A thermal desorption device for soil pollution remediation

Abstract

The utility model discloses a kind of thermal desorption devices of soil pollution remediation, belong to the technical field of soil pollution remediation, including box, the bottom of the box inner chamber is provided with arc groove, the side of box bottom end is provided with soil pipe, the bottom of the arc groove inner chamber is provided with arc heating plate, the side of box is fixedly installed with second motor.In the utility model, by setting suction box above arc groove, while setting multiple suction holes below suction box, ensure the effect of extracting harmful gas, produce suction force in the process of thermal desorption by suction pump to make suction pipe, suction box and suction hole, use the suction force of suction hole to suck the hot steam generated by soil heating into the inner chamber of second gas guide groove, use the hot steam flowing in second gas guide groove to preheat the contaminated soil in arc tube inner chamber, ensure the efficiency of heat exchange for contaminated soil, good practicability.

Description

Technical Field

[0001] This utility model relates to the field of soil pollution remediation technology, and more specifically, to a thermal desorption device for soil pollution remediation. Background Technology

[0002] Thermal desorption is a physical remediation technology that uses direct or indirect heating to evaporate and separate pollutants from contaminated soil. This technology is suitable for the remediation of soils contaminated with petroleum hydrocarbons, volatile organic compounds, semi-volatile organic compounds, and heavy metals such as mercury. The core principle is to decompose or convert pollutants into gaseous phase desorption through heating, rather than direct incineration.

[0003] A search revealed a utility model patent with publication number CN219683567U, which discloses an energy-saving thermal desorption device for soil pollution remediation. The device includes a housing with a conveyor belt inside. A partition is fixedly connected to one inner wall of the housing, and heating plates are fixedly connected to the bottom of the partition and the bottom inner wall of the housing. A drive motor is fixedly connected to one side of the housing, and an auger is fixedly connected to the output shaft of the drive motor. A feed hopper is fixedly connected to the top of the housing. This patent can collect the heat generated during thermal desorption and preheat the soil, improving the efficiency of thermal desorption, saving costs, and increasing the utilization rate of heat during desorption, effectively saving energy. It can also absorb and purify the emitted harmful gases without causing environmental pollution. However, the above patent has the following shortcomings: the bottom of the suction tube can only suck air from one side of the bottom of the housing, affecting the discharge and purification of harmful gases. Furthermore, the preheating effect of the hot air in the heat exchange coil on soil particles is unsatisfactory. Therefore, we propose a thermal desorption device for soil pollution remediation. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide a thermal desorption device for soil pollution remediation.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A thermal desorption device for soil pollution remediation includes a housing. An arc-shaped groove is provided at the bottom of the inner cavity of the housing. A soil discharge pipe is provided on the side of the bottom end of the housing. An arc-shaped heating plate is provided at the bottom of the inner cavity of the arc-shaped groove. A second motor is fixedly installed on the side of the housing. The output shaft of the second motor extends into the inner cavity of the arc-shaped groove and is fixedly connected to a second spiral conveying rod via a coupling. An arc-shaped tube is fixedly sleeved within the inner cavity of the housing. A first motor is fixedly installed on the side of the housing, and the output shaft of the first motor extends into the arc-shaped tube. The inner cavity is fixedly connected to a first spiral conveying rod via a coupling. The inside of the arc-shaped tube is provided with a second air guide groove. An air suction pipe is fixedly sleeved at the bottom of the arc-shaped tube. The top end of the air suction pipe is connected to the inner cavity of the second air guide groove. An air suction box is fixedly sleeved at the bottom end of the air suction pipe. The bottom surface of the air suction box is provided with multiple air suction holes. An air pump is fixedly installed on the side of the box. The input end of the air pump extends into the inner cavity of the second air guide groove. A material injection mechanism is provided at the top of the box. A purification mechanism is provided at the top of the box.

[0007] As a preferred embodiment of this utility model, the feeding mechanism includes a feeding hopper fixedly sleeved on the top of the box body. The inside of the feeding hopper is provided with a first air guide groove. An air guide pipe is fixedly sleeved on the side of the feeding hopper. One end of the air guide pipe extends into the inner cavity of the first air guide groove, and the other end of the air guide pipe is connected to the output end of the air pump. A crushing rod is rotatably connected to the inner cavity of the feeding hopper. Multiple crushing blades are fixedly connected to the side of the crushing rod. A third motor is fixedly installed on the outside of the feeding hopper. The output shaft of the third motor is connected to the end of the crushing rod through a coupling.

