CN203265252U - Device for restoration of soil polluted by persistent organic pollutants - Google Patents

Device for restoration of soil polluted by persistent organic pollutants Download PDF

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Publication number
CN203265252U
CN203265252U CN 201320296838 CN201320296838U CN203265252U CN 203265252 U CN203265252 U CN 203265252U CN 201320296838 CN201320296838 CN 201320296838 CN 201320296838 U CN201320296838 U CN 201320296838U CN 203265252 U CN203265252 U CN 203265252U
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China
Prior art keywords
soil
spray column
thermal desorption
inert gas
combustion system
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Withdrawn - After Issue
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CN 201320296838
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Chinese (zh)
Inventor
李晓东
陆胜勇
马增益
严建华
陈彤
祁志福
刘洁
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model relates to a polluted soil restoration technology, aims to provide a device for restoration of soil polluted by persistent organic pollutants. The device comprises a sorting machine, a hopper, a feeder and an indirect heating thermal desorption device, which are connected in sequence, wherein a soil discharge device is arranged at the bottom of the indirect heating thermal desorption device; a combustion system, a waste-heat utilization device and an inert gas generator are respectively connected with the indirect heating thermal desorption device; the combustion system is connected with an outer barrel; the inert gas generator is connected with an inner barrel; a tail gas treatment component comprises a cyclone dust collector, a primary spray tower, a secondary adjusting spray tower, a dehumidifier, a plasma reactor, an air filter, a draught fan and an exhaust funnel, which are connected in sequence. The device for restoration of soil polluted by persistent organic pollutants provided by the utility model has less treated flue gas amount and low water consumption, the persistent organic pollutants can be removed completely, and the operation cost is reduced by 30-60%; the device can effectively and economically treat the soil polluted by the persistent organic pollutants.

Description

Be used for the device that the persistence organic pollutant contaminated soil is repaired
Technical field
The utility model relates to a cover persistence organic pollutant contaminated soil prosthetic device, by the indirect thermal desorption system, with the Persistent Organic Pollutants in Soil desorption out, and by vent gas treatment parts such as cyclone dust collectors, two-stage spray column, plasma reactors, persistence organic pollutant is captured or degraded, belong to field of Environment Protection.
Background technology
Persistence organic pollutant (Persistent Organic Pollutants, be called for short POPs) has high toxicity, persistence, is easy to assemble in vivo and grows the characteristics such as the migration of distance and deposition, and part POPs also has carcinogenicity and teratogenesis.Main POPs has dioxin, Polychlorinated biphenyls, organo-chlorine pesticide, hexachloro-benzene etc.China has a large amount of soil to suffer the persistence organic pollutant pollution, as the Polychlorinated biphenyls of power industry use, the agrochemical that agricultural production is used.Along with the public to its progressively understanding to environment and health hazard, exigence economy and effective ways are processed these toxicants more.
The recovery technique of main persistence organic pollutant contaminated soil has biological restoration, chemistry reparation, physics reparation etc.Biological restoration mostly is the original position reparation, its investment is little, operating cost is low, operating condition is gentle, little to environmental disturbances, but the biological restoration cycle is long, and is subject to plant or microbe species, only can process the persistence organic pollutant of some particular types, and can only be applied under the low concentration condition; Physics reparation or chemistry are repaired and mostly to be showering, and initial outlay is large, operating cost is high, but repairing efficiency is short, and are applicable to various types of persistence organic pollutants and high density pollution place.Physics reparation or chemistry reparation have applicability widely, are specially adapted to high concentration, multicomponent persistency organic contaminant contaminated site.
In numerous physics reparations or chemical recovery technique, thermal desorption is to generally acknowledge the mature and reliable technology of processing high PCBs contaminated soil, is to be widely used in POPs contaminated site recovery technique most.When the main method of pre-treatment persistence organic pollutant is burning method.The major defect of burning method has two: one, the burning facility complex structure, and construction cost is high, and operating cost is high, does not possess good economy in the higher situation of current energy prices; The 2nd, part technique exists purification efficiency not high, easily produces the problem of secondary pollution; These have all limited the scope of application and the large-scale promotion of burning method.
According to the character of persistence organic pollutant, this patent has proposed cover persistence organic pollutant contaminated soil restorative procedure and a device.
The utility model content
The technical problems to be solved in the utility model is, overcomes deficiency of the prior art, and a kind of persistence organic pollutant contaminated soil prosthetic device is provided.
