Thermal desorption device for soil organic matters

Abstract

The utility model relates to the technical field of soil remediation, and provides a soil organic matter thermal desorption device which comprises a low-temperature bin, a first thermal generator, a high-temperature bin, a second thermal generator and a conveying mechanism, the low-temperature bin is provided with a first gas inlet, and a high-temperature gas outlet of the first heat generator is connected with the first gas inlet, so that volatile organic compounds are desorbed from soil in the low-temperature bin; the conveying mechanism is installed between a discharging port of the low-temperature bin and a feeding port of the high-temperature bin and conveys soil from the low-temperature bin to the high-temperature bin. The high-temperature bin is provided with a second gas inlet, and a high-temperature gas outlet of the second heat generator is connected with the second gas inlet, so that the soil desorbs semi-volatile organic compounds in the high-temperature bin. According to the soil thermal desorption device, the desorption effect of soil organic matters is improved, and the initial temperature of the soil entering the high-temperature bin is higher, so that the soil can complete the desorption of semi-volatile organic matters in a shorter time, the energy consumption of the whole soil thermal desorption device is reduced, and the soil remediation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to soil remediation technical field especially relates to a soil organic matter thermal desorption device. BACKGROUND

[0002] Soil is the final destination of various pollutants, and a large number of pollutants accumulated in the soil has become one of the main environmental problems. Volatile organic compounds or semi-volatile organic compounds pollute the soil after entering the soil, and cause secondary pollution to surface water and groundwater, directly or indirectly endangering human health. Therefore, soil remediation is imperative. Thermal desorption technology, as an important technology in soil remediation technology, has good remediation effect for organic matter contaminated soil.

[0003] At present, in order to realize the desorption of volatile organic compounds and semi-volatile organic compounds in organic matter contaminated soil, hot air is mixed with organic matter contaminated soil in a desorption chamber to complete the volatilization of volatile organic compounds and semi-volatile organic compounds in soil. This method needs to ensure that the soil has very sufficient heating time, which leads to the increase of thermal power consumption of the thermal desorption device, and further increases the remediation cost of organic matter contaminated soil. SUMMARY

[0004] The utility model provides a soil organic matter thermal desorption device to solve the prior art soil organic matter thermal desorption device has the problems of large thermal power consumption and high soil remediation cost.

[0005] The utility model provides a soil organic matter thermal desorption device, which comprises a low-temperature bin, a first heat generator, a high-temperature bin, a second heat generator and a conveying mechanism.

[0006] According to the soil organic matter thermal desorption device provided by the utility model, the first heat generator is a steam heat generator or a solar heat generator; and / or,

[0007] The second heat generator is an electric heater or a gas heat generator.

[0008] The utility model provides a kind of soil organic matter thermal desorption device, still includes waste gas collecting mechanism, the low-temperature bin is equipped with waste gas collecting port and first waste gas outlet, the high-temperature bin is equipped with second waste gas outlet, the first waste gas outlet and the second waste gas outlet are communicated with the waste gas collecting port respectively by the waste gas collecting mechanism.

[0009] The utility model provides a kind of soil organic matter thermal desorption device, the waste gas collecting mechanism includes first collecting pipe and second collecting pipe, the import end and export end of the first collecting pipe are connected with the first waste gas outlet and the waste gas collecting port respectively;The import end and export end of the second collecting pipe are connected with the second waste gas outlet and the waste gas collecting port respectively.

[0010] The utility model provides a kind of soil organic matter thermal desorption device, the waste gas collecting mechanism still includes first connecting pipe, second connecting pipe, tail gas discharge pipe and three-way valve, the first collecting pipe and the second collecting pipe are connected with the first connecting pipe, the first connecting pipe is connected with the second connecting pipe and the tail gas discharge pipe respectively by the three-way valve, the export end of the second connecting pipe is connected to the waste gas collecting port.

[0011] The utility model provides a kind of soil organic matter thermal desorption device, the first collecting pipe and the second collecting pipe are equipped with pressurized fan.

