Equipment for repairing volatile organic pollutant soil by steam extraction

Abstract

The invention relates to the technical field of soil pollution remediation, in particular to equipment for remediating volatile organic pollutant soil through steam extraction, which comprises a remediation box and a high-pressure steam generation unit, partition plates are arranged in the remediation box, a rotating shaft is rotatably mounted in every two adjacent partition plates, blades are arranged on the peripheral sides of the rotating shafts, and the blades are connected with the high-pressure steam generation unit. The high-pressure steam generating unit comprises a high-pressure steam tank, a steam outlet channel is formed in the high-pressure steam tank, the input end of a first sealing tank is connected with a backflow channel of the high-pressure steam tank, an impeller is rotationally installed in the first sealing tank and coaxially connected with a driving wheel located outside the first sealing tank, and the driving wheel is in transmission connection with a rotating shaft; a three-way valve is arranged at the joint of the steam outlet channel and the first sealing tank, the output end of the three-way valve communicates with the input end of the first sealing tank and the input end of the second sealing tank, according to the technical scheme, steam is guided through the three-way valve, the blades rotate according to needs instead of continuously rotating, and disturbance to the environment in the repairing box is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soil pollution remediation, and in particular to a device for remediating soil containing volatile organic pollutants by utilizing steam extraction. Background Art

[0002] Soil vapor extraction (SVE) is a soil remediation technology used to remove volatile organic pollutants (VOPs). It can be divided into in-situ and ex-situ remediation. This process involves introducing clean air into the contaminated soil to create a driving force. The process then utilizes the concentration gradient between the soil's solid, liquid, and gas phases to convert these pollutants into gaseous form and remove them from the soil under reduced pressure. Ex-situ SVE remediation involves excavating the contaminated soil, transporting it to a designated treatment site, and then heating and separating the pollutants using steam treatment equipment such as steam stripping towers and stirred bed reactors.

[0003] Chinese patent CN111482451B discloses an energy-saving steam thermal desorption soil remediation box, including a remediation box, wherein the inner rotation of the remediation box is connected to a hollow rotating shaft, the side wall of the hollow rotating shaft is provided with a stirring blade, the side wall of the hollow rotating shaft is provided with a one-way through hole, the side wall of the remediation box is connected to a feed pipe and an air intake pipe from top to bottom, the side wall of the remediation box is provided with a mechanism groove connected to the air intake pipe, and a steam turbine coaxially fixedly connected to the hollow rotating shaft is provided in the mechanism groove.

[0004] This equipment drives the turbine to rotate by transmitting the kinetic energy of hot steam, and then the hollow rotating shaft arranged coaxially with the turbine rotates, so that the stirring blades rotate accordingly. The soil and hot steam can be fully stirred and mixed without the need for motor drive. However, the rotating shaft with the stirring blades is located in the repair box, which greatly affects the loading and unloading of the soil. The stirring blades rotate continuously during soil repair, and the kinetic energy required is large. The energy consumed by the steam to drive the turbine to rotate is large, resulting in a reduction in the subsequent extraction effect. In addition, the continuously rotating stirring blades make the internal environment of the repair box unstable, and it is impossible to ensure the effective mixing of steam and pollutants in the soil. Summary of the Invention

[0005] In response to the above-mentioned technical deficiencies, the purpose of the present invention is to provide a device for remediating soil containing volatile organic pollutants using steam extraction, comprising a remediation box and a high-pressure steam generating unit, wherein the remediation box is provided with several vertical partition plates extending along the length direction of the remediation box, and a rotating shaft is rotatably installed in two adjacent partition plates, and blades are provided on the circumference of the rotating shaft; an air cavity is provided in the partition plate, and air outlet holes communicating with the air cavity are provided on both sides of the partition plate, the high-pressure steam generating unit comprises a high-pressure steam tank, a steam outlet channel is provided on the high-pressure steam tank, the steam outlet channel is connected to a first sealed tank, the input end of the first sealed tank is connected to the reflux channel of the high-pressure steam tank, an impeller is rotatably installed in the first sealed tank, steam enters the first sealed tank to drive the impeller to rotate, the impeller is coaxially connected to a drive wheel located outside the first sealed tank, and the drive wheel is connected to the rotating shaft; a three-way valve is provided at the connection between the steam outlet channel and the first sealed tank, the output end of the three-way valve is respectively connected to the input end of the first sealed tank and the second sealed tank, and the second sealed tank is provided with several steam branch pipes communicating with each air cavity.

[0006] Preferably, the axial direction of the rotating shaft is parallel to the length direction of the partition plate, and a plurality of rotating seats coaxially connected to the rotating shaft are rotatably installed on the repair box. Each rotating seat is located at one end outside the repair box and is connected to the first driven wheel rotatably installed on the repair box through a first synchronous belt transmission. The first driven wheel is coaxially installed at the output end of the first bevel gear group arranged outside the repair box, and a first synchronous wheel is provided at the input end of the first bevel gear group. The axis of the first synchronous wheel is parallel to the axis of the driving wheel, and the first synchronous wheel and the driving wheel are connected through a second synchronous belt transmission.

