Waste heat recycling system for soil thermal remediation

Abstract

The invention provides a waste heat recycling system for soil thermal remediation, and belongs to the technical field of soil thermal remediation. The waste heat recycling system for soil thermal remediation comprises a heat exchanger and a spraying tower, and the spraying tower is connected with an exhaust port in the tail of a rotary kiln; the heat exchanger is connected between a gas outlet of the spray tower and the front end of the rotary kiln; a spraying liquid circulating assembly and a filtering device are arranged outside the spraying tower, the spraying liquid circulating assembly is used for supplying liquid to the spraying tower and recycling the sprayed liquid, and the filtering device is connected to a recycling pipeline of the spraying liquid circulating assembly and used for filtering and dedusting the sprayed liquid. The spray tower is connected with the exhaust port in the tail of the rotary kiln, dust-containing high-temperature tail gas exhausted by the rotary kiln can be sprayed, dust in the tail gas is removed, blockage or abrasion caused by the fact that the dust enters the heat exchanger is avoided, the service life of the heat exchanger is prolonged, and the maintenance cost of the heat exchanger is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil thermal remediation, and more specifically, relates to a waste heat recovery and utilization system for soil thermal remediation. Background Art

[0002] With the rapid development of industrialization, agricultural modernization, and the changes in people's lifestyles, a large amount of waste gas, wastewater, and solid waste have been generated. The unreasonable discharge and disposal of these pollutants have led to an increasingly prominent problem of soil pollution.

[0003] Soil thermal remediation is a process of heating the organic pollutant components in the soil to a high enough temperature to evaporate them and separate them from the soil medium. Rotary kiln thermal remediation is a high-temperature pyrolysis technology. By heating the contaminated soil in the rotary kiln to a specific temperature (usually 200 - 600 °C), the pollutants undergo physical volatilization, chemical decomposition, or immobilization, thereby achieving the purpose of soil remediation.

[0004] Currently, in the existing technology, waste heat recovery and utilization of the tail gas of the rotary kiln is carried out. That is, the high-temperature tail gas discharged from the rotary kiln transfers heat back to the rotary kiln through a heat exchanger for reuse, which can improve energy efficiency and reduce energy consumption.

[0005] However, since the high-temperature tail gas contains dust, directly entering the heat exchanger with the dust-containing high-temperature tail gas may cause blockage or wear, reduce the service life of the heat exchanger, and increase the maintenance cost of the heat exchanger. Summary of the Invention

[0006] The purpose of the present invention is to provide a waste heat recovery and utilization system for soil thermal remediation, so as to solve the technical problem in the existing technology that directly entering the heat exchanger with the dust-containing high-temperature tail gas may cause blockage or wear, reduce the service life of the heat exchanger, and increase the maintenance cost of the heat exchanger.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: to provide a waste heat recovery and utilization system for soil thermal remediation, including a heat exchanger and a spray tower. The spray tower is connected to the exhaust port at the tail of the rotary kiln, and the heat exchanger is connected between the outlet of the spray tower and the front end of the rotary kiln. A spray liquid circulation component and a filtering device are arranged outside the spray tower. The spray liquid circulation component is used to supply liquid to the spray tower and recover the sprayed liquid. The filtering device is connected to the recovery pipeline of the spray liquid circulation component, and the filtering device is used to filter and remove dust from the sprayed liquid.

[0008] Combined with the above technical solution, in a possible implementation, the spray liquid circulation assembly includes a storage tank, an outflow pipeline, and a return pipeline. The storage tank is arranged on one side of the spray tower and is used for storing the spray liquid. The outflow pipeline is connected between the storage tank and the spray pipe at the top of the spray tower. The return pipeline is connected between the storage tank and the liquid outlet at the bottom of the spray tower. The filtering device is arranged on the return pipeline.

