CN113414229A - Method for repairing soil groundwater by adopting double-fluid injection integrated system - Google Patents
Method for repairing soil groundwater by adopting double-fluid injection integrated system Download PDFInfo
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- CN113414229A CN113414229A CN202110680143.1A CN202110680143A CN113414229A CN 113414229 A CN113414229 A CN 113414229A CN 202110680143 A CN202110680143 A CN 202110680143A CN 113414229 A CN113414229 A CN 113414229A
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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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
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a method for repairing soil underground water by adopting a double-fluid injection integrated system, which comprises the steps of transferring the integrated skid-mounted system to the vicinity of an injection point, and directly pressing an injection rod to the underground repairing depth by using a pressing device; the gas-liquid double-fluid injection adopts double-pipe rotary injection that an air compressor and an injection pump are connected with an injection rod, compressed air drives a spray head to rotate, and simultaneously gas is utilized to cut a soil body, so that atomization of liquid medicament is realized, the liquid medicament is smoothly dispersed in a low-permeability stratum and is fully mixed and contacted with pollutants, and the gas-coated double-fluid injection can be simultaneously suitable for pollution remediation of gas-coated soil, saturated soil and underground water. The method provided by the invention adopts a set of integrated system, can complete in-situ injection repair of soil and underground water, achieves simultaneous injection of two fluids of liquid medicament and gas, and enhances the dispersion, diffusion and permeability of the medicament and the mixing capability of the medicament and underground pollutants, thereby improving the repair efficiency and the repair effect.
Description
Technical Field
The invention relates to an in-situ injection technology used in the technical field of environmental remediation, in particular to a method for remediating soil and underground water pollution of a low-permeability stratum by using a mobile double-fluid injection integrated system.
Background
China has long regarded the petrochemical industry as an important pillar industry. The petrochemical enterprises have the characteristics of large water consumption, large water discharge, transportation requirements on raw materials and products and the like, so that the petrochemical enterprises have the layout characteristics of facing the sea, the river and the lake. In which there are dozens of thousands of chemical enterprises along the bank of the Yangtze river, and the economic zone of the Yangtze river bears 30% of petrochemical industry in China on 21% of land. The problems of possible pipeline and storage tank leakage or wastewater discharge in the chemical industry can cause serious pollution to soil and underground water, the related main pollutants comprise petroleum hydrocarbon, benzene series, polycyclic aromatic hydrocarbon, phenols, chlorinated hydrocarbon and the like, and the substances can cause serious harm to health after entering human bodies.
The conventional remediation method for the pollution in the petrochemical site is in-situ remediation. Compared with ex-situ remediation, in-situ remediation does not involve soil or underground water dredging/pumping out, transportation and storage, can reduce remediation cost and effectively prevent secondary pollution, and is also suitable for sites unsuitable for large-scale excavation. The in-situ injection repairing technology included in the in-situ repair refers to the purpose of repairing soil or underground water by injecting and adding a specific repairing medicament to react with underground pollutants and converting the pollutants into non-toxic or low-toxic substances. Compared with other in-situ repair technologies, in-situ injection has the outstanding advantages of high efficiency, wide application range and the like.
The conventional in-situ injection technology adopted in the soil and underground water remediation engineering mainly comprises direct-pressure high-pressure injection and injection well injection, and is mainly suitable for pollution remediation of soil and underground water in a saturated zone. The direct-pressure high-pressure injection is to inject a prepared liquid medicament into a polluted soil layer through an injection pump by directly pressing the liquid medicament into an underground injection rod for repairing. The injection of injection well is for setting up the injection well in the restoration region, and liquid remediation medicament gets into the contaminated soil layer through the injection well under the pressure of syringe pump and realizes polluting the restoration. The disadvantages of these conventional injection techniques are: the method mainly relies on pores and cracks in soil layers as channels to disperse and repair the medicament and helps the medicament to further diffuse through underground water flow, so that the method is mainly suitable for uniform and high-permeability saturated zone strata.
Areas of the economic zone of Yangtze river in China gathered by petrochemical enterprises have the characteristics of low soil permeability, more adhesive/interlayer, shallow underground water level and poor permeability. If conventional injection techniques are used, the function of the remediation agent will be primarily to areas of high hydraulic conductivity due to the presence of preferential flow pathways and the remediation effect will be primarily limited to highly permeable formations. The pollutants remained in the low-permeability soil layer can slowly diffuse into the high-permeability soil layer due to the concentration gradient, become long-term secondary sources of the pollutants, inhibit the repairing effect and cause tailing of repairing work and even rebound. Diffusion of contaminants in low permeability zones can be as long as years to decades, and inclusion of low permeability and high permeability formations in the land mass makes the defect more pronounced, which also greatly increases the difficulty of overall repair.
