CN115870324A - Continuous repairing device for organic contaminated soil - Google Patents
Continuous repairing device for organic contaminated soil Download PDFInfo
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- CN115870324A CN115870324A CN202310017270.2A CN202310017270A CN115870324A CN 115870324 A CN115870324 A CN 115870324A CN 202310017270 A CN202310017270 A CN 202310017270A CN 115870324 A CN115870324 A CN 115870324A
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Abstract
The invention discloses a continuous repairing device for organic contaminated soil, which belongs to the technical field of organic pollutant repairing and comprises a conveyor belt arranged in a shell, wherein the upper part of the conveyor belt is sequentially divided into a soil feeding area, an ozone water vapor reflux area, a variable-frequency microwave thermal desorption area and a UV digestion area along the soil conveying direction, and the conveyor belt is arranged in a microwave resonant cavity at the lower part of the shell; the tail of the shell is provided with a discharge hole, and the bottom of the conveyor belt is provided with a turnover mechanism which turns and breaks up the conveyed soil and increases the retention time of the soil on the conveyor belt. In the soil conveying process along with the conveyor belt, organic matters in the soil are desorbed out through ozone oxidation of an ozone water vapor reflux region and thermal desorption in a variable-frequency microwave thermal desorption region in sequence, gaseous organic matters desorbed out through thermal desorption are quickly digested through UV waves of the UV digestion region, and the microwave thermal desorption effect is improved through variable-frequency microwaves of different wavelengths radiated by the variable-frequency microwave thermal desorption region. The method is suitable for large-scale soil remediation, and simultaneously improves the soil remediation effect.
Description
Technical Field
The invention belongs to the technical field of organic pollutant remediation, and particularly relates to a continuous remediation device for organic contaminated soil.
Background
Along with the acceleration of the industrialization process, the available amount of soil is reduced rapidly, and along with the use of a large amount of pesticides and fertilizers, the environmental problem of soil organic pollution is increased day by day, and the remediation of the organic polluted soil becomes an important part of soil remediation.
Microwave thermal desorption is as a neotype thermal desorption mode that utilizes clean energy source, has advantages such as high-efficient rapid heating up, thermal desorption effect are strong and receives more researcher's attention gradually, and microwave thermal desorption inherits from traditional soil thermal desorption, rises soil horizon temperature, makes the temperature rise of organic pollutant who adheres to in the soil horizon, reaches self boiling point and evaporates, causes the mode of thermal desorption in organic pollutant follow soil horizon, reaches the restoration effect to soil. But pure microwave thermal desorption can not thoroughly remove tail gas, and this is because the self energy of microwave is not enough to break the covalent bond between the organic pollutant molecules of complicacy, consequently can not be with most organic pollutants of complicacy digestion transform into pollution-free micromolecule, often need be equipped with the combined use device to tail gas treatment, this again great promotion whole soil prosthetic devices's manufacturing cost.
Meanwhile, the traditional microwave resonant cavity is a standing wave type box resonant cavity, and is similar to material taking and placing type heating of a household microwave oven, and the heating mode has high operation cost for repairing the soil with huge repairing amount.
Disclosure of Invention
The invention aims to provide a continuous repairing device for organic contaminated soil, and aims to solve the technical problems that microwave thermal desorption in the prior art only can cause organic pollutants to be thermally desorbed from soil but cannot thoroughly digest tail gas, and a traditional microwave resonant cavity is not suitable for soil repair with large repair quantity.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the continuous remediation device for the organic contaminated soil comprises a conveyor belt used for conveying the soil to be remediated, wherein the conveyor belt is driven by a power component, the conveyor belt is arranged in a shell and sequentially divided into a soil feeding area, an ozone water vapor backflow area, a variable-frequency microwave thermal desorption area and a UV digestion area along the conveying direction of the soil, a feeding bin is arranged at the inlet end of the shell, the soil feeding area is arranged in the feeding bin, an air outlet of the ozone water vapor backflow area, the variable-frequency microwave thermal desorption area and the UV digestion area are all arranged above the conveyor belt and in an upper cavity of the shell, and the conveyor belt is arranged in a microwave resonant cavity at the lower part of the shell; the afterbody of casing is equipped with the discharge gate, the bottom of conveyer belt still is equipped with the tilting mechanism that is used for turning soil.
