Vapor extraction in-situ remediation equipment and remediation method for organic contaminated soil
By designing an in-situ remediation device for organic polluted soil using vapor phase extraction, and utilizing high-temperature steam injection and activated carbon fiber purification, the device solves the problems of low remediation efficiency and insufficient equipment versatility in existing technologies, achieving efficient and low-cost soil remediation results.
Patent Information
- Application Number
- CN202511835442.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-02-24
AI Technical Summary
In existing technologies, in-situ thermal desorption methods have poor desorption effects on semi-volatile organic pollutants, and large-scale fixed equipment lacks versatility and flexibility, resulting in long treatment times, high energy consumption, and difficulty in effectively remediating organically contaminated soil.
An in-situ remediation device for organic polluted soil by vapor phase extraction was designed, including a steam injection component, an extraction component, and a purification component. The device uses a high-temperature steam injection pipe and a negative pressure pump to extract gas, combined with activated carbon fiber purification. The steam is diffused through a drive motor and a gear system, and the activated carbon fiber adsorbs and mechanically squeezes the organic pollutant gas for desorption.
It improves the efficiency and flexibility of remediation of organically contaminated soil, reduces remediation costs, achieves efficient desorption and purification of organic pollutants, and features a simple structure and high operational reliability.
Smart Images
Figure CN121551376A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of soil remediation technology, specifically to a vapor phase extraction in-situ remediation device and method for organically contaminated soil. Background Technology
[0002] Organic pollutants are among the most widespread pollutants in contaminated sites. They can adsorb onto soil particles and continuously release into soil and groundwater, causing adverse effects on human health and the ecological environment. Soil thermal desorption remediation technology is one of the most effective methods for treating these pollutants. This technology uses indirect or direct heating methods to cause volatile petroleum hydrocarbons, polycyclic aromatic hydrocarbons, and other pollutants in the soil to volatilize into the gas phase, which is then collected and processed in the next stage. However, semi-volatile organic pollutants are not easily desorbed, and thermal desorption technology is less effective at treating them.
[0003] In existing technologies, commonly used in-situ thermal desorption methods heat the soil using thermal resistors or steam. Soil that is far from the heat source is difficult to reach the required temperature, which has a certain impact on removal time and efficiency. It has disadvantages such as long processing time and high energy consumption, and its desorption effect on semi-volatile organic pollutants in the soil is also poor. Moreover, existing soil vapor phase extraction technologies and equipment are basically large-scale fixed equipment. Some large organic contaminated sites even require customized extraction equipment, which greatly limits the versatility and flexibility, and also affects the scope of soil remediation. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention provides a vapor phase extraction in-situ remediation device and method for organically contaminated soil.
[0005] The technical solution of the present invention is as follows: an in-situ remediation device for organic polluted soil by vapor phase extraction, comprising a remediation platform and a steam injection component, an extraction component, and a purification component disposed on the remediation platform; the remediation platform includes a carrier plate and a well pipe disposed on the bottom surface of the carrier plate; a plurality of micropores are evenly distributed on the well pipe; The steam injection assembly includes a steam generator mounted on the upper surface of the carrier plate and several injection pipe components evenly distributed from top to bottom inside the well pipe; the injection pipe components consist of several steam injection pipes distributed in a radiating pattern inside the well pipe, each steam injection pipe being connected to the steam generator via a conduit; and the end of each steam injection pipe near the inner wall of the well pipe penetrates the well pipe. The extraction assembly includes a negative pressure pump and an extraction pump mounted on the upper surface of the carrier plate; the output end of the negative pressure pump is connected to a negative pressure pipe that penetrates the carrier plate and communicates with the inside of the well pipe; the input end of the extraction pump is connected to an extraction pipe that penetrates the carrier plate and communicates with the inside of the well pipe. The purification component includes an outer shell disposed on the upper surface of the carrier plate and activated carbon fibers disposed inside the outer shell; an air inlet and an air outlet are respectively disposed at both ends of the outer shell; the air inlet is connected to the output end of the extraction pump.
