CN107626730A - A kind of extracting gang of wells for contaminated site in-situ immobilization engineering - Google Patents
A kind of extracting gang of wells for contaminated site in-situ immobilization engineering Download PDFInfo
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- CN107626730A CN107626730A CN201710879454.4A CN201710879454A CN107626730A CN 107626730 A CN107626730 A CN 107626730A CN 201710879454 A CN201710879454 A CN 201710879454A CN 107626730 A CN107626730 A CN 107626730A
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Abstract
The invention discloses a kind of extracting gang of wells for contaminated site in-situ immobilization engineering, and comprising extracting house steward and some extracting well casings being respectively connected with extracting house steward, the other end for extracting house steward is provided with vavuum pump；Extracting well casing includes some vertical shaft type extraction wells being vertically mounted in contaminated site and some horizontal well formula extraction wells being horizontally arranged in Polluted area topsoil.Opened up on extracting well casing some along the evenly spaced sieve aperture in well casing direction or screen slot.If vertical shaft type extraction well be separately mounted to pre-set in contaminated site by ground dry ground hole downwards；Vertical shaft type extraction well includes association extraction well and independent extraction well, and each association extraction well and a heated well are arranged in a native hole, and each independent extraction well is provided separately within a native hole.Provided by the present invention for the extracting gang of wells of contaminated site in-situ immobilization engineering, there is outstanding advantages of soil gas can be trapped effectively, equipment is simple and safe, secondary pollution is controllable, repairing effect is good.
Description
Technical field
The present invention relates to a kind of extraction device for contaminated site reparation, in particular it relates to which a kind of be used for contaminated site
The extracting gang of wells of in-situ immobilization engineering.
Background technology
It is organic that thermal desorption (Thermal Desorption) technology is widely portable to volatile organic matter, half volatile
Thing, the original position of petroleum hydrocarbon or mercury pollution place or showering.The technology is by way of directly or indirectly heating, by dirt
Dye soil and/or underground water are heated to the boiling point close to even more than target contaminant, are held by control system temperature and high temperature
The continuous time selectively promotes target contaminant to desorb, gasify, volatilize, decompose or increase its mobility, makes target contaminant
Separate, remove with soil media, so as to realize the purpose of contaminated site reparation.
Thermal desorption recovery technique in situ can be implemented in contaminated site original position, without carrying out the work such as excavating to contaminated soil
Industry, mainly it is made up of place In Situ Heating unit, pollutant extracting with recovery unit and waste water/exhaust gas treatment unit etc..Its
Middle place In Situ Heating unit is the core of thermal desorption technology in situ, and it passes through in the venue by electric energy, heat energy or chemical energy
Generated heat etc. various forms of energy with In-situ resistance, in-situ heat conduction heating or situ steam after electric heating conversion or burning heat production
The modes such as injected with heated convert or are transferred to contaminated site, contaminated soil and/or underground water is progressively heated up and reach target
Repair temperature and maintain certain time, to remove so as to which soil media of the target contaminant from script preservation is separated.In high temperature
Under the conditions of extraction system can by target contaminant by the form of underground water or SOIL GAS from underground pollution zone-transfer to ground
Reclaimed, or pass through qualified discharge after waste water/exhaust gas treatment unit processing.Pollution level and field of the technology to pollutant
Ground geology and hydrogeologic condition are insensitive, can effectively repair the Pollution Field of heavily contaminated, geology and complicated hydrogeological conditions
Ground.
At present, thermal desorption recovery technique in situ at home contaminated site repair in engineer applied it is still relatively limited, limit
The main reason for making its popularization and application be the provisional extensive electricity consumption in part place be not easy to obtain, vapor injection heating desorption
Technology is vulnerable to that the limitation of Geological condition and the target temperature upper limit, energy cost needed for In Situ Heating be higher, place underground
The soil gas that current are difficult to control, are desorbed out is not easy effectively trapping and pollution environment of escaping, the pollutant that extracts condense back
Receive that less efficient, caused high humility waste gas is not disposable, the complicated all difficulties such as more intractable of wastewater property.
The content of the invention
It is an object of the invention to provide a kind of extraction device for contaminated site reparation, and skill is repaired using thermal desorption in situ
Art, solve existing issue, effectively repair the contaminated site of heavily contaminated, geology and complicated hydrogeological conditions.
