CN209287962U - Contaminated soil in-situ heat reparation combination exchanger and Soil Thermal repair system - Google Patents

Abstract

The utility model discloses a kind of contaminated soil in-situ heat reparation combination exchangers, including outer sleeve, inner sleeve, electric heater is wound in the outside wall surface region helix of inner sleeve, in addition one intermediate sleeve is set between inside and outside sleeve, resistance wire on electric heater is placed among intermediate sleeve and inner sleeve, electric heating wiring is set on electric heater, uses flanged joint between inside and outside sleeve.The utility model carries out indirect heating reparation in situ to contaminated soil by using high-temperature flue gas caused by gas internal-combustion engine and electric power, high-temperature flue gas and resistance heating are used in combination in heat exchanger, it can carry out that flue gas hot repair is multiple and resistance heat reparation simultaneously, formation is provided multiple forms of energy to complement each other mechanism, with double shield, the temperature of soil remediation is remarkably improved using the heat exchanger.

Description

Contaminated soil in-situ heat reparation combination exchanger and Soil Thermal repair system

Technical field

The utility model relates to the apparatus field of ambient heat reparation, especially a kind of heat exchanger of contaminated soil remediation.

Background technique

Soil pollutant, have source is wide, type is more, the old and new's pollutant and deposit, inorganic type and organic type are polluted and compound are deposited The characteristics of.Wherein, inorganic pollution is based on the heavy metals such as cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel, organic pollutant category It is various, including toluene etc. the volatile organic contaminants such as halogenated hydrocarbons such as benzene homologues, trichloro ethylene and polycyclic aromatic hydrocarbon, Polychlorinated biphenyls, Half volatile organic contaminants such as organo-chlorine pesticide etc..

From the perspective of contamination control, soil remediation processing technique thinking can be divided into following two categories: (1) removing, degrade Pollutant in soil reduces its absolute content, reduces environmental risk；(2) change the occurrence patterns of pollutant in the soil, drop Its low transportable property and bioavailability in the environment, controls its Transport And Transformation into animals and plants, water body, atmosphere.

The research of soil remediation processing have been relatively mature, portion of techniques has obtained extensive engineer application.Due to soil It is pollutant complicated composition in earth, distinct, different repair process technologies can be used for various types pollutant.

Peripheral doses technology includes soil displacement, the soil isolation, melten glass, electro reclamation for heavy metal pollution Deng, and for technologies such as thermal desorption, the soil vapor extractions (SVE) of hot volatile contaminant.At present in soil remediation engineering, Frequently with solidification and stabilization technology restoration of soil polluted by heavy metal, organic dirt is repaired using soil vapor extraction, heat treatment technics Contaminate soil.

Whether needed to excavate soil according to soil remediation, also soil restoring technology can be divided into based technique for in-situ remediation and dystopy Recovery technique.Generally, for high concentration contaminated soil can not generally be backfilled based on showering technology, after reparation after It is continuous to make soil use；For volatile organic matter contaminated site, the process for excavating displacement transport easily leads to pollutant to ring The secondary pollution in border, thus based technique for in-situ remediation is more commonly used.

A kind of in-situ remediation method using soil vapor extraction technology (also known as soil vapor extraction) using vacuum pump on ground Negative pressure is generated in lower soil, rush causes air flow through contaminated soil hole, carries volatility and half volatile pollutant from extraction well Discharge, and be disposed, to reduce the total amount of pollutant in soil.The technology can be combined with air injection technique, mainly For repairing the contaminated soil of non-saturated region (aeration zone), but it is higher for the tonicity requirements of soil itself, there is certain office It is sex-limited.

A kind of in-situ method is directly to be inserted into contaminated soil using electrode to carry out reparation electromotion repairing technique, and such method exists It being carried out in wet environment, needs to consider the polarity of the pollutant of soil, for heating temperature at 100 °C or so, reparation temperature is lower, but Repairing efficiency is longer.