[0012] The utility model provides a kind of soil organic matter thermal desorption device, the three-way valve is distribution type three-way regulating valve, heat insulating piece and baroceptor are installed in the low-temperature bin, the baroceptor is installed in the inside of the heat insulating piece, the baroceptor is used to detect the air pressure in the low-temperature bin, the baroceptor and distribution type three-way regulating valve communication connection.

[0013] The utility model provides a kind of soil organic matter thermal desorption device, the low-temperature bin is equipped with first push mechanism, the push device includes driving part, pivot and spiral plate, the pivot is inserted in the low-temperature bin, the spiral plate is located in the low-temperature bin and is fixed to the pivot, the spiral plate is according to preset length and extends along the axial direction of the pivot, the driving end of the driving part is connected with the pivot, the spiral plate is pushed to the discharge port of the low-temperature bin under the driving of the pivot;

[0014] The high-temperature bin is equipped with second push mechanism, and the specific structure of the second push mechanism is same with the first push mechanism.

[0015] The utility model provides a kind of soil organic matter thermal desorption device, the conveying mechanism includes conveyor belt and heat preservation cylinder, the both ends of the heat preservation cylinder are connected with the low-temperature bin and the high-temperature bin respectively, the conveyor belt is installed in the inside of the heat preservation cylinder.

[0016] The utility model provides a kind of soil organic matter thermal desorption device, the heat preservation cylinder is any one of rock wool heat preservation cylinder, ceramic fiber heat preservation cylinder, aluminium silicate heat preservation cylinder or glass wool heat preservation cylinder.

[0017] The utility model provides a kind of soil organic matter thermal desorption device, the high-temperature gas outlet of first heat generator is connected with first air inlet, high-temperature steam is passed into low-temperature bin, and soil completes the desorption of volatile organic matter under the heating of high-temperature steam;Conveying mechanism is installed between the discharge port of low-temperature bin and the feeding port of high-temperature bin, and soil is conveyed from low-temperature bin to high-temperature bin;The high-temperature gas outlet of second heat generator is connected with second air inlet, and higher temperature gas is passed into high-temperature bin, and soil completes the desorption of semi-volatile organic matter under the higher temperature environment of high-temperature bin.The utility model discloses by low-temperature bin and high-temperature bin step-by-step desorption, improve the desorption effect of soil organic matter, and due to the heating effect of first heat generator, the initial temperature of soil entering high-temperature bin is higher, so that soil can complete the desorption of semi-volatile organic matter in shorter time, that is, the residence time of soil in ultrahigh temperature environment is short, the working time of high-temperature bin and second heat generator is shortened, the operation power consumption of second heat generator is reduced, and then the energy consumption of entire soil thermal desorption device is reduced, and the cost of soil repair is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will be to the embodiment or prior art description needed to use a simple introduction to the drawings, obviously, the following description in the drawings is some embodiments of the utility model, for those skilled in the art, without creating labor, according to these drawings, other drawings can also be obtained.

[0019] Figure 1 It is the overall structure schematic diagram of the soil organic matter thermal desorption device provided by the utility model.

[0020] Reference signs:

[0021] 1, low-temperature bin;11, first air inlet;12, discharge port;13, waste gas collection port;14, first waste gas outlet;15, feeding hopper;

[0022] 2, first heat generator;3, high-temperature bin;31, feeding port;32, second air inlet;33, second waste gas outlet;34, unloading port;

[0023] 4, second heat generator; 5, conveying mechanism; 51, conveying belt; 52, heat preservation cylinder;

[0024] 6, waste gas collecting mechanism; 61, first collecting pipe; 62, second collecting pipe; 63, first connecting pipe; 64, second connecting pipe; 65, tail gas discharge pipe; 66, three-way valve; 67, pressure fan; 68, tail gas processor;

[0025] 7, first pushing mechanism; 71, driving piece; 72, rotating shaft; 73, spiral plate; 8, second pushing mechanism. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] The features of the terms "first", "second" in the description and claims of the present application can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0028] In the description of the present application, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0030] The following is combined Figure 1 The present invention provides a detailed description of a soil organic matter thermal desorption device through specific embodiments and application scenarios.