Preferably, soil feeding district is equipped with vibrating pump and sieve, the sieve sets up in the top import department in feeding storehouse, the below of sieve is the conveyer belt that links to each other with the conveyer belt, the vibrating pump sets up in the side of sieve for the vibration of drive sieve makes the large granule organic pollution soil sieve divide into on the conveyer belt that the tiny particle form dropped in the feeding storehouse.
Preferably, the sieve plate is inclined by 15 degrees, two sides of the sieve plate are connected with the top frame through springs, and the frames are arranged around the inlet of the feeding bin.
Preferably, the two sides of the conveying belt are provided with baffles, and the bottoms of the two sides of the conveying belt are provided with inclined pressing wheels for enabling the conveying belt to be high in the middle concave and the two sides.
Preferably, the turnover mechanism comprises three rollers and a plurality of scrapers, the three rollers are correspondingly arranged below the air outlet of the ozone water vapor reflux area, the variable-frequency microwave thermal desorption area and the UV digestion area, and the plurality of scrapers are radially and uniformly distributed on the surface of each roller; the three rollers are connected through a transmission chain and driven by a power component.
Preferably, the power part is a stepping motor, an output shaft of the stepping motor is coaxially fixed with a driving gear, and the driving gear is coaxially fixed with a driving wheel of the conveyor belt and is used for driving the conveyor belt to run; the driving gear is meshed with the turnover wheel, the turnover wheel drives the three rollers simultaneously through the transmission chain, and the scrapers around the rollers can intermittently jack up the conveying belt conveying soil above the rollers.
Preferably, the variable-frequency microwave thermal desorption region is provided with a variable-frequency solid microwave source, a coaxial transmission line, a microwave regular waveguide and a branch waveguide, the solid microwave source is connected with the microwave regular waveguide through the coaxial transmission line, and the microwave regular waveguide radiates microwaves in the UV digestion region and the microwave resonant cavity through the branch waveguide.
Preferably, the UV digestion region is provided with a catalytic net and a plurality of electrodeless ultraviolet lamps, the catalytic net is coated with a supported catalyst, and the plurality of electrodeless ultraviolet lamps are arranged below the catalytic net in parallel; the top of the catalysis net is provided with an exhaust pipe, and an exhaust port of the exhaust pipe extends to the outside of the shell.
Preferably, the supported catalyst is titanium dioxide taking silicon carbide as a carrier; the wavelength of the UV wave emitted by the electrodeless ultraviolet lamp tube is 185nm.
Preferably, ozone steam backward flow district is equipped with back flow and backward flow air exhauster, the backward flow air exhauster sets up on the back flow, the import and the blast pipe of back flow link to each other, the gas outlet of back flow sets up in the conveyer belt top of frequency conversion microwave thermal desorption district front side.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, in the process of conveying soil by the conveyor belt, the soil is subjected to ozone oxidation in the ozone water vapor reflux region, thermal desorption of organic matters in the soil in the variable-frequency microwave thermal desorption region and rapid digestion of gaseous organic matters generated by thermal desorption by using UV waves in the UV digestion region, the transmission path of microwaves is changed by using variable-frequency microwaves with different wavelengths radiated by the variable-frequency microwave thermal desorption region, different standing wave environments are generated in the microwave resonant cavity, and the microwave thermal desorption effect is improved under the same working power; meanwhile, the conveyed soil is turned and scattered into small particles by the aid of the turnover mechanism at the bottom of the conveyor belt, so that the retention time of the soil on the conveyor belt is prolonged, and the soil is fully repaired; the repaired soil is discharged from a discharge hole at the tail part of the shell. The method is suitable for large-scale soil remediation, and simultaneously improves the soil remediation effect by utilizing microwave thermal desorption, UV light digestion and ozone oxidation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of a continuous remediation device for organic contaminated soil according to an embodiment of the invention;
