Multi-stage heating movable thermal desorption soil remediation device

Abstract

The invention relates to the technical field of multi-stage heating soil remediation devices, and discloses a multi-stage heating movable thermal desorption soil remediation device which comprises a first-stage heating mechanism, a second-stage heating mechanism, a stirring mechanism, a material conveying mechanism, a third-stage heating mechanism, a gas guide mechanism and a controller. The third-stage heating mechanism is connected with the first-stage heating mechanism through a material conveying mechanism, the first-stage heating mechanism comprises a first heating box, three first conveying belts are installed on the inner side wall of the first heating box from top to bottom, a plurality of hollow pipes are installed on the inner bottom face of the first heating box, and hollow circular plates fixedly communicate with the upper surfaces of the hollow pipes; a plurality of through holes are formed in the outer side face of the hollow circular plate, a steam pipe is arranged in the bottom end of the first heating box, and an inner containing cavity of the steam pipe communicates with the hollow pipe; through cooperation of the structures, multi-stage thermal desorption is carried out on soil, and the thermal desorption effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-stage heating soil remediation devices, and in particular relates to a multi-stage heating mobile thermal desorption soil remediation device. Background Art

[0002] The rapid development of industry and industrial adjustment have mostly formed organic soil pollution mainly composed of semi-volatile organic compounds such as polycyclic aromatic hydrocarbons and petroleum hydrocarbons. The pollutants have the characteristics of "three-hazard" toxicity, difficulty in degradation and easy deposition. The resulting ecological and environmental risks seriously threaten the healthy development of human society. The remediation and reuse of organically contaminated soil is an issue that needs to be urgently addressed.

[0003] In the prior art, most of the methods for thermal desorption of soil are primary heating methods, which may not fully meet the treatment requirements of all types of pollutants. Due to the differences in soil characteristics and pollutant composition, the primary heating method may not be suitable for all types of soils and pollutants. For example, for some clay and silt soils, as well as soils with high humus content, due to their strong binding force with pollutants, the primary heating method may require a longer reaction time, and may not even achieve the ideal remediation effect, and the thermal desorption effect on the soil is poor.

[0004] To this end, we propose a mobile thermal desorption soil remediation device with multi-stage heating. Summary of the invention

[0005] The purpose of the present invention is to provide a mobile thermal desorption soil remediation device with multi-stage heating in order to perform multi-stage thermal desorption on soil and improve the thermal desorption effect.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A mobile thermal desorption soil remediation device with multi-stage heating, comprising a primary heating mechanism, a secondary heating mechanism, a stirring mechanism, a feeding mechanism, a tertiary heating mechanism, an air guide mechanism and a controller, wherein the secondary heating mechanism is arranged on the upper surface of the left end of the primary heating mechanism, the tertiary heating mechanism is connected to the primary heating mechanism through the feeding mechanism, the primary heating mechanism comprises a heating box 1, the inner side wall of the heating box 1 is provided with three conveyor belts 1 from top to bottom, a plurality of hollow tubes are installed on the inner bottom surface of the heating box 1, a hollow circular plate is fixedly connected to the upper surface of the hollow tube, a plurality of through holes are provided on the outer side surface of the hollow circular plate, a steam pipe is provided inside the bottom end of the heating box 1, and the inner volume of the steam pipe is connected to the hollow tube;

[0008] The number of the stirring mechanisms is several, and the stirring mechanisms include a motor 1, the motor 1 is fixedly connected to the front side of the heating box 1 close to the conveyor belt 1, the output end of the motor 1 is fixedly connected to a rotating rod 1, and the end of the rotating rod 1 away from the motor 1 is rotatably connected to the inner wall of one side of the heating box 1 through a bearing;

[0009] The secondary heating mechanism includes a heating box 2, which is fixedly connected to the upper surface of the heating box 1, and the internal volume of the heating box 2 is connected to the upper internal volume of the heating box 1, a feed pipe is installed on the upper surface of the left end of the heating box 2, a bell mouth is fixedly connected to the upper surface of the feed pipe, a feed valve is installed on the outer surface of the feed pipe, a conveyor belt 2 is installed on the inner bottom surface of the heating box 2, and a plurality of microwave generators are installed on the inner wall of the top end of the heating box 2.

