Device for thermal desorption of petroleum hydrocarbon contaminated soil

Abstract

The utility model discloses a device for thermal desorption of petroleum hydrocarbon contaminated soil, which comprises a conveying bracket A. The end part of the conveying bracket A is provided with a closed conveying box A for conveying the petroleum hydrocarbon contaminated soil in a negative-pressure closed space for thermal desorption; the bottom of the conveying tail end of the closed conveying box A is provided with a closed conveying box B which forms step conveying with the closed conveying box A. A high-temperature air pipe used for conducting thermal desorption on petroleum hydrocarbon contaminated soil conveyed in the closed space is arranged on the closed conveying box A and the closed conveying box B in a penetrating mode. According to the utility model, the stepped closed conveying boxes A and B are matched with the straight chain conveying line, so that stepped thermal desorption conveying of soil is realized, and the retention time of the soil in the device is prolonged. Meanwhile, the Z-shaped high-temperature gas pipe is matched with the horn-shaped gas outlet pipe and the gas heater, so that hot gas is in all-dimensional and uniform contact with the soil, petroleum hydrocarbon pollutants in the soil are ensured to be fully volatilized or decomposed, and the thermal desorption efficiency and effect are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of soil thermal desorption technology, specifically relating to a device for thermal desorption of petroleum hydrocarbon-contaminated soil. Background Technology

[0002] With the booming development of the petrochemical industry, soil pollution from petroleum hydrocarbons is becoming increasingly serious. If petroleum hydrocarbon-contaminated soil is not treated promptly, it will not only damage the soil's ecological environment but may also harm human health through the food chain. Thermal desorption technology, as an effective method for remediating petroleum hydrocarbon-contaminated soil, has received widespread attention. This technology purifies the soil by heating the contaminated soil, causing the petroleum hydrocarbon pollutants to volatilize or decompose.

[0003] However, existing thermal desorption devices for petroleum hydrocarbon-contaminated soil have some shortcomings in practical applications. For example, the thermal desorption efficiency of some devices needs improvement, and the soil transport and heating process within the device is not uniform enough, leading to incomplete pollutant removal. Simultaneously, the treatment of gases generated during thermal desorption is inadequate, potentially causing secondary pollution. Furthermore, existing thermal desorption devices for petroleum hydrocarbon-contaminated soil employ a single heating chamber and a simple transport structure, limiting the soil's residence time and heated area within the chamber, thus affecting the thermal desorption effect. Moreover, the gas treatment system of this device only uses simple filtration devices, which cannot effectively remove dust and harmful components from the gas. Utility Model Content

[0004] The purpose of this invention is to provide an apparatus for thermal desorption of petroleum hydrocarbon-contaminated soil, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an apparatus for thermal desorption of petroleum hydrocarbon-contaminated soil, comprising:

[0006] A conveying support A is provided at one end of which a sealed conveying box A is provided for thermal desorption of petroleum hydrocarbon contaminated soil in a negative pressure sealed space. At the bottom of the conveying end of the sealed conveying box A, a sealed conveying box B is provided to form a stepped conveying system with the sealed conveying box A. High-temperature gas pipes for thermal desorption of petroleum hydrocarbon contaminated soil transported in a sealed space are provided through the sealed conveying box A and the sealed conveying box B.

[0007] The sealed conveyor box A and sealed conveyor box B are equipped with a linear conveyor line for the step thermal desorption and conveying of petroleum hydrocarbon contaminated soil. The upper end of the sealed conveyor box A is equipped with a cyclone dust collector connected to the sealed conveyor box A for gas extraction and conveying to the outside via a support frame. A vacuum pump is provided on one end of the inner side of the support frame to generate negative pressure for conveying between the sealed conveyor box A and the sealed conveyor box B.

[0008] Preferably, a speed-regulating motor is provided at one end of the sealed conveyor box A and the sealed conveyor box B, and the rotating shaft of the speed-regulating motor is connected to the rotating shaft of the transmission roller at one end of the straight chain conveyor line. For soils with different degrees of pollution, the conveying speed can be flexibly set so that the soil can fully contact the hot air, ensuring sufficient thermal desorption, effectively improving the thermal desorption efficiency, and ensuring more thorough removal of pollutants.