FIG. 2 is a plan view of the continuous restoring apparatus for organic contaminated soil of FIG. 1;
FIG. 3 is a schematic view showing the internal structure of the apparatus for continuously remediating organically-polluted soil of FIG. 1;
FIG. 4 is a schematic structural view of the continuous remediation device for organically-polluted soil of FIG. 1 with a casing removed;
fig. 5 is a top view of the plane where the electrodeless ultraviolet lamp tube in fig. 4 is located;
FIG. 6 is a side view of FIG. 4;
FIG. 7 is a schematic diagram of the turnover mechanism and conveyor belt in one embodiment of the present invention;
in the figure: 1. the device comprises a device shell, 2, a power supply console, 3, an exhaust pipe, 4, a discharge port, 5, a sieve plate, 6, a vibration pump, 7, an observation port, 8, a feeding bin, 9, an electrodeless ultraviolet lamp tube, 10, a conveyor belt, 11, a stepping motor, 12, a backflow exhaust fan, 13, a backflow pipe, 14, a solid microwave source, 15, a branch waveguide, 16, a scraper rotating wheel, 17, the conveyor belt, 18, a spring, 19, a frame, 20, a roller, 21, the stepping motor, 22, a driving gear, 23, a driving wheel, 24, a turnover wheel and 25, wherein the device shell is provided with a feeding hole, a feeding bin, a conveying belt, a stepping motor and a turnover chain; 26. microwave regular waveguide, 27 catalytic net, 28 collecting hood.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the continuous repair device for organic contaminated soil provided by the embodiment of the present invention includes a conveyor belt 10 for conveying soil to be repaired, the conveyor belt 10 is driven by a power component, the conveyor belt 10 is disposed in a housing 1, and is sequentially divided into a soil feeding region, an ozone water vapor reflux region, a variable frequency microwave thermal desorption region and a UV digestion region along a conveying direction of the soil, the inlet end of the housing 1 is provided with a feeding bin 8, the soil feeding region is disposed in the feeding bin 8, an air outlet of the ozone water vapor reflux region, the variable frequency microwave thermal desorption region and the UV digestion region are all disposed above the conveyor belt 10 and in an upper cavity of the housing 1, and the conveyor belt 10 is disposed in a microwave resonance cavity at a lower portion of the housing; the afterbody of casing 1 is equipped with discharge gate 4, the bottom of conveyer belt 10 still is equipped with the tilting mechanism that is used for the soil that overturns, can break up the soil upset of caking into granule soil at the continuous vibration conveyer belt in-process, prolongs the dwell time of soil on the conveyer belt, makes soil obtain fully restoreing. The technical scheme can realize the thorough restoration of the soil by simultaneously utilizing microwave thermal desorption, UV light digestion and ozone oxidation.
In the prior art, the soil is repaired by utilizing microwaves, the microwaves can only thermally desorb organic pollutants in the soil, the temperature of the non-gaseous organic pollutants attached in the soil layer is increased by the temperature of the soil layer, or the temperature of interstitial water heated by the microwaves is increased, so that the temperature of the attached organic pollutants is driven to be increased, and the organic pollutants are quickly vaporized to separate out the soil to reach the boiling point; if the organic pollutants are large molecules and complex, microwaves cannot directly act on the organic pollutants, the organic pollutants can only be desorbed out of soil thermally, and then the volatilized soil is further digested completely by ultraviolet light excited by the microwaves and is converted into small molecules without pollution to be discharged. Therefore, the microwave thermal desorption soil remediation is generally used as the pretreatment of soil remediation, and a polluted gas treatment device is additionally arranged in the follow-up process, so that the problem is well solved in a microwave resonant cavity by using the ultraviolet light combination mode of the microwave induction UV digestion area, and the soil remediation effect is improved.
