CN106216381B - The freezing isolation of contaminated soil and thermal desorption integral system in situ and processing method - Google Patents
The freezing isolation of contaminated soil and thermal desorption integral system in situ and processing method Download PDFInfo
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- CN106216381B CN106216381B CN201610635465.3A CN201610635465A CN106216381B CN 106216381 B CN106216381 B CN 106216381B CN 201610635465 A CN201610635465 A CN 201610635465A CN 106216381 B CN106216381 B CN 106216381B
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- well
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- contaminated soil
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to the cooling isolation of contaminated soil and thermal desorption integral system in situ and contaminated soil processing method, including be uniformly equally spaced along restoring area edge multiple freezing wells, with the cooling system of cooling well connection, the heated well in restoring area, heating system, the extraction well in restoring area and the suction system being connected with suction system being connected to heated well；For adjacent freeze wells spacing less than 1 meter, heated well and freezing well spacing are greater than 2 meters；The cooling system includes refrigerating cycle pipe and frozen liquid injected system in merging freezing well, and the outlet of frozen liquid injected system freezes well, freezes the inner side and outer side setting manometer of well；The heating system includes the heating tube being set into heated well and hot steam injected system, the outlet heated well of hot steam injected system.Freezing isolation barrier technology and Soil Thermal desorption technique are combined, design obtains freezing isolation and the original position thermal desorption integral system of contaminated soil.
Description
Technical field
The invention belongs to groundwater remediation fields in environmental protection, and in particular to a kind of the freezing isolation and original of contaminated soil
Position thermal desorption integral system.
Background technique
In recent years, the quantity of moving outside along with industrial enterprise, the contaminated site in city gradually increases, to nearby residents
Potential environmental threat is formd, valuable land resource in city is occupied, affects the sustainable development in city.Pollution Field
There may be miscellaneous pollutant, including heavy metal contaminants and organic pollutant etc. in ground, some of the contaminants have tired
Product property is easy to generate threat to periphery crowd.Therefore, it is necessary to carry out improvement reparation to this kind of contaminated site.Common soil is controlled
Reason recovery technique has ten several, can be divided into physics, chemistry and bioanalysis three categories.
Pyrolysis adsorption technology is the physical processing techniques for handling organic material contaminated soil, is referred to through direct or indirect heat exchange
Pollution medium and its contained organic pollutant are heated to enough temperature, organic pollutant is transferred to from solid phase soil
Gas phase simultaneously evaporates it, and vapor phase contaminants are handled by way of burning or condensation adsorption again, discharges after up to standard.Thermal desorption
Organic pollutant of the recovery technique suitable for handling the volatility soil, half volatile is not suitable for handling heavy metal pollution
Object.
The migration and diffusion that quarantine measures limitation pollutant is often taken in the improvement repair process of contaminated site, are having
During the thermal desorption of machine pollutant, need to be arranged the migration of isolation barrier limitation pollutant, to realize the thorough pumping of pollutant
It mentions.Common isolation barrier specifically includes that mixing pile diaphragm wall, high-pressure rotary jet grouting pile, water-stop curtain, freezing isolation barrier.Wherein,
Freezing isolation barrier installation is easy to operate, short time limit, can play effective isolation effect, adaptable, water proof in a short time
Property good, environment influence it is small.Freezing isolation barrier is to be freezed soil layer, water-bearing stratum around freezing well by artificial cooling technology,
Frost wall is formed underground water is isolated.Freezing process can be divided into indirect freezing and two kinds of direct freezing.Indirect freezing is logical
Hypothermic saline circulation is crossed, the heat in the soil body is taken away, makes freezing soil.And direct freezing is to freeze liquid nitrogen or dry ice
Knot manages interior direct gasification, realizes refrigeration using gasification latent heat and temperature rise sensible heat, finally gas is discharged in air again.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, in conjunction with freezing isolation barrier technology and soil thermal desorption skill
Art, design obtain freezing isolation and the original position thermal desorption integral system of contaminated soil.By in a short time around Polluted area
Arrangement freezing well, forms the impermeable isolation barrier of one of single layer, controls contaminant transportation in soil or underground water, then utilizes original
Position pyrolysis desorption system extracts the pollutant in soil.
To achieve the above objectives, isolation and thermal desorption integral system in situ are cooled down the present invention provides contaminated soil,
Including the multiple freezing wells being uniformly equally spaced along restoring area edge, the cooling system being connected to cooling well, position
In in restoring area heated well, be connected to heated well heating system, the extraction well in restoring area and with suction be
The connected suction system of system；
For adjacent freeze wells spacing less than 1 meter, heated well and freezing well spacing are greater than 2 meters；Well is extracted at a distance from heated well
Less than 0.5 meter, extracts well and be greater than 1 meter at a distance from freezing well；
The cooling system includes refrigerating cycle pipe and frozen liquid injected system in merging freezing well, frozen liquid
The outlet of injected system freezes well, freezes the inner side and outer side setting manometer of well；
The heating system includes the heating tube being set into heated well and hot steam injected system, hot steam injected system
Outlet heated well；
Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system is exchanged to heating system.