[0010] In a preferred embodiment of the invention, the feeding mechanism includes a cylinder, which is fixedly connected to the right side of the heating box one, the internal volume cavity at the bottom end of the cylinder is connected to the internal volume cavity at the bottom end of the heating box one, the top inner wall of the cylinder is fixedly connected to a motor two, the output end of the motor two is fixedly connected to a rotating rod two, the outer surface of the rotating rod two is fixedly connected to an auger blade, and the upper internal volume cavity of the cylinder is connected to a feeding pipe.

[0011] In a preferred embodiment of the invention, the three-stage heating mechanism includes a heating box three, the end of the feed pipe away from the cylinder is connected to the upper internal volume cavity of the heating box three, two conveyor belts three are installed on the inner side wall of the heating box three, and a plurality of conductive electrodes are installed on the inner side wall of the heating box three close to the upper surface of the conveyor belt three, and the conductive electrodes are electrically connected to an external power supply.

[0012] In a preferred embodiment of the invention, the inner volume cavity at the bottom end of the heating box 3 is fixedly connected to a discharge pipe, and a discharge valve is installed on the outer surface of the discharge pipe.

[0013] In a preferred embodiment of the invention, the air guide mechanism includes an exhaust pipe, the upper internal volume cavity of the heating box three is connected to a manifold three, and the end of the manifold three away from the heating box three is connected to the exhaust pipe, the upper internal volume cavity of the heating box one is connected to a manifold one, and the end of the manifold one away from the heating box one is connected to the exhaust pipe, the upper internal volume cavity of the heating box two is connected to a manifold two, and the end of the manifold two away from the heating box two is connected to the exhaust pipe, and an exhaust valve is installed on the outer surface of the left end of the exhaust pipe.

[0014] In a preferred embodiment of the invention, the inner cavity at the left end of the steam pipe is fixedly connected to an air intake pipe, and an electromagnetic valve is installed on the outer surface of the air intake pipe.

[0015] In a preferred embodiment of the invention, a temperature sensor is installed in the middle of the top inner wall of the heating box one and the heating box two, the controller is installed on the upper surface of the heating box one, and the output end of the temperature sensor is electrically connected to the heating box two, and the output end of the controller is electrically connected to the solenoid valve, the microwave generator and the motor one.

[0016] In a preferred embodiment of the invention, a material guiding oblique block is fixedly connected to the inner bottom surface of the heating box close to the cylinder, and the upper surface of the material guiding oblique block is inclined from all sides toward the lower end opening of the cylinder.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1. In the present invention, after the soil to be thermally desorbed is placed into the interior of the second heating box through the bell mouth and the feed pipe, the soil will fall onto the upper surface of the second conveyor belt and be transported to the interior of the first heating box. At this time, the microwave generator is started to perform microwave heating treatment on the soil containing pollutants, so as to cause the water molecules in the soil to vibrate and generate heat energy, thereby increasing the soil temperature. As the temperature increases, the organic pollutants and certain heavy metals in the soil will be volatilized by heat and separated from the soil; then, the soil is heated again by the first-stage heating mechanism and the third-stage heating mechanism so as to thermally desorb the soil again; through the cooperation of the above structures, the soil is thermally desorbed in multiple stages to improve the thermal desorption effect.

