A thermodynamic purification device for soil remediation

Abstract

This invention belongs to the field of contaminated soil remediation technology, specifically relating to a thermodynamic purification device for soil remediation. The microwave remediation mechanism includes a support plate, a motor, a drive wheel, a transmission wheel, a wheel cylinder, a magnetron, and a waveguide. The support plate is obliquely installed inside the housing. Two transmission wheels are rotatably connected to the support plate. The motor is installed on the housing, and the drive wheel is installed on the output shaft of the motor. Both the drive wheel and the transmission wheel are meshed. The wheel cylinder is located above the transmission wheel and meshes with it. The wheel cylinder is obliquely positioned. The magnetron is installed on the support plate, and its output end passes through the support plate. The waveguide is rotatably connected to the output end of the magnetron and is located in the inlet of the wheel cylinder. The waveguide includes a main tube and multiple secondary tubes connected to the main tube. The secondary tubes are evenly distributed on the circumference of the main tube, and there are two rows of secondary tubes. Baffles are connected between corresponding rows of secondary tubes to solve the problem of uneven heating in existing soil remediation equipment.

Description

Technical Field

[0001] This invention relates to the field of contaminated soil remediation technology, and in particular to a thermodynamic purification device for soil remediation. Background Technology

[0002] Soil remediation refers to the use of physical, chemical, and biological methods to transfer, absorb, degrade, and transform pollutants in soil, reducing their concentration to acceptable levels, or converting toxic and harmful pollutants into harmless substances. Fundamentally, the technical principles of contaminated soil remediation can include: (1) changing the form of pollutants in the soil or their binding with the soil, reducing their mobility and bioavailability in the environment; and (2) reducing the concentration of harmful substances in the soil.

[0003] China's research on contaminated soil remediation is transitioning from laboratory research to practical application and is about to enter a period of rapid and comprehensive remediation.

[0004] Existing soil remediation technologies are mainly divided into bioremediation, chemical remediation, and physical remediation. Physical remediation methods are further divided into several types, one of which is thermodynamic remediation. Thermodynamic remediation technology utilizes heat conduction (heat blankets, hot wells, or hot walls, etc.) or heat radiation (radio wave heating) to remediate contaminated soil. A common approach in thermodynamic remediation is to generate high-temperature flue gas through combustion of natural gas. The flue gas temperature is generally not less than 600℃. This high-temperature flue gas flows through the soil, exchanging heat and heating the soil. After heat exchange, the flue gas is directly cooled through a condensation system before being released. However, high-temperature flue gas requires fossil fuels as a heat source, which can easily cause secondary pollution. Furthermore, the construction of on-site fuel storage, transportation, and combustion facilities presents significant safety hazards and management difficulties. Therefore, electromagnetic wave heating technology has emerged. Electromagnetic wave heating technology is also a type of thermodynamic remediation. It uses electromagnetic wave energy generated by high-frequency voltage to heat the soil, causing pollutants to be decomposed within soil particles, thus achieving the purpose of remediation. This method mainly utilizes the electromagnetic energy in radio waves for heating; the process does not require heat conduction from the soil and does not produce secondary pollution.

[0005] Existing electromagnetic wave remediation equipment typically consists of multiple fixed microwave generators positioned above a horizontal conveyor. The microwaves emitted by these generators penetrate the soil to achieve heating. However, microwaves move forward in a regular up-and-down oscillating manner, resulting in uneven heating of the soil on the horizontal conveyor belt, much like a microwave oven. To ensure even heating, a turntable is used to change the position of the food or a stirrer is added to disrupt the microwave's trajectory, thus ensuring uniform heating. Therefore, existing soil remediation equipment suffers from uneven heating. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a thermodynamic purification device for soil remediation, which solves the problem of uneven heating in existing soil remediation equipment.

