CN112916598B - Organic contaminated soil vapor extraction equipment - Google Patents
Organic contaminated soil vapor extraction equipment Download PDFInfo
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- CN112916598B CN112916598B CN202110217773.5A CN202110217773A CN112916598B CN 112916598 B CN112916598 B CN 112916598B CN 202110217773 A CN202110217773 A CN 202110217773A CN 112916598 B CN112916598 B CN 112916598B
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- 239000012808 vapor phase Substances 0.000 claims abstract description 11
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- 238000001179 sorption measurement Methods 0.000 claims description 24
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 238000005067 remediation Methods 0.000 abstract description 11
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- 229920006395 saturated elastomer Polymers 0.000 abstract description 5
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- 239000003344 environmental pollutant Substances 0.000 description 18
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- 206010042602 Supraventricular extrasystoles Diseases 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 5
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to organic contaminated soil vapor phase extraction equipment which comprises a tail gas discharge pipeline, a vacuum blower communicated with the tail gas discharge pipeline, an exhaust pipe communicated with a suction port of the vacuum blower, a ventilation shaft sleeved on the outer circumference of the exhaust pipe and a spraying and sucking device for absorbing gas and liquid and spraying gas, wherein the exhaust pipe is communicated with the suction port of the vacuum blower; and the tail gas treatment device is communicated with the tail gas discharge pipeline. The driving device in the vapor extraction equipment drives the spraying and sucking device to firstly pump out water molecules and polluted air in soil in a saturated region, then fresh air with certain pressure is sprayed to the polluted soil in the saturated region, and organic pollutants volatilized and desorbed are brought to the unsaturated region, so that the organic pollutants in the soil with high concentration and low volatility can be taken out and removed in a large area, and the soil remediation efficiency is improved.
Description
Technical Field
The invention relates to the field of soil remediation, in particular to organic contaminated soil vapor extraction equipment.
Background
With the rapid development of economic society, the demand of petroleum and its products is increasing, and the petroleum-contaminated soil is increasing due to a plurality of reasons, which has become a major environmental problem to be solved urgently. Investigation revealed that some of the oil field areas were heavily contaminated with oil, with the oil content well above the critical value (500mg/kg) in the vast majority of soil samples collected within 100m around the well. The polluted soil is divided into ectopic remediation and in-situ remediation. The former is simple and easy to dig out the polluted soil and then carry out subsequent treatment, but is easy to cause secondary pollution, the repair cost is higher, the method is generally suitable for repairing small-scale or heavily polluted soil, and the latter is most commonly used in the gas-phase extraction (SVE) technology, and is one of the research hotspots of the petroleum organic polluted soil repair technology due to the characteristics of simple equipment, flexible operation, higher purification efficiency, small harm to the surrounding environment, low treatment cost and the like.
In the current soil remediation technology, the soil vapor extraction is the most intimate soil remediation technology combining modern high technology, can be used for soil remediation, can also be used in the fields of groundwater remediation and the like, and can efficiently remove volatile organic compounds such as heavy oil, light oil and the like in soil. Through a special bottom extraction well system, gas in soil in a non-saturated area is forced to flow by utilizing pressure generated by extracting vacuum or injecting air, fresh air is injected into a polluted area through an injection well, and volatile organic pollutants in soil pores are desorbed and taken away from the soil by utilizing negative pressure generated by a vacuum pump when the air flows through the polluted area, and the pollutants are purified by subsequent treatment.
In soil remediation projects of the last decade it has been found that the proportion distribution of pollutant species is mainly organic pollutants and heavy metals. The proportion of the composite pollution existing in the two areas is close to 30%, which shows that the repair difficulty is increased and the cost is high when various pollutants of different types exist in the same field. The method mainly aims at industrial waste places and oil fields, and covers the industries of chemical industry, petrifaction, electric power, coking, pharmacy, electroplating, steel, nonferrous metals and the like. The transport of contaminants is mainly due to pressure induced convection and diffusion in the gas phase.