[0019] 2. In the present invention, the soil after the initial thermal desorption by the secondary heating mechanism will be moved and transported to the inside of the heating box. The soil entering the heating box will fall onto the upper surface of the conveyor belt. The uppermost conveyor belt will slowly be transported to the lowermost conveyor belt. At this time, the hot steam will be released from the through hole after passing through the steam pipe, the hollow pipe and the hollow circular plate and slowly move upward to heat the soil transported by the conveyor belt. At the same time, the motor is started to make the rotating rod drive the stirring blade to rotate so as to stir the soil transported by the conveyor belt, so as to make the heating more uniform and improve the thermal desorption effect. Then, the feeding mechanism is used to transport the soil to the tertiary heating mechanism for thermal desorption again. The soil is subjected to multi-stage thermal desorption through the cooperation of the above structures to improve the thermal desorption effect.

[0020] 3. In the present invention, when the soil is transported to the interior of the heating box three by the feeding mechanism, the motor two is started to make the rotating rod two drive the auger blades to rotate, so as to transport the soil at the bottom of the heating box one from the cylinder and the feeding pipe to the interior of the heating box three. The soil entering the interior of the heating box three will fall onto the upper surface of the conveyor belt three for transportation. At this time, the high-frequency current is precisely controlled to be transmitted between the conductive electrodes by using the power control system. In this process, the high-frequency current will generate electromagnetic waves. When these electromagnetic waves propagate in the soil, they will interact with the soil particles and the pollutants therein. When the electromagnetic waves propagate in the soil, they will be converted into heat energy, so that the soil temperature rises rapidly, heating the soil particles and the pollutants therein, thereby realizing thermal desorption. The soil is subjected to multi-stage thermal desorption through the cooperation of the above structures, thereby improving the thermal desorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the present invention;

[0022] Figure 2 It is a three-dimensional diagram of the primary heating mechanism and the secondary heating mechanism in the present invention;

[0023] Figure 3 It is a cross-sectional view of the primary heating mechanism and the secondary heating mechanism in the present invention;

[0024] Figure 4 The present invention Figure 1 A magnified image of point A;

[0025] Figure 5 It is a cross-sectional view of the feeding mechanism and the three-stage heating mechanism in the present invention.

[0026] Explanation of reference numerals: 1-primary heating mechanism; 2-secondary heating mechanism; 3-stirring mechanism; 4-feeding mechanism; 5-third-stage heating mechanism; 6-air guiding mechanism; 7-controller; 11-heating box 1; 12-conveyor belt 1; 13-steam pipe; 14-hollow pipe; 15-hollow circular plate; 16-through hole; 17-inlet pipe; 18-solenoid valve; 19-material guiding inclined block; 21-heating box 2; 22-conveyor belt 2; 23-microwave generator; 24-temperature sensor ; 25-feed pipe; 26-bellows; 27-feed valve; 31-motor one; 32-rotating rod one; 33-stirring blade one; 41-barrel; 42-motor two; 43-rotating rod two; 44-auger blade; 45-feed pipe; 51-heating box three; 52-conveyor belt three; 53-conductive electrode; 54-discharge pipe; 55-discharge valve; 61-exhaust pipe; 62-manifold one; 63-manifold two; 64-manifold three; 65-exhaust valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The following will be combined Figure 1-Figure 5 A mobile thermal desorption soil remediation device with multi-stage heating according to an embodiment of the present invention is described in detail.

[0029] Reference Figure 1-5 ,

[0030] Example:

[0031] Reference Figure 1-Figure 5 A mobile thermal desorption soil remediation device with multi-stage heating includes a primary heating mechanism 1, a secondary heating mechanism 2, a stirring mechanism 3, a feeding mechanism 4, a tertiary heating mechanism 5, an air guide mechanism 6 and a controller 7. The secondary heating mechanism 2 is arranged on the upper surface of the left end of the primary heating mechanism 1, and the tertiary heating mechanism 5 is connected to the primary heating mechanism 1 through the feeding mechanism 4. The primary heating mechanism 1 includes a heating box 11, and the inner side wall of the heating box 11 is provided with three conveyor belts 12 from top to bottom. The secondary heating mechanism 2 includes a heating box 21, and the heating box 21 is fixedly connected to the upper surface of the heating box 11, and the internal volume of the heating box 21 is connected to the upper internal volume of the heating box 11. A feeding pipe 25 is installed on the upper surface of the left end of the heating box 21, and a bell mouth 26 is fixedly connected to the upper surface of the feeding pipe 25, and a feeding pipe 25 is installed on the outer surface of the feeding pipe 25. Valve 27, a conveyor belt 22 is installed on the inner bottom surface of the heating box 21, and a plurality of microwave generators 23 are installed on the inner wall of the top of the heating box 21; specifically, the feed valve 27 is opened, and the soil to be thermally desorbed is placed from the bell mouth 26 and the feed pipe 25 into the interior of the heating box 21, and the soil will fall to the upper surface of the conveyor belt 22 and be transported to the interior of the heating box 11. At this time, the microwave generator 23 is started to perform microwave heating treatment on the soil containing pollutants, so as to promote the vibration of water molecules in the soil, generate heat energy, and then increase the temperature of the soil. As the temperature rises, the organic pollutants and certain heavy metals in the soil will volatilize due to the heat and separate from the soil; then it is heated again by the first-level heating mechanism 1 and the third-level heating mechanism 5, so as to thermally desorb the soil again; through the cooperation of the above structures, the soil is thermally desorbed in multiple stages to improve the thermal desorption effect.

[0032] Reference Figure 1-Figure 5A plurality of hollow tubes 14 are installed on the inner bottom surface of the heating box 11, and a hollow circular plate 15 is fixedly connected to the upper surface of the hollow tube 14. A plurality of through holes 16 are provided on the outer side of the hollow circular plate 15. A steam pipe 13 is provided inside the bottom end of the heating box 11, and the internal volume of the steam pipe 13 is connected to the hollow tube 14; an air inlet pipe 17 is fixedly connected to the internal volume of the left end of the steam pipe 13, and a solenoid valve 18 is installed on the outer surface of the air inlet pipe 17; specifically, the soil after the initial thermal desorption by the secondary heating mechanism 2 will be moved and transported to the interior of the heating box 11, and the soil entering the interior of the heating box 11 will fall to the upper surface of the conveyor belt 12, and the uppermost conveyor belt 12 will slowly move to the lowermost conveyor belt 12. The conveyor belt 12 of the layer is transported. At this time, the steam transport pipeline is connected to the air inlet pipe 17, and the solenoid valve 18 is opened. The transported hot steam will pass through the steam pipe 13, the hollow pipe 14 and the hollow circular plate 15, and then disperse from the through hole 16 and slowly move upward, so as to heat the soil transported by the conveyor belt 12. At the same time, the motor 31 is started to make the rotating rod 32 drive the stirring blade 33 to rotate, so as to stir the soil transported by the conveyor belt 12, so as to make the heating more uniform and improve the thermal desorption effect. Then, the feeding mechanism 4 is used to transport the soil to the third-level heating mechanism 5 for thermal desorption again. Through the cooperation of the above structures, the soil is subjected to multi-stage thermal desorption to improve the thermal desorption effect.

[0033] Reference Figure 1-Figure 5 The feeding mechanism 4 includes a cylinder 41, which is fixedly connected to the right side of the heating box 11, the internal cavity at the bottom end of the cylinder 41 is connected to the internal cavity at the bottom end of the heating box 11, the inner wall of the top end of the cylinder 41 is fixedly connected to a motor 42, the output end of the motor 42 is fixedly connected to a rotating rod 43, the outer surface of the rotating rod 43 is fixedly connected to an auger blade 44, and the upper internal cavity of the cylinder 41 is connected to a feeding pipe 45; the inner bottom surface of the heating box 11 close to the cylinder 41 is fixedly connected to a material guide inclined block 19, and the upper surface of the material guide inclined block 19 is inclined from all sides to the lower end opening of the cylinder 41; specifically, when the soil is transported to the third-level heating mechanism 5 by using the feeding mechanism 4, the motor 42 is started to make the rotating rod 43 drive the auger blade 44 to rotate, so as to transport the soil at the bottom of the heating box 11 from the cylinder 41 and the feeding pipe 45 to the third-level heating mechanism 5.