In a specific embodiment of the present invention, as shown in fig. 1, 2, 4 and 5, the soil feeding zone is provided with a vibration pump 6 and a sieve plate 5, the sieve plate 5 is arranged at the top inlet of the feeding bin 8, a conveyer belt 17 connected with the conveyer belt 10 is arranged below the sieve plate 5, and the vibration pump 6 is arranged at the side surface of the sieve plate 5 and is used for driving the sieve plate 5 to vibrate, so that large organic contaminated soil is sieved into small particles and falls onto the conveyer belt 17 in the feeding bin 8. Wherein, the sieve plate is a sieve plate with a low aperture. Organic contaminated soil is because the unequal organic pollutant of concentration adheres to in the soil, it is very strong to glue the stickness between the soil, it is the large granule bonding state to appear more, consequently will pollute soil and empty on the soil sieve at feeding storehouse top, via the work of vibrating pump, make the sieve produce violent vibrations effect, the large granule organic contaminated soil sieve that the low aperture sieve will bond the form is divided into little graininess and drops to the feeding storehouse in, landing or fall the conveyer belt under the action of gravity, on the contaminated soil of little granule is transferred to the conveyer belt by the conveyer belt afterwards, inside the access device under the drive of conveyer belt.
Because the microwave resonant cavity is a closed working space, but the feeding bin needs a large amount of quick feeding, the feeding hole is large, which causes the microwave to leak out of the feeding hole, but the existence of the sieve plate with low aperture inhibits the generation of the phenomenon, the transmission path of the microwave is the reciprocating vibration transmission along the direction of the linear propagation path, and the movement mode indicates that the microwave can leak along the gap between the devices but can not leak along the fine hole, namely the principle that the microwave can not leak along the gap, namely the microwave can not leave the hole. The low-aperture sieve plate can sieve the large-particle organic contaminated soil in a bonding state into small-particle soil on one hand, and on the other hand, inhibits microwaves leaked from the feed inlet from escaping from the whole device.
During specific manufacturing, the sieve plate 5 is inclined by 15 degrees, and the angle is opposite to the direction of the conveyor belt; both sides of the sieve plate 5 are connected with a top frame 19 through springs 18, and the frames are arranged around an inlet of the feeding bin. Frame 19 drives the sieve vibrations through the spring under the oscillating pump drive, and the large granule soil of being more convenient for disperses for the tiny particle under gravity and sieve vibrations effect, and the tiny particle soil falls down from the sieve mesh, and large granule soil falls down under the action of gravity from the end of sieve, and the sieve passes through spring-supported outer no other support framework that does not have, and at the vibration in-process of oscillating pump, the vibration effect of sieve is stronger.
Further optimizing the above scheme, the conveyor belt 10 is provided with baffles at both sides thereof and inclined press wheels (not shown) at the bottoms of both sides thereof for making the conveyor belt in a concave-middle and high-side shape. Wherein, the conveyer belt is made by high temperature resistant high tenacity teflon material. Adopt this structure to make the central authorities indent of conveyer belt to with the help of the baffle of conveyer belt both sides, shelter from soil and prevent to drop.
In a specific embodiment of the present invention, as shown in fig. 4 and 6, the turnover mechanism includes three rollers 20 and a plurality of scrapers 16, the three rollers 20 are correspondingly disposed below the air outlet of the ozone water vapor reflux region, the frequency conversion microwave thermal desorption region and the UV digestion region, the plurality of scrapers 16 are radially and uniformly distributed on the surface of each roller 20, and the rollers corresponding to the air outlet of the ozone water vapor reflux region, the frequency conversion microwave thermal desorption region and the UV digestion region in sequence are the first, second and third; the three rollers 20 are connected by a transmission chain and driven by a power unit. The small organic particle contaminated soil enters the microwave resonant cavity along the concave conveying belt, the scraper continuously hits the bottom of the conveying belt, the soil on the conveying belt can be violently turned over, and the soil particles bonded again under the action of gravity during feeding are sieved into small particles again.
In the embodiment shown in fig. 7, the number of the scrapers on each roller is three, the three scrapers are spaced by 120 degrees, each time when a single scraper rotates to the highest position, the scraper can vibrate the conveyor belt upwards due to the toughness of the conveyor belt material, the flexible conveyor belt generates a downward vibration effect, and the small-particle soil carried by the conveyor belt passing through the scraper section can be returned to the bottom of the starting point by the vibrating screen under the vibration effect of the scraper and the conveyor belt, so that the retention time of the soil in the conveyor belt is greatly increased, and the soil is enabled to be violently stirred before passing over the scrapers. In the whole microwave resonant cavity interval, three rollers with scrapers are utilized, and the retention time, the turning frequency and the soil particle size of soil particles are increased at a pair of certain points under the air outlet of the ozone water vapor reflux area, the variable-frequency microwave thermal desorption area and the UV digestion area respectively.
