CN106734153A - For thermal desorption processing system in situ and method that contaminated soil is carried out with heat exchange pattern - Google Patents
For thermal desorption processing system in situ and method that contaminated soil is carried out with heat exchange pattern Download PDFInfo
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- CN106734153A CN106734153A CN201710035073.8A CN201710035073A CN106734153A CN 106734153 A CN106734153 A CN 106734153A CN 201710035073 A CN201710035073 A CN 201710035073A CN 106734153 A CN106734153 A CN 106734153A
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- Prior art keywords
- well
- contaminated soil
- heat
- extraction
- heated
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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
-
- 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 discloses a kind of thermal desorption processing system in situ and method carried out with heat exchange pattern for contaminated soil, heated well, the extraction well of more than 1, the temperature monitoring well of more than 1 and the pressure monitoring well of more than 1 including located underground more than 1, exhaust treatment system and sewage disposal system of the extraction well connection positioned at ground, the surface in contaminated soil region is equipped with ground barrier layer, contaminated soil region is all around provided with water-stop curtain, and the depth of water-stop curtain is the impermeable stratum for reaching underground.The number of the heated well, extraction well, temperature monitoring well and pressure monitoring well meets 9：3：1：0.5, and the arrangement of the heated well, extraction well, temperature monitoring well, pressure monitoring well arranged using regular hexagon mode.The present invention can be prevented effectively from the diffusion of the Polluted area after thermal desorption in situ, the maintenance down probability caused by gas converting heat system jams when reducing system operation.
Description
Technical field
The present invention provides a kind of thermal desorption processing system in situ and method carried out with heat exchange pattern for contaminated soil,
Belong to technical field of soil remediation.
Background technology
Thermal desorption technology in situ is that contaminated soil is heated to more than the boiling point of target contaminant, by control system temperature
Selectively promote pollutant to gasify with residence time of material to volatilize, target contaminant separated with soil particle, removed.Heat is de-
Attached process can make the physicochemical changes such as organic compound volatilization and the cracking in soil.When pollutant be converted into gaseous state it
Afterwards, its mobility will be greatly improved, and the gaseous products for evaporating carry out purified treatment after collecting and capturing.
The object carried out handled by the system and method for thermal desorption in situ with heat exchange pattern is by volatile organic matter, half
Contaminated soil and the underground water such as volatile organic matter, agricultural chemicals type organic, polycyclic aromatic hydrocarbon type organic.That is, with heat
The system and method that conduction pattern carries out thermal desorption in situ are applied to all of organic contaminants soil and groundwater
Repair.
On May 28th, 2016, State Council prints and distributes《Soil Pollution Control action plan》, referred to as " ten, soil "." soil ten
Bar " Article 23 clear stipulaties：Improvement is carried out in former address in principle with recovery project, and is taken the necessary measures and prevented Polluted Soil
Earth is excavated, stored up etc. and causing secondary pollution.Therefore, for organic by volatile organic matter, semi-volatile organic matter, pesticide
The reparation of the contaminated soils such as thing, polycyclic aromatic hydrocarbon type organic and underground water, so thermal desorption technology application prospect right and wrong in situ
It is often extensive.
At present, the country is had some and the Patents of thermal desorption in situ is carried out with heat exchange pattern, but these patents are in itself
Focus on the thermal desorption process of particular technique, the pollutant for less being produced during attention thermal desorption is excessive and prevents cross pollution,
It is not thorough to be also contemplated in processing equipment setting.
The content of the invention
The purpose of the present invention is directed to by organic pollutant contaminated soil and underground water add with heat exchange pattern
Contaminated soil, is heated to temperature more than organic pollutant boiling point by thermal pollution soil, turns the phase of organic pollutant
It is changed into gaseous state, so as to reach the purpose of rehabilitating soil and underground water.Under the collective effect of ground barrier layer and air-introduced machine, make dirt
Dye soil region forms tiny structure, and gaseous organic pollutant is collected in extraction well, enters ground by high-temp waste gas extraction pipe
Face processing system is processed, waste gas qualified discharge after treatment, and sewage is processed into sewage disposal system.In order to ensure in-situ heat
Secondary pollution is not caused to environment in desorption process, it is heat rejection to form thermodynamic barrier in the surrounding in contaminated soil region and bottom；
In order to ensure being smoothed out for follow-up Ground Processing System, the present invention is provided with steam-water separation equipment also in Ground Processing System
It is standby.
