Polluted soil microwave heating remediation device

Abstract

The utility model provides a contaminated soil microwave heating remediation device which comprises a heat preservation box, a magnetron, a rotating tray, a mixing drum and a tail gas treater, a sealing cover is arranged at the top of the heat preservation box, the rotating tray is rotationally connected into the heat preservation box, the mixing drum is connected above the rotating tray, a mixing assembly is arranged in the mixing drum, and the tail gas treater is connected with the magnetron. The magnetron is connected to the outer side of the heat preservation box and used for emitting microwaves into the heat preservation box to heat and repair the soil sample, and the tail gas processor is connected with the upper portion of the heat preservation box through an exhaust pipe. According to the microwave heating remediation device for the contaminated soil, microwave heating is conducted on a soil sample in the stirring barrel in the heat preservation box through the magnetron, the rotating tray drives the stirring barrel to rotate in the circumferential direction, the stirring assembly can further stir the soil sample, the disturbance effect on the soil sample is enhanced, the soil sample is heated more evenly under the effect of the magnetron, and the remediation effect is better. Various tail gases generated in the treatment process are conveyed into the tail gas treatment device through the exhaust pipe, so that the remediation efficiency of the soil sample is improved, and the remediation quality is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of contaminated soil treatment technology, and more specifically, it relates to a microwave heating remediation device for contaminated soil. Background Technology

[0002] Currently, during industrial relocation, contaminated soil in abandoned sites is generally treated using microwave thermal desorption technology. Microwave thermal desorption technology is widely used in research on the remediation of organically contaminated soils containing polycyclic aromatic hydrocarbons, benzene compounds, and petroleum hydrocarbons.

[0003] When researchers conduct scientific research, most of the laboratory microwave reactors are modified from household microwave ovens. However, these devices have a series of problems in the process of remediating organically contaminated soil, such as uneven heating, slow heating efficiency, and difficulty in collecting exhaust gas, which makes it difficult to accurately collect process parameters during the soil remediation process. Utility Model Content

[0004] The purpose of this invention is to provide a microwave heating remediation device for contaminated soil, which can uniformly heat soil samples, improve operational efficiency, and facilitate accurate collection of process parameters.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a microwave heating remediation device for contaminated soil is provided, including an insulated box, a magnetron, a rotating tray, a stirring cylinder, and an exhaust gas processor. The top of the insulated box is covered, the rotating tray is rotatably connected inside the insulated box, the stirring cylinder is connected above the rotating tray and is used to hold soil samples, and a stirring component is provided inside the stirring cylinder. The magnetron is connected to the outside of the insulated box and communicates with the inside of the insulated box, and is used to emit microwaves into the insulated box to heat and remediate the soil samples. The exhaust gas processor is connected to the upper part of the insulated box through an exhaust pipe.

[0006] In one possible implementation, there are two magnetrons, namely a low-frequency magnetron and a high-frequency magnetron, which are symmetrically arranged on both sides of the heat preservation box. The low-frequency magnetron is used to emit low-frequency microwaves into the heat preservation box to heat the soil sample at low frequency, and the high-frequency magnetron is used to emit high-frequency microwaves into the heat preservation box to heat the soil sample at high frequency.

[0007] In some embodiments, the low-frequency magnetron is connected to the insulation box via a first microwave waveguide, and the high-frequency magnetron is connected to the insulation box via a second microwave waveguide. Cooling fans are respectively provided on the sides of the low-frequency magnetron and the high-frequency magnetron.

[0008] In some embodiments, the first microwave waveguide is connected to one side of the insulation box via a first adapter, and the second microwave waveguide is connected to the other side of the insulation box via a second adapter.

[0009] In one possible implementation, the top of the cover is provided with a first rotary drive for driving the stirring assembly to rotate. The first rotary drive has a first output shaft that extends downward through the cover. The stirring assembly includes a stirring shaft and a stirring arm. The stirring shaft is connected to the lower end of the first output shaft and extends into the stirring drum. The stirring arm is connected to the lower end of the stirring shaft, and both ends of the stirring arm extend outward and upward in an arc shape.

[0010] In one possible implementation, a second rotary drive is provided at the bottom of the insulated box. The second rotary drive has a second output shaft that extends upward and penetrates the bottom wall of the insulated box. The second output shaft of the second rotary drive is connected to the bottom of the rotating tray and is used to drive the rotating tray to rotate.

[0011] In one possible implementation, an exhaust fan is provided on the side of the insulation box, and the exhaust side of the exhaust fan is connected to the exhaust pipe. The exhaust fan is used to draw in the exhaust gas in the insulation box so that the exhaust gas is sent to the exhaust gas processor through the exhaust pipe.