[0031] like Figure 1 As shown, this utility model provides a soil organic matter thermal desorption device, including: a low-temperature chamber 1, a first heat generator 2, a high-temperature chamber 3, a second heat generator 4, and a conveying mechanism 5. The low-temperature chamber 1 is provided with a first air inlet 11. The high-temperature gas outlet of the first heat generator 2 is connected to the first air inlet 11, allowing the soil to desorb volatile organic compounds in the low-temperature chamber 1. The conveying mechanism 5 is installed between the discharge port 12 of the low-temperature chamber 1 and the inlet 31 of the high-temperature chamber 3, conveying the soil from the low-temperature chamber 1 to the high-temperature chamber 3. The high-temperature chamber 3 is provided with a second air inlet 32. The high-temperature gas outlet of the second heat generator 4 is connected to the second air inlet 32, allowing the soil to desorb semi-volatile organic compounds in the high-temperature chamber 3.

[0032] Understandably, this invention employs thermal desorption technology to desorb organic matter from soil, achieving soil remediation. Organic matter in soil is divided into volatile organic compounds (VOCs) and semi-volatile organic compounds (SOCs). VOCs include substances such as benzene, toluene, and ethylbenzene. These VOCs are more volatile than SOCs and can be completely desorbed from the soil at approximately 300°C, resulting in lower heat consumption. Semi-volatile organic compounds include substances such as polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides, organophosphorus pesticides, polychlorinated biphenyls (PCBs), and polychlorinated alkenes (PCEs). These substances have high toxicity and long-term environmental persistence, causing serious soil pollution. The thermal desorption conditions for SOCs are more stringent, requiring temperatures above 600°C to ensure optimal desorption efficiency, resulting in higher heat consumption. Under the same operating time, the heat consumption for SOC desorption is several times that of VOC desorption. This invention uses a low-temperature chamber 1 and a high-temperature chamber 2 to desorb volatile organic compounds and semi-volatile organic compounds in the soil, respectively. While improving the desorption effect, it reduces the desorption time of semi-volatile organic compounds and shortens the running time of the high-power second heat generator, thereby reducing the energy consumption of the soil organic matter thermal desorption device.

[0033] Specifically, such as Figure 1As shown, the first air inlet 11 is arranged at the head of the low-temperature bin 1. The high-temperature gas outlet of the first heat generator 2 and the first air inlet 11 are communicated through a steam pipeline. The first heat generator 2 heats the steam to 300 DEG C and discharges into the low-temperature bin 1 through the steam pipeline. The head of the low-temperature bin 1 is provided with a feeding hopper 15. The soil to be desorbed is discharged from the feeding hopper 15 into the low-temperature bin 1 and completes the desorption of the soil volatile organic matter under the heating of the high-temperature steam. The soil can be added to the feeding hopper 15 in batches or continuously and slowly transported to the feeding hopper 15 by using a material pump to increase the contact area of the soil and the high-temperature steam and ensure that the soil has a better desorption effect.

[0034] As shown, Figure 1 The discharge port 12 is arranged at the tail of the low-temperature bin 1, and the effective desorption of the volatile organic matter is realized in the process that the soil moves from the head of the low-temperature bin 1 to the tail of the low-temperature bin 1. The second air inlet 32 and the feeding port 31 of the high-temperature bin 3 are both arranged at the head of the high-temperature bin 3. The high-temperature gas outlet of the second heat generator 4 and the second air inlet 32 are communicated through a steam pipeline. The second heat generator 4 heats the gas to above 600 DEG C and discharges into the high-temperature bin 3 through the steam pipeline.

[0035] The soil desorbed of the volatile organic matter is discharged from the discharge port 12 and enters the high-temperature bin 3 under the conveying of the conveying mechanism 5. The soil completes the desorption of the semi-volatile organic matter in the high-temperature environment above 600 DEG C. In the traditional desorption mode, the soil at room temperature is directly heated to above 600 DEG C in a single desorption bin, the heat generator connected to the desorption bin needs to be operated at high power consumption in the whole cycle to meet the thermal desorption condition above 600 DEG C, and the soil of a large tonnage is accumulated in the single desorption bin, so that the heat generator needs to be operated for a longer time to ensure the sufficiency of the semi-volatile reaction. In the utility model, due to the heating effect of the first heat generator 2, the initial temperature of the soil entering the high-temperature bin 3 is close to 300 DEG C, so that the soil of the same tonnage can complete the desorption of the semi-volatile organic matter in a shorter time, that is, the operation time of the second heat generator 4 is shortened, and the operation power consumption of the second heat generator 4 is reduced.