Integral system includes orienting freezing well, cooling tube, frozen liquid to be injected and extracted from system, refrigeration compressor, heat
Steam manufacturing device, heated well, heating tube, extracts well and manometer, a refrigeration at heat exchanger, and a heating passes through
Heat exchanger carries out heat exchange.
Manometer is mounted on the inner side and outer side of freezing well by the present invention, monitors icing barrier by measurement head
Thickness and depth.It may be recovered after the completion of integral system use, freezing well be first shut off, when extending the operation of heated well
Between, while hot steam being injected in freezing well, after soil to be frozen thaws, takes out cooling tube, for other places freezing every
From.
Preferably, restoring area is arranged to circle, the freezing well by circumference in restoring area extension, heated well and
Extraction well is respectively positioned on inside circumference.
Preferably, the freezing well is arranged in soil by the way of being inclined outwardly.
Preferably, freezing liquid injection pipe and extraction pipe are arranged in the freezing well.
Preferably, the inclined angle alpha is greater than 10 °, and freezing shaft bottom end to contaminated area bottom end height is greater than 2m.
A kind of contaminated soil processing method, including,
Planning freezing well, heated well and the position step for extracting well: it is wherein evenly spaced apart around restoring area in soil
Arrangement freezing well, freezes the depth of well at least below 2 meters of Polluted area bottom, the spacing between adjacent freeze wells is less than in earth
1 meter, in the restoring area that freezing well surrounds, heated well and freezing well spacing are greater than 2 meters for heated well and extraction well location；Extraction well
With at a distance from heated well less than 0.5 meter, extraction well with freezing well at a distance from be greater than 1 meter；
Cooling tube: being put into freezing well by the step of manufacturing freeze barrier first, and liquid nitrogen or dry ice injection are freezed well,
Directly freezed is carried out, refrigeration compressor is then turned on, frozen liquid is injected to freezing bottom, extracts freezing out above freezing well
Fluid re-starts cooling, realizes the circulation of frozen liquid, while collecting heat using heat exchanger；
Thermal desorption step: after freeze barrier is formed, heating tube being put into heated well, is passed through hot steam, utilizes extraction well
Extract pollutant.
Further include preferably recycling step: after using, hot-air being injected in refrigerating cycle pipe, soil to be frozen
After defrosting, cooling tube is taken out.
Preferably, the frozen liquid is calcium chloride brine, sodium chloride brine, ethyl alcohol or ethylene glycol.
Preferably, in the position step of planning freezing well, heated well and extraction well, freezing well, heated well and extraction well are adopted
It is punched with tube method is rammed, wherein freezing well outward install by inclined direction.
Well is freezed along the arrangement that is uniformly equally spaced around restoring area, is arranged in uncontaminated soil or substantially untainted
In soil, with the installation of inclined direction.Refrigerating process is by the way of indirect refrigeration, using frozen liquid as circulation of fluid band
The heat in soil is walked, plays the role of freezing soil, used frozen liquid is calcium chloride brine, sodium chloride brine, second
Alcohol or ethylene glycol etc..
Manometer is mounted on the inner side and outer side of freezing well by the present invention, monitors icing barrier by measurement head
Thickness and depth.It may be recovered after the completion of integral system use, freezing well be first shut off, when extending the operation of heated well
Between, while hot steam being injected in freezing well, after soil to be frozen thoroughly thaws, cooling tube is taken out, for the cold of other places
Freeze isolation.
The present invention designs to obtain the freezing isolation of contaminated soil and thermal desorption integral system in situ, refrigeration compressor generate
Heat pyrolysis desorption system is transmitted to by heat exchanger.In restoring area, live thermal desorption soil repair system can be increased
The soil moisture, pollutant vaporizes in soil, to promote the extracting of pollutant.Using freezing well around a restoring area
Formed freeze isolation barrier, prevent pollutant restoring area migration and flowing (flowing in or out), prevent pollutant from
Restoring area flows into uncontaminated soil, prevents contamination.Inhibit underground water to flow into restoring area and can reduce to need to handle
The amount of underground water, therefore can reduce the size for the treatment of facility, it reduces in groundwater remediation cost.Similarly, contaminant restraining stream
The dynamic operating cost that can reduce live thermal desorption repair system.