In order to achieve the above object, the invention provides a kind of extracting gang of wells for contaminated site in-situ immobilization engineering,
Wherein, described extracting gang of wells includes extracting house steward and some extracting well casings being respectively connected with extracting house steward, extracts house steward's
The other end is provided with vavuum pump；Described extracting well casing includes some vertical shaft type extraction wells being vertically mounted in contaminated site, with
And it is horizontally arranged at some horizontal well formula extraction wells in Polluted area topsoil.Vertical shaft type extraction well and horizontal well formula extraction well hang down
Orthogonal mistake is distributed in in a piece of contaminated site and covering whole Polluted area.By vavuum pump, extracting well casing and extracting house steward's group
Into vacuum extraction facility.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described vertical shaft type extraction well, its well
Opened up on pipe some along the evenly spaced sieve aperture in well casing direction or screen slot；The setting span of sieve aperture or screen slot on well casing is vertically covered
Cover whole Polluted area and be provided with bottom, bottom thickness about 30cm than Polluted area bottom depth 0.3-0.5m, the bottom of well casing.Well
Pipe does not open up sieve aperture or screen slot above Polluted area to the part between ground, i.e. top uncontamination region is the well of not perforate
Pipe.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described vertical shaft type extraction well difference
Pre-set in contaminated site by if in ground dry ground hole downwards, well spacing is 1-3m；Described vertical shaft type is taken out
Carry well and include two kinds of association extraction well and independent extraction well, each association extraction well and a heated well are arranged on a native hole
Interior, its bottom is than heating the depth of bottom beyond 1m or so；Each independent extraction well is provided separately within a native hole, independent
Extraction well is built up between heated well.Preferably, vertical shaft type extraction well in horizontal layout by triangle or square in the form of
Arrangement.Heated well is tubular structure, and it is connected with manufacturing the hot-blast stove of hot blast, and high-temperature hot-air passes through air-introduced machine caused by hot-blast stove
Suction function introduce heated well and heated, high-temperature hot-air completes indirect heat exchange by heated well and soil, so as to pass through heat
The mode of conduction heats the soil and/or underground water temperature on well casing periphery to improve, and the hot blast for completing heat exchange is arranged using air-introduced machine
Go out.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described vertical shaft type extraction well, its well
Bentonite to ground is filled filled with quartz sand between the lateral wall of pipe and the madial wall in native hole and at the top of quartz sand to be sealed
Hole.The packed height of quartz sand and sieve aperture on the well casing of vertical shaft type extraction well or the setting span scope of screen slot are basically identical.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described association extraction well, its hole diameter
For 25-40cm；The top of described association extraction well is externally provided with a threeway on ground, i.e. association extraction well is set after elevating above the soil
A threeway is put, two ports of export of threeway are respectively provided with valve, one of port of export connection extracting house steward, another port of export
Straight-through air or compressed air gas source.The starting stage is run in vacuum extraction facility, is opened between association extraction well and extracting house steward
Valve, close the valve that is connected with air or compressed air gas source；In the system operation middle and later periods, close between extracting house steward
Valve, opens the valve that association extraction well is connected with air or compressed air gas source, and fresh air or injection are sucked from air
Compressed air is as disturbance wind.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described independent extraction well, its hole diameter
For 80-100cm, described independent extraction well is connected with extracting house steward, and valve is provided between independent extraction well and extracting house steward.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described horizontal well formula extraction well difference
It is arranged in some horizontal channels dug in Polluted area topsoil, the hole diameter of described horizontal well formula extraction well is 45-
55cm, preferably 50cm, the depth of burying of horizontal well formula extraction well to ground is 0.2-0.5m, and well spacing is 2-5m, level covering
Whole Polluted area surface.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described horizontal well formula extraction well, its well
Open up some along the evenly spaced sieve aperture in well casing direction or screen slot on pipe, well casing both ends are respectively equipped with branch pipe, by branch pipe with taking out
Carry house steward to be connected, branch pipe is provided with switch valve.Quartz sand is filled between the lateral wall and soil of well casing, above quartz sand
Filling bentonite in groove.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described horizontal well formula extraction well, its institute
Contaminated site ground on be provided with concrete layer, the bottom surface of concrete layer be located at bentonite above horizontal well formula extraction well it
On；Described concrete layer is divided into two layers up and down；Lower floor is cellular concrete, thickness 15-30cm；Upper strata is common coagulation
Soil, thickness 10-20cm.Normal concrete (normal concrete) refers generally to using cement as major gelled material, with water,
Sand, stone, chemical admixture and mineral admixture are mixed if necessary, is coordinated by proper proportion, by uniform stirring, closely knit shaping
And the artificial stone that maintenance hardening forms.Cellular concrete (Foamed Cement) will be sent out by the foamed system of air bubble machine
Infusion is mechanically fully foamed, and foam is uniformly mixed with cement mortar, is then carried out by the pumping system of foaming machine
Cast-in-place construction or mould molding, a kind of novel light insulation material containing a large amount of sealed porositys formed through natural curing.
