honeycomb die and drying to obtain a honeycomb blank, carbonizing the honeycomb blank at 500-700 ℃, cooling, and then placing the honeycomb blank in an activation furnace for activating for 0.5-1 h at 750-850 ℃ to obtain the high-adsorption honeycomb activated carbon.
2. The method for treating waste gas and waste smoke of asphalt plant according to claim 1, wherein the absorbing liquid sprayed from the spray head at the upper end of the spray tower in step (1) is uniformly distributed on the filler, and the waste gas and waste smoke of asphalt plant and the absorbing liquid are contacted on the surface of the filler, so as to achieve the purpose of eluting fine particles in the waste gas and waste smoke of asphalt plant.
3. The method for treating waste gas and waste smoke of asphalt station according to claim 1, wherein the oil and mist removing device in step (2) adopts 220V or 380V alternating current, a high-frequency pulse electric field is obtained through an oscillation boosting device, when the voltage reaches the discharge voltage of the waste gas and smoke, the gas is broken down to generate active particles comprising high-energy electrons, ions, atoms and free radicals, and the active particles are utilized to further act with pollutants in the waste gas and smoke to decompose the pollutant molecules so as to achieve the purposes of oil removal and mist removal.
4. The method for treating waste gas and smoke of asphalt plant according to claim 1, wherein 3 adsorption beds are set in the activated carbon adsorption box in the step (4), and the single-bed design air quantity is 10000m 3 And/h, performing automatic switching of adsorption and desorption when the main fan works.
5. The method for treating exhaust gas and fume from asphalt plant according to claim 1, wherein said catalytic combustion device in step (5) is used The catalyst is TFJF catalyst, namely cordierite honeycomb ceramic is adopted as a first carrier, and gamma-Al is adopted as a catalyst 2 O 3 The noble metals Pd and Pt are used as active components.
6. The method for treating waste gas and waste smoke of asphalt plant according to claim 1, wherein the temperature of the catalytic combustion device in the step (5) is 250-300 ℃, and the heat generated by catalytic combustion is used for desorbing organic matters in an adsorption tank, so that energy is recycled.
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