CN207288344U - A kind of extracting gang of wells for contaminated site in-situ immobilization engineering - Google Patents

Abstract

The utility model discloses a kind of extracting gang of wells for contaminated site in-situ immobilization engineering, and comprising extracting manifold and some extracting well casings being respectively connected with extracting manifold, the other end for extracting manifold is equipped with vacuum 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 is separately mounted to pre-set by ground dry ground hole downwards in contaminated site；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.Extracting gang of wells provided by the utility model for contaminated site in-situ immobilization engineering, has outstanding advantages of soil gas can be trapped effectively, equipment is simple and safe, secondary pollution is controllable, repairing effect is good.

Description

A kind of extracting gang of wells for contaminated site in-situ immobilization engineering

Technical field

It the utility model is related to a kind of extraction device for contaminated site reparation, and in particular, to one kind is used to pollute The extracting gang of wells of place 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 fulfill 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, is mainly made 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, it passes through in the venue by electric energy, thermal 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 Recycled, 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 application 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 are condensed back to Receive it is less efficient, produce high humility exhaust gas is disposable, the complicated all difficulties such as more intractable of wastewater property.

Utility model content

The purpose of this utility model is to provide a kind of extraction device for contaminated site reparation, is repaiied using thermal desorption in situ Recovering technology, solves existing issue, effectively repairs the contaminated site of heavily contaminated, geology and complicated hydrogeological conditions.

In order to achieve the above object, the utility model provides a kind of extraction well for contaminated site in-situ immobilization engineering Group, wherein, the extracting gang of wells includes extracting manifold and some extracting well casings being respectively connected with extracting manifold, extracts manifold The other end be equipped with vacuum pump；The extracting well casing includes some vertical shaft type extraction wells being vertically mounted in contaminated site, 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 Vertical interlaced is distributed in in a piece of contaminated site and covering whole Polluted area.By vacuum pump, extracting well casing and extracting manifold Form vacuum extraction facility.

The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, the 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 than Polluted area bottom depth 0.3-0.5m.The bottom of well casing is equipped with bottom cover, bottom cover thickness about 30cm.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, vertical shaft type extraction well difference It is pre-set by if in ground dry ground hole downwards, well spacing is 1-3m in contaminated site；The 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, it is connected with manufacturing the hot-blast stove of hot wind, and the high-temperature hot-air that hot-blast stove produces passes through air-introduced machine 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 wind 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, the 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, the association extraction well, its hole diameter For 25-40cm；The top of the 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 manifold, 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 manifold 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 manifold 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, the independent extraction well, its hole diameter For 80-100cm, the independent extraction well is connected with extracting manifold, and valve is equipped between independent extraction well and extracting manifold.

The above-mentioned extracting gang of wells for contaminated site in-situ immobilization engineering, wherein, horizontal well formula extraction well difference It is arranged in some horizontal channels dug in Polluted area topsoil, the hole diameter of the horizontal well formula extraction well is 45- 55cm, is preferably 50cm, and 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, the horizontal well formula extraction well, its well Opened up on pipe it is some be respectively equipped with branch pipe along the evenly spaced sieve aperture in well casing direction or screen slot, well casing both ends, pass through branch pipe with take out Carry manifold to be connected, branch pipe is equipped 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, the horizontal well formula extraction well, its institute Contaminated site ground on be equipped with concrete layer, the bottom surface of concrete layer be located at bentonite above horizontal well formula extraction well it On；The 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, mix chemical admixture and mineral admixture, coordinate by proper proportion, by uniform stirring, closely knit shaping if necessary 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 mechanically fully foams, 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, the 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 equipped with the hole Filling is swollen through the steel service sleeve or iron hoop and steel service sleeve or iron hoop after concrete curing for well Profit soil is sealed.

Extracting gang of wells provided by the utility model for contaminated site in-situ immobilization engineering has the following advantages：

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 structure diagram of the extracting gang of wells for being used for contaminated site in-situ immobilization engineering of the utility model.

Fig. 2 is the structure diagram of the extracting well casing for being used for contaminated site in-situ immobilization engineering of the utility model.

Fig. 3 is the enlarged section of the horizontal well formula extraction well for contaminated site in-situ immobilization engineering of the utility model.

Fig. 4 is the section partial enlargement of the horizontal well formula extraction well for contaminated site in-situ immobilization engineering of the utility model Figure.

Embodiment

Specific embodiment of the present utility model is further described below in conjunction with attached drawing.