In the Chinese invention patent 'soil and groundwater in-situ injection-high pressure jet grouting injection in-situ remediation system and method' with the application number of 201610464626.7, a technology for in-situ injection by using a high pressure jet grouting method for foundation treatment in the field of rock and soil is provided, so as to solve the problem of in-situ injection in low permeability areas. The injection device has the problems that the required injection pressure is high (25-30 Mpa), the requirement on equipment is high, and certain danger exists in the field operation process; the damage to the soil body structure can be caused, the bearing capacity of the soil body can be greatly reduced, and the effect on partial shallow soil layers is limited; the injection flow is large, so that slurry return and slurry outflow are easily caused, and medicament waste and secondary pollution are caused; when the equipment moves, all parts of the system need to be frequently disassembled and assembled.
Disclosure of Invention
The invention aims to provide a method for repairing soil and underground water pollution of a low-permeability stratum by using an in-situ repairing mobile double-fluid injection integrated system, which solves the defects and shortcomings of the existing in-situ injection technology, completes gas and liquid double-fluid injection on the stratum, further improves the repairing efficiency and reduces the repairing time and cost.
In order to achieve the aim, the invention provides a method for restoring soil underground water by adopting a double-fluid injection integrated system, wherein the integrated system comprises an injection unit, a dispensing unit and an auxiliary unit; the injection unit comprises an injection pump, an air compressor, an injection rod, an injection ejector rod, a connecting cavity, an injection head, a spray head shell and an injection control mechanism; the dispensing unit comprises a medicament dispensing groove and a medicament storage groove; the auxiliary unit comprises an electric control cabinet, a rod piece box, a pressing device and a skid-mounted platform; the injection unit, the dispensing unit and the auxiliary unit are all integrated on the skid-mounted platform.
The method for restoring the soil and the underground water by adopting the double-fluid injection integrated system is characterized in that the electric control cabinet, the rod piece box, the pressing device, the injection ejector rod, the air compressor, the injection pump, the medicament storage tank and the medicament preparation tank are sequentially arranged above the skid-mounted platform along the horizontal direction; the injection rod is vertically and downwards arranged on the skid-mounted platform, and the connecting cavity, the injection head and the nozzle shell are vertically arranged below the skid-mounted platform and connected with the injection rod; the injection ejector rod is vertically downwards connected with and communicated with the injection rod, the connecting cavity is arranged at the bottom end of the injection rod, the bottom of the connecting cavity is connected with the injection head, and the spray head shell is sleeved outside the injection head; the pressing device is fixed on the skid-mounted platform and used for mounting the injection rod.
The method for restoring the soil groundwater by adopting the double-fluid injection integrated system is characterized in that the auxiliary unit further comprises a cable and a pipeline; the pipeline comprises a medicine delivery hose and a compressed air hose; the cable is arranged among the electric control cabinet, the injection unit, the dispensing unit and the pressing device; the pressing device, the injection control mechanism, the injection pump and the air compressor are respectively connected with the electric control cabinet through cables; the medicine conveying hose and the compressed air hose are arranged between the injection unit and the dispensing unit; the medicament configuration groove, the medicament storage groove and the injection pump are sequentially connected through a medicament delivery hose, the outlet of the injection pump is connected with the injection ejector rod through the medicament delivery hose, and the outlet of the air compressor is connected with the injection ejector rod through a compressed air hose.
In the method for restoring the soil and the underground water by adopting the double-fluid injection integrated system, in the auxiliary unit, a skid-mounted platform is integrated with a whole bearing system, and universal wheels with self-locking structures are arranged at the bottoms of two sides; the pressing device comprises a hydraulic oil cylinder, an electromagnetic regulating valve, an electromagnetic reversing valve, a hydraulic one-way valve and a gear pump, and is used for pressing the injection rod; the rod box stores rods containing injection rods; and the electric control cabinet completes the integral power access and distribution of the system.
The method for restoring the soil groundwater by adopting the double-fluid injection integrated system is characterized in that 380V three-phase power input is adopted in the system.
In the method for restoring the soil and the underground water by adopting the double-fluid injection integrated system, in the dispensing unit, the stirrer is arranged in the medicament dispensing groove and is provided with liquid level scales, and the top of the medicament dispensing groove is also provided with the dosing metering mechanism.
In the method for restoring the soil groundwater by adopting the dual-fluid injection integrated system, the injection control mechanism in the injection unit comprises a pressure gauge, a flowmeter and an adjusting valve, and is connected with the injection pump and the air compressor and respectively adjusts the flow rate of the injection pump and the air compressor for control.