The typical soil in the North China is taken as an experimental soil sample, and the influence of the flow velocity of pumping gas, the water content of the soil and the soil quality on the decontamination process of oil pollutants is researched through a one-dimensional soil column experiment. The research on the influence of gas-liquid (water) mass transfer and liquid (water) -solid mass transfer coefficients is realized in an actual simulation experiment, and the simulation experiment shows that: the experimental results can be well described by the phase equilibrium model at the initial stage of ventilation, the compressed fluid dynamics can be applied to the experiment of the soil vapor extraction technology by using the ventilation technology, and the influence of the interaction among physical, chemical and biological processes on the increase of the pollutant removal efficiency is explored. The current experimental result shows that the factors influencing the extraction efficiency include the soil air permeability, the soil water content, the air extraction rate, the organic matter saturation and vapor pressure and the environmental temperature which all influence the efficiency of extracting the mixed pollutants. In the prior art, environmental temperature is improved, an in-situ thermal remediation technology is utilized in a plurality of patents in China, but a heating technology has a remarkable effect of reducing the TPH concentration of an aeration zone, but chemical substances such as benzene in soil, crude oil in an oil storage tank and the like still cannot be resolved and separated depending on the temperature rise, and the problem of influence of industrial waste discharge on the soil needs to be solved at present, so that the application range of a soil extraction technology needs to be further expanded and perfected.
Disclosure of Invention
The invention aims to provide organic contaminated soil vapor phase extraction equipment which can achieve air injection to promote volatilization of organic contaminants in mixed soil containing various organic contaminants in volatile or semi-volatile soil in various ways, so as to solve the problem that various mixed organic contaminants are not easy to suck in the background art;
in order to achieve the purpose, the technical scheme provided by the invention is as follows: a kind of organic contaminated soil vapor phase extraction apparatus, including the exhaust emission pipeline, vacuum blower communicated with said exhaust emission pipeline, the exhaust tube communicated with suction inlet of said vacuum blower, the air shaft that is fitted over the outer circumference of said exhaust tube and absorbs the gas-liquid and gushes out the suction unit of the gas;
the spraying and sucking device comprises a spraying machine head arranged in the ventilation well and a driving device for driving the spraying machine head to rotate;
the injector head is arranged in the ventilation well;
the driving device is arranged at the upper part of the exhaust pipe;
and the tail gas treatment device is communicated with the tail gas discharge pipeline.
Further:
the inner wall of the ventilation shaft is provided with a left spiral groove extending along the axial direction of the ventilation shaft and a right spiral groove communicated with the tail end of the left spiral groove in a crossed manner;
the tail end of the right spiral groove is in cross communication with the starting end of the left spiral groove;
the injection machine head spirally rotates along the left spiral groove and the right spiral groove.
Further:
the driving device comprises a motor, a transmission shaft fixedly connected to an output shaft of the motor, a driving gear fixedly connected to the transmission shaft, a driven gear meshed with the driving gear and a shifting shaft fixedly and uniformly distributed on the lower end face of the driven gear;
the number of the shifting shafts is more than two;
the driving device also comprises a sliding disc sleeved on the more than two shifting shafts;
the injection machine head is arranged at the lower end of the sliding disc;
the driven gear is fixedly connected to the air exhaust pipe;
the sliding disc rotates along the axis of the exhaust tube.
Further:
a linear bearing is arranged between the sliding disc and the exhaust tube;
an oilless bearing is arranged between the sliding disc and the shifting shaft.
Further:
the spraying machine head comprises a cross-shaped coupling, one end of the cross-shaped coupling is connected to the lower end face of the sliding disc, a spraying and sucking conduit and a spraying and sucking nozzle, wherein the spraying and sucking conduit is connected to the other end of the cross-shaped coupling, and the spraying and sucking nozzle is fixedly connected to the lower end of the spraying and sucking conduit;
the section of the spray suction nozzle is in a regular trapezoid shape;
the spray nozzle is matched with the left spiral groove and the right spiral groove.