[0009] Preferably, the high-temperature gas pipe has a Z-shaped structure, and the bottom end of the high-temperature gas pipe is uniformly provided with a horn-shaped gas outlet pipe that penetrates to the upper part of the sealed conveying box A and the sealed conveying box B. The middle and beginning ends of the high-temperature gas pipe are provided with gas heaters, and one end of the gas heater is connected to a blower installed on the upper end of the sealed conveying box B through a gas pipe. This can stably provide high-temperature hot gas, ensure that the thermal desorption process is carried out continuously and efficiently, thereby improving the overall thermal desorption efficiency and allowing petroleum hydrocarbon pollutants in the soil to be more fully volatilized or decomposed.

[0010] Preferably, temperature sensors are installed on the inner sides of both sealed conveyor boxes A and B, as well as at both ends of the high-temperature gas pipe. A control box with a built-in PLC is located at the front exterior of sealed conveyor box A. This control box is connected to the sensors, motor, fan, and pump body heating control within the device, automatically adjusting the operating status of the motor, fan, pump body, and heating device. When the temperature is too high, the heating power is reduced or the ventilation volume is increased; when the temperature is too low, the heating power is increased, ensuring that the thermal desorption process is always under optimal temperature conditions. This achieves precise control, effectively improving thermal desorption efficiency and stability, and avoiding incomplete pollutant removal due to improper temperature control.

[0011] Preferably, the contact end between the sealed conveyor box A and the sealed conveyor box B is provided with a through-hole for feeding, and the bottom of the end of the sealed conveyor box B is provided with a discharge pipe. The bottom of the sealed conveyor box B is provided with a conveying support B, which prolongs the contact time between the soil and the hot air, helps to improve the thermal desorption efficiency, and also facilitates the collection and subsequent processing of the treated soil.

[0012] Preferably, the cyclone dust collector is fixed on a support frame, and the support frame is mounted on the upper end of the sealed conveying box A, which effectively solves the problem of secondary pollution caused by imperfect gas treatment in the background art. At the same time, the compact structural design also saves the equipment floor space.

[0013] Preferably, the cyclone dust collector includes an air inlet, a cylinder, a cone, a dust collection hopper, and an air outlet. The air inlet is located on the side of the cylinder, and the air outlet is located on the top of the cylinder. This design can efficiently separate dust particles from the gas, greatly improve the gas purification effect, reduce dust emissions, reduce the risk of secondary pollution, and ensure the environmental friendliness of the thermal desorption process.

[0014] Preferably, the cylinder, cone, and dust collection hopper are connected sequentially from top to bottom, and the structure also includes an airflow deceleration hood disposed inside the cylinder; the airflow deceleration hood includes a cylindrical hood and a tripod disposed at the bottom of the hood, the tripod includes three legs, the bottom ends of the legs are fixedly connected to the inner wall of the cone, and the hood has evenly spaced circular holes. The airflow deceleration hood can slow down the gas flow rate, allowing dust particles more time to separate from the gas under centrifugal force and fall into the dust collection hopper.

[0015] Preferably, a blower is provided on one side of the end of the support frame to draw out the gas, and the air inlet of the cyclone dust collector is connected to the upper side of the sealed conveying box A through a pipe. The end of the sealed conveying box A is provided with a feed hopper, which avoids the accumulation of gas in the device and effectively solves the problems of imperfect gas treatment and poor conveying in the prior art. At the same time, it also improves the convenience of soil delivery and enhances the overall working efficiency and practicality of the device.

[0016] Compared with existing technologies, the technical effects and advantages of this utility model are as follows: This device for thermal desorption of petroleum hydrocarbon-contaminated soil...

[0017] This invention achieves stepped thermal desorption and conveying of soil by combining stepped sealed conveyor boxes A and B with a straight-chain conveyor line, thus extending the residence time of the soil within the device. Simultaneously, a Z-shaped high-temperature gas pipe, paired with a horn-shaped gas outlet pipe and a gas heater, ensures that the hot gas contacts the soil comprehensively and evenly, guaranteeing the full volatilization or decomposition of petroleum hydrocarbon pollutants in the soil, significantly improving the efficiency and effectiveness of thermal desorption.

[0018] This invention incorporates temperature sensors in a sealed conveyor box and a high-temperature gas pipe, and uses a built-in PLC control box to intelligently regulate the motor, fan, pump, and heating device. Based on real-time temperature data, the system automatically adjusts the equipment's operating and dwell states, maintaining optimal temperature conditions during the thermal desorption process. This prevents incomplete pollutant removal due to improper temperature control, achieving precise and efficient thermal desorption operations.