[0034] Reference Figure 1-Figure 5The three-stage heating mechanism 5 includes a heating box 3 51, an end of the feeding pipe 45 away from the cylinder 41 is connected to the upper internal cavity of the heating box 3 51, two conveyor belts 3 52 are installed on the inner side wall of the heating box 3 51, and a plurality of conductive electrodes 53 are installed on the inner side wall of the heating box 3 51 close to the upper surface of the conveyor belt 3 52, and the conductive electrodes 53 are electrically connected to the external power supply; the bottom internal cavity of the heating box 3 51 is fixedly connected with a discharge pipe 54, and the outer surface of the discharge pipe 54 is installed with a discharge valve 55; specifically, entering the heating box 3 51 The soil inside will fall onto the upper surface of the conveyor belt 3 52 for transmission. At this time, the high-frequency current is precisely controlled to be transmitted between the conductive electrodes 53 using the power control system. In this process, the high-frequency current will generate electromagnetic waves. When these electromagnetic waves propagate in the soil, they will interact with the soil particles and the pollutants therein. When the electromagnetic waves propagate in the soil, they will be converted into thermal energy, causing the soil temperature to rise rapidly, heating the soil particles and the pollutants therein, thereby achieving thermal desorption. The above structures are used to perform multi-stage thermal desorption of the soil to improve the thermal desorption effect.

[0035] Reference Figure 1-Figure 5 The gas guide mechanism 6 includes an exhaust pipe 61, the upper internal volume cavity of the heating box three 51 is connected with a manifold three 64, and the end of the manifold three 64 away from the heating box three 51 is connected to the exhaust pipe 61, the upper internal volume cavity of the heating box one 11 is connected with a manifold one 62, and the end of the manifold one 62 away from the heating box one 11 is connected to the exhaust pipe 61, the upper internal volume cavity of the heating box two 21 is connected with a manifold two 63, and the end of the manifold two 63 away from the heating box two 21 is connected to the exhaust pipe 61, and an exhaust valve 65 is installed on the outer surface of the left end of the exhaust pipe 61; specifically, the gas generated during thermal desorption can be concentrated from the manifold two 63, the manifold one 62 and the manifold three 64 to the exhaust pipe 61, and the exhaust valve 65 can be opened to discharge it into the treatment pool.

[0036] Reference Figure 1-Figure 5 A temperature sensor 24 is installed in the middle of the top inner wall of the heating box 11 and the heating box 21, and the controller 7 is installed on the upper surface of the heating box 11, and the output end of the temperature sensor 24 is electrically connected to the heating box 21, and the output end of the controller 7 is electrically connected to the solenoid valve 18, the microwave generator 23 and the motor 1 31; specifically, the controller 7 uses a single-chip microcomputer as the main control chip, and its model is STC89C51. The two temperature sensors 24 can monitor the temperature of the heating box 21 and the heating box 11 during heating, and feed back to the controller 7 so as to respond to the control of the microwave generator 23, the motor 1 31 and the solenoid valve 18.

[0037] The implementation principle of a multi-stage heating mobile thermal desorption soil remediation device of the present application is:

[0038] When using the device, first connect to an external power source, then open the feed valve 27, and place the soil to be thermally desorbed from the bell mouth 26 and the feed pipe 25 into the interior of the heating box 21. The soil will fall onto the upper surface of the conveyor belt 22 and be transported to the interior of the heating box 11. At this time, start the microwave generator 23 to perform microwave heating on the soil containing pollutants, causing the water molecules in the soil to vibrate, generate heat energy, and then increase the soil temperature. As the temperature rises, the organic pollutants and certain heavy metals in the soil will volatilize due to the heat and separate from the soil; then, heat is applied again through the first-stage heating mechanism 1 and the third-stage heating mechanism 5 to thermally desorb the soil again; through the cooperation of the above structures, the soil is thermally desorbed in multiple stages to improve the thermal desorption effect.