A kind of contaminated site, using hot-fixing in situ, using being driven by electricity, using resistance heating to contaminated site into The temperature of row indirect heating, heating is higher, can reach 100 ~ 400 DEG C.The technology heat exchanger radiates sleeve using electric-heating-wire-heating, Using quartz between heating wire, prevents naked heating wire from directly contacting and cause short circuit.

A kind of contaminated site is repaired using burning hot fume using hot-fixing in situ, containing inside and outside sleeve, Inner sleeve opening, flue gas are introduced into interior (outer) sleeve, subsequently into outer (interior) outflow.Heating temperature can reach 100 ~ 500 DEG C.This Kind method design is simple, and it is fast to repair place speed.

Situ heat treatment technology is the preferred process mode for organic polluted soil.Heat treatment technics is to utilize pollutant Heating state under volatility the characteristics of enhancing, using direct or indirect heat exchange, improve the soil moisture (150~760 °C), Promote pollutant to parse from soil particle, soil combination water, enhance its migration, thus gas recovery and deep to carrying out Degree processing.The adoptable heat medium of situ heat treatment technology is more, and in addition to hot-air, heat steam, hot fume, electricity can also be used The mode of heating carries out.

Utility model content

The utility model patent proposes a kind of contaminated soil in-situ heat reparation combination exchanger and using the heat exchanger Soil Thermal repair system, can carry out that flue gas hot repair is multiple and resistance heat reparation simultaneously, and formation is provided multiple forms of energy to complement each other mechanism, with dual guarantor Barrier.

A kind of contaminated soil in-situ heat reparation combination exchanger, including outer sleeve, inner sleeve, in the outside wall surface of inner sleeve Region helix winds electric heater, an intermediate sleeve is in addition arranged between inside and outside sleeve, by the resistance wire on electric heater It is placed among intermediate sleeve and inner sleeve, electric heating wiring is set on electric heater, uses flanged joint between inside and outside sleeve.

It is filled between the intermediate sleeve and inner sleeve using magnesia.

A kind of contaminated soil in-situ heat reparation combination exchanger, including outer sleeve, inner sleeve, inner sleeve is interior to be arranged U type Electric heater, electric heater include resistance wire, and magnesia, inner sleeve top is sealed using sealing flange, and electric heating is arranged and connects Line uses flanged joint between inner sleeve and outer sleeve.

A kind of contaminated soil in-situ heat reparation combination exchanger, including outer sleeve, inner sleeve, inner sleeve is interior to be arranged U type Electric heater, electric heater include resistance wire, and the distance on resistance wire every 0.5 ~ 1m is isolated using insulating materials, inner sleeve Top is sealed using sealing flange, and electric heating wiring is arranged, and flanged joint is used between inner sleeve and outer sleeve.

A kind of contaminated soil in-situ heat reparation combination exchanger, including outer sleeve, inner sleeve, inner sleeve is interior to be arranged spiral Shape electric heater, there are also resistance wire, magnesia, outer sleeve surfaces to be provided with the hole slot of smoke discharging for electric heater inside, can incite somebody to action Pollutant near heating region ejects carry out post-processing with the flue gas after heat exchange together.Flue gas is from inner sleeve side inlet Into heat exchanger, from outer sleeve side exit outflow heat exchanger, inner sleeve top is sealed using sealing flange, and electric heating is arranged Wiring uses flanged joint between inner sleeve and outer sleeve.

