CN105983570A - Electromagnetic thermal desorption remediation method and device used for remediating contaminated sites - Google Patents
Electromagnetic thermal desorption remediation method and device used for remediating contaminated sites Download PDFInfo
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- CN105983570A CN105983570A CN201510070842.9A CN201510070842A CN105983570A CN 105983570 A CN105983570 A CN 105983570A CN 201510070842 A CN201510070842 A CN 201510070842A CN 105983570 A CN105983570 A CN 105983570A
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Abstract
The invention provides an electromagnetic thermal desorption device used for remediating contaminated sites. Contaminated soil is heated, stirred and conveyed in a ferromagnetic material stirring device and a tank body through electromagnetism. Through heating the contaminated soil in the device, the thermal desorption heat transfer property and the organic pollutant separating effect are improved. The electromagnetic thermal desorption device comprises a material conveying device, an electromagnetic heating device and an exhaust gas treating and purifying device, wherein the electromagnetic heating device comprises an excitation controller, a heating coil, a thermal insulating material, a heating and conveying device, a temperature probe, a circulating water cooler and the like; and the exhaust gas treating and purifying device comprises an exhaust gas collecting pipe, a dust precipitator, a condenser, a collector, a catalytic oxidation device and the like. For heavy metal, low-melting-point glass powder and natural mirabilite powder are added, glassy substances are formed after temperature is raised through heating, the glassy substances solidify, and heavy metal pollutants are eliminated. The electromagnetic thermal desorption device has the characteristics of high heating speed, high heat transfer effect and small exhaust gas output. The size of a system is small, a moving treatment platform can be integrated, and integral transporting in-situ operation is realized.
Description
Technical field
The present invention relates to contaminated site recovery technique field, in particular relate to one and added by electromagnetic heating technique
Thermal pollution soil or mud therefrom separate in the environment restoring method of pollutant and device.
Background technology
With the quickening of China's industrialization and urbanization process, the adjustment of urban planning and city layout, greatly
The resettlement of amount contaminating enterprises, has left over a large amount of contaminated industrial sites, and contaminated soil problem situation is day by day tight
Weight, China's sudden pollution accident takes place frequently in addition, sudden water pollution event and petrochemical industry chemical plant blast thing
Part happens occasionally, and causes serious environmental hazard, explosive type or the common pollution of accident type contaminated site
Thing has alkane, benzene homologues, polycyclic aromatic hydrocarbon and other semi-volatile organic matters.The environmental pollution thus causing
Accident and the harm to human health have not only become the bottleneck of the restriction sustainable development of socio-economy, more
Become the key factor affecting residents ' health.
The soil restoring technology of current domestic and international application includes that burning, thermal desorption, Soil leaching, dystopy are solid
Fixedization/stabilization technology and biodegradable etc..Incineration technology can preferably in the soil of place to go pollutant.
It but cost energy consumption is high, is easily generated secondary pollution, and burn and directly destroy the character of soil itself and make it lose
Lose original function.THE METHOD OF THERMAL DESORPTION is repairing of a kind of industrial sites volatility/half volatile organic contamination
Compound method.Compare the limitation of incineration technology, use thermal desorption technology, by mode of heating separation soil
The mode of middle pollutant has obtained people and has paid attention to.
In U.S.'s super fund site remediation case, thermal desorption technology is short owing to processing the cycle, and effect is good,
It is applicable to contaminated soil.It is abroad widely used to engineering practice at present.1982-2004 there are about 70
U.S.'s super fund project uses this technology.Owing to nearly all organic pollution can be solved, can process and wave
Send out and half volatile organic contaminant (such as petroleum hydrocarbon, agricultural chemicals, Polychlorinated biphenyls) and mercury and arsenic etc..
Patent (200910030305.6) discloses thermal desorption device and uses heat to propose converter;Utilize fuel (coal,
Liquefied gas or natural gas) burning produce heat smoke heating cold air, make cold air heat up, so with dirt
Dye soil contact.In this patent, hot air temperature is generally below 350 DEG C, again due to air specific heat capacity relatively
Little, the temperature after soil heating will not be too high, thus be only capable of processing the relatively low benzene of contaminated soil mid-boiling point and
Benzene homologues, it is impossible to meet municipal pollution place organic pollution complexity and multifarious demand.Some sets
Standby exist the relatively low problem of heating-up temperature, differs bigger pollutant for processing molten boiling point in soil
Scarce capacity, and exhaust combustion equipment is likely to result in secondary pollution.
Patent (201010555400.0) described employing electrical heating method, described electrical heating elements is located at institute
Stating cylinder body outer wall, described electrical heating elements is cast aluminium heating collar.Although can be higher with temperature after heating temperature,
But electrical heating elements is cast aluminium heating collar, needing through barrel heat transfer, itself is located at cylinder body outer wall simultaneously
Cause outside radiation loss big, need substantial amounts of insulation material, cause power consumption cost high.