As a preferable structure, as shown in fig. 7, the power component is a stepping motor 21, an output shaft of the stepping motor 21 is coaxially fixed with a driving gear 22, and the driving gear 22 is coaxially fixed with a driving wheel 23 of the conveyor belt 10 for driving the conveyor belt 10 to run; the driving gear 22 is meshed with the turnover wheel 24, the turnover wheel 24 drives three rollers 20 simultaneously through a transmission chain 25, and the scrapers 16 around the rollers 20 can intermittently jack up the conveyor belt 10 for conveying soil above the rollers. The three rollers and the conveyor belt are driven by the stepping motor at the same time, the rotation direction of the rollers with the scraper is opposite to the movement direction of the conveyor belt by adopting the structure, and soil conveyed by the conveyor belt can be thrown to the feeding direction by the scraper through elastic deformation of the conveyor belt when the scraper reversely scrapes the conveyor belt by means of the toughness of the conveyor belt.
In an embodiment of the present invention, as shown in fig. 3, the variable-frequency microwave thermal desorption region is provided with a variable-frequency solid-state microwave source 14, a coaxial transmission line, a microwave-structured waveguide 26 and a branch waveguide 15, the solid-state microwave source 14 is connected to the microwave-structured waveguide 26 through the coaxial transmission line, and the microwave-structured waveguide 26 radiates microwaves into the UV digestion region and the microwave resonant cavity through the branch waveguide 15, respectively. In view of the fact that the solid microwave source has stable and efficient microwave frequency conversion functions, microwaves generated during working are transmitted to the regular waveguide by the coaxial transmission line and then enter the branch waveguide, and the branch waveguide has two output ports: and the electrodeless ultraviolet lamp tube faces the microwave resonant cavity and the UV digestion area. The frequency conversion microwave heating is utilized, the optimal working frequency under various working conditions is selected, and compared with the microwave with the fixed frequency in the prior art, the microwave thermal desorption effect is stronger under the same microwave power.
The microwave generated in the frequency conversion microwave thermal desorption area is mainly used for performing thermal desorption on the organic contaminated soil, the temperature of the soil layer is rapidly increased by rapid heating of the microwave, the inner molecules of organic contaminated particles in the soil generate heat from inside to outside under the high-frequency resonance effect of the microwave, and simultaneously, under the combined action of heat conduction generated after rapid temperature rise of the temperature of the external soil layer, the organic contaminated particles are rapidly volatilized from vaporization and are separated out from thermal desorption among gaps of the adsorbed soil particles, namely, the microwave thermal desorption process. More important, the adjustable function of solid-state microwave source microwave frequency can produce the microwave of different frequencies, and the microwave of different frequencies has different wavelength and different microwave energy quantum, and the microwave frequency of change can be more deep pierce through whole soil particle, and stronger microwave energy quantum enables the more complicated organic matter that adsorbs in the soil to be desorbed by the resonance effect and volatilize, and under the effect of the backward flow air exhauster in top ozone steam backward flow district, the organic gas flow direction UV of volatilizing clears up the district. Meanwhile, in the same microwave resonant cavity, the variable frequency microwave has different wavelengths, which can cause the change of the propagation path of the microwave, so that different standing wave environments are generated in the resonant cavity, and the weakest frequency section of the generated standing wave environment is selected as the microwave working frequency through the adjustment of the frequency, thereby realizing more remarkable microwave thermal desorption effect under the same working power. The lower part of the microwave thermal desorption area corresponds to a second group of scrapers. In the same way, under the action of the rotary scraper, the retention time, the turnover frequency and the particle bonding state degree of soil particles are greatly improved.