[0012] In one possible implementation, the contaminated soil microwave heating remediation device further includes a controller, a control display electrically connected to the controller, and a switch button on the control display. The switch button is used to send a switch signal to the controller, and the controller is used to send a switch command to the magnetron to turn the magnetron on or off.

[0013] In some embodiments, the control display is further provided with adjustment buttons, which are used to send adjustment signals to the controller, and the controller is used to send adjustment commands to the magnetron to adjust the power of the magnetron.

[0014] In some embodiments, the insulated box is equipped with a temperature sensor for detecting the temperature inside the insulated box. The temperature sensor is electrically connected to the controller and is used to send temperature parameters to the controller. The control display is equipped with a display screen for displaying the temperature parameters.

[0015] Compared with the prior art, the solution shown in this application embodiment uses a magnetron to microwave heat the soil sample in the mixing drum of the insulated box. The rotating tray drives the mixing drum to rotate circumferentially, and the mixing component can further stir the soil sample, enhance the disturbance effect on the soil sample, and make it more uniformly heated under the action of the magnetron. Various exhaust gases generated during the process are sent to the exhaust gas processor through the exhaust pipe, avoiding environmental pollution caused by exhaust gas discharge, improving the soil sample remediation efficiency, and ensuring its remediation quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the microwave heating remediation device for contaminated soil provided in this embodiment of the utility model;

[0018] Figure 2 This is an embodiment of the present utility model. Figure 1 A partially enlarged structural diagram of section I;

[0019] Figure 3 This is an embodiment of the present utility model. Figure 1 A magnified schematic diagram of the central control display;

[0020] Figure 4 A control principle diagram of the microwave heating remediation device for contaminated soil provided in this embodiment of the utility model.

[0021] The following are the labeling elements in the figure:

[0022] 1. Insulated box; 11. Lid; 21. Low-frequency magnetron; 22. High-frequency magnetron; 23. First microwave waveguide; 24. Second microwave waveguide; 25. Cooling fan; 26. First adapter; 27. Second adapter; 3. Rotating tray; 4. Stirring drum; 41. Stirring shaft; 42. Stirring arm; 43. First rotary drive component; 5. Exhaust gas processor; 51. Exhaust fan; 52. Exhaust pipe; 6. Second rotary drive component; 71. Control display; 72. Switch button; 73. Adjustment button; 74. Display screen; 75. Temperature sensor; 76. Controller; 77. Encoder. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships 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. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 4 The present invention provides a microwave heating remediation device for contaminated soil. The device includes an insulated box 1, a magnetron, a rotating tray 3, a stirring cylinder 4, and an exhaust gas processor 5. The top of the insulated box 1 is covered with a cap 11. The rotating tray 3 is rotatably connected inside the insulated box 1. The stirring cylinder 4 is connected above the rotating tray 3 and is used to hold soil samples. A stirring assembly is provided inside the stirring cylinder 4. The magnetron is connected to the outside of the insulated box 1 and communicates with the inside of the insulated box 1, and is used to emit microwaves into the insulated box 1 to heat and remediate the soil samples. The exhaust gas processor 5 is connected to the upper part of the insulated box 1 through an exhaust pipe 52.

[0026] Compared with the prior art, the microwave heating remediation device for contaminated soil provided in this embodiment uses a magnetron to microwave heat the soil sample in the stirring drum 4 of the insulation box 1. The rotating tray 3 drives the stirring drum 4 to rotate circumferentially, and the stirring component can further stir the soil sample, enhance the disturbance effect on the soil sample, and make it more uniformly heated under the action of the magnetron. Various exhaust gases generated during the process are sent to the exhaust gas processor 5 through the exhaust pipe 52, avoiding environmental pollution caused by exhaust gas discharge, improving the remediation efficiency of the soil sample, and ensuring its remediation quality.

[0027] In this embodiment, an insulated box 1 is used to house the mixing drum 4. The insulated box 1 is made of heat-insulating material, which has good heat preservation performance and avoids energy loss. While the mixing drum 4 is rotated by the rotating tray 3, the soil sample inside the mixing drum 4 is further disturbed by the stirring component, so that the soil sample can be heated evenly, which helps to ensure the quality of soil remediation and improve its remediation efficiency.

[0028] It should be noted that a magnetron is an electrovacuum device used to generate microwave energy. Within the magnetron, electrons, under the control of mutually perpendicular constant magnetic and electric fields, interact with a high-frequency electromagnetic field, converting energy obtained from the constant electric field into microwave energy, thus achieving the purpose of generating microwave energy.