As shown in Figure 1, the extracting gang of wells provided by the utility model for contaminated site in-situ immobilization engineering, includes extracting Manifold 1 and some extracting well casings 2 being respectively connected with extracting manifold 1, the other end of extracting manifold 1 are equipped with vacuum pump 3；Extraction well Pipe 2 includes some vertical shaft type extraction wells 4 being vertically mounted in contaminated site, and is horizontally arranged at 5 topsoil of Polluted area Some horizontal well formula extraction wells 6 in earth.Vertical shaft type extraction well 4 and horizontal 6 vertical interlaced of well formula extraction well are distributed in a piece of pollution In place and cover whole Polluted area 5.Vacuum extraction facility is formed by vacuum pump 3, extracting well casing 2 and extracting manifold 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 5 bottom depth 0.3- of Polluted area 0.5m.The bottom of well casing is equipped with bottom cover 8, and bottom cover 8 thickness 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 is separately mounted to pre-set by ground dry ground hole downwards in contaminated site, 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 A heated well 11 is arranged in a native hole, its bottom exceeds 1m or so than the depth of 11 bottom of heated well；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 wind Wind furnace connects, and the high-temperature hot-air that hot-blast stove produces 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 wind 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 Equipped with the first valve 15, connection extracting manifold 1, another port of export is equipped 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 manifold 1, is closed The second valve 16 being connected with air or compressed air gas source；In the system operation middle and later periods, the between extracting manifold 1 is closed 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 manifold 1.Independent extraction well 10 The 3rd valve 17 is equipped between extracting manifold 1.

Horizontal well formula extraction well 6 is separately positioned in some horizontal channels 18 dug in 5 topsoil of Polluted area, horizontal well The hole diameter of formula extraction well 6 is 45-55cm, is 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 whole 5 surface of Polluted area.

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 manifold 1, branch pipe 19 is equipped 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.

The ground of contaminated site where horizontal well formula extraction well 6 is equipped 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, mix chemical admixture and mineral admixture, by appropriate if necessary 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 carries out cast-in-place construction by the pumping system of foaming machine or mould molding, the one kind formed through natural curing contains 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 equipped with hole 24, be 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.

The extracting gang of wells provided by the utility model for contaminated site in-situ immobilization engineering is done with reference to embodiment It is further described.

Embodiment 1

A kind of extracting gang of wells for contaminated site in-situ immobilization engineering, includes extracting manifold 1 and some and extracting manifold 1 The extracting well casing 2 being respectively connected with, the other end of extracting manifold 1 are equipped with vacuum pump 3.It is total by vacuum pump 3, extracting well casing 2 and extracting Pipe 1 forms vacuum extraction facility.

Vacuum extraction is realized by the vacuum pump 3 on ground and installation extracting well casing 2 in the venue, passes through vacuum pump 3 The negative pressure that operation produces is by the pollutant separated from soil media through extracting in the form of underground water or soil gas Well is drawn to ground by extracting manifold 1 and is handled.Vacuum extraction facility generally carries out the extracting fortune of underground water prior to heating OK, waste water treatment system is sent to handle after extracting 5 underground water of Polluted area out ground as much as possible, to save subsequent heat underground The energy of consumption needed for water, reduces 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 5 topsoil of Polluted area It is interior.

Vertical shaft type extraction well 4 is divided to two kinds of forms again, and a kind of is that the association being 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 4 well casing of vertical shaft type extraction well, is opened Hole span vertically covers whole Polluted area 5 and also goes out about 0.3-0.5m deeply than 5 bottom of Polluted area, should additionally add thickness The bottom cover 8 of about 30cm, bottom cover 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 manifold 1；The 3rd valve 17 is equipped between independent extraction well 10 and extracting manifold 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 equipped with the first valve 15, connection extracting manifold 1, the other end is equipped 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 " hot spot " The extracting of " cold spot " pollutant is collected.

In the system operation starting stage, pollutant concentration is higher in 11 Soil Surrounding of heated well, and the soil moisture is heating The effect of well 11 is lower to be risen quickly again, 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 manifold 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, 11 Soil Surrounding temperature of heated well 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.Need to close and extract the first valve 15 between manifold 1 at this time, 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 The vacuum suction effect of lower generation 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 11st 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, improves repairing effect.

Horizontal well formula extraction well 6 is separately positioned in some horizontal channels 18 dug in 5 topsoil of Polluted area, buried depth In 0.3-0.5m or so, hole diameter is generally in 50cm or so, and well spacing is generally in 2-5m, it is necessary to cover whole 5 surface of Polluted area. Sieve aperture or screen slot 7 are opened on well casing, well casing both ends are connected by branch pipe 19 with extracting manifold 1, are mainly used for 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 equipped 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.21 horizontal extent of earth's surface concrete layer can generally exceed each side 1-2m of restoring area, with mixing Solidifying soil 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 hot repair as far as possible and answer the upward heat loss of processing region；Upper strata normal concrete 23, thickness 10-20cm, primarily serves 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 since soil and pipe fitting thermal expansion cause concrete bodies to rupture in heating process, Influence sealing effect.

Embodiment 2

A kind of extracting gang of wells for contaminated site in-situ immobilization engineering, includes extracting manifold 1 and some and extracting manifold 1 The extracting well casing 2 being respectively connected with, the other end of extracting manifold 1 are equipped with vacuum pump 3.It is total by vacuum pump 3, extracting well casing 2 and extracting Pipe 1 forms vacuum extraction facility.Extracting well casing 2 is connected to extracting manifold 1 by heating resisting metal hose, and extracting manifold 1 is by certain Slope design.