In the injection unit, the injection ejector rod is of a double-layer pipe structure, an outer cavity is formed between the outer layer pipe and the inner layer pipe, an inner cavity is arranged in the inner layer pipe, 2 inlet channels are arranged on the injection ejector rod and are respectively connected with an air compressor and an injection pump, and the lower part of the injection ejector rod is connected with the injection rod through threads; the injection rod is composed of a plurality of connected rods, each injection rod is of a double-layer pipe structure, an outer cavity is formed between the outer layer pipe and the inner layer pipe, an inner cavity is arranged in the inner layer pipe and is respectively communicated with the outer cavity and the inner cavity of the injection ejector rod, the inner cavity is connected with the injection pump through the injection ejector rod, and the outer cavity is connected with the air compressor; the two injection rods are fixedly connected through threads, and the injection rod at the lowest end is connected with the connecting cavity; the top end of the connecting cavity is connected with the injection rod, and the bottom end of the connecting cavity is connected with the injection head.
The method for restoring the soil groundwater by adopting the double-fluid injection integrated system is characterized in that the injection head is a double-fluid rotary nozzle driven by compressed air and is connected to the connecting cavity through threads; the injection head is covered and protected by the nozzle shell when pressed into a soil layer, the top of the nozzle shell is conical, and the rear part of the nozzle shell is cylindrical and is connected with the connecting cavity through the sliding strip.
The method for remediating soil groundwater by using the dual-fluid injection integrated system comprises the following steps: step 1, hoisting by using a hoisting device and placing a skid-mounted platform to a repair site; step 2, moving the skid-mounted platform to an injection point, aligning the pressing device with the injection point, and locking a self-locking structure of the universal wheel under the skid-mounted platform; turning on a power supply, and starting a stirrer in the medicament preparation groove to prepare the medicament; step 3, assembling the double-fluid rotary injection head, the connecting cavity, the nozzle shell and the injection rod and fixing the double-fluid rotary injection head, the connecting cavity, the nozzle shell and the injection rod to a pressing device; starting a pressing device to start pressing; after the first injection rod is pressed downwards, the fixing is released, the second injection rod is connected and fixed on the pressing device, and the second injection rod is pressed downwards again; step 4, repeating the step 3 until the actual pressing depth exceeds the designed maximum injection depth by 0.5m, fixing the injection rod, and assembling the injection ejector rod on the top of the uppermost injection rod; step 5, lifting the injection rod integrally to enable the double-fluid rotary injection head to reach the designed injection depth, and enabling the spray head shell to slide downwards along the sliding strip to expose the injection head; step 6, connecting an injection pump and an air compressor with an injection ejector rod; the air compressor is connected to the outer cavity of the injection ejector rod, and the injection pump is connected to the inner cavity of the injection ejector rod; step 7, starting the injection unit; the injection pump and the air compressor respectively inject the prepared liquid medicament and compressed air into the inner cavity and the outer cavity of the injection ejector rod and the injection rod, and the liquid medicament and the compressed air enter the connecting cavity along the injection rod; the medicament and compressed air enter the double-fluid rotary injection head from the connecting cavity, and the compressed air drives the rotary nozzle to rotate, so that the medicament is atomized and then is sprayed out; step 8, lifting the injection rod to the next injection depth, and repeating the steps 6 to 8 until all the designed injection depths of the injection points complete the injection of the medicament; and 9, repeating the steps 2 to 8 until all the designed injection points complete the injection of the medicament.
The method for repairing the soil groundwater by adopting the double-fluid injection integrated system has the following advantages:
(1) the complete system is integrated on the skid-mounted platform, so that the hoisting and the transportation are convenient, the time required by the steps of disassembling, assembling, debugging and the like is saved, the labor intensity of constructors is reduced, and the repair construction efficiency is improved. The universal wheels with self-locking structures are arranged below the skid-mounted platform, so that the system can move between injection points conveniently. The skid-mounted platform and the system carried by the skid-mounted platform are used as a counter force overcoming mechanism when the injection rod is pressed down, so that the pressing down is more stable.
(2) Static hydraulic pressure is used in the pushing down of injection pole in the injection process, has avoided the horizontal disturbance that the operation such as hammering pushed down caused, reduces the influence to the soil layer, can effectively avoid the problem such as the thick liquid that emits in the injection process, and compares in high-pressure injection, and the system energy consumption is lower.