[0007] Preferably, the repair box is provided with an opening at one end away from the rotating seat, and two sliding side plates with the same plane shape in the width direction of the repair box are slidably installed in the repair box, and the two sliding side plates are fixedly connected by several guide rods extending along the length direction of the repair box at the top, and the rotating shaft is rotatably installed on the two sliding side plates, and the sliding side plates are provided with several fitting grooves that fit the outer wall of the partition plate, and the bottom of the sliding side plates fits the bottom of the repair box; a material connecting inclined plate is provided on the opening side of the repair box, and the sliding side plate moves to above the material connecting inclined plate to push the soil in the repair box out of the repair box.

[0008] Preferably, a guide sleeve is provided at one end of the top of the repair box close to the opening side, and the guide rod is inserted in the guide sleeve. Linear drives are provided on both sides of the outside of the repair box. The working end of the linear drive is fixedly connected to the sliding side plate away from the rotating seat, and the working end of the linear drive moves along the axis direction of the guide rod to push the sliding side plate to move.

[0009] Preferably, a cross-shaped insertion slot is provided at one end of the rotating shaft close to the rotating seat, and a mounting through hole is provided on the repair box which is in the same straight line as the rotating shaft. The rotating seat is rotatably installed in the mounting through hole, and the end of the rotating seat facing the interior of the repair box is flush with the inner wall of the repair box. An inner mounting hole is coaxially provided at one end of the rotating seat facing the interior of the repair box, and the inner mounting hole has the same shape and size as the insertion slot. A cross connecting block with the same shape as the insertion slot is elastically installed in the inner mounting hole, and the cross connecting block protrudes from the surface of the rotating seat. When the cross connecting block is inserted in the insertion slot, the rotating shaft and the rotating seat rotate synchronously.

[0010] Preferably, a first axial hole and a second axial hole which are on the same axis as the rotating seat are provided in the inner mounting hole, a shaft rod with the same inner diameter as the first axial hole is provided on the cross connecting block, the shaft rod is inserted into the first axial hole, and a limit head with the same inner diameter as the second axial hole is coaxially provided at one end of the shaft rod away from the cross connecting block, a spring is provided in the second axial hole, the spring elastically connects the inner wall of the second axial hole and the limit head, and the elastic force of the spring causes the cross connecting block to protrude from the surface of the rotating seat.

[0011] Preferably, a second synchronous wheel is coaxially provided at one end of the rotating shaft away from the rotating seat, each second synchronous wheel is connected to a second driven wheel rotatably mounted on the sliding side plate through a third synchronous belt transmission, the second driven wheel is coaxially mounted on the output end of a second bevel gear set arranged on the outer side of the sliding side plate, and a traveling gear is provided at the input end of the second bevel gear set, and the axis of the traveling gear is arranged horizontally perpendicular to the axis of the rotating shaft, and a rack is fixedly installed on the outside of the repair box, extending horizontally along the axis of the rotating shaft to above the material splicing inclined plate, and the traveling gear is meshed with the rack.

[0012] Preferably, when the sliding side plate away from the rotating seat blocks the opening side of the repair box, the traveling gear is separated from the end of the rack close to the rotating seat.

[0013] Preferably, a plurality of limiting wheels are rotatably mounted on the side of the repair box provided with the first driven wheel and the sliding side plate provided with the second driven wheel, and the limiting wheels are respectively located on both sides of the rotating seat and the second synchronous wheel.

[0014] Preferably, the repair box is provided with a blocking block for blocking the air cavity, the blocking block is provided with a steam inlet hole, and the output end of the steam branch pipe is connected to the steam inlet hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention guides the steam through a three-way valve, allowing the blades to rotate as needed, reducing the disturbance to the environment inside the repair box. This ensures that the clumped solid polluted waste can be broken up and the internal environment of the solid waste pollution equipment is stable when it is working, avoiding the large amount of energy consumption caused by the continuous rotation of the impeller driven by steam in traditional equipment. In addition, the steam can flow back, be reheated and pressurized, and then contact the soil again, thereby improving the steam utilization rate and reducing the overall energy consumption.

[0016] Secondly, the design of the sliding side plate in the present invention can quickly and effectively push out the soil in the repair box, greatly improving the unloading efficiency. When the sliding side plate moves along the length direction of the repair box, the traveling gear installed on the outside of the sliding side plate engages with the rack fixed on the outside of the repair box. In the process of the sliding side plate moving to push the soil, the rotating shaft automatically rotates to throw out the soil attached to the surface of the blade, ensuring that the soil is completely unloaded.

[0017] Thirdly, in the present invention, since the rotating shaft is pressed on the sliding side plate, the rotating shaft and the blades move with the sliding side plate, so they are engaged and separated by the cross connecting block elastically installed on the rotating seat and the insertion groove set in the end face of the rotating shaft, thereby ensuring effective power transmission between the rotating shaft and the rotating seat when splicing, and releasing the connection when unloading, without interfering with each other, so that the equipment can operate efficiently in different working stages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A three-dimensional diagram of a device for remediating volatile organic pollutants in soil using steam extraction in the first working state Figure 1 .