[0019] This invention establishes a comprehensive gas handling system. The unique structural design of the cyclone dust collector, combined with an airflow deceleration shroud, efficiently separates dust particles from the gas. Combined with a vacuum pump and induced draft fan, it ensures that the gas generated by thermal desorption is processed and transported in a timely and stable manner. This optimized process, from gas collection to purification and emission, significantly reduces the risk of secondary pollution and ensures the environmental friendliness and safety of the thermal desorption process. Attached Figure Description

[0020] Figure 1 This is a front internal view of the sealed conveyor box of this utility model;

[0021] Figure 2 This is a front view of the apparatus for thermal desorption of petroleum hydrocarbon-contaminated soil according to this utility model.

[0022] Figure 3 This is the internal view of the cyclone dust collector of this utility model.

[0023] In the diagram: 1. Conveyor support A; 2. Enclosed conveyor box A; 3. Enclosed conveyor box B; 5. High-temperature gas pipe; 6. Straight chain conveyor line; 7. Support frame; 8. Cyclone dust collector; 9. Vacuum pump; 10. Speed-regulating motor; 11. Horn-shaped exhaust pipe; 12. Gas heater; 13. Inlet fan; 14. Temperature sensor; 15. Control box; 16. Connecting discharge port; 17. Discharge pipe; 18. Air inlet; 19. Cylinder; 20. Cone; 21. Dust collection hopper; 22. Exhaust port; 23. Cover; 24. Tripod; 25. Conveyor support B; 26. Round hole; 27. Exhaust fan; 28. Feed hopper. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3 This utility model provides a technical solution: a device for thermal desorption of petroleum hydrocarbon-contaminated soil, comprising:

[0026] The conveying support A1 is welded from high-strength steel, possessing excellent stability and load-bearing capacity to support the operation of the entire device. At its end is a sealed conveying box A2 for thermal desorption of petroleum hydrocarbon-contaminated soil within a negative pressure, enclosed space. Sealed conveying box A2 is made of high-temperature resistant and corrosion-resistant alloy steel plate with a wall thickness of 8-10mm, ensuring excellent airtightness and thermal insulation, effectively preventing heat loss and gas leakage. At the bottom of the conveying end of sealed conveying box A2 is a sealed conveying box B3, forming a stepped conveying system with sealed conveying box A2. Sealed conveying box B3 has the same structure and material as sealed conveying box A2, and the two are connected by a precise welding process to ensure a tight seal at the connection. The sealed conveyor boxes A2 and B3 are equipped with high-temperature gas pipes 5 for thermal desorption of petroleum hydrocarbon contaminated soil transported in a sealed space. The high-temperature gas pipes 5 are made of seamless high-temperature resistant alloy steel pipes with a diameter of 200-300mm, which can withstand high temperature and high pressure environments and ensure stable hot gas delivery.

[0027] The sealed conveyor boxes A2 and B3 are equipped with a linear conveyor line 6 for the stepped thermal desorption and conveying of petroleum hydrocarbon-contaminated soil. The linear conveyor line 6 consists of a high-strength chain, wear-resistant rollers, and a drive unit. The chain has a load-bearing capacity of 5-8 tons, enabling stable conveying of large quantities of soil. The roller surface undergoes special treatment, providing excellent wear resistance and corrosion resistance, reducing soil wear on the rollers. At the upper end of the sealed conveyor box A2, a cyclone dust collector 8 is connected to the sealed conveyor box A2 via a support frame 7 for gas extraction and conveying to the outside. The support frame 7 uses a steel frame structure, possessing high strength and rigidity, and can stably support the cyclone dust collector 8. A vacuum pump 9 is located on one end of the inner side of the support frame 7, creating negative pressure for conveying between the sealed conveyor boxes A2 and B3. The vacuum pump 9 is a high-vacuum, high-flow model, with a pumping speed of 500-1000 m³ / h. 3 / h, which can quickly and effectively create a stable negative pressure environment inside the chamber.

[0028] A speed-regulating motor 10 is installed at one end of the exterior of both the sealed conveyor box A2 and the sealed conveyor box B3. The speed-regulating motor 10 adopts frequency conversion speed regulation technology, with a speed range of 0-10 r / min, and the speed can be flexibly adjusted according to the degree of soil pollution and treatment requirements. Furthermore, the rotating shaft of the speed-regulating motor 10 is connected to the drive roller shaft at one end of the straight chain conveyor line 6 through a coupling to ensure the stability and reliability of power transmission.