A kind of contaminated soil in-situ heat repair system, including gas internal-combustion engine, gas internal-combustion engine driven generator are sent out Electricity, gas internal-combustion engine are provided with appurtenances, lube oil cooler and cylinder sleeve water cooler, pass through media heat exchanger and lubricating oil Cooler, cylinder sleeve water cooler exchange heat, and deposit in a reservoir for changing hot medium, and be sent into injector well by high-pressure pump In, combinations of the above heat exchanger is placed in the heated well accomplished fluently in advance, gas internal-combustion engine piston acting final vacuum, by row Smoke pipeline beats pollutant vacuum extraction well into the inner sleeve in combination exchanger in the soil, and vacuum extraction pump connection is true Empty extraction well pumps out the pollutant come from vacuum extraction and is transmitted to pollutant disposal system, pollutant gas by pollutant pipe network Body is carried out by thermal oxidizer to the further oxygenolysis of pollutant, and gaseous pollutant passes through in spraying condenser, further Cooling to reduce pollutant temperature, fluid after cooling enters in gas-liquid separator, the separated from contaminants of liquid is come out, then again It is passed through activated carbon adsorption device, the dirt of the liquid come out from spraying condenser, gas-liquid separator and activated carbon adsorption device Object is contaminated, filter is initially entered, subsequently into being handled in hydrotreater, the flue gas that is come out from smoke exhaust pipe and is inhaled from active carbon The gaseous pollutant come out in adsorption device converges in bag filter, reduces the dust in gas, and mixed gas is passed through flue gas Desulfuring and denitrifying apparatus reduces sulfide and itrated compound concentration in gas, finally passes through the gas of chimney emission compliance.

Testing well is beaten in the soil, and temperature sensor and pressure sensor are set in testing well.

The heated well, injector well, vacuum extraction well and testing well all use cement seal opening.

The extraction well is arranged in the middle position of two heated wells, and testing well is close to heated well neighbouring position, heated well The distance between be 3 ~ 8 m.

Pebble and gravel pack are used between the combination exchanger and heated well.

The utility model is carried out by using high-temperature flue gas caused by gas internal-combustion engine and electric power to contaminated soil in situ Indirect heating reparation, high-temperature flue gas and resistance heating are used in combination in heat exchanger, and it is multiple and electric can to carry out flue gas hot repair simultaneously Thermal resistance reparation forms mechanism of providing multiple forms of energy to complement each other, and has double shield, the temperature of soil remediation is remarkably improved using the heat exchanger.

Detailed description of the invention

Fig. 1 is the contaminated soil in-situ heat repair system schematic diagram of gas internal-combustion engine system.

Fig. 2 a, Fig. 2 b, Fig. 2 c, Fig. 2 d are first kind combination exchanger schematic diagrames.

Fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d, Fig. 3 e are the second class combination exchanger schematic diagrames.

Specific embodiment

Content is introduced with above-mentioned with reference to the accompanying drawing, further detailed retouch is done to the technical solution of the utility model It states.

It is as shown in Figure 1 the contaminated soil in-situ heat repair system schematic diagram of gas internal-combustion engine system.

Combustion gas distributed energy selects gas internal-combustion engine 10, and natural gas 01 and air 02 enter in the cylinder of gas internal-combustion engine Burning, driving 10 piston of gas internal-combustion engine acting, piston drive the generator 11 being connected with crankshaft-and-connecting-rod, generate electricity.Institute Electricity, according to the of different sizes of internal combustion engine, voltage class can be divided into 0.4 kV and 10 kV, supply by transformer 12 is adjustable To the power of resistance heater 32, resistance heating temperature is controlled.Electric power after transformation by power supply line 04 and is wired back Route 05 is connected respectively at the positive and negative anodes of 32 wiring of connector lug resistance heater.The acting final vacuum of 10 piston of gas internal-combustion engine, row Temperature degree is 500 °C, by smoke discharging pipe 03, into resistance heater injection port.Flue gas temperature can pass through sky at this time Gas 02 excess coefficient is adjusted, and can also be adjusted by increasing and decreasing the flow of natural gas 01.Lube oil cooler 13, jacket water Cooler 14 is the appurtenances of gas internal-combustion engine 10, and by media heat exchanger 15 and lube oil cooler 13, jacket water is cooling Device 14 exchanges heat, and for changing hot medium there are in container 16, which can be water, catalysts either air. It is sent into injector well 25 by high-pressure pump 17.Injection water is conducive to improve underground pollution soil permeability, and extracting in injector well Well forms access；It is passed through air or reflects that catalyst is conducive to accelerate the oxidation and parsing of soil pollutant.When medium is sky Container 16 can not be used when gas.