[0006] Furthermore, the steam injection assembly also includes a drive component; the drive component includes a drive motor mounted on the upper surface of the carrier plate and several drive shafts equidistantly distributed inside the well pipe; a limit frame is provided inside the well pipe and below each injection pipe component, and each steam injection pipe is slidably engaged with the limit frame at its corresponding position via a limit slider, and a toothed groove is provided on the outer wall of each steam injection pipe; a drive gear is connected to the output end of the drive motor; each drive shaft passes through the limit frame and is rotatably engaged with the bottom of the well pipe; a first gear is provided at the top of each drive shaft and meshes with the drive gear; a second gear is sleeved on each drive shaft and meshes with the toothed groove on the corresponding steam injection pipe; Explanation: The drive motor drives the drive gear to rotate. The meshing of the first gear and the drive gear causes each drive shaft to rotate on the limit frame. The meshing of the second gear and the tooth groove causes each steam injection pipe to penetrate the well pipe and be inserted into the organic contaminated soil, which helps to increase the diffusion range of high-temperature steam.
[0007] Furthermore, each steam injection pipe has an inner tube that is slidably engaged inside it, and the inner tube is connected to the steam generator through a conduit; several injection holes are provided through the outer wall of the steam injection pipe, and each injection hole has a sliding baffle that is slidably engaged inside it and connected to the outer wall of the inner tube. Note: During the insertion of the steam injection pipe into the organically contaminated soil, the sliding baffle blocks the injection hole to prevent soil particles from entering the steam injection pipe, which helps improve the reliability of the remediation equipment. When the steam injection pipe stops moving, the drive motor is reversed to make the sliding baffle disengage from the corresponding injection hole.
[0008] Furthermore, each steam injection pipe is equipped with a soil-breaking tip at one end near the outer wall of the well pipe; Note: By setting a soil-breaking tip, the resistance when the steam injection pipe enters the organically contaminated soil can be reduced, which helps to reduce the power loss of the drive motor.
[0009] Furthermore, the well casing is hollow inside, and cleaning brush sleeves are slidably engaged on both sides of each limiting frame inside the well casing. Each cleaning brush sleeve is connected to the others by a tie rod. A cleaning rod penetrating the carrier plate is provided on the cleaning brush sleeve at the uppermost end inside the well casing. A first electric push rod connected to the cleaning rod is provided on the upper surface of the carrier plate. Explanation: The first electric push rod is used to push the cleaning rod to move up and down inside the well pipe. At this time, each cleaning brush sleeve moves along the inner wall of the well pipe under the connection of the pull rod to clean the micropores on the well pipe.
[0010] Furthermore, a water collection tank and a dewatering pump are provided on the upper surface of the carrier plate. The input end of the dewatering pump is connected to a dewatering pipe that penetrates the carrier plate, and the output end of the dewatering pump is connected to a water inlet pipe that communicates with the water collection tank. Note: The dewatering pump pumps the sewage deposited at the bottom of the well pipe into the collection tank through the dewatering pipe, so as to avoid the sewage level inside the well pipe being too high and affecting the extraction efficiency of organic pollutants.
[0011] Furthermore, several barrier mesh plates are evenly distributed inside the outer shell, and activated carbon fibers are placed between two adjacent barrier mesh plates; a dehydration plate located at the top of each activated carbon fiber is movably engaged inside the outer shell; a squeezing rod penetrating the outer shell is provided at the top of each dehydration plate, and a return spring abutting against the outer wall of the outer shell is sleeved on each squeezing rod; a sliding frame is provided at the top of the outer shell; a second electric push rod is slidably engaged on the sliding frame via a sliding seat; and a liquid collection box communicating with the interior of the outer shell is provided at the bottom of the outer shell. Explanation: When the activated carbon fiber is overloaded with organic pollutants, affecting its adsorption effect, the second electric push rod is moved to the top of a certain squeezing rod via the slide block. The second electric push rod then pushes the corresponding squeezing rod downward along the inner wall of the outer shell. At this time, the dehydration plate squeezes the corresponding activated carbon fiber, and the pollutants released from the activated carbon fiber enter the collection box for collection, thus ensuring the high efficiency of the activated carbon fiber.
[0012] Furthermore, a three-way valve is connected to the air outlet, and a return pipe is provided between the three-way valve and the air inlet; Note: When the concentration of organic pollutant gas discharged from the inside of the outer casing is too high, the organic pollutant gas is circulated back into the outer casing for purification using a return pipe, which helps to improve the purification effect of the organic pollutant gas.
