CN106216381A - Freezing isolation and in-situ heat desorbing integral system and the processing method of contaminated soil - Google Patents
Freezing isolation and in-situ heat desorbing integral system and the processing method of contaminated soil Download PDFInfo
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- CN106216381A CN106216381A CN201610635465.3A CN201610635465A CN106216381A CN 106216381 A CN106216381 A CN 106216381A CN 201610635465 A CN201610635465 A CN 201610635465A CN 106216381 A CN106216381 A CN 106216381A
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- well
- freezing
- heated
- cooling
- 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
Abstract
The present invention relates to cooling isolation and in-situ heat desorbing integral system and the contaminated soil processing method of contaminated soil, the cooling system including the multiple freezing well being uniformly equally spaced along restoring area edge, connected, the heated well being positioned at restoring area, the heating system with heated well connection, the extraction well being positioned at restoring area and the suction system being connected with suction system with cooling well；Adjacent freeze wells is smaller than 1 meter, and heated well and freezing well spacing are more than 2 meters；Described cooling system includes inserting the freeze cycle pipe in freezing well and frozen liquid injected system, the outlet freezing well of frozen liquid injected system, and the inner side and outer side of freezing well arranges manometer；Described heating system includes setting into and adds heat pipe and vapours injected system in heated well, the outlet heated well of vapours injected system.Combining freezing isolation barrier technology and Soil Thermal desorption technique, design obtains freezing isolation and the in-situ heat desorbing integral system of contaminated soil.
Description
Technical field
The invention belongs to groundwater remediation field in environmental conservation, be specifically related to the freezing isolation of a kind of contaminated soil with former
Position thermal desorption integral system.
Background technology
In recent years, moving outside along with industrial undertaking, the quantity of the contaminated site in city gradually increases, to nearby residents
Define potential environmental threat, occupy land resource valuable in city, have impact on the sustainable development in city.Pollution Field
There may be miscellaneous pollutant in ground, including heavy metal contaminants and organic pollution etc., partial contamination thing has tired
Long-pending property, easily produces threat to periphery crowd.Repair therefore, it is necessary to carry out this kind of contaminated site administering.Common soil is controlled
Reason recovery technique has ten several, can be divided into physics, chemistry and bioanalysis three major types.
Thermal desorption technology is to process the physical processing techniques of organic material contaminated soil, refers to by direct or indirect heat exchange
Pollution medium and contained organic pollution thereof are heated to enough temperature, organic pollution is transferred to from solid phase soil
Gas phase also makes it evaporate, and vapor phase contaminants processes by the way of burning or condensation adsorption again, rear discharge up to standard.Thermal desorption
Recovery technique, be applicable to the volatility processed soil, the organic pollution of half volatile, is not suitable for processing heavy metal pollution
Thing.
In the improvement repair process of contaminated site, often take migration and the diffusion of quarantine measures limit pollution thing, having
During the thermal desorption of organic pollutants, need to arrange the migration of isolation barrier limit pollution thing, to realize thoroughly taking out of pollutant
Carry.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 simple to operate, the duration is short, can play effective isolation effect, strong adaptability, water proof in a short time
Property is good, environmental effect is little.Freezing isolation barrier is by artificial cooling technology, soil layer, water-bearing stratum around freezing well is freezed,
Form frost wall and isolate subsoil water.Freezing process can be divided into indirect freezing and direct freezing two kinds.Indirect freezing is logical
Cross hypothermic saline circulation, take away the heat in the soil body, make freezing soil.And direct freezing is by liquid nitrogen or dry ice, freezing
Direct gasification in knot pipe, utilizes gasification latent heat and temperature rise sensible heat to realize refrigeration, is discharged in air by gas.
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 desorbing skill
Art, design obtains freezing isolation and the in-situ heat desorbing integral system of contaminated soil.By in a short time around Polluted area
Arrange freezing well, form one impermeable isolation barrier of monolayer, control contaminant transportation in soil or subsoil water, then utilize former
Pollutant in the thermal desorption system extraction soil of position.