Existing thermal desorption recovery technique has very big application potential in China, and its subject matter is that energy consumption is high,
Vent gas treatment amount is big, and course of reaction is not easily controlled.Thermal desorption technology needs thermal source, and coal-fired air is dirty
Dye weight, and electrically heated power consumption cost is too high, current multiplex natural gas and diesel oil, mode of heating has directly
Heating (Fire Radiation or combustion gas convection current) and mediate contact heating (by physical isolation, such as steel plate, are incited somebody to action
Thermal source separates with heated pollutant).It is big to there is device volume in current thermal desorption technology, and installing/dismounting becomes
This height, long construction period, actual process generally also exists processing cost too high, cause polluting
The huge financing gap of soil treatment.There is appliance arrangement in thermal desorption in current remediation contaminated soil at home
Complicated, should not dismantle, problem, the Shortcomings on cost and application convenience such as energy resource consumption is many.
To sum up shown, in the face of China's land resource scarcity, repair the actual feelings that the duration is tight, Polluted Soil amount is big
Condition, the recovery technique that innovation is suitable for China's national situation is very necessary.Thermal desorption is it is crucial that the mode of heating of soil
And diabatic process, this reparation energy consumption cost relating to contaminated soil remediation technology and application pollutant scope,
Being badly in need of Development Technology at present advanced, lower-cost soil pollution Soil Thermal desorbs recovery technique, same to time limit
The particularity of the contaminated site in Urbanization in China, needs tail gas generation amount little, and small volume is just
It is to be also the problem that solution is presently required in transport and the mobile hot desorption processing means operating.
Content of the invention
The present invention proposes a kind of heat transfer efficiency height, and tail gas generation amount is few, utilizes 9 Cr 2 steel using electromagnetic heating desorption to repair and pollutes
The method and apparatus of soil, is characterized in that by electromagnetic eddy technology, contaminated soil being stirred by ferromagnetic material
Mix feeding device heat from inside and stir, make the pollutant being adsorbed in soil divide again after evaporating into gaseous state
From the device processing.
It is an object of the present invention to provide Electromagnetic Heating contaminated soil thermal desorption restorative procedure and device, thermal desorption fills
Put middle agitating device to be fully contacted with contaminated soil, utilize external electromagnetic coil to produce eddy current simultaneously and lead
Cause ferromagnetic stirring feeding device intensification heating soil, contaminated soil be heated to sufficient temp so that
Volatility/half volatile pollutant volatilizees from soil, is quickly siphoned away process by exhaust gas processing device real
Existing soil sanitation.Whole device does not needs preheating and supplementary air, decreases vent gas treatment amount and heat damages
Lose;Continuously stir the level of disruption of soil in enhancing system, improve the rate of volatilization of pollutant.
Compared with prior art, solenoid of the present invention itself does not heat, but by calutron from
The internal heat production of thermal desorption device, existing apparatus is all by air preheating system, is utilized air by air blast
Carry out hot mass transfer heating, and cause process tail large-minded, indirectly added by electrical heating elements at device outer wall
Hometown earth, heat transfer efficiency is low, and power consumption cost is high.
9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, its major part is pyrolyzed by soil pretreatment unit, electromagnetism
Inhale unit, tail gas treating unit composition.Soil pretreatment unit includes soil excavating gear (such as excavator
Deng), soil moisture system (such as dewaterer etc.), soil screening disintegrating apparatus (such as vibratory sieve, screening
Broken bucket, disintegrating machine, soil breaking bucket, rotary cultivator etc.), equipment needed thereby is according to the actual bar of contaminated soil
Part sets pretreatment unit composition.Contaminated soil must reject or grind for big rock and fragment before processing
Broken, less particle diameter can guarantee that pollutant by thermal release process be easier to, evenly.If material is very
Moist, it is necessary to process remove moisture to improve treatment effect with the method such as drying.
9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, its feature includes that 9 Cr 2 steel using electromagnetic heating desorption unit heat-producing unit is iron
Magnetic stirs feeding device, including spiral, oar blade type and scraper-type stirring feeding unit, for spirally
Or oar blade type, its cell body can be cylinder type or U-shaped two kinds of shapes, built with spiral or arm stirrer,
The spiral-shaped single axle helical that includes, double-shaft spiral, annular hollow spiral, blade form includes ellipse,
Rhombus, triangle, zigzag, waveform etc., size diameter size is 50-1000cm, and material is carbon steel,
Cast iron, the ferromagnetic material such as nickel cobalt (alloy) or heat-resistance stainless steel.Scraper-type trough can be square type and O type, interior
There are crawler type or chain-type scraper plate in portion, and scraper plate can be square, zigzag, waveform, and infundibulate is many
Hole shape, faller gill shape.Stirring feeding device is connected by shaft joint, is furnished with recirculated water cooling cooling at shaft joint
Unit protection motor, stirring feeding device rotating speed is adjustable, is driven by variable-frequency motor and is equipped with decelerator, subtracting
Speed device passes through hinge or gear is connected with shaft joint.