Further:
the spraying and sucking conduit comprises a central conduit and a sucking conduit sleeved on the outer circumference of the central conduit;
the spraying and sucking nozzle comprises a spraying cavity, an adsorption cavity surrounding the spraying cavity, an adsorption wall arranged on the outer circumference of the adsorption cavity and a spraying head connected to the lower end of the spraying cavity;
the spraying and sucking device also comprises a first bracket fixedly connected to one end of the cross-shaped coupler, a second bracket fixedly connected to the other end of the cross-shaped coupler, a connector arranged on the spraying and sucking guide pipe, a gas spraying pipe with one end communicated with the connector and a spraying blower communicated with the other end of the gas spraying pipe;
the gas ejector pipe is communicated with the central guide pipe;
the gas injection pipe penetrates through the sliding disc, the first support and the second support;
the adsorption wall is provided with adsorption holes which are uniformly distributed;
the lower end of the air suction conduit is communicated with the adsorption cavity;
the upper end of the air suction duct is communicated with the vacuum blower.
Further:
the spray nozzle also comprises a one-way valve arranged in the spray head;
the one-way valve is in a communication state from top to bottom.
Further:
a filter belt is arranged on the inner wall of the left spiral groove;
and a filter belt is arranged on the inner wall of the right spiral groove.
Further:
the pipeline of the vacuum blower communicated with the exhaust pipe also comprises an on-off device;
the on-off device comprises an on-off cylinder, an on-off sliding plate fixedly connected to a piston rod of the on-off cylinder and an on-off sliding seat in sliding connection with the on-off sliding plate;
an on-off sliding plate hole is formed in the on-off sliding plate;
the number of the on-off slide plate holes is one;
the on-off sliding seat is provided with an on-off sliding seat hole;
the axis of the on-off sliding plate hole and the axis of the on-off sliding seat hole are on the same vertical line;
the number of the on-off sliding seat holes is one.
Further:
the vacuum blower comprises a left suction opening A and a right suction opening B;
the on-off device also comprises a transposition air cylinder, a transposition sliding plate fixedly connected to a piston rod of the transposition air cylinder and a transposition sliding seat in sliding connection with the transposition sliding plate;
the transposition sliding seat is fixedly connected to the suction port installation side of the vacuum blower;
a first transposition sliding seat hole and a second transposition sliding seat hole are formed in the transposition sliding seat;
the axis of the first transposition sliding seat hole and the axis of the second transposition sliding seat hole are on the same horizontal line;
the first transposition sliding seat hole and the left suction port A are coaxial, and the second transposition sliding seat hole and the right suction port B are coaxial;
more than one transposition slide plate hole is formed in the transposition slide plate;
the transposition sliding seat and the on-off sliding seat are arranged in a crossed manner;
the on-off sliding seat is fixedly connected with the transposition sliding plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the driving device in the vapor extraction equipment drives the spraying and sucking device to firstly pump out water molecules and polluted air in soil in a saturated region, then fresh air with certain pressure is sprayed to the polluted soil in the saturated region, and organic pollutants volatilized and desorbed are brought to the unsaturated region, so that the organic pollutants in the soil with high concentration and low volatility can be taken out and removed in a large area, and the soil remediation efficiency is improved.
2. The spraying and sucking device in the vapor extraction equipment rotates in the ventilation shaft in a spiral mode, no matter the spraying and sucking device sucks air or sprays clean air, the walking track of the spraying and sucking device is in circular spiral motion along the ventilation shaft, soil acted by the spraying and sucking device also takes the ventilation shaft as a circle center to generate an adsorption radius as a soil repairing range, the repairing range is determined and effectively planned, the polluted soil can be completely covered during repairing the soil, the repeated action is not needed, the time can be fully utilized, and the efficiency is improved.
3. The driving device in the vapor extraction equipment adopts a gear transmission structure driven by a motor, and has strong transmission power, so that the movement torque of the spray suction device is strong; and due to the action of the cross-shaped coupling, the spraying nozzle contains centrifugal force, and the adsorption and spraying ranges of the spraying nozzle are greatly enlarged.
4. The on-off device in the vapor extraction equipment adopts different working modes of the vacuum blower controlled by a mechanical structure, so that the equipment resources are reasonably utilized and unnecessary energy consumption is avoided in order to meet the general design concept of different pollution degrees and different pollutant requirements in different regions.