The contaminated soil 20 for needing to repair, water level 21.Before carrying out Soil Thermal reparation, vacuum extraction can be used in advance Pumping takes the Free water in contaminated soil, reduces water level line 21, can reduce the use of gas fuel, energy saving.For with The chemical bonding water of pollutant and soil particle hygroscopic moisture are carried out the boiling point for being heated above water using heater, realize the steaming of water Hair.It needs to be sealed using coating 22 carrying out hot rehabilitating soil area top.Coating 22 uses cement, also can be in water Increase the heat-barrier materials such as one layer of asbestos below mud and forms combined coating.There are four effects for coating: 1) can effectively hinder The contaminant gases infiltrated in Soil Thermal repair process reduce secondary pollution；2) it is able to carry out heat-insulated, prevents soil surface Temperature is excessively high；3) support platform can be provided for heating equipment；4) rainwater can be hindered to enter repaired contaminated soil region.

Heated well is beaten in advance using Sonic drill, then by combination exchanger outer sleeve 23 and inner sleeve 28, electric heater 32 It being inserted into heated well after assembling, diameter that Sonic drill is dug a well is greater than the diameter of heat exchanger outer sleeve, and there are certain surplus, It using pebble and gravel 27, is evenly spaced in around heater, fills the gap before heated well and the well beaten.Gosling Cobble and gravel 27 have stronger thermal conductivity.

Similarly dug a well in advance using Sonic drill, pollutant vacuum extraction well 24 be inserted, using pebble and Gravel 27 plugs the gap.Pebble and gravel 27 have stronger fluid permeability.Extraction well is in Polluted area aperture or opens Slot can make aperture, can by after heating contaminant gases or Liquid Penetrant into vacuum extraction well 24.It is mentioned here true Sky refers to the vacuum state of the underground pollution soil region due to caused by the constantly suction underground of vacuum extraction pump 40.Improve pollution The vacuum degree of soil, is conducive to parsing and the desorption of pollutant, while preventing heating process gas escape into air.Vacuum is taken out It mentions between well arrangement and flue gas well and resistance heating well, sometimes, since heated well nearby also can produce pollutant, very Empty extraction well can be in the closer position of heated well.

The medium of fluid media (medium) injection is water, air and the catalysts after exchanging heat with media heat exchanger 15, passes through height Press pump 17 squeezes into injector well 25.The structure of injector well 25 is similar with extraction well, and injector well 25 is typically located at close to heated well Region.The infiltration for being conducive to soil when injection water under thermal drivers is more advantageous to and forms access with extraction well；Injection air makes to have Oxidation reaction occurs under high temperature environment conducive to pollutant, injection can accelerate decomposition and the desorption of pollutant when reflecting catalyst Efficiency changes contaminant species structure.Injector well can not be in operating status always.

Testing well 26 is used for temperature and pressure test, by using temperature sensor and pressure sensor, monitoring and control The temperature and pressure vacuum degree in contaminated soil region 20, temperature and pressure signal are acquired by data and converting means is sent to prison Control platform is analyzed, and then the vacuum degree in the temperature and contaminated soil of adjusting flue gas, resistance heating.In contaminated soil The measurement of portion's temperature and pressure can also not use testing well, and test probe direct is patched into contaminated soil.Before carry out project, Contaminant measurement well can be used to determine its position, pollutant concentration and the scale of construction in the test that need to carry out soil pollutant content. It can detect that the concentration of the pollutant from fluid of vacuum extraction pump 40 in Soil Thermal repair process.

Flue gas well, resistance heating well, injector well, vacuum extraction well and testing well described above all use cement seal Opening.It prevents from its body from leaking from pipe well to drain to atmospheric environment and cause secondary pollution.