[0036] It should be noted that, compared with the above-mentioned traditional mode, the utility model adds the heat power consumption of the first heat generator, but the temperature requirement of the low-temperature bin is low, the first heat generator with low power consumption greatly shortens the operation time of the second heat generator with high power consumption, and thus the overall heat power consumption of the soil organic matter thermal desorption device is reduced.

[0037] This invention provides a soil organic matter thermal desorption device. A first heat generator 2 has its high-temperature gas outlet and first air inlet 11 connected, allowing high-temperature steam to be introduced into a low-temperature chamber 1. The soil undergoes desorption of volatile organic compounds under the heating effect of the high-temperature steam. A conveying mechanism 5 is installed between the outlet 12 of the low-temperature chamber 1 and the inlet 31 of the high-temperature chamber 3, conveying the soil from the low-temperature chamber 1 to the high-temperature chamber 3. A second heat generator 4 has its high-temperature gas outlet and second air inlet 32 ​​connected, allowing even higher-temperature gas to be introduced into the high-temperature chamber 3. Under the higher temperature environment of the high-temperature chamber 3, the soil undergoes desorption of semi-volatile organic compounds. This invention improves the soil desorption effect through staged desorption in the low-temperature chamber 1 and high-temperature chamber 3. Due to the heating effect of the first heat generator 2, the initial temperature of the soil entering the high-temperature chamber 3 is relatively high, enabling the soil to complete the desorption of semi-volatile organic compounds in a shorter time. This shortens the working time of the high-temperature chamber 3 and the second heat generator 4, reduces the operating power consumption of the second heat generator 4, and thus reduces the energy consumption of the entire soil thermal desorption device, thereby reducing the cost of soil remediation.

[0038] In some embodiments, the first heat generator 2 is a steam heat generator or a solar heat generator. Steam heat generators or solar heat generators are suitable for heating steam to approximately 300°C, generating a large amount of steam while consuming relatively little heat.

[0039] The second heat generator 4 is an electric heater or a gas-fired heat generator. The electric heater or gas-fired heat generator is suitable for heating steam to above 600℃, producing high heat output, which can meet the heating and desorption requirements of semi-volatile organic compounds in the soil.

[0040] In some embodiments, such as Figure 1 As shown, the soil organic matter thermal desorption device also includes a waste gas collection mechanism 6. The low-temperature chamber 1 is provided with a waste gas collection port 13 and a first waste gas outlet 14. The high-temperature chamber 3 is provided with a second waste gas outlet 33. The first waste gas outlet 14 and the second waste gas outlet 33 are respectively connected to the waste gas collection port 13 through the waste gas collection mechanism 6.

[0041] Specifically, such as Figure 1 As shown, the waste gas collection port 13 is located at the head of the cryogenic chamber 1. The first waste gas outlet 14 is located at the tail of the cryogenic chamber 1. After volatile organic compounds undergo a volatilization reaction in the cryogenic chamber 1, the waste heat is discharged from the first waste gas outlet. After semi-volatile organic compounds undergo a volatilization reaction in the high-temperature chamber 3, the waste heat is discharged from the second waste gas outlet.

[0042] The waste gas collection mechanism 6 is used to collect the waste heat gas discharged from the first and second waste gas ports and return the waste heat gas to the low-temperature chamber 1. The waste heat gas is used as a heat source to reheat the soil, thereby reducing the energy consumption of the first heat generator 2, reducing the heat loss of the entire soil organic matter thermal desorption device, and improving the heat utilization rate.

[0043] Specifically, in some embodiments, as shown in FIG. 1, the exhaust gas collecting mechanism 6 comprises a first collecting pipe 61 and a second collecting pipe 62. The inlet end and the outlet end of the first collecting pipe 61 are connected with the first exhaust gas outlet 14 and the exhaust gas collecting port 13, respectively. The inlet end and the outlet end of the second collecting pipe 62 are connected with the second exhaust gas outlet 33 and the exhaust gas collecting port 13, respectively. Figure 1

[0044] In this embodiment, the first collecting pipe 61 and the second collecting pipe 62 are used to return the exhaust heat gas of the low-temperature bin 1 and the high-temperature bin 3 to the low-temperature bin 1, so as to realize the recovery of the exhaust heat gas and reduce the heat loss.

