A high efficiency heat transfer device for thermal desorption soil remediation

Abstract

The utility model relates to the technical field of contaminated soil remediation device, and disclose a kind of for high-efficiency heat transfer device of thermal desorption soil remediation, the high-efficiency heat transfer device for thermal desorption soil remediation, including sealing cover, the bottom of the sealing cover is provided with heat cycle assembly.The high-efficiency heat transfer device for thermal desorption soil remediation, active push heat transfer oil circulation, break natural convection dependence, make heat transfer oil flow quickly and evenly, heat can be faster from heating zone conduction to soil contact area, realize efficient heat cycle system, oil temperature distribution is more uniform, avoid local overheating, pipe wall temperature difference big and other problems, radiation fin increases heat exchange surface area, larger area and soil contact, heat is more easily scattered, improve the heat flux in unit time, accelerate soil temperature, arc piece turbulence heat transfer oil flow path, form vortex or spiral flow, break the temperature boundary layer in oil, improve the heat flux between cylinder wall and heat transfer oil.

Description

Technical Field

[0001] This utility model relates to the technical field of contaminated soil remediation devices, specifically a high-efficiency heat transfer device for thermal desorption soil remediation. Background Technology

[0002] In-situ thermal desorption technology has played an important role in the remediation of organically contaminated soil. This technology heats the contaminated soil to above the boiling point of the target pollutants by means of steam, gas, resistance heating, or heat conduction heating. By controlling the system temperature and heating time, the pollutants are selectively volatilized, allowing the target pollutants to separate and be removed from the soil particles. After the pollutants are converted into a gaseous state, their mobility is greatly improved. The volatilized gaseous products are collected, captured, and then purified.

[0003] According to a heat transfer device for in-situ thermal desorption soil remediation (Announcement No.: CN210208077U), the above application includes a bottom-closed heat transfer pipe, the upper opening of the heat transfer pipe is covered with a sealing cover plate, and the heat transfer pipe contains a heat-conducting liquid; it also includes a heater and a thermometer, the heater and the thermometer respectively pass through the sealing cover plate and are immersed in the heat-conducting liquid at their bottoms.

[0004] However, the aforementioned heat transfer device relies on a resistance heater to heat the static heat transfer oil, and the heat transfer mainly depends on natural convection. This circulation speed is relatively slow, the temperature gradient inside the pipe is large, the heat transfer efficiency is low, the overall temperature of the heat transfer oil is uneven, and the temperature difference of the heat transfer pipe wall is large, resulting in uneven heating of the soil and affecting the remediation effect. In view of this, we propose a high-efficiency heat transfer device for thermal desorption soil remediation. Utility Model Content

[0005] The purpose of this invention is to provide a high-efficiency heat transfer device for thermal desorption soil remediation, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency heat transfer device for thermal desorption soil remediation, comprising a sealing cover plate, wherein a heat circulation assembly is disposed at the bottom of the sealing cover plate, and the heat circulation assembly comprises:

[0007] The outer cylinder has radial fins fixedly connected to its outer wall;

[0008] The inner cylinder has a groove on its side wall;

[0009] An electric motor, wherein a rotating shaft is fixedly connected to the output end of the motor, and an auger is fixedly connected to the side wall of the rotating shaft.

[0010] Preferably, a resistance heating tube is fixedly connected to the bottom end face of the sealing cover, and a temperature measuring sleeve is fixedly connected to the bottom end face of the sealing cover.

[0011] Preferably, the outer cylinder is fixedly connected to the bottom end face of the sealing cover plate, and the bottom of the outer cylinder is tapered.

[0012] Preferably, the inner cylinder is fixedly connected to the bottom of the sealing cover plate, and the slot connects the inside and outside of the inner cylinder, through which the heated heat transfer oil enters the space between the inner cylinder and the outer cylinder.

[0013] Preferably, the number of slots is set to several groups, and the several groups of slots are equally spaced around the outer wall of the inner cylinder.

[0014] Preferably, the motor is fixedly connected to the top end face of the sealing cover plate, and the auger has an L-shaped cross-section. The rotation of the auger transports the heat transfer oil located at the bottom upwards.

