A device and method for recycling fluorinated sludge based on multi-stage aerodynamic heat exchange

Abstract

This application provides a device and method for the recycling and resource recovery of fluorinated sludge based on multi-stage pneumatic heat exchange. The device includes: a heating structure, a first drying structure, and a second drying structure. One end of the heating structure is connected to an air supply structure, and the other end of the heating structure is connected to the air inlet of both the first and second drying structures. The second drying structure is connected to the first drying structure. The first drying structure has a first dispersing component for dispersing the fluorinated sludge, and the first drying structure is used to perform a primary drying of the dispersed fluorinated sludge. The second drying structure has a second dispersing component for secondary dispersing the fluorinated sludge, and the second drying structure is used to perform a secondary drying of the secondary-dispersed fluorinated sludge. The air outlets of both the first and second drying structures are connected to the heating structure, and the temperature inside the second drying structure is higher than the temperature inside the first drying structure. This application improves the drying efficiency of fluorinated sludge and enhances thermal energy utilization efficiency.

Description

Technical Field

[0001] This application relates to the field of fluorine-containing sludge treatment technology, and in particular to a device and method for the recycling and resource recovery of fluorine-containing sludge based on multi-stage pneumatic heat exchange. Background Technology

[0002] With the rapid development of the photovoltaic industry, a large amount of complex fluorinated sludge is generated during the cleaning and etching processes of photovoltaic glass and silicon wafers. This type of sludge is mainly composed of calcium fluoride (CaF2), silicon dioxide (SiO2), and small amounts of metal oxides and organic impurities. With the increasing demand for high-purity, high-performance fluorinated materials, fluorinated sludge is now widely used to replace natural fluorite as a raw material for fluorochemicals. Due to the high moisture content (35%-65%) of fluorinated sludge, it needs to be dried to remove moisture to below 0.1% before being used in hydrofluoric acid (HF) production.

[0003] Currently, fluorinated sludge is mainly dried using traditional drying processes (such as rotary kilns and drum dryers). Mechanical stirring devices (such as lifting plates and scrapers) disperse the wet fluorinated sludge and bring it into contact with hot air, utilizing heat conduction and convection to achieve moisture evaporation. However, in actual industrial production, the raw material fluorinated sludge has a large specific surface area and high viscosity, making it prone to agglomeration. On the one hand, direct high-temperature drying leads to a crust forming on the surface of the fluorinated sludge, hindering internal moisture evaporation; on the other hand, mechanical stirring is insufficient to completely break up the agglomerated fluorinated sludge, resulting in residual moisture in some areas. This makes it difficult for the internal moisture of the fluorinated sludge to evaporate completely, failing to meet the moisture content requirements for fluorinated sludge in hydrofluoric acid (HF) production. Summary of the Invention

[0004] This application provides a device and method for recycling fluorinated sludge based on multi-stage pneumatic heat exchange, which increases the contact time between fluorinated sludge and hot air, thereby improving the drying uniformity and drying efficiency of the fluorinated sludge.

[0005] To achieve the above-mentioned objectives, this application adopts the following approach:

[0006] In a first aspect, this application provides a device for the recycling and resource recovery of fluorinated sludge based on multi-stage pneumatic heat exchange, comprising:

[0007] A heating structure, wherein the air inlet end of the heating structure is connected to the air outlet end of the air supply structure;

[0008] The first drying structure has an air inlet connected to the air outlet of the heating structure. The first drying structure has a first dispersing component for dispersing fluoride-containing sludge. The first drying structure is used to dry the dispersed fluoride-containing sludge once.

[0009] The second drying structure has an air inlet connected to the air outlet of the heating structure and a feed inlet connected to the discharge outlet of the first drying structure. The second drying structure has a second dispersing component, which is used to further disperse the fluorine-containing sludge after it has been dried by the first drying structure. The second drying structure is used to further dry the fluorine-containing sludge after it has been dispersed.

[0010] The air outlets of both the first drying structure and the second drying structure are connected to the heating structure, and the temperature inside the second drying structure is higher than the temperature inside the first drying structure.

[0011] In one possible implementation, the heating structure includes:

[0012] A heat collector, wherein the air inlet of the heat collector is connected to the air outlet of the air supply structure via an air inlet pipe;

[0013] The first air outlet pipe has one end connected to the air outlet of the heat collector and the other end connected to the air inlet of the first drying structure.

[0014] The second air outlet pipe has one end connected to the air outlet of the heat collector and the other end connected to the air inlet of the second drying structure.

[0015] The first exhaust gas recirculation pipe has one end connected to the heat collector and the other end connected to the air outlet of the air supply structure.

[0016] The first air outlet pipe is equipped with a first heating element, and the second air outlet pipe is equipped with a second heating element.

[0017] The air outlets of the first drying structure and the second drying structure are respectively connected to the heat energy collector.

[0018] In one possible implementation, the first drying structure includes:

[0019] The first drying chamber has its air inlet connected to the first air outlet duct.

[0020] The feed inlet is located at the top of the first drying chamber;

[0021] The first dispersing component is disposed in the first drying chamber and is located below the feed inlet to disperse the fluoride-containing sludge entering the first drying chamber.

[0022] In one possible implementation, the first dispersing component includes:

[0023] An electric motor is located at one end of the first drying chamber;

[0024] A dispersing rotor is connected to the output end of the motor and is located below the feed inlet.

[0025] In one possible implementation, the first drying structure further includes:

[0026] A cyclone dust collector, wherein the feed end of the cyclone dust collector is connected to the outlet end of the first drying chamber through a first conveying pipe;

[0027] The first hopper is located at the discharge end of the cyclone dust collector;

[0028] The outlet of the cyclone dust collector is connected to the heat collector via a second exhaust gas recycling pipe, and the outlet of the first silo is connected to the inlet of the second drying structure via a material conveying pipe.

[0029] In one possible implementation, the second drying structure includes:

[0030] The second drying chamber has a first air inlet, a second air inlet and a third air inlet. The first air inlet is located at one end of the second drying chamber, the second air inlet is located at the other end of the second drying chamber, and the third air inlet is located below the first air inlet.

[0031] The first air inlet pipe is connected between the first air inlet and the second air outlet pipe;

[0032] The second air inlet pipe is connected between the second air inlet and the first air inlet pipe;

[0033] The third air inlet pipe is connected between the third air inlet and the first air inlet pipe;

[0034] The first air inlet pipe, the second air inlet pipe, and the third air inlet pipe are each equipped with a flow regulating valve. The flow rate of the first air inlet is greater than that of the second air inlet, and the flow rate of the second air inlet is greater than that of the third air inlet.

[0035] The second dispersing component is installed in the second drying chamber to disperse the fluoride-containing sludge entering the second drying chamber.

[0036] In one possible implementation, the second dispersing component includes:

[0037] At least one set of flow guiding groups, the at least one set of flow guiding groups including a plurality of flow guiding baffles spaced apart, the plurality of flow guiding baffles being arranged radially on the inner wall of the second drying chamber, and an included angle between two adjacent flow guiding baffles;

[0038] Multiple vibrators are evenly arranged on the circumferential inner wall of the second drying chamber.