[0009] Combined with the above technical solution, in a possible implementation, the filtering device includes an installation cylinder, a rotating filter cylinder, a driving member, and a connecting mechanism. The installation cylinder is arranged below the spray tower. The rotating filter cylinder is coaxially and rotatably connected inside the installation cylinder, and the peripheral surface of the rotating filter cylinder is made of a filtering material that only allows liquid to pass through. The top of the rotating filter cylinder is connected to the liquid outlet at the bottom of the spray tower through the return pipeline. The bottom of the installation cylinder is connected to the storage tank through the return pipeline. The driving member is arranged below the installation cylinder and is used to drive the rotating filter cylinder to rotate. The connecting mechanism is arranged between the installation cylinder and the rotating filter cylinder and allows the two to be detachably connected.

[0010] Combined with the above technical solution, in a possible implementation, the rotating filter cylinder is composed of a cylindrical frame and a filtering layer. The filtering layer is laid on the inner side of the cylindrical frame.

[0011] Combined with the above technical solution, in a possible implementation, the connecting mechanism includes a closing cover, a rotating pipe, and a connecting member. The closing cover is buckled on the top of the installation cylinder and is divided into two halves in the middle. The rotating pipe is coaxially and rotatably connected to the top of the rotating filter cylinder. The rotating pipe is clamped between the two halves of the closing cover. The closing cover and the installation cylinder are detachably connected. The connecting member is connected between the bottom of the rotating pipe and the return pipeline. The return pipeline between the rotating pipe and the spray tower is a telescopic structure.

[0012] Combined with the above technical solution, in a possible implementation, the connecting mechanism further includes a connecting column, an installation column, a rotating column, and a pressing assembly. The connecting column is coaxially fixed below the rotating filter cylinder and is rectangular. The installation column is coaxially fixed at the inner bottom of the installation cylinder. The rotating column is coaxially and rotatably embedded in the installation column. A rectangular groove for inserting the connecting column is formed on the top surface of the rotating column. Pressing grooves are formed around the connecting column. The pressing assembly is arranged in the rotating column and is used to apply downward pressure to the bottom wall of the pressing grooves.

[0013] Combined with the above technical solution, in a possible implementation manner, the extrusion assembly includes an extrusion column, a transmission column, a lever, and a reset member. A receiving groove for the corresponding extrusion column to slide therein is provided around the rotating column. The bottom end of one end of the extrusion column facing the corresponding extrusion groove and the opening of the inner bottom wall of the extrusion groove are extrusion inclined surfaces that are adapted to each other. A rotating groove communicating with the bottom of the rectangular groove is provided in the rotating column. The lever is rotatably arranged in the corresponding rotating groove. A transmission groove is opened between the rotating groove and the corresponding receiving groove. The transmission column is slidably arranged in the transmission groove. An inclined groove for the end of the transmission column to be inserted into is provided at the bottom of the extrusion column. The side wall of the inclined groove facing the connecting column and one side of the end of the transmission column are extrusion inclined surfaces that are adapted to each other. One end of the lever contacts the bottom end of the transmission column, and the other end is for the extrusion column to press down. The reset member is used to drive the extrusion column to disengage from the extrusion groove.

[0014] Combined with the above technical solution, in a possible implementation manner, the reset member is an annular electromagnet. The reset member is embedded in the inner wall of the rectangular groove. The extrusion column is made of ferromagnetic material and is attracted and tightened by the energized reset member. At this time, the extrusion column is completely located in the receiving groove.

[0015] Combined with the above technical solution, in a possible implementation manner, magnetic blocks that attract each other are embedded at the positions where the bottom end of the connecting column contacts the lever.

[0016] Combined with the above technical solution, in a possible implementation manner, a heat exchange pipe fitting is spirally wound around the outside of the installation cylinder.

[0017] The beneficial effects of a waste heat recovery and utilization system for soil thermal remediation provided by the present invention are as follows: Compared with the prior art, by connecting the spray tower to the exhaust port at the tail of the rotary kiln, the present invention can perform spray treatment on the dust-containing high-temperature tail gas discharged from the rotary kiln to remove the dust in the tail gas and prevent the dust from entering the heat exchanger and causing blockage or wear. The heat exchanger is connected between the air outlet of the spray tower and the front end of the rotary kiln to realize the recovery and utilization of the waste heat of the tail gas after spraying, improve the energy efficiency, and reduce the energy consumption. A spray liquid circulation assembly and a filtering device are arranged outside the spray tower. The spray liquid circulation assembly realizes the recycling of the spray liquid, saves resources, and the filtering device filters and removes dust from the liquid after spraying to ensure the cleanliness of the spray liquid, enables the spray tower to operate continuously and stably, and finally extends the service life of the heat exchanger and reduces the maintenance cost of the heat exchanger. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a system block diagram of a waste heat recovery and utilization system for soil thermal remediation provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a spray tower, a spray liquid circulation assembly, and a filtering device provided by an embodiment of the present invention Figure 2 ; Figure 3 It is a partial cross-sectional view of the spray liquid circulation assembly and the filtering device provided by an embodiment of the present invention; Figure 4 It is a partial cross-sectional view of a connection mechanism and an extrusion assembly provided by an embodiment of the present invention.

