CN212733546U - Integrated modular ex-situ direct thermal desorption system - Google Patents
Integrated modular ex-situ direct thermal desorption system Download PDFInfo
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- CN212733546U CN212733546U CN202020491556.6U CN202020491556U CN212733546U CN 212733546 U CN212733546 U CN 212733546U CN 202020491556 U CN202020491556 U CN 202020491556U CN 212733546 U CN212733546 U CN 212733546U
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Abstract
The utility model discloses a direct thermal desorption system of integral type modularization dystopy, including feeding band conveyer, drying kiln, cyclone, postcombustion chamber, half dry quench tower, sack cleaner, pickling tower and chimney. The utility model provides a direct thermal desorption system of dystopy, this system adopt integral type modularization overall arrangement, and adopt sled piece formula mounting means, mainly are applicable to large-scale soil restoration project. The utility model discloses an ectopic direct thermal desorption system of integral type modularization is applicable to the restoration in contaminated site such as soil, mud, precipitate, filter residue of volatility and semi-volatility organic pollutant, makes the soil after the restoration can recycle, is very much to handling some proruption organic pollution environmental accidents, like because the accident leaks, topples over the emergent restoration of the proruption soil pollution accident that takes place.
Description
Technical Field
The utility model relates to a soil remediation technical field, concretely relates to heterotopic direct thermal desorption system of integral type modularization.
Background
Thermal desorption is also called thermal desorption, and as a non-combustion technology, the method has the advantages of wide pollutant treatment range, movable equipment and capability of reusing the repaired soil, particularly, the method can avoid the generation of dioxin in the treatment mode of non-oxidative combustion of chlorine-containing organic matters, and is widely used for repairing the soil polluted by organic pollutants.
The existing thermal desorption equipment generally mainly depends on foreign import, and the investment cost is high. Some domestic thermal desorption processing systems have the following problems:
1. the site has large dust emission and serious secondary pollution because the sealing structure of the kiln body is not designed sufficiently, and the dust escapes from the joint of the kiln head and the kiln tail;
2. the equipment layout occupies a large area, and the equipment installation and field withdrawal periods are long. Because the project period of soil remediation treatment is short and the transition frequency is high, the occupied area of equipment is required to be as small as possible, and the time for installing and removing the equipment is required to be shortened as possible. Thus, current devices are not adequate.
3. Dioxin carcinogenic substances caused in the tail gas treatment of equipment are discharged into the atmosphere along with a chimney, so that the harm to a human body is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an integral type modularization dystopy direct thermal desorption system, this system can solve equipment area too big, installation, withdrawal cycle length, and equipment continuity operation, technical problem such as exhaust emissions is not up to standard can solve one of above-mentioned problem at least.
According to one aspect of the utility model, an integrated modularized ectopic direct thermal desorption system is provided, which comprises a feeding belt conveyer, a drying kiln, a cyclone dust collector, a secondary combustion chamber, a semi-dry quenching tower, a bag-type dust collector, an acid washing tower, a discharging belt conveyer and a chimney;
the feeding end of the feeding belt conveyor is communicated with the excavated polluted soil, the discharging end of the feeding belt conveyor is communicated with the feeding hole of the drying kiln, and the feeding belt conveyor is used for feeding the polluted soil into the drying kiln for heating thermal desorption;
a discharge hole of the drying kiln is communicated with a feed inlet of the spiral belt mixer, is used for recovering the properties of the desorbed soil and is discharged to a specified position through a discharge belt conveyor;
an exhaust port of the drying kiln is communicated with an air inlet of a cyclone dust collector and is used for conveying tail gas subjected to soil desorption treatment into the cyclone dust collector for gas-particle separation to remove large-particle dust in the tail gas;
an exhaust port of the cyclone dust collector is communicated with an air inlet of the secondary combustion chamber and is used for sending the separated tail gas into the secondary combustion chamber for high-temperature complete oxidation to generate harmless tail gas;
an exhaust port of the secondary combustion chamber is communicated with an air inlet of the semi-dry quenching tower and is used for sending the tail gas after high-temperature complete oxidation into the semi-dry quenching tower for rapid cooling so as to prevent harmful compounds containing dioxin from being generated by reduction again;
the exhaust port of the semi-dry quenching tower is communicated with the air inlet of the bag-type dust remover and is used for sending the quenched tail gas into the bag-type dust remover;
an exhaust port of the bag-type dust collector is communicated with an air inlet of the pickling tower through a first fan;
the exhaust port of the pickling tower is communicated with the air inlet of the chimney.