[0039] In one possible implementation, the second drying structure further includes:

[0040] The second hopper is located in the second drying chamber on the side near the second air inlet;

[0041] A hot air heat exchanger, wherein the feed end of the hot air heat exchanger is connected to the outlet end of the second silo via a second conveying pipe;

[0042] The third hopper is located at the outlet end of the hot air heat exchanger;

[0043] The outlet of the hot air heat exchanger is connected to the heat energy collector via a third exhaust gas recycling pipe.

[0044] In one possible implementation, the air inlet of the hot air heat exchanger is connected to a fan, and the air inlet of the fan is connected to an inert air source.

[0045] Secondly, this application provides a method for the recycling and resource recovery of fluorinated sludge based on multi-stage pneumatic heat exchange, applied to the fluorinated sludge recycling and resource recovery device based on multi-stage pneumatic heat exchange described in any of the above claims, the method comprising:

[0046] Air is introduced into the heating structure, and the heating structure provides hot drying air into the first drying structure and the second drying structure.

[0047] The fluorine-containing sludge to be dried is added into the first drying structure, the first dispersing component disperses the fluorine-containing sludge once, and the first drying structure dries the dispersed fluorine-containing sludge once.

[0048] The fluorinated sludge that has been dried once is transported to the second drying structure. The second dispersing component disperses the fluorinated sludge that has been dried once, and the second drying structure dries the fluorinated sludge that has been dispersed twice.

[0049] The exhaust gas generated after primary and secondary drying is sent to the heating structure to heat the incoming air.

[0050] In one possible implementation, the heating structure provides hot drying air to the first drying structure and the second drying structure, including:

[0051] The air output from the air supply structure is preheated using a heat energy collector;

[0052] The first heating element heats the hot air conveyed into the first drying structure to 120-150°C;

[0053] The second heating element heats the hot air conveyed to the second drying structure to 160-200°C.

[0054] In one possible implementation, the step of adding the fluorinated sludge to be dried into the first drying structure, the first dispersing component dispersing the fluorinated sludge once, and the first drying structure drying the dispersed fluorinated sludge once includes:

[0055] The fluorinated sludge with high water content is fed into the first drying chamber through the feed inlet;

[0056] The motor-driven dispersing rotor rotates at high speed in the first drying chamber to fully disperse the fluoride-containing sludge.

[0057] The broken-up fluoride-containing sludge is brought into full contact with the hot air entering the first drying chamber to dry the fluoride-containing sludge once.

[0058] In one possible implementation, the conveying of the primary dried fluoride-containing sludge to the second drying structure includes:

[0059] The fluorinated sludge and high-temperature gas, after being dried once, are transported to the cyclone dust collector through the first conveying pipe.

[0060] A cyclone dust collector is used to separate fluorine-containing sludge and high-temperature gas, and the separated fluorine-containing sludge is transported to the second drying chamber through a material conveying pipe.

[0061] In one possible implementation, the second dispersing component further disperses the fluorinated sludge that has been dried once, and the second drying structure further dries the fluorinated sludge that has been dispersed twice, including:

[0062] The hot air heated by the second heating element is introduced into the second drying chamber through the first air inlet, the second air inlet and the third air inlet;

[0063] The air velocity at the first, second, and third air inlets is adjusted to 0.8-1.5 m / s using flow regulating valves, so that the flow rate at the second air inlet is 10-20% lower than that at the first air inlet, and the flow rate at the third air inlet is lower than that at the second air inlet.

[0064] Multiple baffles with angled angles collide with the fluorinated sludge carried by hot air to break up the fluorinated sludge, and an ultrasonic array composed of multiple vibrators is used to break the fluorinated sludge into single particles.

[0065] The fluorinated sludge, broken into individual particles, is brought into full contact with the hot air entering the second drying chamber to perform a secondary drying process.

[0066] In one possible implementation, the step of conveying the exhaust gas generated after primary and secondary drying to a heating structure to heat the incoming air includes:

[0067] The high-temperature gas separated by the cyclone dust collector is transported to the heat energy collector through the second tail gas recycling pipe.

[0068] The fluorine-containing sludge after secondary drying and high-temperature gas are transported to the hot air heat exchanger through the second conveying pipe.

[0069] Low-temperature inert gas is introduced into the hot air heat exchanger to cool the fluorine-containing sludge after secondary drying.

[0070] The high-temperature gas after secondary drying and the inert gas after heating are transported to the heat collector through the third tail gas recycling pipe.

[0071] This application discloses a multi-stage pneumatic heat exchange-based fluorinated sludge recycling device. The device first disperses the fluorinated sludge to be dried, ensuring full contact between the sludge and hot air. A first drying structure then dries the sludge, removing most of the free water. The sludge, after the first drying, enters a second drying structure at a higher temperature. A second dispersion component further disperses the sludge, extending its residence time in the second drying structure and ensuring continued contact with the hot air. This second drying process improves the uniformity, effectiveness, and efficiency of the drying process, effectively reducing the moisture content of the fluorinated sludge to meet the production requirements of hydrofluoric acid. Attached Figure Description

[0072] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0073] Figure 1 This is a schematic diagram of the structure of a fluorine-containing sludge recycling device based on multi-stage pneumatic heat exchange in one embodiment of this application.

[0074] Figure 2 This is a flowchart of a method for recycling and utilizing fluorinated sludge based on multi-stage aerodynamic heat exchange in one embodiment of this application.

[0075] Figure 3This is a flowchart of step S101 in one embodiment of this application;

[0076] Figure 4 This is a flowchart of step S102 in one embodiment of this application;

[0077] Figure 5 This is a flowchart of step S103 in one embodiment of this application;

[0078] Figure 6 This is a flowchart of step S104 in one embodiment of this application.

[0079] Explanation of reference numerals in the attached figures:

[0080] 100. Heating structure; 101. Heat collector; 1011. Shell; 1012. Phase change sleeve; 102. Air inlet pipe; 103. First air outlet pipe; 104. Second air outlet pipe; 105. First exhaust gas recycling pipe; 1051. Exhaust pipe; 106. First heating element; 107. Second heating element; 200. First drying structure; 201. First dispersing assembly; 2011. Motor; 2012. Dispersing rotor; 202. First drying chamber; 203. Air inlet; 204. Feed inlet; 205. Cyclone dust collector; 206. First conveying pipe; 20 7. First hopper; 208. Second exhaust gas recycling pipe; 209. Material conveying pipe; 300. Second drying structure; 301. Second dispersing component; 3011. Guide baffle; 3012. Vibrator; 302. Second drying chamber; 303. First air inlet pipe; 304. Second air inlet pipe; 305. Third air inlet pipe; 306. Flow regulating valve; 307. Second hopper; 308. Hot air heat exchanger; 309. Second conveying pipe; 310. Third hopper; 311. Third exhaust gas recycling pipe; 312. Fan; 313. Inert air source; 314. Conveyor belt. Detailed Implementation

[0081] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0082] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The following will be combined with... Figures 1-6 The embodiments of this application will be described below.

