Thermal desorption device for local remediation of soil

Abstract

The utility model belongs to the technical field of soil remediation, and particularly relates to a thermal desorption device for local soil remediation. The thermal desorption device comprises a movable box body, a thermal desorption chamber is arranged in the box body, a bidirectional conveying mechanism which is loaded with soil and moves is installed in the thermal desorption chamber, the bidirectional conveying mechanism comprises a conveying belt which is driven by conveying rollers to move in the circumferential direction, and a plurality of supports are installed on the conveying belt in the moving direction of the conveying belt. Each support is provided with an open transfer box. A soil sampling mechanism is arranged at the feeding and discharging end of the thermal desorption chamber. According to the utility model, the steam heating chamber, the thermal desorption chamber, the condensation chamber and the tail gas emission chamber are integrally designed, so that the overall structure is reduced; and the movable box body and the bidirectional conveying mechanism which is used for loading soil and does reciprocating motion are arranged, so that automatic soil taking and soil unloading can be realized, and additional manual transfer is not needed.

Description

Technical Field

[0001] This utility model belongs to the field of soil remediation technology, and in particular relates to a thermal desorption device for local soil remediation. Background Technology

[0002] With the acceleration of industrialization and rapid urbanization, soil pollution has become an increasingly serious problem and a global concern. Soil pollution not only affects the sustainable use of land resources but also poses a serious threat to the ecological environment and human health. Therefore, soil remediation technology has become crucial for solving this problem. Thermal desorption technology is an important soil pollution remediation technology. It refers to the process of heating organic pollutants in the soil to a sufficient temperature through direct or indirect heat exchange under vacuum conditions or with a carrier gas, allowing the organic pollutants to volatilize or separate from the polluted medium and enter the gas treatment system. Thermal desorption is a physical separation process that transforms pollutants from one phase to another, and it does not damage the organic pollutants during the remediation process.

[0003] Thermal desorption equipment typically includes a heating device for heat exchange, a condensation device, and an exhaust gas treatment device to achieve thermal desorption of soil. However, traditional thermal desorption equipment usually transports soil from one end to the other via a conveyor belt after soil collection and heating. This process is unidirectional and cannot guarantee that the soil is fully thermally desorbed. Especially in local soil remediation, the thermally desorbed soil needs to be refilled into the soil collection pit. Unidirectional transportation requires additional transfer of soil for repositioning, increasing the number of operational steps. Furthermore, traditional thermal desorption equipment is bulky and cannot be used flexibly in local soil remediation. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this invention provides a thermal desorption device for local soil remediation. This invention features an integrated design, offering advantages such as flexible use, bidirectional soil transport, and convenient soil backfilling while ensuring sufficient thermal desorption of the soil.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A thermal desorption device for local soil remediation includes a movable box, which is provided from bottom to top with a steam heating chamber for heating the soil, a thermal desorption chamber for thermal desorption treatment of the soil, and a condensation chamber for rapidly condensing the generated exhaust gas. The condensation chamber is connected to the exhaust gas emission chamber.

[0007] The thermal desorption chamber is equipped with a bidirectional conveying mechanism for loading and moving soil. The bidirectional conveying mechanism includes a conveyor belt that is driven to move circumferentially by conveyor rollers. Several supports are installed on the conveyor belt along its direction of movement, and each support is equipped with an open transfer box. The inlet and outlet ends of the thermal desorption chamber are equipped with soil sampling mechanisms.

[0008] Preferably, the two sides of the transfer box are movably connected to the bracket via a rotating shaft, and the center of gravity of the transfer box is located at the center of its bottom.

[0009] Preferably, the rotating shafts are located on both sides of the top of the transfer box, and counterweights are installed at the bottom of the transfer box.

[0010] Preferably, the soil sampling mechanism includes a soil sampling component and a moving component that drives the soil sampling component to move. The soil sampling component includes a drill bit, a soil storage cavity, and a drive motor that drives the drill bit to rotate. The drill bit is placed at the bottom of the soil storage cavity, and a soil inlet is provided at the bottom of the drill bit.