The soil gas that in-situ heat restoring area produces 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 5 topsoil of region；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, 9 hole diameter of association extraction well again 25cm, is arranged in a native hole with heated well 11, and fitting depth is consistent, and top sets threeway 14, and both ends outlet is respectively provided with valve Door, one end are equipped with the first valve 15, connection extracting manifold 1, and the other end is equipped with the second valve 16, connects compressed air gas source；Solely 10 hole diameter 100cm of vertical extraction well, is arranged between heated well 11 (" cold spot " farthest apart from neighbouring heat 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 Well 9 and the distribution of independent extraction well 10 are set, and are extracted in the different phase adjusting 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 " hot spot " 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 11 Soil Surrounding of heated well 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 manifold 1, closes the second valve 16 being connected with compressed air gas source, is made by vacuum With the pollutant quickly discharged through association extraction well 9 in 11 neighboring area soil gas of heated well；Heating operation middle and later periods, heating 11 neighboring area soil of well has reached target temperature, between pollutant concentration is significantly reduced, it is necessary to close and extract manifold 1 First valve 15, interval open 16 injecting compressed air of the second valve 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 6 buried depth 0.2m of well formula extraction well, hole diameter 50cm, well spacing 2m are, it is necessary to cover whole 5 surface of Polluted area. Well casing both ends are connected by branch pipe 19 with extracting manifold 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 for 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 equipped 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, carries out the well casing installation of this mouthful of well immediately, and 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, reduces the water level of underground water.Precipitation depth is at least 1m below reparation depth；Reparation place equipped with independent extraction well 10, Independent extraction well 10 can be used early period in reparation as dewatering well.

After the completion of precipitation, arranged in gang of wells gap and excavate the horizontal type extraction well groove 18 of 100mm wide 200mm depths, groove The quartz sand 12 of 10cm thickness 2-5mm particle diameters is laid with 18, and installation horizontal type extracting well casing 2 is laid among layer of sand, and is filled The bentonite 13 of 10cm thickness carries out groove 18 and closes；The soil that the excavation of groove 18 produces, which is paved, is not excavating region.

After the installation for completing horizontal type extracting groove 18, restoring area is successively laid with the coagulation of two layers of each 20cm thickness in the original location Soil layer 21, wherein, made with the concrete layer 21 that soil to be repaired directly contacts of cellular concrete 22, complete maintenance It is laid with the normal concrete 23 of 20cm thickness on the top again afterwards；In the process of deployment of concrete layer 21, in vertical shaft type extraction well 4 The service sleeve 24 of pre-buried 50mm bigger than well casing diameter around well casing, is preferably steel service sleeve, 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.

Extracting gang of wells provided by the utility model for contaminated site in-situ immobilization engineering, belongs to combustion-type in-situ heat and takes off A necessaries in attached recovery technique.Combustion-type original position thermal desorption recovery technique is by difference by way of heat production of burning The chemical energy of fuel (oil gas, natural gas or diesel oil etc.) is converted to thermal energy, directly leads to using high-temp combustion flue gas as heat carrier The mode for crossing heat transfer conducts heat to underground via the heated well of contaminated site installation in situ, so as to improve place temperature simultaneously Realize the desorption of target contaminant and the purpose that extracting removes.There is combustion-type original position thermal desorption recovery technique the energy easily to obtain Take, system is safe and reliable, thermal desorption temperature is high, repairing effect is good, pollutant concentration such as does not rebound at the outstanding feature after reparation, application Have a extensive future.

Although the content of the utility model is discussed in detail by above preferred embodiment, but it should be appreciated that on The description stated is not considered as the limitation to the utility model.After those skilled in the art have read the above, for A variety of modifications and substitutions of the utility model all will be apparent.Therefore, the scope of protection of the utility model should be by appended Claim limit.

Claims (10)

1. a kind of extracting gang of wells for contaminated site in-situ immobilization engineering, it is characterised in that the extracting gang of wells, which includes, to be taken out Manifold and some extracting well casings being respectively connected with extracting manifold are carried, the other end for extracting manifold is equipped with vacuum pump；The pumping 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, opens 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 equipped with bottom cover 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 is separately mounted to pre-set by if in ground dry ground hole downwards, well spacing is 1-3m in contaminated site； The 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 the companion Raw extraction well, its hole diameter is 25-40cm；The top of the association extraction well is externally provided with a threeway on ground, and the two of threeway A port of export is respectively provided with valve, one of port of export connection extracting manifold, 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 the independent extraction well is connected with extracting manifold.

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 the horizontal stroke Well formula extraction well is separately positioned in some horizontal channels dug in Polluted area topsoil, the 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 the horizontal stroke Well formula extraction well, opens up on its well casing and some is respectively equipped with branch along the evenly spaced sieve aperture in well casing direction or screen slot, well casing both ends Pipe, is connected with extracting manifold by branch pipe, 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 the horizontal stroke Well formula extraction well, the ground of the contaminated site where it are equipped with concrete layer, and the bottom surface of concrete layer is located at the extracting of horizontal well formula On bentonite above well；The 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 equipped with the hole Through the service sleeve and service sleeve after concrete curing, filling bentonite is sealed formula extraction well.