Thermal desorption and bioremediation combined soil purifier

Abstract

The invention discloses a thermal desorption and bioremediation combined soil purifier, and belongs to the technical field of soil remediation, the thermal desorption and bioremediation combined soil purifier comprises a purification cylinder, and three supporting legs are arranged at the bottom of the purification cylinder; a circular partition plate is arranged in the purification barrel and divides the interior of the purification barrel into a mixing cavity and a heating cavity, the mixing cavity is provided with a discharging pipe which penetrates through the heating cavity and extends to the bottom of the purification barrel, a repairing and stirring assembly is arranged in the mixing cavity, and the repairing and stirring assembly is rotationally connected with the purification barrel; and a pyrolysis absorption assembly is arranged in the heating cavity, the pyrolysis absorption assembly is rotationally connected with the discharging pipe, an inlet is formed in the top of the purification cylinder, and a feeding box communicating with the purification cylinder is arranged at the top of the purification cylinder. The method can be matched with the soil pollution degree and the remediation stage and adapt to soil thickness and accumulation state changes.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil remediation, and particularly relates to a combined soil purifier for pyrolysis and bioremediation. Background Art

[0002] With the rapid development of industrialization and urbanization, the problem of soil pollution has become increasingly serious. A large number of pollutants discharged by enterprises such as pesticide factories, chemical factories, electroplating factories, and textile printing and dyeing factories during the production process, such as pesticides (organophosphorus, organochlorine pesticides), volatile heavy metals (Hg), and volatile organic pollutants, etc., not only damage the soil ecology after entering the soil, but also cause serious pollution to the air and groundwater environment, threatening human health and ecological safety.

[0003] Desorption part: The contaminated soil is heated by a heating device to raise the temperature of the soil to a certain temperature (usually 200 - 500 degrees Celsius), so that volatile and semi-volatile organic pollutants and volatile heavy metals in it volatilize and separate from the soil, realizing the preliminary separation of pollutants from the soil. For example, for soil contaminated with polycyclic aromatic hydrocarbons, heating can desorb polycyclic aromatic hydrocarbons from the surface of soil particles and volatilize them into a gaseous state.

[0004] Bioremediation part: Utilize the metabolic action of microorganisms to further degrade and transform the pollutants remaining after pyrolysis and some intermediate products that may be generated during the pyrolysis process, and decompose them into harmless substances such as carbon dioxide and water, so as to achieve the purpose of thoroughly purifying the soil. For example, adding specific microbial strains to the soil, these microorganisms can use the organic pollutants in the soil as a carbon source and energy source for growth and metabolism, and gradually decompose the pollutants.

[0005] However, in the existing process of pyrolysis for soil remediation, the heating efficiency cannot be adjusted according to the soil pollution degree and the remediation stage, which will lead to poor heating effect on the soil, affecting the soil remediation, and the heat dissipation effect of the soil after heating and repairing is not good, affecting the subsequent mixing of the soil and organisms. Summary of the Invention

[0006] The embodiments of the present invention provide a combined soil purifier for pyrolysis and bioremediation to solve the problems in the prior art.

[0007] The embodiment of the present invention adopts the following technical solution: a thermal desorption and bioremediation combined soil purification machine, including a purification cylinder, wherein three legs are provided at the bottom of the purification cylinder; a circular partition is provided inside the purification cylinder, and the circular partition divides the purification cylinder into a mixing chamber and a heating chamber, and the mixing chamber is provided with a discharge pipe that passes through the heating chamber and extends to the bottom of the purification cylinder, and a remediation stirring component is provided inside the mixing chamber, and the remediation stirring component is rotatably connected to the purification cylinder, and a thermal desorption absorption component is provided inside the heating chamber, and the thermal desorption absorption component is rotatably connected to the discharge pipe, and an inlet is provided at the top of the purification cylinder, and a feed box connected thereto is provided at the top of the purification cylinder.