Therefore, the utility model provides a direct thermal desorption system of dystopy, this system adopt integral type modularization overall arrangement, and adopt sled piece formula mounting means, mainly are applicable to large-scale soil restoration project. The utility model discloses an ectopic direct thermal desorption system of integral type modularization is applicable to the soil of volatility and semi-volatility organic pollutant, mud, the precipitate, the restoration in pollution places such as filter residue, make the soil after the restoration recycle, be very much to handling some proruption organic pollution environmental accidents, if because the accident leaks, empty the emergent restoration of the proruption soil pollution accident that takes place, this system can accomplish swift processing, and can not cause secondary pollution, and structural design is compact, the transportation is convenient for being considered to the equipment size, the installation time shortens greatly, it is 20-30t/h to handle contaminated soil volume, can be incessant operation in succession, the field erection, dismantle about the time limit for a project 10 days, equipment operation safety is high.
In some embodiments, the chimney is disposed above the pickling column. Therefore, the occupied area can be effectively reduced.
In some embodiments, the integrated modular ex-situ direct thermal desorption system further comprises an injection device disposed between the exhaust port of the semi-dry quenching tower and the inlet port of the bag-type dust collector, the injection device being capable of injecting activated carbon and lime nitrate. Therefore, the activated carbon sprayed by the spraying device can absorb dioxin in tail gas quenched by the semi-dry quenching tower, and the lime nitrate can absorb acid gas and water vapor in the tail gas quenched by the semi-dry quenching tower, so that the service life of the shell of the bag-type dust collector is effectively prolonged.
In some embodiments, the injection device comprises a slaked lime material tank, an activated carbon material tank, a venturi mixer and a spiral injection pipe, wherein the discharge ends of the slaked lime material tank and the activated carbon material tank are jointly communicated with the feed inlet of the venturi mixer through corresponding star-shaped dischargers, one end of the venturi mixer is provided with an air inlet, the air inlet is communicated with a second fan, the other end of the venturi mixer is provided with an air outlet/material port communicated with one end of the spiral injection pipe, the other end of the spiral injection pipe is communicated to a flue gas pipeline in front of a bag-type dust remover, slaked lime in the slaked lime material tank and the activated carbon material tank, and activated carbon powder is injected into the venturi mixer through compressed air to be mixed with flue gas cooled by a semi-dry quenching. A small amount of dioxin possibly escapes and water vapor is brought into a rear-section system after the flue gas passes through the semi-dry quenching tower. In order to fully remove the dioxin and protect the filter bag and the bag shell of the bag-type dust remover. The utility model discloses set up injection apparatus, the slaked lime in slaked lime material jar and the active carbon material jar, active carbon powder spout into the venturi mixer through compressed air, then under the effect of second fan, spout the flue gas pipeline before the sack cleaner with the material in the venturi mixer in through the spiral jetting pipe and mix with the flue gas after the cooling of half dry quench tower, the dioxin in the active carbon absorption flue gas, acid gas and steam in the slaked lime absorption flue gas. The utility model discloses can effectively prolong the filter bag of sack cleaner and the life of sack casing, can also effectively avoid pasting the bag phenomenon because of the too big filter bag that leads to of steam produces.
In some embodiments, an ammonia atomizer is disposed within the secondary combustion chamber. From this, the aqueous ammonia atomizer can be two fluid aqueous ammonia atomizes into the water smoke granule with certain pressure with the aqueous ammonia through compressed air, covers in the room body cross section of postcombustion chamber, and tail gas produces chemical reaction through water smoke cross section and aqueous ammonia, generates nitrogen gas and water, effectively gets rid of the nitrogen oxide in the flue gas.