[0015] Preferably, the outer wall of the inner cylinder is fixedly connected with an arc-shaped piece, and the number of arc-shaped pieces is set to several groups, with the several groups of arc-shaped pieces surrounding the outer wall of the inner cylinder at equal intervals.

[0016] Compared with the prior art, this utility model provides a high-efficiency heat transfer device for thermal desorption soil remediation, which has the following beneficial effects:

[0017] 1. This high-efficiency heat transfer device for thermal desorption soil remediation actively promotes the circulation of heat transfer oil through a set heat circulation component, breaking the dependence on natural convection and enabling the heat transfer oil to flow quickly and evenly. Heat can be transferred from the heating zone to the soil contact zone more quickly, reducing heat retention and realizing a high-efficiency heat circulation system. The oil temperature distribution is more uniform, avoiding problems such as local overheating and large temperature difference between pipe walls. The radiant fins increase the heat exchange surface area, allowing for a larger contact area with the soil, making it easier for heat to dissipate, increasing the heat flux per unit time, and accelerating soil warming.

[0018] 2. This high-efficiency heat transfer device for thermal desorption soil remediation uses arc-shaped plates to turbulently flow the heat transfer oil, forming vortices or spiral flows. This causes the heat transfer oil to continuously scour the cylinder wall as it flows through the space between the inner and outer cylinders, increasing the heat transfer coefficient, breaking the temperature boundary layer in the oil, increasing the heat flux between the cylinder wall and the heat transfer oil, and accelerating the heat transfer speed. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the outer cylinder of this utility model;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the outer cylinder of this utility model;

[0022] Figure 4This is a schematic diagram of the cross-sectional structure of the inner cylinder of this utility model.

[0023] In the diagram: 1. Sealing cover; 2. Heat circulation assembly; 201. Outer cylinder; 202. Radiant fins; 203. Inner cylinder; 204. Groove; 205. Motor; 206. Shaft; 207. Screwdriver; 3. Resistance heating tube; 4. Temperature measuring sleeve; 5. Arc-shaped plate. Detailed Implementation

[0024] like Figures 1-4 As shown, this utility model provides a technical solution: a high-efficiency heat transfer device for thermal desorption soil remediation, including a sealing cover plate 1, and a heat circulation component 2 is provided at the bottom of the sealing cover plate 1. The heat circulation component 2 includes an outer cylinder 201, radiating fins 202, an inner cylinder 203, a slot 204, a motor 205, a rotating shaft 206, and an auger 207.

[0025] In one embodiment of the present invention, the outer cylinder 201 is fixedly connected to the bottom end face of the sealing cover plate 1, the bottom of the outer cylinder 201 is tapered, and the outer wall of the outer cylinder 201 is fixedly connected with radial fins 202.

[0026] The inner cylinder 203 is fixedly connected to the bottom of the sealing cover plate 1. The side wall of the inner cylinder 203 is provided with a slot 204, which connects the inside and outside of the inner cylinder 203. The heated heat transfer oil enters the space between the inner cylinder 203 and the outer cylinder 201 through the slot 204. Several sets of slots 204 are provided, and the several sets of slots 204 are equally spaced around the outer wall of the inner cylinder 203.

[0027] The motor 205 is fixedly connected to the top end face of the sealing cover plate 1. The output end of the motor 205 is fixedly connected to the rotating shaft 206. The side wall of the rotating shaft 206 is fixedly connected to the auger 207. The cross-section of the auger 207 is L-shaped. The rotation of the auger 207 will transport the heat transfer oil located at the bottom upward.

[0028] A resistance heating tube 3 is fixedly connected to the bottom end face of the sealing cover plate 1, and a temperature measuring sleeve 4 is fixedly connected to the bottom end face of the sealing cover plate 1. The resistance heating tube 3 heats the heat transfer oil inside the device, and the temperature measuring sleeve 4 is used to detect the real-time temperature of the heat transfer oil.