The contaminant gases or gas-liquid mixture come out from vacuum extraction pump 40, are transmitted to dirt by pollutant pipe network 09 Contaminate object processing system.Contaminant gases are carried out by thermal oxidizer 41 to the further oxygenolysis of pollutant.Gaseous pollutant warp It crosses in spraying condenser 42, further cooling to reduce pollutant temperature, fluid after cooling enters in gas-liquid separator 43, will The separated from contaminants of liquid comes out.Then it is passed through activated carbon adsorption device 44 again.From spraying condenser 42, gas-liquid separator 43 With the pollutant of the liquid come out in activated carbon adsorption device 44, filter 48 is initially entered, subsequently into hydrotreater 49 It is handled, treated, and liquid need to meet emission request.The flue gas that is come out from smoke exhaust pipe 08 and from activated carbon adsorption device 44 In the gaseous pollutant that comes out converge in bag filter 45, reduce the dust in gas, mixed gas is passed through flue gas desulfurization Denitrification apparatus 46 reduces sulfide and itrated compound concentration in gas, finally passes through the gas of 47 emission compliance of chimney.Separately Outside, a kind of above situation for listing pollutant process mode can be used for containing the not flammable pollutant of hydrocarbon-containifirst Heat exchanger and condenser directly condense, and then carry out subsequent processing, save high-temperature thermal oxidation step.

Extraction well is arranged in the middle position of heated well.Testing well is close to heated well neighbouring position.Between heated well away from From for 3 ~ 8 m, the distance the close more is conducive to quickly repair contaminated site.

The most important underground pollution soil heat exchange component of this technology is described below.

Fig. 2 show the combination exchanger schematic diagram of first kind flue gas heater, electric heater composition.

Such as Fig. 2 a, which contains outer sleeve 23, and inner sleeve 28 is twined in the outside wall surface region helix of inner sleeve 28 Around electric heater 32, combination exchanger is put into the well for the need heating accomplished fluently in advance, and gosling is used between combination exchanger and well Cobble and gravel 27 are filled, and as shown in 2b, intermediate cross-section can be seen that internal structure.High-temperature flue gas enters from inner sleeve 28, inner sleeve Cylinder lower openings, hot fume will be transmitted in contaminated soil from 37 outflow of outer sleeve outlet, heat from combination exchanger.It should The electric heater of technology is disposed with two ways, and a kind of mode as shown in Figure 2 c directly uses the electric heater of surface insulation Electric heating wiring 35 is arranged on electric heater 32, uses flange between inside and outside sleeve for the outside wall surface of 32 spiral winding inner sleeves 28 36 connections.In addition by the way of such as Fig. 2 d an intermediate sleeve 31 is arranged, by electric heating in another between inside and outside sleeve Resistance wire 30 on device 32 is placed among intermediate sleeve 31 and inner sleeve 28, is filled using magnesia 29.

The flue gas of first kind combination exchanger does not contact directly with soil pollution gas, can prolong the service life.

Fig. 3 show the combination exchanger schematic diagram of the second class flue gas heater, electric heater composition.

Such as Fig. 3 a, 3b, electric heater is put into flue gas inner sleeve 28 by such heater.Electricity in inner sleeve 28 Heater, there are three types of forms, the first is as shown in Figure 3c, and electric heater contains resistance wire using the resistance heat exchanger of insulation 30, magnesia 29 and 310S stainless steel protection shell, magnesia have good heating conduction.Second as shown in Figure 3d, directly makes With resistance wire 30, quartz insulator material 33 is used every the distance of 0.5 ~ 1m on resistance wire 30, prevents the intersection of resistance wire 30 from connecing Touching causes short circuit.The third is as shown in Figure 3 e, the third uses spiral electric heater 32, and there are also resistance for spiral heater inside Silk 30, magnesia 29 form.The elevation of the combination heater as shown in 3b, 23 surface circular of combination exchanger outer sleeve or Pollutant near heating region can be ejected carry out post-processing with the flue gas after heat exchange together by the hole slot 39 of rectangle. Flue gas enters heat exchanger from 28 side inlet 34 of inner sleeve, from 23 side exit of outer sleeve, 37 outflow heat exchanger, inner sleeve 28 Portion is sealed using sealing flange 38, and electric heating wiring 35 is arranged, and gap is welded using flange 36 between inner sleeve and outer sleeve Sealing.Heater is placed in combination exchanger inner sleeve 28 in second class combination exchanger, will not be due to the contact with pollutant Generate corrosion.