[0083] This application provides a device for the recycling and resource recovery of fluorinated sludge based on multi-stage pneumatic heat exchange. See [link to relevant documentation]. Figure 1 The device includes a heating structure 100, a first drying structure 200, and a second drying structure 300. The air inlet of the heating structure 100 is connected to the air outlet of the air supply structure. The air outlet of the heating structure 100 is connected to the air inlet of the first drying structure 200 and the second drying structure 300, respectively. The air outlets of the first drying structure 200 and the second drying structure 300 are both connected to the heating structure 100. The feed end of the second drying structure 300 is connected to the discharge end of the first drying structure 200.

[0084] The first drying structure 200 is equipped with a first dispersing component 201, which is used to disperse the fluorine-containing sludge to be dried. The first drying structure 200 is used to perform a primary drying of the dispersed fluorine-containing sludge. The second drying structure 300 is equipped with a second dispersing component 301, which is used to further disperse the fluorine-containing sludge dried by the first drying structure 200. The second drying structure 300 is used to perform a secondary drying of the fluorine-containing sludge after secondary dispersion. The temperature inside the second drying structure 300 is higher than the temperature inside the first drying structure 200.

[0085] In this embodiment, the air supply structure fills the heating structure 100 with fresh air, which is then heated and transported to the first drying structure 200 and the second drying structure 300, ensuring that the temperature in the second drying structure 300 is higher than that in the first drying structure 200. The fluorinated sludge to be dried is then placed into the first drying structure 200, where the first dispersing component 201 disperses it, ensuring thorough contact between the dispersed sludge and the hot air. This achieves a single drying process, removing most of the free water from the fluorinated sludge. After the initial drying, the fluorinated sludge enters the second drying structure 300, which has a higher temperature. The second dispersing component 301 further disperses the fluorinated sludge, extending its residence time in the second drying structure 300. This allows the dispersed fluorinated sludge to fully contact the hot air in the second drying structure 300, achieving secondary drying of the fluorinated sludge and completely removing any remaining moisture, thus achieving complete drying of the fluorinated sludge.

[0086] The high-temperature exhaust gas generated after the first drying structure 200 and the second drying structure 300 dry the fluorinated sludge is returned to the heating structure 100 to preheat the fresh air input by the air supply structure, thereby realizing the recovery and utilization of heat energy and improving the heat energy utilization efficiency of the device.

[0087] In one possible implementation, both the first drying structure 200 and the second drying structure 300 can be fluidized beds.

[0088] In some embodiments, see Figure 1 The heating structure 100 includes: a heat collector 101, a first air outlet pipe 103, a second air outlet pipe 104, and a first exhaust gas recycling pipe 105. The air inlet of the heat collector 101 is connected to the air outlet of the air supply structure through the air inlet pipe 102. One end of the first air outlet pipe 103 is connected to the air outlet of the heat collector 101, and the other end of the first air outlet pipe 103 is connected to the air inlet of the first drying structure 200. One end of the second air outlet pipe 104 is connected to the air outlet of the heat collector 101. The first drying structure 200 and the second drying structure 300 are connected at one end and the other end, respectively. The first exhaust gas recycling pipe 105 is connected to the heat collector 101 at one end and to the exhaust end of the air supply structure at the other end. A first heating element 106 is installed on the first exhaust pipe 103, and a second heating element 107 is installed on the second exhaust pipe 104. Both the exhaust ends of the first drying structure 200 and the second drying structure 300 are connected to the heat collector 101. This allows for sufficient heating of the air input to the air supply structure, enabling the delivery of hot air at different temperatures to the first drying structure 200 and the second drying structure 300, thereby improving the drying uniformity and efficiency of the fluorinated sludge.

[0089] In one possible implementation, see Figure 1 The heat collector 101 may include a housing 1011 and a phase change sleeve 1012. The phase change sleeve 1012 is disposed inside the housing 1011. One end of the air inlet pipe 102 is connected to the air outlet of the air supply structure, and the other end of the air inlet pipe 102 extends into the housing 1011 and is connected to the air inlet of the phase change sleeve 1012. One end of the first air outlet pipe 103 and the second air outlet pipe 104 are both connected to the air outlet of the phase change sleeve 1012.

[0090] Optionally, the phase change bushing 1012 can be made of a phase change material with high thermal conductivity. In this way, the phase change bushing 1012 absorbs heat from the high-temperature exhaust gas.

[0091] For example, a high thermal conductivity phase change material can be at least one of calcium fluoride ceramics, paraffin wax, liquid metal, and expanded graphite.

[0092] Optionally, the phase change temperature of the phase change bushing 1012 can be 350 degrees Celsius.

[0093] In one possible implementation, see Figure 1 The heat collector 101 may also include a main air outlet pipe, one end of which extends into the housing 1011 and is connected to the air outlet end of the phase change sleeve 1012, and the other end of which is connected to the first air outlet pipe 103 and the second air outlet pipe 104 respectively.

[0094] In one possible implementation, see Figure 1 One end of the first exhaust gas recirculation pipe 105 is connected to the housing 1011, and the other end of the first exhaust gas recirculation pipe 105 is connected to the air outlet of the air supply structure. An exhaust pipe 1051 is provided on the first exhaust gas recirculation pipe 105.

[0095] Optionally, the exhaust pipe 1051 may be located at the rear end of the first exhaust gas recirculation pipe 105, and the diameter of the exhaust pipe 1051 may be smaller than the diameter of the first exhaust gas recirculation pipe 105.

[0096] In this embodiment, after the first drying structure 200 and the second drying structure 300 dry the fluorinated sludge, the high-temperature exhaust gas generated enters the housing 1011 of the heat collector 101. The high-temperature gas flow continuously in the cavity between the housing 1011 and the phase change sleeve 1012. During the flow, the heat in the high-temperature exhaust gas is stored in the phase change sleeve 1012, and the gas enters the first exhaust gas reuse pipe 105. A portion of the gas is discharged from the heating structure 100 through the exhaust pipe 1051, while another portion of the gas is reused at the low-temperature air inlet. When the low-temperature air enters the heat collector 101, it passes directly through the phase change sleeve 1012. The phase change sleeve 1012 rapidly releases heat to heat the low-temperature air passing through it, thus preheating the low-temperature air. The preheated air then enters the first heating element 106 and the second heating element 107 respectively. The first heating element 106 and the second heating element 107 heat the air to the temperature required by the first drying structure 200 and the second drying structure 300, thereby improving the overall thermal energy utilization rate of the device.

[0097] In one possible implementation, the temperature within the first drying structure 200 can be 120-150℃, and the temperature within the second drying structure 300 can be 160-200℃. This two-stage drying process, achieved by gradually increasing the temperature, improves the drying efficiency of the device.

[0098] In some embodiments, see Figure 1 The first drying structure 200 includes a first drying chamber 202 and a feed inlet 204. The air inlet 203 of the first drying chamber 202 is connected to a first air outlet 103. The feed inlet 204 is located at the top of the first drying chamber 202. A first dispersing component 201 is disposed inside the first drying chamber 202, below the feed inlet 204, to disperse the fluorinated sludge entering the first drying chamber 202. This allows for sufficient contact between the fluorinated sludge and the high-temperature gas, improving the drying efficiency of the fluorinated sludge.