[0039] After the initial thermal desorption by the secondary heating mechanism 2, the soil will be moved and transported to the inside of the heating box 11. The soil entering the heating box 11 will fall onto the upper surface of the conveyor belt 12. The uppermost conveyor belt 12 will slowly be transported to the lowermost conveyor belt 12. At this time, the steam transport pipeline is connected to the air inlet pipe 17, and the solenoid valve 18 is opened. The transported hot steam will pass through the steam pipe 13, the hollow pipe 14 and the hollow circular plate 15 and then disperse from the through hole 16 and slowly move upward to heat the soil transported by the conveyor belt 12. At the same time, the motor 31 is started to make the rotating rod 32 drive the stirring blade 33 to rotate so as to stir the soil transported by the conveyor belt 12, so as to make the heating more uniform and improve the thermal desorption effect. Then, the feeding mechanism 4 is used to transport the soil to the tertiary heating mechanism 5 for thermal desorption again. The soil is subjected to multi-stage thermal desorption through the cooperation of the above structures to improve the thermal desorption effect.

[0040] When the soil is transported to the interior of the heating box 3 51 by using the feeding mechanism 4, the motor 2 42 is started to make the rotating rod 2 43 drive the auger blade 44 to rotate, so as to transport the soil at the bottom of the heating box 11 from the cylinder 41 and the feeding pipe 45 to the interior of the heating box 3 51. The soil entering the interior of the heating box 3 51 will fall to the upper surface of the conveyor belt 3 52 for transmission. At this time, using the power control system, the high-frequency current is precisely controlled to be transmitted between the conductive electrodes 53. In this process, the high-frequency current will generate electromagnetic waves. When these electromagnetic waves propagate in the soil, they will interact with the soil particles and the pollutants therein. When the electromagnetic waves propagate in the soil, they will be converted into heat energy, which will rapidly increase the soil temperature, heat the soil particles and the pollutants therein, and then realize thermal desorption. The soil is subjected to multi-stage thermal desorption through the cooperation of the above structures to improve the thermal desorption effect.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mobile thermal desorption soil remediation device with multi-stage heating, comprising a primary heating mechanism (1), a secondary heating mechanism (2), a stirring mechanism (3), a feeding mechanism (4), a tertiary heating mechanism (5), an air guide mechanism (6) and a controller (7), characterized in that: The secondary heating mechanism (2) is arranged on the upper surface of the left end of the primary heating mechanism (1); the tertiary heating mechanism (5) is connected to the primary heating mechanism (1) through the feeding mechanism (4); the primary heating mechanism (1) comprises a heating box (11); the inner wall of the heating box (11) is provided with three conveyor belts (12) from top to bottom; the inner bottom surface of the heating box (11) is provided with a plurality of hollow tubes (14); the upper surface of the hollow tube (14) is fixedly connected with a hollow circular plate (15); the outer side surface of the hollow circular plate (15) is provided with a plurality of through holes (16); a steam pipe (13) is provided inside the bottom end of the heating box (11); the internal volume of the steam pipe (13) is connected with the hollow tube (14); The number of the stirring mechanisms (3) is several, and the stirring mechanisms (3) include a motor (31), the motor (31) is fixedly connected to the front side of the heating box (11) close to the conveyor belt (12), the output end of the motor (31) is fixedly connected to a rotating rod (32), and the end of the rotating rod (32) away from the motor (31) is rotatably connected to the inner wall of one side of the heating box (11) through a bearing; The secondary heating mechanism (2) comprises a second heating box (21), the second heating box (21) is fixedly connected to the upper surface of the first heating box (11), and the internal volume of the second heating box (21) is connected to the upper internal volume of the first heating box (11), a feed pipe (25) is installed on the upper surface of the left end of the second heating box (21), the upper surface of the feed pipe (25) is fixedly connected to a bell mouth (26), the outer surface of the feed pipe (25) is installed with a feed valve (27), the inner bottom surface of the second heating box (21) is installed with a second conveyor belt (22), and the top inner wall of the second heating box (21) is installed with a plurality of microwave generators (23).