The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, described concrete layer is perpendicular in setting
Corresponding hole is reserved in the position of well formula extraction well, and steel service sleeve or iron hoop, vertical shaft type extracting are provided with described hole
Filling is swollen through described steel service sleeve or iron hoop and steel service sleeve or iron hoop after concrete curing for well
Profit soil is sealed.
There is advantages below provided by the present invention for the extracting gang of wells of contaminated site in-situ immobilization engineering：
The extracting gang of wells is primarily adapted for use in various volatile organic matters, semi-volatile organic matter, petroleum hydrocarbon or mercury pollution
The soil underground water in-situ immobilization engineering in place, easy to control with place subsurface flow, soil gas can be trapped effectively, and system is set
For outstanding advantages of simple and safe, secondary pollution is controllable, and repairing effect is good.
Brief description of the drawings
Fig. 1 is the structural representation of the extracting gang of wells for being used for contaminated site in-situ immobilization engineering of the present invention.
Fig. 2 is the structural representation of the extracting well casing for being used for contaminated site in-situ immobilization engineering of the present invention.
Fig. 3 is the enlarged section of the horizontal well formula extraction well for contaminated site in-situ immobilization engineering of the present invention.
Fig. 4 is the section partial enlarged drawing of the horizontal well formula extraction well for contaminated site in-situ immobilization engineering of the present invention.
Embodiment
The embodiment of the present invention is further described below in conjunction with accompanying drawing.
As shown in figure 1, provided by the present invention for the extracting gang of wells of contaminated site in-situ immobilization engineering, extracting house steward is included
1 and some it is provided with vavuum pump 3 with the extracting well casing 2 that is respectively connected with of extracting house steward 1, the other end of extracting house steward 1；Extract well casing 2
Comprising some vertical shaft type extraction wells 4 being vertically mounted in contaminated site, and it is horizontally arranged in the topsoil of Polluted area 5
Some horizontal well formula extraction wells 6.Vertical shaft type extraction well 4 and the horizontal vertical interlaced of well formula extraction well 6 are distributed in a piece of contaminated site
It is interior and cover whole Polluted area 5.Vacuum extraction facility is formed by vavuum pump 3, extracting well casing 2 and extracting house steward 1.
As shown in Fig. 2 opened up on the well casing of vertical shaft type extraction well 4 some along the evenly spaced sieve aperture in well casing direction or screen slot
7；The setting span of sieve aperture or screen slot 7 on well casing vertically covers whole Polluted area 5 and than the bottom depth 0.3- of Polluted area 5
0.5m, the bottom of well casing are provided with bottom 8, the thickness of bottom 8 about 30cm.Well casing is above Polluted area 5 to the part between ground
Sieve aperture or screen slot 7 are not opened up, i.e. top uncontamination region is the well casing of not perforate.
If vertical shaft type extraction well 4 be separately mounted to pre-set in contaminated site by ground dry ground hole downwards, well
Spacing is 1-3m；Vertical shaft type extraction well 4 includes 10 two kinds of association extraction well 9 and independent extraction well, each association extraction well 9 and one
Individual heated well 11 is arranged in a native hole, and its bottom exceeds 1m or so than the depth of the bottom of heated well 11；Each independent extracting
Well 10 is provided separately within a native hole, and independent extraction well 10 is built up between heated well 11.Preferably, vertical shaft type extraction well 4
Arranged in horizontal layout in the form of triangle or square.Heated well 11 is tubular structure, its heat with manufacturing hot blast
Wind furnace connects, and high-temperature hot-air caused by hot-blast stove introduces heated well 11 by the suction function of air-introduced machine and heated, high warm
Wind completes indirect heat exchange by heated well 11 and soil, so as to improve the well casing periphery of heated well 11 by way of heat transfer
Soil and/or underground water temperature, complete heat exchange hot blast using air-introduced machine discharge.