The present invention provides a kind of thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil, including position
Heated well, the extraction well of more than 1, the temperature monitoring well of more than 1 and the prison of the pressure of more than 1 in more than 1 of underground
Well logging, positioned at the exhaust treatment system and sewage disposal system of ground, the surface in contaminated soil region spreads for the extraction well connection
It is provided with ground barrier layer, contaminated soil region is all around provided with water-stop curtain, and the depth of water-stop curtain is to reach underground not
Pervious bed.
The number of the heated well, extraction well, temperature monitoring well and pressure monitoring well meets 9：3：1：0.5, and it is described plus
Hot well, extraction well, temperature monitoring well, the arrangement of pressure monitoring well are arranged using regular hexagon mode.
Respectively positioned at six summits and center of regular hexagon, heated well constitutes the side of regular hexagon to the heated well
0.91 times of a length of heated well radius of influence, the summit of the extraction well and central point are located at the regular hexagon that heated well is constituted
The regular hexagon one that two corresponding point midways of the length of side, temperature monitoring well and pressure monitoring well location are constituted in heated well
The midpoint of the individual length of side and the point midway of the regular hexagon central point line.
The depth of the heated well and extraction well meets and penetrates whole contaminated soil region, and reach contaminated soil region with
The depth of lower 1-2m, to realize the underground heat rejection to contaminated soil region；The heated well is also about the contaminated soil area
The periphery in domain is set one week, to realize the surrounding heat rejection to contaminated soil region；The ground barrier layer is that thickness is 10-
The concrete layer of 30cm.
The exhaust treatment system includes the one-level steam-water separation equipment, gas converting heat system, the two grades of carbonated drinks that are sequentially connected with
Separation equipment, gas purifying equipment, air-introduced machine and chimney；The sewage disposal system includes the regulation tank, the sewage that are sequentially connected with
Heat-exchange system and sewage disposal device, one-level steam-water separation equipment, gas converting heat system, two grades of steam-water separation equipment and gas
Cleaning equipment is all connected with adjusting tank.
The extraction well is connected with the one-level steam-water separation equipment by waste gas extraction pipe, the extraction well with it is described
Connected by sewage pumping pipeline between regulation tank, the waste gas extraction pipe carries out being in tilted layout for 2%-5% or so, by extracting
Well is downward-sloping to one-level steam-water separation equipment direction.
The mode of heating of the heated well is that electrical heating produces heat, then heat radiation is carried out to the soil of surrounding and heat is passed
Lead, or the mode of heating of heated well is straight-through hot-air, then heat transfer is carried out to the soil of surrounding.
The depth of the heated well reaches the bottom clear area below contaminated soil region, and the heated well is intercepted in bottom surface
The lower section of layer carries out pouring sealing using cement grout, and heated well is along logical longitudinally to center setting heating element heater or hot-air
The periphery of road, the heating element heater or hot-air channel is heat conduction sand, and the outside of heat conduction sand is well casing.
The extraction well includes gas phase extraction well and multiphase extraction well, the depth of extraction well for reach contaminated soil region with
Under bottom clear area, the extraction well carries out pouring sealing, extraction well edge in the lower section of ground barrier layer using cement grout
And extracting screen casing is set longitudinally to center, the outside of the extracting screen casing sets quartz sand filtration layer, and extracting screen casing is exposed to ground
The over top in face is provided with vacuum table, and waste gas extraction pipe and sewage pumping pipeline are also associated with the top of extracting screen casing.
The present invention also provides a kind of in-situ heat desorption processing method carried out with heat exchange pattern for contaminated soil, including
Following steps：
1）Run the exhaust treatment system and sewage disposal system on ground；
2）Daily heating rate is 1 ~ 1.5 DEG C below 100 DEG C, and 100 DEG C increase temperature rise rate above according to temperature rise situation, use
Heated well continues to heat, and temperature in use monitoring well and pressure monitoring well are monitored；
3）When the gas flow of exhaust treatment system is reduced to the 20% of maximum throughput, and 1 ~ 5 day time is maintained, to pollution
Soil is sampled detection, if reaching reparation desired value, repairs and completes；If not up to, need other ancillary method with
Strengthening the effect of thermal desorption in situ or being changed to other techniques carries out subsequent treatment.