5. The gas phase extraction equipment is completely operated in a non-manual mode, manual input is avoided, manpower is saved, the structure is simple, transportation is convenient, faults are not easy to generate, and enterprise cost is reduced.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a right side view schematic of the present invention;
FIG. 3 is a schematic structural diagram of a driving device of the present invention;
FIG. 4 is a schematic diagram of the structure of the injector head of the present invention;
FIG. 5 is a schematic view of the structure of the nozzle and the nozzle of the present invention;
FIG. 6 is a schematic view of the on/off device of the present invention;
fig. 7 is a left-side view schematic structural view of the on-off device of the present invention.
Wherein, 1, a tail gas discharge pipeline; 2, an exhaust pipe; 3, a spraying and sucking device; 31 a drive device; 311 a sliding disk; 312 driven gear; 313 a drive gear; 314 a drive shaft; 315 a motor; 316 a shifting shaft; 317 an oilless bearing; 318 linear bearings; 32 a jet head; 321 a cross coupling; 322 a spray-suction conduit; 3221 a central catheter; 3222 an inspiratory conduit; 3233 spray head; 3234 an adsorption wall; 3235 a filter belt; 3236 adsorption wells; 3237 a one-way valve; 323 a spray nozzle; 33 a jet blower; 34 a joint; 35 a first bracket; 36 a second bracket; 37 a gas ejector tube; 4, ventilating shafts; 41A left spiral groove; 41B right spiral groove; 5 a tail gas treatment device; a vacuum blower 6; 7 an on-off device; 71 switching on and off the air cylinder; 72 switching the sliding plate; 721 sliding plate holes are opened and closed; 722 make-break sliding seat holes; 73 switching on and off the slider; 74 a transposition air cylinder; 75, a transposition sliding plate; 76 index slide.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
It is to be understood that the terms "height," "width," "upper," "lower," "left," "right," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be considered as illustrative of the present invention.
Example 1
As shown in fig. 1-7, a vapor phase extraction device for organic contaminated soil comprises a tail gas discharge pipeline 1, a vacuum blower 6 communicated with the tail gas discharge pipeline 1, an exhaust pipe 2 communicated with a suction port of the vacuum blower 6, a ventilation shaft 4 sleeved on the outer circumference of the exhaust pipe 2 and an injection and suction device 3 for absorbing gas and liquid and injecting gas;
the spraying and sucking device 3 comprises a spraying head 32 arranged in the ventilation shaft 4 and a driving device 31 for driving the spraying head 32 to rotate; the injector head 32 is disposed within the ventilation shaft 4; the driving device 31 is arranged at the upper part of the exhaust pipe 2; and the tail gas treatment device 5 is communicated with the tail gas discharge pipeline 1. The inner wall of the ventilation shaft 4 is provided with a left spiral groove 41A extending along the axial direction of the ventilation shaft 4 and a right spiral groove 41B communicated with the tail end of the left spiral groove 41A in a crossed manner; the tail end of the right spiral groove 41B is in cross communication with the starting end of the left spiral groove 41A; the injector head 32 spirally rotates along the left and right spiral grooves 41A and 41B.
The driving device 31 is started firstly, the driving device 1 drives the spraying and sucking device 3 to perform spiral motion in the ventilation shaft 4, meanwhile, the vacuum blower 6 starts to pump air, the prior flow caused by uneven soil pores and pollutant components cause difference of pollutant volatility degrees, after SVE starts, air in the soil pores is pumped out, the pollutant concentration in a gas phase is reduced, pollutants in NAPL phase, adsorption phase and dissolution phase are transferred to the gas phase continuously, and the pollutants are removed gradually by taking soil gas as a carrier. In the early stage of SVE, the pollutants are mainly present in NAPL phase, NAPL plays a dominant role in phase-to-phase mass transfer of the gas phase, and the pollutant concentration in the tail gas is higher. With the operation of SVE, only the dissolved phase and the adsorption phase are transferred to the gas phase after the NAPL phase disappears, the concentration of pollutants in the tail gas is sharply reduced and maintained at a lower level, the vacuum blower 6 exhausts while exhausting, and the tail gas is treated by the tail gas treatment device 5 and then reaches the emission standard and is then discharged.