In some embodiments, an emergency discharging device is provided on the back flue of the secondary combustion chamber, the emergency discharging device includes a discharge port, the emergency discharging device is matched with the secondary combustion chamber, the discharge port of the emergency discharging device is closed when the secondary combustion chamber works normally, and the discharge port of the emergency discharging device is opened when the secondary combustion chamber is stopped abnormally. Therefore, the emergency discharge device can be matched with a conventional explosion vent for use, is safe and reliable, avoids the damage of high-temperature gas to subsequent equipment due to the fault shutdown of a system, and fully ensures the operation safety of the equipment.
In some embodiments, the emergency discharging device comprises a housing, a driving part, a power arm, a resistance arm and a sealing cover plate, wherein the housing is mounted in the secondary combustion chamber, the discharge port and the driving part are arranged in the housing, the driving end of the driving part is connected with the power arm, one end of the power arm is provided with a balancing weight, the other end of the power arm is fixedly connected to a rotating main shaft, the rotating main shaft is rotatably arranged in the housing, the rotating main shaft is also fixedly connected with one end of the resistance arm, the resistance arm is connected with the sealing cover plate, and the sealing cover; when the secondary combustion chamber normally works, the driving piece drives the power arm to rotate, the rotating main shaft and the resistance arm are driven to rotate in a reverse direction, and the resistance arm drives the sealing cover plate to compress the discharge port; when the secondary combustion chamber is abnormally shut down, the driving piece does not work, one end of the power arm descends due to the gravity of the balancing weight, the rotating main shaft and the resistance arm are driven to rotate towards the other direction, and the resistance arm drives the sealing cover plate to open the discharge port. Therefore, when the secondary combustion chamber works normally, the sealing cover plate is tightly attached to the discharge port under the driving of the driving piece, and gas is prevented from escaping to the atmosphere. When the postcombustion chamber is shut down abnormally, the driving piece is out of work, and the power arm can descend because of the gravity of balancing weight, presses the end sealing cover plate of resistance arm one end, and gaseous urgent discharge into the atmosphere from the discharge port avoids causing the potential safety hazard and hurts the staff and salvagees personnel.
In some embodiments, the filter bag of the bag-type dust collector is made of a PTFE + PTFE membrane. From this, the sack cleaner can effectively filter dusty tail gas, and after dusty tail gas got into the sack cleaner, the dust that the granule is big, the proportion is big fell into corresponding collection ash bucket because the effect of gravity subsides, and the gas that contains more tiny dust is when passing through the filter material, and the dust is detained, makes gas obtain purifying.
The utility model has the advantages that:
1. the utility model provides a direct thermal desorption system of dystopy, this system adopt integral type modularization overall arrangement, and adopt sled piece formula mounting means, mainly are applicable to large-scale soil restoration project. The utility model discloses an ectopic direct thermal desorption system of integral type modularization is applicable to the soil of volatility and semi-volatility organic pollutant, mud, the precipitate, the restoration in pollution places such as filter residue, make the soil after the restoration recycle, be very much to handling some proruption organic pollution environmental accidents, if because the accident leaks, empty the emergent restoration of the proruption soil pollution accident that takes place, this system can accomplish swift processing, and can not cause secondary pollution, and structural design is compact, the transportation is convenient for being considered to the equipment size, the installation time shortens greatly, it is 20-30t/h to handle contaminated soil volume, can be incessant operation in succession, the field erection, dismantle about the time limit for a project 10 days, equipment operation safety is high.
2. The injection device is arranged between the exhaust port of the semi-dry quenching tower and the air inlet of the bag-type dust collector, so that the service lives of the filter bag of the bag-type dust collector and the bag shell can be effectively prolonged, and the bag pasting phenomenon of the filter bag caused by excessive water vapor can be effectively avoided.
3. The emergency discharge device is arranged, so that damage of high-temperature gas to subsequent equipment due to system failure and shutdown can be effectively avoided, and the operation safety of the equipment is fully ensured.
Drawings
Fig. 1 is a schematic perspective view of an integrated modular ex-situ direct thermal desorption system according to the present invention;
fig. 2 is a schematic top layout view of the integrated modular ex-situ direct thermal desorption system shown in fig. 1;
FIG. 3 is a system block diagram of the integrated modular ex-situ direct thermal desorption system shown in FIG. 1;
fig. 4 is a schematic structural diagram of an injection device of the integrated modular ex-situ direct thermal desorption system shown in fig. 1;
fig. 5 is a schematic front view of an emergency discharge device of the integrated modular ex-situ direct thermal desorption system shown in fig. 1;
FIG. 6 is a schematic top view of the emergency drain of FIG. 5;
fig. 7 is a soil unearthing data table of soil after being repaired by the integrated modular ex-situ direct thermal desorption system of the utility model;
fig. 8 is the utility model discloses a detection result statistics table of chimney combustion gas of different position direct thermal desorption system of integral type modularization.
