CN105983570A - Electromagnetic thermal desorption remediation method and device used for remediating contaminated sites - Google Patents

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

The 9 Cr 2 steel using electromagnetic heating desorption restorative procedure repaired for contaminated site and device

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.