For reaching object above, the invention provides cooling isolation and the in-situ heat desorbing integral system of contaminated soil,
The cooling system that connects with cooling well including the multiple freezing wells being uniformly equally spaced along restoring area edge, position
Heating system that heated well in restoring area connects with heated well, be positioned at restoring area extraction well and with suction system
The suction system that system is connected；
Adjacent freeze wells is smaller than 1 meter, and heated well and freezing well spacing are more than 2 meters；Extraction well and the distance of heated well
Less than 0.5 meter, extraction well is more than 1 meter with the distance of freezing well；
Described cooling system includes inserting the freeze cycle pipe in freezing well and frozen liquid injected system, frozen liquid
The outlet freezing well of injected system, the inner side and outer side of freezing well arranges manometer；
Described heating system includes setting into and adds heat pipe and vapours injected system, vapours injected system in heated well
Outlet heated well；
Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system exchanges to heating system.
Integral system includes orienting freezing well, cooling tube, frozen liquid are injected and extracted from system, refrigeration compressor, heat
Steam manufactures device, heat exchanger, heated well, adds heat pipe, extraction well and manometer, and a refrigeration, one heats, passes through
Heat exchanger carries out heat exchange.
Manometer is arranged on the inner side and outer side of freezing well by the present invention, by measuring head monitoring icing barrier
Thickness and the degree of depth.Integral system may be recovered after having used, and is first shut off freezing well, when extending the operation of heated well
Between, vapours is injected in freezing well simultaneously, after soil to be frozen thaws, takes out cooling tube, the freezing for other place every
From.
Preferably, restoring area is arranged to circle, and described freezing well is circumferentially arranged in restoring area extension, heated well and
Extraction well is respectively positioned on inside circumference.
Preferably, described freezing well uses outward-dipping mode to be arranged in soil.
Preferably, described freezing well is arranged freezing liquid ascending pipe and extracts pipe out.
Preferably, described inclined angle alpha is more than 10 °, and freezing shaft bottom end to bottom, contaminated area height is more than 2m.
A kind of contaminated soil processing method, including,
The freezing well of planning, heated well and the position step of extraction well: wherein along restoring area evenly spaced about at soil
The freezing well of arrangement in earth, the degree of depth of freezing well is at least below Polluted area bottom 2 meters, being smaller than between adjacent freeze wells
1 meter, heated well and extraction well location are in the restoring area that freezing well surrounds, and heated well and freezing well spacing are more than 2 meters；Extraction well
Being less than 0.5 meter with the distance of heated well, extraction well is more than 1 meter with the distance of freezing well；
Manufacture the step of freeze barrier: first put into by cooling tube in freezing well, and liquid nitrogen or dry ice injected freezing well,
Carry out direct freezing, be then turned on refrigeration compressor, inject frozen liquid to freezing bottom, extract freezing out from freezing aboveground side
Fluid, re-starts cooling, it is achieved the circulation of frozen liquid, utilizes heat exchanger to collect heat simultaneously；
Thermal desorption step: after freeze barrier is formed, will add heat pipe and put in heated well, be passed through vapours, utilize extraction well
Extraction pollutant.
Preferably also include, recycling step: after making to be finished, hot-air is injected in freeze cycle pipe, soil to be frozen
After defrosting, take out cooling tube.
Preferably, described frozen liquid is calcium chloride brine, sodium chloride brine, ethanol or ethylene glycol.
Preferably, in the position step of the freezing well of planning, heated well and extraction well, freezing well, heated well and extraction well are adopted
With ramming tube method punching, wherein, freezing well incline direction outward is installed.
Freezing well the arrangement that is uniformly equally spaced around restoring area, is arranged in uncontaminated soil or the most untainted
In soil, install with the direction tilted.Refrigerating process uses the mode of indirect refrigeration, utilizes frozen liquid as circulation of fluid band
Walking the heat in soil, play the effect of freezing soil, used frozen liquid is calcium chloride brine, sodium chloride brine, second
Alcohol or ethylene glycol etc..
