A segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemical industry

Abstract

This invention belongs to the field of rotary kilns and provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. It includes a mounting platform, a furnace body, and a two-stage temperature control system. The furnace body is mounted on the mounting platform, which is used to adjust the angle of the furnace body. The furnace body includes a first-stage furnace, a second-stage furnace, a transition furnace, a third-stage furnace, and a fourth-stage furnace. The first-stage and fourth-stage furnaces are fixedly mounted on the mounting platform via mounting bases, and the second-stage furnace is rotatably connected to the first-stage furnace. This invention employs a two-stage temperature control system to achieve independent and precise temperature control for the initial reaction at 300-350℃ in the first-stage furnace and the further reaction at 400-450℃ in the second-stage furnace. Temperature fluctuations are controlled within ±0.3℃, perfectly adapting to the segmented requirements of the endothermic metathesis reaction of fluorite powder and concentrated sulfuric acid, effectively improving the fluorite powder conversion rate (≥98.5%). Compared to traditional single-temperature control equipment, the conversion rate is increased by 1-2%, while avoiding local overheating and impurities, thus improving the purity of hydrogen fluoride products.

Description

Technical Field

[0001] This invention belongs to the field of rotary kilns, and particularly relates to a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. Background Technology

[0002] Fluorochemicals are an important branch of modern chemical engineering. Hydrogen fluoride (HF), as a core raw material in the fluorochemical industry, is widely used in the production of fluorinated refrigerants, fluoropolymers, and fluorinated fine chemicals. Currently, the industrial production of hydrogen fluoride mainly utilizes the endothermic metathesis reaction between fluorite powder and concentrated sulfuric acid.

[0003] The current production of hydrogen fluoride mostly uses traditional horizontal rotary furnaces, which suffer from a single technical pain point: existing traditional horizontal rotary furnaces mostly use overall jacket heating, which cannot achieve precise segmented temperature control, resulting in problems such as incomplete reaction, low conversion rate of fluorite powder, or local overheating leading to the decomposition of concentrated sulfuric acid and the generation of impurities. Summary of the Invention

[0004] The purpose of this invention is to provide a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals, which aims to solve the technical problems in the prior art, such as incomplete reaction, low fluorite powder conversion rate, or local overheating leading to the decomposition of concentrated sulfuric acid and the generation of impurities, caused by the single temperature control method of rotary kilns.

[0005] This invention is implemented as follows: a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals includes a mounting platform and a furnace body. The furnace body is mounted on the mounting platform, which is used to adjust the angle of the furnace body to realize the transfer of raw materials in the two reaction chambers and the discharge of raw material residue. The furnace body includes a first-stage furnace, a second-stage furnace, a transition furnace, a second-stage furnace, a third-stage furnace, and a two-stage temperature control system. The first-stage furnace and the third-stage furnace are both fixedly mounted on the mounting platform by fixed seats. The first-stage furnace is rotatably connected to the first-stage furnace by bearings, and the second-stage furnace is rotatably connected to the third-stage furnace by bearings. The transition furnace is fixedly connected between the first-stage furnace and the second-stage furnace. The two output terminals of the two-stage temperature control system are respectively set on the inner walls of the first-stage furnace and the second-stage furnace. The two-stage temperature control system is used to heat the inner chambers of the first-stage furnace and the second-stage furnace respectively.

[0006] Two support mechanisms are also installed on the mounting platform. The two support mechanisms are respectively connected to the first stage furnace and the second stage furnace. The support mechanisms are used to support the first stage furnace, the transition section furnace and the second stage furnace.

[0007] A drive mechanism is also installed on the mounting platform. The output end of the drive mechanism is connected to the transition section furnace. The drive mechanism is used to drive the transition section furnace, the first section furnace and the rear rolling ring to rotate.

[0008] A feeding premixer is installed at one end of the mounting platform. One end of the feeding premixer is connected to the first-stage furnace. The feeding premixer is used to premix the solid and liquid phase raw materials and transport them into the first-stage furnace, and to discharge the generated hydrogen fluoride gas.