[0045] In this embodiment, the exhaust heat gas of the high-temperature bin 3 is discharged from the second collecting pipe 62, and the air pressure in the high-temperature bin 3 can be kept balanced. The first collecting pipe 61 is divided into two pipe bodies, which are connected through a channel switching valve and a tail gas pipe. When the air pressure in the low-temperature bin 1 is too high, the channel switching valve is operated to discharge the exhaust heat gas of the low-temperature bin 1 to the outside or a tail gas treatment center through the tail gas pipe, so as to reduce the air pressure in the low-temperature bin 1.

[0046] In other embodiments, as shown in FIG. 2, the exhaust gas collecting mechanism 6 further comprises a first connecting pipe 63, a second connecting pipe 64, a tail gas discharge pipe 65 and a three-way valve 66. The first collecting pipe 61 and the second collecting pipe 62 are connected with the first connecting pipe 63. The first connecting pipe 63 is connected with the second connecting pipe 64 and the tail gas discharge pipe 65 through the three-way valve 66. The outlet end of the second connecting pipe 64 is connected to the exhaust gas collecting port 13. Figure 1

[0047] Specifically, as shown in FIG. 2, the inlet end of the first collecting pipe 61 is connected with the first exhaust gas outlet 14. The inlet end of the second collecting pipe 62 is connected with the second exhaust gas outlet 33. The outlet ends of the first collecting pipe 61 and the second collecting pipe 62 are connected with the first connecting pipe 63 through a three-way connecting piece, so as to make the exhaust heat gas of the low-temperature bin 1 and the high-temperature bin 3 converge to the first connecting pipe 63. The first connecting pipe 63, the second connecting pipe 64 and the tail gas discharge pipe 65 are connected through the three-way valve 66. The second connecting pipe 64 is connected to the exhaust gas collecting port 13. Figure 1

[0048] Therefore, the user can control the working state of the three-way valve 66 according to the actual heat demand and air pressure balance demand, so as to make a part of the exhaust heat gas discharged from the second connecting pipe 64 into the low-temperature bin 1, and another part of the exhaust heat gas discharged from the tail gas discharge pipe 65 into the tail gas treatment device 68, which is treated by the tail gas treatment device 68 and then discharged to the outside, so as to maintain the air pressure balance of the whole soil organic matter thermal desorption device and ensure the orderly desorption of the soil.

[0049] Figure 1 ​​​​As shown, both the first collection pipe 61 and the second collection pipe 62 are equipped with pressurizing fans 67. The pressurizing fans 67 overcome the resistance of the low-temperature chamber 1, the first collection pipe 61 and the second collection pipe 62, ensuring that the waste heat generated by the low-temperature chamber 1 and the high-temperature chamber 3 can be smoothly discharged into the low-temperature chamber 1.

[0050] Optionally, the pressurizing fan 67 can be a centrifugal fan, axial fan, root-type fan, or screw fan.

[0051] In some embodiments, the three-way valve 66 is a distribution-type three-way regulating valve. A thermal insulator and a pressure sensor are installed inside the cryogenic chamber 1. The pressure sensor is installed inside the thermal insulator. The pressure sensor is used to detect the pressure inside the cryogenic chamber 1. The pressure sensor and the distribution-type three-way regulating valve are communicatively connected.

[0052] Understandably, the waste heat from both cryogenic chamber 1 and high-temperature chamber 3 is discharged into cryogenic chamber 1, which may cause the pressure inside cryogenic chamber 1 to gradually increase. A pressure sensor is installed inside cryogenic chamber 1 to detect the pressure inside. High-temperature steam is isolated by a thermal insulation component to ensure the normal operation of the pressure sensor. Optionally, the thermal insulation component can be a rock wool thermal insulation component or a ceramic fiber thermal insulation component.