[0007] The present invention solves the above-mentioned technical problems through the following technical means: A thermodynamic purification device for soil remediation includes a shell, a pretreatment mechanism, a conveying mechanism, a microwave remediation mechanism, and an exhaust gas treatment mechanism. The pretreatment mechanism is installed above the shell and communicates with the interior of the shell. The conveying mechanism is located inside the shell, below the pretreatment mechanism. The microwave remediation mechanism is located inside the shell, with its outlet extending into the inlet of the microwave remediation mechanism. The exhaust gas treatment mechanism is connected to the top of the shell, and an outlet is located at the bottom of the shell, below the outlet of the microwave remediation mechanism. The microwave remediation mechanism includes a support plate, a motor, a drive wheel, a transmission wheel, a wheel cylinder, and a magnetic control system. The tube and waveguide are mounted obliquely inside the housing. Two drive wheels are rotatably connected to the support plate. The motor is mounted on the housing, and the drive wheel is mounted on the output shaft of the motor. Both the drive wheel and the drive wheel are meshed. The wheel cylinder is located above the drive wheel and meshes with it. The wheel cylinder is obliquely positioned. The magnetron is mounted on the support plate, and its output end passes through the support plate. The waveguide is rotatably connected to the output end of the magnetron. The waveguide is located in the inlet of the wheel cylinder. The waveguide includes a main tube and multiple secondary tubes connected to the main tube. The secondary tubes are evenly distributed on the circumference of the main tube. There are two rows of secondary tubes, and baffles connect the corresponding rows of secondary tubes.

[0008] Based on the above technical solution, the present invention has also made the following improvements: Furthermore, the pretreatment mechanism includes a pair of gear columns, which are spaced apart and staggered. The two gear columns are used to compress the contaminated soil into small pieces.

[0009] Furthermore, the conveying mechanism includes a conveyor belt 31 with a trough. A guide plate is located at the outlet end of the pretreatment mechanism, and a column is located at the bottom end of the guide plate. The column can be inserted into the trough. Contaminated soil is generally sticky and contains moisture. The trough is used to drain excess water from the contaminated soil, and the column can slide within the trough to prevent it from becoming clogged.

[0010] Furthermore, the columns have two orientations: one diagonally forward and the other diagonally backward. These two types of columns are arranged alternately, and adjacent columns are connected by guide wires. The guide wires provide a certain degree of traction between adjacent columns, preventing them from shifting into other through slots.

[0011] Furthermore, the discharge port is filled with a gear train, which consists of multiple gears meshing in parallel. The gear train can crush the repaired dry soil, facilitating the discharge of waste gas from inside the soil block.

[0012] Furthermore, the tilt angle of the wheel cylinder is between 15 and 30 degrees. A smaller tilt angle results in a slower soil sliding speed, which prolongs the soil's reaction time within the wheel cylinder, leading to more thorough remediation.

[0013] Furthermore, the secondary tube and the main tube are set at an acute angle. The microwaves emitted through the waveguide can form an angle with the wheel cylinder, which facilitates the reflection of microwaves within the wheel cylinder.

[0014] Furthermore, the inner wall of the wheel cylinder is provided with raised ribs, which are spirally arranged along the radial direction of the wheel cylinder. The raised ribs can turn the soil over and also disrupt the microwaves inside the wheel cylinder, causing the microwave reflection path to become disordered and allowing it to be reflected onto more of the inner wall of the wheel cylinder.

[0015] The beneficial effects of this invention are as follows: The pretreatment mechanism performs preliminary treatment on the contaminated soil, breaking large clumps of soil into smaller pieces. The soil is then conveyed to the microwave repair mechanism by the conveying mechanism. As the soil falls from the conveying mechanism into the microwave repair mechanism, it comes into contact with the waveguide. The waveguide rotates under the impact of the soil, thereby changing the orientation of the waveguide and thus changing the microwave emission direction within the microwave treatment mechanism. This disrupts the microwave trajectory, allowing the microwaves to irradiate in all directions, ensuring that the soil in every corner receives microwave irradiation and resulting in more uniform soil heating. Furthermore, the soil rotates with the wheel in the microwave repair mechanism, further improving the uniformity of soil heating within the microwave repair mechanism. Attached Figure Description