[0029] The high-temperature gas pipe 5 has a Z-shaped structure. This design increases the flow path of hot air within the sealed conveying box, ensuring sufficient contact between the hot air and the soil. Furthermore, the bottom of the high-temperature gas pipe 5 is uniformly equipped with flared outlet pipes 11 that penetrate to the upper part of the sealed conveying boxes A2 and B3. The opening angle of the flared outlet pipes 11 is 60-90 degrees, increasing the diffusion area of ​​the hot air and ensuring uniform distribution within the boxes. Gas heaters 12 are installed at the middle and beginning of the high-temperature gas pipe 5. These gas heaters 12 use electric heating with a heating power of 50-100kW, capable of rapidly heating the air to the required temperature. One end of the gas heater 12 is connected via a gas pipe to an intake fan 13 installed at the upper part of the sealed conveying box B3. The intake fan 13 is a low-noise, high-pressure centrifugal fan with an air volume of 2000-3000m³. 3 / h, which can stably provide sufficient air for gas heater 12.

[0030] Temperature sensors 14 are installed on the inner sides of sealed conveyor boxes A2 and B3, as well as at both ends of the high-temperature gas pipe 5. These temperature sensors 14 are high-precision thermocouple sensors with a measurement accuracy of ±1℃, enabling real-time and accurate temperature monitoring at various points. Furthermore, a control box 15 with a built-in PLC is located at the front of the sealed conveyor box A2. The control box 15 is waterproof and dustproof, and integrates an advanced PLC control system and various electrical components. The control box 15 is connected to the sensors, motors, fans, and pump heating control within the device, achieving automated control and precise adjustment of the entire device through preset programs and algorithms.

[0031] A connecting discharge port 16 is provided at the contact end between the sealed conveyor box A2 and the sealed conveyor box B3. The size of the connecting discharge port 16 is designed according to the width of the straight chain conveyor line 6 and the soil conveying requirements to ensure that the soil can smoothly enter the sealed conveyor box B3 from the sealed conveyor box A2. Furthermore, a discharge pipe 17 is provided at the bottom of the sealed conveyor box B3. The discharge pipe 17 is made of a large-diameter seamless steel pipe with a diameter of 300-400mm to facilitate the rapid discharge of treated soil. A conveying support B25 is provided at the bottom of the sealed conveyor box B3.

[0032] The cyclone dust collector 8 is fixed on the support frame 7, which is mounted on the upper end of the sealed conveyor box A2. The cyclone dust collector 8 includes an inlet 18, a cylinder 19, a cone 20, a dust collection hopper 21, and an outlet 22. The inlet 18 is located on the side of the cylinder 19, and its size is designed according to the gas flow rate and velocity to ensure that the gas can smoothly enter the dust collector. The outlet 22 is located at the top of the cylinder 19 and adopts a special windproof and rainproof design to prevent external debris from entering the dust collector.

[0033] The cylinder 19, cone 20, and dust collection hopper 21 are connected sequentially from top to bottom. The structure also includes an airflow deceleration shroud installed inside the cylinder 19. The airflow deceleration shroud comprises a cylindrical shroud 23 and a tripod 24 at the bottom of the shroud 23. The tripod 24 has 2-4 legs made of high-strength stainless steel, and its bottom end is welded to the inner wall of the cone 20 to ensure structural stability. Circular holes 26, with a diameter of 10-15mm, are evenly distributed on the shroud, effectively slowing the airflow while ensuring smooth gas passage.

[0034] A blower 27 is installed on one side of the support frame 7 to draw out the gas. The blower 27 is an explosion-proof fan with a power of 15-20kW and a wind pressure of 3000-4000Pa, which can stably draw out the gas processed by the cyclone dust collector 8. The air inlet 18 of the cyclone dust collector 8 is connected to the upper side of the sealed conveying box A2 through a pipe. The pipe is made of high-temperature resistant and corrosion-resistant rubber hose, which has good flexibility and sealing performance. A feed hopper 28 is installed through the end of the sealed conveying box A2. The feed hopper 28 has an inverted cone design with a large opening to facilitate the feeding of soil. At the same time, a guide plate is installed inside the feed hopper 28 to guide the soil to enter the sealed conveying box A2 evenly.