[0053] The pressure sensor is communicatively connected to the controller of the entire device, and the controller is communicatively connected to the distribution-type three-way regulating valve. When the pressure sensor detects that the air pressure in the cryogenic chamber 1 is too high, the controller controls the valve in the distribution-type three-way regulating valve connected to the exhaust pipe 65 to increase the opening, and at the same time controls the valve in the distribution-type three-way regulating valve connected to the second connecting pipe 64 to decrease the opening, so as to increase the discharge of waste heat gas and reduce the recovery of waste heat gas, thereby maintaining the air pressure balance in the cryogenic chamber 1.

[0054] like Figure 1 As shown, the cryogenic chamber 1 is equipped with a first pushing mechanism 7. The pushing device includes a driving component 71, a rotating shaft 72, and a spiral plate 73. The rotating shaft 72 is inserted into the cryogenic chamber 1. The spiral plate 73 is located inside the cryogenic chamber 1 and fixed to the rotating shaft 72. The spiral plate 73 extends along the axial direction of the rotating shaft 72 according to a preset length. The driving end of the driving component 71 is connected to the rotating shaft 72, and the spiral plate 73 pushes the soil to the discharge port 12 of the cryogenic chamber 1 under the drive of the rotating shaft 72.

[0055] Pushed by the first pushing device, the soil is transported from the head of the cryogenic chamber 1 to the tail of the cryogenic chamber 1, completing the initial desorption of the soil in the process. The user can reasonably design the preset length of the spiral plate 73 according to factors such as the thermal desorption time of volatile organic compounds. Optionally, the driving component 71 is a stepper motor or a servo motor. The rotating shaft 72 extends along the axial direction of the cryogenic chamber 1. The driving end of the driving component 71 drives the rotating shaft 72 to rotate, and the spiral plate 73 stirs the soil under the drive of the rotating shaft 72. During the spiral motion of the soil along the spiral direction of the spiral plate 73, it comes into full contact with the high-temperature steam to complete the volatilization and desorption of volatile organic compounds, and under the conveying of the spiral plate 73, the soil is transported to the discharge port 12 of the cryogenic chamber 1.

[0056] The high-temperature chamber 3 is equipped with a second pushing mechanism 8. The specific structure of the second pushing mechanism 8 is the same as that of the first pushing mechanism 7, and will not be described further here. Figure 1 As shown, the high-temperature chamber 3 is equipped with a discharge port 34 at its tail. Soil that has completed the entire thermal desorption process is discharged from the discharge port 34, thus completing soil remediation.

[0057] In some embodiments, such as Figure 1 As shown, the conveying mechanism 5 includes a conveyor belt 51 and an insulation cylinder 52. The two ends of the insulation cylinder 52 are connected to the low-temperature chamber 1 and the high-temperature chamber 3, respectively. The conveyor belt 51 is installed inside the insulation cylinder 52.

[0058] Specifically, after the soil desorbs volatile organic compounds in the low-temperature chamber 1, it is discharged from its outlet 12. A conveyor belt 51 is positioned between the outlet 12 of the low-temperature chamber 1 and the inlet 31 of the high-temperature chamber 3, transporting the soil desorbed from volatile organic compounds to the high-temperature chamber 3 for the desorption of semi-volatile organic compounds. An insulation cylinder 52 can be constructed between the low-temperature chamber 1 and the high-temperature chamber 3. One end of the insulation cylinder 52 is positioned at the outlet 12 of the low-temperature chamber 1, and the other end is positioned at the inlet 31 of the high-temperature chamber 3. The conveyor belt 51 is installed inside the insulation cylinder 52. On the one hand, the insulation cylinder 52 prevents high-temperature gas from leaking out of the conveying mechanism 5, ensuring the airtightness of the entire soil organic matter thermal desorption device. On the other hand, it effectively insulates the soil during transport, reducing heat loss and ensuring that the initial temperature of the soil entering the high-temperature chamber 3 is close to the temperature at which it exits from the outlet 12. This reduces the heating time of the soil in the high-temperature chamber 3, lowers the energy consumption of the second heat generator 4, and saves energy.