[0020] Figure 2 for Figure 1 Figure 1 shows the local method at point A.

[0021] Figure 3 This is a front view of a device for remediating volatile organic pollutants in soil using steam extraction in a first working state.

[0022] Figure 4 for Figure 3 Cross-sectional view at BB.

[0023] Figure 5 for Figure 4 A partial enlarged view of point C.

[0024] Figure 6 A three-dimensional diagram of a device for remediating volatile organic pollutants in soil using steam extraction in the first working state Figure 2 .

[0025] Figure 7 for Figure 6 A partial enlarged view of point D.

[0026] Figure 8 A side view of an apparatus for remediating soil containing volatile organic pollutants using steam extraction in a first working state.

[0027] Figure 9 for Figure 8 Cross-sectional view at EE.

[0028] Figure 10 for Figure 9 A partial enlarged view of point F.

[0029] Figure 11 This is a three-dimensional diagram of an apparatus for remediating volatile organic pollutants in soil using steam extraction in a second working state.

[0030] Figure 12 for Figure 11 A local enlarged view of point G.

[0031] Figure 13 This is a three-dimensional structural exploded diagram of an apparatus for remediating volatile organic pollutants in soil using steam extraction.

[0032] Explanation of reference numerals: 1. Repair box; 1a. Partition plate; 1a1. Air cavity; 1a2. Air outlet; 1a3. Guide sleeve; 1a4. Linear drive; 1a5. Blocking block; 1a6. Steam inlet; 1b. Rotating shaft; 1b1. Blade; 1b2. Insertion slot; 1b3. Second synchronous wheel; 1b4. Third synchronous belt; 1c. Rotating seat; 1c1. First synchronous belt; 1c2. Mounting through hole; 1c3. Inner mounting hole; 1c4. Cross connecting block; 1c5. First axial hole; 1c6. Second axial hole; 1c7. Shaft; 1c8. Limiting head; 1c9. Spring; 1d. First 1. A driven wheel; 1d1. A first bevel gear set; 1d2. A first synchronous wheel; 1e. A sliding side plate; 1e1. A guide rod; 1e2. A fitting groove; 1e3. A second driven wheel; 1e4. A second bevel gear set; 1e5. A traveling gear; 1e6. A rack; 1f. A material receiving inclined plate; 1g. A limiting wheel; 2. A high-pressure steam generating unit; 2a. A high-pressure steam tank; 2a1. A steam outlet channel; 2a2. A reflux channel; 2b. A first sealed tank; 2b1. A impeller; 2b2. A driving wheel; 2b3. A second synchronous belt; 2c. A three-way valve; 2d. A second sealed tank; 2d1. A steam branch pipe. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Figures 1 to 13 : A device for remediating volatile organic pollutants in soil using steam extraction includes a remediation box 1 and a high-pressure steam generating unit 2. The remediation box 1 is provided with a plurality of vertical partition plates 1a extending along the length of the remediation box 1. A rotating shaft 1b is rotatably installed in two adjacent partition plates 1a, and blades 1b1 are provided on the circumference of the rotating shaft 1b; an air cavity 1a1 is provided in the partition plate 1a, and air outlet holes 1a2 communicating with the air cavity 1a1 are provided on both sides of the partition plate 1a. The high-pressure steam generating unit 2 includes a high-pressure steam tank 2a, which is provided with a steam outlet channel 2a1, which is connected to a first sealed tank 2b. The input end of the first sealed tank 2b is connected to the reflux channel 2a2 of the high-pressure steam tank 2a. An impeller 2b1 is rotatably installed in the first sealed tank 2b. Steam enters the first sealed tank 2b to drive the impeller 2b1 to rotate. The impeller 2b1 is coaxially connected to the drive wheel 2b2 located outside the first sealed tank 2b, and the drive wheel 2b2 is connected to the rotating shaft 1b. A three-way valve 2c is provided at the connection between the steam outlet channel 2a1 and the first sealed tank 2b. The output end of the three-way valve 2c is respectively connected to the first sealed tank 2b and the input end of the second sealed tank 2d. The second sealed tank 2d is provided with several steam branch pipes 2d1 connected to each air cavity 1a1.