The present invention will freeze well and thermal desorption design in same set of system, and a refrigeration, one heats, and passes through heat exchanger
Heat exchange is carried out, ability needed for saving heating, and then save rehabilitation expense.Freezing well with heated well should have it is certain away from
From, so as not to freezing soil be rapidly heated, influence freeze isolation effect.Heated well should be close to extraction well, convenient for pyrolysis gas
Extracting.Strict control freezes the distance between well and heated well, prevents the generation of interference problem, causes energy dissipation.
The present invention freezes in such a way that directly freezed and indirect refrigeration combine, and water-resisting property is good, environment influence is small, cold
Jelly effect is good, and the freezing isolation barrier of formation is uniform, and closure is good；In addition, being prepared needed for freezing isolation barrier using freezing
Duration it is shorter, can satisfy the requirement quickly repaired.Freeze isolation barrier and scene thermal desorption soil repair system two in situ
Person can share a set of drilling device, and required refrigerating and heating combined equipment can put together, reduce space occupied area.Refrigeration
The heat that compressor generates is transmitted to pyrolysis desorption system by heat exchanger, reduces the consumption of energy, and then reduces thermal desorption and repair
The operating cost of multiple process.
Detailed description of the invention
Fig. 1 is that well, heated well and extraction well schematic layout pattern are freezed in the present invention；
Fig. 2 is to freeze well inclined schematic diagram in the present invention；
Fig. 3 is the schematic diagram for freezing frozen liquid inlet and outlet port in well；
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
It is repaired according to the cooling isolation of Fig. 1 to contaminated soil shown in Fig. 3 with thermal desorption integral system in situ, including edge
Regional edge is along the multiple freezing wells being uniformly equally spaced, the cooling system being connected to cooling well, the heating in restoring area
Well, heating system, the extraction well in restoring area and the suction system being connected with suction system being connected to heated well；Phase
Well spacing L is less than 1 meter for neighbour's freezing, and heated well and freezing well spacing are greater than 2 meters；Extract well at a distance from heated well less than 0.5 meter,
It extracts well and is greater than 1 meter at a distance from freezing well；The cooling system includes refrigerating cycle pipe and freezing in merging freezing well
The outlet of infusion fluid systems, frozen liquid injected system freezes well, freezes the inner side and outer side setting Fluid pressure of well
Meter；The heating system includes the heating tube being set into heated well and hot steam injected system, and hot steam injected system goes out
Mouth connection heated well；Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system is exchanged to heating system.
Integral system includes orienting freezing well, cooling tube, frozen liquid to be injected and extracted from system, refrigeration compressor, hot steam manufacture
Device, heated well, heating tube, extracts well and manometer, a refrigeration at heat exchanger, and a heating passes through heat exchanger
Carry out heat exchange.
Manometer is mounted on the inner side and outer side of freezing well by the present invention, monitors icing barrier by measurement head
Thickness and depth.It may be recovered after the completion of integral system use, freezing well be first shut off, when extending the operation of heated well
Between, while hot steam being injected in freezing well, after soil to be frozen thaws, takes out cooling tube, for other places freezing every
From.
Restoring area is arranged to circle, and the freezing well is by circumference in restoring area extension, heated well and extraction well
It is respectively positioned on inside circumference.Preferably, the freezing well is arranged in soil by the way of being inclined outwardly, and angle is 10 ° of α >,
Height h > 2 meters of the freezing shaft bottom end to contaminated soil bottom.
The operating procedure of integral system are as follows: (1) planning freezing well, heated well and the position of extracting well, and be oriented
Drill-well operation；(2) refrigerating cycle pipe is put into well, opens refrigeration compressor, frozen liquid is then injected in well, carried out cold
Freeze operation；(3) after freeze barrier is formed, heating tube is put into heated well, is passed through hot steam, extracts pollution using well is extracted
Object.In embodiments, refrigeration system should be first run, the heating of operation pyrolysis desorption system and suction system after barrier to be isolated is formed
System.
Well is freezed along the arrangement that is uniformly equally spaced around restoring area, is arranged in uncontaminated soil or substantially untainted
In soil, with the installation of inclined direction.Refrigerating process is in such a way that directly freezed and indirect refrigeration combine, first with dry
Ice or liquid nitrogen carry out directly freezed processing, then take away the heat in soil using frozen liquid as circulation of fluid, play cold
The effect of frozen soil earth, used frozen liquid are calcium chloride brine, sodium chloride brine, ethyl alcohol or ethylene glycol etc..
One, preparation of construction
1) construction site arranges, and is equipped with water, electricity；
2) planning freezing well, heated well and the position for extracting well.
Two, directional drilling
1) using tube method punching is rammed, the aperture for freezing well is 10cm, and heated well and the aperture for extracting well are 5cm, freeze well
Inclined direction installation outward, 10 degree of offset from perpendicular；
2) for freezing well according to circumference, circular diameter is 20 meters, and the spacing of adjacent freeze wells is 1 meter, freezes the depth of well
Lower than 2 meters of Polluted area bottom；
3) heated well is located inside circumference, and heated well and the shortest distance for freezing well are 2 meters.