[0029] Specifically, the magnetron can be either a low-frequency magnetron 21 or a high-frequency magnetron 22, or both can be used simultaneously. This allows for convenient selection of the appropriate heating method based on experimental needs, resulting in effective heating of the soil sample. This facilitates targeted research and the achievement of soil remediation effects.

[0030] In one possible implementation, please refer to Figures 1 to 4 There are two magnetrons, namely a low-frequency magnetron 21 and a high-frequency magnetron 22. The low-frequency magnetron 21 and the high-frequency magnetron 22 are symmetrically arranged on both sides of the heat preservation box 1. The low-frequency magnetron 21 is used to emit low-frequency microwaves into the heat preservation box 1 to heat the soil sample at low frequency, and the high-frequency magnetron 22 is used to emit high-frequency microwaves into the heat preservation box 1 to heat the soil sample at high frequency.

[0031] In this embodiment, the low-frequency magnetron 21 and the high-frequency magnetron 22 are respectively connected to the insulation box 1. They are symmetrically arranged on both sides of the insulation box 1, which facilitates spatial arrangement and operation by the test personnel. For ease of operation, the low-frequency magnetron 21 and the high-frequency magnetron 22 can also be marked with labels for easy identification and use.

[0032] In some embodiments, please refer to Figures 1 to 4 The low-frequency magnetron 21 is connected to the heat preservation box 1 through the first microwave waveguide 23, and the high-frequency magnetron 22 is connected to the heat preservation box 1 through the second microwave waveguide 24. Cooling fans 25 are respectively provided on the side of the low-frequency magnetron 21 and the high-frequency magnetron 22.

[0033] In this embodiment, since the microwaves generated by the magnetron have extremely high frequencies and generally operate in the centimeter wave or millimeter wave band, transmitting them with ordinary cables or wires would result in significant losses. Therefore, the microwave feed uses a metal pipe with a rectangular or circular cross-section, also known as a waveguide.

[0034] Specifically, the low-frequency magnetron 21 is connected to the heat preservation box 1 via the first microwave waveguide 23, and the low-frequency magnetron 21 is connected to the heat preservation box 1 via the second microwave waveguide 24. The low-frequency microwave is sent into the heat preservation box 1 via the first microwave waveguide 23, and the high-frequency microwave is sent into the heat preservation box 1 via the second microwave waveguide 24, thereby achieving the heating treatment of the soil sample.

[0035] In addition, to prevent the low-frequency magnetron 21 and the high-frequency magnetron 22 from overheating and affecting their normal operation, cooling fans 25 are installed on the outside of each magnetron for cooling. Specifically, the low-frequency magnetron 21 and the high-frequency magnetron 22 are respectively housed in a closed enclosure, and the cooling fan 25 is also located inside the enclosure, on the side away from the insulation box 1. This allows the fan to disturb the airflow around the low-frequency magnetron 21 and the high-frequency magnetron 22, achieving a good cooling effect.

[0036] In some embodiments, please refer to Figures 1 to 4 The first microwave waveguide 23 is connected to one side of the insulated box 1 via a first adapter 26, and the second microwave waveguide 24 is connected to the other side of the insulated box 1 via a second adapter 27. The first microwave waveguide 23 is connected to one side of the insulated box 1 via the first adapter 26, which ensures the reliability of the connection between the first microwave waveguide 23 and the insulated box 1. Similarly, the second adapter 27 ensures the reliability of the connection between the second microwave waveguide 24 and the insulated box 1, thereby satisfying the requirement for effective heating of the soil sample inside the insulated box 1.

[0037] In one possible implementation, please refer to Figures 1 to 4 The top of the cover 11 is provided with a first rotary drive 43 for driving the stirring assembly to rotate. The first rotary drive 43 has a first output shaft that extends downward through the cover 11. The stirring assembly includes a stirring shaft 41 and a stirring arm 42. The stirring shaft 41 is connected to the lower end of the first output shaft and extends into the stirring cylinder 4. The stirring arm 42 is connected to the lower end of the stirring shaft 41. Both ends of the stirring arm 42 extend outward and upward in an arc shape.

[0038] In this embodiment, the stirring shaft 41 is driven to rotate by the first rotating drive component 43. The first rotating drive component 43 can be a motor or other power component, which can drive the stirring shaft 41 to rotate and then use its outer stirring arm 42 to effectively disturb the soil. Combined with the rotation drive of the rotating tray 3, the uniformity of soil heating is further improved, which facilitates the improvement of experimental efficiency.