The flue gas bush material of the above two classes combination exchanger is recommended to use ND stainless steel or 310S stainless steel, material High temperature limit is higher, and acid corrosion-resistant ability is stronger, fully meets the high temperature and acid corrosion condition of flue gas.Inside and outside sleeve surface applies It is black, increase caloradiance.Electric heating wire is using the softening of the high temperature resistants such as Ni80 alloy, iron cadmium magnesium alloy and the alloy of forceful electric power thermal resistance Material；It is filled using magnesium oxide material, magnesium oxide material has electrical insulating property and good thermal conductivity.The combination exchanger adds Hot temperature can reach 500 ~ 800 DEG C, and temperature is higher, can accelerate contaminant removal process.

The utility model technology can be applied to the contaminated soil remediation of hydrocarbon compound and its derivative, be adapted to volatilize Property, half volatile and difficult volatile pollutant, while the heavy metal contaminants of some low boiling points can also be applied.

Gas internal-combustion engine power generation and flue gas system, pass through the burning of natural gas, driving internal combustion engine in the utility model patent Acting, can produce the electric power resource of 30 ~ 45 %, can produce 400 ~ 450 °C of the high-temperature flue gas of 40 ~ 45 %.In addition, in combustion gas Combustion engine needs cooling internal combustion engine cylinder jacket and lubricating oil, can generate 50 ~ 90 °C of hot water.Electric power resource can directly or indirectly be given Combination exchanger uses.High-temperature flue gas is passed through combination exchanger indirect heating contaminated soil.Generated jacket water can be by changing By air, catalyst, water or other fluid medium is passed through in injector well, accelerates soil pollutant removal process for hot device heat exchange.

The unitized exchanger of contaminated soil in the utility model patent, with the increase of heat, the temperature of contaminated soil Degree gradually rises, and the pollutant temperature in contaminated soil is made to be higher than its gasification temperature, under the action of vacuum pump extracting, pollutant By parsing from soil, the processes such as pyrolysis and oxidation are finally evaporated.

In some cases, soil pollutant and liquid water blend, and this technology still adapts to.Firstly, between soil The water of gap carries pollutant secretly, can extract in advance, reduce the water level line of underground.The pollutant carried secretly in water is pumped up It is post-processed.Secondly, the liquid water being in close contact with contaminated soil, after heat exchanger heating, heating temperature is much Higher than the gasification point of water, pollutant can be carried secretly under the action of vacuum suction, in water and is evaporated together.Again, high temperature ring Border can destroy the structure of matter of some pollutants, make pollutant is broken to parse, can equally remove the pollution in soil Object.Finally, as previously mentioned, in the utility model contaminated soil can be injected, injectable media can for heat exchange after air, Water or pollutant reaction catalyst are passed through air and water energy are enough and extraction well forms access；It is passed through air or catalysts It can be pyrolyzed or oxidation stain object, improve the removal efficiency of pollutant.It is dirty for high boiling low volatility in the utility model Object is contaminated, due to adjustable flue-gas temperature and resistance heating amount, maximum temperature can reach 500 °C or so, therefore this method is also the same It adapts to.

Heated well described in the utility model patent, injector well and extraction well, it is unlimited according to the difference of site remediation demand Placement that is vertical in progress, horizontal or having certain tilt angle.Extraction well extracts the pollutant in soil, makes contaminated soil shape At vacuum environment.Extraction well is the sleeve containing hole or stria, pollutant can be allowed to pass through.The heated well, injector well and Porous media, such as pebble and gravel are filled between the outer layer of extraction well and the well accomplished fluently in advance.

For the early period of project, some Contaminant measurement wells can be done with determine pollutant position, pollutant concentration and The scale of construction.During soil remediation, it can detect and export monitoring pollution object concentration in extraction well, while can pacify near heated well Temperature and pressure testing well is filled, temperature and pressure sensor, monitoring and control contaminated soil heating temperature and pumping are installed wherein Propose vacuum degree.