(3) The shearing and striking effect of the double-fluid injection on the soil can help to open originally closed pores in part of the soil, increase the effective porosity of the soil, enable the repairing agent to be in more sufficient contact with the polluted soil underground water, and reduce the phenomenon of slurry bleeding; meanwhile, pollutants originally sealed in the non-communicated pores are increased due to the increase of effective porosity and the opening of the micro-channel, and are also increased to be in mixed contact with the medicament and removed through reaction.
(4) The double-fluid injection head is a rotary nozzle, is driven to rotate by compressed air, and enables the injection of the medicament to be more uniform through rotary spraying. Part of the compressed gas will escape upwards after entering the soil pores, helping in the process to open up the soil pores longitudinally, further helping to disperse the remediation agent in the vertical direction.
(5) The gas and liquid double-fluid simultaneous injection can form effective turbulence, and the diffusion speed of the medicament in soil gaps is accelerated; the irregular movement of the turbulent flow enables the gas and the liquid to be strongly mixed, so that the medicament is more uniformly distributed; and the turbulence increases the friction, which is beneficial to the full contact of the medicament and the pollutants, thereby strengthening the reaction of the medicament and the pollutants.
(6) The medicament can be effectively atomized by the rotary injection of the double-fluid rotary injection head and the matching of the two fluids of the compressed gas, so that the liquid drops can be dispersed along with the gas in the aeration zone, the size of the liquid drops can be reduced, the number of the liquid drops is increased, the surface area of the medicament is increased, and the application of the injection technology in the pollution remediation of the direct aeration zone is realized; the atomized small liquid drops can enable the agent to enter and be more uniformly dispersed in soil pores and micro-channels, so that the dispersion and diffusion effects of the repairing agent in an aeration zone and a low-permeability stratum are improved, the long-term reverse diffusion caused by slow release of residual pollutants in the low-permeability stratum is reduced or eliminated, and the problems of 'tailing' and rebound of repairing engineering are solved.
Drawings
Fig. 1 is a schematic structural diagram of a method for remediating soil groundwater using a dual fluid injection integrated system according to the present invention.
FIG. 2 is a schematic view of the connection chamber and the showerhead housing in a closed state in the integrated system of the present invention.
FIG. 3 is a schematic cross-sectional view of a dual fluid rotary nozzle of an injection head in an integrated system of the present invention.
Fig. 4 is a schematic diagram of the injection component of the integrated system of the present invention in an injection state.
Wherein: 1. an electric control cabinet; 2. an injection pump; 3. an air compressor; 4. an injection rod; 5. injecting a mandril; 5-1, an outer cavity inlet; 5-2, an inner cavity inlet; 6. a connecting cavity; 7. an injection head; 7-1, rotating a nozzle; 8. a nozzle housing; 9. a medicament disposition slot; 10. a medicament storage tank; 11. a rod box; 12. a pressing device; 13. skid-mounting a platform; 14. a slide bar; 15. an injection control mechanism.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention provides a method for restoring soil groundwater by adopting a double-fluid injection integrated system, which comprises an injection unit, a dispensing unit and an auxiliary unit; the injection unit comprises an injection pump 2, an air compressor 3, an injection rod 4, an injection ejector rod 5, a connecting cavity 6, an injection head 7, a spray head shell 8 and an injection control mechanism 15; the dispensing unit comprises a medicament dispensing groove 9 and a medicament storage groove 10; the auxiliary unit comprises an electric control cabinet 1, a rod piece box 11, a pressing device 12 and a skid-mounted platform 13; the injection unit, the dispensing unit and the auxiliary unit are all integrated on the skid-mounted platform 13.
Preferably, the electric control cabinet 1, the rod box 11, the pressing device 12, the injection ejector rod 5, the air compressor 3, the injection pump 2, the medicament storage tank 10 and the medicament configuration tank 9 are sequentially arranged above the skid-mounted platform 13 along the horizontal direction; the injection rod 4 is vertically arranged downwards from the skid-mounted platform 13, and the connecting cavity 6, the injection head 7 and the nozzle shell 8 are arranged below the skid-mounted platform 13 along the vertical direction and are connected with the injection rod 4.
The injection ejector rod 5 is vertically downwards connected with and communicated with the injection rod 4, the connecting cavity 6 is arranged at the bottom end of the injection rod 4, the bottom of the connecting cavity 6 is connected with the injection head 7, and the spray head shell 8 is sleeved outside the injection head 7; the pressing device 12 is fixed on a skid-mounted platform 13 and is used for mounting the injection rod 4.