Manometer is arranged on the inner side and outer side of freezing well by the present invention, by measuring head monitoring icing barrier
Thickness and the degree of depth.Integral system may be recovered after having used, and is first shut off freezing well, when extending the operation of heated well
Between, vapours is injected in freezing well simultaneously, after soil to be frozen thoroughly thaws, take out cooling tube, cold for other place
Freeze isolation.
Present invention design obtains freezing isolation and the in-situ heat desorbing integral system of contaminated soil, and refrigeration compressor produces
Heat be delivered to thermal desorption system by heat exchanger.In restoring area, on-the-spot thermal desorption soil repair system can raise
The soil moisture, vaporizes at soil internal contamination thing, thus promotes the extracting of pollutant.Utilize freezing well around a restoring area
Formed freeze isolation barrier, stop pollutant restoring area migration and flowing (flowing in or out), stop pollutant from
Restoring area flows in uncontaminated soil, prevents contamination.Suppression subsoil water inflow restoring area can reduce to be needed to process
The amount of subsoil water, therefore can reduce the size for the treatment of facility, reduces at groundwater remediation cost.In like manner, contaminant restraining stream
The dynamic operating cost that can reduce on-the-spot thermal desorption repair system.
Freezing well and thermal desorption are designed in same set of system by the present invention, and a refrigeration, one heats, passes through heat exchanger
Carry out heat exchange, save the required ability that heats, and then save rehabilitation expense.Freezing well with heated well should have certain away from
From, in order to avoid freezing soil is rapidly heated, the freezing isolation effect of impact.Heated well should be near extraction well, it is simple to pyrolysis gas
Extracting.The strict distance controlled between freezing well and heated well, prevents the generation of interference problem, causes energy dissipation.
The mode that the present invention uses directly freezing and indirect refrigeration to combine carries out freezing, and water-resisting property is good, environmental effect is little, cold
Freezing effective, the freezing isolation barrier of formation is uniform, and closure is good；It addition, needed for using the freezing isolation barrier of freezing method preparation
Duration shorter, it is possible to meet the requirement quickly repaired.Freezing isolation barrier and on-the-spot in-situ heat desorbing soil repair system two
Person can share a set of drilling device, and required refrigerating and heating combined equipment can be put together, reduces space floor space.Refrigeration
The heat that compressor produces is delivered to thermal desorption system by heat exchanger, reduces the consumption of energy, and then reduction thermal desorption is repaiied
The operating cost of multiple process.
Accompanying drawing explanation
Fig. 1 is freezing well, heated well and extraction well schematic layout pattern in the present invention；
Fig. 2 is freezing well inclined schematic diagram in the present invention；
Fig. 3 is frozen liquid inlet and the schematic diagram of outlet port in freezing well；
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Cooling isolation according to the contaminated soil shown in Fig. 1 to Fig. 3 and in-situ heat desorbing integral system, including along repairing
Cooling system that regional edge connects along the multiple freezing wells being uniformly equally spaced with cooling well, the heating being positioned at restoring area
Well, the heating system with heated well connection, the extraction well being positioned at restoring area and the suction system being connected with suction system；Phase
Adjacent freezing well spacing L is less than 1 meter, and heated well and freezing well spacing are more than 2 meters；Extraction well is less than 0.5 meter with the distance of heated well,
Extraction well is more than 1 meter with the distance of freezing well；Described cooling system includes inserting the freeze cycle pipe in freezing well and freezing
Infusion fluid systems, the outlet freezing well of frozen liquid injected system, the inner side and outer side of freezing well arranges fluid pressure
Meter；Described heating system includes setting into and adds heat pipe and vapours injected system, going out of vapours injected system in heated well
Mouth connection heated well；Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system exchanges to heating system.
Integral system includes orienting freezing well, cooling tube, frozen liquid are injected and extracted from system, refrigeration compressor, vapours manufacture
Device, heat exchanger, heated well, adding heat pipe, extraction well and manometer, a refrigeration, one heats, passes through heat exchanger
Carry out heat exchange.