Three, refrigerating cycle pipe is installed
1) frozen liquid is injected and extracted from pipe to be put into freezing well, then liquid nitrogen is added in freezing well, opens refrigeration
Compressor injects frozen liquid in freezing well, while the frozen liquid on constantly extraction upper layer；
2) frozen liquid circulate operation is constantly carried out.
Four, freezing isolation barrier monitoring
1) manometer is mounted on to the inner side and outer side for the well that freezes；
2) thickness and depth of icing barrier are monitored by measurement head.
Five, pollutant extracts
1) after freeze barrier is formed, heating tube is put into heated well；
2) heating system is opened, hot-air is passed through into heated well, extracts pollutant by extracting well.
Six, the recycling of integral system
1) cooling fluid in refrigerating cycle pipe is extracted out first；
2) hot-air is injected in refrigerating cycle pipe, after soil to be frozen thaws, takes out cooling tube.
The preferred embodiment of the present invention has been described in detail above, but the invention be not limited to it is described
Embodiment, those skilled in the art can also make various equivalent on the premise of not violating the inventive spirit of the present invention
Variation or replacement, these equivalent modifications or replacement be all included in the scope defined by the claims of the present application.
Claims (6)
1. the cooling isolation of contaminated soil and thermal desorption integral system in situ, which is characterized in that
Including the multiple freezing wells being uniformly equally spaced along restoring area edge, the cooling system being connected to cooling well, positioned at repairing
Heated well in multiple region, the heating system being connected to heated well, the extraction well in restoring area and with suction system phase
Suction system even；
The freezing well is arranged in soil by the way of being inclined outwardly, and inclined angle alpha is greater than 10 °, freezing shaft bottom end to dirt
It contaminates area bottom end height and is greater than 2m；
For adjacent freeze wells spacing less than 1 meter, heated well and freezing well spacing are greater than 2 meters；Well is extracted to be less than at a distance from heated well
It 0.5 meter, extracts well and is greater than 1 meter at a distance from freezing well；
The cooling system includes refrigerating cycle pipe and frozen liquid injected system in merging freezing well, frozen liquid injection
The outlet of system freezes well, freezes the inner side and outer side setting manometer of well；
The heating system includes the heating tube being set into heated well and hot steam injected system, and hot steam injected system goes out
Mouth connection heated well；
Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system is exchanged to heating system.
2. the cooling isolation of contaminated soil according to claim 1 and thermal desorption integral system in situ, which is characterized in that
Restoring area is arranged to circle, and the freezing well is respectively positioned on circle in restoring area extension, heated well and extraction well by circumference
All insides.
3. the cooling isolation of contaminated soil according to claim 1 and thermal desorption integral system in situ, which is characterized in that
Freezing liquid injection pipe and extraction pipe are arranged in the freezing well.
4. a kind of cooling isolation of contaminated soil with as described in claims 1 to 3 is any system integrated with thermal desorption in situ
The contaminated soil processing method of system, it is characterised in that: including,
Planning freezing well, heated well and the position step for extracting well: it is wherein evenly spaced apart in soil around restoring area
Arrangement freezing well, freezing well outward install by inclined direction, and tilt angle is not less than 10 °, freezes the depth of well at least below pollution
2 meters of region bottom, the spacing between adjacent freeze wells heated well and extracts well location in the reparation that surrounds of freezing well less than 1 meter
In region, heated well and freezing well spacing are greater than 2 meters；
Cooling tube: being put into freezing well by the step of manufacturing freeze barrier first, and by liquid nitrogen or dry ice injection freezing well, carries out
Directly freezed is then turned on refrigeration compressor, injects frozen liquid to freezing bottom, from extraction freezing stream above freezing well
Body re-starts cooling, realizes the circulation of frozen liquid, while collecting heat using heat exchanger；
Thermal desorption step: after freeze barrier is formed, hot heating tube being put into heated well, is passed through from heating steam and Re Jiao
Then the hot steam of parallel operation extracts pollutant using extraction well；
Recycling step: after using, hot steam being injected in refrigerating cycle pipe, after soil to be frozen thaws, takes out cooling tube.
5. contaminated soil processing method according to claim 4, which is characterized in that the frozen liquid is calcium chloride salt
Water, sodium chloride brine, ethyl alcohol or ethylene glycol.
6. contaminated soil processing method according to claim 4, which is characterized in that planning freezing well, heated well and extracting
In the position step of well, freezing well, heated well and extraction well are punched using tube method is rammed.
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| CN105665433A (en) * | 2016-02-26 | 2016-06-15 | 上海宝发环科技术有限公司 | Soil contamination in-situ desorption method and device |
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