The auxiliary unit also comprises a cable and a pipeline; the pipeline comprises a medicine delivery hose and a compressed air hose; the cable is arranged between the electric control cabinet 1 and the injection unit, the dispensing unit and the pressing device 12; the pressing device 12, the injection control mechanism 15, the injection pump 2 and the air compressor 3 are respectively connected with the electric control cabinet 1 through cables; the medicine conveying hose and the compressed air hose are arranged between the injection unit and the dispensing unit; the medicament configuration groove 9, the medicament storage groove 10 and the injection pump 2 are sequentially connected through a medicament delivery hose, the outlet of the injection pump 2 is connected with the injection ejector rod 5 through the medicament delivery hose, and the outlet of the air compressor 3 is connected with the injection ejector rod 5 through a compressed air hose.
The skid-mounted platform 13 in the auxiliary unit is integrated with a whole bearing system, universal wheels with self-locking structures are mounted at the bottoms of two sides of the skid-mounted platform, the skid-mounted platform is convenient to move, and the skid-mounted platform 13 is used as a counter force overcoming mechanism when the whole skid-mounted platform is pressed down; the pressing device 12 comprises a hydraulic oil cylinder, an electromagnetic regulating valve, an electromagnetic reversing valve, a hydraulic one-way valve and a gear pump, and is used for pressing the injection rod 4; the rod case 11 stores therein rods including the injection rod 4; the electric control cabinet 1 completes the whole electric power access and distribution of the system.
The system uses a 380V three-phase power input.
A stirrer is arranged in a medicament configuration groove 9 in the dispensing unit, the liquid level scale is arranged in the medicament configuration groove, and a dosing metering mechanism is arranged at the top of the medicament configuration groove. The drug storage tank 10 is connected to the drug disposition tank 9 for storing the disposed drug solution, and is connected to the injection unit through a drug delivery hose. The dosing metering mechanism is an accumulation flow meter.
The injection control mechanism 15 in the injection unit comprises a pressure gauge, a flow meter and an adjusting valve, and the injection control mechanism 15 is connected with the injection pump 2 and the air compressor 3 and respectively adjusts the flow rate thereof for control. The outlets of the injection pump 2 and the air compressor 3 are connected with an injection mandril 5 through pipelines. The injection control mechanism 15 is used to regulate the flow rate of the injection pump 2 and the air compressor 3.
An injection ejector rod 5 in the injection unit is of a double-layer pipe structure, an outer cavity is formed between an outer layer pipe and an inner layer pipe, an inner cavity is arranged in the inner layer pipe, 2 inlet channels are arranged on the injection ejector rod 5 and are respectively connected with an air compressor 3 and an injection pump 2, and the lower part of the injection ejector rod 5 is connected with an injection rod 4 through threads; the injection rod 4 is formed by connecting a plurality of rods, and each rod is of a double-layer tube structure, namely a double-layer tube; an outer cavity is also formed between the outer layer pipe and the inner layer pipe, an inner cavity is arranged in the inner layer pipe and is respectively communicated with the outer cavity and the inner cavity of the injection ejector rod 5, the inner cavity is connected with the injection pump 2 through the injection ejector rod 5, and the outer cavity is connected with the air compressor; the two injection rods 4 are fixedly connected through threads, and the injection rod 4 at the lowest end is connected with the connecting cavity 6; the top end of the connecting cavity 6 is connected with the injection rod 4, and the bottom end is connected with the injection head 7.
The injection head 7 is a double-fluid rotary nozzle driven by compressed air, is provided with a rotary nozzle 7-1 and is connected to the connecting cavity 6 through threads; the injection head 7 is covered and protected by a nozzle shell 8 when being pressed into a soil layer, the top of the nozzle shell 8 is conical, the rear part of the nozzle shell 8 is cylindrical, and the nozzle shell is connected with the connecting cavity 6 through a slide bar 14.
The invention provides a method for repairing soil groundwater by adopting a double-fluid injection integrated system, which comprises the following steps:
And 4, repeating the step 3 until the actual pressing depth exceeds the designed maximum injection depth by 0.5m, fixing the injection rod 4, and assembling the injection ejector rod 5 at the top of the injection rod 4 at the uppermost end.
And step 5, lifting the injection rod 4 integrally to enable the double-fluid rotary injection head 7 to reach the designed injection depth, and enabling the spray head shell 8 to slide downwards along the sliding strip 14 to expose the injection head 7.
And 8, lifting the injection rod 4 to the next injection depth, and repeating the steps 6 to 8 until all the designed injection depths of the injection points complete the injection of the medicament.
And 9, repeating the steps 2 to 8 until all the designed injection points complete the injection of the medicament.
The method for remediating soil groundwater using a dual fluid injection integrated system according to the present invention will be further described with reference to the following examples.