9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, in its feature includes device cell body, multiple spot lays TEMP
Device, described temperature signal is passed to control single chip computer, is controlled electromagnetism by electromagnetic controller and electrical power control cabinet
Induction.Switch board is in order to regulate and to control the parameters such as Electromagnetic Heating temperature, rotating speed.This switch board leads to
Crossing artificial intelligent temperature controller and thyristor module carrying out Power Regulation control, this artificial intelligence temperature controller has overtemperature
Warning function, to avoid calutron overtemperature destruction to process separating effect.Contaminated soil is filled by being provided with sealing
The feed hopper put adds, and spiral installed by feed hopper, by controller control for stirring and control charging.
Agitating device speed adjustable range 0.01-6r/min, cylinder slope 0.5~5 °, can adjust for different pollutants
Saving agitator speed and turning to and the time of staying in cell body for the device tilt adjustment material, raising processes effect
Rate.Stirring feeding device, i.e. as the heat source of contaminated soil, stirs again contaminated soil thermally equivalent,
Feeding device plays propelling and processes contaminated soil from charging aperture arrival discharging opening continuous processing effect simultaneously.
9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, its feature includes 9 Cr 2 steel using electromagnetic heating desorption unit heat-producing unit cell body
Outside laying heat-barrier material, including silicide fiber, glass fibre cotton plate/felt, asbestos, rock wool, vacuum
Cavity etc..Outer wall arranges thermal insulation layer, electromagnetic induction coil and heat-insulation layer, and external electromagnetic induction coil is simultaneously
Eddy heating for heating cell body and interior stirring device, it is preferable that described thermal insulation layer is refractory fibre or fire resistant heat preserving
Cotton, such as the materials such as slag wool, glass fiber, carbon fiber, heat-insulation layer is heat-resistant phenolic resins or adds fire retardant
Polyurethane etc., store heat dissipation capacity few.Device cell body inner top is provided with multiple thermal desorption gas collection hole composition, collection
Pore has the anti-clogging parts compositions such as wire netting, quick outflow thermal desorption system under the effect of air exhauster
Enter exhaust treatment system.
Thermal desorption device of the present invention is characterized in that exhaust treatment system includes exhaust collection pipeline, dedusting
Filter, condenser, it is catalyzed the device compositions such as oxidation-adsorption tower.Owing to not passing through gas heat-transfer, so not
Air is needed to compress and blower unit.Deduster include dry type (cyclone, bag filter formula dust arrester),
Wet type (literary composition formula washer) and fibre filter;The inside of described condenser is made up of multiple condenser pipes,
Dispersible high-temperature gas, improve condensation efficiency, outside by air compressor machine or circulating water, can be to difference
The organic pollution of evaporating temperature carries out classification condensation and concentrates, and organic gas can be cooled and compressed to liquid
Collection utilization, can reclaim fixed gas and a part of useful liquid phase organic matter;Described catalysis oxidation-adsorption
Tower, to fill composite oxide of metal load type active carbon as medium, can realize that electro-catalysis is worked in coordination with at chemical oxidation
Pollutant in reason waste gas.Device is provided with direct blast pipe simultaneously, in order to improve in the case of pollution-free
Exhaust efficiency.The place characteristic of different contaminated sites is different with pollutant characteristic, in place of its gaseous contaminant
Reason mode is also different, can select exhaust-gas treatment mode according to the character of organic matter, concentration and economy etc., make
Its qualified discharge.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, its feature also includes that 9 Cr 2 steel using electromagnetic heating desorption unit can
Using with plural serial stage, every level-1 area sets different thermal desorption temperature, and each region arranges and individually adds
Hot exhaust gas extraction device, the thermograde that can have set in zones of different continuously concurrently separates dissimilar
Pollutant.Component according to pending contaminated soil and content, Electromagnetic Heating makes it in different thermal desorptions
The thermograde of reaction interval and heating curve are accurately regulated, thus set corresponding for different soils
Optimal heat Desorption separation effect.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, is characterized by heavy metal combined contamination soil
Also may be repaired, in addition to thermal desorption separation is carried out to organic pollution, for Hg and metalloid As
Being separated by heating, Hg is heated to 350 DEG C, and As is heated to 450 DEG C;For Pb, Cd etc. passes through to add
Glass powder with low melting point, quartz sand and soda ash, mirabilite powder etc., according to 1: 1-2: 3 ratio mixing, heating rises
The formed glass state material of heavy metal after temperature to 510-600 DEG C, it is achieved fixing-stable.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, is characterized by that the time of staying of contaminated soil is
10-120min.Moisture content is limited in less than 25~30%, and moisture content, higher than 25% addition dehydrating agent, adds
Quick lime, natural drying, soil preheats, mechanical dehydration, different modes.Grain diameter exceedes certain model
Enclosing > 5mm, needing grinding and sieving pan feeding in advance, preprocessing means ensures the homogeneity of soil particle diameter.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, is characterized by actual mechanical process according to dirt
The species of dye soil organic matter and content binding tests result adjust residence time of material.Of the present invention
Technology can accurately and subregion set 9 Cr 2 steel using electromagnetic heating desorbent zone, process volatile organic matter can be with Low Temperature Thermal
Desorbing 100-320 DEG C, alkanes boiling point is typically relatively low, and kiln temperature can reach the purpose of separation at 200 DEG C,
It it is 121~178 DEG C as processed the operation temperature of gasoline;If there is semi-volatile organic matter it is necessary to high
Warm desorption, needs to be heated to 320-540 DEG C.Benzene homologues boiling point is high relative to alkane, maintains temperature in kiln
Spending 200~400 DEG C can realize separating, multiring aromatic hydrocarbon substance needs more than 400 DEG C and could divide with soil phase
From.Such as diesel oil, coal tar and several agricultural chemicals, the operation temperature processing diesel oil is 320~427 DEG C.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, in order to strengthen the mixing effect with contaminated soil,
Described agitating auger screw thread or scraper plate can increase projection, and its shape can select various ways, including strip
Shape, cylindric, coniform, ring-type, triangle taper, spherical, needle-like, dentation, flower-shaped, wavy,
Drops, the shape such as leaf shape.Collapse angle more than material in its inclination angle, contaminated soil material face, activity coefficient
More than 45%, being formed and being perpendicular to the axial stream that collapses, the lateral stirring so increasing contaminated soil is slided,
Improve output effect.
Contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus of the present invention, corrosion resistant wanted by its equipment and materials, high temperature resistant, property
Matter is stable, and groove (cylinder) body uses carbon steel or alloy or heat-resistance stainless steel material to use heat-resistance stainless steel material,
Metal material is outside uses devitrified glass or enamel technology to improve decay resistance, described flue, condenser,
Crude fibre filter, Metal Supported catalytic oxidation activity charcoal adsorbent equipment and vavuum pump are by heat-resisting stainless
Steel material is made.Described device volume is little, and efficiency is high, and tail gas generation amount is little, can be monolithically integrated in extension
The mobile platform such as car, semitrailer, becomes portable processing means.
The novelty of contaminated soil 9 Cr 2 steel using electromagnetic heating desorption method of the present invention and device is to be subtracted by Electromagnetic Heating
Lack heat transmission resistance so that the ferromagnetic stirring feeding device heating of driving contaminated soil material, directly with pollution
Soil contact heating.Thus reach the effect of accurate High Efficiency Thermal desorption.It has aobvious with existing thermal desorption technology
The advantage writing, mainly includes following four aspect:
1. heat transfer efficiency is high: be not necessarily to hot-air indirect heat transmission, the burning of existing employing oil or natural gas
Thermal desorption mode, after being required to heating air transmitted, direct or indirect contact stain soil realizes desorption again.
9 Cr 2 steel using electromagnetic heating desorption directly makes feeding screw eddy current heat production, quick heating and the thermal efficiency high, ferromagnetic not affecting
While the work of stainless steel spiral, it is achieved stir feeding and heating desorption function simultaneously.
2. security high pollution is low: the present invention uses Electromagnetic Heating mode to contaminated soil, and cleaning is reliable,
Become a thermal source relative to the thermal desorption equipment of conventional operation at the scene, as heavy oil or the sky of fuel
There is certain danger in the storage of right gas, relates to storing delivery safety risk.In 9 Cr 2 steel using electromagnetic heating desorption process
There is not naked light, heat radiation results from inside, is substantially reduced the risk of explosion of organic polluted soil thermal desorption.
Conventional pyrolysis is inhaled fuel combustion and is caused fume emission to increase atmospheric environment risk, its tail gas treatment device is huge,
Unit is complicated, energy consumption is high, the tail gas adsorption easily problems such as saturated, regeneration difficulty, and fossil fuel heating combustion
Burn product and also include carbon soot particles, the secondary pollution such as nitride and dissolved organic matter.Therefore 9 Cr 2 steel using electromagnetic heating
Desorption, without heating flue gas, has stopped the generation of secondary pollution in whole equipment flowsheet.
3. control is good: stirring its agitator speed of thermal desorption system of the present invention is adjustable, processes soil and exists
(heating) time that stops in thermal desorption device is controlled, and soil heating-up temperature is controlled, and degree of regulation compares fuel oil
Or the accuracy of temperature control that heated by natural gas is to contaminated soil exceeds an order of magnitude.Thus have in contaminated soil
Organic pollutants complexity well adapts to ability, not only can process the relatively low benzene of boiling point, toluene etc. organic
Thing, also has good treatment effect to the organic matter of higher;Temperature can set different intervals control simultaneously,
Being beneficial to continuous still separation variety classes pollutant, the present invention is to volatility/half volatile in contaminated soil
The disposable clean-up effect of organic pollution typically can reach 70-95%.