Be the technical solution problem, solution of the present utility model is:
A kind of device for the reparation of persistence organic pollutant contaminated soil is provided, comprises the separator, hopper, batcher and the indirect thermal desorption device that connect successively, the soil tapping equipment is connected to the bottom of heat hot desorption device; Described indirect thermal desorption device is the jacket type rotary kiln, comprises inner core and urceolus, arranges on inner tube wall that fin is to promote heat transfer; This device also comprises: combustion system, residual heat using device, inert gas generator and vent gas treatment parts; Described combustion system, residual heat using device and inert gas generator connect respectively indirect thermal desorption device; Combustion system is connected with urceolus, and the hot flue gas that produces enters urceolus and incorgruous with the soil movement direction; Inert gas generator is connected with inner core, and the inert gas that produces enters in inner core and moves in the same way with soil; Described vent gas treatment parts comprise successively cyclone dust collectors, one-level spray column, secondary adjustable type spray column, dehumidifier, plasma reactor, air cleaner, air-introduced machine and the aiutage that connects, and wherein one-level spray column and secondary adjustable type spray column also are connected with the effluent purifying EGR respectively.
In the utility model, described batcher is paddle feeder, is provided with heater block in blade.
In the utility model, described residual heat using device is the full film type wall heat-exchanger rig.
In the utility model, described cyclone dust collectors are provided with external heating device.
In the utility model, described one-level spray column and secondary adjustable type spray column are packed tower.
In the utility model, described dehumidifier is the heating and dehumidification device.
In the utility model, described plasma reactor is made of 2~8 grades of cutter type electrode gliding arc discharge generator series connection.
Device in the utility model is used for the method that the persistence organic pollutant contaminated soil is repaired, and comprises the following steps:
Separator carries out sorting to the persistence organic pollutant contaminated soil, and particle diameter is trapped greater than the soil particle of 20mm, and particle diameter enters hopper less than the soil particle of 20mm; Then soil enters the paddle feeder that is provided with heater block with fixed rate, and soil is heated to 120~140 ℃ when advancing; After the soil contained humidity is evaporated, enter indirect thermal desorption device; Indirect thermal desorption device is the jacket type rotary kiln, is furnished with fin on the wall of its inner core to promote heat transfer; The high-temperature flue gas of 1100~1300 ℃ that combustion system produces flows through from the urceolus of jacket type rotary kiln, and and the soil movement opposite direction; Inert gas generator produces the inner core that inert gas enters the jacket type rotary kiln, and identical with the soil movement direction; Soil is heated to 300~600 ℃ in the jacket type rotary kiln, contained persistence organic pollutant out and by inert gas is carried by desorption; After thermal desorption is processed, the persistence organic pollutant more than 99.9% by desorption out, the soil of cleaning is discharged by the soil tapping equipment; After the high-temperature flue gas that combustion system produces leaves the urceolus of jacket type rotary kiln, enter the residual heat using device heat exchange, flue-gas temperature is down to 50~100 ℃; Carry the inert gas of persistence organic pollutant first through being heated to the cyclone dust collectors dedusting more than 300 ℃, preventing persistence organic pollutant condensation in dust removal process; After cyclone dust removal, the particle in flue gas more than 90% is captured, and the particle of capture is recycled to hopper; Flue gas after dedusting enters one-level spray column and secondary adjustable type spray column, and by spraying cooling; After spray is processed, flue-gas temperature is down to 50~70 ℃, persistence organic pollutant in flue gas more than 95% is condensed and enters the effluent purifying EGR with spray liquid, and the fine grained that is not captured by cyclone dust collectors also enters the effluent purifying EGR with spray liquid; After sedimentation and filtration, the particle in waste liquid and oiliness persistent organism pollutant are separated and be made into filter cake in the effluent purifying EGR, and the clear liquid after filtration turns back in one-level spray column and secondary adjustable type spray column recycling; Flue gas after spray is processed enters dehumidifier, and is heated to 110~130 ℃ to remove steam; Flue gas after dehumidifying enters the plasma reactor that cutter type electrode gliding arc discharge generator series connection consists of, and reacts with high energy electron and the active group of discharge generation, realizes the degraded of persistence organic pollutant; After plasma reactor was processed, the persistence organic pollutant in flue gas more than 99.5% is fallen was decomposed into harmless little molecule, and the flue gas after processing is delivered to the aiutage discharging by air-introduced machine after air cleaner filters.
In the method, the voltage at described plasma reactor two ends is 10KV, and the progression of cutter type electrode gliding arc discharge generator is 6 grades.