[0020] Among them, the reference numerals in the drawings are as follows: 1. Spray tower; 2. Spray liquid circulation assembly; 21. Storage tank; 22. Outflow pipeline; 23. Return pipeline; 3. Filtering device; 31. Installation cylinder; 32. Rotating filter cylinder; 33. Driving member; 34. Connection mechanism; 341. Sealing cover; 342. Rotating pipe; 343. Connecting piece; 344. Connecting column; 3441. Extrusion groove; 345. Installation column; 346. Rotating column; 3461. Rectangular groove; 3462. Accommodating groove; 3463. Rotating groove; 3464. Transmission groove; 35. Extrusion assembly; 351. Extrusion column; 3511. Inclined groove; 352. Transmission column; 353. Lever; 354. Reset member; 4. Magnet; 5. Heat exchange pipe fitting. Specific embodiments

[0021] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention clearer and more understandable, the following further details the present invention in conjunction with the drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0022] It should be further noted that the drawings and embodiments of the present invention mainly describe and illustrate the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems, control systems, etc. may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above specific forms and settings in a well-known manner.

[0023] When an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] The orientation terms "inside" and "outside" refer to the inside and outside of the contour of each component itself. The terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0025] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, and corresponding interpretations should be made for the spatial relative descriptions used here.

[0026] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, and the meaning of "several" is one or more, unless otherwise specifically defined.

[0027] A waste heat recovery and utilization system for soil thermal remediation provided by the present invention will now be described.

[0028] As Figure 1 and Figure 2 shown, an embodiment of the present invention provides a waste heat recovery and utilization system for soil thermal remediation, including a heat exchanger and a spray tower 1. The spray tower 1 is connected to the exhaust port at the tail of the rotary kiln, and the heat exchanger is connected between the outlet of the spray tower 1 and the front end of the rotary kiln; a spray liquid circulation component 2 and a filtering device 3 are arranged outside the spray tower 1. The spray liquid circulation component 2 is used to supply liquid to the spray tower 1 and recover the sprayed liquid, and the filtering device 3 is connected to the recovery pipeline of the spray liquid circulation component 2. The filtering device 3 is used to filter and remove dust from the sprayed liquid.

[0029] The waste heat recovery and utilization system for soil thermal remediation provided in this embodiment, compared with the prior art, by connecting the spray tower 1 to the exhaust port at the tail of the rotary kiln, the dusty high-temperature tail gas discharged from the rotary kiln can be spray-treated to remove the dust in the tail gas, avoiding the blockage or abrasion of the heat exchanger caused by the dust entering; the heat exchanger is connected between the outlet of the spray tower 1 and the front end of the rotary kiln, realizing the recovery and utilization of the waste heat of the tail gas after spraying, improving the energy efficiency and reducing the energy consumption; a spray liquid circulation component 2 and a filtering device 3 are arranged outside the spray tower 1. The spray liquid circulation component 2 realizes the recycling of the spray liquid, saving resources. The filtering device 3 filters and removes dust from the sprayed liquid, ensuring the cleanliness of the spray liquid, enabling the spray tower 1 to operate continuously and stably, ultimately extending the service life of the heat exchanger and reducing the maintenance cost of the heat exchanger.