4. equipment is easy to mobile: owing to 9 Cr 2 steel using electromagnetic heating desorption is not required to by gas heat-transfer, so not needing air
Compression and blower unit, therefore discharge exhaust gas volumn little;Use internal 9 Cr 2 steel using electromagnetic heating desorption design, without flue gas
Heating, air velocity is slow, and dust is carried secretly few, and nitrogen oxides and oxysulfide under reducing atmosphere
Generate and also receive certain suppression;Its tail gas treating unit is less, it is simple to integrated design is to mobile device
On, become portable treating stations, increase flexibility.
The beneficial effects of the present invention is the volatile contaminant material can fast and effeciently removed in soil, and
The pollutant volatilizing is adsorbed by exhaust gas processing device, it is to avoid atmosphere pollution.The system architecture letter of the present invention
Single, simple to operate, safety, low cost, removable, applied widely;With similar products at home and abroad ratio,
Equipment flowsheet is simply effective, takes up an area little, and investment cost is low.
Brief description
Fig. 1 shows the principle schematic of the contaminated soil 9 Cr 2 steel using electromagnetic heating desorption apparatus according to the present invention;
Fig. 2 shows the 9 Cr 2 steel using electromagnetic heating desorption apparatus structural representation of a kind of scraper plate conveying according to the present invention;
Fig. 3 shows the 9 Cr 2 steel using electromagnetic heating desorption apparatus structural representation of a kind of spiral conveying according to the present invention;
Marginal data: 1-chain drive rotating shaft, 2-chain scraper, 3-thermal desorption device cell body, 4-electricity
Magnetic induction coil, 5-feed hopper, 6-discharging opening, 7-electromagnetic controller, 8-exhaust collection pipe, 9
-ventilation and dust removal filter, 10-condensation separator, 11-is catalyzed oxidation-adsorption tower, and 12-main shaft stirs
Spiral, 13-feeding agitating auger, 14-circulating water cooling device, 15-decelerator connection shaft, 16-drives
Dynamic motor, 17-contaminated soil, 18-heat-barrier material, 19-insulation material
Detailed description of the invention
For being fully understood by goal of the invention, feature and effect of the present invention, by following specific embodiment,
The present invention is elaborated, but the present invention is not restricted to this.
The principle schematic of the present invention is as it is shown in figure 1, contaminated soil 17 is in ferromagnetic agitating device, interior
There is heat-resistance stainless steel agitating device in portion, and heat-barrier material can be wrapped up in outside first, including asbestos, slag wool,
Glass fiber, the heat-barrier material 18 such as carbon fiber, outer layer is electromagnetic induction coil, and coil turn is at 1-50 root
Every cm width, determines with specific reference to actual current size, coil outer wrapping insulation material 19, for insulation
Material is cotton and heat-resistant phenolic resins or the polyurethane adding fire retardant, after applying AC power, electricity
Magnetic coil makes ferromagnetic agitating device and iron magnetic shell intensification heating contaminated soil.
Specific embodiment one
The structural representation of one embodiment of the present invention is as in figure 2 it is shown, be device top view.Electromagnetism is pyrolyzed
Inhaling device is racetrack hinge scraper-type device, interior installing scraper mixing device, and scraping interplate spacing is 5cm,
Scraper blade is fixed on hinge, and scraper plate is driven lower reciprocating rotation by hinge by the driving wheel at two ends,
Driving wheel is connected with variable-frequency motor and decelerator, and wherein variable-frequency electric motor driving power is 3kW, and rotating speed is adjustable,
Speed adjustable range is 0.01~2 rev/min;Racetrack thermal desorption device cell body cross section is rectangle, and width is
200mm so that contaminated soil transports in racetrack cell body, driving wheel diameter 500mm, in two-wheeled in the heart
Away from for 3000mm, made by stainless steel material, built-in stainless steel hinge and porous type scraper plate, cell body external application
If aluminium silicate wool insulation material, and it is wound around electromagnetic induction coil, and controlled by electromagnetic controller, rectangle
Cell body outer wall is provided with 2 set electromagnetic heating systems, often overlaps power 15kW, altogether 30kW;Arrange outside electromagnetic heating coil
Heat-insulation layer.Have multiple exhaust collection pipeline and temperature sensor in cell body, adding of different section can be controlled
Hot temperature, temperature sensor is all connected with electromagnetic controller with drive shaft electrode, can automatically show and control
Thermal desorption temperature and contaminated soil reaction time.
Contaminated soil 17 enters chain scraper plate stirring feeding device 3 by being provided with the feed hopper 5 of sealing device,
Under electromagnetic induction coil 4 effect, the contaminated soil in cell body 3 is pushed ahead under the effect by chain scraper plate 2,
Simultaneously ferromagnetic chain scraper plate electromagnetic induction intensification Direct Contact Heating contaminated soil heat exchange.When in contaminated soil
Volatility/semi-volatile organic matter evaporates, via exhaust collection under the effect of air exhauster and vavuum pump
Pipe 8 quickly flows out scraper-type thermal desorption device 3 and enters exhaust treatment system;Soil after heating is at chain
Thermal desorption system is discharged via discharging opening under the effect of shape scraper mixing device.The scraper plate being heated returns to
Waste heat continues and soil exchange heat transfer, and the Electromagnetic Heating temperature of scraper plate stirring thermal desorption device is up to two sections points
It is not 350 DEG C and 550 DEG C, (added by regulation drive shaft speed control stop in thermal desorption system for the soil
Heat) time, when minimum speed 0.02 rev/min, during stop in thermal desorption system for the contaminated soil
Between reach as high as 100 minutes.