[0039] In one possible implementation, please refer to Figures 1 to 4 The bottom of the heat preservation box 1 is provided with a second rotary drive 6. The second rotary drive 6 has a second output shaft that extends upward and passes through the bottom wall of the heat preservation box 1. The second output shaft of the second rotary drive 6 is connected to the bottom of the rotating tray 3 and is used to drive the rotating tray 3 to rotate.

[0040] In this embodiment, the second rotary drive 6 drives the rotating tray 3 to rotate, thereby causing the stirring cylinder 4 mounted on the rotating tray 3 to rotate synchronously. Specifically, in order to ensure the stability of the relative position between the stirring cylinder 4 and the rotating tray 3, the rotating tray 3 is provided with a mounting ring that can be fitted onto the outer periphery of the stirring cylinder 4, thereby limiting the horizontal position of the stirring cylinder 4.

[0041] Based on this, a set screw that can abut against the circumference of the mixing cylinder 4 can be installed through the mounting collar to reliably fix the mixing cylinder 4 above the rotating tray 3 and prevent the mixing cylinder 4 from shifting. In addition, an annular track can be installed on the inner bottom wall of the insulation, and a slider that cooperates with the annular track is provided at the bottom of the rotating tray 3 so that the bottom of the rotating tray 3 can be effectively supported and prevent it from tipping over.

[0042] In one possible implementation, please refer to Figures 1 to 4 The side of the insulation box 1 is equipped with an exhaust fan 51. The exhaust side of the exhaust fan 51 is connected to the exhaust pipe 52. The exhaust fan 51 is used to draw out the exhaust gas in the insulation box 1 so that the exhaust gas is sent to the exhaust gas processor 5 through the exhaust pipe 52.

[0043] In this embodiment, the exhaust fan 51 on the side of the insulation box 1 can draw the polluted gas inside the insulation box 1 outward, and guide the exhaust gas to the exhaust gas processor through the exhaust pipe 52. The exhaust gas processor can preliminarily purify the exhaust gas before discharging it, thus avoiding environmental pollution caused by direct discharge.

[0044] In one possible implementation, please refer to Figures 1 to 4 The contaminated soil microwave heating remediation device also includes a controller 76, a control display 71 electrically connected to the controller 76, and a switch button 72 provided on the control display 71. The switch button 72 is used to send a switch signal to the controller 76, and the controller 76 is used to send a switch command to the magnetron to turn the magnetron on or off.

[0045] In this embodiment, the magnetron is switched on and off by setting a switch button 72 on the control display 71. The controller 76 can transmit the switch command to the magnetron to realize the magnetron's opening and closing. When a low-frequency magnetron 21 and a high-frequency magnetron 22 are respectively set on both sides of the insulation box 1, two switch buttons 72 are also set accordingly to realize the corresponding control of the low-frequency magnetron 21 and the high-frequency magnetron 22.

[0046] Furthermore, the control display 71 is also equipped with an adjustment button 73. The adjustment button 73 is used to send an adjustment signal to the controller 76, and the controller 76 is used to send an adjustment command to the magnetron to adjust the power of the magnetron. The adjustment button 73 can adjust the power of the magnetron to realize the soil sample processing under different power states. When a low-frequency magnetron 21 and a high-frequency magnetron 22 are respectively set on both sides of the insulation box 1, two adjustment buttons 73 are also set accordingly to realize the corresponding control of the low-frequency magnetron 21 and the high-frequency magnetron 22.

[0047] In some embodiments, please refer to Figures 1 to 4 The insulation box 1 is equipped with a temperature sensor 75 for detecting the temperature inside the insulation box 1. The temperature sensor 75 is electrically connected to the controller 76 and is used to send temperature parameters to the controller 76. The control display 71 is equipped with a display screen 74 for displaying the temperature parameters. The temperature sensor 75 can effectively monitor the temperature inside the insulation box 1 and feed it back to the controller 76. The real-time temperature is displayed on the display screen 74, which makes it easy for operators to keep track of the temperature status inside the insulation box 1 at all times.

[0048] Based on this, the rotational speed of the rotating tray 3 can be detected by setting an encoder 77. The encoder 77 is electrically connected to the controller 76, and the speed of the rotating tray 3 can be displayed on the display screen 74, making it easy for operators to understand various parameters. At the same time, control buttons for controlling the second rotary drive 6 can be set on the control display 71, making it easy for operators to adjust the rotational speed of the rotating tray 3.