Filled with quartz sand 12 and in quartz sand between the lateral wall of the well casing of vertical shaft type extraction well 4 and the madial wall in native hole
12 top filling bentonite 13 to ground carry out sealing of hole.The packed height of quartz sand 12 on the well casing of vertical shaft type extraction well 4 with sieving
The setting span scope of hole or screen slot 7 is basically identical.
The hole diameter of association extraction well 9 is 25-40cm；The top of association extraction well 9 is externally provided with a threeway, i.e. companion on ground
Raw extraction well 9 sets a threeway 14 after elevating above the soil, and two ports of export of threeway 14 are respectively provided with valve, one of port of export
Provided with the first valve 15, connection extracting house steward 1, another port of export is provided with the second valve 16, leads directly to air or compressed air gas
Source.The starting stage is run in vacuum extraction facility, opens the first valve 15 between association extraction well 9 and extracting house steward 1, is closed
The second valve 16 being connected with air or compressed air gas source；In the system operation middle and later periods, close between extracting house steward 1 the
One valve 15, opens the second valve 16 that association extraction well 9 is connected with air or compressed air gas source, and fresh sky is sucked from air
Gas or injecting compressed air are as disturbance wind.
The hole diameter of independent extraction well 10 is 80-100cm, and independent extraction well 10 is connected with extracting house steward 1.Independent extraction well 10
The 3rd valve 17 is provided between extracting house steward 1.
Horizontal well formula extraction well 6 is separately positioned in some horizontal channels 18 dug in the topsoil of Polluted area 5, horizontal well
The hole diameter of formula extraction well 6 is 45-55cm, preferably 50cm, and the depth of burying of horizontal well formula extraction well 6 to ground is 0.2-0.5m,
Well spacing is 2-5m, and level covers the whole surface of Polluted area 5.
Opened up on the well casing of horizontal well formula extraction well 6 some along the evenly spaced sieve aperture in well casing direction or screen slot 7, well casing both ends
Branch pipe 19 is respectively equipped with, is connected by branch pipe 19 with extracting house steward 1, branch pipe 19 is provided with switch valve 20.The lateral wall of well casing
Quartz sand 12 is filled between soil, bentonite 13 is filled in the groove 18 of the top of quartz sand 12.Referring to shown in Fig. 3 and Fig. 4.
The ground of contaminated site where horizontal well formula extraction well 6 is provided with concrete layer 21, the bottom surface position of concrete layer 21
On bentonite 13 above the horizontal well formula extraction well 6；Concrete layer 21 divides for upper and lower two layers；Lower floor is cellular concrete 22,
Thickness is 15-30cm；Upper strata is normal concrete 23, thickness 10-20cm.Normal concrete (normal concrete) one
As refer to using cement as major gelled material, and water, sand, stone, chemical admixture and mineral admixture are mixed if necessary, by appropriate
Ratio coordinates, the artificial stone formed by uniform stirring, closely knit shaping and maintenance hardening.Cellular concrete (Foamed
Cement it is) that foaming agent is mechanically fully foamed by the foamed system of air bubble machine, and foam is uniform with cement mortar
Mixing, then carry out cast-in-place construction by the pumping system of foaming machine or mould molding, the one kind formed through natural curing contain
There is the novel light insulation material of a large amount of sealed porositys.
Concrete layer 21 is setting the position of vertical shaft type extraction well 4 to reserve corresponding hole, and service sleeve is provided with hole
24, preferably steel service sleeve or iron hoop, vertical shaft type extraction well 4 through steel service sleeve or iron hoop and with the pre-buried set of steel
Filling bentonite 13 is sealed after concrete curing between pipe or iron hoop.
With reference to embodiment to doing more to enter provided by the present invention for the extracting gang of wells of contaminated site in-situ immobilization engineering
One step describes.
Embodiment 1
A kind of extracting gang of wells for contaminated site in-situ immobilization engineering, include extracting house steward 1 and some and extracting house steward 1
The extracting well casing 2 being respectively connected with, the other end of extracting house steward 1 are provided with vavuum pump 3.It is total by vavuum pump 3, extracting well casing 2 and extracting
Pipe 1 forms vacuum extraction facility.