[0035] In the present application, the hot steam generated by the high-pressure steam generating unit 2 enters the high-pressure steam tank 2a, and then enters the first sealed tank 2b from the steam outlet channel 2a1 through the guidance of the three-way valve 2c, pushing the internal impeller 2b1 to rotate, and the impeller 2b1 drives the coaxial drive wheel 2b2 to rotate. The drive wheel 2b2 is connected to the rotating shaft 1b in the repair box 1 through a transmission structure, so that the blades 1b1 on the rotating shaft 1b stir the soil between adjacent partitions 1a, which can both break up the soil clumps and increase the gaps in the soil. The shape of the blades 1b1 can be set accordingly, and the figure is only a schematic diagram. The steam flowing out of the first sealed tank 2b returns to the high-pressure steam tank 2a through the reflux channel 2a2 to increase the temperature and pressure again, avoiding the hot steam that consumes a lot of energy to directly extract the soil. When soil is leached, the hot steam in the high-pressure steam tank 2a is guided by the three-way valve 2c and directly enters the second sealed tank 2d from the steam outlet channel 2a1, and is then transported to the air cavity 1a1 of the partition plate 1a through the steam branch pipe 2d1, and finally ejected from the air outlet 1a2, fully contacting the soil to vaporize the volatile pollutants. The vaporized pollutants are discharged along with the steam through the exhaust system set at the top of the repair box 1 for treatment. In this embodiment, the steam is guided by the three-way valve 2c, and the blades 1b1 rotate on demand rather than continuously, which reduces the disturbance to the environment in the repair box 1, ensures that the steam and the soil can be in uniform contact, creates stable conditions for the effective mixing and volatilization of pollutants, and avoids the large amount of energy consumption caused by the continuous rotation of the impeller 2b1 driven by steam in traditional equipment. In addition, the steam can be refluxed and reheated, which improves the steam utilization rate and reduces the overall energy consumption. In this embodiment, the partition plate 1a divides the interior of the repair box 1, and cooperates with the blade 1b1 to specifically stir part of the soil and the steam ejected from the outlet 1a2, thereby reducing the resistance of the blade 1b1 during stirring, increasing the contact area between the soil and the steam, strengthening the mass transfer process, vaporizing the pollutants faster, and improving the repair efficiency.

[0036] In order to solve the problem of how to drive the rotating shaft 1b and the blades 1b1 to rotate after the steam drives the impeller 2b1 to rotate, the following features are specifically set: The axial direction of the rotating shaft 1b is parallel to the length direction of the partition plate 1a. Several rotating seats 1c are rotatably installed on the repair box 1, and are coaxially connected to the rotating shaft 1b respectively. One end of each rotating seat 1c is located outside the repair box 1 and is connected to the first driven wheel 1d rotatably installed on the repair box 1 through a first synchronous belt 1c1. The first driven wheel 1d is coaxially installed on the output end of the first bevel gear set 1d1 set outside the repair box 1. The input end of the first bevel gear set 1d1 is provided with a first synchronous wheel 1d2. The axis of the first synchronous wheel 1d2 is parallel to the axis of the driving wheel 2b2. The first synchronous wheel 1d2 is connected to the driving wheel 2b2 through a second synchronous belt 2b3.

[0037] In this embodiment, when high-pressure steam enters the first sealed tank 2b, driving the impeller 2b1 to rotate, the drive wheel 2b2, coaxial with the impeller 2b1, rotates accordingly. The drive wheel 2b2 transmits power to the first synchronous wheel 1d2 via the second synchronous belt 2b3. Since the first synchronous wheel 1d2 is mounted at the input end of the first bevel gear set 1d1, the rotation of the first synchronous wheel 1d2 drives the first bevel gear set 1d1, thereby changing the direction of the power. The first driven wheel 1d at the output end of the first bevel gear set 1d1 then transmits power to the rotating base 1c via the first synchronous belt 1c1. Because the rotating base 1c is coaxially connected to the rotating shaft 1b, the rotation of the rotating base 1c ultimately drives the rotating shaft 1b and the blades 1b1 mounted on its circumference to rotate, completing the mixing of the soil between the adjacent partitions 1a.

[0038] In order to facilitate the unloading of the soil in the repair box 1 after the leaching and repair is completed, the following features are specifically set: The repair box 1 is provided with an opening at one end away from the rotating seat 1c, and two sliding side plates 1e with the same plane shape as the repair box 1 in the width direction are slidably installed in the repair box 1. The two sliding side plates 1e are fixedly connected by several guide rods 1e1 extending along the length direction of the repair box 1 at the top, and the rotating shaft 1b is rotatably installed on the two sliding side plates 1e. The sliding side plates 1e are provided with several fitting grooves 1e2 that fit the outer wall of the partition plate 1a, and the bottom of the sliding side plates 1e fits the bottom of the repair box 1; a material connecting inclined plate 1f is provided on the opening side of the repair box 1, and the sliding side plate 1e moves to above the material connecting inclined plate 1f to push the soil in the repair box 1 out of the repair box 1.

[0039] In this embodiment, sliding side panels 1e are provided at both ends of the repair box 1 in the longitudinal direction. In the working state, the sliding side panels 1e are located at both ends of the repair box 1, forming a repair box 1 structure that is only open upward. When the soil in the repair box 1 is leached and repaired, the two sliding side panels 1e are fixedly connected by the guide rod 1e1 and slide synchronously along the longitudinal direction of the repair box 1. During the sliding process, the fitting groove 1e2 on the sliding side panel 1e fits tightly against the outer wall of the partition plate 1a to prevent the soil from leaking from the side gaps. At the same time, the bottom of the sliding side panel 1e always fits against the bottom of the repair box 1 to ensure that the soil will not scatter from the bottom during the pushing process. As the sliding side panel 1e moves toward the opening side of the repair box 1, the soil in the box is gradually pushed out until the soil is pushed onto the material receiving inclined plate 1f on the opening side. With the help of the inclination angle of the material receiving inclined plate 1f, the soil slides out of the repair box 1 smoothly, completing the unloading operation. Through the design of the sliding side plate 1e, this embodiment can quickly and effectively push out the soil in the repair box 1. Compared with traditional manual or complex mechanical unloading methods, it greatly improves the unloading efficiency, saves manpower and time costs, and facilitates continuous soil remediation work.