[0099] In one possible implementation, the first drying chamber 202 can be arranged along the length direction, and the feed inlet 204 is located on the side of the first drying chamber 202 near the air inlet 203.

[0100] In one possible implementation, the first dispersing component 201 is located below the air inlet 203.

[0101] In some embodiments, see Figure 1 The first dispersing component 201 includes a motor 2011 and a dispersing rotor 2012. The motor 2011 is located at one end of the first drying chamber 202, and the dispersing rotor 2012 is connected to the output end of the motor 2011 and is located below the feed inlet 204. This allows for thorough dispersing of the fluorinated sludge entering the first drying chamber 202, ensuring sufficient contact between the fluorinated sludge and the high-temperature gas.

[0102] In one possible implementation, the dispersing rotor 2012 is rotatably installed inside the first drying chamber 202. The dispersing rotor 2012 extends along the axis of the first drying chamber 202. One end of the dispersing rotor 2012 extends out of the first drying chamber 202 and is connected to the output end of the motor 2011. The motor 2011 is fixedly installed on the outer wall of the first drying chamber 202.

[0103] Understandably, after the high-moisture-content fluorinated sludge enters the first drying chamber 202 through the feed inlet 204, the high-speed rotating dispersing rotor 2012 breaks up the clumps of fluorinated sludge. The dispersed sludge then comes into full contact with the high-temperature gas, carrying away a large amount of moisture, thus achieving primary drying of the fluorinated sludge. The dispersing rotor 2012 continuously disperses the fluorinated sludge, preventing it from agglomerating during the drying process and improving the drying effect of the first drying structure 200 on the fluorinated sludge.

[0104] In some embodiments, see Figure 1 The first drying structure 200 further includes a cyclone dust collector 205 and a first hopper 207. The feed end of the cyclone dust collector 205 is connected to the outlet end of the first drying chamber 202 via a first conveying pipe 206. The first hopper 207 is located at the discharge end of the cyclone dust collector 205. The air outlet end of the cyclone dust collector 205 is connected to the heat collector 101 via a second exhaust gas recycling pipe 208. The discharge end of the first hopper 207 is connected to the feed end of the second drying structure 300 via a material conveying pipe 209. This allows for the separation of the dried fluorinated sludge and high-temperature exhaust gas, facilitating further processing of both.

[0105] It should be noted that the fluorinated sludge and high-temperature exhaust gas after the first drying process enter the cyclone dust collector 205 together through the first conveying pipe 206. The cyclone dust collector 205 separates the fluorinated sludge and the high-temperature exhaust gas. The separated fluorinated sludge enters the first silo 207 and enters the second drying structure 300 through the material conveying pipe 209. The separated high-temperature gas enters the heat collector 101 through the second exhaust gas recycling pipe 208.

[0106] In some embodiments, see Figure 1 The second drying structure 300 includes a second drying chamber 302, a first air inlet pipe 303, a second air inlet pipe 304, and a third air inlet pipe 305. The second drying chamber 302 has a first air inlet, a second air inlet, and a third air inlet. The first air inlet is located at one end of the second drying chamber 302, the second air inlet is located at the other end of the second drying chamber 302, and the third air inlet is located below the first air inlet. The first air inlet pipe 303 connects the first air inlet and the second air outlet pipe 104, the second air inlet pipe 304 connects the second air inlet and the first air inlet pipe 303, and the third air inlet pipe 305 connects the third air inlet and the first air inlet pipe 303. A second dispersing component 301 is disposed in the second drying chamber 302 to disperse the fluorinated sludge entering the second drying chamber 302. In this way, secondary dispersing and drying of the fluorinated sludge can be achieved, ensuring sufficient contact between the fluorinated sludge and the high-temperature gas, and improving the drying uniformity and drying efficiency of the fluorinated sludge.

[0107] In one possible implementation, see Figure 1 Each of the first air inlet pipe 303, the second air inlet pipe 304, and the third air inlet pipe 305 is equipped with a flow regulating valve 306. In this way, the flow rate of the gas in the first air inlet pipe 303, the second air inlet pipe 304, and the third air inlet pipe 305 can be adjusted, thereby adjusting the amount of high-temperature gas entering the second drying chamber 302.

[0108] Optionally, the gas flow velocity in the first air inlet pipe 303, the second air inlet pipe 304 and the third air inlet pipe 305 can be 0.8-1.5 m / s.

[0109] In one possible implementation, the second drying chamber 302 can be arranged along the length direction, and the feed inlet of the second drying chamber 302 is located on the side of the second drying chamber 302 near the first air inlet.

[0110] Optionally, the first air inlet and the second air inlet can be arranged on the same axis.

[0111] Furthermore, the first air inlet and the second air inlet can be located on the axis of the second drying chamber 302.

[0112] In one possible implementation, see Figure 1 The flow regulating valve 306 on the first air inlet pipe 303 can be located between the second air inlet pipe 304 and the third air inlet pipe 305.

[0113] Optionally, the diameter of the third air inlet pipe 305 is smaller than the diameter of the first air inlet pipe 303.

[0114] In one possible implementation, see Figure 1The second drying chamber 302 is provided with a feed inlet at the top. The feed inlet is located on the side of the second drying chamber 302 near the first air inlet. The feed inlet is connected to the discharge end of the first hopper 207 through a material conveying pipe 209.

[0115] In some embodiments, see Figure 1 The second dispersing assembly 301 includes at least one set of guide groups and multiple vibrators 3012. The at least one set of guide groups includes multiple guide baffles 3011 spaced apart. The multiple guide baffles 3011 are radially arranged on the inner wall of the second drying chamber 302, with an included angle between adjacent guide baffles 3011. The multiple vibrators 3012 are evenly arranged on the circumferential inner wall of the second drying chamber 302. This allows for secondary dispersing of the fluorinated sludge entering the second drying chamber 302, ensuring sufficient contact between the fluorinated sludge and the high-temperature gas.

[0116] It is understandable that the flow guide baffle 3011 is arranged radially along the inner wall of the second drying chamber 302.

[0117] In one possible implementation, see Figure 1 Each flow guide group includes four flow guide baffles 3011 spaced apart. The angle between each flow guide baffle 3011 and the horizontal plane can be 45 degrees, and the angle between two adjacent flow guide baffles 3011 can be 90 degrees. In this way, every four flow guide baffles 3011 form a square space.

[0118] It should be noted that there is a gap between any two adjacent guide baffles 3011, two of the four guide baffles 3011 are located above the axis of the second drying chamber 302, and the other two of the four guide baffles 3011 are located below the axis of the second drying chamber 302.

[0119] In one possible implementation, the angle between the flow guide baffle 3011 and the horizontal plane can be adjusted.

[0120] In one possible implementation, see Figure 1 The number of guide groups can be multiple, and the multiple guide groups are arranged at intervals along the axial direction of the second drying chamber 302.