Reference numerals in FIGS. 1 to 8: 1-feeding belt conveyer; 2-drying the kiln; 3-cyclone dust collector; 4-a secondary combustion chamber; 5-an emergency drain; 6-semi-dry quenching tower; 7-a spraying device; 8-bag dust collector; 9-a first fan; 10-acid washing tower; 11-ribbon mixer; 12-a discharge belt conveyor; 13-a chimney; 71-slaked lime bucket; 72-activated carbon bucket; 73-a venturi mixer; 74-spiral blowing pipe; 75-a second fan; 51-a housing; 52-a drive member; 53-a power arm; 54-rotating the bearing block; 55-resistance arm; 56-sealing cover plate; 57-sand sealing; 58-a counterweight block; 59-rain hat; 50-rotating the main shaft; 511-a discharge port; 512-sealing ring; 513-a scaffold; 531-beam; 532-longitudinal beam; 561 flange plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1-6 schematically show an integrated modular ex-situ direct thermal desorption system according to an embodiment of the present invention.
As shown in fig. 1-6, the integrated modularized ectopic direct thermal desorption system comprises a feeding belt conveyor 1, a drying kiln 2, a cyclone dust collector 3, a secondary combustion chamber 4, a semi-dry quenching tower 6, a bag-type dust collector 8, an acid washing tower 10, a discharging belt conveyor 12 and a chimney 13.
The feeding end of the feeding belt conveyor 1 is communicated with the excavated polluted soil, the discharging end of the feeding belt conveyor 1 is communicated with the feeding hole of the drying kiln 2, and the feeding belt conveyor 1 is used for feeding the polluted soil into the drying kiln 2 for heating thermal desorption;
a discharge hole of the drying kiln 2 is communicated with a feed inlet of a spiral belt mixer 11 and is used for recovering the properties of the desorbed soil and discharging the soil to a specified position through a discharge belt conveyor 12;
an exhaust port of the drying kiln 2 is communicated with an air inlet of the cyclone dust collector 3 and is used for conveying tail gas subjected to soil desorption treatment into the cyclone dust collector 3 for gas-particle separation to remove large-particle dust in the tail gas;
an exhaust port of the cyclone dust collector 3 is communicated with an air inlet of the secondary combustion chamber 4 and is used for sending the separated tail gas into the secondary combustion chamber 4 for high-temperature complete oxidation to generate harmless tail gas;
an exhaust port of the secondary combustion chamber 4 is communicated with an air inlet of the semi-dry quenching tower 6 and is used for sending the tail gas after high-temperature complete oxidation into the semi-dry quenching tower 6 for rapid cooling so as to prevent harmful compounds containing dioxin from being generated by reduction again;
an exhaust port of the semi-dry quenching tower 6 is communicated with an air inlet of a bag-type dust remover 8 and is used for sending quenched tail gas into the bag-type dust remover 8;
an exhaust port of the bag-type dust collector 8 is communicated with an air inlet of the pickling tower 10 through a first fan 9;
the exhaust port of the pickling tower 10 is communicated with the air inlet of a chimney 13. The chimney 13 is disposed above the pickling tower 10. Therefore, the occupied area can be effectively reduced.
As shown in fig. 3 to 4, the integrated modular ex-situ direct thermal desorption system further includes an injection device 7. The injection device 7 is arranged between the exhaust port of the semi-dry quenching tower 6 and the air inlet of the bag-type dust remover 8. The injection device 7 can inject active carbon and lime nitrate. Therefore, the activated carbon injected by the injection device 7 can absorb dioxin in the tail gas quenched by the semi-dry quenching tower 6, and the lime nitrate can absorb acid gas and water vapor in the tail gas quenched by the semi-dry quenching tower 6, so that the service life of the shell 51 of the bag-type dust collector 8 is effectively prolonged.