[0040] In order to achieve the purpose of smooth movement of the sliding side plate 1e along the length direction of the repair box 1, the following features are specifically set: A guide sleeve 1a3 is provided at one end of the top of the repair box 1 close to the opening side, and a guide rod 1e1 is inserted into the guide sleeve 1a3. Linear drives 1a4 are provided on both sides of the outside of the repair box 1. The working end of the linear drive 1a4 is fixedly connected to the sliding side plate 1e away from the rotating seat 1c. The working end of the linear drive 1a4 moves along the axial direction of the guide rod 1e1 to push the sliding side plate 1e to move.

[0041] When it is necessary to push the sliding side plate 1e to move in order to discharge the soil that has been leached and repaired in the repair box 1, start the linear actuators 1a4 on both sides of the outside of the repair box 1. The linear actuator 1a4 can be a cylinder, etc. The working end of the linear actuator 1a4 extends along the axial direction of the guide rod 1e1, pushing the sliding side plate 1e away from the rotating seat 1c to move. During the movement, the guide rod 1e1 is inserted into the guide sleeve 1a3 on the top of the repair box 1. The guide sleeve 1a3 limits and guides the guide rod 1e1, ensuring that the guide rod 1e1 and the sliding side plate 1e connected thereto move smoothly along the length direction of the repair box 1 until the sliding side plate 1e pushes the soil in the repair box 1 onto the receiving inclined plate 1f, completing the soil unloading operation.

[0042] Since the shaft 1b is pressed on the sliding side plate 1e, the shaft 1b and the blade 1b1 move along with the sliding side plate 1e. In order to achieve the purpose of both separating the shaft 1b and the rotating seat 1c and connecting them in a fast transmission, the following features are specifically set: A cross-shaped insertion slot 1b2 is provided at one end of the rotating shaft 1b close to the rotating seat 1c, and a mounting through hole 1c2 is provided on the repair box 1 which is in the same straight line as the rotating shaft 1b. The rotating seat 1c is rotatably installed in the mounting through hole 1c2, and the end of the rotating seat 1c facing the interior of the repair box 1 is flush with the inner wall of the repair box 1. An inner mounting hole 1c3 is coaxially provided at the end of the rotating seat 1c facing the interior of the repair box 1. The inner mounting hole 1c3 has the same shape and size as the insertion slot 1b2, and a cross connecting block 1c4 with the same shape as the insertion slot 1b2 is elastically installed in the inner mounting hole 1c3. The cross connecting block 1c4 protrudes from the surface of the rotating seat 1c, and when the cross connecting block 1c4 is inserted into the insertion slot 1b2, the rotating shaft 1b and the rotating seat 1c rotate synchronously.

[0043] In this embodiment, when the soil in the repair box 1 needs to be stirred, the sliding side plate 1e is moved into the repair box 1, and the insertion slot 1b2 of the rotating shaft 1b near one end of the rotating seat 1c is inserted and connected with the cross-connecting block 1c4 on the rotating seat 1c. At this time, the rotating shaft 1b and the rotating seat 1c are connected in transmission. When the driving wheel 2b2 drives the rotating seat 1c to rotate through the transmission structure, the rotating shaft 1b and the rotating seat 1c rotate synchronously, thereby driving the blades 1b1 to stir the soil. When the soil leaching and repair is completed, the linear drive 1a4 pushes the sliding side plate 1e to move away from the rotating seat 1c, and the insertion slot 1b2 on the rotating shaft 1b gradually separates from the cross-connecting block 1c4, so that the rotating shaft 1b is disconnected from the rotating seat 1c. In this embodiment, by inserting and separating the cross-connecting block 1c4 and the insertion slot 1b2, the rotating shaft 1b and the rotating seat 1c are effectively transmitted during splicing, and the connection is disconnected during unloading, without interfering with each other, so that the equipment can operate efficiently in different working stages.

[0044] In order to solve the problem that the insertion groove 1b2 of the rotating shaft 1b and the cross connection block 1c4 on the rotating seat 1c cannot be inserted and connected when they are not aligned, the following features are specifically set: The inner mounting hole 1c3 is provided with a first axial hole 1c5 and a second axial hole 1c6 which are on the same axis as the rotating seat 1c. The cross connecting block 1c4 is provided with a shaft rod 1c7 with the same inner diameter as the first axial hole 1c5. The shaft rod 1c7 is inserted into the first axial hole 1c5. The end of the shaft rod 1c7 away from the cross connecting block 1c4 is coaxially provided with a limit head 1c8 with the same inner diameter as the second axial hole 1c6. A spring 1c9 is provided in the second axial hole 1c6. The spring 1c9 elastically connects the inner wall of the second axial hole 1c6 and the limit head 1c8. The elastic force of the spring 1c9 causes the cross connecting block 1c4 to protrude from the surface of the rotating seat 1c.