[0121] It should be noted that two adjacent flow guide groups have four flow guide baffles 3011 that are close to each other. Two of the four flow guide baffles 3011 are located above the axis of the second drying chamber 302, and the other two of the four flow guide baffles 3011 are located below the axis of the second drying chamber 302.

[0122] Further, see Figure 1The two guide baffles 3011 located above or below the axis of the second drying chamber 302, together with the inner wall of the second drying chamber 302 on the same side, form a space.

[0123] In one possible implementation, a plurality of vibrators 3012 form an ultrasonic array.

[0124] It should be noted that after the fluorinated sludge is dried once, it enters the second drying chamber 302. The high-frequency vibration generated by the ultrasonic array composed of multiple vibrators 3012 produces acoustic flow and cavitation effect in the second drying chamber 302, which breaks up the soft agglomerates and some weakly bound hard agglomerates between the fluorinated sludge particles. This allows the fluorinated sludge particles to be suspended in the airflow in the form of smaller aggregates or single particles, so as to achieve full contact between the fluorinated sludge and the hot air and achieve efficient drying of the fluorinated sludge.

[0125] Furthermore, the array-type vibrator 3012 can generate a uniform sound field, avoid local overheating or vibration blind spots in the second drying chamber 302, prevent the vibrator 3012 from directly contacting the high-temperature airflow and fluorinated sludge particles, and improve the service life of the vibrator 3012.

[0126] In one possible implementation, the flow rate of the first air inlet is greater than that of the second air inlet. This allows the fluorinated sludge to flow continuously from the first air inlet to the second air inlet, ensuring sufficient contact between the fluorinated sludge and the high-temperature gas, facilitating the discharge of the dried fluorinated sludge from the second drying chamber 302. In one example, the flow rate of the first air inlet is 10-20% greater than that of the second air inlet.

[0127] In one possible implementation, see Figure 1 There is a gap between the guide assembly and the vibrator 3012, and the third air inlet is located between the guide assembly and the vibrator 3012. In this way, it can be prevented that the fluorinated sludge, when continuously flowing from the first air inlet to the second air inlet, will settle to the bottom of the second drying chamber 302 due to gravity.

[0128] In one possible implementation, the flow rate of the second air inlet is greater than that of the third air inlet. This prevents fluoride-containing sludge particles from settling to the bottom of the second drying chamber 302 due to gravity, while also preventing disruption to the continuous flow of fluoride-containing sludge from the first air inlet to the second air inlet.

[0129] In this embodiment, after the fluorinated sludge has been dried once, it enters the second drying chamber 302. The hot air output from the first air inlet duct 303 carries the fluorinated sludge into the space formed by the guide baffles 3011 and the gap between the guide group and the vibrator 3012. The sludge collides with the hot air output from the second air inlet duct 304 inside the second drying chamber 302. At the point of impact, the fluorinated sludge forms a vortex impact surface, causing some of the fluorinated sludge to escape in all directions, impacting the surrounding guide baffles 3011. Under the action of the guide baffles 3011, the fluorinated sludge rebounds. Simultaneously, the fluorinated sludge entering the gap between the guide group and the vibrator 3012 is impacted by the guide baffles 3011. The fluorinated sludge rebounds under the obstruction, and part of it falls back into the vortex in the middle of the second drying chamber 302. Another part of it forms a small vortex in the space above or below the axis of the second drying chamber 302, so that the fluorinated sludge forms multiple vortices in multiple sets of guide groups. The vortices continuously disperse the aggregated fluorinated sludge. In addition, the ultrasonic array composed of multiple vibrators 3012 continuously disperses the fluorinated sludge particles to prevent the fluorinated sludge from agglomerating. This allows the fluorinated sludge to fully contact the hot air output from the first air inlet pipe 303 and the second air inlet pipe 304, so that the residual moisture in the fluorinated sludge is further dried, improving the drying effect of the fluorinated sludge.

[0130] The flow rate of the first air inlet is greater than that of the second air inlet, causing the fluorinated sludge to flow sequentially within multiple sets of guide groups. This allows the fluorinated sludge to break free from the swirling motion in the previous space and form a swirling motion in the next space. Consequently, the fluorinated sludge continuously flows from the first air inlet to the second air inlet within the second drying chamber 302, improving the dispersibility and drying degree of the fluorinated sludge.

[0131] The hot air output from the third air inlet is located below the first and second air inlets. The flow rate of the third air inlet is less than that of the second air inlet. The third air inlet continuously outputs hot air to the bottom of the second drying chamber 302 to prevent the fluorinated sludge from settling to the bottom of the second drying chamber 302 due to gravity during its flow within the chamber.

[0132] In some embodiments, see Figure 1 The second drying structure 300 further includes a second hopper 307, a hot air heat exchanger 308, and a third hopper 310. The second hopper 307 is located inside the second drying chamber 302, near the second air inlet. The feed end of the hot air heat exchanger 308 is connected to the outlet end of the second hopper 307 via a second conveying pipe 309. The third hopper 310 is located at the discharge end of the hot air heat exchanger 308. The air outlet end of the hot air heat exchanger 308 is connected to the heat collector 101 via a third exhaust gas recycling pipe 311. This allows for the collection of dried fluorinated sludge, rapid cooling of the fluorinated sludge, and facilitates its entry into the next process.

[0133] It should be noted that the second silo 307 is located on the bottom inner wall of the second drying chamber 302. The second silo 307 is positioned opposite the third air inlet. The hot air output from the third air inlet flows to the second silo 307 and is blocked by the second silo 307, causing the fluorinated sludge dried in the second drying chamber 302 to settle into the second silo 307 under the action of gravity. The fluorinated sludge in the second silo 307 enters the hot air heat exchanger 308 through the second conveying pipe 309. The high-temperature exhaust gas enters the heat collector 101 through the third exhaust gas return pipe 311. The dried fluorinated sludge enters the third silo 310.

[0134] In one possible implementation, see Figure 1 The discharge end of the third silo 310 is equipped with a conveyor belt 314. In this way, the dried fluorine-containing sludge is transported to the next process.

[0135] In one possible implementation, the third exhaust gas recirculation pipe 311 may be connected to the second exhaust gas recirculation pipe 208.

[0136] In some embodiments, see Figure 1 The air inlet of the hot air heat exchanger 308 is connected to a fan 312, and the air inlet of the fan 312 is connected to an inert gas source 313. In this way, inert gas can be introduced into the hot air heat exchanger 308 to improve the purity of the fluoride-containing sludge.

[0137] It should be noted that the low-temperature inert gas enters the hot air heat exchanger 308 through the fan 312, and comes into full contact with the dried fluorine-containing sludge to achieve rapid cooling of the fluorine-containing sludge. In addition, the inert gas purging can prevent the fluorine-containing sludge from coming into contact with the outside air, thereby avoiding hydrolysis side reactions, preventing the generation of HF gas and oxidation of the fluorine-containing sludge, and improving the chemical purity of the fluorine-containing sludge.