The injection device 7 of the present embodiment includes a slaked lime tank 71, an activated carbon tank 72, a venturi mixer 73, and a spiral injection pipe 74. The discharge ends of the slaked lime material tank 71 and the activated carbon material tank 72 are communicated with the feed inlet of the Venturi mixer 73 through the corresponding star-shaped discharger 24. One end of the venturi mixer 73 is provided with an air inlet which is communicated with a second fan 75, the other end of the venturi mixer 73 is provided with an air outlet/material port communicated with one end of the spiral blowing pipe 74, and the other end of the spiral blowing pipe 74 is communicated to a flue gas pipeline in front of the bag-type dust collector 8. The slaked lime and the activated carbon powder in the slaked lime material tank 71 and the activated carbon material tank 72 are sprayed into the venturi mixer 73 through compressed air to be mixed with the flue gas cooled by the semi-dry quenching tower 44. The air duct formed between the air inlet and the air outlet/inlet of the venturi mixer 73 of the present embodiment passes through at least the feed inlets of the venturi mixer 73 corresponding to the slaked lime tank 71 and the activated carbon tank 72. The venturi mixer 73 feed inlet that the slaked lime charging bucket 71 corresponds is close to the position of venturi mixer 73 air intake, and the venturi mixer 73 feed inlet that the active carbon charging bucket 72 corresponds is close to the position of venturi mixer 73 air-out/material mouth for the active carbon is advanced to be gone into in sack cleaner 8 and is adsorbed dioxin. The second fan 75 may be a roots fan. A small amount of dioxin may escape and vapor may be brought into a rear-stage system after the flue gas passes through the semi-dry quenching tower 44. In order to fully remove the dioxin and protect the filter bag and the bag shell of the bag-type dust collector 8. The utility model discloses set up injection apparatus 7, the lime hydrate in lime hydrate material jar 71 and the active carbon material jar 72, active carbon powder spout venturi mixer 73 through compressed air, then under the effect of second fan 75, spray the flue gas pipeline before 8 sack cleaner with the flue gas mixture after the cooling through half dry quench tower 44 through spiral jetting pipe 74 with the material in venturi mixer 73, the dioxin in the active carbon absorption flue gas, the acid gas and the steam in the lime hydrate absorption flue gas. The utility model discloses can effectively prolong the filter bag of sack cleaner 8 and the life of sack casing, can also effectively avoid pasting the bag phenomenon because of the too big filter bag that leads to of steam produces.
An ammonia water atomizer is arranged in the secondary combustion chamber 4. The ammonia atomizer may be a two-fluid ammonia atomizer. The ammonia water atomizer of the present embodiment may be an ammonia water gun commonly used in the market. From this, the aqueous ammonia atomizer can utilize compressed air to atomize into the aqueous ammonia with certain pressure and spray into the water smoke granule and spout in postcombustion chamber 4, cover in the cross section of the chamber body, and the flue gas produces chemical reaction through water smoke cross section and aqueous ammonia, and the chemical equation is as follows:
4NH3+4NO+O2→4N2+6H2O；
4NH3+2NO+2O2→3N2+6H2O；
8NH3+6NO2→7N2+12H2O。
therefore, the utility model discloses a nitrogen oxide in the flue gas can effectively be got rid of to postcombustion chamber 4.
The pickling tower 10 of the present embodiment employs a vertical multi-layer packing exhaust gas absorption tower. Waste gas enters the waste gas absorption tower from a gas inlet on the side of the tower body, is quickly filled in the space of the gas inlet section under the power action of the first fan 9, and then uniformly rises to the first-stage filler absorption section through the flow equalizing section. On the surface of the packing, the acidic species in the gas phase chemically react with the basic species in the liquid phase. The reaction product oil (mostly soluble salts) flows with the absorption liquid into the lower sump. The incompletely absorbed waste gas continues to enter the first-stage spraying section. The absorption liquid is sprayed out from the uniformly distributed nozzles at high speed in the spraying section to form countless fine droplets which are fully mixed with the gas, contacted with the gas and continuously subjected to chemical reaction. The process of contacting the spraying section and the filling section is also the process of material heat and mass transfer. The sufficiency and stability of the process are ensured by controlling the flow rate and the retention time of the waste gas washing tower. For some acid gases with poor chemical activity, a certain amount of surfactant needs to be added into the absorption liquid. The uppermost part of the tower body is a demisting section, absorption liquid fog drops carried in the gas are removed, the treated clean air enters a chimney 13 from the other side of the waste gas absorption tower and is discharged into the atmosphere, the chimney 13 of the embodiment can be the chimney 13, and a CEMS monitoring system can be arranged on the chimney 13.