[0009] The tail section furnace has an inlet pipe connected to its side. The inlet pipe is used to introduce inert gas into the furnace body to drive out the oxygen in the furnace body and prevent oxygen from reacting with hydrogen fluoride gas. The bottom of the tail section furnace has a mixture outlet. The mixture outlet is used to discharge the solid and liquid residue after the reaction so that the raw materials can be replaced for the next processing. The mixture outlet is equipped with a valve.

[0010] Further technical solution: The furnace body consists of an anti-corrosion layer, an insulation layer and an outer shell layer from the inside out. The furnace body adopts a "sealed end cap" design at both ends. The connection between the end cap and the furnace body is sealed with a polytetrafluoroethylene sealing gasket to prevent HF gas leakage and air from entering the furnace.

[0011] Further technical solution: The mounting platform includes a base, a mounting plate, and a hydraulic telescopic rod. The mounting plate is hinged to the base, the furnace body is mounted on the top of the mounting plate, and the hydraulic telescopic rod is hinged inside the base. The movable end of the hydraulic telescopic rod is hinged to the bottom of the mounting plate.

[0012] Further technical solution: The two-stage temperature control system includes two jackets, an intelligent temperature control linkage system, and a waste heat recovery structure. The two jackets are installed in the inner walls of the first-stage furnace and the second-stage furnace, respectively. The two jackets are independent of each other and do not interfere with each other.

[0013] The jacket includes a jacket cavity with several fins added to the inner wall of the jacket cavity. One end of the fins extends into the furnace body to enhance the heat transfer efficiency between the jacket cavity and the furnace body. The jacket cavity is located between the insulation layer and the anti-corrosion layer to reduce heat loss. Both the first-stage furnace and the second-stage furnace are equipped with two connecting pipes, one end of which is connected to the jacket cavity. The first-stage furnace is also rotatably equipped with a No. 2 hot gas inlet and a No. 2 hot gas outlet, which are respectively connected to the two connecting pipes. The second-stage furnace is also rotatably equipped with a No. 1 hot gas inlet and a No. 1 hot gas outlet, which are respectively connected to the two connecting pipes. The No. 2 hot gas inlet, the No. 2 hot gas outlet, the No. 1 hot gas inlet, and the No. 1 hot gas outlet are all fixedly installed on the mounting platform. The No. 2 hot gas inlet and the No. 1 hot gas inlet are respectively connected to two different hot gas inlet pipes, and the No. 2 hot gas outlet and the No. 1 hot gas outlet are respectively connected to two different hot gas outlet pipes to facilitate temperature control of the first-stage furnace and the second-stage furnace respectively.

[0014] The jacket cavity is also equipped with a heating coil, which is electrically heated as an auxiliary temperature control method for jacket heating. Its core function is to compensate for the insufficient uniformity of heat transfer in the jacket and solve the problem of local temperature deviation in the furnace.

[0015] The intelligent temperature control linkage system includes a PLC intelligent control system. Three to four high-temperature resistant and corrosion-resistant temperature sensors are installed in the first and second reaction zones respectively to collect furnace temperature data in real time and transmit it to the control system. The system automatically adjusts the hot air temperature and flow rate of the two jackets and the temperature of the heating coils according to the preset temperature parameters, realizing closed-loop control of "temperature acquisition-data analysis-parameter adjustment". No manual intervention is required, reducing operational errors. It also has an over-temperature warning function. When the furnace temperature exceeds the preset range (±5℃), the hot air supply is automatically cut off and the emergency cooling system is activated to prevent the reaction from getting out of control.

[0016] The waste heat recovery structure is set at the hot air outlet of the two jackets (No. 2 hot air outlet and No. 1 hot air outlet), and a waste heat recovery heat exchanger is set up to recover the waste heat when the hot air is discharged, which is used for raw material drying (fluorite powder drying) and preheating concentrated sulfuric acid, so as to realize heat recycling and reduce energy consumption.

[0017] A further technical solution: the fins are hollow structures with openings, and the fin openings are connected to the jacket cavity.