[0013] This invention also provides a method for in-situ remediation of organic polluted soil by vapor phase extraction, based on the above-mentioned device for in-situ remediation of organic polluted soil by vapor phase extraction, comprising the following steps: S1. Excavate remediation wells in organically contaminated soil areas, then insert well pipes into the remediation wells, and finally connect the carrier plate to the top of the well pipes. S2. The drive motor drives the drive gear to rotate. The meshing of the first gear and the drive gear causes each drive shaft to rotate on the limit frame. The meshing of the second gear and the tooth groove causes each steam injection pipe to penetrate the well pipe and be inserted into the organically contaminated soil. When the steam injection pipe stops moving, the drive motor is controlled to reverse, causing the sliding baffle to disengage from the corresponding injection hole. The steam generator injects high-temperature steam into the interior of each inner pipe through the conduit. The high-temperature steam finally enters the organically contaminated soil through the inner pipe. The temperature of the high-temperature steam is 120~150℃. S3. Use a negative pressure pump to draw the pressure inside the well casing to 20~30kPa, and then use an extraction pump to extract the organic pollutant gas inside the well casing through the extraction pipe. S4. The organic pollutant gas discharged by the extraction pump enters the interior of the outer casing through the air inlet. The organic pollutant gas is adsorbed and purified by activated carbon fiber. The purified organic pollutant gas is discharged through the air outlet.
[0014] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects: First, the remediation equipment of the present invention has a reasonable and compact structural design, which solves the technical problems of traditional soil vapor phase extraction equipment being large in size, difficult to move, and not flexible enough; at the same time, it uses high-temperature steam to heat the organic polluted soil, which increases the flow rate of VOCs in the soil, thereby improving the remediation effect of organic polluted soil. Secondly, the remediation equipment of the present invention utilizes a steam injection pipe that can move inside the well pipe to inject high-temperature steam into organically contaminated soil, which is beneficial to increase the diffusion range of high-temperature steam in organically contaminated soil, improve the remediation efficiency of organically contaminated soil, and reduce the remediation cost of organically contaminated soil. Third, this invention utilizes activated carbon fiber adsorption to remediate and purify organic pollutant gases, while simultaneously using mechanical extrusion to achieve desorption of the activated carbon fiber. It is safe, reliable, and has low operating costs. Desorption can be performed directly during adsorption, and the equipment structure is simple. Moreover, the activated carbon fiber can be stretched and restored for reuse after extrusion and desorption, and the residual liquid from desorption and extrusion can be recycled, making it energy-saving and environmentally friendly. Attached Figure Description
[0015] Figure 1 This is a longitudinal sectional view of the repair device of the present invention; Figure 2 This is a top view of the repair device of the present invention; Figure 3 This is a diagram showing the distribution of the steam injection pipe inside the well casing according to the present invention; Figure 4 This is a schematic diagram of the connection between the inner tube and the steam injection tube of the present invention; Figure 5 This is the present invention. Figure 4 A magnified view of a portion of point A in the middle; Figure 6 This is a schematic diagram of the connection between the steam injection pipe and the carrier plate of the present invention; Figure 7 This is a schematic diagram of the internal structure of the outer shell of the present invention; Figure 8 This is a schematic diagram of the connection between the return pipe and the outer casing of the present invention; Figure 9 This is a schematic diagram of the connection between the cleaning brush sleeve and the well pipe of the present invention; Among them, 1-repair platform, 10-carrier plate, 11-well pipe, 12-limiting frame, 2-steam injection assembly, 20-steam generator, 21-injection pipe assembly, 210-steam injection pipe, 2100-limiting slider, 2101-tooth groove, 2102-injection hole, 2103-soil breaking tip, 211-conduit, 22-drive assembly, 220-drive motor, 2200-drive gear, 221-drive shaft, 2210-first gear, 2211-second gear, 23-inner pipe, 230-sliding baffle, 3-extraction assembly, 30-negative pressure pump, 300 - Negative pressure pipe, 31- Extraction pump, 310- Extraction pipe, 4- Purification component, 40- Outer shell, 400- Air inlet, 401- Air outlet, 41- Activated carbon fiber, 42- Barrier mesh, 43- Dehydration plate, 430- Squeezing rod, 431- Reset spring, 44- Sliding frame, 45- Second electric push rod, 450- Slide seat, 46- Liquid collection box, 47- Three-way valve, 470- Return pipe, 5- Cleaning brush sleeve, 50- Pull rod, 51- Cleaning rod, 52- First electric push rod, 6- Water collection tank, 60- Downflow pump, 600- Downflow pipe, 601- Inlet pipe. Detailed Implementation