[0030] As Figures 2 to 3 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: The spray liquid circulation component 2 includes a storage tank 21, an outflow pipeline 22 and a return pipeline 23. The storage tank 21 is arranged on one side of the spray tower 1 and is used to store the spray liquid. The outflow pipeline 22 is connected between the storage tank 21 and the spray pipe at the top of the spray tower 1. The return pipeline 23 is connected between the storage tank 21 and the liquid outlet at the bottom of the spray tower 1; the filtering device 3 is arranged on the return pipeline 23.

[0031] The storage tank 21 is used to store the spray liquid. The outflow pipeline 22 transports the spray liquid in the storage tank 21 to the spray pipe at the top of the spray tower 1 to realize the spraying of the tail gas. The return pipeline 23 recovers the liquid at the liquid outlet at the bottom of the spray tower 1 to the storage tank 21 to form a cycle. The structure is simple and easy to implement; the filtering device 3 is arranged on the return pipeline 23, which can filter the returned spray liquid in time, ensuring the cleanliness of the spray liquid during the circulation process and ensuring the stable spraying effect of the spray tower 1.

[0032] As Figures 2 to 3As shown in the figure, a specific implementation manner provided by the present invention on the basis of the above-mentioned implementation manner is as follows: The filtering device 3 includes a mounting cylinder 31, a rotary filtering cylinder 32, a driving member 33 and a connecting mechanism 34. The mounting cylinder 31 is arranged below the spray tower 1. The rotary filtering cylinder 32 is coaxially and rotatably connected inside the mounting cylinder 31, and the circumferential surface of the rotary filtering cylinder 32 is made of a filtering material that only allows liquid to pass through. The top of the rotary filtering cylinder 32 is connected to the liquid outlet at the bottom of the spray tower 1 through a return pipeline 23, and the bottom of the mounting cylinder 31 is connected to the storage tank 21 through the return pipeline 23. The driving member 33 is arranged below the mounting cylinder 31 and is used to drive the rotary filtering cylinder 32 to rotate. The connecting mechanism 34 is arranged between the mounting cylinder 31 and the rotary filtering cylinder 32 and is used for detachably connecting the two.

[0033] The spray liquid flowing out from the liquid outlet at the bottom of the spray tower 1 directly enters the rotary filtering cylinder 32 through the return pipeline 23. The spray liquid can directly pass through the circumferential surface of the rotary filtering cylinder 32 and be filtered into the mounting cylinder 31. Then, the driving member 33 drives the rotary filtering cylinder 32 to rotate, which can further improve the separation efficiency of the spray liquid and the dust by centrifugal force. And after long-term use, the rotary filtering cylinder 32 can be detached through the connecting mechanism 34 for dust cleaning.

[0034] As Figures 2 to 3 shown in the figure, a specific implementation manner provided by the present invention on the basis of the above-mentioned implementation manner is as follows: The rotary filtering cylinder 32 is composed of a cylindrical frame and a filtering layer, and the filtering layer is laid on the inner side of the cylindrical frame. Laying the filtering layer on the inner side of the cylindrical frame has a reasonable structural design. The cylindrical frame provides support, and the filtering layer realizes the filtering function.

[0035] Specifically, in this embodiment, the filtering layer can be made of a high-temperature resistant cloth bag or a composite fiber material, which can not only realize the isolation and filtration of the spray liquid and the dust, but also be resistant to high temperature and extend the service life.

[0036] As Figures 2 to 3 shown in the figure, a specific implementation manner provided by the present invention on the basis of the above-mentioned implementation manner is as follows: The connecting mechanism 34 includes a closing cover 341, a rotary pipe 342 and a connecting member 343. The closing cover 341 is buckled on the top of the mounting cylinder 31 and is divided into two halves in the middle. The rotary pipe 342 is coaxially and rotatably connected to the top of the rotary filtering cylinder 32. The rotary pipe 342 is clamped between the two halves of the closing cover 341, and the closing cover 341 is detachably connected to the mounting cylinder 31. The connecting member 343 is connected between the bottom of the rotary pipe 342 and the return pipeline 23, and the return pipeline 23 between the rotary pipe 342 and the spray tower 1 is a telescopic structure.

[0037] Specifically, in this embodiment, the connecting member 343 is a combination of a flange and bolts and nuts.