[0016] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a three-dimensional structural diagram of the purification device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the purification device in an embodiment of the present invention. Figure 3 This is a cross-sectional structural diagram of the purification device in an embodiment of the present invention; Figure 4 yes Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the waveguide structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the pretreatment mechanism and the conveying mechanism in an embodiment of the present invention; Figure 7 yes Figure 6 A magnified view of a section at point B in the middle; Among them, 1-shell, 11-gear row, 2-pretreatment mechanism, 21-gear column, 22-guide plate, 23-column, 3-conveying mechanism, 31-conveyor belt, 32-through groove, 4-microwave repair mechanism, 41-support plate, 42-motor, 43-drive wheel, 44-transmission wheel, 45-wheel barrel, 46-magnetron, 47-waveguide, 471-main pipe, 472-secondary pipe, 473-baffle, 48-protrusion, 5-exhaust gas treatment mechanism. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1 to 7 As shown A thermodynamic purification device for soil remediation includes a shell 1, a pretreatment mechanism 2, a conveying mechanism 3, a microwave remediation mechanism 4, and a waste gas treatment mechanism 5. The pretreatment mechanism 2 is installed above the shell 1 and communicates with the interior of the shell 1. The pretreatment mechanism 2 is used to compress large, sticky contaminated soil into smaller pieces. The conveying mechanism 3 is located inside the shell 1, below the pretreatment mechanism 2, and is angled. The conveying mechanism 3 has an angled sliding plate at its tail, with baffles on both sides. The sliding plate has an isosceles trapezoidal structure from top to bottom. The microwave remediation mechanism 4 is located within the shell 1. Inside the housing 1, the slide plate at the outlet of the conveying mechanism 3 extends into the inlet of the microwave repair mechanism 4. The top of the housing 1 is connected to the exhaust gas treatment mechanism 5, which includes an exhaust fan and an air purifier. The exhaust fan is used to remove the exhaust gas generated by the microwave repair mechanism 4 during soil repair, and the air purifier is used to purify the exhaust gas. The bottom of the housing 1 is provided with a discharge port, which is located below the outlet of the microwave repair mechanism 4. The discharge port is used to discharge the purified soil. Two boxes are provided below the housing 1. The two boxes are distributed to collect the repaired soil and to collect water and contaminated soil that fall from the channel 32 of the conveying mechanism 3. The microwave repair mechanism 4 includes a support plate 41, a motor 42, a drive wheel 43, a transmission wheel 44, a wheel cylinder 45, a magnetron 46, and a waveguide 47. The support plate 41 is obliquely installed inside the housing 1. There are two support plates 41, one long and one short. The longer support plate 41 is located near the end of the conveying mechanism 3, and the shorter support plate 41 is located at the discharge port. The transmission wheel 44 is rotatably connected between the support plates 41. There are two transmission wheels 44. The motor 42 is mounted on the housing 1. The drive wheel 43 is mounted on the output shaft of the motor 42. Both the drive wheel 43 and the transmission wheel 44 are meshed. The motor 42 drives the drive wheel 43 to rotate, which in turn drives the transmission wheel 44 to rotate. The wheel cylinder 45 is located above the transmission wheel 44 and between the two transmission wheels 44. The wheel cylinder 45 meshes with the transmission wheel 44 and is obliquely positioned. The transmission wheel 44 drives the wheel cylinder 45 to rotate, facilitating soil turnover within the wheel cylinder 45. The inner wall of cylinder 45 is rough to reduce soil flow velocity. Magnetron 46 is mounted on support plate 41 near the conveying mechanism 3. The output end of magnetron 46 passes through support plate 41. Waveguide 47 is rotatably connected to the output end of magnetron 46. Waveguide 47 is located in the inlet of cylinder 45. There are two waveguides 47, which are arranged horizontally symmetrically. Waveguide 47 includes a main pipe 471 and multiple secondary pipes 472 connected to the main pipe 471. The main pipe 471 is located directly below the exit end of the slide plate. The secondary pipes 472 are evenly distributed on the circumference of the main pipe 471. There are two rows of secondary pipes 472. Baffles 473 are connected between corresponding rows of secondary pipes 472. The contaminated soil discharged from the conveying mechanism 3 will impact the baffles 473. The baffles 473 rotate downward under the impact of the soil, thereby driving the waveguide 47 to rotate, thus changing the microwave path emitted by the waveguide 47.By disrupting the trajectory of the microwaves within the microwave repair mechanism 4, the microwaves can irradiate in all directions, ensuring that the soil in every corner receives microwave irradiation, resulting in more uniform soil heating.