[0016] Example 1: As Figure 1 The device shown is an in-situ remediation device for organic contaminated soil by vapor phase extraction, including a remediation platform 1 and a steam injection component 2, an extraction component 3, and a purification component 4 disposed on the remediation platform 1; the remediation platform 1 includes a carrier plate 10 and a well pipe 11 disposed on the bottom surface of the carrier plate 10; a number of micropores (not shown in the figure) are evenly distributed on the well pipe 11. like Figure 1 , Figure 2 , Figure 3 As shown, the steam injection assembly 2 includes a steam generator 20 disposed on the upper end face of the carrier plate 10 and three injection pipe components 21 distributed equidistantly from top to bottom inside the well pipe 11; the injection pipe component 21 is composed of four steam injection pipes 210 distributed in a radiating pattern inside the well pipe 11, and each steam injection pipe 210 is connected to the steam generator 20 through a conduit 211; and the end of each steam injection pipe 210 near the inner wall of the well pipe 11 penetrates the well pipe 11. like Figure 1 , Figure 2 As shown, the extraction assembly 3 includes a negative pressure pump 30 and an extraction pump 31 disposed on the upper end face of the carrier plate 10; the output end of the negative pressure pump 30 is connected to a negative pressure pipe 300 that penetrates the carrier plate 10 and communicates with the inside of the well pipe 11; the input end of the extraction pump 31 is connected to an extraction pipe 310 that penetrates the carrier plate 10 and communicates with the inside of the well pipe 11. like Figure 2 , Figure 7As shown, the purification component 4 includes an outer shell 40 disposed on the upper end face of the carrier plate 10 and activated carbon fiber 41 disposed inside the outer shell 40; an air inlet 400 and an air outlet 401 are respectively disposed at both ends of the outer shell 40; the air inlet 400 is connected to the output end of the extraction pump 31.
[0017] Example 2: This example describes a method for in-situ remediation of organic polluted soil by vapor phase extraction, based on the equipment for in-situ remediation of organic polluted soil by vapor phase extraction in Example 1, including the following steps: S1. Excavate a remediation well in the organic contaminated soil area, then place the well pipe 11 into the remediation well, and finally connect the carrier plate 10 to the top of the well pipe 11. S2. High-temperature steam is injected into each inner tube 23 through conduit 211 using steam generator 20. The high-temperature steam eventually enters the organically contaminated soil through the inner tube 23. The temperature of the high-temperature steam is 120℃. S3. Use negative pressure pump 30 to pump the internal pressure of well pipe 11 to 20 kPa, and then use extraction pump 31 to extract the organic pollutant gas inside well pipe 11 through extraction pipe 310. S4. The organic pollutant gas discharged by the extraction pump 31 enters the interior of the outer casing 40 through the air inlet 400. The organic pollutant gas is adsorbed and purified by activated carbon fiber 41. The purified organic pollutant gas is discharged through the air outlet 401.
[0018] Example 3: The difference between this example and Example 1 is that there are 5 injection pipe components 21; the injection pipe component 21 is composed of 6 steam injection pipes 210.
[0019] Example 4: This example differs from Example 1 in that, as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the steam injection assembly 2 also includes a drive component 22; the drive component 22 includes a drive motor 220 disposed on the upper end face of the carrier plate 10 and four drive shafts 221 distributed inside the well pipe 11; a limit frame 12 is provided inside the well pipe 11 and below each injection pipe component 21, and each steam injection pipe 210 is slidably engaged with the limit frame 12 at the corresponding position by a limit slider 2100, and a toothed groove 2101 is provided on the outer side wall of each steam injection pipe 210; the output end of the drive motor 220 is connected to a drive gear 2200; each drive shaft 221 passes through the limit frame 12 and is rotatably engaged with the bottom of the well pipe 11; each drive shaft Each rod 221 has a first gear 2210 at its top end that meshes with the drive gear 2200; each drive shaft rod 221 has a second gear 2211 that meshes with the toothed groove 2101 on the steam injection pipe 210 at the corresponding position; each steam injection pipe 210 has an inner tube 23 slidably engaged inside, and the inner tube 23 is connected to the steam generator 20 through the conduit 211; several injection holes 2102 are provided through the outer wall of the steam injection pipe 210, and each injection hole 2102 has a sliding baffle 230 slidably engaged inside, which is connected to the outer wall of the inner tube 23; each steam injection pipe 210 has a soil-breaking tip 2103 at one end near the outer wall of the well pipe 11.