The utility model patent can do thin solum hot repair and answer, and it is multiple can also to do deep soil hot repair.Due to heating temperature compared with Height, the recoverable place of this patent most depth are -10 m.

There is a coating on the utility model patent soil remediation region surface layer, cement layer that coating material is 20 cm or Composite coating is formed with heat-barrier materials such as asbestos.Can be effectively heat-insulated, prevent the polluted gas of heating from penetrating into ambient atmosphere Middle formation secondary pollution, while rainwater can be prevented etc. and penetrate into underground.In addition to pollutant is prevented to be diffused into the soil on periphery, Deeper iron plate can be squeezed into vertically in pollutant soil periphery.

In the utility model patent polluted gas extracting collect and smoke processing system, using pipe network connection extraction well, Vacuum pump, flue gas and polluted gas processing system.Pollutant is extracted from vacuum pump by vacuum pump, into pollutant Gas handling system, oxygenolysis pollutant further first, makes high temperature pollution gas enter spray equipment, further decreases temperature Degree, then carries out gas-liquid separation, carries out to pollutant outside the liquid after gas-liquid separation and the liquid by heat exchange sprayed Qualified discharge after water process.The gas after spray equipment carries out activated carbon adsorption out, then carries out bag-type dust and desulphurization denitration, Reduce dust and acidic materials, last gas qualified discharge.After flue gas for heating can be directly over dedusting and desulphurization denitration Qualified discharge.Gas-liquid separation and spray condensed water need to carry out to discharge after water process is up to standard.

Claims (5)

1. a kind of contaminated soil in-situ heat reparation combination exchanger, which is characterized in that including outer sleeve (23), inner sleeve (28), electric heater (32) are wound in the outside wall surface region helix of inner sleeve (28), one is in addition arranged between inside and outside sleeve Resistance wire (30) on electric heater (32) is placed on intermediate sleeve (31) and inner sleeve (28) is intermediate, electricity by intermediate sleeve (31) Electric heating wiring (35) are set on heater (32), are connected between inside and outside sleeve using flange (36).

2. a kind of contaminated soil in-situ heat reparation combination exchanger according to claim 1, which is characterized in that in described Between be filled between sleeve (31) and inner sleeve (28) using magnesia (29).

3. a kind of contaminated soil in-situ heat reparation combination exchanger, which is characterized in that including outer sleeve (23), inner sleeve (28), U type electric heater (32) being set in inner sleeve (28), electric heater (32) includes resistance wire (30), magnesia (29), Inner sleeve (28) top is sealed using sealing flange (38), and electric heating wiring (35) are arranged, and is made between inner sleeve and outer sleeve It is connected with flange (36).

4. a kind of contaminated soil in-situ heat reparation combination exchanger, which is characterized in that including outer sleeve (23), inner sleeve (28), U type electric heater (32) are set in inner sleeve (28), electric heater (32) includes resistance wire (30), in resistance wire (30) On every 0.5 ~ 1m distance using insulating materials (33) be isolated, inner sleeve (28) top using sealing flange (38) sealing, and It is arranged electric heating wiring (35), is connected between inner sleeve and outer sleeve using flange (36).

5. a kind of contaminated soil in-situ heat reparation combination exchanger, which is characterized in that including outer sleeve (23), inner sleeve (28), helical form electric heater (32) are set in inner sleeve (28), electric heater (32) is internal, and there are also resistance wire (30), magnesia (29), outer sleeve (23) surface is provided with the hole slot (39) of smoke discharging, can be by the pollutant near heating region together with changing Flue gas after heat ejects carry out post-processing, and flue gas enters heat exchanger from inner sleeve side inlet (34), from outer sleeve (23) 37 outflow heat exchanger of side exit, inner sleeve (28) top is sealed using sealing flange (38), and electric heating wiring (35) are arranged, It is connected between inner sleeve and outer sleeve using flange (36).