The step 2）In, if the boiling temperature of pollutant is less than 100 DEG C, it is necessary to contaminated soil is heated in contaminated soil
10 DEG C or so more than to pollutant boiling point, and keep heating, extract, monitor 30 ~ 90 days；If the boiling of pollutant in contaminated soil
Point temperature be higher than 100 DEG C, it is necessary to 10 DEG C or so that contaminated soil is heated to more than pollutant boiling point, and keep heating, extract,
Monitoring 3 ~ 20 days.
Compared to prior art, the advantage of the invention is that：
1. enable to the present invention to use in organic contaminants place carries out thermal desorption in situ with heat exchange pattern
Technique can be smoothed out；
2. the present invention can be prevented effectively from the Polluted area diffusion after thermal desorption treatment in situ；
3. present invention reduces the maintenance down probability caused by gas converting heat system jams during system operation；
4. the present invention carries out control and monitoring to in-situ heat desorption process, it is to avoid the unexpected generation during thermal desorption.
Brief description of the drawings
Fig. 1 is process chart of the invention；
Fig. 2 is the horizontal layout schematic diagram of contaminated site in the present invention；
Fig. 3 is the profile of heated well in the present invention；
Fig. 4 is the profile of longitudinal extraction well in the present invention；
Fig. 5 is the profile of horizontal extraction well in the present invention.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with
It is better understood from the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
The present invention provides a kind of thermal desorption processing system in situ and method carried out with heat exchange pattern for contaminated soil,
It is achieved through the following technical solutions：
As shown in figure 1, the thermal desorption processing system bag in situ carried out with heat exchange pattern for contaminated soil that the present invention is provided
Include heated well 1 located underground, extraction well 2, monitoring well 3（Including temperature monitoring well and pressure monitoring well）, and positioned on the ground
Exhaust treatment system, sewage disposal system, energy supply system 4（If being then supply of electric power system with electric power as power resources
System and power cable；If being then hot air generating system and hot-air supply line with hot-air as power resources；If with
Heat medium heat transfer is power resources, then be medium heating system and the heat medium circulatory system, for a whole set of processing system provides power,
Main connection heated well）With monitoring system 5（The operation of a whole set of processing system of monitoring, main connection temperature monitoring well and pressure prison
Well logging）.
Thermal desorption system in situ of the invention additionally uses contaminated soil region and intercepts measure and ground obstruct measure, wherein
The floor surface that ground obstruct measure is specially in contaminated soil region lays ground barrier layer 6, and thickness is not limited, complete nothing
The damaged obstruct for realizing floor surface, specifically can preferably lay with 10-30cm thick heat resistance concrete layer or gas
Bubble light insulating concrete layer is realized intercepting, and forms heat rejection barrier with the floor surface in contaminated soil region, and prevent heat
Amount loss is excessive with pollutant.The obstruct measure of contaminated soil region is specially four below contaminated soil region and in addition
Zhou Jinhang heat rejections, to be specifically as follows be set to the depth of heated well and extraction well and reach the cleaning below contaminated soil region
Region（It is specifically as follows and digs the depth that depth reaches 1-2m below contaminated soil region）, with the following shape in contaminated soil region
Into Base Heat baffle area 7, and the circle of interval setting one heated well in the clean soil of the periphery in contaminated soil region is close to, should
Need to be spaced the 1-2 distance of heat transfer radius between one circle heated well of periphery setting and contaminated soil region, a circle adds
The clean soil region that hot well is heated forms surrounding thermal resistance septal area 8, is realized to the four of contaminated soil region by above means
Heat rejection is realized in week and bottom, prevents pollutant excessive.
The present invention can also set one and enclose in the spacing of the outer weekly interval 1.5-3m of the heated well of contaminated soil region periphery
Water-stop curtain 9, the depth of water-stop curtain can reach underground impermeable stratum 10, make impermeable stratum 10 and the sealing curtain for all around setting
Curtain 9 is engaged, to intercept the flowing of underground water.
