Heat desorption sinking pipe structure for soil remediation

Abstract

The utility model provides a kind of hot desorption sinking pipe structure for soil remediation, it is related to soil remediation technical field, including outer protection pipe and core rod, the upper end of outer protection pipe has a guide sleeve, core rod is longitudinally slidingly connected in guide sleeve, the outer protection pipe includes upper cylinder section, middle conical cylinder section and lower cylinder section, outer protection pipe outer wall has the helical guide vane in middle conical cylinder section and lower cylinder section, the outer diameter of helical guide vane is same with the outer diameter of upper cylinder section, the upper portion of core rod is hollow structure with vent hole, vent hole is communicated with outer protection pipe inner chamber, the lower end of core rod has plug in the lower end of outer protection pipe, the lower end of plug is fixedly connected with a heating rod, the middle conical cylinder section and lower cylinder section have air inlet hole.The utility model has the advantages of high desorption efficiency.

Description

Technical Field

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

[0002] Thermal desorption, as one of the main methods in physical remediation, is particularly effective in treating soils with high concentrations of organic pollution. Its basic principle is to heat the contaminated soil, causing the target pollutants to volatilize or separate from the soil. During thermal desorption, the target pollutants undergo evaporation, distillation, boiling, oxidation, and pyrolysis. By controlling the system temperature and material residence time, different pollutants can be selectively extracted. It is particularly effective for volatile and semi-volatile organic pollutants (such as polycyclic aromatic hydrocarbons, pesticides, petroleum hydrocarbons, and polychlorinated biphenyls) in contaminated soil.

[0003] The existing in-situ thermal desorption method involves first drilling holes and then lowering a tube to protect the holes. The tube has a porous or porous groove structure. While heating the inside of the hole, the decomposition gas inside the hole is extracted. In this method, the pores of the tube are easily blocked, and the heating area and heating efficiency of the soil are also low. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention proposes a thermal desorption submerged tube structure that can effectively increase the size of soil remediation applications.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a thermal desorption submerged tube structure for soil remediation, characterized in that it includes an outer protective tube and a core rod. The upper end of the outer protective tube has a guide sleeve, and the core rod is longitudinally slidably connected inside the guide sleeve. The outer protective tube includes an upper cylindrical section, a middle conical section, and a lower cylindrical section. The outer wall of the outer protective tube has spiral guide plates located in the middle conical section and the lower cylindrical section. The outer diameter of the spiral guide plates is the same as the outer diameter of the upper cylindrical section. The upper part of the core rod is a hollow structure with a vent hole, which communicates with the inner cavity of the outer protective tube. The lower end of the core rod has a plug located at the lower end of the outer protective tube. A heating rod is fixedly connected to the lower end of the plug. The middle conical section and the lower cylindrical section have air inlets.

[0006] Furthermore, the top of the outer protective tube has a limiting disc.

[0007] In this design, the outer protective tube can be used as a tool for expanding the borehole. With a foundation hole, the outer protective tube is lowered into the soil by screwing it in until the limiting plate contacts the soil surface. After that, the outer protective tube continues to rotate, and under the action of the spiral guide vanes, the expanded soil can sink to the bottom of the hole, creating a certain gap between the spiral guide vanes. This increases the heat exchange area and efficiency, and also forms a spiral air channel. The heating rod is located below the outer protective tube and is further inserted into the soil. After heating the soil, the hot air rises. At the same time, the upper end of the vent is connected to a negative pressure air source, creating a negative pressure inside the outer protective tube. Under the action of the negative pressure, the hot air can be drawn away through the air inlet.

[0008] During the expansion process, the air inlet is easily blocked by soil. At this time, the core rod can be moved up and down intermittently to open the lower end of the outer protective tube intermittently, so that the negative pressure inside the outer protective tube fluctuates. The air vent can be cleared when the negative pressure is high, and the soil that has entered the outer protective tube can be discharged when the plug opens the lower end of the outer protective tube.