In the utility model, the relation in described combustion system between firing rate and soil amount represents with following formula:
Wherein, M FuelBe combustion system Fuel Consumption per hour, M SoilFor indirect thermal desorption device is per hour processed soil amount, C SoilFor specific heat capacity is held, Δ T SoilBe the temperature value that soil raises, Q in indirect thermal desorption device FuelBe every kilogram of fuel value, η HeatBe the combustion system thermal efficiency.
In the utility model, the pouring liquid consumption of described one-level spray column or secondary adjustable type spray column and the relation between exhaust gas volumn represent with following formula:
Wherein, Q Spray liquidBe per hour one-level spray column or secondary adjustable type spray column spray liquid consumption, Q Flue gasFor per hour entering one-level spray column or secondary adjustable type spray column flue gas volume, C Flue gasBe the flue gas specific heat capacity, Δ T Flue gasThe temperature value that reduces in one-level spray column or secondary adjustable type spray column for flue gas; C Spray liquidBe the spray liquid specific heat capacity, Δ T Spray liquidThe temperature value that raises in one-level spray column or secondary adjustable type spray column for spray liquid.
In the utility model, the power match of described air-introduced machine represents with following formula:
Wherein, P Air-introduced machineBe air-introduced machine power, Q Air quantityBe air-introduced machine air inducing amount per hour, Δ P is that the full blast of air-introduced machine is pressed, η Blower fanBe the internal efficiency of air-introduced machine, η TransmissionBe machinery driving efficiency.
Compared with prior art, the beneficial effects of the utility model are:
Persistence organic pollutant contaminated soil restorative procedure of the present utility model and device, it is comprised of thermal desorption body and vent gas treatment parts, integrate indirect thermal desorption, cyclone dust removal, two-stage spray, plasma reaction technology, can effectively process the persistence organic pollutant contaminated soil, be specially adapted to high concentration, multicomponent persistence organic pollutant contaminated soil site remediation; Adopt indirect thermal desorption device, reduced the exhaust gas volumn that needs processing; Employing has the inner tube structure design of inner rib plate, and hot flue gas and the incorgruous motion of soil of combustion system generation have simultaneously promoted the heat exchange of flue gas and soil, have increased heat transfer efficiency; Adopt residual heat using device, take full advantage of the combustion system fume afterheat, improved the whole thermal efficiency; Employing prevents the condensation of persistence organic pollutant with the cyclone dust collectors of external heating device, removes coarse granule in flue gas, and the dust that cyclone dust collectors capture is returned to hopper passes through again the indirect thermal desorption system; The needed water major part of one-level spray column and secondary adjustable type spray column recycles, and has reduced the system water consumption; Adopted the multiple plasma reactor, the persistence organic pollutant after the spray of can fully degrading in tail gas.For the persistence organic pollutant contaminated soil, this device can be realized the persistence organic pollutant removal efficient more than 99.5%, and in the rear flue gas of processing simultaneously, persistence organic pollutant content far below national standard, can directly discharge.Persistence organic pollutant contaminated soil restorative procedure of the present utility model and device, it needs, and the smoke treatment amount is few, the water consumption is low, persistence organic pollutant is removed thoroughly, operating cost is low by 30~60%, can cost-effective processing persistence organic pollutant contaminated soil.
Description of drawings
Fig. 1 is process flow diagram of the present utility model.
Reference numeral in figure: 1 separator, 2 hoppers, 3 batchers, 4 indirect thermal desorption devices, 5 soil tapping equipments, 6 combustion systems, 7 inert gas generators, 8 cyclone dust collectors, 9 one-level spray columns, 10 secondary adjustable type spray columns, 11 effluent purifying EGRs, 12 dehumidifiers, 13 plasma reactors, 14 air cleaners, 15 air-introduced machines, 16 aiutages, 17 residual heat using device.
The specific embodiment
With reference to above-mentioned accompanying drawing, technology contents of the present utility model is described in detail.Heavy line signal soil movement direction in figure, the fine line signal spray liquid direction of motion, dotted line signal gas motion direction.