[0038] The two semi-closed covers 341 can effectively fix the rotating tube 342. The setting of the rotating tube 342 can ensure the smooth rotation of the rotating filter cartridge 32. The closed cover 341 is detachably connected to the mounting cylinder 31, which is convenient for the maintenance and repair of the upper part of the rotating filter cartridge 32. The retractable return pipeline 23 can provide space for the removal of the rotating filter cartridge 32.

[0039] As Figures 3 to 4 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: The connecting mechanism 34 further includes a connecting column 344, a mounting column 345, a rotating column 346 and a pressing assembly 35. The connecting column 344 is coaxially fixed below the rotating filter cartridge 32 and is rectangular. The mounting column 345 is coaxially fixed at the inner bottom of the mounting cylinder 31. The rotating column 346 is coaxially rotatably embedded in the mounting column 345. A rectangular groove 3461 for inserting the connecting column 344 is formed on the top surface of the rotating column 346. Pressing grooves 3441 are formed around the connecting column 344. The pressing assembly 35 is arranged in the rotating column 346 and is used to apply downward pressure to the inner bottom wall of the pressing groove 3441.

[0040] Specifically, in this embodiment, the driving member 33 is a motor, and the output shaft of the driving member 33 is coaxially fixed to the rotating column 346.

[0041] The cooperation between the connecting column 344 and the rectangular groove 3461 can realize the preliminary connection between the rotating filter cartridge 32 and the rotating column 346. Then, by applying downward pressure to the inner bottom wall of the pressing groove 3441 through the pressing assembly 35, the connection between the rotating filter cartridge 32 and the mounting cylinder 31 can be further stabilized when the rotating filter cartridge 32 rotates, preventing shaking and ensuring the stability of the filtering process.

[0042] As Figure 4 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: The extrusion assembly 35 includes an extrusion column 351, a transmission column 352, a lever 353 and a reset member 354. A receiving groove 3462 for the corresponding extrusion column 351 to slide therein is provided around the rotating column 346. The bottom end of one end of the extrusion column 351 facing the corresponding extrusion groove 3441 and the opening of the inner bottom wall of the extrusion groove 3441 are extrusion inclined surfaces that are adapted to each other. A rotating groove 3463 communicating with the bottom of the rectangular groove 3461 is provided in the rotating column 346. The lever 353 is rotatably arranged in the corresponding rotating groove 3463. A transmission groove 3464 is opened between the rotating groove 3463 and the corresponding receiving groove 3462. The transmission column 352 is slidably arranged in the transmission groove 3464. An inclined groove 3511 for the end of the transmission column 352 to be inserted therein is provided at the bottom of the extrusion column 351. The side wall of the inclined groove 3511 facing the connecting column 344 and one side of the end of the transmission column 352 are extrusion inclined surfaces that are adapted to each other. One end of the lever 353 contacts the bottom end of the transmission column 352, and the other end is for the extrusion column 351 to be pressed down. The reset member 354 is used to drive the extrusion column 351 to disengage from the extrusion groove 3441. When the extrusion column 351 is in the initial state of disengaging from the extrusion groove 3441, the end of the lever 353 away from the transmission column 352 is located in the rectangular groove 3461.

[0043] When installing the rotating filter cartridge 32, the connecting column 344 is inserted into the rectangular groove 3461 and presses down on the plurality of levers 353 simultaneously. The other end of the lever 353 pushes the transmission column 352 upward to squeeze it into the inclined groove 3511, so that one end of the extrusion column 351 is inserted into the extrusion groove 3441. At the same time, the inclined surface of the extrusion column 351 gradually presses down on the inclined surface of the extrusion groove 3441, realizing that the connecting column 344 automatically receives a pressing effect after being inserted into the rectangular groove 3461, without adding additional operation steps, and improving the installation convenience of the rotating filter cartridge 32.

[0044] When disassembling the rotating filter cartridge 32, the reset member 354 drives each extrusion column 351 to disengage from the extrusion groove 3441, and then the rotating filter cartridge 32 can be directly lifted upward to disengage the connecting column 344 from the rectangular groove 3461.

[0045] As Figure 4 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: The reset member 354 is an annular electromagnet. The reset member 354 is embedded in the inner wall of the rectangular groove 3461. The extrusion column 351 is made of ferromagnetic material and is attracted and tightened by the energized reset member 354. At this time, the extrusion column 351 is completely located in the receiving groove 3462.