Exhaust treatment system is by ventilation and dust removal filter the 9th, condensation separator 10 and 11 groups of oxidation-adsorption tower of catalysis
Become, made by carbon steel material.The tail gas discharged by scraper plate 9 Cr 2 steel using electromagnetic heating desorption system 3 initially enters dedusting
Filter 9, dust removal filter be fibre filter its be followed by air inducing air exhauster, effect is mainly removes sky
Particle that gas and contaminated soil are volatized in tail gas because of high-temperature heating and moisture, to ensure that follow-up tail gas is inhaled
The Effec-tive Function of attached process.Air-flow enters condensation separator 10 after leaving dust removal filter 9.Condenser by
Multiple condenser pipes are constituted, and the outside of described condenser is by circulating water;Described catalytic oxidation activity charcoal is inhaled
Adsorption device forms with other exhaust gas cleaners and connects.
Complete equipment floor space is 10m × 5m, about needs 40m2, total installation of generating capacity is 35~40kW, soil temperature
Degree reaches as high as more than 550 DEG C;Treating capacity changes with heating-up temperature, to process benzene and gasoline contamination soil is
Example, is 20% at soil moisture content, is heated to 105 DEG C from room temperature 15 DEG C, and treating capacity is about 0.9 ton hour.
Specific embodiment two
The structural representation of another embodiment of the invention is as it is shown on figure 3, be device side view.9 Cr 2 steel using electromagnetic heating
Desorption apparatus is tubular spiral agitator, is inside equiped with the main shaft of agitating auger, and pitch is 8cm, diameter
For 200mm, helical blade is fixed on main shaft, and main shaft passes through circulating water cooling device 14 and driving wheel phase
Even, driving wheel is connected with variable-frequency motor 16 and decelerator connection shaft 15, and wherein variable-frequency motor 16 drives power
For 3kW, rotating speed is adjustable, and speed adjustable range is 0.1~20 rev/min;Spiral thermal desorption device cell body cross section is
Circle, a diameter of 220mm so that contaminated soil transports in tubular cell body, spiral pyrolysis suction tube cell body is long
5000mm, is made by stainless steel material, lays asbestos insulation material, and be wound around electromagnetic induction line outside cell body
Circle, and controlled by electromagnetic controller, the external wall of rectangular channel is provided with 1 set electromagnetic heating system, power 45kW;
Heat-insulation layer is set outside electromagnetic heating coil.Have multiple exhaust collection pipeline and temperature sensor in cell body, permissible
Controlling different heating-up temperatures, temperature sensor is all connected with electromagnetic controller with drive shaft electrode, can be certainly
Move display and control thermal desorption temperature and contaminated soil reaction time.
Contaminated soil enters auger conveying dress by being provided with the feed hopper 5 of forced feed agitating auger 13
Put 3 to be carried by main shaft agitating auger 12, electromagnetic induction coil 4 effect under, the contaminated soil in cell body 3 by
Pushing ahead under the effect of main shaft agitating auger 12, simultaneously ferromagnetic agitating auger electromagnetic induction heats up and directly connects
Touch heating contaminated soil heat exchange.When in contaminated soil, volatility/semi-volatile organic matter evaporates, taking out
Quickly flow out auger thermal desorption device 3 under the effect of blower fan to enter at tail gas via exhaust collection pipe 8
Reason system;Soil after heating discharges heat via discharging opening under the effect of chain scraper mixing device
Desorption system.The Electromagnetic Heating temperature of auger thermal desorption device is up to 650 DEG C, by regulation drive shaft
Rotating speed controls stop (heating) time in thermal desorption system for the soil, when with rotating speed 1 rev/min,
The time of staying in thermal desorption system for the contaminated soil was up to 60 minutes.
Exhaust treatment system is by ventilation and dust removal filter the 9th, condensation separator 10 and 11 groups of oxidation-adsorption tower of catalysis
Become, made by carbon steel material.The tail gas discharged by scraper plate 9 Cr 2 steel using electromagnetic heating desorption system 3 initially enters dedusting
Filter 9, dust removal filter be fibre filter its be followed by air exhauster, air-flow leaves dust removal filter 9
Rear entrance condensation separator 10.Condenser is made up of multiple condenser pipes, and the outside of described condenser is by circulating
Water cooling;Described catalytic oxidation activity charcoal adsorbent equipment forms with other exhaust gas cleaners and connects, simultaneously
It is provided with direct blast pipe, in order in the case of contamination-free, improve exhaust efficiency.