[0138] Furthermore, embodiments of this application also provide a method for the recycling and resource recovery of fluoride-containing sludge based on multi-stage aerodynamic heat exchange, see [link to relevant documentation]. Figure 2 The method, applied to the fluorinated sludge recycling device based on multi-stage pneumatic heat exchange in any of the above embodiments, includes:

[0139] Step S101: Air is introduced into the heating structure 100, and the heating structure 100 provides hot drying air to the first drying structure 200 and the second drying structure 300.

[0140] Step S102: Add the fluorinated sludge to be dried into the first drying structure 200. The first dispersing component 201 disperses the fluorinated sludge to be dried once, and the first drying structure 200 dries the dispersed fluorinated sludge once.

[0141] Step S103: The fluorinated sludge that has been dried once is conveyed to the second drying structure 300. The second dispersing component 301 disperses the fluorinated sludge that has been dried once, and the second drying structure 300 dries the fluorinated sludge that has been dispersed twice.

[0142] Step S104: The exhaust gas generated after primary drying and secondary drying is sent to the heating structure 100 to heat the incoming air.

[0143] In this embodiment, the air supply structure delivers air into the heat collector 101 via the air inlet duct 102. The air is preheated by a large amount of heat released by the highly thermally conductive phase change sleeve 1012. The preheated air is then heated to its rated temperature by the first heating element 106 and the second heating element 107, and then input into the first drying chamber 202 and the second drying chamber 302 via the first air outlet duct 103 and the second air outlet duct 104, respectively. Fluorine-containing sludge with high moisture content enters the first drying chamber 202 through the feed inlet 204. The motor 2011 drives the dispersing rotor 2012 to rotate at high speed, thoroughly breaking up the agglomerated fluorine-containing sludge. The broken-up fluorine-containing sludge comes into full contact with the high-temperature gas, carrying away a large amount of moisture, thus achieving the drying of the fluorine-containing sludge. After drying, the fluorinated sludge and high-temperature exhaust gas enter the cyclone dust collector 205 through the first conveying pipe 206. The cyclone dust collector 205 separates the fluorinated sludge and high-temperature exhaust gas. The separated high-temperature gas enters the heat collector 101 through the second exhaust gas recycling pipe 208. The separated fluorinated sludge enters the first silo 207 and enters the second drying chamber 302 through the material conveying pipe 209. After being preheated by the heat collector 101 and heated by the second heating element 107, the air enters the second drying chamber 302 through the first air inlet, the second air inlet, and the third air inlet. The hot air output from the first air inlet carries fluorinated sludge and comes into counter-current contact with the hot air output from the second air inlet. This causes the fluorinated sludge to swirl between the guide baffles 3011 and between the guide baffles 3011 and the vibrators 3012. Furthermore, the ultrasonic array composed of multiple vibrators 3012 continuously disperses the fluorinated sludge particles, preventing the fluorinated sludge from agglomerating. The dispersed fluorinated sludge... The hot air from the first air inlet 303 and the second air inlet 304 comes into full contact with the fluorinated sludge, further drying the residual moisture. The third air inlet continuously outputs hot air to the bottom of the second drying chamber 302, preventing the fluorinated sludge from settling to the bottom of the second drying chamber 302 due to gravity during its flow. The flow rate of the first air inlet is greater than that of the second air inlet, causing the fluorinated sludge to flow sequentially within multiple sets of guide groups. This allows the dried fluorinated sludge in the second drying chamber 302 to settle into the second silo 307 under gravity. The fluorinated sludge in the second silo 307 enters the hot air heat exchanger 308 through the second conveying pipe 309. Low-temperature inert gas enters the hot air heat exchanger 308 through the fan 312, coming into full contact with the dried fluorinated sludge to achieve rapid cooling, preventing the fluorinated sludge from contacting outside air, avoiding hydrolysis side reactions, and preventing the generation of HF gas and oxidation of the fluorinated sludge.After cooling, the fluorinated sludge enters the third silo 310 and is transported to the production section via conveyor belt 314. The high-temperature exhaust gas and the heated inert gas enter the heat collector 101 together with the exhaust gas generated from the first drying through the third exhaust gas recycling pipe 311. They come into contact with the highly thermally conductive phase change sleeve 1012, which absorbs the heat from the high-temperature exhaust gas. Part of the cooled air is discharged from the heating structure 100 through the exhaust pipe 1051, while the other part is recycled to the low-temperature air inlet.

[0144] In some embodiments, see Figure 3 Step S101, the heating structure 100 provides drying hot air to the first drying structure 200 and the second drying structure 300, including:

[0145] Step S1011: Use the heat collector 101 to preheat the air output from the air supply structure.

[0146] Step S1012: The first heating element 106 heats the hot air conveyed to the first drying structure 200 to 120-150°C.

[0147] In step S1013, the second heating element 107 heats the hot air conveyed to the second drying structure 300 to 160-200°C.

[0148] In this embodiment, the large amount of heat released by the highly thermally conductive phase change sleeve 1012 preheats the air entering the heat collector 101. The preheated air then enters the first air outlet duct 103 and the second air outlet duct 104. The first heating element 106 on the first air outlet duct 103 further heats the hot air entering the first air outlet duct 103, raising the temperature to 120-150°C before it is delivered to the first drying chamber 202. The second heating element 107 on the second air outlet duct 104 further heats the hot air entering the second air outlet duct 104, raising the temperature to 160-200°C before it is delivered to the second drying chamber 302.

[0149] In some embodiments, see Figure 4 Step S102: The fluorinated sludge to be dried is added into the first drying structure 200. The first dispersing component 201 disperses the fluorinated sludge once, and the first drying structure 200 dries the dispersed fluorinated sludge once. This includes:

[0150] Step S1021: The fluorine-containing sludge with high water content is fed into the first drying chamber 202 through the feed inlet 204.

[0151] Step S1022: The motor 2011 drives the dispersing rotor 2012 to rotate at high speed in the first drying chamber 202 to fully disperse the fluoride-containing sludge.

[0152] Step S1023: The broken-up fluorine-containing sludge is brought into full contact with the hot air entering the first drying chamber 202 to dry the fluorine-containing sludge once.

[0153] In this embodiment, fluorinated sludge with high moisture content is fed into the first drying chamber 202 through the feed inlet 204. The motor 2011 drives the dispersing rotor 2012 to rotate at high speed to fully disperse the clumps of fluorinated sludge, so that the dispersed fluorinated sludge comes into full contact with the high-temperature hot air entering the first drying chamber 202, removing a large amount of moisture and achieving a single drying of the fluorinated sludge.

[0154] In some embodiments, see Figure 5 Step S103, conveying the fluorinated sludge dried in the first step to the second drying structure 300, includes:

[0155] Step S1031: The fluorine-containing sludge and high-temperature gas after one drying are transported to the cyclone dust collector 205 through the first conveying pipe 206.

[0156] Step S1032: Use cyclone dust collector 205 to separate fluorine-containing sludge and high-temperature gas, and transport the separated fluorine-containing sludge to the second drying chamber 302 through material conveying pipe 209.

[0157] In this embodiment, the fluorinated sludge and high-temperature exhaust gas after the first drying process enter the cyclone dust collector 205 together through the first conveying pipe 206. The cyclone dust collector 205 separates the fluorinated sludge and the high-temperature exhaust gas. The separated fluorinated sludge enters the first silo 207 and then enters the second drying chamber 302 through the material conveying pipe 209.