[0020] Example 5: This example describes a vapor phase extraction in-situ remediation method for organic polluted soil, based on the vapor phase extraction in-situ remediation device for organic polluted soil described in Example 4. The difference from Example 3 is that: In step S2, the drive motor 220 drives the drive gear 2200 to rotate. The meshing of the first gear 2210 and the drive gear 2200 causes each drive shaft 221 to rotate on the limit frame 12. The meshing of the second gear 2211 and the tooth groove 2101 causes each steam injection pipe 210 to penetrate the well pipe 11 and be inserted into the organically contaminated soil. When the steam injection pipe 210 stops moving, the drive motor 220 is controlled to reverse, causing the sliding baffle 230 to disengage from the corresponding injection hole 2102. The temperature of the high-temperature steam is 150°C. In step S3, the internal pressure of the well casing 11 is pumped to 30 kPa using the negative pressure pump 30.
[0021] Example 6: This example differs from Example 4 in that, as Figure 2 , Figure 9 As shown, the well pipe 11 is hollow inside, and cleaning brush sleeves 5 are slidably engaged inside the well pipe 11 and on both sides of each limiting frame 12. Each cleaning brush sleeve 5 is connected to the others by a pull rod 50. A cleaning rod 51 that penetrates the carrier plate 10 is provided on the cleaning brush sleeve 5 at the uppermost end inside the well pipe 11. A first electric push rod 52 connected to the cleaning rod 51 is provided on the upper surface of the carrier plate 10.
[0022] Example 7: This example describes a vapor phase extraction in-situ remediation method for organic polluted soil, based on the vapor phase extraction in-situ remediation device for organic polluted soil described in Example 6. The difference from Example 5 is that it further includes step S5. S5. The first electric push rod 52 is used to push the cleaning rod 51 to move up and down inside the well pipe 11. At this time, each cleaning brush sleeve 5 moves along the inner wall of the well pipe 11 under the connection of the pull rod 50 to clean the micropores on the well pipe 11.
[0023] Example 8: This example differs from Example 6 in that, as Figure 1 , Figure 2 As shown, a water collection tank 6 and a dewatering pump 60 are provided on the upper surface of the carrier plate 10. The input end of the dewatering pump 60 is connected to a dewatering pipe 600 that passes through the carrier plate 10, and the output end of the dewatering pump 60 is connected to an inlet pipe 601 that communicates with the water collection tank 6. The dewatering pump 60 pumps the sewage deposited at the bottom of the well pipe 11 into the water collection tank 6 through the dewatering pipe 600, so as to avoid the sewage level inside the well pipe 11 being too high and affecting the extraction efficiency of organic pollutants.
[0024] Example 9: This example differs from Example 8 in that, as Figure 7 , Figure 8 As shown, three barrier mesh plates 42 are evenly distributed inside the outer shell 40, and activated carbon fibers 41 are disposed between two adjacent barrier mesh plates 42; a dehydration plate 43 located at the top of each activated carbon fiber 41 is movably engaged inside the outer shell 40; each dehydration plate 43 is provided with a squeezing rod 430 penetrating the outer shell 40 at its top, and each squeezing rod 430 is fitted with a return spring 431 that abuts against the outer wall of the outer shell 40; a sliding frame 44 is provided at the top of the outer shell 40; a second electric push rod 45 is slidably engaged on the sliding frame 44 through a sliding seat 450; a liquid collection box 46 communicating with the inside of the outer shell 40 is provided at the bottom of the outer shell 40; a three-way valve 47 is connected to the air outlet 401, and a return pipe 470 is provided between the three-way valve 47 and the air inlet 400.
[0025] Example 10: This example describes a vapor phase extraction in-situ remediation method for organic polluted soil, based on the vapor phase extraction in-situ remediation device for organic polluted soil described in Example 9. The difference from Example 7 is that: In step S4, when the adsorption of organic pollutants inside the activated carbon fiber 41 is too high and affects its adsorption effect, the second electric push rod 45 is moved to the top of a certain squeezing rod 430 by the slide 450. The second electric push rod 45 pushes the corresponding squeezing rod 430 to move downward along the inner wall of the outer shell 40. At this time, the dehydration plate 43 squeezes the corresponding activated carbon fiber 41, and the pollutants released from the activated carbon fiber 41 enter the collection box 46 for collection. When the concentration of organic pollutant gas discharged from the outer shell 40 is too high, the organic pollutant gas is circulated into the outer shell 40 for purification treatment by the return pipe 470.