The driving device 31 comprises a motor 315, a transmission shaft 314 fixedly connected to an output shaft of the motor 315, a driving gear 313 fixedly connected to the transmission shaft 314, a driven gear 312 engaged with the driving gear 313, and a dial shaft 316 fixedly and uniformly distributed on a lower end face of the driven gear 312; the number of the shifting shafts 316 is more than two; the driving device 31 further includes a sliding plate 311 sleeved on the two or more dial shafts 316; the sprayer head 32 is arranged at the lower end of the sliding disc 311;
the driven gear 312 is fixedly connected to the exhaust tube 2; the sliding plate 311 rotates along the axis of the exhaust pipe 2.
A linear bearing 318 is arranged between the sliding disc 311 and the exhaust pipe 2; an oilless bearing 317 is arranged between the sliding plate 311 and the shifting shaft 316.
The sprayer head 32 comprises a cross coupling 321, one end of which is fixedly connected with the lower end surface of the sliding disc 311, a spraying and sucking conduit 322 connected with the other end of the cross coupling 321, and a spraying and sucking nozzle 323 fixedly connected with the lower end of the spraying and sucking conduit 322; the section of the spray nozzle 323 is in a regular trapezoid shape; the spray nozzle 323 is adapted to the left spiral groove 41A and the right spiral groove 41B. The spraying and sucking conduit 322 comprises a central conduit 3221 and a sucking conduit 3222 sleeved on the outer circumference of the central conduit 3221; the spray nozzle 323 comprises a spray cavity 3231, an adsorption cavity 3232 surrounding the outside of the spray cavity 3231, an adsorption wall 3234 provided on the outer circumference of the adsorption cavity 3232, and a spray head 3233 connected to the lower end of the spray cavity 3231; the spraying and sucking device 3 further comprises a first bracket 35 fixedly connected to one end of the cross coupling 321, a second bracket 36 fixedly connected to the other end of the cross coupling 321, a connector 34 arranged on the spraying and sucking conduit 322, an air spraying pipe 37 with one end communicated with the connector 34, and a spraying blower 33 communicated with the other end of the air spraying pipe 37; the gas lance 37 is in communication with the central conduit 3221; the gas injection pipe 37 penetrates through the sliding disc 311, the first bracket 35 and the second bracket 36; the adsorption wall 3234 is provided with adsorption holes 3236 which are uniformly distributed, the suction duct 3222 is communicated with the adsorption cavity 3232, one side of the upper end of the suction duct 3222 is connected with a suction joint 38, and the suction joint is communicated with the vacuum blower 6. A filter belt 3235 is arranged on the inner wall of the left spiral groove 41A; and a filter belt 3235 is arranged on the inner wall of the right spiral groove 41B.
The pipeline of the vacuum blower 6 communicated with the exhaust pipe 2 also comprises an on-off device 7; the on-off device 7 comprises an on-off cylinder 71, an on-off sliding plate 72 fixedly connected to a piston rod of the on-off cylinder 71 and an on-off sliding seat 73 in sliding connection with the on-off sliding plate 72; an on-off sliding plate hole 721 is formed in the on-off sliding plate 72; the number of the on-off slide holes 721 is one; the on-off sliding seat 73 is provided with an on-off sliding seat hole 722; the axis of the on-off sliding plate hole 721 and the axis of the on-off sliding seat hole 722 are on the same vertical line; the number of the on-off slider holes 722 is one.