[0035] Specifically, during use, petroleum hydrocarbon-contaminated soil enters the sealed conveyor box A2 via the feed hopper 28 and begins to be conveyed under the drive of the linear conveyor line 6. The blower 13 sends air into the gas heater 12 for heating, and the high-temperature gas is blown evenly into the sealed conveyor boxes A2 and B3 through the Z-shaped high-temperature gas pipe 5 and the horn-shaped gas outlet pipe 11 to perform thermal desorption treatment on the soil, promoting the volatilization or decomposition of petroleum hydrocarbon pollutants in the soil.

[0036] After thermal desorption in the sealed conveyor box A2, the soil enters the sealed conveyor box B3 through the connecting discharge port 16. It continues to be conveyed and undergoes secondary thermal desorption under the action of the linear conveyor line 6, and is finally discharged from the discharge pipe 17. The dust-laden gas generated during the thermal desorption process is extracted from the sealed conveyor box A2 by the vacuum pump 9 and sent to the cyclone dust collector 8 through a pipeline. The dust-laden gas enters the cylinder 19 of the cyclone dust collector 8 through the air inlet 18. Under the action of centrifugal force, the dust particles are thrown against the cylinder wall and fall into the dust collection hopper 21. The purified gas is discharged from the exhaust port 22 and drawn out of the device by the induced draft fan 27.

[0037] Temperature sensors 14 are installed inside the sealed conveying boxes A2 and B3, as well as at both ends of the high-temperature gas pipe 5. These sensors monitor the temperature at each location in real time and transmit the data to the control box 15 with a built-in PLC. The control box 15 precisely regulates the heating and ventilation components in the device according to preset temperature parameters. When the temperature sensor 14 detects a temperature higher than the preset value, the control box 15 controls the gas heater 12 to reduce its heating power while increasing the ventilation volume of the intake fan 13 to accelerate the flow of hot air and lower the temperature inside the box. When the temperature is lower than the preset value, the control box 15 controls the gas heater 12 to increase its heating power and reduces the ventilation volume of the intake fan 13, causing the temperature inside the box to rise again. Through this closed-loop feedback control mechanism, the thermal desorption process is always maintained at the optimal temperature conditions, ensuring that petroleum hydrocarbon pollutants in the soil are fully volatilized or decomposed, thus improving the thermal desorption efficiency and stability.

[0038] The rotating shaft of the variable-speed motor 10 is connected to the drive roller shaft at one end of the linear conveyor line 6. The operator can flexibly set the speed of the variable-speed motor 10 in the control box 15 according to the degree of soil pollution. For soil with a high degree of pollution, the operating speed of the linear conveyor line 6 is reduced to prolong the residence time of the soil in the sealed conveyor boxes A2 and B3, so that the soil has more contact time with the hot air and ensures sufficient thermal desorption. For soil with a low degree of pollution, the operating speed of the linear conveyor line 6 is appropriately increased to improve the processing efficiency of the device while ensuring the thermal desorption effect, ensuring more thorough removal of pollutants, and achieving personalized and efficient treatment of soil with different degrees of pollution.

[0039] The vacuum pump 9 creates a slightly negative pressure environment inside the sealed conveying boxes A2 and B3. Under this environment, material conveying offers several advantages. First, the slightly negative pressure promotes the rapid flow of gas generated during thermal desorption towards the extraction direction, accelerating gas discharge and preventing gas accumulation inside the boxes, thus ensuring the smooth progress of the thermal desorption process. Second, the slightly negative pressure environment effectively prevents gas leakage inside the boxes. Because the external air pressure is higher than the internal air pressure, even with tiny gaps in the device, gas will not escape, thereby preventing the emission of gases containing petroleum hydrocarbon pollutants into the environment and reducing pollution to the surrounding area. Third, the slightly negative pressure helps the hot gas to be distributed more evenly within the sealed conveying boxes, allowing for better contact between the hot gas and the soil, further improving thermal desorption efficiency.

[0040] The cyclone dust collector 8 features a unique structural design, including an air inlet 18, a cylinder 19, a cone 20, a dust collection hopper 21, and an airflow deceleration hood inside the cylinder, which efficiently separates dust particles from the gas. After the dust-laden gas enters the cylinder 19, the dust particles are thrown against the cylinder wall under centrifugal force. The airflow deceleration hood slows down the gas flow rate, allowing the dust particles more time to separate from the gas and fall into the dust collection hopper 21, significantly reducing the dust content in the discharged gas.