[0059] Optionally, the insulation cylinder 52 can be any one of rock wool insulation cylinder, ceramic fiber insulation cylinder, aluminum silicate insulation cylinder or glass wool insulation cylinder.

[0060] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A soil organic matter thermal desorption apparatus, characterized by, The application relates to a soil desorption and volatilization device. The low-temperature bin is provided with a first air inlet, the high-temperature gas outlet of the first heat generator is connected with the first air inlet, so that the soil in the low-temperature bin is desorbed and volatilized; the conveying mechanism is installed between the discharge port of the low-temperature bin and the feeding port of the high-temperature bin, and the soil is conveyed from the low-temperature bin to the high-temperature bin; the high-temperature bin is provided with a second air inlet, the high-temperature gas outlet of the second heat generator is connected with the second air inlet, so that the soil in the high-temperature bin is desorbed and semi-volatilized. The first heat generator is a steam heat generator or a solar heat generator; and / or 2. The soil organic matter thermal desorption apparatus according to claim 1, characterized by, The second heat generator is an electric heater or a gas heat generator. The device further comprises a waste gas collecting mechanism, the low-temperature bin is provided with a waste gas collecting port and a first waste gas discharge port, the high-temperature bin is provided with a second waste gas discharge port, and the first waste gas discharge port and the second waste gas discharge port are respectively communicated with the waste gas collecting port through the waste gas collecting mechanism.

3. The soil organic matter thermal desorption apparatus of claim 1, wherein, The waste gas collecting mechanism comprises a first collecting pipe and a second collecting pipe, the inlet end and the outlet end of the first collecting pipe are connected with the first waste gas discharge port and the waste gas collecting port respectively, and the inlet end and the outlet end of the second collecting pipe are connected with the second waste gas discharge port and the waste gas collecting port respectively.

4. The soil organic matter thermal desorption apparatus according to claim 3, characterized by, The waste gas collecting mechanism further comprises a first connecting pipe, a second connecting pipe, a tail gas discharge pipe and a three-way valve, the first collecting pipe and the second collecting pipe are connected with the first connecting pipe, the first connecting pipe is connected with the second connecting pipe and the tail gas discharge pipe through the three-way valve, and the outlet end of the second connecting pipe is connected to the waste gas collecting port.

5. The soil organic matter thermal desorption apparatus of claim 4, wherein, The first collecting pipe and the second collecting pipe are both provided with a pressurized fan.

6. The soil organic matter thermal desorption apparatus according to claim 4 or 5, characterized by, The three-way valve is a distribution type three-way regulating valve, the low-temperature bin is provided with a heat insulation member and an air pressure sensor, the air pressure sensor is installed in the interior of the heat insulation member, the air pressure sensor is used for detecting the air pressure in the low-temperature bin, and the air pressure sensor and the distribution type three-way regulating valve are communicatively connected.

7. The soil organic matter thermal desorption apparatus of claim 5, wherein, The low-temperature bin is provided with a first pushing mechanism, the first pushing mechanism comprises a driving member, a rotating shaft and a spiral plate, the rotating shaft is inserted into the low-temperature bin, the spiral plate is located in the low-temperature bin and is fixed to the rotating shaft, the spiral plate extends along the axial direction of the rotating shaft according to a preset length, the driving end of the driving member is connected with the rotating shaft, and the spiral plate is pushed to the discharge port of the low-temperature bin under the driving of the rotating shaft.

8. The soil organic matter thermal desorption apparatus of claim 1, wherein, The high-temperature bin is provided with a second pushing mechanism, and the specific structure of the second pushing mechanism is the same as that of the first pushing mechanism. The conveying mechanism comprises a conveying belt and a heat preservation cylinder, the two ends of the heat preservation cylinder are connected with the low-temperature bin and the high-temperature bin respectively, and the conveying belt is installed in the interior of the heat preservation cylinder.

9. The soil organic matter thermal desorption apparatus of claim 1, wherein, The heat preservation cylinder is any one of a rock wool heat preservation cylinder, a ceramic fiber heat preservation cylinder, an aluminum silicate heat preservation cylinder or a glass wool heat preservation cylinder.

10. The soil organic matter thermal desorption apparatus of claim 9, wherein, ​

Images