Complete equipment floor space is 9m × 5m, about needs 45m2, total installation of generating capacity is 40~45kW, soil temperature
Degree reaches as high as more than 650 DEG C;Soil is polluted by semi-volatile organic matter, Polychlorinated biphenyls and arsenic.At soil
Before being placed into desorption apparatus and being heated to 480 DEG C, the particle more than 5cm for the diameter is all removed.For portion
Divide a small amount of soil must be again introduced into desorption apparatus, organic to ensure Polychlorinated biphenyls therein, half volatile
Thing and arsenic reach repairing standard.Costly for fuel heating with oil or natural gas, every cubic metre of process
Cost is about 1000-1500 unit.The handling of every cubic metre of contaminated soil of Electromagnetic Heating of the present invention
With cost about 250-500 unit
It is to be understood that, although foregoing invention content and detailed description of the invention are implemented already in connection with specific
Example describes the present invention, but is not limited to particular form described herein.But, the present invention's
Scope is only limited by appended claims.In the claims, term " including " does not excludes the presence of
Other parts or step.Although additionally, each feature can include in different claims, but
These features can be advantageously combined, and the content comprising in different claims does not means that feature
Combination be infeasible and/or disadvantageous.Additionally, single implication is not excluded for multiple.Additionally, right is wanted
Reference in asking is not necessarily to be construed as the restriction to scope.
The above is only the detailed description of the invention of the present invention, it is noted that general for this area
For logical technical staff, without departing from the spirit of the invention, may be made that some improvement, modification,
And deformation, these improve, change and deform and are regarded as in the protection domain of the application.
Claims (10)
1. Electromagnetic Heating contaminated soil thermal desorption restorative procedure and a device, is characterized in that being made by electromagnetism
With make contaminated soil ferromagnetic stirring feeding device produce inductive loop, ferromagnetic agitating device with contaminated
While soil is fully contacted so that it is eddy current heat production directly heats contaminated soil inside device;Electricity simultaneously
Magnetic heating and temperature control precision is high, can district grid, it is achieved being continuously separated of variety classes organic pollution.
2. contaminated soil thermal desorption device according to claim 1, its feature includes by soil pretreatment
Unit, 9 Cr 2 steel using electromagnetic heating desorption unit, tail gas treating unit composition;Described pay-off includes that spiral fetches earth,
Crushing and screening and forced-feeding device composition;Electromagnetic heater includes excitation controller, heats coil,
Insulation material, heating conveyor, temp probe, the part composition such as circulating cooling, thermal desorption temperature and
Heating curve can accurately be regulated, and stirring feeding device is connected by shaft joint, is furnished with recirculated water at shaft joint
Cold heat sink, is driven and is equipped with decelerator by variable-frequency motor, and decelerator passes through hinge or gear and company
Axial organ connects;Being provided with multiple thermal desorption steam vent at cell body inner top, in cell body, multiple spot lays TEMP
Device, described cylinder and temperature signal is passed to control single chip computer, by electromagnetic controller and electrical power control cabinet
Control electromagnetic intensity;Tail gas treating unit includes exhaust collection pipe, deduster, condenser collector,
The part composition such as catalytic oxidizing equipment.
3. the contaminated soil thermal desorption device according to claim 1-2, its described feature also includes stirring
Feeding device, including spiral, oar blade type and scraper-type stirring feeding unit, for spiral or blade
Formula, its cell body can be cylinder type or U-shaped two kinds of shapes, built with spiral or arm stirrer, spiral
Shape includes single axle helical, double-shaft spiral, annular hollow spiral, and blade form includes ellipse, rhombus,
Triangle, zigzag, waveform etc., a diameter of 50-1000cm, can be square type for scraper-type trough
With O type, there are crawler type or chain-type scraper plate in inside, and scraper plate can be sheet, bucket-shaped, arcuation and ring-type,
Its edge can be zigzag, waveform, infundibulate, porous, faller gill shape.
4. the contaminated soil thermal desorption device according to claim 1-2, is characterized as cell body described in it and stirs
Mix device corrosion-resistant, high temperature resistant, be carbon steel, cast iron, the ferromagnetic material such as nickel cobalt (alloy) or heat-resistance stainless steel,
Ferromagnetic materials surface uses devitrified glass or enamel technology to improve decay resistance;Its outside silicide fiber,
Glass fibre cotton plate/felt, asbestos, rock wool, vacuum cavities etc. are heat insulation;Thermal insulation layer, electromagnetism sense are set on it
Answer coil and heat-insulation layer, external electromagnetic induction coil eddy heating for heating cell body and interior stirring device, institute simultaneously
Stating thermal insulation layer is refractory fibre or fire resistant heat preserving cotton, such as the materials such as slag wool, glass fiber, carbon fiber, insulation
Layer is heat-resistant phenolic resins or the polyurethane etc. adding fire retardant, stores heat dissipation capacity few.