[0041] The device's fully enclosed design, combined with its micro-negative pressure operation, eliminates the possibility of flammable and explosive gas leakage at its source. Because the internal pressure is lower than the external pressure, even if the device is accidentally damaged, external air will flow inwards, preventing the leakage of internal flammable and explosive gases and reducing the risk of explosion. Furthermore, the tight connections and excellent sealing of all components further enhance its explosion-proof and leak-proof performance, ensuring the safety of the device during operation.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for thermal desorption of petroleum hydrocarbon contaminated soil, characterized by, include: A conveying support A (1) is provided at the end of the conveying support A (1) for thermal desorption of petroleum hydrocarbon contaminated soil in a negative pressure closed space. At the bottom of the conveying end of the closed conveying support A (2) is a closed conveying box B (3) that forms a stepped conveying with the closed conveying box A (2). A high-temperature gas pipe (5) for thermal desorption of petroleum hydrocarbon contaminated soil in a closed space is provided through the closed conveying box A (2) and the closed conveying box B (3). The sealed conveyor box A (2) and the sealed conveyor box B (3) are equipped with a straight-chain conveyor line (6) for step thermal desorption and conveying of petroleum hydrocarbon contaminated soil. The upper end of the sealed conveyor box A (2) is equipped with a cyclone dust collector (8) that is connected to the sealed conveyor box A (2) for gas extraction and conveying to the outside via a support frame (7). The inner end of the support frame (7) is equipped with a vacuum pump (9) that generates negative pressure for conveying between the sealed conveyor box A (2) and the sealed conveyor box B (3).

2. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: The sealed conveyor box A (2) and the sealed conveyor box B (3) are equipped with a speed-regulating motor (10) at one end of their exterior, and the rotating shaft of the speed-regulating motor (10) is connected to the rotating shaft of the transmission roller at one end of the straight chain conveyor line (6).

3. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: The high-temperature gas pipe (5) has a Z-shaped structure, and the bottom end of the high-temperature gas pipe (5) is uniformly provided with a horn-shaped gas outlet pipe (11) that penetrates into the upper part of the sealed conveying box A (2) and the sealed conveying box B (3). The middle and beginning ends of the high-temperature gas pipe (5) are provided with gas heaters (12), and one end of the gas heater (12) is connected to an air intake fan (13) installed at the upper end of the sealed conveying box B (3) through a gas pipe.

4. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: Temperature sensors (14) are provided on the inner sides of the sealed conveying box A (2) and the sealed conveying box B (3) as well as at both ends of the high-temperature gas pipe (5). A control box (15) with a built-in PLC is provided at the front end of the sealed conveying box A (2). The control box (15) is connected to the sensors, motor, fan and pump body heating control in the device.

5. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: The contact end between the sealed conveyor box A (2) and the sealed conveyor box B (3) is provided with a through-hole (16), and the bottom of the sealed conveyor box B (3) is provided with a discharge pipe (17), and the bottom of the sealed conveyor box B (3) is provided with a conveying support B (25).

6. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: The cyclone dust collector (8) is fixed on the support frame (7), and the support frame (7) is mounted on the upper end of the sealed conveyor box A (2).

7. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 1, characterized in that: The cyclone dust collector (8) includes an air inlet (18), a cylinder (19), a cone (20), a dust collection hopper (21), and an air outlet (22). The air inlet (18) is located on the side of the cylinder (19), and the air outlet (22) is located on the top of the cylinder (19).

8. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 7, characterized in that: The cylinder (19), cone (20), and dust collection hopper (21) are connected in sequence from top to bottom. The structure also includes an airflow deceleration hood set inside the cylinder (19). The airflow deceleration hood includes a cylindrical hood (23) and a tripod (24) set at the bottom of the hood (23). The tripod (24) includes 2-4 legs. The bottom end of the legs is fixedly connected to the inner wall of the cone (20). Circular holes (26) are evenly opened on the hood.

9. The apparatus for thermal desorption of petroleum hydrocarbon contaminated soil according to claim 8, characterized in that: The support frame (7) is provided with a blower (27) to draw out the gas on one side of the end. The air inlet (18) of the cyclone dust collector (8) is connected to the upper side of the sealed conveying box A (2) through a pipe, and the end of the sealed conveying box A (2) is provided with a feed hopper (28).

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