Fig. 1 provides cover persistence organic pollutant contaminated soil restorative procedure and a device, be comprised of thermal desorption body and vent gas treatment parts, the thermal desorption body comprises separator 1, hopper 2, batcher 3, indirect thermal desorption device 4, soil tapping equipment 5, inert gas generator 7, combustion system 6; The vent gas treatment parts comprise cyclone dust collectors 8, one-level spray column 9, secondary adjustable type spray column 10, effluent purifying EGR 11, dehumidifier 12, plasma reactor 13, air cleaner 14, air-introduced machine 15, aiutage 16; Hopper 2 connects batcher 3, and batcher 3 connects indirect thermal desorption device 4, and inert gas generator 6 connects indirect thermal desorption device 4, and combustion system 7 connects indirect thermal desorption device 4; Combustion system 6 connects residual heat using device 17; Indirect thermal desorption device 4 connects cyclone separator 8, cyclone separator 8 connects one-level spray column 9, one-level spray column 9 connects secondary adjustable type spray column 10, one-level spray column 9 is connected with secondary adjustable type spray column and is connected effluent purifying EGR 11, secondary adjustable type spray column 11 connects dehumidifier 12, and dehumidifier 12 connects plasma reactor 13, and plasma reactor 13 connects air cleaner 14, high efficiency particle air filter 14 connects air-introduced machine 15, and air-introduced machine 15 connects aiutage 16.
The persistence organic pollutant contaminated soil is after separator 1, particle diameter is trapped greater than the soil particle of 20mm, particle diameter enters hopper 2 less than the soil particle of 20mm, then soil enters paddle feeder 3 with fixed rate, there is thermal source blade inside, and soil advances with blade, and is heated to 120~140 ℃, soil moisture is evaporated, and in soil, persistent organism is few at this temperature desorption; After transpiring moisture, soil enters indirect thermal desorption device 4, it is the inner core of jacket type rotary kiln, the high-temperature flue gas of 1100~1300 ℃ that combustion system 6 produces flows through at the urceolus of jacket type rotary kiln, and and soil movement opposite direction, inert gas generator 7 produces inert gas in the inner core motion of jacket type rotary kiln, and identical with the soil movement direction, and jacket type rotary kiln inner core inwall is furnished with fin to promote heat transfer.Soil moves and is heated 300~600 ℃ at jacket type rotary kiln inner core, Persistent Organic Pollutants in Soil by desorption out, and the inert gas that is produced by inert gas generator 7 carries.After thermal desorption is processed, the persistence organic pollutant 99.9% or more by desorption out, the soil of cleaning is by 5 discharges of soil tapping equipment, the inert gas that is carrying persistence organic pollutant enters the vent gas treatment parts.After the high-temperature flue gas that combustion system 6 produces leaves the urceolus of jacket type rotary kiln, enter residual heat using device 17 recovery waste heats.At first the tail gas that is carrying persistence organic pollutant pass through cyclone dust collectors 8 dedustings with external heating device, and cyclone dust collectors 8 are heated to more than 300 ℃, to prevent persistence organic pollutant condensation in dust removal process.After cyclone dust collectors 8, the particle in flue gas more than 90% is captured, and the particle of capture is recycled to hopper 2, and the flue gas after dedusting enters one-level spray column 9 and secondary adjustable type spray column 10 thereafter, and by spraying cooling.After spray is processed, flue-gas temperature is down to 50~70 ℃, persistence organic pollutant in flue gas more than 95% is condensed and enters effluent purifying EGR 11 with spray liquid, and the fine grained that is not captured by cyclone dust collectors 8 in flue gas also enters effluent purifying EGR 11 with spray liquid.At effluent purifying EGR 11, after sedimentation and filtration, the particle in waste liquid and oiliness persistent organism pollutant are separated and be made into filter cake, and one-level spray column 9 got back to by the rear clear liquid of filtration and secondary adjustable type spray column 10 is interior recycling.Flue gas after spray enters dehumidifier 12, and is heated to 110~130 ℃ of steam to go out in flue gas.Flue gas after dehumidifying enters the plasma reactor 13 that the series connection of multistage cutter type electrode gliding arc discharge generator consists of, and reacts with a large amount of high energy electrons and the active group of discharge generation, realizes the degraded of persistence organic pollutant.According to actual needs, plasma reactor 13 both end voltage are 10KV, cutter type electrode gliding arc discharge generator progression is 6 grades, after plasma reactor processes 13, persistence organic pollutant in flue gas more than 99.5% is fallen is decomposed into harmless little molecule, flue gas after processing is delivered to aiutage 16 dischargings by air-introduced machine 15 after air cleaner 14 filters.
Relation in combustion system 6 between firing rate and soil amount represents with following formula:
Wherein, M FuelBe combustion system Fuel Consumption per hour, M SoilFor indirect thermal desorption device is per hour processed soil amount, C SoilFor specific heat capacity is held, Δ T SoilBe the temperature value that soil raises, Q in indirect thermal desorption device FuelBe every kilogram of fuel value, η HeatBe the combustion system thermal efficiency.