Vacuum extraction is realized by the vavuum pump 3 on ground and installation extracting well casing 2 in the venue, passes through vavuum pump 3
Negative pressure caused by operation by the pollutant separated from soil media in the form of underground water or soil gas through extracting
Well is drawn to ground by extracting house steward 1 and handled.Vacuum extraction facility typically carries out the extracting fortune of underground water prior to heating
OK, Waste Water Treatment is sent to handle after extracting the underground water of Polluted area 5 out ground as much as possible, to save subsequent heat underground
The energy of consumption needed for water, reduce processing load.Extraction well is generally stainless steel, is divided to two kinds of forms, one kind is vertical shaft type
Extraction well 4, is vertically mounted in contaminated site；One kind is horizontal well formula extraction well 6, is horizontally arranged at the topsoil of Polluted area 5
It is interior.
Vertical shaft type extraction well 4 is divided to two kinds of forms again, and a kind of association to be arranged on heated well 11 in same native hole is taken out
Carry well 9, hole diameter is identical with the depth of heated well 11 in 25-40cm；A kind of is the independent extraction well being built up between heated well 11
10, hole diameter exceeds 1m in 80-140cm, the depth than heated well 11.Sieve aperture or screen slot 7 are opened on the well casing of vertical shaft type extraction well 4, is opened
Hole span vertically covers whole Polluted area 5 and also goes out about 0.3-0.5m deeply than the bottom of Polluted area 5, should additionally add thickness
About 30cm bottom 8, bottom 8 by not perforate well casing and its under silently form, top uncontamination region be not perforate well
Pipe.Independent extraction well 10 is directly connected with extracting house steward 1；The 3rd valve 17 is provided between independent extraction well 10 and extracting house steward 1.
Association extraction well 9 sets a threeway 14 after elevating above the soil, both ends outlet is respectively provided with valve and flange, and one end is provided with the first valve
15, connection extracting house steward 1, the other end is provided with the second valve 16, leads directly to air or connection compressed air gas source.In system design
The distribution of extracting well casing 2 can be optimized, pass through the setting of association extraction well 9 and independent extraction well 10, difference consolidation system " focus "
The extracting of " cold spot " pollutant is collected.
In the system operation starting stage, pollutant concentration is higher in the Soil Surrounding of heated well 11, and the soil moisture is heating
The lower and can of the effect of well 11 rises quickly, and a large amount of pollutants can be transferred in soil gas from solid phase of soil.In view of independent extracting
Well 10 is again distant from this region, and the pollutant in soil gas is difficult only effectively trapping by independent extraction well 10.At this moment
Need to open the first valve 15 between association extraction well 9 and extracting house steward 1, close what is be connected with air or compressed air gas source
Second valve 16, the pollutant in the regional soil gas is quickly discharged through association extraction well 9 by vacuum action, prevents from polluting
Thing escapes into air and causes secondary pollution.Additionally due to the regional temperature is higher, is concentrated on and heated by association extraction well 9
Partial contamination thing near well 11 reaction such as can be pyrolyzed or hydrolyze under the action of heat and be consumed, so as to effective
Reduce the load of follow-up ground pollution treatment facility.In the system operation middle and later periods, the Soil Surrounding temperature of heated well 11 can reach first
To target temperature, pollutant in soil concentration has been significantly reduced, and the regional soil temperature apart from heated well 11 farther out
Target temperature can not yet be reached.Now need to close and extract the first valve 15 between house steward 1, open association extraction well 9 with
Air or the second valve 16 of compressed air gas source connection, are intermittently injecting compressed air, or by independent extraction well 10 on ground
Vacuum suction effect caused by lower can take out a part of fresh air from air through association extraction well 9 and enter underground, so as to increase
The thermal convection current effect of soil, improves heat-transfer effect, contributes to away from heated well 11 area between heated well 11 and independent extraction well 10
The soil in domain is rapidly heated.Meanwhile the compressed air through association extraction well 9 into underground can also play the work of disturbance wind
With reducing the concentration of pollutant in soil gas in the microenvironment of soil particle surface, so as to reduce its partial pressure, soil can be promoted
The desorption of the pollutant of absorption, improve repairing effect.