As a preferable scheme, as shown in fig. 3 and 4, a catalytic net 27 and a plurality of electrodeless ultraviolet lamps 9 are arranged in the UV digestion region, a supported catalyst is coated on the catalytic net 27, and the plurality of electrodeless ultraviolet lamps 9 are arranged below the catalytic net 27 in parallel; the top of the catalytic net 27 is provided with an exhaust pipe 3, and an exhaust port of the exhaust pipe 3 extends to the outside of the casing 1. Wherein, the top of the catalytic net is provided with a collecting cover 28, which is convenient for collecting the discharged gas; the wavelength of the UV wave emitted by the electrodeless ultraviolet lamp tube 9 is 185nm; the supported catalyst is titanium dioxide taking silicon carbide as a carrier, the effect of the titanium dioxide heated by microwaves is not strong, the silicon carbide has strong adaptability to microwaves, the microwaves can heat the silicon carbide to a higher temperature in a short time, and the silicon carbide serving as the carrier can conduct heat to the titanium dioxide at the same time to enable the titanium dioxide to quickly reach catalytic activity.
In the above embodiment, the generation of the UV waves comes from that mercury-argon vapor inside the electrodeless ultraviolet lamp is ionized to a high-energy transition state due to the electromagnetic oscillation of the microwaves, and the electrodeless ultraviolet lamp radiates a large amount of UV waves when the high-energy transition state is converted to a normal state, and the whole process is that the microwaves induce the electrodeless ultraviolet lamp tube to generate the UV waves. The microwave is transmitted to the branch waveguide by the regular waveguide and then enters the electrodeless ultraviolet lamp tube from the front side. The wavelength of the UV wave generated by exciting the electrodeless ultraviolet lamp tube by microwave electromagnetic oscillation is 185nm, and the electrodeless ultraviolet lamp tube has stronger digestion capability on organic pollutants. The gaseous state organic matter that UV ripples and titanium dioxide photocatalyst produced microwave thermal desorption carries out rapid digestion effect, generates vapor and carbon dioxide and discharges from the top, and more important, UV produces electromagnetic oscillation along with the microwave, need not external electrode, produces along with microwave work, and the start-up is closed rapidly.
As a preferable scheme, as shown in fig. 3, the ozone water vapor reflux area is provided with a reflux pipe 13 and a reflux exhaust fan 12, the reflux exhaust fan 12 is arranged on the reflux pipe 13, an inlet of the reflux pipe 13 is connected with the exhaust pipe 3, and an outlet of the reflux pipe 13 is arranged above the conveyor belt 10 at the front side of the variable frequency microwave thermal desorption area. When the electrodeless ultraviolet lamp tube works, oxygen in the shell simultaneously generates partial ozone under the action of 185nm ultraviolet light, the ozone has strong oxidizability and has strong pollution to the environment, meanwhile, organic pollutants volatilized after microwave thermal desorption generate a large amount of gaseous water after the photocatalysis of UV and titanium dioxide, therefore, an ozone water vapor backflow area is arranged at the top, the backflow pipe 13 is connected with the collection cover 28, the digested tail gas is extracted and flows back by using a backflow exhaust fan, the ozone and the water vapor flow back to the first stage before the microwave thermal desorption area, and are discharged in front of a scraper of a first roller and directly face soil particles turned back by the scraper. Ozone has very strong oxidizing property, and organic pollutant is the reducing substance, under the ozone effect, adnexed organic pollutant in the soil granule at first carries out the redox effect with backward flow ozone, the part is handled by backward flow ozone effect, and simultaneously, the steam of backward flow is in reentrant soil granule, the upset effect with the help of rotatory scraper blade, the mixed effect between backward flow steam and the soil granule has more been strengthened, steam adsorbs in the soil granule, not only strengthened the moisture content of soil granule, the steam of squeezing into soil granule simultaneously equally can take place to adhere to with the organic pollution who adsorbs in the soil granule, steam adheres to organic pollutant, rather than mixing, dilute the organic pollutant who adsorbs in the soil granule, the adhesion concentration has been reduced. More important, the backward flow steam makes soil moisture content increase, soil particles's dielectric property is relatively poor, it is relatively weak to microwave adaptability, and water has very strong dielectric property, it is very strong to microwave adaptability, can very strong absorption microwave, consequently, soil particles moisture content increases the back, the microwave can produce stronger heat effect to its effect, the microwave produces more heat to more hydrone effects, the heat that the hydrone produced is again conducted to the soil horizon in, make its rapid heating up, produce higher temperature, whole result is, in microwave thermal desorption district, the microwave promotes higher temperature to soil horizon effect rapidly, more organic pollutant volatilize out in the soil more rapid follow.