[0009] The outer protective pipe has a structure that is smaller at the bottom and larger at the top, which can prevent exhaust gas and heat from being discharged through the gap between the outer wall of the outer protective pipe and the soil. Moreover, the larger gap between the middle conical section and the lower cylindrical section and the soil can achieve a larger soil heat exchange area and exhaust gas dissipation area. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the thermal desorption tube structure when it is inserted into the soil;

[0011] Figure 2 This is a structural diagram showing the outer sheath and core rod in their disassembled state.

[0012] Legend: 1. Outer protective tube; 11. Upper cylindrical section; 12. Middle conical section; 13. Lower cylindrical section; 14. Spiral guide plate; 15. Air inlet; 16. Limiting plate; 2. Core rod; 21. Plug; 22. Heating rod. Detailed Implementation

[0013] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0014] like Figure 1 and Figure 2As shown, it includes an outer protective tube 1 and a core rod 2. The upper end of the outer protective tube 1 has a guide sleeve, and the core rod 2 is longitudinally slidably connected inside the guide sleeve. The outer protective tube 1 includes an upper cylindrical section 11, a middle conical section 12, and a lower cylindrical section 13. The outer wall of the outer protective tube 1 has spiral guide plates 14 located in the middle conical section 12 and the lower cylindrical section 13. The outer diameter of the spiral guide plates 14 is the same as the outer diameter of the upper cylindrical section 11. The upper part of the core rod 2 is a hollow structure with a vent hole, which communicates with the inner cavity of the outer protective tube 1. The lower end of the core rod 2 has a plug 21 located at the lower end of the outer protective tube 1. A heating rod 22 is fixedly connected to the lower end of the plug 21. The middle conical section 12 and the lower cylindrical section 13 have air inlets 15. The top of the outer protective pipe 1 has a limiting plate 16, which is used to seal the hole and also to fix the sinking pipe to the ground. The heating rod 22 is electrically heated and is inserted into the soil below the hole.

[0015] In this scheme, the outer protective tube 1 can be used as a tool for expanding the hole. With a foundation hole, the outer protective tube 1 is lowered into the soil by screwing it in until the limiting plate 16 contacts the soil surface. After that, the outer protective tube 1 is rotated. Under the action of the spiral guide plate 14, the expanded soil can sink to the bottom of the hole, so that there are certain gaps between the spiral guide plates 14. This can increase the heat exchange area and efficiency, and also form a spiral air channel. The heating rod 22 is below the outer protective tube 1 and is further inserted into the soil. After heating the soil, the hot air rises. At the same time, the upper end of the vent is connected to a negative pressure air source to form a negative pressure inside the outer protective tube 1. Under the action of negative pressure, the hot air can be drawn away through the air inlet 15.

[0016] During the expansion process, the air inlet 15 is easily blocked by soil. At this time, the core rod 2 can be moved up and down intermittently to open the lower end of the outer protective tube 1 intermittently, so that the negative pressure inside the outer protective tube 1 is sometimes large and sometimes small. The air vent can be cleared when the negative pressure is large, and the soil that has entered the outer protective tube 1 can be discharged when the plug 21 opens the lower end of the outer protective tube 1.

[0017] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A thermal desorption tube structure for soil remediation, characterized in that, The device includes an outer protective tube (1) and a core rod (2). The upper end of the outer protective tube (1) has a guide sleeve. The core rod (2) is longitudinally slidably connected inside the guide sleeve. The outer protective tube (1) includes an upper cylindrical section (11), a middle conical section (12), and a lower cylindrical section (13). The outer wall of the outer protective tube (1) has spiral guide plates (14) located in the middle conical section (12) and the lower cylindrical section (13). The spiral guide plates (14) have... The outer diameter is the same as that of the upper cylindrical section (11). The upper part of the core rod (2) is a hollow structure with a vent hole. The vent hole is connected to the inner cavity of the outer protective tube (1). The lower end of the core rod (2) has a plug (21) located at the lower end of the outer protective tube (1). A heating rod (22) is fixedly connected to the lower end of the plug (21). The middle conical section (12) and the lower cylindrical section (13) have air inlets (15).

2. The thermal desorption tube structure for soil remediation according to claim 1, characterized in that, The top of the outer protective tube (1) has a limiting disc (16).

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