The heated well located underground, extraction well, temperature monitoring well, the arrangement of pressure monitoring well use positive six
Side shape arrangement, as shown in Fig. 2 wherein heated well is arranged at six summits and the central point of regular hexagon, and heated well is constituted
The length of side of regular hexagon be 0.8-0.91 times of the heated well radius of influence.The summit of the extraction well and central point are located at heating
Two corresponding point midways of the length of side of regular hexagon that well is constituted, and then make the regular hexagon that extraction well also constituted
It is larger compared with heated well.Temperature monitoring well and pressure monitoring well location are in one length of side of the regular hexagon that heated well is constituted
Point and the point midway of the regular hexagon central point line, the regular hexagon that temperature monitoring well and pressure monitoring well are constituted will be compared with
The regular hexagon that extraction well is constituted is some larger, and the number between heated well, extraction well, temperature monitoring well and pressure monitoring well
Amount ratio meets heated well：Extraction well：Temperature monitoring well：Pressure monitoring well=9：3：1：0.5, number and setting according to more than
Position rule can set each well body in specific contaminated site.The pressure monitoring well is arranged at dirt mostly in arrangement
Contaminate the surrounding of soil region, small part is uniformly arranged in contaminated soil region, in specific setting, due to temperature monitoring well and
The set location of pressure monitoring well is identical rule, therefore, can be flexible in the case where the two number proportionate relationship is met
Arrangement.Above heated well, extraction well, temperature monitoring well, the arrangement of pressure monitoring well than more uniform, be prevented from heating,
In extractive process produce dead angle problem occur, make heating, extracting more fully, and can be relatively good realize pressure and temperature
Monitoring.
The mode of heating of the heated well is to be provided with electrically heated rod in electrical heating, i.e. heated well, then to the soil of surrounding
Carry out heat radiation and heat transfer.The mode of heating of the heated well can also be hot-air, and the source of hot-air is fuel combustion
The hot-air or other manner of generation are by changing thermogenetic hot-air.The mode of heating of the heated well can also be heat medium
Heat transfer, i.e., the pipeline by medium heating system and medium in heated well is transferred heat in contaminated soil.
The heated well cross-section structure is as shown in figure 3, it is downward from the surface of ground 24 in pending contaminated soil region
Dig, bottom clear area 27 is reached up through contaminated soil region 28, specific depth is to reach contaminated soil region below 28
The depth of 1-2m, the cleaning soil depth of the 1-2m just constitutes Base Heat baffle area 7.The top in the contaminated soil region 28
The ground barrier layer 6 that is constituted for the refractory concrete layer of 10-30cm of the thickness that is equipped with of the surface of ground 24, the heating
Well carries out sealing and constitutes cement grout portion 25 in the lower section of ground barrier layer 6 using cement grout.Heated well 1 is along longitudinal center
Place sets heating element heater, hot-air channel or heat medium passage 29, the heating element heater, hot-air channel or heat medium passage 29
Periphery is heat conduction sand 26, and the outside of heat conduction sand is the well casing of metal material, is used to support whole well body internal heating element, heat empty
Gas passage or heat medium passage 29, heat conduction sand 26, and outwards conduct heat.The thickness of the heat conduction sand 26（Radially）For 75 ~
100mm, heat is conducted for the heat produced after absorbing heating element heater or hot-air exchange and to surrounding soil.
The extraction well includes gas phase extraction well and multiphase extraction well, when the Groundwater in contaminated soil region to be repaired
When position is less than restoring area, extraction well uses gas phase extraction well；When the groundwater level in contaminated soil region to be repaired is located at
When in restoring area, extraction well using the extracting of dewatering well and gas phase be combined into together with the multiphase extraction well that is formed.
As shown in Figure 4 and Figure 5, when contaminated soil region 28, depth is not blocked up for the cross-section structure of the extraction well, such as 10m with
It is interior, generally using longitudinal extraction well, as shown in figure 4, it is downward from the surface of ground 24 in pending contaminated soil region 28
Dig, until reaching bottom clear area 27, specific depth is the depth for reaching contaminated soil region 1-2m below 28, the 1-2m's
Cleaning soil depth constitutes Base Heat baffle area 7.The thickness that the surface of ground 24 in the contaminated soil region 28 is equipped with
It is the ground barrier layer 6 that the refractory concrete layer of 10-30cm is constituted, the extraction well is used in the lower section of ground barrier layer 6
Cement grout carries out sealing and constitutes cement grout portion 25.Internal longitudinally central place sets extracting screen casing 30, the extracting screen casing 30
It is outside quartz sand filtration layer 31 is set, do not enter extracting screen casing 30 to ensure silt during extracting, prevent subsequently
Face processing system（Exhaust treatment system and sewage disposal system）Block.The over top that extracting screen casing 30 is exposed to ground is set
There is vacuum table 32, to show the negative pressure value in extraction well at any time.The top for extracting screen casing 30 is also connected with the waste gas of outside setting
Extraction pipe 18 and sewage pumping pipeline 19, the waste gas extraction pipe 18, sewage pumping pipeline 19 are extracted with extraction well 2 respectively
The pump-line of setting, pumping conduit are connected in screen casing 30.