[0018] Further technical solution: The feeding premixer includes a feeding cylinder and a feeding motor. The feeding cylinder is fixedly installed at the end of the first section furnace and communicates with the interior of the first section furnace. The feeding motor is fixedly installed on the mounting platform. The output shaft of the feeding motor is fixedly connected to a rotating rod. One end of the rotating rod that extends into the feeding cylinder is fixedly connected to a spiral blade. A solid phase feeding pipe, a liquid phase feeding pipe, and a gas outlet pipe are connected sequentially on the feeding cylinder. The solid phase feeding pipe is connected to the solid phase raw material addition pipe, and the liquid phase feeding pipe is connected to the liquid phase raw material addition pipe. The gas outlet pipe is connected to the gas collection pipe through a three-way pipe. The other outlet of the three-way pipe can be connected to the outside to facilitate the collection of hydrogen fluoride gas and the discharge of air from the furnace body.

[0019] The end of the feeding cylinder is provided with an air outlet groove, and the air outlet pipe is connected to the air outlet groove.

[0020] Further technical solution: The drive mechanism includes a drive motor, gears, a gear ring, and a reducer. The drive motor is mounted on the mounting platform. The drive motor is connected to the gears through the reducer. The gear ring is fitted on the outer shell of the transition section furnace. The gears mesh with the gear ring on the outer shell of the transition section furnace, driving the furnace body to rotate smoothly. The transmission system is equipped with an overload protection device. When the furnace body experiences material jamming or overload, the power supply is automatically cut off to prevent equipment damage.

[0021] Further technical solution: The supporting mechanism includes a rolling ring and a support roller. The rolling ring is fitted onto the first-stage furnace / second-stage furnace, and the support roller is fixedly installed on the mounting platform. The support roller and the rolling ring are installed in a rolling motion.

[0022] Further technical solution: A transition section resistance step is provided inside the transition section furnace, and a discharge resistance step is provided on the inner side of the end of the second section furnace near the tail section furnace.

[0023] Further technical solution: There are two furnace bodies, referred to as Furnace No. 1 and Furnace No. 2, both of which are installed on the mounting platform. There is a height difference between Furnace No. 1 and Furnace No. 2. Furnace No. 1 is located above Furnace No. 2. The tail section of Furnace No. 1 is equipped with a screw conveyor. The input end of the screw conveyor is connected to the tail section of Furnace No. 1 (the air inlet pipe and the mixture outlet of Furnace No. 1 can be removed). The output end of the screw conveyor is connected to a guide air box, which is installed on the mounting platform. A screw feeder is installed on one side of the first section of Furnace No. 2. The output end of the screw feeder is connected to the first section of Furnace No. 2. The input end of the screw feeder is connected to the bottom of the guide air box. The top of the guide air box is equipped with an exhaust pipe.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Precise temperature control and high reaction efficiency: The two-stage temperature control system enables independent and precise temperature control for the initial reaction at 300-350℃ in the first stage and the in-depth reaction at 400-450℃ in the second stage. Temperature fluctuations are controlled within ±0.3℃, perfectly meeting the segmented requirements of the endothermic reaction of fluorite powder and concentrated sulfuric acid. This effectively improves the conversion rate of fluorite powder (≥98.5%), which is 1-2% higher than traditional single temperature control equipment. At the same time, it avoids local overheating and the generation of impurities, thus improving the purity of hydrogen fluoride products.

[0026] 2. Uniform material mixing and significant anti-caking effect: The inclined hollow fins inside the furnace work in conjunction with the furnace rotation to fully lift and tumble the material, breaking up material stratification; the feeding premixer ensures that the raw materials are fully mixed in advance, reducing the problem of excessively high local concentration; the anti-corrosion layer inner wall polishing treatment greatly reduces material caking, reducing the amount of caking by more than 60% compared with traditional equipment, reducing the frequency of equipment maintenance and ensuring continuous production.

[0027] 3. Excellent corrosion resistance and reliable safety: The furnace body adopts a composite anti-corrosion layer of "silicon carbide + nano fluoride coating", the end cover is made of Hastelloy, and the sealing parts are made of polytetrafluoroethylene, which can resist the erosion of strong corrosive media in all aspects and prevent hydrogen fluoride gas leakage. At the same time, it is equipped with an inert gas protection system, an over-temperature warning system and an overload protection device, which can effectively prevent safety risks such as reaction runaway and equipment damage, and improve production safety.