[0008] Furthermore, the repair stirring assembly includes a stirring motor, a stirring shaft and several stirring rods. The stirring motor is located at the top of the purification cylinder. The stirring shaft is connected to the main shaft of the stirring motor and extends into the mixing chamber. Several stirring rods are arranged on the stirring shaft at equal intervals.

[0009] Furthermore, the thermal decomposition absorption component includes a drive motor, a drive gear, a drive gear ring and a rotating ring. The drive motor is located at the bottom of the purification cylinder and the main shaft of the drive motor extends into the heating chamber. The drive gear is located on the main shaft of the drive motor. The drive gear is rotatably connected to the outer wall of the discharge pipe through a bearing. The drive gear is meshed with the drive gear ring. The rotating ring is rotatably connected to the outer wall of the discharge pipe through a bearing. Four support plates are provided on the rotating ring. Each support plate is provided with several gas heads, and each gas head is arranged toward the bottom of the partition.

[0010] Furthermore, the driving gear ring is provided with two symmetrically arranged driving electric cylinders, the telescopic ends of the driving electric cylinders are connected to the bottom of the support plate, and the driving gear ring is provided with two sliding rods, which are slidably fitted with the support plate.

[0011] Furthermore, the feed box is provided with a soil screening assembly for screening soil, and the soil screening assembly includes a rotating motor, a rotating shaft, a screening mesh plate and two driving cams. Four connecting springs are provided at the bottom of the screening mesh plate, and the screening mesh plate is connected to the feed box by sliding up and down through four connecting springs. The rotating shaft is rotatably connected to the feed box and is located below the screening mesh plate. The rotating motor is located on the outer wall of the feed box and is transmission-connected to the rotating shaft. The two driving cams are symmetrically arranged on the rotating shaft. The bottom of the screening mesh plate is provided with two driving wheels cooperating with the two driving cams, and the feed box is provided with a feed funnel.

[0012] Furthermore, a rotating circular frame is provided on the stirring shaft at the top position of the purification cylinder, and two heat dissipation fans are provided on the rotating circular frame.

[0013] Furthermore, a ventilation fan is provided at the top of the purification cylinder.

[0014] Furthermore, an exhaust gas collection and treatment device is provided at the top of the purification cylinder.

[0015] The above at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0016] First, during the pyrolysis of the soil in the present invention, the gas heads work to heat the partition plate, thereby transferring heat to the mixing cavity in the purification cylinder. During the pyrolysis process, the drive motor works to drive the drive gear to rotate, thereby driving the drive gear ring to rotate on the discharge pipe, and then driving the rotating ring to rotate on the discharge pipe, so that the positions of several gas heads on the support plate rotate at the bottom of the partition plate, enabling the heat to be evenly transported into the mixing cavity and uniformly heating the soil. When the gas heads rotate around the discharge pipe with the rotating ring, the flame coverage area expands into an annular heating zone, which can uniformly radiate heat to the soil at the entire cross-section of the bottom of the partition plate within a range of 0.5 - 2 m in radius, and the temperature difference can be controlled within ±10°C; when driving the gas heads to make a circular motion, the flame trajectory forms a continuous annular thermal field; when the soil particles are stirred and rotated on the partition plate, they can cross the flame trajectory multiple times, and the contact time is extended by 2 - 3 times, and the pyrolysis rate is increased by about 40%.

[0017] Second, during the pyrolysis of the soil in the present invention, the two drive electric cylinders work to drive the support plate to slide up and down on the two slide rods, thereby adjusting the distance between several gas heads and the partition plate; it can match the soil pollution degree and the repair stage: High-concentration pollution area: Shorten the distance between the gas heads and the purification cylinder, such as adjusting from the initial 10 cm to 5 cm, increasing the heat radiation intensity, quickly raising the soil temperature to the target range, such as 300 - 600°C, and accelerating the volatilization or decomposition of high-boiling-point pollutants, such as polychlorinated biphenyls. In the later stage of repair or low-pollution area: Increase the distance to reduce the heat input, avoid overheating and causing damage to the soil mineral structure, such as dehydration and hardening of clay minerals, and at the same time save gas energy consumption. Adapt to changes in soil thickness and accumulation state:

[0018] Thirdly, in the present invention, during the process that the stirring motor operates to drive the stirring shaft to rotate, the rotating circular frame will be driven to rotate inside the purification cylinder, and the positions of the two heat dissipation fans will be driven to rotate. During the process of dissipating heat from the soil, the two heat dissipation fans can also rotate along with the rotation of the stirring shaft. When the heat dissipation fans rotate along with the stirring shaft, the airflow blown out by them is no longer limited to a fixed direction, but forms a rotating radiation airflow field centered on the stirring shaft, covering the entire cross-section of the purification cylinder, such as the center, edge, upper layer, and lower layer, completely eliminating the airflow dead angle during static heat dissipation; the rotating fan blades can cut and disturb the airflow, forming a turbulence effect and enhancing the heat exchange efficiency between the air and the soil particles; the convective heat transfer coefficient in the turbulent state can be increased by 30% - 50% compared with the laminar state, significantly accelerating the heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a side view of the present invention;

[0022] Figure 3 is a three-dimensional structural sectional view of the present invention;

[0023] Figure 4 is a three-dimensional structural schematic diagram of the repair stirring assembly in the present invention;

[0024] Figure 5 is a three-dimensional structural schematic diagram of the pyrolysis absorption assembly in the present invention;

[0025] Figure 6 is a three-dimensional structural schematic diagram of the soil screening assembly in the present invention;

[0026] Figure 7 is Figure 6 an enlarged view of part A in

[0027] Reference numerals: purification cylinder 1, support legs 11, partition plate 12, mixing chamber 13, heating chamber 14, discharge pipe 15, inlet 16, repair stirring assembly 2, stirring motor 21, stirring shaft 22, stirring rod 23, pyrolysis absorption assembly 3, driving motor 31, driving gear 32, driving gear ring 33, rotating ring 34, support plate 35, gas burner 36, driving electric cylinder 37, sliding rod 38, feeding box 4, feeding funnel 41, soil screening assembly 5, rotating motor 51, rotating shaft 52, screening mesh plate 53, driving cam 54, connecting spring 55, driving wheel 56, rotating circular frame 57, heat dissipation fan 58, ventilation fan 6, waste gas collection and treatment device 7. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] The following will, in conjunction with the drawings, elaborate on the technical solutions of the pyrolysis and bioremediation combined soil purifier provided in each embodiment of the present invention.

[0030] Referring to Figures 1 to 7 As shown, the pyrolysis and bioremediation combined soil purifier provided in the embodiment of the present invention includes a purification cylinder 1. Three support legs 11 are provided at the bottom of the purification cylinder 1; a circular partition plate 12 is provided inside the purification cylinder 1. The circular partition plate 12 divides the inside of the purification cylinder 1 into a mixing chamber 13 and a heating chamber 14. A discharge pipe 15 passing through the heating chamber 14 and extending to the bottom of the purification cylinder 1 is provided on the mixing chamber 13. A repair stirring assembly 2 is provided inside the mixing chamber 13. The repair stirring assembly 2 is rotatably connected to the purification cylinder 1. A pyrolysis absorption assembly 3 is provided inside the heating chamber 14. The pyrolysis absorption assembly 3 is rotatably connected to the discharge pipe 15. An inlet 16 is provided at the top of the purification cylinder 1. A feeding box 4 communicating with the purification cylinder 1 is provided at the top of the purification cylinder 1.

[0031] During use, the feeding box 4 can collect the soil, perform vibration screening, crush and screen the soil, and then transport it to the inside of the purification cylinder 1. The inlet 16 can transport microorganisms and nutrient solution into the purification cylinder 1 for the bioremediation of the soil by organisms. The pyrolysis absorption assembly 3 can heat the soil for remediation. The waste gas generated during remediation is treated by the waste gas collection and treatment device 7. After the remediation of the soil is completed, the soil is discharged out through the discharge pipe 15.