[0011] Preferably, the moving component includes a vertically arranged reciprocating screw and a horizontally arranged telescopic arm. The telescopic end of the telescopic arm is provided with a fixing member, and a threaded groove is opened through the middle of the fixing member. The rod body of the reciprocating screw passes through the threaded groove. The driving end of the drive motor is connected to the top of the reciprocating screw, and the bottom of the reciprocating screw is fixedly connected to the top of the soil storage cavity. A vertical pole is provided on the telescopic arm, and the drive motor is mounted on the vertical pole in a height-adjustable manner through an annular movable seat.

[0012] Preferably, the top of the inlet and outlet of the thermal desorption chamber is provided with an automatically opening and closing inlet, the bottom of the inlet and outlet of the thermal desorption chamber is provided with an automatically opening and closing outlet, and the bidirectional conveying mechanism is provided with a baffle bar on the side near the outlet, so that the transfer box flips when it passes the baffle bar.

[0013] Preferably, the drill bit is hinged to one side of the soil storage cavity via a hinge, and the other side of the drill bit is detachably connected to the soil storage cavity via a fixing pin.

[0014] Preferably, the transport box has several ventilation holes all around its body.

[0015] The advantages of this utility model are:

[0016] (1) The present invention integrates a steam heating chamber, a thermal desorption chamber, a condensation chamber and a tail gas emission chamber, which reduces the overall structure; the movable box and the bidirectional conveying mechanism for loading and reciprocating soil can realize automatic soil picking and unloading without the need for manual additional transportation.

[0017] (2) The soil sampling mechanism of this utility model uses a reciprocating screw as the propulsion mechanism of the drill bit. In the process of the reciprocating screw moving down to the lowest point and then moving up to the highest point, the drill bit first penetrates into the ground and then leaves to complete the soil sampling operation. It can realize quantitative soil sampling, and the structure is simple and easy to operate.

[0018] (3) By setting a bidirectional conveying mechanism in the thermal desorption chamber, the present invention can send soil into the thermal desorption chamber and then send it out. During this process, the soil is heated so that pollutants are evaporated and removed. The bidirectional reciprocating conveying method can increase the heating time of the soil and facilitate the soil to return to the starting point for backfilling.

[0019] (4) The bidirectional conveying mechanism of this device uses a transfer box that can rotate on the support to receive soil. The support is installed on the conveyor belt. As the conveyor belt moves, it drives the transfer box to move. Since the transfer box can rotate on the support and its center of gravity is always close to the bottom, the opening of the transfer box is always facing upward when the support moves cyclically on the conveyor belt, which can prevent soil from spilling and increase the stability of the conveying. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the thermal desorption device of this utility model.

[0021] Figure 2 This is a schematic diagram of the bidirectional conveying mechanism of this utility model.

[0022] Figure 3 This is a schematic diagram of the soil extraction mechanism of this utility model.

[0023] The meanings of the symbols marked in the figure are as follows:

[0024] 1-Steam heating chamber, 2-Thermal desorption chamber, 21-Inlet, 22-Outlet, 3-Condensation chamber, 4-Tail gas emission chamber, 5-Bidirectional conveying mechanism, 51-Conveyor belt, 52-Conveyor roller, 53-Support, 54-Transfer box, 55-Stop bar, 56-Rotating shaft, 6-Soil sampling mechanism, 61-Soil sampling assembly, 611-Drill bit, 612-Drive motor, 613-Soil storage cavity, 614-Soil inlet trough, 615-Hinge, 616-Fixing pin, 62-Moving assembly, 621-Reciprocating screw, 622-Telescopic arm, 623-Upright pole, 624-Moving seat, 625-Fixing component. Detailed Implementation

[0025] like Figure 1-3 As shown, a thermal desorption device for local soil remediation operates on the following principle: The device includes a steam heating chamber 1, which generates high-temperature steam to heat the soil for thermal desorption; a thermal desorption chamber 2, in which the soil is heated and the internal pollutants are evaporated; a condensation chamber 3, which cools the exhaust gas; and an exhaust gas emission chamber 4, in which the exhaust gas is treated before being released into the atmosphere. Steam generation, exhaust gas condensation, and exhaust gas treatment are all existing technologies and will not be described in detail.