[0026] It should be noted that the steam generator 20, drive motor 220, negative pressure pump 30, extraction pump 31, activated carbon fiber 41, second electric push rod 45, three-way valve 47 and first electric push rod 52 used in this invention all adopt existing technology and are not specifically limited here. Those skilled in the art can select the corresponding products according to actual needs.
[0027] Test case The remediation equipment described in Examples 1, 4, 6, 8, and 9 of this invention were used to remediate organic contaminated sites. After remediation, the concentrations of volatile organic compounds in the soil and COD in the contaminated groundwater were measured, and the results are shown in Table 1. Table 1. Concentrations of volatile organic compounds in soil and COD concentration in contaminated groundwater after remediation of organically contaminated sites in each embodiment;
[0028] As shown in Table 1, after remediation of organic contaminated sites using the remediation equipment of Examples 1, 4, 6, 8, and 9 of this invention, the concentrations of volatile organic compounds in the soil and COD concentrations in the contaminated groundwater all meet the requirements. Among them, the remediation equipment of Example 9 achieves a volatile organic compound concentration of 19 μg / m³ in the soil and a COD concentration of 43 mg / L in the contaminated groundwater, with all data being superior to those of the other examples. Example 9 is the optimal example.
Claims
1. A vapor-phase extraction in-situ remediation device for organically contaminated soil, characterized in that, It includes a repair platform (1) and a steam injection assembly (2), an extraction assembly (3), and a purification assembly (4) disposed on the repair platform (1); the repair platform (1) includes a carrier plate (10) and a well pipe (11) disposed on the bottom surface of the carrier plate (10); the well pipe (11) has a number of micropores evenly distributed on it; The steam injection assembly (2) includes a steam generator (20) disposed on the upper end face of the carrier plate (10) and several injection pipe components (21) distributed equidistantly from top to bottom inside the well pipe (11); the injection pipe component (21) is composed of several steam injection pipes (210) distributed in a radiating pattern inside the well pipe (11), and each of the steam injection pipes (210) is connected to the steam generator (20) through a conduit (211); and the end of each steam injection pipe (210) near the inner wall of the well pipe (11) penetrates the well pipe (11). The extraction assembly (3) includes a negative pressure pump (30) and an extraction pump (31) disposed on the upper end face of the carrier plate (10); the output end of the negative pressure pump (30) is connected to a negative pressure pipe (300) that penetrates the carrier plate (10) and communicates with the inside of the well pipe (11); the input end of the extraction pump (31) is connected to an extraction pipe (310) that penetrates the carrier plate (10) and communicates with the inside of the well pipe (11). The purification component (4) includes an outer shell (40) disposed on the upper end face of the carrier plate (10) and activated carbon fiber (41) disposed inside the outer shell (40); an air inlet (400) and an air outlet (401) are respectively disposed at both ends of the outer shell (40); the air inlet (400) is connected to the output end of the extraction pump (31).
2. The in-situ remediation equipment for organic polluted soil by vapor phase extraction according to claim 1, characterized in that, The steam injection assembly (2) further includes a drive component (22); the drive component (22) includes a drive motor (220) disposed on the upper end face of the carrier plate (10) and several drive shafts (221) equidistantly distributed inside the well pipe (11); a limit frame (12) is provided inside the well pipe (11) and below each of the injection pipe components (21), and each of the steam injection pipes (210) is slidably engaged with the limit frame (12) at the corresponding position by a limit slider (2100), and each of the steam injection pipes (210) has a limit frame (12) on its outer side wall. The drive motor (220) is provided with a toothed groove (2101); the output end of the drive motor (220) is connected to a drive gear (2200); each drive shaft (221) passes through the limit frame (12) and is rotatably engaged with the bottom of the well pipe (11); each drive shaft (221) is provided with a first gear (2210) that meshes with the drive gear (2200) at its top end; each drive shaft (221) is provided with a second gear (2211) that meshes with the toothed groove (2101) on the steam injection pipe (210) at the corresponding position.