[0032] Specifically, the repair stirring assembly 2 includes a stirring motor 21, a stirring shaft 22, and a plurality of stirring rods 23. The stirring motor 21 is located at the top of the purification cylinder 1. The stirring shaft 22 is connected to the main shaft of the stirring motor 21 and extends into the mixing chamber 13. A plurality of the stirring rods 23 are arranged on the stirring shaft 22 at equal intervals.

[0033] During the process of soil repair, the driving motor 31 operates to drive the stirring shaft 22 to rotate, thereby driving a plurality of stirring rods 23 to rotate, so that the soil is fully mixed and stirred with microorganisms and nutrient solution.

[0034] During the process of heating the soil, the driving motor 31 operates to drive the stirring shaft 22 to rotate, thereby driving a plurality of stirring rods 23 to rotate, so that the soil is fully stirred and heated, realizing the volatilization and separation of pollutants from the soil.

[0035] During the process of soil heat dissipation, the driving motor 31 operates to drive the stirring shaft 22 to rotate, thereby driving a plurality of stirring rods 23 to rotate, so that the soil is stirred in the purification cylinder 1, enabling the heat in the soil to be quickly discharged to the outside.

[0036] Specifically, the pyrolysis absorption assembly 3 includes a driving motor 31, a driving gear 32, a driving gear ring 33, and a rotating ring 34. The driving motor 31 is located at the bottom of the purification cylinder 1, and the main shaft of the driving motor 31 extends into the heating chamber 14. The driving gear 32 is located on the main shaft of the driving motor 31. The driving gear 32 is rotatably connected to the outer side wall of the discharge pipe 15 through a bearing. The driving gear 32 meshes with the driving gear ring 33. The rotating ring 34 is rotatably connected to the outer side wall of the discharge pipe 15 through a bearing. Four support plates 35 are provided on the rotating ring 34. A plurality of gas heads 36 are provided on each support plate 35. Each gas head 36 is arranged facing the bottom of the partition plate 12. Two symmetrically arranged driving electric cylinders 37 are provided on the driving gear ring 33. The telescopic end of the driving electric cylinder 37 is connected to the bottom of the support plate 35. Two sliding rods 38 are provided on the driving gear ring 33. The sliding rods 38 are slidably matched with the support plate 35.

[0037] During the pyrolysis of soil, the gas burner 36 operates to heat the partition plate 12, thereby transferring heat to the mixing chamber 13 inside the purification cylinder 1. During pyrolysis, the drive motor 31 operates to drive the drive gear 32 to rotate, thereby driving the drive gear ring 33 to rotate on the discharge pipe 15, and then driving the rotating ring 34 to rotate on the discharge pipe 15, so that the positions of several gas burners 36 on the support plate 35 rotate at the bottom of the partition plate 12, enabling heat to be evenly delivered into the mixing chamber 13 for uniform heating of the soil. When the gas burner 36 rotates around the discharge pipe 15 with the rotating ring 34, the flame coverage area expands into an annular heating zone, which can uniformly radiate heat to the soil at the entire cross-section of the bottom of the partition plate 12 within a radius range of 0.5 - 2 m, and the temperature difference can be controlled within ±10°C.

[0038] When driving the gas burner 36 to perform circular motion, the flame trajectory forms a continuous annular thermal field; when the soil particles are stirred and rotated on the partition plate 12, they can cross the flame trajectory multiple times, extending the contact time by 2 - 3 times and increasing the pyrolysis rate by approximately 40%.

[0039] During the pyrolysis of soil, two drive electric cylinders 37 operate to drive the support plate 35 to slide up and down on two sliding rods 38, thereby adjusting the distance between several gas burners 36 and the partition plate 12;

[0040] It can match the soil pollution degree and the repair stage:

[0041] High-concentration pollution area: Shorten the distance between the gas burner 36 and the purification cylinder 1, such as adjusting from the initial 10 cm to 5 cm, increasing the heat radiation intensity, quickly raising the soil temperature to the target range, such as 300 - 600°C, and accelerating the volatilization or decomposition of high-boiling-point pollutants such as polychlorinated biphenyls.