[0045] In this embodiment, when the rotating shaft 1b moves toward the rotating seat 1c along the sliding side plate 1e, if the insertion slot 1b2 and the cross-connecting block 1c4 are not fully aligned, the cross-connecting block 1c4 is first squeezed by the end face of the rotating shaft 1b. At this time, the cross-connecting block 1c4 slides within the first axial hole 1c5 via the shaft 1c7, and the limit head 1c8 compresses the spring 1c9 within the second axial hole 1c6, causing the cross-connecting block 1c4 to retract toward the inner mounting hole 1c3 of the rotating seat 1c. As the rotating shaft 1b continues to move, the insertion slot 1b2 and the cross-connecting block 1c4 gradually align. The elastic force of the spring 1c9 pushes the limit head 1c8 and the shaft 1c7 to reset, and the cross-connecting block 1c4 is inserted into the insertion slot 1b2 to complete the connection. During this process, the elastic buffering of the spring 1c9 ensures that the cross-connecting block 1c4 can adapt to the positional deviation of the insertion slot 1b2, ensuring the transmission connection between the rotating seat 1c and the rotating shaft 1b.

[0046] In order to achieve the purpose of causing the rotating shaft 1b to drive the blade 1b1 to rotate during the movement of the sliding side plate 1e so as to discharge the soil attached to the blade, the following features are specifically set: A second synchronous wheel 1b3 is coaxially provided at one end of the rotating shaft 1b away from the rotating seat 1c. Each second synchronous wheel 1b3 is connected to the second driven wheel 1e3 rotatably mounted on the sliding side plate 1e through a third synchronous belt 1b4. The second driven wheel 1e3 is coaxially mounted on the output end of the second bevel gear set 1e4 arranged on the outer side of the sliding side plate 1e. A traveling gear 1e5 is provided at the input end of the second bevel gear set 1e4. The axis of the traveling gear 1e5 is arranged horizontally perpendicular to the axis of the rotating shaft 1b. A rack 1e6 is fixedly installed on the outside of the repair box 1 and extends horizontally along the axis direction of the rotating shaft 1b to above the material splicing inclined plate 1f. The traveling gear 1e5 is meshed with the rack 1e6.

[0047] In this embodiment, when the linear drive 1a4 pushes the sliding side plate 1e to move along the length direction of the repair box 1, the traveling gear 1e5 installed on the outside of the sliding side plate 1e engages with the rack 1e6 fixed on the outside of the repair box 1. When the traveling gear 1e5 rolls on the rack 1e6, it drives the input end of the second bevel gear set 1e4 to rotate, and the second bevel gear set 1e4 transmits power to the second driven wheel 1e3 at the output end. The second driven wheel 1e3 drives the second synchronous wheel 1b3 at one end of the rotating shaft 1b away from the rotating seat 1c to rotate through the third synchronous belt 1b4, so that the rotating shaft 1b drives the blade 1b1 to rotate. In the process of the sliding side plate 1e moving to push the soil, the rotating blade 1b1 throws out the soil attached to the surface of the blade through centrifugal force and mechanical scraping, ensuring that the soil is completely discharged.

[0048] In order to ensure that the meshing connection between the traveling gear 1e5 and the rack 1e6 does not affect the rotation of the rotating shaft driven by the rotating seat 1c, the following features are specifically set: When the sliding side plate 1e away from the rotating seat 1c blocks the opening side of the repair box 1, the traveling gear 1e5 disengages from the rack 1e6 and approaches one end of the rotating seat 1c.

[0049] In this embodiment, the rack 1e6 is positioned so that when the sliding side plate 1e moves to its initial position, sealing the opening side of the repair box 1, the travel gear 1e5 disengages from the rack 1e6. Therefore, when soil mixing is required, the drive wheel 2b2, through the transmission structure, rotates the rotating base 1c. Because the travel gear 1e5 is not engaged with the rack 1e6, no resistance is applied to the rotation of the rotating shaft 1b. When the sliding side plate 1e moves toward the opening to unload material, the travel gear 1e5 moves to a position where it engages with the rack 1e6, disengaging the rotating base 1c from the rotating shaft 1b.

[0050] In order to ensure the transmission effect of the first synchronous belt 1c1 and the third synchronous belt (1b4), the following features are specifically set: A plurality of limiting wheels 1g are rotatably mounted on one side of the repair box 1 where the first driven wheel 1d is provided and on the sliding side plate 1e where the second driven wheel 1e3 is provided. The limiting wheels 1g are respectively located on both sides of the rotating seat 1c and the second synchronous wheel 1b3.