Soil after drying kiln 2 handles is carried to spiral shell area blender 11 through the spiral ash hoist of intercommunication drying kiln 2, soil after cyclone 3 handles is carried to spiral shell area blender 11 through the spiral ash hoist of intercommunication cyclone 3, soil after the sack cleaner 8 handles is carried to spiral shell area blender 11 through the spiral ash hoist of intercommunication sack cleaner 8, then add water mixing stirring in spiral shell area blender 11 jointly, the material after the misce bene discharges to the top of ejection of compact band conveyer 12 through the discharge end of spiral shell area blender 11, ejection of compact band conveyer 12 is carried the material to appointed material stacking point again.
As shown in fig. 1 to 2, an emergency discharge device 5 is provided in the back flue of the secondary combustion chamber 4. The emergency drain 5 includes a drain 511. The emergency discharge device 5 cooperates with the secondary combustion chamber 4: the discharge port 511 of the emergency discharger 5 is closed when the secondary combustion chamber 4 is normally operated, and the discharge port 511 of the emergency discharger 5 is opened when the secondary combustion chamber 4 is abnormally stopped. Therefore, the emergency discharge device 5 can be matched with a conventional explosion vent for use, is safe and reliable, avoids the damage of high-temperature gas to subsequent equipment due to the fault shutdown of a system, and fully ensures the operation safety of the equipment.
As shown in fig. 5 to 6, the emergency drain device 5 of the present embodiment includes a housing 51, a driving member 52, a power arm 53, a resistance arm 55, and a sealing cover 56. A housing 51 is mounted to the secondary combustion chamber 4, and a discharge port 511 and a driver 52 are provided to the housing 51. The discharge port 511 of the present embodiment is provided at the bottom of the housing 51, and the driving member 52 is provided on the side wall of the housing 51, and the driving member 52 of the present embodiment may be an air cylinder. The cylinder end of the driver 52 is connected to the body of a power arm 53. One end of the power arm 53 is provided with a counterweight 58, and the other end of the power arm 53 is fixedly connected to the rotating main shaft 50. The rotating main shaft 50 is rotatably provided to the housing 51. Both ends of the rotary main shaft 50 of the present embodiment are provided on the side wall of the housing 51 through rotary bearing blocks 54, and the rotary bearing blocks 54 are below the driver 52. The rotating main shaft 50 is further fixedly connected with one end of a resistance arm 55, the resistance arm 55 is connected with a sealing cover plate 56, and the sealing cover plate 56 is matched with the discharge port 511 for opening and closing. In the present embodiment, the sealing cover 56 is made of a refractory material.
When the driving member 52 and the corresponding compressor are powered on, the rod end of the driving member 52 acts to pull the power arm 53 tightly, the power arm 53 drives the rotating main shaft 50 and the resistance arm 55 to rotate in one direction (clockwise rotation), and the resistance arm 55 drives the sealing cover 56 to press the discharge port 511.
When the driving member 52 and the corresponding compressor are powered off and air is lost, the cylinder rod end of the driving member 52 does not act, one end of the power arm 53 descends due to the gravity of the counterweight 58, the power arm 53 drives the rotating main shaft 50 and the resistance arm 55 to rotate in the other direction (anticlockwise rotation), and the resistance arm 55 drives the sealing cover plate 56 to open the discharge port 511.
The cylinder of the driver 52 of the present embodiment is fixedly attached to the side wall of the housing 51 by the attachment bracket 513.
The inner edge of the discharge port 511 of the present embodiment is provided with a sealing ring 512, and the sealing ring 512 cooperates with the sealing cover plate 56 to seal the discharge port 511. The outer edge of the discharge opening 511 is provided with a sand seal 57, and a sealing ring 512 is inserted into the sand seal 57 from the side. The edge of the sealing cover 56 is provided with a ring of extending flanges 561, the flanges 561 of the sealing cover 56 are inserted into the sand seal 57 from above, blocking the escape of gas from the vent 511 to the atmosphere.