[0158] In some embodiments, see Figure 5 Step S103, the second dispersing component 301 further disperses the fluorinated sludge that has been dried once, and the second drying structure 300 further dries the fluorinated sludge that has been dispersed twice, including:

[0159] Step S1033: The hot air heated by the second heating element 107 is introduced into the second drying chamber 302 through the first air inlet, the second air inlet and the third air inlet.

[0160] Step S1034: Use flow regulating valve 306 to adjust the air velocity at the first air inlet, the second air inlet and the third air inlet to 0.8-1.5m / s. The flow rate of the second air inlet is 10-20% smaller than that of the first air inlet, and the flow rate of the third air inlet is smaller than that of the second air inlet.

[0161] Step S1035: Multiple guide baffles 3011 with angled sides collide with the fluorinated sludge carried by hot air to break up the fluorinated sludge, and an ultrasonic array composed of multiple vibrators 3012 is used to break the fluorinated sludge into single particles.

[0162] Step S1036: The fluorinated sludge, which has been broken into single particles, is brought into full contact with the hot air entering the second drying chamber 302 to perform secondary drying of the fluorinated sludge.

[0163] In this embodiment, the air heated by the second heating element 107 enters the second drying chamber 302 through the first air inlet, the second air inlet, and the third air inlet. The flow regulating valve 306 adjusts the air velocity at the first air inlet, the second air inlet, and the third air inlet to 0.8-1.5 m / s, adjusts the flow rate at the second air inlet to be 10-20% lower than the flow rate at the first air inlet, and adjusts the flow rate at the third air inlet to be less than the flow rate at the second air inlet. The hot air output from the first air inlet, carrying fluorinated sludge, comes into countercurrent contact with the hot air output from the second air inlet, causing the fluorinated sludge to move between the guide baffles 3011. The guide baffle 3011 and the vibrator 3012 form a swirling motion, and the ultrasonic array composed of multiple vibrators 3012 continuously disperses the fluorinated sludge particles. The dispersed fluorinated sludge comes into full contact with the hot air output from the first and second air inlets, so that the residual moisture in the fluorinated sludge is further dried. The third air inlet continuously outputs hot air to the bottom of the second drying chamber 302, so as to prevent the fluorinated sludge from settling to the bottom of the second drying chamber 302 due to gravity during the flow process in the second drying chamber 302. The flow rate of the first air inlet is greater than that of the second air inlet, so that the fluorinated sludge flows sequentially in multiple guide groups.

[0164] In some embodiments, see Figure 6 Step S104: The exhaust gas generated after the primary and secondary drying processes is conveyed to the heating structure 100 to heat the incoming air, including:

[0165] Step S1041: The high-temperature gas separated by the cyclone dust collector 205 is transported to the heat collector 101 through the second tail gas recycling pipe 208.

[0166] Step S1042: The fluorine-containing sludge after secondary drying and the high-temperature gas are transported to the hot air heat exchanger 308 through the second conveying pipe 309.

[0167] Step S1043: Low-temperature inert gas is introduced into the hot air heat exchanger 308 to cool the fluorine-containing sludge after secondary drying.

[0168] Step S1044: The high-temperature gas after secondary drying and the inert gas after heating are transported to the heat collector 101 through the third tail gas recycling pipe 311.

[0169] In this embodiment, the cyclone dust collector 205 separates the fluorinated sludge and high-temperature exhaust gas after primary drying. The separated high-temperature gas enters the heat collector 101 through the second exhaust gas reuse pipe 208. The fluorinated sludge and high-temperature gas after secondary drying enter the hot air heat exchanger 308 through the second conveying pipe 309. Low-temperature inert gas enters the hot air heat exchanger 308 through the fan 312, making full contact with the secondary dried fluorinated sludge to achieve rapid cooling. The high-temperature exhaust gas and the heated inert gas enter the heat collector 101 through the third exhaust gas reuse pipe 311. The high-temperature gas entering the heat collector 101 comes into contact with the highly thermally conductive phase change sleeve 1012, which absorbs the heat from the high-temperature gas.

[0170] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0171] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A fluorine-containing sludge recycling device based on multi-stage pneumatic heat exchange, characterized in that, include: A heating structure (100) is provided, wherein the air inlet end of the heating structure (100) is connected to the air outlet end of the air supply structure. The first drying structure (200) has an air inlet connected to the air outlet of the heating structure (100). The first drying structure (200) has a first dispersing component (201) for dispersing fluorine-containing sludge. The first drying structure (200) is used to dry the dispersed fluorine-containing sludge once. The second drying structure (300) has an air inlet connected to the air outlet of the heating structure (100) and a feed inlet connected to the discharge outlet of the first drying structure (200). The second drying structure (300) includes a second drying chamber (302) and a second dispersing component (301). The second dispersing component (301) is disposed in the second drying chamber (302) and is used to disperse the fluorinated sludge that has been dried by the first drying structure (200) and has entered the second drying chamber (302) for secondary dispersing. The second drying structure (300) is used to perform secondary drying on the fluorinated sludge after secondary dispersing. The second drying chamber (302) has a first air inlet, a second air inlet and a third air inlet. The first air inlet and the third air inlet are both located at the first end of the second drying chamber (302). The second air inlet is located at the second end of the second drying chamber (302) opposite to the first end. The first air inlet and the second air inlet are both located on the axis of the second drying chamber (302). The third air inlet is located below the first air inlet. The second dispersing component (301) includes at least one set of flow guides and a plurality of vibrators (3012). The at least one set of flow guides includes a plurality of flow guide baffles (3011) spaced apart. The plurality of flow guide baffles (3011) are arranged radially along the inner wall of the second drying chamber (302). Some of the flow guide baffles (3011) are located above the axis of the second drying chamber (302), and some of the flow guide baffles (3011) are located below the axis of the second drying chamber (302). There is an included angle between two adjacent flow guide baffles (3011). The plurality of vibrators (3012) are evenly arranged on the circumferential inner wall of the second drying chamber (302). The air outlets of the first drying structure (200) and the second drying structure (300) are both connected to the heating structure (100), and the temperature inside the second drying structure (300) is greater than the temperature inside the first drying structure (200).

2. The fluorine-containing sludge recycling device based on multi-stage pneumatic heat exchange according to claim 1, characterized in that, The heating structure (100) includes: A heat collector (101) is connected to the air outlet of the air supply structure via an air inlet pipe (102). The first air outlet pipe (103) has one end connected to the air outlet of the heat collector (101) and the other end connected to the air inlet of the first drying structure (200). The second air outlet pipe (104) has one end connected to the air outlet of the heat collector (101) and the other end connected to the air inlet of the second drying structure (300). The first exhaust gas recirculation pipe (105) has one end connected to the heat collector (101) and the other end connected to the air outlet of the air supply structure. The first air outlet pipe (103) is provided with a first heating element (106), and the second air outlet pipe (104) is provided with a second heating element (107). The air outlets of the first drying structure (200) and the second drying structure (300) are respectively connected to the heat collector (101).