3. The in-situ remediation equipment for organic polluted soil by vapor phase extraction according to claim 2, characterized in that, Each of the steam injection pipes (210) has an inner tube (23) slidably connected inside, and the inner tube (23) is connected to the steam generator (20) through a conduit (211); a number of injection holes (2102) are provided through the outer wall of the steam injection pipe (210), and each of the injection holes (2102) has a sliding baffle (230) slidably connected to the outer wall of the inner tube (23).
4. The in-situ remediation equipment for organic polluted soil by vapor phase extraction according to claim 3, characterized in that, Each of the steam injection pipes (210) is provided with a soil-breaking tip (2103) at one end near the outer wall of the well pipe (11).
5. The in-situ remediation equipment for organic polluted soil by vapor phase extraction according to claim 2, characterized in that, The well pipe (11) is hollow inside, and a cleaning brush sleeve (5) is slidably engaged inside the well pipe (11) and on both sides of each of the limiting frames (12). Each of the cleaning brush sleeves (5) is connected to each other by a pull rod (50). A cleaning rod (51) penetrating the carrier plate (10) is provided on the cleaning brush sleeve (5) at the uppermost end inside the well pipe (11). A first electric push rod (52) connected to the cleaning rod (51) is provided on the upper end face of the carrier plate (10).
6. The in-situ remediation equipment for organic polluted soil by vapor phase extraction according to claim 1, characterized in that, The upper surface of the carrier plate (10) is provided with a water collection tank (6) and a water pump (60). The input end of the water pump (60) is connected to a water pipe (600) that passes through the carrier plate (10), and the output end of the water pump (60) is connected to an inlet pipe (601) that communicates with the water collection tank (6).
7. The in-situ remediation equipment for organic contaminated soil by vapor phase extraction according to claim 1, characterized in that, The outer shell (40) has several barrier mesh plates (42) evenly distributed inside, and the activated carbon fiber (41) is disposed between two adjacent barrier mesh plates (42); the outer shell (40) is movably connected to the top of each activated carbon fiber (41) and a dehydration plate (43) is located at the top of each dehydration plate (43); each dehydration plate (43) is provided with a squeezing rod (430) penetrating the outer shell (40), and each squeezing rod (430) is fitted with a return spring (431) that abuts against the outer wall of the outer shell (40); a sliding frame (44) is provided at the top of the outer shell (40); a second electric push rod (45) is slidably connected to the sliding frame (44) through a sliding seat (450); a liquid collection box (46) communicating with the inside of the outer shell (40) is provided at the bottom of the outer shell (40).
8. The in-situ remediation equipment for organic contaminated soil by vapor phase extraction according to claim 7, characterized in that, A three-way valve (47) is connected to the air outlet (401), and a return pipe (470) is provided between the three-way valve (47) and the air inlet (400).
9. A method for in-situ remediation of organically contaminated soil by vapor phase extraction, based on the in-situ remediation equipment for organically contaminated soil by vapor phase extraction as described in claim 3, characterized in that, Includes the following steps: S1. Excavate a remediation well in an organically contaminated soil plot, then place the well pipe (11) into the remediation well, and finally connect the carrier plate (10) to the top of the well pipe (11). S2. The drive motor (220) drives the drive gear (2200) to rotate. The meshing action of the first gear (2210) and the drive gear (2200) causes each drive shaft (221) to rotate on the limit frame (12). The meshing action of the second gear (2211) and the tooth groove (2101) causes each steam injection pipe (210) to penetrate the well pipe (11) and be inserted into the organic contaminated soil. When the steam injection pipe (210) stops moving, the drive motor (220) is controlled to reverse, so that the sliding baffle (230) disengages from the corresponding injection hole (2102). The steam generator (20) injects high-temperature steam into each inner tube (23) through the conduit (211). The high-temperature steam finally enters the organic contaminated soil through the inner tube (23). The temperature of the high-temperature steam is 120~150℃. S3. Use a negative pressure pump (30) to pump the internal pressure of the well pipe (11) to 20~30 kPa, and then use an extraction pump (31) to extract the organic pollutant gas inside the well pipe (11) through the extraction pipe (310); S4. The organic pollutant gas discharged by the extraction pump (31) enters the interior of the outer shell (40) through the air inlet (400), and the organic pollutant gas is adsorbed and purified by activated carbon fiber (41). The purified organic pollutant gas is discharged through the air outlet (401).