Example 1
A method for repairing soil underground water by adopting a double-fluid injection integrated system is particularly suitable for in-situ remediation of low-permeability stratum pollution in petrochemical sites.
The integrated system comprises an injection unit consisting of an injection pump 2, an air compressor 3, an injection rod 4, an injection ejector rod 5, a connecting cavity 6, a double-fluid rotary injection head 7 and a nozzle shell 8; a dispensing unit consisting of a medicament configuration groove 9 and a medicament storage groove 10; the auxiliary unit comprises an electric control cabinet 1, a rod box 11, a pressing device 12 and a skid-mounted platform 13. All systems are integrated on the skid platform 13.
When the dual-fluid injection integrated system is in an injection working state, the injection ejector rod 5, the injection rod 4, the connecting cavity 6 and the dual-fluid rotary injection head 7 are sequentially connected through threads. The nozzle shell 8 plays a role in protecting the double-fluid rotary injection head 7 when pressed in, and slides downwards to expose the double-fluid rotary injection head 7 before injection. All of the above components are depressed by the hold-down device 12 to the planned repair depth. The injection pump 2 and the air compressor 3 are connected to an injection mandril 5 through hoses. The medicament storage tank 10 is connected with the injection pump 2 through a drug delivery hose. The medicament is dispensed in the medicament dispensing groove 9 as required. Referring to fig. 1, the arrows indicate the direction of fluid transfer.
Stratum data obtained in advance detection and parameters such as injection volume, flow and pressure obtained through calculation are input through the injection control mechanism 15, parameter adjustment is achieved through the injection pump 2 and the executing mechanisms on the air compressor 3, accurate injection of all stratums and all depths is achieved, a plurality of in-situ injection problems caused by stratum heterogeneity are effectively solved, and potential secondary pollution caused by waste of chemicals, slurry bleeding and the like is avoided.
When the injection unit stem is depressed, the connecting chamber 6 and the nozzle housing 8 are in a closed state as shown in fig. 2. The connecting cavity 6 is provided with a gas-liquid outlet tapered end which is communicated with the double-fluid rotary injection head 7, so that the diameter of the gas-liquid pipe is reduced to be the same as the size of the inlet of the double-fluid rotary injection head 7. The lower end of the nozzle shell 8 is a conical surface, and the outer diameter of the nozzle shell is the same as that of the connecting cavity 6, so that the nozzle shell can be pressed downwards to drill into a soil layer. When pushing down, shower nozzle shell 8 receives the vertical ascending power in soil horizon below, upwards slides through draw runner 14, and is closed with being connected the chamber 6 contact for two fluid rotatory injection head 7 hides in shower nozzle shell 8 when drilling, prevents to bore the soil because receive the extrusion and contact with two fluid rotatory injection head 7, and avoids the rotatory nozzle 7-1 jam that probably leads to, damage or rotate unsmooth.
The section of the two-fluid rotary injection head 7 is shown in fig. 3, with the rotary nozzle 7-1 oriented tangentially to the center. Compressed gas is sprayed out through the rotary nozzle 7-1, the counterforce of the compressed gas drives the spray head to rotate, the repairing medicament is sprayed out through the nozzle in a rotating mode, the medicament is atomized and uniformly dispersed in a mechanical mode, smaller liquid drops are further formed under the influence of the compressed gas, and the repairing medicament is diffused in the low-permeability zone and the gas-coated zone.
The overall structure of the injection unit rod at the time of injection is shown in fig. 4. Through the whole lifting of the rod piece, the spray head outer shell 8 slides downwards along the sliding strips 14 under the action of gravity and is separated from the connecting cavity 6, and the sliding strips 14 on the two sides are suspended below the connecting cavity 6, so that the originally hidden double-fluid rotary injection head 7 in the spray head outer shell 8 is exposed, the injection repair work is allowed to be carried out, a small-section cavity is formed between the connecting cavity 6 and the spray head outer shell 8, and the phenomenon that the injection head 7 is not in contact with the soil body to cause rotation irregularity is avoided. An outer cavity inlet 5-1 and an inner cavity inlet 5-2 on the injection ejector rod 5 are respectively connected with the air compressor 3 and the injection pump 2 through hoses, so that compressed air and a repairing medicament respectively enter an outer tube and an inner tube of the injection ejector rod 5 and the injection rod 4 and flow down along the injection rod 4, and enter a double-fluid rotary injection head 7 with a small pipe diameter through a tapered end in a connecting cavity 6 to drive the rotary nozzle 7-1 to rotate and be sprayed out through the double-fluid rotary injection head. Wherein the number of injection rods 4 will be determined by the injection depth. The direction of rotation of the rotating nozzle 7-1 is perpendicular to the mouthpiece direction, and is horizontal in the case of a vertical press-in of the injection rod 4.