[0008] As a preferred embodiment of this utility model, the purification mechanism includes a purification box fixedly connected to the top surface of the box body, a sealing plate hinged to the front of the purification box, an exhaust pipe fixedly sleeved at one end of the purification box, the end of the exhaust pipe fixedly sleeved to the inner cavity of the first air guide groove, multiple exhaust holes opened at the other end of the purification box, and activated carbon cotton sleeved in the inner cavity of the purification box.

[0009] As a preferred embodiment of this utility model, a filter screen is fixedly connected to the bottom surface of the air intake box.

[0010] In a preferred embodiment of this utility model, the outer side of the second spiral conveyor rod is in contact with the inner side of the arc-shaped groove, the arc-shaped heating plate, and the soil discharge pipe, respectively, and the outer side of the first spiral conveyor rod is in contact with the inner wall of the arc-shaped pipe.

[0011] In a preferred embodiment of this utility model, the outer surface of the activated carbon cotton is fitted to the inner wall of the purification box.

[0012] Compared with existing technologies, the advantages of this utility model are:

[0013] (1) In this utility model, by setting an air suction box above the arc-shaped groove and setting multiple air suction holes below the air suction box, the effect of extracting harmful gases is ensured. During the thermal desorption process, the air suction pump generates suction force through the air suction pipe, air suction box and air suction holes. The suction force of the air suction holes is used to draw the hot steam generated by heating the soil into the inner cavity of the second air guide groove. The hot steam flowing in the second air guide groove is used to preheat the contaminated soil in the inner cavity of the arc-shaped pipe, ensuring the efficiency of heat exchange for the contaminated soil. It has good practicality.

[0014] (2) In this utility model, the gas after heat exchange in the second air guide groove is introduced into the first air guide groove inside the feed hopper through the exhaust pipe. The gas flowing in the inner cavity of the first air guide groove is used to preheat the contaminated soil placed into the inner cavity of the box in the feed hopper. At the same time, the preheating of the contaminated soil on the arc-shaped pipe is also used to ensure that the heat of the gas is fully utilized and the preheating effect of the soil is guaranteed. It has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the present invention;

[0017] Figure 3 This is a schematic diagram of the arc-shaped tube of this utility model;

[0018] Figure 4 This is a cross-sectional schematic diagram of the arc-shaped tube of this utility model;

[0019] Figure 5 This is a cross-sectional schematic diagram of the feed hopper of this utility model;

[0020] Figure 6 This is a cross-sectional schematic diagram of the purification box of this utility model.

[0021] Explanation of the labels in the diagram:

[0022] 1. Box body; 2. Arc-shaped groove; 3. Arc-shaped heating plate; 4. Soil discharge pipe; 5. Second motor; 6. Second spiral conveyor rod; 7. Arc-shaped pipe; 8. First motor; 9. Second air guide groove; 10. Suction pipe; 11. Suction box; 12. Suction hole; 13. Air pump; 14. Material injection mechanism; 15. Purification mechanism; 16. Feed hopper; 17. First air guide groove; 18. Air guide pipe; 19. Crushing rod; 20. Crushing blade; 21. Third motor; 22. Purification box; 23. Sealing plate; 24. Activated carbon cotton; 25. Exhaust hole; 26. Filter screen; 27. First spiral conveyor rod; 28. Exhaust pipe. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example:

[0027] Please see Figure 1-6 A thermal desorption device for soil pollution remediation includes a housing 1. An arc-shaped groove 2 is provided at the bottom of the inner cavity of the housing 1. A soil discharge pipe 4 is provided on the side of the bottom end of the housing 1. An arc-shaped heating plate 3 is provided at the bottom of the inner cavity of the arc-shaped groove 2. A second motor 5 is fixedly installed on the side of the housing 1. The output shaft of the second motor 5 extends into the inner cavity of the arc-shaped groove 2 and is fixedly connected to a second spiral conveying rod 6 via a coupling. An arc-shaped tube 7 is fixedly sleeved within the inner cavity of the housing 1. A first motor 8 is fixedly installed on the side of the housing 1. The output shaft of the first motor 8 extends into the inner cavity of the arc-shaped tube 7 and is fixedly connected to a second spiral conveying rod 6 via a coupling. A first spiral feed rod 27 is fixedly connected to the coupling. A second air guide groove 9 is provided inside the arc-shaped tube 7. An air suction pipe 10 is fixedly sleeved at the bottom of the arc-shaped tube 7. The top end of the air suction pipe 10 is connected to the inner cavity of the second air guide groove 9. An air suction box 11 is fixedly sleeved at the bottom end of the air suction pipe 10. Multiple air suction holes 12 are provided on the bottom surface of the air suction box 11. An air pump 13 is fixedly installed on the side of the box body 1. The input end of the air pump 13 extends to the inner cavity of the second air guide groove 9. A material injection mechanism 14 is provided on the top of the box body 1. A purification mechanism 15 is provided on the top of the box body 1.