Manometer is arranged on the inner side and outer side of freezing well by the present invention, by measuring head monitoring icing barrier
Thickness and the degree of depth.Integral system may be recovered after having used, and is first shut off freezing well, when extending the operation of heated well
Between, vapours is injected in freezing well simultaneously, after soil to be frozen thaws, takes out cooling tube, the freezing for other place every
From.
Restoring area is arranged to circle, and described freezing well is circumferentially arranged in restoring area extension, heated well and extraction well
It is respectively positioned on inside circumference.Preferably, described freezing well uses outward-dipping mode to be arranged in soil, and angle is α ＞ 10 °,
Freezing shaft bottom end is to the height h ＞ 2 meters bottom contaminated soil.
The operating procedure of integral system is: the freezing well of (1) planning, heated well and the position of extraction well, and is oriented
Drill-well operation；(2) freeze cycle pipe is put in well, open refrigeration compressor, then in well, inject frozen liquid, carry out cold
Freeze operation；(3) after freeze barrier is formed, heat pipe will be added and put in heated well, be passed through vapours, and utilize extraction well extraction to pollute
Thing.In embodiments, should first run refrigeration system, barrier to be isolated runs heating and the suction system of thermal desorption system after being formed
System.
Freezing well the arrangement that is uniformly equally spaced around restoring area, is arranged in uncontaminated soil or the most untainted
In soil, install with the direction tilted.Refrigerating process uses the most freezing mode combined with indirect refrigeration, first with dry
Ice or liquid nitrogen carry out direct freezing processing, the heat then utilizing frozen liquid to take away in soil as circulation of fluid, play cold
The effect of frozen soil earth, used frozen liquid is calcium chloride brine, sodium chloride brine, ethanol or ethylene glycol etc..
One, preparation of construction
1) job site arranges, and is equipped with water, electricity；
2) the freezing well of planning, heated well and the position of extraction well.
Two, directional drilling
1) using rammer tube method punching, the aperture of freezing well is 10cm, and the aperture of heated well and extraction well is 5cm, freezing well
Direction toward outer incline is installed, offset from perpendicular 10 degree；
2) freezing well is according to circumference, and circular diameter is 20 meters, and the spacing of adjacent freeze wells is 1 meter, the degree of depth of freezing well
Less than Polluted area bottom 2 meters；
3) heated well is positioned at inside circumference, and heated well is 2 meters with the beeline of freezing well.
Three, freeze cycle pipe is installed
1) frozen liquid is injected and extracted from pipe and puts in freezing well, then liquid nitrogen is added in freezing well, open refrigeration
Compressor, injects frozen liquid in freezing well, the most constantly extracts the frozen liquid on upper strata out；
2) frozen liquid circulation operation is constantly carried out.
Four, freezing isolation barrier monitoring
1) manometer is arranged on the inner side and outer side of the well that freezes；
2) by measuring thickness and the degree of depth of head monitoring icing barrier.
Five, pollutant extraction
1), after freeze barrier is formed, heat pipe will be added and put in heated well；
2) open heating system, in heated well, be passed through hot-air, by extraction well extraction pollutant.
Six, the recovery of integral system
1) first the cooling fluid in freeze cycle pipe is extracted out；
2) hot-air is injected in freeze cycle pipe, after soil to be frozen thaws, take out cooling tube.
Below preferred embodiment to the invention is illustrated, but the invention is not limited to described
Embodiment, those of ordinary skill in the art can also make all equivalents on the premise of the invention spirit
Modification or replacement, these equivalent modifications or replacement are all contained in the application claim limited range.
Claims (9)
1. the cooling isolation of contaminated soil and in-situ heat desorbing integral system, it is characterised in that
The cooling system that connects with cooling well including the multiple freezing wells being uniformly equally spaced along restoring area edge, it is positioned at and repaiies
The heating system that heated well in multiple region connects with heated well, the extraction well being positioned at restoring area and with suction system phase
Suction system even；
Adjacent freeze wells is smaller than 1 meter, and heated well and freezing well spacing are more than 2 meters；Extraction well is less than with the distance of heated well
0.5 meter, extraction well is more than 1 meter with the distance of freezing well；
Described cooling system includes inserting the freeze cycle pipe in freezing well and frozen liquid injected system, and frozen liquid injects
The outlet freezing well of system, the inner side and outer side of freezing well arranges manometer；
Described heating system includes setting into and adds heat pipe and vapours injected system, going out of vapours injected system in heated well
Mouth connection heated well；
Heating system and cooling system carry out cold fluid and hot fluid exchange, and the heat of cooling system exchanges to heating system.