[0018] Specifically, the pretreatment mechanism 2 includes a pair of gear columns 21, which are spaced apart and staggered. Contaminated soil is generally sticky and difficult to crush, but under the compression of the two gear columns 21, the contaminated soil can be turned into small, flat strips.

[0019] Specifically, the conveying mechanism 3 includes a conveyor belt 31, on which through grooves 32 are provided. Multiple through grooves 32 are intermittently arranged side-by-side in a multi-row, multi-column layout. The outlet end of the pretreatment mechanism 2 is provided with a guide plate 22, and the bottom end of the guide plate 22 is provided with a column 23 that can be inserted into the through grooves 32. The column 23 can clean the through grooves 32, preventing them from becoming blocked.

[0020] Specifically, the column bars 23 have two orientations: one is diagonally forward, and the other is diagonally backward. The two types of column bars 23 are arranged alternately, and a guide wire connects adjacent column bars 23. The guide wire can play a certain traction role between adjacent column bars 23, which can prevent the column bars 23 from being misaligned into other through slots 32.

[0021] Specifically, the discharge port is filled with a gear rack 11, which is composed of multiple gears meshing side by side. Driven by the drive unit, the gears can crush the purified soil, and the rotation directions of two adjacent gears in the gear rack 11 are opposite.

[0022] Specifically, the tilt angle of the cylinder 45 is between 15 and 30 degrees. A smaller tilt angle results in a slower soil sliding speed, which prolongs the soil's reaction time within the cylinder 45, leading to more thorough remediation.

[0023] Specifically, the secondary tube 472 and the main tube 471 are arranged at an acute angle. The microwaves emitted through the waveguide 47 can form an angle with the wheel cylinder 45, which facilitates the reflection of microwaves within the wheel cylinder 45.

[0024] Specifically, the inner wall of the wheel cylinder 45 is provided with a raised strip 48, which is spirally arranged along the radial direction of the wheel cylinder 45. The raised strip 48 can turn over the soil and also disturb the microwaves inside the wheel cylinder 45, making the microwave reflection path more disordered and able to be reflected onto more of the inner wall of the wheel cylinder 45.