The electric control cabinet 1 is an outdoor extensible electric control cabinet and comprises a system power supply access and control module; the flow range of the injection pump 2 is 0-2m3H, the pressure range is 0-2.5 MPa; the flow of the air compressor 3 is 1-5m3Min, pressure 0.4-0.7 MPa; the injection rate of the medicament is generally controlled to be 10-35L/min; the diameter of the medicament configuration groove 9 is 1m, and the height is 1 m; the diameter of the medicament storage groove 10 is 1m, and the height is 1 m; the skid-mounted platform 13 is 6m multiplied by 2.4m in specification. Aiming at petrochemical site pollution, a typical restoration method is an in-situ chemical oxidation technology, so that a restoration medicament is preferably a Fenton reagent or activated persulfate solution, and a rod 4 is injected and injected simultaneouslyThe systems of the ejector rod 5, the connecting cavity 6, the two-fluid rotary injection head 7, the spray head shell 8 and the like which are contacted with the oxidative repair medicament need to use corrosion-resistant materials, and are preferably 316L type stainless steel.
Example 2
A method of remediating soil groundwater using a dual fluid injection integrated system, comprising:
and 9, repeating the steps 2 to 8 until all the designed injection points complete the injection of the medicament.
According to the method for repairing the soil and the underground water by adopting the double-fluid injection integrated system, the in-situ injection repair of the soil and the underground water can be completed by utilizing one set of integrated system, the simultaneous injection of the liquid medicament and the gas by the double fluids is achieved, the dispersion, diffusion and permeability of the medicament and the mixing capacity of the medicament and the underground pollutants are enhanced, the repair efficiency is improved, and the repair effect is improved. When the integrated skid-mounted injection rod is used, the integrated skid-mounted system is transferred to the position near an injection point, and the injection rod is directly pressed to the underground restoration depth by using a pressing device; the gas-liquid double-fluid injection adopts double-pipe rotary injection that an air compressor and an injection pump are connected with an injection rod, compressed air drives a spray head to rotate, and simultaneously gas is utilized to cut a soil body, so that atomization of liquid medicament is realized, the liquid medicament is smoothly dispersed in a low-permeability stratum and is fully mixed and contacted with pollutants, and the gas-coated double-fluid injection can be simultaneously suitable for pollution remediation of gas-coated soil, saturated soil and underground water.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A method for repairing soil groundwater by adopting a double-fluid injection integrated system is characterized in that the integrated system comprises an injection unit, a dispensing unit and an auxiliary unit;
the injection unit comprises an injection pump, an air compressor, an injection rod, an injection ejector rod, a connecting cavity, an injection head, a spray head shell and an injection control mechanism;
the dispensing unit comprises a medicament dispensing groove and a medicament storage groove;
the auxiliary unit comprises an electric control cabinet, a rod piece box, a pressing device and a skid-mounted platform;
the injection unit, the dispensing unit and the auxiliary unit are all integrated on the skid-mounted platform.
2. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 2, wherein the electric control cabinet, the rod box, the pressing device, the injection ejector rod, the air compressor, the injection pump, the chemical storage tank and the chemical preparation tank are sequentially arranged above the skid platform in a horizontal direction; the injection rod is vertically and downwards arranged on the skid-mounted platform, and the connecting cavity, the injection head and the nozzle shell are vertically arranged below the skid-mounted platform and connected with the injection rod; the injection ejector rod is vertically downwards connected with and communicated with the injection rod, the connecting cavity is arranged at the bottom end of the injection rod, the bottom of the connecting cavity is connected with the injection head, and the spray head shell is sleeved outside the injection head; the pressing device is fixed on the skid-mounted platform and used for mounting the injection rod.
3. A method for remediating soil groundwater using a dual fluid injection integrated system as claimed in claim 1, wherein the auxiliary unit further comprises cables and pipes; the pipeline comprises a medicine delivery hose and a compressed air hose; the cable is arranged among the electric control cabinet, the injection unit, the dispensing unit and the pressing device; the pressing device, the injection control mechanism, the injection pump and the air compressor are respectively connected with the electric control cabinet through cables; the medicine conveying hose and the compressed air hose are arranged between the injection unit and the dispensing unit; the medicament configuration groove, the medicament storage groove and the injection pump are sequentially connected through a medicament delivery hose, the outlet of the injection pump is connected with the injection ejector rod through the medicament delivery hose, and the outlet of the air compressor is connected with the injection ejector rod through a compressed air hose.
4. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 3, wherein in the auxiliary unit, a skid-mounted platform is integrated with a whole set of system, and universal wheels with self-locking structures are mounted at the bottoms of both sides; the pressing device comprises a hydraulic oil cylinder, an electromagnetic regulating valve, an electromagnetic reversing valve, a hydraulic one-way valve and a gear pump, and is used for pressing the injection rod; the rod box stores rods containing injection rods; and the electric control cabinet completes the integral power access and distribution of the system.
5. A method for remediation of soil groundwater according to claim 4 with a dual fluid injection integrated system wherein the system employs a 380V three phase power input.
6. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 3, wherein the dosing unit comprises a stirrer with liquid level scales in the chemical preparation tank, and a dosing metering mechanism on the top.
7. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 3, wherein the injection control mechanism comprises a pressure gauge, a flow meter, and an adjusting valve, and the injection control mechanism is connected to the injection pump and the air compressor and respectively adjusts the flow rate thereof for controlling.
8. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 7, wherein in the injection unit, the injection ejector rod is of a dual-layer tube structure, an outer cavity is formed between the outer tube and the inner tube, an inner cavity is formed in the inner tube, 2 inlet channels are formed on the injection ejector rod and respectively connected to the air compressor and the injection pump, and the lower portion of the injection ejector rod is connected to the injection rod through a thread; the injection rod is composed of a plurality of connected rods, each injection rod is of a double-layer pipe structure, an outer cavity is formed between the outer layer pipe and the inner layer pipe, an inner cavity is arranged in the inner layer pipe and is respectively communicated with the outer cavity and the inner cavity of the injection ejector rod, the inner cavity is connected with the injection pump through the injection ejector rod, and the outer cavity is connected with the air compressor; the two injection rods are fixedly connected through threads, and the injection rod at the lowest end is connected with the connecting cavity; the top end of the connecting cavity is connected with the injection rod, and the bottom end of the connecting cavity is connected with the injection head.
9. The method for remediating soil groundwater using a dual fluid injection integrated system as defined in claim 8, wherein the injection head is a compressed air driven dual fluid rotary nozzle connected to the connection chamber by a screw thread; the injection head is covered and protected by the nozzle shell when pressed into a soil layer, the top of the nozzle shell is conical, and the rear part of the nozzle shell is cylindrical and is connected with the connecting cavity through the sliding strip.
10. The method for remediating soil groundwater using a dual fluid injection integrated system as claimed in any one of claims 1 to 9, wherein the method comprises:
step 1, hoisting by using a hoisting device and placing a skid-mounted platform to a repair site;
step 2, moving the skid-mounted platform to an injection point, aligning the pressing device with the injection point, and locking a self-locking structure of the universal wheel under the skid-mounted platform; turning on a power supply, and starting a stirrer in the medicament preparation groove to prepare the medicament;
step 3, assembling the double-fluid rotary injection head, the connecting cavity, the nozzle shell and the injection rod and fixing the double-fluid rotary injection head, the connecting cavity, the nozzle shell and the injection rod to a pressing device; starting a pressing device to start pressing; after the first injection rod is pressed downwards, the fixing is released, the second injection rod is connected and fixed on the pressing device, and the second injection rod is pressed downwards again;
step 4, repeating the step 3 until the actual pressing depth exceeds the designed maximum injection depth by 0.5m, fixing the injection rod, and assembling the injection ejector rod on the top of the uppermost injection rod;
step 5, lifting the injection rod integrally to enable the double-fluid rotary injection head to reach the designed injection depth, and enabling the spray head shell to slide downwards along the sliding strip to expose the injection head;
step 6, connecting an injection pump and an air compressor with an injection ejector rod; the air compressor is connected to the outer cavity of the injection ejector rod, and the injection pump is connected to the inner cavity of the injection ejector rod;
step 7, starting the injection unit; the injection pump and the air compressor respectively inject the prepared liquid medicament and compressed air into the inner cavity and the outer cavity of the injection ejector rod and the injection rod, and the liquid medicament and the compressed air enter the connecting cavity along the injection rod; the medicament and compressed air enter the double-fluid rotary injection head from the connecting cavity, and the compressed air drives the rotary nozzle to rotate, so that the medicament is atomized and then is sprayed out;
step 8, lifting the injection rod to the next injection depth, and repeating the steps 6 to 8 until all the designed injection depths of the injection points complete the injection of the medicament;
and 9, repeating the steps 2 to 8 until all the designed injection points complete the injection of the medicament.
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