[0028] 4. Low energy consumption and energy saving and environmental protection: The heat loss is reduced by the insulation layer design, and the waste heat recovery structure can recover the waste heat of hot air for raw material drying and concentrated sulfuric acid preheating. The energy consumption is reduced by 15-20% compared with the traditional horizontal rotary kiln, realizing heat recycling and meeting the needs of green industrial development.

[0029] 5. Flexible operation and adaptable to continuous production: The mounting platform can flexibly adjust the furnace body angle to control the raw material flow rate and residence time, facilitating the complete discharge of residues; the drive mechanism can achieve stepless speed adjustment to adapt to the needs of different reaction stages; the feeding premixer realizes continuous premixing and conveying of raw materials, and the No. 1 and No. 2 furnaces realize reaction relay, with all components working together to adapt to large-scale continuous industrial production, and perfectly connect with the existing hydrogen fluoride production process without the need for major modifications to the existing process. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0032] Figure 3 This is a schematic diagram of a section of the furnace body in this invention.

[0033] Figure 4 In this invention Figure 3 Enlarged diagram of point A in the middle.

[0034] Figure 5 This is a schematic diagram of the two-section furnace cross-section structure of the furnace body in this invention.

[0035] Figure 6 This is a schematic diagram of the cross-sectional structure of the feeding premixer in this invention.

[0036] In the attached diagram: 1. Tail section furnace; 2. No. 1 hot gas outlet; 3. Rear rolling ring; 4. Second section furnace; 5. No. 1 hot gas inlet; 6. Gear ring; 7. Transition section furnace; 8. Drive motor; 9. First section furnace; 10. Front rolling ring; 11. First section furnace; 12. Mixed material outlet; 13. Feeding premixer; 131. Feeding motor; 132. Feeding cylinder; 133. Solid phase feeding pipe; 134. Liquid phase feeding pipe; 135. Spiral blade; 136. Gas outlet pipe; 137. Gas outlet groove; 138. Rotating rod; 14 141. Mounting platform; 142. Hydraulic telescopic rod; 143. Mounting plate; 144. Placement base; 15. No. 2 hot air inlet; 16. Front support roller; 17. No. 2 hot air outlet; 18. Rear support roller; 19. Transition section resistance step; 20a. No. 1 heating coil; 21a. No. 1 fin; 22a. No. 1 jacket cavity; 23a. No. 1 connecting pipe; 20b. No. 2 heating coil; 21b. No. 2 fin; 22b. No. 2 jacket cavity; 23b. No. 2 connecting pipe; 24. Discharge resistance step; 25. Air inlet pipe. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0039] Example 1

[0040] like Figures 1-6 As shown, this invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals, comprising a mounting platform 14 and a furnace body. The furnace body is mounted on the mounting platform 14, which is used to adjust the angle of the furnace body to realize the transfer of raw materials in the two reaction chambers and the discharge of raw material residue. The furnace body includes a first-stage furnace 11, a first-stage furnace 9, a transition furnace 7, a second-stage furnace 4, a tail-stage furnace 1, and a two-stage temperature control system. The first-stage furnace 11 and the tail-stage furnace 1 are both fixedly mounted on the mounting platform 14 by fixed seats. The first-stage furnace 9 is rotatably connected to the first-stage furnace 11 by bearings, and the second-stage furnace 4 is rotatably connected to the tail-stage furnace 1 by bearings. The transition furnace 7 is fixedly connected between the first-stage furnace 9 and the second-stage furnace 4. The two output terminals of the two-stage temperature control system are respectively set on the inner walls of the first-stage furnace 9 and the second-stage furnace 4. The two-stage temperature control system is used to heat the inner chambers of the first-stage furnace 9 and the second-stage furnace 4 respectively.

[0041] Two support mechanisms are also installed on the mounting platform 14. The two support mechanisms are respectively connected to the first stage furnace 9 and the second stage furnace 4. The support mechanisms are used to support the first stage furnace 9, the transition section furnace 7 and the second stage furnace 4.

[0042] A drive mechanism is also installed on the mounting platform 14. The output end of the drive mechanism is connected to the transition section furnace 7. The drive mechanism is used to drive the transition section furnace 7, the first section furnace 9 and the rear rolling ring 3 to rotate.