Horizontal well formula extraction well 6 is separately positioned in some horizontal channels 18 dug in the topsoil of Polluted area 5, buried depth
In 0.3-0.5m or so, hole diameter is typically in 50cm or so, and well spacing is typically in 2-5m, it is necessary to cover the whole surface of Polluted area 5.
Sieve aperture or screen slot 7 are opened on well casing, well casing both ends are connected by branch pipe 19 with extracting house steward 1, are mainly used in trapping vertical shaft type extracting
Well 4 fails the soil gas trapped, further realizes the control to soil pollutant to earth's surface loss, effectively prevents secondary dirt
Dye.Branch pipe 19 is provided with switch valve 20.
Realized by the form of the setting of restoring area surface in the original location concrete layer 21 to processing region rainwash
Control and the control of soil gas.The horizontal extent of earth's surface concrete layer 21 can typically exceed each side 1-2m of restoring area, with mixing
Solidifying native mixing pile is tightly connected.Concrete layer 21 is set two layers, and lower floor is cellular concrete 22, thickness 15-30cm, primarily serve every
Water, trapping and heat-insulated effect, prevent surface rain etc. from entering processing region, prevent soil gas from escaping or preventing periphery
Air enters extraction system, while reduces the upward heat loss of the multiple processing region of hot repair as far as possible；Upper strata normal concrete 23, thickness
10-20cm, primarily serve the effect of water proof and trapping.
Heated well 11 and vertical shaft type extraction well 4 installed in underground can be upward through after concrete layer 21 and ground installation
Connection.Concrete layer 21 sets service sleeve 24 in the equal preformed hole in the position that all pipelines pass through, hole in installation process, excellent
Elect iron hoop as, heated well 11 and vertical shaft type extraction well 4 pass through iron hoop, swollen by filling after concrete curing between iron hoop and well casing
Moisten soil 13 to seal.So can effectively it reduce because soil and pipe fitting thermal expansion cause concrete bodies to rupture in heating process,
Influence sealing effectiveness.
Embodiment 2
A kind of extracting gang of wells for contaminated site in-situ immobilization engineering, include extracting house steward 1 and some and extracting house steward 1
The extracting well casing 2 being respectively connected with, the other end of extracting house steward 1 are provided with vavuum pump 3.It is total by vavuum pump 3, extracting well casing 2 and extracting
Pipe 1 forms vacuum extraction facility.Well casing 2 is extracted by heating resisting metal soft pipe connection to house steward 1 is extracted, extracting house steward 1 is by certain
Slope design.
In-situ heat restoring area caused soil gas after heating is collected by extracting gang of wells, including two kinds of installation shapes
Formula, one kind is vertical shaft type extraction well 4, is vertically mounted in contaminated site；One kind is horizontal well formula extraction well 6, is horizontally arranged at dirt
Contaminate in the topsoil of region 5；Extracting well casing 2 uses stainless steel.
Vertical shaft type extraction well 4 is divided into association extraction well 9 and independent 10 two kinds of forms of extraction well, the hole diameter of association extraction well 9 again
25cm, it is arranged on heated well 11 in a native hole, fitting depth is consistent, and top sets threeway 14, and both ends outlet is respectively provided with valve
Door, one end are provided with the first valve 15, connection extracting house steward 1, and the other end is provided with the second valve 16, connects compressed air gas source；Solely
The vertical hole diameter 100cm of extraction well 10, it is arranged between heated well 11 (" cold spot " farthest apart from neighbouring thermal source), according to site condition
It is evenly arranged, fitting depth, which exceedes, repairs depth 1m, is used before heating as dewatering well；Dewatering well is for lowering of watertable
The well beaten, is put into water pump groundwater abstraction, reduces the water level of underground water after having beaten.Extracted by optimizing association in system design
The distribution of well 9 and independent extraction well 10 is set, and is extracted in the different phase regulation association extraction well 9 of heating operation with independent
The 3rd valve 17 between well 10 and extracting well casing 2, the respectively extracting of consolidation system " focus " and " cold spot " pollutant are collected.