As shown in fig. 6, the power arm 53 of the present embodiment is composed of a pair of cross members 531 connected to the rotating main shaft 50 and a side member 532 connected between the cross members 531, and the cylinder end of the driver 52 is connected to the side member 532.
The top of the shell 51 is provided with a rain hat 59, and the rain hat 59 plays a role in preventing rain.
The working principle of the emergency drain device 5 of the present embodiment is:
when the secondary combustion chamber 4 works normally, the compressor supplies compressed air to the driving part 52, the driving part 52 pulls the power arm 53 to close, and the sealing cover plate 56 on the resistance arm 55 is tightly attached to the discharge port 511, so that the gas is prevented from escaping to the atmosphere.
When the secondary combustion chamber 4 is abnormally stopped (for example, when the field power supply and gas supply system fails), the driving part 52 is in a power-off and gas-loss state, the outer end of the power arm 53 descends due to the gravity of the counterweight block 58, the end sealing cover plate 56 at one end of the resistance arm 55 is pressed up, the flange plate 561 of the sealing cover plate 56 leaves from the sand seal 57, the discharge port 511 is further opened, and gas is emergently discharged into the atmosphere from the discharge port 511, so that potential safety hazards are avoided, and workers and rush-repair personnel are prevented from being injured.
The utility model provides a direct thermal desorption system of dystopy, this system adopt integral type modularization overall arrangement, and adopt sled piece formula mounting means, mainly are applicable to large-scale soil restoration project. The utility model discloses an ectopic direct thermal desorption system of integral type modularization is applicable to the soil of volatility and semi-volatility organic pollutant, mud, the precipitate, the restoration in pollution places such as filter residue, make the soil after the restoration recycle, be very much to handling some proruption organic pollution environmental accidents, if because the accident leaks, empty the emergent restoration of the proruption soil pollution accident that takes place, this system can accomplish swift processing, and can not cause secondary pollution, and structural design is compact, the transportation is convenient for being considered to the equipment size, the installation time shortens greatly, it is 20-30t/h to handle contaminated soil volume, can be incessant operation in succession, the field erection, dismantle about the time limit for a project 10 days, equipment operation safety is high.
As shown in fig. 7-8, in some soil remediation place, adopt the utility model discloses a direct thermal desorption system of integral type modularization dystopy carries out soil remediation, and the soil after the processing and the gas that discharges from chimney 13 are all up to standard.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (7)
1. The integrated modularized ex-situ direct thermal desorption system is characterized by comprising a feeding belt conveyor (1), a drying kiln (2), a cyclone dust collector (3), a secondary combustion chamber (4), a semi-dry quenching tower (6), a bag-type dust collector (8), an acid washing tower (10), a discharging belt conveyor (12) and a chimney (13);
the feeding end of the feeding belt conveyor (1) is communicated with excavated polluted soil, the discharging end of the feeding belt conveyor is communicated with the feeding hole of the drying kiln (2), and the feeding belt conveyor (1) is used for feeding the polluted soil into the drying kiln (2) for heating and thermal desorption;
a discharge hole of the drying kiln (2) is communicated with a feed inlet of a spiral belt mixer (11) and is used for recovering the properties of the desorbed soil and discharging the soil to a specified position through the discharge belt conveyor (12);
an exhaust port of the drying kiln (2) is communicated with an air inlet of the cyclone dust collector (3) and is used for conveying tail gas subjected to soil desorption treatment into the cyclone dust collector (3) for gas-particle separation to remove large-particle dust in the tail gas;
an exhaust port of the cyclone dust collector (3) is communicated with an air inlet of the secondary combustion chamber (4) and is used for sending the separated tail gas into the secondary combustion chamber (4) for high-temperature complete oxidation to generate harmless tail gas;
an exhaust port of the secondary combustion chamber (4) is communicated with an air inlet of the semi-dry quenching tower (6) and is used for sending the tail gas after high-temperature complete oxidation into the semi-dry quenching tower (6) for rapid cooling so as to prevent harmful compounds containing dioxin from being generated by reduction again;
an exhaust port of the semi-dry quenching tower (6) is communicated with an air inlet of the bag-type dust remover (8) and is used for sending quenched tail gas into the bag-type dust remover (8);
an exhaust port of the bag-type dust collector (8) is communicated with an air inlet of the pickling tower (10) through a first fan (9);
and the exhaust port of the pickling tower (10) is communicated with the air inlet of the chimney (13).