[0051] In this embodiment, the limiting wheels 1g are located on either side of the rotating seat 1c and the second synchronous wheel 1b3. By changing the wrap angle and path of the first synchronous belt 1c1 and the third synchronous belt (1b4), the first synchronous belt 1c1 and the third synchronous belt (1b4) are always kept at appropriate tension. When the rotating shaft 1b moves with the sliding side plate 1e, the limiting wheels 1g are adjusted accordingly, ensuring that the first synchronous belt 1c1 and the third synchronous belt (1b4) do not slip or fall off during the transmission process.

[0052] In order to allow the steam in the second sealed tank 2d to be transported into each air cavity 1a1, the following features are specifically set: The repair box 1 is provided with a blocking block 1a5 for blocking the air cavity 1a1. The blocking block 1a5 is provided with a steam inlet hole 1a6. The output end of the steam branch pipe 2d1 is connected to the steam inlet hole 1a6.

[0053] In this embodiment, after the hot steam in high-pressure steam tank 2a is directed through three-way valve 2c into second sealed tank 2d, it is transported through steam branch pipe 2d1 to the steam inlet 1a6 of each blocking block 1a5 in repair box 1. The steam enters air cavity 1a1 through steam inlet 1a6 and is ejected through outlet 1a2 on both sides of partition plate 1a, evenly affecting the soil in repair box 1, achieving leaching and remediation of volatile organic pollutants.

[0054] Working principle: The hot steam generated by the high-pressure steam generating unit 2 enters the high-pressure steam tank 2a, and then enters the first sealed tank 2b through the steam outlet channel 2a1 through the guidance of the three-way valve 2c, driving the internal impeller 2b1 to rotate, and the impeller 2b1 drives the coaxial drive wheel 2b2 to rotate. The drive wheel 2b2 is connected to the rotating shaft 1b in the repair box 1 through a transmission structure, so that the blades 1b1 on the rotating shaft 1b stir the soil between adjacent partitions 1a, which can not only break up the soil clumps, but also increase the gaps in the soil. The steam flowing out of the first sealed tank 2b returns to the high-pressure steam tank 2a through the reflux channel 2a2 to increase the temperature and pressure again, avoiding the hot steam that consumes a lot of energy to directly extract the soil. When soil is leached, the hot steam in the high-pressure steam tank 2a is guided by the three-way valve 2c and directly enters the second sealed tank 2d from the steam outlet channel 2a1. It is then transported to the air cavity 1a1 of the partition plate 1a through the steam branch pipe 2d1, and finally ejected from the air outlet 1a2. It fully contacts the soil and vaporizes the volatile pollutants. The vaporized pollutants are discharged and processed along with the steam through the exhaust system installed on the top of the repair box 1.

[0055] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A device for remediating volatile organic pollutants in soil using steam extraction, comprising a remediation box (1) and a high-pressure steam generating unit (2), characterized in that: A plurality of vertical partition plates (1a) extending along the length direction of the repair box (1) are provided in the repair box (1); a rotating shaft (1b) is rotatably installed in two adjacent partition plates (1a), and blades (1b1) are provided on the circumference of the rotating shaft (1b); An air cavity (1a1) is provided in the partition plate (1a), and air outlet holes (1a2) communicating with the air cavity (1a1) are provided on both sides of the partition plate (1a). The high-pressure steam generating unit (2) comprises a high-pressure steam tank (2a), a steam outlet channel (2a1) is provided on the high-pressure steam tank (2a), the steam outlet channel (2a1) is communicated with the first sealed tank (2b), the input end of the first sealed tank (2b) is connected to the reflux channel (2a2) of the high-pressure steam tank (2a), an impeller (2b1) is rotatably installed in the first sealed tank (2b), steam enters the first sealed tank (2b) to drive the impeller (2b1) to rotate, the impeller (2b1) is coaxially connected to a drive wheel (2b2) ​​located outside the first sealed tank (2b), and the drive wheel (2b2) ​​is transmission-connected to the rotating shaft (1b); A three-way valve (2c) is provided at the connection between the steam outlet channel (2a1) and the first sealed tank (2b); the output end of the three-way valve (2c) is respectively connected to the input ends of the first sealed tank (2b) and the second sealed tank (2d); and the second sealed tank (2d) is provided with a plurality of steam branch pipes (2d1) connected to each air cavity (1a1).

2. The device for remediating volatile organic pollutants in soil by steam extraction according to claim 1, characterized in that: The axis direction of the rotating shaft (1b) is parallel to the length direction of the partition plate (1a). A plurality of rotating seats (1c) coaxially connected to the rotating shaft (1b) are rotatably mounted on the repair box (1). One end of each rotating seat (1c) located outside the repair box (1) is connected to a first driven wheel (1d) rotatably mounted on the repair box (1) via a first synchronous belt (1c1). The first driven wheel (1d) is coaxially mounted on the output end of a first bevel gear set (1d1) provided outside the repair box (1). A first synchronous wheel (1d2) is provided at the input end of the first bevel gear set (1d1). The axis of the first synchronous wheel (1d2) is parallel to the axis of the driving wheel (2b2). The first synchronous wheel (1d2) is connected to the driving wheel (2b2) ​​via a second synchronous belt (2b3).

3. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 2, characterized in that: The repair box (1) is provided with an opening at one end away from the rotating seat (1c), and two sliding side plates (1e) having the same planar shape as the repair box (1) in the width direction are slidably installed in the repair box (1), and the two sliding side plates (1e) are fixedly connected by a plurality of guide rods (1e1) extending along the length direction of the repair box (1) at the top, and the rotating shaft (1b) is rotatably installed on the two sliding side plates (1e), and the sliding side plates (1e) are provided with a plurality of fitting grooves (1e2) fitting the outer wall of the partition plate (1a), and the bottom of the sliding side plate (1e) fits the bottom of the repair box (1); A material receiving inclined plate (1f) is provided on the opening side of the repair box (1), and the sliding side plate (1e) moves above the material receiving inclined plate (1f) to push the soil in the repair box (1) out of the repair box (1).

4. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 3, characterized in that: A guide sleeve (1a3) is provided at one end of the top of the repair box (1) close to the opening side, and a guide rod (1e1) is inserted into the guide sleeve (1a3). Linear drives (1a4) are provided on both sides of the outside of the repair box (1). The working end of the linear drive (1a4) is fixedly connected to the sliding side plate (1e) away from the rotating seat (1c). The working end of the linear drive (1a4) moves along the axial direction of the guide rod (1e1) to push the sliding side plate (1e) to move.

5. The device for remediating volatile organic pollutants in soil by steam extraction according to claim 3, characterized in that: A cross-shaped insertion slot (1b2) is provided at one end of the rotating shaft (1b) close to the rotating seat (1c), and a mounting through hole (1c2) is provided on the repair box (1) in the same straight line as the rotating shaft (1b). The rotating seat (1c) is rotatably mounted in the mounting through hole (1c2), and the end of the rotating seat (1c) facing the interior of the repair box (1) is flush with the inner wall of the repair box (1). An inner mounting hole (1c3) is coaxially provided at the end of the rotating seat (1c) facing the interior of the repair box (1), and the inner mounting hole (1c3) has the same shape and size as the insertion slot (1b2). A cross connecting block (1c4) having the same shape as the insertion slot (1b2) is elastically mounted in the inner mounting hole (1c3), and the cross connecting block (1c4) protrudes from the surface of the rotating seat (1c). When the cross connecting block (1c4) is inserted into the insertion slot (1b2), the rotating shaft (1b) and the rotating seat (1c) rotate synchronously.

6. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 5, characterized in that: A first axial hole (1c5) and a second axial hole (1c6) are provided in the inner mounting hole (1c3) and are located on the same axis as the rotating seat (1c). A shaft rod (1c7) having the same inner diameter as the first axial hole (1c5) is provided on the cross connecting block (1c4). The shaft rod (1c7) is inserted into the first axial hole (1c5). A limiting head (1c8) having the same inner diameter as the second axial hole (1c6) is coaxially provided at one end of the shaft rod (1c7) away from the cross connecting block (1c4). A spring (1c9) is provided in the second axial hole (1c6). The spring (1c9) elastically connects the inner wall of the second axial hole (1c6) and the limiting head (1c8). The elastic force of the spring (1c9) causes the cross connecting block (1c4) to protrude from the surface of the rotating seat (1c).

7. The device for remediating volatile organic pollutants in soil by steam extraction according to claim 3, characterized in that: A second synchronous wheel (1b3) is coaxially arranged at one end of the rotating shaft (1b) away from the rotating seat (1c), and each second synchronous wheel (1b3) is connected to a second driven wheel (1e3) rotatably mounted on the sliding side plate (1e) through a third synchronous belt (1b4). The second driven wheel (1e3) is coaxially mounted on the output end of a second bevel gear set (1e4) arranged on the outside of the sliding side plate (1e). A traveling gear (1e5) is arranged at the input end of the second bevel gear set (1e4), and the axis of the traveling gear (1e5) is arranged horizontally perpendicular to the axis of the rotating shaft (1b). A rack (1e6) extending horizontally along the axis of the rotating shaft (1b) to above the material receiving inclined plate (1f) is fixedly mounted on the outside of the repair box (1), and the traveling gear (1e5) is meshedly connected with the rack (1e6).

8. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 7, characterized in that: When the sliding side plate (1e) away from the rotating seat (1c) blocks the opening side of the repair box (1), the running gear (1e5) is separated from the rack (1e6) and is close to one end of the rotating seat (1c).

9. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 7, characterized in that: A plurality of limiting wheels (1g) are rotatably mounted on one side of the repair box (1) provided with the first driven wheel (1d) and on the sliding side plate (1e) provided with the second driven wheel (1e3). The limiting wheels (1g) are respectively located on both sides of the rotating seat (1c) and the second synchronous wheel (1b3).

10. The device for remediating soil containing volatile organic pollutants by steam extraction according to claim 1, characterized in that: The repair box (1) is provided with a blocking block (1a5) for blocking the air cavity (1a1), the blocking block (1a5) is provided with a steam inlet hole (1a6), and the output end of the steam branch pipe (2d1) is connected to the steam inlet hole (1a6).

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