The heating operation starting stage, under high temperature action, a large amount of pollutants can be consolidated from soil in the Soil Surrounding of heated well 11
Into soil gas, this partial contamination thing is difficult that effectively trapping extracts, it is necessary to open association by independent extraction well 10 for phase transfer
The first valve 15 between well 9 and extracting house steward 1, the second valve 16 being connected with compressed air gas source is closed, is made by vacuum
With the pollutant quickly discharged through association extraction well 9 in the neighboring area soil gas of heated well 11；Heating operation middle and later periods, heating
The neighboring area soil of well 11 has reached target temperature, between pollutant concentration is significantly reduced, it is necessary to close and extract house steward 1
First valve 15, interval open the injecting compressed air of the second valve 16 that association extraction well 9 is connected with compressed air gas source, increase
The thermal convection current effect of soil, improves heat-transfer effect between heated well 11 and independent extraction well 10, accelerates " cold spot " heating；Meanwhile pass through
The fresh air that association extraction well 9 enters underground can also play disturbance wind action, reduce soil particle surface micro-loop
On border in soil gas pollutant concentration (partial pressure), promote the desorption of soil pollutant, improve repairing effect.
Horizontal well formula extraction well 6 buried depth 0.2m, hole diameter 50cm, well spacing 2m are, it is necessary to cover the whole surface of Polluted area 5.
Well casing both ends are connected by branch pipe 19 with extracting house steward 1, and set switch valve 20, can be chosen whether to connect according to operating condition
Enter extraction system.Horizontal well formula extraction well 6 is mainly used in trapping the soil gas that vertical shaft type extraction well 4 fails to trap, realization pair
Soil pollutant effectively prevents secondary pollution to the control of earth's surface loss.
The well casing of the well casing of vertical shaft type extraction well 4 and horizontal well formula extraction well 6 is open-porous metal pipe, wherein, extract well casing 2
Perforate pipeline section from below ground 0.5m downwards until bottom above 0.3m at, horizontal extraction tube is in addition to pipeline junction
Perforate or joint-cutting pipeline section provided with sieve aperture or screen slot 7.
The extracting gang of wells when mounted, carries out wellhole probing according to the arrangement of vertical shaft type extraction well 4 first；Often complete one
The probing of wellhole, the well casing installation of this mouthful of well is carried out immediately, the quartz sand 12 of 2-5mm particle diameters is inserted after well casing is in place, in wellhole
Until below ground 300mm, and fill bentonite 13 to ground and carry out sealing of hole.
After the installation for completing vertical shaft type extraction well 4, restoring area carries out precipitation in the original location, i.e., extracts underground by water pump
Water, reduce the water level of underground water.Precipitation depth is at least 1m below reparation depth；Reparation place provided with independent extraction well 10,
Independent extraction well 10 can be used early stage in reparation as dewatering well.
After the completion of precipitation, arranged in gang of wells gap and excavate the deep horizontal type extraction well grooves 18 of the wide 200mm of 100mm, groove
The quartz sand 12 of laying 10cm thickness 2-5mm particle diameters in 18, and installation horizontal type extracting well casing 2 is laid among layer of sand, and fill
Bentonite 13 thick 10cm carries out groove 18 and closed；Groove 18 excavate caused by soil pave and do not excavating region.
After the installation for completing horizontal type extracting groove 18, restoring area successively lays two layers of thick coagulation of each 20cm in the original location
Soil layer 21, wherein, made with the concrete layer 21 that soil to be repaired directly contacts using cellular concrete 22, complete maintenance
Up lay the thick normal concretes 23 of 20cm again afterwards；In the process of deployment of concrete layer 21, in vertical shaft type extraction well 4
Pre-buried 50mm bigger than well casing diameter service sleeve 24, preferably steel service sleeve around well casing, it is between well casing by filling out
Fill bentonite 13 to seal, effectively reduce the possibility for causing concrete bodies to rupture due to soil and pipe fitting thermal expansion in heating process
Property.