In the utility model, described one-level spray column spray 9 or the pouring liquid consumption of secondary adjustable type spray column 10 and the relation between exhaust gas volumn represent with following formula:
Wherein, Q Spray liquidBe per hour one-level spray column 9 or secondary adjustable type spray column 10 spray liquid consumptions, Q Flue gasFor per hour entering one-level spray column 9 or secondary adjustable type spray column 10 flue gas volume, C Flue gasBe the flue gas specific heat capacity, Δ T Flue gasBe the temperature value of flue gas in one-level spray column 9 or the 10 interior reductions of secondary adjustable type spray column; C Spray liquidBe the spray liquid specific heat capacity, Δ T Spray liquidBe the temperature value of spray liquid in one-level spray column 9 or the 10 interior risings of secondary adjustable type spray column.
In the utility model, the power match of described air-introduced machine 15 represents with following formula:
Wherein, P Air-introduced machineBe air-introduced machine power, Q Air quantityBe air-introduced machine air inducing amount per hour, Δ P is that the full blast of air-introduced machine is pressed, η Blower fanBe the internal efficiency of air-introduced machine, η TransmissionBe machinery driving efficiency.
After above process, the persistence organic pollutant in soil and flue gas all is effectively controlled, and reaches good soil remediation effect.
At last, note also that, what more than enumerate is only a specific embodiment of the present utility model.Obviously, this is bright is not limited to above embodiment, and a lot of distortion can also be arranged.Those of ordinary skill in the art can from all distortion that the disclosed content of the utility model directly derives or association goes out, all should think protection domain of the present utility model.

Claims (4)

1. be used for the device that the persistence organic pollutant contaminated soil is repaired, comprise the separator, hopper, batcher and the indirect thermal desorption device that connect successively, the soil tapping equipment is connected to the bottom of heat hot desorption device; It is characterized in that, described indirect thermal desorption device is the jacket type rotary kiln, comprises inner core and urceolus, arranges on inner tube wall that fin is to promote heat transfer; This device also comprises: combustion system, residual heat using device, inert gas generator and vent gas treatment parts; Described combustion system, residual heat using device and inert gas generator connect respectively indirect thermal desorption device; Combustion system is connected with urceolus, and the hot flue gas that produces enters urceolus and incorgruous with the soil movement direction; Inert gas generator is connected with inner core, and the inert gas that produces enters in inner core and moves in the same way with soil; Described vent gas treatment parts comprise successively cyclone dust collectors, one-level spray column, secondary adjustable type spray column, dehumidifier, plasma reactor, air cleaner, air-introduced machine and the aiutage that connects, and wherein one-level spray column and secondary adjustable type spray column also are connected with the effluent purifying EGR respectively.
2. device according to claim 1, is characterized in that, described batcher is paddle feeder, is provided with heater block in blade; Described residual heat using device is syntype wall heat-exchanger rig.
3. device according to claim 1, is characterized in that, described cyclone dust collectors are provided with external heating device; Described one-level spray column and secondary adjustable type spray column are packed tower; Described dehumidifier is the heating and dehumidification device.
4. device according to claim 1, is characterized in that, described plasma reactor is made of 2~8 grades of cutter type electrode gliding arc discharge generator series connection.
CN 201320296838 2013-05-27 2013-05-27 Device for restoration of soil polluted by persistent organic pollutants Withdrawn - After Issue CN203265252U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103272838A (en) * 2013-05-27 2013-09-04 浙江大学 Method and device for repairing contaminated soil with persistent organic pollutants
CN104307862A (en) * 2014-09-03 2015-01-28 中科华南(厦门)环保有限公司 Waste heat utilization system using thermal desorption high temperature cycle spray wastewater to improve normal temperature desorption booth processing efficiency
CN105983571A (en) * 2016-06-30 2016-10-05 无锡市太湖湖泊治理有限责任公司 Polluted soil repairing system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103272838A (en) * 2013-05-27 2013-09-04 浙江大学 Method and device for repairing contaminated soil with persistent organic pollutants
CN104307862A (en) * 2014-09-03 2015-01-28 中科华南(厦门)环保有限公司 Waste heat utilization system using thermal desorption high temperature cycle spray wastewater to improve normal temperature desorption booth processing efficiency
CN104307862B (en) * 2014-09-03 2016-09-07 中科华南(厦门)环保有限公司 A kind of thermal desorption high temperature circulation spent shower water improves the bootstrap system of normal temperature desorption booth treatment effeciency
CN105983571A (en) * 2016-06-30 2016-10-05 无锡市太湖湖泊治理有限责任公司 Polluted soil repairing system

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