During specific manufacturing, as shown in fig. 1, the solid-state microwave source, the electrodeless ultraviolet lamp tube, the backflow exhaust fan, the vibration pump and the stepping motor are all connected with a power supply console, and the power supply console is installed on the outer side of the shell and is convenient for controlling the on and off of each electric device.
The invention utilizes the solid microwave source to improve the microwave thermal desorption effect, because the solid microwave source is a novel microwave generating source with the performance superior to that of the traditional magnetron, the invention has the advantages of stable microwave emitting power, good heat dissipation effect, high working efficiency, long continuous working life and the like, more importantly, the solid microwave source can accurately control the incident frequency of the microwave, and meanwhile, the emitted microwave frequency can realize the adjustment frequency conversion within a certain range. Theoretically, when the frequency of the microwave is 2.45GHz, the wavelength of the microwave is 0.122m, and in the waveguide and the resonant cavity with the same size and configuration, the microwave in the 2.45GHz frequency band generates a propagation path in the waveguide and the resonant cavity, the propagation path includes the incidence of the microwave, the reflection of the microwave via the waveguide and the inner wall of the resonant cavity, and the standing wave generated by the interaction of the incident microwave and the reflected microwave, and the series of microwave propagation processes are all fixed by the microwave propagation path in the 2.45GHz frequency band, and meanwhile, the 2.45GHz also defines the magnitude of the microwave energy. However, if the microwave frequency is changed, the wavelength of the microwave is also changed, which results in a change of the original 2.45GHz propagation path in the resonant cavity and the waveguide, which results in a change of the incident condition and the reflection condition of the microwave in the waveguide and the resonant cavity, and a change of the standing wave generated by the interaction of the incident wave and the reflected wave, which finally results in a change of the heating effect of the microwave on the material originally at 2.45GHz, and a change of the microwave frequency results in a change of the microwave energy. Therefore, the change of the microwave frequency can intuitively reflect the change of the propagation path of the microwave, and further intuitively reflect the heating effect of the material.
In summary, the invention provides a microwave thermal desorption and UV tail gas digestion combined device for continuously repairing organic contaminated soil by using variable frequency microwaves, and provides a targeted solution for the soil overturning problem, the soil viscosity problem, the tail gas treatment and discharge problem and the microwave leakage problem, and the device has the following advantages:
1. the invention applies the variable frequency solid microwave source, applies the variable frequency microwave to the organic pollutant soil remediation, and adjusts the microwave frequency band with the best microwave heating effect in the work heating debugging.
2. According to the invention, the roller with the scraper is arranged below the variable-frequency microwave thermal desorption region, the UV digestion region and the ozone water vapor reflux region in the operation process of the conveyor belt, and the rotation direction of the roller is opposite to the movement direction of the conveyor belt, so that the effects of multiple turnover and multiple vibration of soil particles before passing through the scraper can be effectively increased, a better contact surface is provided with microwaves, and a more uniform mixing effect is provided with reflux water vapor.
3. According to the invention, ozone and water vapor are refluxed, the reflux port is arranged in front of the scraper of the first roller, soil is rolled and sieved repeatedly by virtue of the synergistic effect of the scraper and the toughness of the conveyor belt, the soil is fully contacted with the refluxed water vapor to improve the water content of the soil, the heating and temperature rising effect of subsequent microwaves is enhanced, and meanwhile, the water vapor and soil particles are fully mixed and adsorbed and are also adhered to organic pollutants of the particles, so that the concentration of the water vapor and the soil particles is diluted.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and thus the present invention is not limited to the specific embodiments disclosed above.