[0025] The method of using this invention is as follows: Contaminated soil is placed in the pretreatment unit 2, which flattens the soil and then conveys it to the conveying unit 3. Most of the water in the contaminated soil is discharged from the channel 32. The conveying unit 3 transports the filtered soil to the microwave repair unit 4. As the soil falls from the conveying unit 3 into the microwave repair unit 4, it comes into contact with the waveguide 47. The magnetron 46 emits microwaves, which, guided by the waveguide 47, irradiate the wheel cylinder 45. The microwaves are continuously reflected within the wheel cylinder 45 until they exit. The waveguide 47 rotates under the impact of the soil, thereby changing its orientation. This alters the microwave emission direction within the microwave processing mechanism, disrupting the microwave's trajectory. The microwaves can then irradiate in all directions, ensuring that the soil in every corner receives microwave irradiation, resulting in more uniform soil heating. Furthermore, the soil rotates with the wheel 45 within the microwave repair mechanism 4, further enhancing the uniformity of heating within the mechanism. After being repaired by the microwave repair mechanism 4, the contaminated soil is discharged onto the gear rack 11, which further crushes the repaired soil. This allows the waste gas trapped within the soil's inner wall to escape, and finally, the repaired soil is discharged from the outlet. The waste gas inside the casing 1 is purified by the waste gas treatment mechanism 5 before being discharged.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A thermodynamic purification device for soil remediation, comprising a shell (1), a pretreatment mechanism (2), a conveying mechanism (3), a microwave remediation mechanism (4), and a waste gas treatment mechanism (5), wherein the pretreatment mechanism (2) is installed above the shell (1) and communicates with the interior of the shell (1); the conveying mechanism (3) is located inside the shell (1) and below the pretreatment mechanism (2); the microwave remediation mechanism (4) is located inside the shell (1); the outlet of the conveying mechanism (3) extends into the inlet of the microwave remediation mechanism (4); the top of the shell (1) is connected to the waste gas treatment mechanism (5); and the bottom of the shell (1) is provided with a discharge port located below the outlet of the microwave remediation mechanism (4), characterized in that: The microwave repair mechanism (4) includes a support plate (41), a motor (42), a drive wheel (43), a transmission wheel (44), a wheel cylinder (45), a magnetron (46), and a waveguide (47). The support plate (41) is obliquely installed inside the housing (1). The transmission wheel (44) is rotatably connected to the support plate (41). There are two transmission wheels (44). The motor (42) is installed on the housing (1). The drive wheel (43) is installed on the output shaft of the motor (42). The drive wheel (43) and the transmission wheel (44) are both meshed. The wheel cylinder (45) is located above the transmission wheel (44). The wheel cylinder (45) is connected to the transmission wheel (44). The wheel (44) is engaged, the wheel cylinder (45) is obliquely arranged, the magnetron (46) is installed on the support plate (41), the output end of the magnetron (46) passes through the support plate (41), the waveguide (47) is rotatably connected to the output end of the magnetron (46), the waveguide (47) is located in the inlet of the wheel cylinder (45), the waveguide (47) includes a main tube (471) and a plurality of secondary tubes (472) connected to the main tube (471), the secondary tubes (472) are evenly distributed on the circumference of the main tube (471), the secondary tubes (472) are arranged in two rows, and baffles (473) are connected between the corresponding secondary tubes (472) in the front and rear rows.

2. The thermodynamic purification device for soil remediation according to claim 1, characterized in that: The pretreatment mechanism (2) includes a pair of gear columns (21), which are spaced apart and staggered.

3. The thermodynamic purification device for soil remediation according to claim 2, characterized in that: The conveying mechanism (3) includes a conveyor belt (31), which is provided with a through groove (32). The pretreatment mechanism (2) has a guide plate (22) at its outlet end, and a column (23) is provided at the bottom end of the guide plate (22). The column (23) can be inserted into the through groove (32).

4. The thermodynamic purification device for soil remediation according to claim 3, characterized in that: The column (23) has two orientations: one is diagonally forward and the other is diagonally backward. The two types of column (23) are arranged alternately, and a lead wire connects two adjacent column (23).

5. A thermodynamic purification device for soil remediation according to claim 4, characterized in that: The discharge port is filled with a gear rack (11), which is composed of multiple gears meshing side by side.

6. A thermodynamic purification device for soil remediation according to claim 5, characterized in that: The tilt angle of the wheel cylinder (45) is between 15 and 30 degrees.

7. A thermodynamic purification device for soil remediation according to claim 6, characterized in that: The secondary tube (472) and the main tube (471) are set at an acute angle.

8. A thermodynamic purification device for soil remediation according to claim 1, characterized in that: The inner wall of the wheel cylinder (45) is provided with a protrusion (48), which is spirally arranged along the radial direction of the wheel cylinder (45).

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