[0028] In this embodiment, the device is controlled by a controller on the front of the housing 1 and powered by an external power supply. This is existing technology and will not be described in detail.

[0029] For details, please refer to Figure 1 , Figure 2 and Figure 5 The feeding mechanism 14 includes a feeding hopper 16 fixedly sleeved on the top of the housing 1. The inside of the feeding hopper 16 is provided with a first air guide groove 17. An air guide pipe 18 is fixedly sleeved on the side of the feeding hopper 16. One end of the air guide pipe 18 extends into the inner cavity of the first air guide groove 17. The other end of the air guide pipe 18 is connected to the output end of the air pump 13. A crushing rod 19 is rotatably connected to the inner cavity of the feeding hopper 16. Multiple crushing blades 20 are fixedly connected to the side of the crushing rod 19. A third motor 21 is fixedly installed on the outside of the feeding hopper 16. The output shaft of the third motor 21 is connected to the end of the crushing rod 19 through a coupling.

[0030] In this embodiment, the third motor 21 drives the crushing rod 19 and the crushing blade 20 to rotate, thereby crushing the soil placed into the inner cavity of the feed hopper 16. In addition, the arc-shaped tube 7 and the feed hopper 16 are both made of heat-conducting materials so that the soil can be preheated.

[0031] For details, please refer to Figure 1 , Figure 2 and Figure 6 The purification mechanism 15 includes a purification box 22 fixedly connected to the top surface of the box body 1. A sealing plate 23 is hinged to the front of the purification box 22. An exhaust pipe 28 is fixedly sleeved at one end of the purification box 22. The end of the exhaust pipe 28 is fixedly sleeved to the inner cavity of the first air guide groove 17. Multiple exhaust holes 25 are opened at the other end of the purification box 22. Activated carbon cotton 24 is sleeved in the inner cavity of the purification box 22.

[0032] In this embodiment, the activated carbon cotton 24 inside the purification box 22 is replaced by opening the sealing plate 23.

[0033] For details, please refer to Figure 3 A filter screen 26 is fixedly connected to the bottom surface of the air intake box 11.

[0034] In this embodiment, the filter screen 26 prevents soil from being sucked into the inner cavity of the air intake box 11.

[0035] For details, please refer to Figure 2 The outer side of the second spiral conveyor rod 6 is in contact with the inner side of the arc groove 2, the arc heating plate 3, and the soil discharge pipe 4, respectively, and the outer side of the first spiral conveyor rod 27 is in contact with the inner wall of the arc pipe 7.

[0036] In this embodiment, the second spiral conveying rod 6 is guaranteed to be able to push the contaminated soil to move within the inner cavity of the arc-shaped trough 2, while the first spiral conveying rod 27 is guaranteed to be able to push the contaminated soil to move within the inner cavity of the arc-shaped pipe 7.

[0037] For details, please refer to Figure 6 The outer surface of the activated carbon cotton 24 is attached to the inner wall of the purification box 22.

[0038] In this embodiment, the stability of the activated carbon cotton 24 set inside the purification box 22 is ensured, while ensuring that the activated carbon cotton 24 can completely adsorb and purify the gas passing through the purification box 22.