The air permeability of the soil can be reduced when the water content is increased, and the volatilization of pollutants is not facilitated; on the other hand, the polarity of water molecules is generally stronger than that of VOCs, the water molecules are more easily combined with organic matters of soil, the increase of the water content can reduce the adsorption degree of soil particles to organic matter molecules, and the volatilization process is promoted. When the water content of the soil is 61%, the liquid-gas mass transfer process is greatly limited, and the tailing phenomenon can occur quickly. Research shows that in the soil with the organic matter content of 0.4%, the removal rate of chlorobenzene is reduced when the water content is increased, but in the soil with the organic matter content of 5.4%, the removal rate of chlorobenzene is increased firstly and then reduced along with the increase of the water content. In this embodiment, the water molecules in the soil are extracted in advance through the absorption hole 3236 at the spraying nozzle and the exhaust tube 2. The working steps are as follows: the motor 315 is started to drive the driving gear 313 to rotate, so that the driven gear 312 rotates, the shifting shaft 316 which is fixedly connected to the lower end of the driven gear 312 and evenly distributed along the circumference of the driven gear 312 shifts and rotates the sliding disc 311, so that the cross coupling 321 is driven, a T-shaped groove is formed in the lower end face of the sliding disc 311, a convex face matched with the T-shaped groove is formed in the upper end of the cross coupling 321, and the cross coupling 321 is in sliding connection with the circumference of the lower end of the sliding disc along the axis of the driven gear 312. The other end of the cross-shaped coupling 312 can rotate freely, and because the spray suction nozzle 323 is arranged in the left spiral groove 41A and can not be separated, the spray suction nozzle 323 moves from top to bottom along the track of the left spiral groove 41A, moves from bottom to top along the track of the right spiral groove 41B when reaching the end point of the left spiral groove 41A, and repeatedly moves in the way; thereby generating the effect of pumping away a part of steam water molecules in the soil.
Example 2
The on-off device 7 further comprises a transposition air cylinder 74, a transposition sliding plate 75 fixedly connected to a piston rod of the transposition air cylinder 74 and a transposition sliding seat 76 in sliding connection with the transposition sliding plate 75; the transposition slide carriage 76 is fixedly connected to the suction port installation side of the vacuum blower 6; a first transposition slide seat hole and a second transposition slide seat hole are formed in the transposition slide seat 76; the axis of the first transposition sliding seat hole and the axis of the second transposition sliding seat hole are on the same horizontal line; the first transposition sliding seat hole and the left suction port A are coaxial, and the second transposition sliding seat hole and the right suction port B are coaxial; more than one transposition slide plate hole is formed in the transposition slide plate 75; the transposition slide 76 is arranged crosswise to the on-off slide 73. The on-off slide 73 is fixedly connected to the transposition slide 75.
Use air pressure device to change soil inner structure to improve soil air permeability, get rid of more VOCs soil moisture and can occupy the soil pore passageway. In the above embodiment, the vacuum blower 6 starts to suck air from the left suction port a and simultaneously starts the jetting blower 33 to jet the soil over the whole area by the jetting head 3233, thereby improving the pollutant decomposition capability. The spray nozzle 323 further includes a check valve 3237 disposed within the spray head 3233; the check valve 3237 is in a communicating state from the top down. The spray nozzle 323 can only spray gas to prevent the nozzle 323 from being clogged with foreign materials, and the front end of the nozzle 323 has a conical shape with a spray angle of about 120 degrees.
The transposition air cylinder 74 can push the on-off sliding seats to alternate at the left suction port A and the right suction port B, and different repairing schemes can be adjusted according to different soil characteristics.
Adsorption and air injection restoration experiments are carried out on the petroleum industry polluted site, the concentration of benzene in unsaturated soil gas is reduced to be below the detection limit from 15-60 mg/L after 7 months, and the concentration of TPH in underground water is reduced to be below 0.5mg/L from 25-50 mg/L. Investigation is carried out on a certain oil storage tank leakage pollution site, water molecule adsorption and air injection can improve the restoration effect of low-permeability soil, 608kg of gasoline is removed after 44 days of treatment, the BETX concentration in an aeration zone is reduced from 5g/t to 1g/t, and the removal rate reaches 14.3 kg/d.
Some volatile light components in petroleum products, such as gasoline, can be quickly removed by SVE, but some non-volatile heavy components, such as diesel oil, fuel oil, kerosene, lubricating oil and the like, have serious limitations on the application of SVE. The researches show that when the temperature of the soil rises to 50-150 ℃, the removal rate and the range of the removable pollutants are increased. SVE can remove all contaminants if the soil temperature rises to a level where the organic vapor pressure is above 70 Pa. Air at an air outlet of the jet blower is heated, a hot air injection technology is adopted to perform on-site pilot test on a certain diesel oil polluted site, and after the system is operated for 1 month, the removal rate of TPH in soil can reach more than 95%.