[0042] In the later stage of repair or low-pollution area: Increase the distance to reduce heat input, avoid overheating leading to the destruction of the soil mineral structure, such as the dehydration and hardening of clay minerals, and save gas energy consumption at the same time.

[0043] Adapt to changes in soil thickness and accumulation state:

[0044] When the soil in the purification cylinder 1 accumulates unevenly in thickness due to stirring, such as a 20% increase in the local accumulation height, the position of the gas burner 36 in the corresponding area is dynamically adjusted through the electric cylinder to ensure that the soil layers at different heights can reach the target pyrolysis temperature, avoiding incomplete repair caused by "hot spots" or "cold zones".

[0045] Specifically, a soil screening assembly 5 for screening soil is provided inside the feeding box 4. The soil screening assembly 5 includes a rotating motor 51, a rotating shaft 52, a screening mesh plate 53, and two driving cams 54. Four connecting springs 55 are provided at the bottom of the screening mesh plate 53. The screening mesh plate 53 is slidably connected up and down inside the feeding box 4 through the four connecting springs 55. The rotating shaft 52 is rotatably connected inside the feeding box 4 and is located below the screening mesh plate 53. The rotating motor 51 is located on the outer side wall of the feeding box 4 and is in transmission connection with the rotating shaft 52. The two driving cams 54 are symmetrically arranged on the rotating shaft 52. Two driving wheels 56 cooperating with the two driving cams 54 are provided at the bottom of the screening mesh plate 53. A feeding funnel 41 is provided on the feeding box 4.

[0046] After the soil is transported into the feeding box 4 through the feeding funnel 41, the rotating motor operates to drive the rotating shaft 52 to rotate, thereby driving the two driving cams 54 to rotate. The two driving cams 54 rotate on the two driving wheels 56, which will cause the screening mesh plate 53 to be driven by the four connecting springs 55, so that the screening mesh plate 53 shakes up and down inside the feeding box 4, screening the soil, shaking the soil, and crushing it; separating inert impurities such as stones, metal debris, and plastics in the soil, avoiding clogging of subsequent pyrolysis pipelines by impurities or abrasion of stirring components, while reducing the ineffective treatment amount, weakening the interaction force between soil particles, forming a loose and porous structure. The loose soil can reduce the heat conduction resistance, make the heat penetrate the soil layer more evenly, and at the same time increase the volatilization channels of pollutants. For example, VOCs can quickly escape through the pores;

[0047] During the shaking process, the soil particles jump and roll on the sieve, which can prevent fine-grained soil from sticking and clogging the sieve holes, ensuring stable screening efficiency;

[0048] Crush large soil particles >5mm to 2 - 5mm or even smaller particle sizes: During pyrolysis: The smaller the particle size, the larger the surface area per unit mass of the soil, and pollutants such as PAHs come into contact with the heat source more fully, and the volatilization rate is significantly increased;

[0049] During bioremediation: Small soil particles provide more attachment sites for microorganisms, and the contact probability between enzymes and pollutants increases. For example, in soil crushed to <2mm, the degradation rate of petroleum hydrocarbons can be 25% - 30% higher than that of the original soil.

[0050] Specifically, a rotating circular frame 57 is provided on the stirring shaft 22 at the top inside the purification cylinder 1. Two cooling fans 58 are provided on the rotating circular frame 57.