2. The integrated modular ex-situ direct thermal desorption system according to claim 1, wherein the chimney (13) is disposed above the pickling column (10).
3. The integrated modular ex-situ direct thermal desorption system according to claim 1, further comprising an injection device (7), wherein the injection device (7) is arranged between an exhaust port of the semi-dry quenching tower (6) and an air inlet of the bag-type dust collector (8), and the injection device (7) can inject activated carbon and lime nitrate.
4. The integrated modular ex-situ direct thermal desorption system according to claim 3, wherein the injection device (7) comprises a slaked lime material tank (71), an activated carbon material tank (72), a venturi mixer (73) and a spiral injection pipe (74), the discharge ends of the slaked lime material tank (71) and the activated carbon material tank (72) are communicated with the feed inlet of the venturi mixer (73) through corresponding star-shaped dischargers, one end of the venturi mixer (73) is provided with an air inlet, the air inlet is communicated with a second fan (75), the other end of the venturi mixer (73) is provided with an air outlet/material port communicated with one end of the spiral injection pipe (74), the other end of the spiral injection pipe (74) is communicated to a flue gas pipeline in front of the cloth bag (8), and slaked lime dust collectors in the slaked lime material tank (71) and the activated carbon material tank (72) are, The activated carbon powder is sprayed into a Venturi mixer (73) through compressed air and is mixed with the flue gas cooled by the semi-dry quenching tower (6).
5. The integrated modular ex-situ direct thermal desorption system according to claim 1, characterized in that an ammonia atomizer is arranged inside the secondary combustion chamber (4).
6. The integrated modular ex-situ direct thermal desorption system according to any one of claims 1 to 5, wherein an emergency discharge device (5) is arranged on a back flue of the secondary combustion chamber (4), the emergency discharge device (5) comprises a discharge port (511), the emergency discharge device (5) is matched with the secondary combustion chamber (4), the emergency discharge device (5) closes the discharge port (511) when the secondary combustion chamber (4) works normally, and the emergency discharge device (5) opens the discharge port (511) when the secondary combustion chamber (4) is stopped abnormally.
7. The integrated modular ex-situ direct thermal desorption system of claim 6, the emergency discharge device (5) comprises a shell (51), a driving piece (52), a power arm (53), a resistance arm (55) and a sealing cover plate (56), the housing (51) is mounted on the secondary combustion chamber (4), the discharge port (511) and the driving member (52) are arranged on the housing (51), the driving end of the driving part (52) is connected with a power arm (53), one end of the power arm (53) is provided with a balancing weight (58), the other end is fixedly connected on the rotating main shaft (50), the rotating main shaft (50) is rotatably arranged on the shell (51), one end of a resistance arm (55) is fixedly connected to the rotating main shaft (50), a sealing cover plate (56) is connected to the resistance arm (55), and the sealing cover plate (56) is matched with the discharge port (511);
when the secondary combustion chamber (4) works normally, the driving piece (52) works, the driving piece (52) drives the power arm (53) to rotate, the rotating main shaft (50) and the resistance arm (55) are driven to rotate in the opposite direction, and the resistance arm (55) drives the sealing cover plate (56) to press the discharge port (511);
when the secondary combustion chamber (4) is abnormally shut down, the driving part (52) does not work, one end of the power arm (53) descends due to the gravity of the balancing weight (58), the rotating main shaft (50) and the resistance arm (55) are driven to rotate towards the other direction, and the resistance arm (55) drives the sealing cover plate (56) to open the discharge port (511).
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| CN202020491556.6U CN212733546U (en) | 2020-04-07 | 2020-04-07 | Integrated modular ex-situ direct thermal desorption system |
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| CN202020491556.6U CN212733546U (en) | 2020-04-07 | 2020-04-07 | Integrated modular ex-situ direct thermal desorption system |
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