Claims (10)
1. The utility model provides a continuous prosthetic devices of organic contaminated soil which characterized in that: the soil remediation device comprises a conveyor belt used for conveying soil to be remedied, wherein the conveyor belt is driven by a power component, is arranged in a shell and is sequentially divided into a soil feeding area, an ozone water vapor backflow area, a variable-frequency microwave thermal desorption area and a UV digestion area along the conveying direction of the soil, a feeding bin is arranged at the inlet end of the shell, the soil feeding area is arranged in the feeding bin, an air outlet of the ozone water vapor backflow area, the variable-frequency microwave thermal desorption area and the UV digestion area are all arranged above the conveyor belt and are arranged in an upper cavity of the shell, and the conveyor belt is arranged in a microwave resonant cavity at the lower part of the shell; the afterbody of casing is equipped with the discharge gate, the bottom of conveyer belt still is equipped with the tilting mechanism that is used for turning soil.
2. The continuous remediation device for organically-polluted soil according to claim 1, wherein: soil feeding district is equipped with vibrating pump and sieve, the sieve sets up in the top import department in feeding storehouse, the below of sieve is the conveyer belt that links to each other with the conveyer belt, the vibrating pump sets up in the side of sieve for the vibration of drive sieve makes large granule organic pollution soil sieve divide into on the conveyer belt that the tiny particle form dropped in the feeding storehouse.
3. The continuous remediation device for organically-polluted soil according to claim 2, wherein: the sieve inclines for 15 degrees, the two sides of the sieve are connected with the top frame through springs, and the frames are arranged around the inlet of the feeding bin.
4. The continuous remediation device for organic contaminated soil according to claim 1, wherein: the two sides of the conveying belt are provided with baffles, and the bottoms of the two sides of the conveying belt are provided with inclined pressing wheels respectively, so that the conveying belt is in a shape with a concave middle and high two sides.
5. The continuous remediation device for organically-polluted soil according to claim 1, wherein: the turnover mechanism comprises three rollers and a plurality of scrapers, the three rollers are correspondingly arranged below the air outlet of the ozone water vapor reflux area, the variable-frequency microwave thermal desorption area and the UV digestion area, and the plurality of scrapers are radially and uniformly distributed on the surface of each roller; the three rollers are connected through a transmission chain and driven by a power component.
6. The continuous remediation device for organically-polluted soil according to claim 5, wherein: the power component is a stepping motor, an output shaft of the stepping motor is coaxially fixed with a driving gear, and the driving gear is coaxially fixed with a driving wheel of the conveyor belt and is used for driving the conveyor belt to run; the driving gear is meshed with the turnover wheel, the turnover wheel drives the three rollers simultaneously through the transmission chain, and the scrapers around the rollers can intermittently jack up the conveying belt conveying soil above the rollers.
7. The continuous remediation device for organically-polluted soil according to claim 1, wherein: the variable-frequency microwave thermal desorption region is provided with a variable-frequency solid microwave source, a coaxial transmission line, a microwave regular waveguide and a branch waveguide, the solid microwave source is connected with the microwave regular waveguide through the coaxial transmission line, and the microwave regular waveguide radiates microwaves towards the UV digestion region and the microwave resonant cavity through the branch waveguide respectively.
8. The continuous remediation device for organic contaminated soil according to claim 1, wherein: the UV digestion region is provided with a catalytic net and a plurality of electrodeless ultraviolet lamps, the catalytic net is coated with a supported catalyst, and the plurality of electrodeless ultraviolet lamps are arranged below the catalytic net in parallel; the top of the catalysis net is provided with an exhaust pipe, and an exhaust port of the exhaust pipe extends to the outside of the shell.
9. The continuous remediation device for organically-polluted soil according to claim 8, wherein: the supported catalyst is titanium dioxide taking silicon carbide as a carrier; the wavelength of the UV wave emitted by the electrodeless ultraviolet lamp tube is 185nm.
10. The continuous restoring apparatus for organic contaminated soil according to any one of claims 1 to 9, wherein: ozone steam backward flow district is equipped with back flow and backward flow air exhauster, the backward flow air exhauster sets up on the back flow, the import and the blast pipe of back flow link to each other, the gas outlet of back flow sets up in the conveyer belt top of frequency conversion microwave thermal desorption district front side.
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| CN117181797A (en) * | 2023-09-26 | 2023-12-08 | 河北科技大学 | Continuous organic contaminated soil restoration device |
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