[0029] Motor 205 drives shaft 206 and auger 207 to rotate. The rotation of auger 207 transports the heat transfer oil at the bottom upwards, allowing the heat transfer oil to enter the space between outer cylinder 201 and inner cylinder 203 through slot 204. The heat transfer oil heats outer cylinder 201, further transferring heat to the external soil, causing pollutants to volatilize. After cooling, the heat transfer oil sinks and then re-enters inner cylinder 203 through the bottom, where it is reheated for a new round of heat circulation. This actively promotes the circulation of heat transfer oil, breaking the dependence on natural convection and allowing the heat transfer oil to flow quickly and evenly. Heat can be transferred from the heating zone to the soil contact zone more quickly, reducing heat retention and achieving a highly efficient heat circulation system. The oil temperature distribution is more uniform, avoiding problems such as local overheating and large temperature differences between pipe walls.

[0030] Radiation fins 202 are fixedly connected to the outer wall of the outer cylinder 201, which increases the heat exchange surface area, allows for greater contact with the soil, makes it easier for heat to dissipate, increases the heat flux per unit time, accelerates soil warming, and enhances thermal radiation capacity.

[0031] In addition, an arc-shaped plate 5 is fixedly connected to the outer wall of the inner cylinder 203. Several sets of arc-shaped plates 5 are arranged, and the sets of arc-shaped plates 5 are equally spaced around the outer wall of the inner cylinder 203, which turbulent the flow path of the heat transfer oil and form a vortex or spiral flow. This causes the heat transfer oil to continuously scour the cylinder wall when it flows through the space between the inner cylinder 203 and the outer cylinder 201, thereby increasing the heat transfer coefficient, breaking the temperature boundary layer in the oil, increasing the heat flux between the cylinder wall and the heat transfer oil, accelerating the heat transfer speed, and enabling more heat to be effectively transferred to the outer cylinder 201 and then to the soil.

[0032] In this invention, during use, the motor 205 drives the rotating shaft 206 and the auger 207 to rotate. The rotation of the auger 207 transports the heat transfer oil located at the bottom upwards, allowing the heat transfer oil to enter the space between the outer cylinder 201 and the inner cylinder 203 through the slot 204. The heat transfer oil heats the outer cylinder 201, further transferring heat to the external soil, causing pollutants to volatilize. After cooling, the heat transfer oil sinks and then re-enters the inner cylinder 203 through the bottom, where it is reheated for a new round of heat circulation. This actively promotes the circulation of the heat transfer oil, resulting in a more uniform oil temperature distribution and preventing local overheating and large temperature differences between the pipe walls. The outer wall of the outer cylinder 201 is fixedly connected with radiant fins 202, increasing the heat exchange surface area and allowing for greater contact with the soil, making it easier for heat to dissipate, increasing the heat flux per unit time, and accelerating soil warming.

[0033] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A high-efficiency heat transfer device for thermal desorption soil remediation, comprising a sealing cover plate (1), characterized in that: A heat circulation assembly (2) is provided at the bottom of the sealing cover plate (1), and the heat circulation assembly (2) includes: The outer cylinder (201) has radial fins (202) fixedly connected to its outer wall; The inner cylinder (203) has a slot (204) on its side wall. A motor (205) is provided, and a rotating shaft (206) is fixedly connected to the output end of the motor (205). An auger (207) is fixedly connected to the side wall of the rotating shaft (206).

2. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: A resistance heating tube (3) is fixedly connected to the bottom end face of the sealing cover (1), and a temperature measuring sleeve (4) is fixedly connected to the bottom end face of the sealing cover (1).

3. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: The outer cylinder (201) is fixedly connected to the bottom end face of the sealing cover plate (1), and the bottom of the outer cylinder (201) is tapered.

4. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: The inner cylinder (203) is fixedly connected to the bottom of the sealing cover plate (1), and the slot (204) connects the inside and outside of the inner cylinder (203).

5. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: The number of slots (204) is set in several groups, and the several groups of slots (204) are equally spaced around the outer wall of the inner cylinder (203).

6. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: The motor (205) is fixedly connected to the top end face of the sealing cover plate (1), and the cross-section of the auger (207) is L-shaped.

7. The high-efficiency heat transfer device for thermal desorption soil remediation according to claim 1, characterized in that: The outer wall of the inner cylinder (203) is fixedly connected with an arc-shaped piece (5), and the number of arc-shaped pieces (5) is set in several groups, with the several groups of arc-shaped pieces (5) surrounding the outer wall of the inner cylinder (203) at equal intervals.

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