[0051] During the process of driving the stirring shaft 22 to rotate by the operation of the stirring motor 21, the rotating circular frame 57 will be driven to rotate inside the purification cylinder 1, and the positions of the two heat dissipation fans 58 will be driven to rotate. During the process of dissipating heat from the soil, the two heat dissipation fans 58 can also rotate along with the rotation of the stirring shaft 22. When the heat dissipation fan 58 rotates with the stirring shaft 22, the airflow blown out by it is no longer limited to a fixed direction, but forms a rotating radiation airflow field centered on the stirring shaft 22, covering the entire cross-section of the purification cylinder 1, such as the center, edge, upper layer, and lower layer, completely eliminating the airflow dead angle during static heat dissipation; the rotating fan blades can cut and disturb the airflow, forming a turbulence effect and enhancing the heat exchange efficiency between air and soil particles; the convective heat transfer coefficient under the turbulent state can be increased by 30% - 50% compared with the laminar state, significantly accelerating heat dissipation;

[0052] Specifically, a ventilation fan 6 is provided at the top of the purification cylinder 1. The ventilation fan 6 can provide airflow power to drive the circulation of polluted gas; the ventilation fan 6 generates negative or positive pressure airflow to push the polluted gas in the purification cylinder 1 to flow in a specific direction: when the stirring shaft 22 drives the rotating circular frame 57 to rotate, the attached stirring rod 23 can break up soil clumps, and at the same time, the airflow of the heat dissipation fan 58 directly blows towards the newly exposed high-temperature soil surface, forming a "breaking - heat dissipation" linkage effect;

[0053] The rotating ventilation fan 6 synchronously "disperses" high-concentration polluted gas, such as VOCs volatilized during the thermal desorption stage, from the dense area to the whole cylinder, and cooperates with the waste gas collection system to uniformly extract pollutants, preventing a sharp increase in the subsequent treatment load caused by excessive local concentration

[0054] During the thermal desorption stage, the ventilation fan 6 can take out the volatilized pollutants, such as VOCs and heavy metal vapors, from the soil after heating and introduce them into the waste gas collection system to ensure that the pollutants are promptly separated from the soil and improve the thermal desorption efficiency.

[0055] During the bioremediation stage, the fan can introduce fresh air or oxygen into the purification cylinder 1 to provide the oxygen required for the metabolism of microorganisms and promote their degradation of residual organic pollutants.

[0056] Adjust the environmental parameters inside the purification cylinder 1:

[0057] Control the temperature and humidity: Through air exchange by the fan, the temperature and humidity inside the purification cylinder 1 can be assisted in adjusting to avoid local overheating or excessive humidity affecting the thermal desorption effect or microbial activity.

[0058] Balance the air pressure: Prevent the gas accumulation inside the purification cylinder 1 caused by thermal desorption from leading to too high air pressure, ensure the safe operation of the equipment, and at the same time avoid gas leakage causing pollution.

[0059] Specifically, an exhaust gas collection and treatment device 7 is provided at the top of the purification cylinder 1. It should be noted that the exhaust gas collection and treatment device 7 can, during the thermal desorption process, heat the contaminated soil, usually at a temperature of 150–540 °C, to volatilize pollutants such as volatile organic compounds, semi-volatile organic compounds, and heavy metal vapors in the soil, forming exhaust gas.

[0060] During the thermal desorption process, pollutants such as volatile organic compounds and heavy metal vapors volatilized from the soil due to heat are promptly collected by this device, preventing direct discharge into the atmosphere and causing secondary pollution. The device recovers high-boiling pollutants by condensation; adsorbs low-concentration organic compounds using activated carbon; decomposes harmful substances by catalytic oxidation; removes acidic gases and water-soluble pollutants by wet scrubbing; and filters solid particles by bag dust removal. After multiple treatments, the exhaust gas meets the discharge standards, preventing pollution from spreading, improving the thermal desorption efficiency through negative pressure design, and optimizing process parameters based on exhaust gas monitoring data to ensure environmental protection and high efficiency in soil purification.