While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various modifications, changes, substitutions and alterations can be made to this embodiment without departing from the principles of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims (7)
1. The organic contaminated soil vapor phase extraction equipment comprises a tail gas discharge pipeline (1), and is characterized in that: comprises a vacuum blower (6) communicated with the tail gas discharge pipeline (1), an exhaust pipe (2) communicated with a suction port of the vacuum blower (6), a ventilation shaft (4) sleeved on the outer circumference of the exhaust pipe (2) and an injection and suction device (3) for absorbing gas and liquid and injecting gas;
the spraying and sucking device (3) comprises a spraying machine head (32) arranged in the ventilation shaft (4) and a driving device (31) for driving the spraying machine head (32) to rotate;
the injector head (32) is arranged in the ventilation shaft (4);
the driving device (31) is arranged at the upper part of the exhaust pipe (2);
the tail gas treatment device (5) is communicated with the tail gas discharge pipeline (1);
the inner wall of the ventilation shaft (4) is provided with a left spiral groove (41A) extending along the axial direction of the ventilation shaft (4) and a right spiral groove (41B) communicated with the tail end of the left spiral groove (41A) in a crossed mode;
the tail end of the right spiral groove (41B) is in cross communication with the starting end of the left spiral groove (41A);
the injection machine head (32) spirally rotates along the left spiral groove (41A) and the right spiral groove (41B);
the pipeline of the vacuum blower (6) communicated with the air exhaust pipe (2) also comprises an on-off device (7);
the on-off device (7) comprises an on-off cylinder (71), an on-off sliding plate (72) fixedly connected to a piston rod of the on-off cylinder (71) and an on-off sliding seat (73) in sliding connection with the on-off sliding plate (72);
an on-off sliding plate hole (721) is formed in the on-off sliding plate (72);
the number of the on-off slide plate holes (721) is one;
the on-off sliding seat (73) is provided with an on-off sliding seat hole (722);
the axis of the on-off sliding plate hole (721) and the axis of the on-off sliding seat hole (722) are on the same vertical line;
the number of the on-off sliding seat holes (722) is one;
the vacuum blower (6) comprises a left suction port A and a right suction port B;
the on-off device (7) further comprises a transposition air cylinder (74), a transposition sliding plate (75) fixedly connected to a piston rod of the transposition air cylinder (74), and a transposition sliding seat (76) in sliding connection with the transposition sliding plate (75);
the transposition sliding seat (76) is fixedly connected to the suction port installation side of the vacuum blower (6);
a first transposition sliding seat hole and a second transposition sliding seat hole are formed in the transposition sliding seat (76);
the axis of the first transposition sliding seat hole and the axis of the second transposition sliding seat hole are on the same horizontal line;
the first transposition sliding seat hole and the left suction port A are coaxial, and the second transposition sliding seat hole and the right suction port B are coaxial;
more than one transposition slide plate hole is formed in the transposition slide plate (75);
the transposition sliding seat (76) and the on-off sliding seat (73) are arranged in a crossed mode.
2. The organic contaminated soil vapor phase extraction apparatus as recited in claim 1, wherein:
the driving device (31) comprises a motor (315), a transmission shaft (314) fixedly connected to an output shaft of the motor (315), a driving gear (313) fixedly connected to the transmission shaft (314), a driven gear (312) meshed with the driving gear (313), and a shifting shaft (316) fixedly and uniformly distributed on the lower end face of the driven gear (312);
the number of the shifting shafts (316) is more than two;
the driving device (31) further comprises a sliding disc (311) sleeved on the more than two shifting shafts (316);
the injection machine head (32) is arranged at the lower end of the sliding disc (311);
the driven gear (312) is fixedly connected to the air suction pipe (2);
the sliding disc (311) rotates along the axis of the air suction pipe (2).
3. The vapor phase extraction equipment for organic contaminated soil according to claim 2, wherein:
a linear bearing (318) is arranged between the sliding disc (311) and the air suction pipe (2);
an oilless bearing (317) is arranged between the sliding disc (311) and the shifting shaft (316).