[0046] When installing the rotating filter cylinder 32, the reset member 354 is not energized and does not generate suction. After the extrusion column 351 is extruded by the transmission column 352, it moves. When disassembling the rotating filter cylinder 32, the reset member 354 is energized and attracts the extrusion column 351 to its initial state. At the same time, the rotating filter cylinder 32 is lifted upward. The movement of the extrusion column 351 drives the transmission column 352 and the lever 353 to reset, facilitating the installation of the rotating filter cylinder 32 next time, and ultimately improving the convenience of disassembling and assembling the rotating filter cylinder 32.

[0047] As Figure 4 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: Magnets 4 that attract each other are embedded at the positions where the bottom ends of the connecting columns 344 are in contact with the lever 353.

[0048] When disassembling the rotating filter cylinder 32, the reset member 354 is energized and the rotating filter cylinder 32 is lifted upward. At this time, the mutual attraction between the magnets 4 on the connecting column 344 and the lever 353 can assist the lever 353 to rotate and reset, so that the magnets 4 can cooperate with the reset member 354 to apply reset forces simultaneously at both ends of the transmission structure in the extrusion assembly 35, improving the operating stability of the extrusion assembly 35; and when the rotating filter cylinder 32 is in the installed state, the two magnets 4 can improve the firmness between the connecting column 344 and the lever 353, and thus improve the rotational stability of the rotating filter cylinder 32.

[0049] As Figure 2 shown, a specific embodiment provided by the present invention on the basis of the above embodiment is as follows: A heat exchange pipe fitting 5 is spirally wound around the outside of the installation cylinder 31.

[0050] Specifically, cold air or cold liquid is introduced into the heat exchange pipe fitting 5, which can not only cool the filtered spray liquid, reducing the possibility of evaporation of the spray liquid; but also return the heat after heat transfer back to the rotary kiln operation site for reuse, reducing energy waste.

[0051] Furthermore, in this embodiment, the spray liquid uses a high-temperature-resistant oil-based spray liquid, which can not only adsorb dust in the high-temperature tail gas, but also reduce the evaporation of the spray liquid caused by high temperature, improving the stability of spray dust removal.

[0052] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0053] It should be noted that the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A waste heat recovery system for soil thermal remediation, characterized in that: The invention comprises a heat exchanger and a spray tower (1), wherein the spray tower (1) is connected to the exhaust port at the rear of a rotary kiln, and the heat exchanger is connected between the exhaust port of the spray tower (1) and the front end of the rotary kiln; a spray liquid circulation component (2) and a filter device (3) are arranged outside the spray tower (1), wherein the spray liquid circulation component (2) is used to supply liquid to the spray tower (1) and to recover the liquid after spraying, and the filter device (3) is connected to the recovery pipeline of the spray liquid circulation component (2), and the filter device (3) is used to filter and remove dust from the liquid after spraying.

2. A waste heat recovery system for soil thermal remediation as claimed in claim 1, characterized in that: The spray liquid circulation assembly (2) comprises a storage box (21), an outflow pipeline (22) and a return pipeline (23); the storage box (21) is arranged on one side of the spray tower (1) and is used to store the spray liquid; the outflow pipeline (22) is connected between the storage box (21) and the spray pipe at the top of the spray tower (1); the return pipeline (23) is connected between the storage box (21) and the liquid outlet at the bottom of the spray tower (1); and the filtering device (3) is arranged on the return pipeline (23).

3. A waste heat recovery system for soil thermal remediation as claimed in claim 2, characterized in that: The filtering device (3) comprises a mounting cylinder (31), a rotating filter cylinder (32), a driving member (33) and a connecting mechanism (34); the mounting cylinder (31) is arranged below the spray tower (1); the rotating filter cylinder (32) is coaxially rotatably connected in the mounting cylinder (31); and the peripheral surface of the rotating filter cylinder (32) is a filtering material that only allows liquid to pass through; the top of the rotating filter cylinder (32) is connected to the liquid outlet at the bottom of the spray tower (1) via the return pipeline (23); the bottom of the mounting cylinder (31) is connected to the storage box (21) via the return pipeline (23); the driving member (33) is arranged below the mounting cylinder (31) and is used to drive the rotating filter cylinder (32) to rotate; and the connecting mechanism (34) is arranged between the mounting cylinder (31) and the rotating filter cylinder (32) and allows the two to be detachably connected.