[0026] Figure 1In the process, a bidirectional conveying mechanism 5 is installed inside the thermal desorption chamber 2, and a soil sampling mechanism 6 is installed at the front end of the thermal desorption chamber 2. Soil is taken from a local area of ​​the ground through the soil sampling mechanism 6 and placed into the thermal desorption chamber 2 through the bidirectional conveying mechanism 5 for thermal desorption operation. The principle of the bidirectional conveying mechanism 5 is as follows: Figure 2 As shown, the system includes a motor-driven conveyor roller 52 that rotates. A circular conveyor belt 51 is fitted over the outer side of the conveyor rollers 52, causing the conveyor rollers 52 to rotate and thus rotating the conveyor belt 51. Multiple supports 53 are mounted on the conveyor belt 51 along its circumference. Each support 53 has a transfer box 54. The transfer box 54 has an opening at the top and ventilation holes on its body and bottom to allow steam to enter from the bottom and contact the soil. The transfer box 54 is connected to the support 53 by a rotating shaft 56. The rotating shaft 56 is close to the top of the transfer box 54, lowering its center of gravity. Even if the support 53 tilts, the transfer box 54 will always maintain its opening facing upwards. Alternatively, a counterweight can be added to the bottom of the transfer box 54 to increase its stability. The conveyor belt 51 continuously transports soil, and the supports 53, carrying the transfer box 54, move from one end of the conveyor belt 51 to the other end and then back to the initial point from below the conveyor belt 51. This process allows the soil to complete a full circle and return to the starting point, making backfilling more convenient.

[0027] Specifically, the top of the inlet and outlet of the thermal desorption chamber 2 is provided with an automatically opening and closing inlet 21, and the bottom of the inlet and outlet of the thermal desorption chamber 2 is provided with an automatically opening and closing outlet 22. A rotatable baffle 55 is installed at the initial position of the bidirectional conveying mechanism 5 (on the side near the outlet 22). When the transfer box 54 passes the baffle 55, it is blocked and flipped, dumping the soil in the box out without additional power, thus realizing automatic soil feeding. Alternatively, when the soil needs to be heated for a longer period, the baffle 55 can be lowered to facilitate the passage of the transfer box 54 and increase the heating time of the soil in the thermal desorption chamber 2.

[0028] like Figure 3 As shown, the soil extraction mechanism 6 uses a drive motor 612 to drive a drill bit 611 deep into the ground. A soil inlet 614 is opened at the bottom of the drill bit 611, allowing it to rotate and advance downwards. Soil flows through the inlet 614 into the soil storage chamber 613 for storage. The drill bit 611 is hinged to one side of the soil storage chamber 613 via a hinge 615, and fixed to the other side of the chamber 613 via a fixing pin 616. Removing the fixing pin 616 allows the drill bit 611 to be opened, allowing the soil to fall into the transfer box 54. During soil extraction, the feed inlet 21 and discharge outlet 22 can also be opened simultaneously, allowing the drill bit 611 to directly penetrate both inlet 21 and discharge outlet 22 sequentially for soil extraction.