3. The device for recycling fluorine-containing sludge according to claim 2, wherein The first drying structure (200) includes: The first drying chamber (202) has an air inlet (203) connected to the first air outlet pipe (103); The feed inlet (204) is located at the top of the first drying chamber (202); The first dispersing component (201) is disposed in the first drying chamber (202) and is located below the feed inlet (204) to disperse the fluorine-containing sludge entering the first drying chamber (202).

4. The device for recycling fluorine-containing sludge according to claim 3, characterized in that, The first dispersing component (201) includes: A motor (2011) is disposed at one end of the first drying chamber (202); Dispersing rotor (2012) is connected to the output end of the motor (2011) and is located below the feed inlet (204).

5. The device for recycling fluorine-containing sludge according to claim 3, characterized in that, The first drying structure (200) further includes: Cyclone dust collector (205), the feed end of which is connected to the outlet end of the first drying chamber (202) through the first conveying pipe (206); The first hopper (207) is located at the discharge end of the cyclone dust collector (205); The outlet of the cyclone dust collector (205) is connected to the heat collector (101) through the second exhaust gas recycling pipe (208), and the outlet of the first silo (207) is connected to the feed end of the second drying structure (300) through the material conveying pipe (209).

6. The device for recycling fluorine-containing sludge according to claim 3, wherein The second drying structure (300) further includes: The first air inlet pipe (303) is connected between the first air inlet and the second air outlet pipe (104); The second air inlet pipe (304) is connected between the second air inlet and the first air inlet pipe (303); The third air inlet pipe (305) is connected between the third air inlet and the first air inlet pipe (303); The first air inlet pipe (303), the second air inlet pipe (304) and the third air inlet pipe (305) are respectively equipped with flow regulating valves (306), the flow rate of the first air inlet is greater than the flow rate of the second air inlet, and the flow rate of the second air inlet is greater than the flow rate of the third air inlet.

7. The device according to claim 6, wherein, The second drying structure (300) further includes: The second hopper (307) is located inside the second drying chamber (302) on the side near the second air inlet; A hot air heat exchanger (308) is provided, the feed end of which is connected to the outlet end of the second silo (307) via a second conveying pipe (309). The third hopper (310) is located at the discharge end of the hot air heat exchanger (308); The outlet of the hot air heat exchanger (308) is connected to the heat collector (101) through the third exhaust gas recycling pipe (311).

8. The fluorine-containing sludge recycling device based on multi-stage pneumatic heat exchange according to claim 7, characterized in that, The air inlet of the hot air heat exchanger (308) is connected to a fan (312), and the air inlet of the fan (312) is connected to an inert air source (313).

9. A method for the recycling and resource recovery of fluoride-containing sludge based on multi-stage aerodynamic heat exchange, characterized in that, The method applied to the fluorinated sludge recycling device based on multi-stage pneumatic heat exchange as described in any one of claims 1-8 includes: Air is introduced into the heating structure (100), and the heating structure (100) provides hot drying air into the first drying structure (200) and the second drying structure (300); The fluorinated sludge to be dried is added into the first drying structure (200), the first dispersing component (201) disperses the fluorinated sludge once, and the first drying structure (200) dries the dispersed fluorinated sludge once. The fluorinated sludge that has been dried once is transported to the second drying structure (300), the second dispersing component (301) disperses the fluorinated sludge that has been dried once, and the second drying structure (300) dries the fluorinated sludge that has been dispersed twice. The exhaust gas generated after primary and secondary drying is sent to the heating structure (100) to heat the incoming air.

10. The method for recycling and utilizing fluorinated sludge based on multi-stage aerodynamic heat exchange according to claim 9, characterized in that, The heating structure (100) provides drying hot air to the first drying structure (200) and the second drying structure (300), including: The air output from the air supply structure is preheated using a heat collector (101); The first heating element (106) heats the hot air conveyed to the first drying structure (200) to 120-150°C; The second heating element (107) heats the hot air conveyed to the second drying structure (300) to 160-200°C.

11. The method for recycling and utilizing fluoride-containing sludge based on multi-stage aerodynamic heat exchange according to claim 9, characterized in that, The process of adding the fluorinated sludge to be dried into the first drying structure (200), the first dispersing component (201) dispersing the fluorinated sludge once, and the first drying structure (200) drying the dispersed fluorinated sludge once includes: Fluoride-containing sludge with high water content is fed into the first drying chamber (202) through the feed inlet (204); The motor (2011) drives the dispersing rotor (2012) to rotate at high speed in the first drying chamber (202) to fully disperse the fluoride-containing sludge; The broken-up fluorine-containing sludge is brought into full contact with the hot air entering the first drying chamber (202) to dry the fluorine-containing sludge once.

12. The method for recycling and utilizing fluoride-containing sludge based on multi-stage aerodynamic heat exchange according to claim 9, characterized in that, The process of conveying the fluoride-containing sludge that has been dried once to the second drying structure (300) includes: The fluorinated sludge and high-temperature gas after drying are transported to the cyclone dust collector (205) through the first conveying pipe (206); The fluorine-containing sludge and high-temperature gas are separated by a cyclone dust collector (205), and the separated fluorine-containing sludge is transported to the second drying chamber (302) through a material conveying pipe (209).

13. The method for recycling and resource recovery of fluoride-containing sludge based on multi-stage aerodynamic heat exchange according to claim 11, characterized in that, The second dispersing component (301) further disperses the fluorinated sludge that has been dried once, and the second drying structure (300) further dries the fluorinated sludge that has been dispersed twice, including: The hot air heated by the second heating element (107) is introduced into the second drying chamber (302) through the first air inlet, the second air inlet and the third air inlet; The air velocity at the first air inlet, the second air inlet and the third air inlet is adjusted to 0.8-1.5 m / s by using the flow regulating valve (306), so that the flow rate at the second air inlet is 10-20% smaller than the flow rate at the first air inlet, and the flow rate at the third air inlet is smaller than the flow rate at the second air inlet. Multiple baffles (3011) with angled sides collide with the fluorinated sludge carried by hot air to break up the fluorinated sludge, and an ultrasonic array composed of multiple vibrators (3012) is used to break the fluorinated sludge into single particles. The fluorinated sludge, broken into individual particles, is brought into full contact with the hot air entering the second drying chamber (302) to perform secondary drying of the fluorinated sludge.

14. The method for recycling and resource recovery of fluoride-containing sludge based on multi-stage aerodynamic heat exchange according to claim 12, characterized in that, The step of conveying the exhaust gas generated after primary and secondary drying to the heating structure (100) to heat the incoming air includes: The high-temperature gas separated by the cyclone dust collector (205) is transported to the heat collector (101) through the second tail gas recycling pipe (208); The fluorinated sludge after secondary drying and high-temperature gas are transported to the hot air heat exchanger (308) through the second conveying pipe (309); Low-temperature inert gas is introduced into the hot air heat exchanger (308) to cool the fluorine-containing sludge after secondary drying; The high-temperature gas after secondary drying and the inert gas after heating are transported to the heat collector (101) through the third tail gas recycling pipe (311).

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