4. A waste heat recovery system for soil thermal remediation as claimed in claim 3, characterized in that: The rotary filter cartridge (32) consists of a cylindrical frame and a filter layer, and the filter layer is laid on the inner side of the cylindrical frame.

5. A waste heat recovery system for soil thermal remediation as claimed in claim 3, characterized in that: The connection mechanism (34) comprises a closing cover (341), a rotating tube (342) and a connecting piece (343); the closing cover (341) is buckled onto the top of the installation cylinder (31) and is divided into two halves by the middle; the rotating tube (342) is coaxially rotatably connected to the top of the rotating filter cylinder (32); the rotating tube (342) is sandwiched between the two halves of the closing cover (341); the closing cover (341) and the installation cylinder (31) are detachably connected; the connecting piece (343) is connected between the bottom of the rotating tube (342) and the return pipeline (23); the return pipeline (23) between the rotating tube (342) and the spray tower (1) is a retractable structure.

6. A waste heat recovery system for soil thermal remediation as claimed in claim 3 or 5, characterized in that: The connecting mechanism (34) further comprises a connecting column (344), a mounting column (345), a rotating column (346) and an extrusion assembly (35); the connecting column (344) is coaxially fixed below the rotating filter cylinder (32) and is rectangular in shape; the mounting column (345) is coaxially fixed to the bottom of the mounting cylinder (31); the rotating column (346) is coaxially rotatably embedded in the mounting column (345); a rectangular groove (3461) for inserting the connecting column (344) is provided on the top surface of the rotating column (346); extrusion grooves (3441) are provided around the connecting column (344); the extrusion assembly (35) is arranged in the rotating column (346) and is used to apply downward pressure to the bottom wall of the extrusion groove (3441).

7. A waste heat recovery system for soil thermal remediation as claimed in claim 6, characterized in that: The extrusion assembly (35) comprises an extrusion column (351), a transmission column (352), a lever (353) and a reset member (354); the rotating column (346) is provided with a receiving groove (3462) around which the corresponding extrusion column (351) slides; the bottom of one end of the extrusion column (351) facing the corresponding extrusion groove (3441) and the opening of the inner bottom wall of the extrusion groove (3441) are mutually adapted extrusion inclined surfaces; the rotating column (346) is provided with a rotation groove (3463) connected to the bottom of the rectangular groove (3461); the lever (353) is rotatably arranged in the corresponding rotation groove (3463); the rotation A transmission groove (3464) is provided between the groove (3463) and the corresponding receiving groove (3462); the transmission column (352) is slidably arranged in the transmission groove (3464); an inclined groove (3511) is provided at the bottom of the extrusion column (351) for the end of the transmission column (352) to be inserted; the side wall of the inclined groove (3511) facing the connecting column (344) and the end of the transmission column (352) are mutually adapted extrusion inclined surfaces; one end of the lever (353) contacts the bottom end of the transmission column (352), and the other end is used for the extrusion column (351) to press downward; the reset member (354) is used to drive the extrusion column (351) to leave the extrusion groove (3441).

8. A waste heat recovery system for soil thermal remediation as claimed in claim 7, characterized in that: The reset member (354) is a ring-shaped electromagnet, and the reset member (354) is embedded in the inner wall of the rectangular groove (3461). The extrusion column (351) is made of ferromagnetic material and is sucked tightly by the reset member (354) after power is supplied. At this time, the extrusion column (351) is completely located in the accommodating groove (3462).

9. A waste heat recovery system for soil thermal remediation as claimed in claim 7, characterized in that: Magnetic blocks (4) that attract each other are embedded at the positions where the bottom ends of the connecting columns (344) and the levers (353) contact each other.

10. The waste heat recovery system for soil thermal remediation according to claim 3, characterized in that: A heat exchange pipe (5) is spirally wound around the outer side of the installation cylinder (31).

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