[0029] Furthermore, the rotational propulsion of the drill bit 611 is accomplished by a reciprocating screw 621. A drive motor 612 is mounted on the top of the reciprocating screw 621. A fixing member 625 is provided at the telescopic end of the telescopic arm 622. A threaded groove is formed through the middle of the fixing member 625, and the shaft of the reciprocating screw 621 passes through the threaded groove. A vertical rod 623 is provided at the top of the telescopic arm 622. An annular movable seat 624 is fitted on the outside of the vertical rod 623. The drive motor 612 can be raised and lowered on the vertical rod 623 via the annular movable seat 624. As the drive motor 612 operates, the reciprocating screw 621 rotates, and due to the threaded groove... The reciprocating screw 621 can move downwards when rotating until it reaches the bottom, and then move upwards to the top. In this process, the drill bit 611 first rotates downwards to advance to the lowest point, and then rotates upwards back to the highest point to complete one soil extraction operation. The vertically movable motor base makes the drive motor 612 more stable when it moves up and down. The telescopic arm 622 can control the drill bit 611 to move laterally to the feed inlet 21 or leave the feed inlet 21. The soil loading position of the transfer box 54 is located directly below the feed inlet 21, and the soil unloading position of the transfer box 54 is located directly above the discharge port 22.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thermal desorption device for local soil remediation, characterized in that, It includes a movable box, which is provided from bottom to top with a steam heating chamber (1) for heating the soil, a thermal desorption chamber (2) for thermal desorption treatment of the soil, and a condensation chamber (3) for rapid condensation treatment of the generated exhaust gas. The condensation chamber (3) is connected to the exhaust gas emission chamber (4). The thermal desorption chamber (2) is equipped with a bidirectional conveying mechanism (5) for loading and moving soil. The bidirectional conveying mechanism (5) includes a conveyor belt (51) driven by a conveyor roller (52) to move circumferentially. Several supports (53) are installed on the conveyor belt (51) along its direction of movement. Each support (53) is provided with an open transfer box (54). The inlet and outlet ends of the thermal desorption chamber (2) are provided with a soil sampling mechanism (6).

2. The thermal desorption device for local soil remediation according to claim 1, characterized in that: The two sides of the transfer box (54) are movably connected to the bracket (53) via a rotating shaft (56), and the center of gravity of the transfer box (54) is located at the center of its bottom.

3. The thermal desorption device for local soil remediation according to claim 2, characterized in that: The rotating shaft (56) is located on both sides of the top of the transfer box (54), and a counterweight is installed at the bottom of the transfer box (54).

4. The thermal desorption device for local soil remediation according to claim 1, characterized in that: The soil sampling mechanism (6) includes a soil sampling component (61) and a moving component (62) for moving the soil sampling component (61). The soil sampling component (61) includes a drill bit (611), a soil storage cavity (613), and a drive motor (612) for driving the drill bit (611) to rotate. The drill bit (611) is placed at the bottom of the soil storage cavity (613), and a soil inlet slot (614) is provided at the bottom of the drill bit (611).

5. The thermal desorption device for local soil remediation according to claim 4, characterized in that: The moving component (62) includes a vertically arranged reciprocating lead screw (621) and a horizontally arranged telescopic arm (622). The telescopic end of the telescopic arm (622) is provided with a fixing member (625). A threaded groove is opened through the middle of the fixing member (625). The rod body of the reciprocating lead screw (621) passes through the threaded groove. The driving end of the drive motor (612) is connected to the top of the reciprocating lead screw (621). The bottom of the reciprocating lead screw (621) is fixedly connected to the top of the soil storage cavity (613). A vertical pole (623) is provided on the telescopic arm (622). The drive motor (612) is mounted on the vertical pole (623) in a height-reducible manner through an annular movable seat (624).

6. The thermal desorption device for local soil remediation according to claim 1, characterized in that: The top of the inlet and outlet of the thermal desorption chamber (2) is provided with an automatically opening and closing inlet (21), and the bottom of the inlet and outlet of the thermal desorption chamber (2) is provided with an automatically opening and closing outlet (22). The bidirectional conveying mechanism (5) is provided with a baffle (55) on the side near the outlet (22), so that the transfer box (54) flips when it passes the baffle (55).

7. The thermal desorption device for local soil remediation according to claim 4, characterized in that: The drill bit (611) is hinged to one side of the soil storage cavity (613) via a hinge (615), and the other side of the drill bit (611) is detachably connected to the soil storage cavity (613) via a fixing pin (616).

8. The thermal desorption device for local soil remediation according to claim 1, characterized in that: The transfer box (54) has several ventilation holes all around its body.

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