The automatic Underground water water level of energy is provided with the bottom of multiphase extraction well and according to groundwater level automatic start-stop
The water pump with compressed air as power, and by extract extracting screen casing in pumping conduit connect sewage pumping pipeline, and then
It is connected with the sewage disposal system of ground.
If relatively deep such as more than the 10m in contaminated soil region to be repaired, then need the scattered level for setting more than 1 to extract
Well, extraction pipe uses carbon steel pipe, structure as shown in figure 5, the depth that the depth of horizontal extraction well is horizontal extraction pipe 32 is
In ground barrier layer 1 meter -3 meters or so of position below 6（In contaminated soil region 28）, and horizontal extraction well well head
Part needs to be sealed using cement grout in the bottom of bottom surface barrier layer.The reason for using horizontal extraction well is that vapor is adding
Ramped up after heat and risen, be pooled to the lower section of ground barrier layer, to prevent in ground barrier layer higher-pressure region formed below.Level is extracted
Well set its do not calculate in being described above 9：3：1：In 0.5 number design, it belongs to additional technology segment, in dirt
Setting horizontal extraction well in the case of dye soil region relatively depth can preferably realize extracting.
Multiple thermocouples are provided with described temperature monitoring well, 1 thermocouple typically is set every 1.5 meters；Temperature monitoring
The depth of well needs to reach the bottom in contaminated soil region, that is, reach and touch and be more than Base Heat baffle area, temperature prison
In sieve aperture is provided with longitudinal well casing of below ground in well logging, it digs downwards from pending contaminated soil region surface, and
The ground that the thickness being equipped with the surface at the top of well, contaminated soil region is constituted for the refractory concrete layer of 10-30cm
Face barrier layer, and use the side of cement seal, the part more than ground to pass through metal hose under the barrier layer of ground
It is connected to be connected exhaust treatment system with the waste gas extraction pipe on ground, and prevents high-temp waste gas the four of the temperature monitoring well borehole wall
Week forms higher-pressure region and temperature short-channel, it is ensured that system operatio safety.
Described pressure monitoring well is located at contaminated soil region neighboring mostly, uniformly divides in contaminated soil region on a small quantity
Cloth.1 pressure probe is provided with described temperature and pressure power monitoring well, set location is the depth of the 0-3m below the barrier layer of ground
Degree, shows to judge whether restoring area runs under negative pressure, if can cause two to environment by pressure monitoring well internal pressure
Secondary pollution；Shown by the pressure of place surrounding and judge whether Polluted area spreads, and pass through the pressure monitoring in contaminated site
Well pressure display judges whether ground barrier layer has infringement.Pressure monitoring well uses cement under the ground barrier layer at the top of it
Pour sealing.
As shown in figure 1, described exhaust treatment system includes the one-level steam-water separation equipment 11, gas converting heat being sequentially connected with
System 12, two grades of steam-water separation equipment 13, gas purifying equipment 14, air-introduced machine 15 and chimneys 16, through chimney 16 to qualified discharge
17, the extraction well 2 is connected with the one-level steam-water separation equipment 11 by waste gas extraction pipe 18.When considering that sharp to waste heat
With waste gas extraction pipe 18 and one-level steam-water separation equipment 11 need to carry out isothermal holding, if not considering UTILIZATION OF VESIDUAL HEAT IN, waste gas is taken out
Carry pipeline 18 and one-level steam-water separation equipment 11 need not carry out isothermal holding, and in setting waste gas extraction pipe 18 need into
Row 2%-5%'s or so is in tilted layout, downward-sloping to 11 directions of one-level steam-water separation equipment from extraction well, is beneficial to waste gas extracting
Condensate liquid in pipeline 18 is to the water conservancy diversion of one-level steam-water separation equipment 11.The bottom of one-level steam-water separation equipment 11 offers pipeline,
It is connected with the regulation tank 20 of sewage disposal system, is discharged from one-level steam-water separation equipment 11 at any time in order to condensate liquid.By one
The high-temp waste gas of level steam-water separation equipment 11 by temperature after the heat exchange of gas converting heat system close to normal temperature, afterwards again by two grades of vapour
Water separation equipment 13, by after gas purifying equipment purification and in air-introduced machine 15（Roots blower）Draft effect under, through chimney
16 qualified discharges.The bottom outlet of sewer and gas of the condensation-water drain of gas converting heat system 12, two grades of steam-water separation equipment 13
The outlet of sewer of body cleaning equipment 14 is connected with the regulation tank 20 of sewage disposal system.