The cooling isolation of contaminated soil the most according to claim 1 and in-situ heat desorbing integral system, it is characterised in that
Restoring area is arranged to circle, and described freezing well is circumferentially arranged in restoring area extension, heated well and extraction well and is respectively positioned on circle
Inside week.
The cooling isolation of contaminated soil the most according to claim 1 and in-situ heat desorbing integral system, it is characterised in that
Described freezing well uses angled manner to be arranged in soil.
The cooling isolation of contaminated soil the most according to claim 3 and in-situ heat desorbing integral system, it is characterised in that
Described inclined angle alpha is more than 10 °, and freezing shaft bottom end to bottom, contaminated area height is more than 2m.
The cooling isolation of contaminated soil the most according to claim 3 and in-situ heat desorbing integral system, it is characterised in that
Described freezing well is arranged freezing liquid ascending pipe and extracts pipe out.
6. the cooling isolation system integrated with in-situ heat desorbing of the contaminated soil used as described in claim 1 to 5 is arbitrary
The contaminated soil processing method of system, it is characterised in that: include,
The freezing well of planning, heated well and the position step of extraction well: wherein along restoring area evenly spaced about in soil
The freezing well of arrangement, the degree of depth of freezing well at least below Polluted area bottom 2 meters, is smaller than 1 meter between adjacent freeze wells,
Heated well and extraction well location are in the restoring area that freezing well surrounds, and heated well and freezing well spacing are more than 2 meters；
Manufacture the step of freeze barrier: first put into by cooling tube in freezing well, and liquid nitrogen or dry ice are injected freezing well, carry out
The most freezing, it is then turned on refrigeration compressor, injects frozen liquid to freezing bottom, extract freezing stream out from freezing aboveground side
Body, re-starts cooling, it is achieved the circulation of frozen liquid, utilizes heat exchanger to collect heat simultaneously；
Thermal desorption step: after freeze barrier is formed, adds heat heat pipe and puts in heated well, is passed through to come from and heats steam and Re Jiao
The vapours of parallel operation, then utilizes extraction well to extract pollutant.
Contaminated soil processing method the most according to claim 6, it is characterised in that also include:
Recycling step: after making to be finished, injects in freeze cycle pipe by vapours, after soil to be frozen thaws, takes out cooling tube.
Contaminated soil processing method the most according to claim 6, it is characterised in that described frozen liquid is calcium chloride salt
Water, sodium chloride brine, ethanol or ethylene glycol etc..
Contaminated soil processing method the most according to claim 6, it is characterised in that the freezing well of planning, heated well and extracting
In the position step of well, freezing well, heated well and extraction well use and ram tube method punching, wherein, and freezing well incline direction outward peace
Dress, angle of inclination is not less than 10 °.
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| CN201610635465.3A CN106216381B (en) | 2016-08-05 | 2016-08-05 | The freezing isolation of contaminated soil and thermal desorption integral system in situ and processing method |
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| CN201610635465.3A CN106216381B (en) | 2016-08-05 | 2016-08-05 | The freezing isolation of contaminated soil and thermal desorption integral system in situ and processing method |
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| CN106734153A (en) * | 2017-01-18 | 2017-05-31 | 北京高能时代环境技术股份有限公司 | For thermal desorption processing system in situ and method that contaminated soil is carried out with heat exchange pattern |
| CN106734133A (en) * | 2017-01-05 | 2017-05-31 | 中国矿业大学 | A kind of method that engineering with artificial freezing method closes displacement pollutant in soil |
| CN107185955A (en) * | 2017-05-12 | 2017-09-22 | 清华大学 | Contaminated soil original position eddy current type thermal desorption system |
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