5. the contaminated soil thermal desorption device according to claim 1-2, its exhaust treatment system includes tail
Gas collecting, dust removal filter, condenser, it is catalyzed the devices such as oxidation-adsorption tower and forms: exhaust collection
Pipeline is made up of multiple collection holes, collects hole and has the anti-clogging parts compositions such as wire netting;Deduster includes
Dry type (cyclone, bag filter formula dust arrester), wet type (literary composition formula washer) and fibre filter;
The inside of described condenser is made up of multiple condenser pipes, dispersibles high-temperature gas, improves condensation efficiency, outward
Portion, by air compressor machine or circulating water, can carry out classification condensation to the organic pollution of different evaporating temperatures
Concentrating, organic gas can be cooled and compressed and utilize to liquid collection, can reclaim fixed gas and a part
Useful liquid phase organic matter;Described catalysis oxidation-adsorption tower is to fill composite oxide of metal load type active carbon
For medium, can realize that the pollutant in chemical oxidation treatment waste gas is worked in coordination with in electro-catalysis.
6. the contaminated soil thermal desorption device according to claim 1-2, its described feature also includes electromagnetism
Thermal desorption unit can use with plural serial stage, and every level-1 area sets different thermal desorption temperature, each district
Territory arranges individually heating tail gas extraction device, can be continuously while the thermograde that zones of different has set
Separate different types of pollutant;Component according to pending contaminated soil and content, skill of the present invention
Art can accurately and subregion sets thermograde and the heating curve of different 9 Cr 2 steel using electromagnetic heating desorption reaction interval.
7. the contaminated soil thermal desorption device according to claim 1-2, its described feature also includes device
Heavy metal is polluted composite soil and also can be repaired, in addition to organic matter pyrolysis is inhaled and separated, for Hg and class
Metal As is separated by heating, and Hg is heated to 350 DEG C, and As is heated to 450 DEG C;For Pb, Cd etc. passes through
Add glass powder with low melting point, quartz sand and soda ash, mirabilite powder etc., according to 1: 1-2: 3 ratio mixing, heating
The formed glass state material of heavy metal after being warmed up to 510-600 DEG C, it is achieved fixing-stable.
8. the contaminated soil thermal desorption device according to claim 1-2, its described feature also includes reality
In operating process, the species according to contaminated soil organic matter and content binding tests result adjust material stop
Time, the time of staying of contaminated soil is 10-120min, by regulating agitator speed and turning to;Stirring
Device rotary speed scope 0.01-6r/min, cylinder slope 0.5~5 °;By changing rotating speed and the inclination angle of cylinder
The regulation time of staying in cylinder for the material, thus ensure thermal desorption for soil type, pollutant
Species and concentration set corresponding optimal heat Desorption separation effect, improve treatment effeciency.
9. the contaminated soil thermal desorption device according to claim 1-2, its described feature also includes for increasing
Strong mixing effect, agitating auger screw thread or scraper plate can increase projection, and its shape includes strip, cylindric,
Coniform, ring-type, triangle taper, spherical, needle-like, dentation, pulpous state, wavy, the shape such as drops
Shape;Its contaminated soil material filling coefficient is more than 45%, collapses angle more than material in inclination angle, material face, is formed and hangs down
Directly in the axial stream that collapses, the lateral stirring so increasing contaminated soil is slided, and improves output effect.
10. the contaminated soil thermal desorption device according to claim 1-2, its feature also includes described dress
Putting volume little, efficiency is high, and tail gas generation amount is little, can be monolithically integrated in trailer, semitrailer etc. mobile flat
Platform, becomes portable processing means.
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CN112108513A (en) * | 2020-09-07 | 2020-12-22 | 生态环境部南京环境科学研究所 | Thermal desorption device and method for treating contaminated soil |
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CN107777988A (en) * | 2017-12-06 | 2018-03-09 | 中国人民解放军空军工程大学 | A kind of airport concrete pavement crack fast repairing material and device |
CN107777988B (en) * | 2017-12-06 | 2023-01-24 | 中国人民解放军空军工程大学 | Material and device for rapidly repairing cracks of airport concrete pavement |
CN109943341A (en) * | 2017-12-20 | 2019-06-28 | 上海绅涪生物科技有限公司 | A kind of environmental protection soil and preparation method thereof |
CN111451262A (en) * | 2020-04-09 | 2020-07-28 | 孙宇红 | Soil remediation and treatment system and method |
CN111451262B (en) * | 2020-04-09 | 2021-10-22 | 励拓安答(上海)环境工程技术有限公司 | Soil remediation and treatment system and method |
CN111659723A (en) * | 2020-07-19 | 2020-09-15 | 上海康恒环境修复有限公司 | In-situ thermal desorption remediation system and method for organic contaminated soil |
CN112108513A (en) * | 2020-09-07 | 2020-12-22 | 生态环境部南京环境科学研究所 | Thermal desorption device and method for treating contaminated soil |
CN112108513B (en) * | 2020-09-07 | 2022-03-08 | 生态环境部南京环境科学研究所 | Thermal desorption device and method for treating contaminated soil |
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