In to contaminated soil heating process, indigenous microorganism can be with the increased activity of temperature in the range of 10 ~ 45 DEG C
Enhancing, ethnic quantity increases.The accumulation under roots blower air-extraction function of these indigenous microorganisms is arrived in gas converting heat system and blocked
Gas converting heat system, gas converting heat system can just be continued to run with after block clearing must be shut down when clogging is serious.Changed in gas
Steam-water separation equipment is set before hot systems, most indigenous microorganism is entered into sewage disposal system with condensed water, subtract
The probability of small gas heat-exchange system blocking accident.
As shown in figure 1, the sewage disposal system includes being sequentially connected with regulation tank 20, liquid heat exchange system 21 and sewage
Reason equipment 22.Connected by sewage pumping pipeline 19 between the sewage disposal system and extraction well 2（Correspondence carries out multiphase extracting
Or be required to be equipped with this equipment during groundwater extraction）.Inflow sewage after being processed through sewage disposal device 22 is received and is managed or up to standard
Discharge 23.
The desorption processing method of the thermal desorption system in situ heated with heat exchange pattern specifically includes following step
Suddenly：
1）The exhaust treatment system and sewage disposal system on ground are run first；
2）Daily heating rate is 1 ~ 1.5 DEG C below 100 DEG C, and 100 DEG C can suitably increase temperature rise speed above according to temperature rise situation
Rate, such as heating rate are 2-3 DEG C, and while being begun to warm up using heated well at the beginning, extraction well is to proceed by extracting, and
Temperature in use monitoring well and pressure monitoring well are monitored；
If the boiling temperature of pollutant is less than 100 DEG C, it is necessary to contaminated soil is heated to more than pollutant boiling point in contaminated soil
10 DEG C or so, and keep heating, extract, monitor 30 ~ 90 days（Depending on number of days is according to pollutant concentration and reparation desired value）；If
The boiling temperature of pollutant is higher than 100 DEG C, it is necessary to 10 DEG C for contaminated soil being heated to more than pollutant boiling point in contaminated soil
Left and right, and keep heating, extract, monitor 3 ~ 20 days（Depending on number of days is according to pollutant concentration and reparation desired value）；
3）When the gas flow of exhaust treatment system is reduced to the 20% of maximum throughput and maintain 1 ~ 5 day time, to ensure dirt
Dye thing is thoroughly taken out.Detection is sampled to contaminated soil, if reaching reparation desired value, that is, is considered as reparation and is completed；If not reaching
Arrive, then needing other ancillary method strengthening the effect of thermal desorption in situ or be changed to other techniques carries out subsequent treatment,
For example can be with return to step 2）Process proceed heating extracting or can be using being repaired by the way of in situ injection.It is dirty
Directly by extracting the automatic control of pump, and with intensification, sewage extracting amount meeting nature is gradually reduced for the judgement up to standard of water treatment system,
Finally it is reduced to zero.
Embodiment described above is only the preferred embodiment lifted to absolutely prove the present invention, protection model of the invention
Enclose not limited to this.Equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (10)
1. a kind of thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil, it is characterised in that including position
Heated well, the extraction well of more than 1, the temperature monitoring well of more than 1 and the prison of the pressure of more than 1 in more than 1 of underground
Well logging, positioned at the exhaust treatment system and sewage disposal system of ground, the surface in contaminated soil region spreads for the extraction well connection
It is provided with ground barrier layer, contaminated soil region is all around provided with water-stop curtain, and the depth of water-stop curtain is to reach underground not
Pervious bed.
2. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 1, its
It is characterised by, the number of the heated well, extraction well, temperature monitoring well and pressure monitoring well meets 9：3：1：0.5, and it is described plus
Hot well, extraction well, temperature monitoring well, the arrangement of pressure monitoring well are arranged using regular hexagon mode.
3. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 2, its
It is characterised by, respectively positioned at six summits and center of regular hexagon, heated well constitutes regular hexagon to the heated well
The length of side is 0.91 times of the heated well radius of influence, and the summit of the extraction well and central point are located at positive six side that heated well is constituted
Two corresponding point midways of the length of side of shape, the regular hexagon that temperature monitoring well and pressure monitoring well location are constituted in heated well
One midpoint of the length of side and the point midway of the regular hexagon central point line.
4. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 1, its
It is characterised by, the depth satisfaction of the heated well and extraction well penetrates whole contaminated soil region, and reaches contaminated soil region
The depth of following 1-2m, to realize the underground heat rejection to contaminated soil region；The heated well is also about the contaminated soil
The periphery in region is set one week, to realize the surrounding heat rejection to contaminated soil region；The ground barrier layer is that thickness is 10-
The concrete layer of 30cm.
5. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 1, its
It is characterised by, the exhaust treatment system includes the one-level steam-water separation equipment, gas converting heat system, the two grades of carbonated drinks that are sequentially connected with
Separation equipment, gas purifying equipment, air-introduced machine and chimney；The sewage disposal system includes the regulation tank, the sewage that are sequentially connected with
Heat-exchange system and sewage disposal device, one-level steam-water separation equipment, gas converting heat system, two grades of steam-water separation equipment and gas
Cleaning equipment is all connected with adjusting tank.
6. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 5, its
It is characterised by, the extraction well is connected with the one-level steam-water separation equipment by waste gas extraction pipe, the extraction well and institute
State regulation tank between connected by sewage pumping pipeline, the waste gas extraction pipe carries out being in tilted layout for 2%-5% or so, by taking out
Carry well downward-sloping to one-level steam-water separation equipment direction.
7. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 1, its
It is characterised by, the mode of heating of the heated well produces heat for electrical heating, then heat radiation is carried out to the soil of surrounding and heat is passed
Lead, or the mode of heating of heated well is straight-through hot-air, then heat transfer is carried out to the soil of surrounding.
8. the thermal desorption processing system in situ carried out with heat exchange pattern for contaminated soil according to claim 1, its
It is characterised by, the depth of the heated well reaches the bottom clear area below contaminated soil region, the heated well hinders in bottom surface
The lower section of interlayer carries out pouring sealing using cement grout, and heated well sets heating element heater or hot-air along longitudinally to center
The periphery of passage, the heating element heater or hot-air channel is heat conduction sand, and the outside of heat conduction sand is well casing；The extraction well includes gas
Phase extraction well and multiphase extraction well, the depth of extraction well are to reach the bottom clear area below contaminated soil region, the extracting
Well carries out pouring sealing in the lower section of ground barrier layer using cement grout, and extraction well sets extracting sieve along longitudinally to center
Pipe, the outside of the extracting screen casing sets quartz sand filtration layer, and the over top that extracting screen casing is exposed to ground is provided with vacuum table,
Waste gas extraction pipe and sewage pumping pipeline are also associated with the top of extracting screen casing.
9. a kind of in-situ heat desorption processing method carried out with heat exchange pattern for contaminated soil, it is characterised in that including with
Under several steps：
1）Run the exhaust treatment system and sewage disposal system on ground；
2）Daily heating rate is 1 ~ 1.5 DEG C below 100 DEG C, and 100 DEG C increase temperature rise rate above according to temperature rise situation, use
Heated well continues to heat, and temperature in use monitoring well and pressure monitoring well are monitored；
3）When the gas flow of exhaust treatment system is reduced to the 20% of maximum throughput, and 1 ~ 5 day time is maintained, to pollution
Soil is sampled detection, if reaching reparation desired value, repairs and completes；If not up to, need other ancillary method with
Strengthening the effect of thermal desorption in situ or being changed to other techniques carries out subsequent treatment.
10. the in-situ heat desorption processing method carried out with heat exchange pattern for contaminated soil according to claim 9, its
It is characterised by, the step 2）In, if the boiling temperature of pollutant is less than 100 DEG C, it is necessary to contaminated soil is added in contaminated soil
More than heat to pollutant boiling point 10 DEG C or so, and keep heating, extract, monitor 30 ~ 90 days；If pollutant in contaminated soil
Boiling temperature be higher than 100 DEG C, it is necessary to 10 DEG C or so that contaminated soil is heated to more than pollutant boiling point, and keep heating, take out
Carry, monitor 3 ~ 20 days.
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| CN109013685A (en) * | 2018-07-06 | 2018-12-18 | 北京石油化工学院 | A kind of hydrocarbon contamination soil repair system based on thermal desorption in situ |
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