[0061] The above are only embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. Pyrolysis desorption and bioremediation combined soil purifier, characterized in that, It includes a purification cylinder (1), and three legs (11) are provided at the bottom of the purification cylinder (1); a circular partition plate (12) is provided inside the purification cylinder (1), and the circular partition plate (12) divides the inside of the purification cylinder (1) into a mixing chamber (13) and a heating chamber (14). An outlet pipe (15) that passes through the heating chamber (14) and extends to the bottom of the purification cylinder (1) is provided on the mixing chamber (13). A repair stirring assembly (2) is provided inside the mixing chamber (13), and the repair stirring assembly (2) is rotatably connected to the purification cylinder (1). A pyrolysis absorption assembly (3) is provided inside the heating chamber (14), and the pyrolysis absorption assembly (3) is rotatably connected to the outlet pipe (15). An inlet (16) is provided at the top of the purification cylinder (1), and a feeding box (4) connected to it is provided at the top of the purification cylinder (1).

2. The combined pyrolysis and bioremediation soil purifier according to claim 1, characterized in that: The repair stirring assembly (2) includes a stirring motor (21), a stirring shaft (22) and a plurality of stirring rods (23). The stirring motor (21) is located at the top of the purification cylinder (1), the stirring shaft (22) is connected to the main shaft of the stirring motor (21) and extends into the mixing chamber (13), and a plurality of the stirring rods (23) are arranged at equal intervals on the stirring shaft (22).

3. The pyrolysis desorption and bioremediation combined soil purifier according to claim 1, characterized in that: The pyrolysis absorption assembly (3) includes a driving motor (31), a driving gear (32), a driving gear ring (33) and a rotating ring (34). The driving motor (31) is located at the bottom of the purification cylinder (1) and the main shaft of the driving motor (31) extends into the heating chamber (14). The driving gear (32) is located on the main shaft of the driving motor (31), the driving gear (32) is rotatably connected to the outer side wall of the outlet pipe (15) through a bearing, the driving gear (32) meshes with the driving gear ring (33), the rotating ring (34) is rotatably connected to the outer side wall of the outlet pipe (15) through a bearing, four support plates (35) are provided on the rotating ring (34), and a plurality of gas heads (36) are provided on each of the support plates (35), and each of the gas heads (36) is arranged facing the bottom of the partition plate (12).

4. The combined pyrolysis and bioremediation soil purifier according to claim 3, characterized in that: Two symmetrically arranged driving electric cylinders (37) are provided on the driving gear ring (33), the telescopic ends of the driving electric cylinders (37) are connected to the bottom of the support plate (35), and two sliding rods (38) are provided on the driving gear ring (33), and the sliding rods (38) are slidably matched with the support plate (35).

5. The pyrolysis desorption and bioremediation combined soil purifier according to claim 1, wherein: A soil screening assembly (5) for screening soil is provided inside the feed bin (4). The soil screening assembly (5) includes a rotating motor (51), a rotating shaft (52), a screening mesh plate (53), and two driving cams (54). Four connecting springs (55) are provided at the bottom of the screening mesh plate (53). The screening mesh plate (53) is slidably connected up and down in the feed bin (4) through the four connecting springs (55). The rotating shaft (52) is rotatably connected inside the feed bin (4) and is located below the screening mesh plate (53). The rotating motor (51) is located on the outer side wall of the feed bin (4) and is in transmission connection with the rotating shaft (52). The two driving cams (54) are symmetrically arranged on the rotating shaft (52). Two driving wheels (56) cooperating with the two driving cams (54) are provided at the bottom of the screening mesh plate (53). A feed hopper (41) is provided on the feed bin (4).

6. The pyrolysis desorption and bioremediation combined soil purifier according to claim 2, wherein: A rotating circular frame (57) is provided on the stirring shaft (22) at the top inner position of the purification cylinder (1). Two heat dissipation fans (58) are provided on the rotating circular frame (57).

7. The pyrolysis desorption and bioremediation combined soil purifier according to claim 1, characterized in that: A ventilation fan (6) is provided at the top of the purification cylinder (1).

8. The pyrolysis desorption and bioremediation combined soil purifier according to claim 1, characterized in that: An exhaust gas collection and treatment device (7) is provided at the top of the purification cylinder (1).

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