[0039] Working principle: In operation, the arc-shaped heating plate 3 is first energized to generate heat. Simultaneously, the second motor 5, the first motor 8, and the third motor 21 are started. The third motor 21 drives the crushing rod 19 and the crushing blade 20 to rotate. The second motor 5 drives the second spiral conveyor rod 6 to rotate, and the first motor 8 drives the first spiral conveyor rod 27 to rotate. Then, the contaminated soil to be treated is placed into the inner cavity of the feed hopper 16. The crushing blade 20 crushes the contaminated soil, which falls onto the arc-shaped pipe 7. At this time, the rotating first spiral conveyor rod 27 pushes the soil to move within the arc-shaped pipe 7, causing it to fall from the end of the pipe into the inner cavity of the arc-shaped groove 2. Then, the second spiral conveyor rod 6 pushes the soil to move within the arc-shaped groove 2, and the arc-shaped heating plate 3 heats the soil to evaporate and separate the pollutants. The treated soil is discharged from the discharge pipe 4. When the vacuum pump 13 is activated, it draws air into the inner cavity of the second air guide groove 9. The negative pressure inside the second air guide groove 9 generates suction through the suction pipe 10, suction box 11, and suction hole 12. The suction through the suction hole 12 draws the hot steam generated by heating the soil into the inner cavity of the second air guide groove 9. The hot steam flowing in the second air guide groove 9 preheats the contaminated soil inside the arc-shaped pipe 7. In addition, the hot steam inside the second air guide groove 9 is introduced into the first air guide groove 17 inside the feed hopper 16 through the air guide pipe 18. The hot steam flowing in the first air guide groove 17 preheats the soil inside the feed hopper 16, ensuring the preheating effect of the contaminated soil. Finally, the hot steam inside the first air guide groove 17 is introduced into the inner cavity of the purification box 22 through the exhaust pipe 28. The activated carbon cotton 24 absorbs and purifies the harmful gases in the hot steam entering the inner cavity of the purification box 22. The purified gas is discharged from the exhaust hole 25.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A thermal desorption device for soil pollution remediation, comprising a housing (1), characterized in that: An arc-shaped groove (2) is provided at the bottom of the inner cavity of the box (1). A soil discharge pipe (4) is provided on the side of the bottom end of the box (1). An arc-shaped heating plate (3) is provided at the bottom of the inner cavity of the arc-shaped groove (2). A second motor (5) is fixedly installed on the side of the box (1). The output shaft of the second motor (5) extends into the inner cavity of the arc-shaped groove (2) and is fixedly connected to a second spiral conveyor rod (6) through a coupling. An arc-shaped tube (7) is fixedly sleeved in the inner cavity of the box (1). A first motor (8) is fixedly installed on the side of the box (1). The output shaft of the first motor (8) extends into the inner cavity of the arc-shaped tube (7) and is fixedly connected to a first spiral conveyor rod through a coupling. The rod (27) has a second air guide groove (9) inside the arc-shaped tube (7). The bottom of the arc-shaped tube (7) is fixedly sleeved with an air suction pipe (10). The top of the air suction pipe (10) is connected to the inner cavity of the second air guide groove (9). The bottom end of the air suction pipe (10) is fixedly sleeved with an air suction box (11). The bottom surface of the air suction box (11) is provided with multiple air suction holes (12). The side of the box (1) is fixedly installed with a vacuum pump (13). The input end of the vacuum pump (13) extends to the inner cavity of the second air guide groove (9). The top of the box (1) is provided with a material injection mechanism (14). The top of the box (1) is provided with a purification mechanism (15).

2. The thermal desorption device for soil pollution remediation according to claim 1, characterized in that: The feeding mechanism (14) includes a feeding hopper (16) fixedly sleeved on the top of the box (1). The inside of the feeding hopper (16) is provided with a first air guide groove (17). The side of the feeding hopper (16) is fixedly sleeved with an air guide pipe (18). One end of the air guide pipe (18) extends into the inner cavity of the first air guide groove (17). The other end of the air guide pipe (18) is connected to the output end of the air pump (13). The inner cavity of the feeding hopper (16) is rotatably connected with a crushing rod (19). Multiple crushing blades (20) are fixedly connected to the side of the crushing rod (19). A third motor (21) is fixedly installed on the outside of the feeding hopper (16). The output shaft of the third motor (21) is connected to the end of the crushing rod (19) through a coupling.

3. The thermal desorption device for soil pollution remediation according to claim 2, characterized in that: The purification mechanism (15) includes a purification box (22) fixedly connected to the top surface of the box body (1). A sealing plate (23) is hinged to the front of the purification box (22). An exhaust pipe (28) is fixedly sleeved at one end of the purification box (22). The end of the exhaust pipe (28) is fixedly sleeved to the inner cavity of the first air guide groove (17). Multiple exhaust holes (25) are opened at the other end of the purification box (22). Activated carbon cotton (24) is sleeved in the inner cavity of the purification box (22).

4. The thermal desorption device for soil pollution remediation according to claim 1, characterized in that: A filter screen (26) is fixedly connected to the bottom surface of the air intake box (11).

5. The thermal desorption device for soil pollution remediation according to claim 1, characterized in that: The outer side of the second spiral conveyor rod (6) is in contact with the inner side of the arc groove (2), the arc heating plate (3), and the soil discharge pipe (4), respectively, and the outer side of the first spiral conveyor rod (27) is in contact with the inner wall of the arc pipe (7).

6. The thermal desorption device for soil pollution remediation according to claim 3, characterized in that: The outer surface of the activated carbon cotton (24) is in contact with the inner wall of the purification box (22).

Images