4. The vapor phase extraction equipment for organic contaminated soil according to claim 2, wherein:
the spraying machine head (32) comprises a cross coupling (321) with one end connected to the lower end face of the sliding disc (311), a spraying and sucking conduit (322) connected to the other end of the cross coupling (321), and a spraying and sucking nozzle (323) fixedly connected to the lower end of the spraying and sucking conduit (322);
the section of the spray nozzle (323) is in a regular trapezoid shape;
the spray nozzle (323) is matched with the left spiral groove (41A) and the right spiral groove (41B).
5. The vapor phase extraction apparatus for organic contaminated soil according to claim 4, wherein:
the spraying and sucking conduit (322) comprises a central conduit (3221) and a sucking conduit (3222) sleeved on the outer circumference of the central conduit (3221);
the spray nozzle (323) comprises a spray cavity (3231), a suction cavity (3232) surrounding the spray cavity (3231), a suction wall (3234) arranged on the outer circumference of the suction cavity (3232), and a spray head (3233) connected to the lower end of the spray cavity (3231);
the spraying and sucking device (3) further comprises a first support (35) fixedly connected to one end of the cross coupling (321), a second support (36) fixedly connected to the other end of the cross coupling (321), a connector (34) arranged on the spraying and sucking guide pipe (322), an air spraying pipe (37) with one end communicated with the connector (34) and a spraying blower (33) communicated with the other end of the air spraying pipe (37);
the gas lance (37) is communicated with the central conduit (3221);
the gas injection pipe (37) penetrates through the sliding disc (311), the first bracket (35) and the second bracket (36);
the adsorption wall (3234) is provided with adsorption holes (3236) which are uniformly distributed;
the lower end of the suction conduit (3222) is communicated with the adsorption cavity (3232);
the upper end of the air suction duct (3222) is communicated with the vacuum blower (6);
one side of the upper end of the air suction conduit (3222) is connected with an air suction joint (38), and the air suction joint (38) is communicated with the vacuum blower (6).
6. The vapor phase extraction apparatus for organic contaminated soil according to claim 5, wherein:
the spray nozzle (323) further comprises a one-way valve (3237) disposed within the spray head (3233);
the check valve (3237) is in a communicating state from top to bottom.
7. The organic contaminated soil vapor phase extraction apparatus as recited in claim 1, wherein:
a filter belt (3235) is arranged on the inner wall of the left spiral groove (41A);
and a filter belt (3235) is arranged on the inner wall of the right spiral groove (41B).
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| CN110404951A (en) * | 2019-07-16 | 2019-11-05 | 煜环环境科技有限公司 | A kind of soil vapor extraction system for contaminated soil remediation |
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| US5116515A (en) * | 1991-04-24 | 1992-05-26 | Soil Guardian Inc. | Process and apparatus for removing volatile organic compounds from contaminated vadose soil areas |
| AU2011322707A1 (en) * | 2010-10-25 | 2013-05-30 | Tps Technologies | Devices and methods for soil remediation |
| US20150034328A1 (en) * | 2013-08-01 | 2015-02-05 | Mohamed Abouodah | Groundwater remediation apparatus and method |
| CN107639104A (en) * | 2016-07-22 | 2018-01-30 | 罗伯特·丹尼尔·斯拉贝 | Multiphase Soil Vapor Phase Extractor |
| CN106623388A (en) * | 2017-02-08 | 2017-05-10 | 上海置浦环境科技有限公司 | Novel extraction dropping pipe applied to multiphase extraction device and control method of novel extraction dropping pipe |
| CN108906869A (en) * | 2018-08-14 | 2018-11-30 | 中节能城市节能研究院有限公司 | A kind of contaminated soil in-situ heat repair system and method using distributed energy |
| CN211707713U (en) * | 2020-01-06 | 2020-10-20 | 北京高能时代环境技术股份有限公司 | Multifunctional well |
| CN111992577A (en) * | 2020-08-19 | 2020-11-27 | 上海市环境工程设计科学研究院有限公司 | Heating well for polluted site gas thermal desorption repair device |
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