[0049] The above-mentioned device can excite microwaves of different frequencies through low-frequency magnetron 21 and high-frequency magnetron 22 to feed into the soil sample in the mixing drum 4. It can realize different modes such as low-frequency microwave heating, high-frequency microwave heating and high-low frequency microwave combined heating, which is convenient for studying multiple parameters in the soil sample processing process and has high application value.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for microwave heating remediation of contaminated soil, characterized in that, The utility model relates to a soil sample microwave heating and repairing device, including incubator (1), magnetron, rotating tray (3), stirring cylinder (4) and tail gas treater (5), the top of incubator (1) is equipped with the cover (11), rotating tray (3) rotation is connected in incubator (1), the top of rotating tray (3) is connected with stirring cylinder (4) for containing soil sample, be equipped with stirring assembly in stirring cylinder (4), magnetron is connected with the outside of incubator (1) with inside communication of incubator (1), for emitting microwave to incubator (1) in with heating and repairing soil sample, tail gas treater (5) is connected with the upper portion of incubator (1) through exhaust pipe (52).

2. The apparatus for microwave heating remediation of contaminated soil according to claim 1, wherein, Two magnetrons are arranged, and the two magnetrons are a low-frequency magnetron (21) and a high-frequency magnetron (22), respectively, the low-frequency magnetron (21) and the high-frequency magnetron (22) are symmetrically arranged on both sides of the incubator (1), the low-frequency magnetron (21) is used for emitting low-frequency microwave into the incubator (1) to heat the soil sample at low frequency, and the high-frequency magnetron (22) is used for emitting high-frequency microwave into the incubator (1) to heat the soil sample at high frequency.

3. The apparatus for microwave heating remediation of contaminated soil as claimed in claim 2, wherein, The low-frequency magnetron (21) and the incubator (1) are connected through a first microwave waveguide (23), the high-frequency magnetron (22) and the incubator (1) are connected through a second microwave waveguide (24), and the sides of the low-frequency magnetron (21) and the high-frequency magnetron (22) are respectively provided with cooling fans (25).

4. The apparatus for microwave heating remediation of contaminated soil as claimed in claim 3, wherein, The first microwave waveguide (23) is connected to one side of the incubator (1) through a first adapter (26), and the second microwave waveguide (24) is connected to the other side of the incubator (1) through a second adapter (27).

5. The apparatus for microwave heating remediation of contaminated soil as claimed in claim 1, wherein, The top of the cover (11) is provided with a first rotary drive (43) for driving the stirring assembly to rotate, the first rotary drive (43) has a first output shaft penetrating downwardly through the cover (11), the stirring assembly includes a stirring shaft (41) and a stirring arm (42), the stirring shaft (41) is connected to the lower end of the first output shaft and extends into the stirring cylinder (4), and the stirring arm (42) is connected to the lower end of the stirring shaft (41), and the two ends of the stirring arm (42) extend outwardly and upwardly in an arc shape.

6. The apparatus for microwave heating remediation of contaminated soil of claim 1, wherein, The bottom of the incubator (1) is provided with a second rotary drive (6), the second rotary drive (6) has a second output shaft extending upwardly and penetrating through the bottom wall of the incubator (1), the second output shaft of the second rotary drive (6) is connected to the bottom of the rotating tray (3) for driving the rotating tray (3) to rotate.

7. The apparatus for microwave heating remediation of contaminated soil of claim 1, wherein, The side of the incubator (1) is provided with an air suction fan (51), the air outlet side of the air suction fan (51) is connected to the exhaust pipe (52), and the air suction fan (51) is used for sucking waste gas in the incubator (1) to send the waste gas to the tail gas treater (5) through the exhaust pipe (52).

8. The apparatus for microwave heating remediation of contaminated soil according to any one of claims 1 to 7, wherein, The device for remediation of contaminated soil by microwave heating further comprises a controller (76), a control display (71) electrically connected to the controller (76), and a switch button (72) arranged on the control display (71), wherein the switch button (72) is configured to send a switch signal to the controller (76), and the controller (76) is configured to send a switch instruction to the magnetron to turn on or turn off the magnetron.

9. The apparatus for microwave heating remediation of contaminated soil according to claim 8, wherein, The control display (71) is further provided with an adjusting button (73), wherein the adjusting button (73) is configured to send an adjusting signal to the controller (76), and the controller (76) is configured to send an adjusting instruction to the magnetron to adjust the power of the magnetron.

10. The apparatus for microwave heating remediation of contaminated soil according to claim 8, wherein, The heat preservation box (1) is provided with a temperature sensor (75) for detecting the temperature in the heat preservation box (1), wherein the temperature sensor (75) is electrically connected to the controller (76) and configured to send a temperature parameter to the controller (76), and the control display (71) is provided with a display screen (74) for displaying the temperature parameter.

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