Provided by the present invention for the extracting gang of wells of contaminated site in-situ immobilization engineering, belong to combustion-type original position thermal desorption and repair
A necessaries in recovering technology.Combustion-type original position thermal desorption recovery technique is by different fuel by way of heat production of burning
The chemical energy of (oil gas, natural gas or diesel oil etc.) is converted to heat energy, directly passes through heat using high-temp combustion flue gas as heat carrier
The mode of conduction conducts heat to underground via the heated well of contaminated site installation in situ, so as to improve place temperature and realize
The purpose that the desorption of target contaminant and extracting remove.There is the energy easily to obtain, be for combustion-type original position thermal desorption recovery technique
System is safe and reliable, thermal desorption temperature is high, repairing effect is good, and pollutant concentration such as does not rebound at the outstanding feature after reparation, application prospect
It is wide.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of extracting gang of wells for contaminated site in-situ immobilization engineering, it is characterised in that described extracting gang of wells is included and taken out
House steward and some extracting well casings being respectively connected with extracting house steward are carried, the other end for extracting house steward is provided with vavuum pump；Described takes out
Carry well casing and include some vertical shaft type extraction wells being vertically mounted in contaminated site, and be horizontally arranged at Polluted area topsoil
Some horizontal well formula extraction wells in earth.
2. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 1, it is characterised in that described is perpendicular
Well formula extraction well, open up on its well casing some along the evenly spaced sieve aperture in well casing direction or screen slot；Sieve aperture or screen slot are on well casing
Setting span vertically cover whole Polluted area and be provided with bottom than Polluted area bottom depth 0.3-0.5m, the bottom of well casing,
Well casing does not open up sieve aperture or screen slot above Polluted area to the part between ground.
3. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 2, it is characterised in that described is perpendicular
Well formula extraction well be separately mounted to pre-set in contaminated site by if in ground dry ground hole downwards, well spacing is 1-3m；
Described vertical shaft type extraction well includes two kinds of association extraction well and independent extraction well, and each association extraction well is set with a heated well
Put in a native hole, each independent extraction well is provided separately within a native hole.
4. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 3, it is characterised in that described is perpendicular
Quartz sand is filled between the madial wall in well formula extraction well, the lateral wall of its well casing and native hole and swelling is filled at the top of quartz sand
Soil to ground carries out sealing of hole.
5. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 3, it is characterised in that described companion
Raw extraction well, its hole diameter is 25-40cm；The top of described association extraction well is externally provided with a threeway on ground, and the two of threeway
The individual port of export is respectively provided with valve, one of port of export connection extracting house steward, and another port of export leads directly to air.
6. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 3, it is characterised in that described is only
Vertical extraction well, its hole diameter are 80-100cm, and described independent extraction well is connected with extracting house steward.
7. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 1, it is characterised in that described horizontal stroke
Well formula extraction well is separately positioned in some horizontal channels dug in Polluted area topsoil, described horizontal well formula extraction well
Hole diameter be 45-55cm, the depth of burying of horizontal well formula extraction well to ground is 0.2-0.5m, and well spacing is 2-5m.
8. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 7, it is characterised in that described horizontal stroke
Well formula extraction well, open up on its well casing and some be respectively equipped with branch along the evenly spaced sieve aperture in well casing direction or screen slot, well casing both ends
Pipe, it is connected by branch pipe with extracting house steward, is filled with quartz sand between the lateral wall and soil of well casing, the groove above quartz sand
Interior filling bentonite.
9. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 8, it is characterised in that described horizontal stroke
Well formula extraction well, the ground of the contaminated site where it are provided with concrete layer, and the bottom surface of concrete layer is located at the extracting of horizontal well formula
On bentonite above well；Described concrete layer is divided into two layers up and down；Lower floor is cellular concrete；Upper strata is common coagulation
Soil.
10. it is used for the extracting gang of wells of contaminated site in-situ immobilization engineering as claimed in claim 9, it is characterised in that described
Concrete layer is setting the position of vertical shaft type extraction well to reserve corresponding hole, and service sleeve, vertical shaft are provided with described hole
Through described service sleeve and service sleeve after concrete curing, filling bentonite is sealed formula extraction well.
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| CN201710879454.4A CN107626730A (en) | 2017-09-26 | 2017-09-26 | A kind of extracting gang of wells for contaminated site in-situ immobilization engineering |
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| CN201710879454.4A CN107626730A (en) | 2017-09-26 | 2017-09-26 | A kind of extracting gang of wells for contaminated site in-situ immobilization engineering |
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Address after: 200001 floor 26, Gangtai Plaza, 700 Yan'an East Road, Huangpu District, Shanghai Applicant after: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L Address before: Room 1701, No. 688, Shuidian Road, Hongkou District, Shanghai 200083 Applicant before: SHANGHAI GREENMENT ENVIRONMENTAL TECHNOLOGIES CO. L |