2. The multi-stage heating mobile thermal desorption soil remediation device according to claim 1 is characterized in that: The feeding mechanism (4) comprises a cylinder (41), the cylinder (41) is fixedly connected to the right side of the heating box (11), the internal volume at the bottom end of the cylinder (41) is connected to the internal volume at the bottom end of the heating box (11), the top inner wall of the cylinder (41) is fixedly connected to the motor (42), the output end of the motor (42) is fixedly connected to the rotating rod (43), the outer surface of the rotating rod (43) is fixedly connected to the auger blade (44), and the upper internal volume of the cylinder (41) is connected to the feeding pipe (45).

3. The multi-stage heating mobile thermal desorption soil remediation device according to claim 2 is characterized in that: The three-stage heating mechanism (5) includes a heating box three (51), the end of the feed pipe (45) away from the cylinder (41) is connected to the upper internal cavity of the heating box three (51), two conveyor belts three (52) are installed on the inner side wall of the heating box three (51), and a plurality of conductive electrodes (53) are installed on the inner side wall of the heating box three (51) close to the upper surface of the conveyor belt three (52), and the conductive electrodes (53) are electrically connected to an external power supply.

4. The multi-stage heating mobile thermal desorption soil remediation device according to claim 2 is characterized in that: The inner cavity at the bottom end of the heating box three (51) is fixedly connected to a discharge pipe (54), and a discharge valve (55) is installed on the outer surface of the discharge pipe (54).

5. The multi-stage heating mobile thermal desorption soil remediation device according to claim 2 is characterized in that: The air guide mechanism (6) comprises an exhaust pipe (61); the upper internal volume cavity of the heating box three (51) is connected to a manifold three (64); the end of the manifold three (64) away from the heating box three (51) is connected to the exhaust pipe (61); the upper internal volume cavity of the heating box one (11) is connected to a manifold one (62); the end of the manifold one (62) away from the heating box one (11) is connected to the exhaust pipe (61); the upper internal volume cavity of the heating box two (21) is connected to a manifold two (63); the end of the manifold two (63) away from the heating box two (21) is connected to the exhaust pipe (61); an exhaust valve (65) is installed on the outer surface of the left end of the exhaust pipe (61).

6. The multi-stage heating mobile thermal desorption soil remediation device according to claim 1 is characterized in that: The inner cavity at the left end of the steam pipe (13) is fixedly connected to an air intake pipe (17), and an electromagnetic valve (18) is installed on the outer surface of the air intake pipe (17).

7. The multi-stage heating mobile thermal desorption soil remediation device according to claim 6 is characterized in that: A temperature sensor (24) is installed in the middle of the top inner wall of the heating box one (11) and the heating box two (21), the controller (7) is installed on the upper surface of the heating box one (11), and the output end of the temperature sensor (24) is electrically connected to the heating box two (21), and the output end of the controller (7) is electrically connected to the solenoid valve (18), the microwave generator (23) and the motor one (31).

8. The multi-stage heating mobile thermal desorption soil remediation device according to claim 2 is characterized in that: The heating box 1 (11) is fixedly connected with a material guiding inclined block (19) near the inner bottom surface of the cylinder (41), and the upper surface of the material guiding inclined block (19) is inclined from all sides toward the lower end opening of the cylinder (41).

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