[0043] One end of the mounting platform 14 is equipped with a feeding premixer 13. One end of the feeding premixer 13 is connected to the first stage furnace 11. The feeding premixer 13 is used to premix the solid and liquid phase raw materials and transport them into the first stage furnace 11, and to discharge the generated hydrogen fluoride gas.

[0044] The tail section furnace 1 is connected to an air inlet pipe 25 on its side. The air inlet pipe 25 is used to introduce inert gas into the furnace body to drive out the oxygen in the furnace body and prevent oxygen from reacting with hydrogen fluoride gas. The bottom of the tail section furnace 1 is connected to a mixture outlet 12. The mixture outlet 12 is used to discharge the solid and liquid residue after the reaction so that the raw materials can be replaced for the next processing. A valve is provided on the mixture outlet 12.

[0045] Specifically, before use, connect the air inlet pipe 25 to the air pump and introduce inert gas (nitrogen) into the furnace. The inert gas can drive the air in the furnace to the feeding premixer 13 and discharge it from the feeding premixer 13 to prevent the air from contacting and reacting with HF gas, so that the collected hydrogen fluoride gas is purer.

[0046] In use, the solid phase (fluorite powder) and liquid phase (concentrated sulfuric acid) are added to the feed premixer 13 in a certain proportion. The feed premixer 13 premixes the solid and liquid phases and conveys them to the first-stage furnace 11. The raw materials flow from the first-stage furnace 11 into the first-stage furnace 9. The two-stage temperature control system heats the inner cavity of the first-stage furnace 9 to a temperature of 300-350℃, allowing the raw materials to undergo a preliminary reaction. During this period, the drive mechanism rotates the first-stage furnace 9 to stir the raw materials and ensure thorough mixing. Then, the raw materials gradually flow into the second-stage furnace 4. The two-stage temperature control system heats the inner cavity of the second-stage furnace 4 to 400-450℃, allowing the raw materials to undergo a deeper reaction and maintaining the reaction time for 2-3 hours to avoid incomplete reaction or wall clogging due to insufficient or excessive residence time. The hydrogen fluoride gas produced by the reaction is discharged from the feed premixer 13 and collected. The solid residue after the reaction is discharged from the mixture outlet 12.

[0047] This invention addresses the endothermic reaction characteristics of the metathesis of fluorite powder and concentrated sulfuric acid in hydrogen fluoride (HF) production. Combining the requirements of two-stage temperature control, it overcomes the pain points of traditional horizontal rotary kilns, such as "single temperature control, uneven heat transfer, and large differences in material residence time." By incorporating an innovative structural design, it achieves precise temperature control for the initial fluorination in the front stage and the in-depth fluorination in the back stage. At the same time, it enhances functions such as corrosion prevention, anti-wall caking, and material mixing, and is perfectly integrated with existing hydrogen fluoride production processes.

[0048] This invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. In this embodiment, the furnace body adopts a "three-layer composite structure," consisting of an anti-corrosion layer, a heat insulation layer, and an outer shell layer from the inside out. Each layer works together to achieve anti-corrosion, heat insulation, and support functions, as detailed below:

[0049] 1. Outer shell: Made of Q345R carbon structural steel, its main function is to support the overall weight of the furnace body, withstand the slight positive pressure inside the furnace (0.02-0.05MPa) and the load of the external environment. The surface is coated with an anti-rust and anti-corrosion coating (epoxy zinc-rich coating) to extend the service life of the equipment and prevent the external environment from corroding the furnace body.

[0050] 2. Insulation layer: Located between the outer shell layer and the anti-corrosion layer, it is filled with high-temperature resistant, low thermal conductivity aluminum silicate fiber cotton. The outer layer is additionally equipped with a high-temperature resistant, waterproof and moisture-proof layer to prevent the insulation material from absorbing moisture and failing. Its core function is to reduce heat loss in the furnace, reduce energy consumption, and at the same time prevent the outer shell temperature from being too high (control the outer shell temperature ≤60℃) to ensure the safety of operators.

[0051] 3. Anti-corrosion layer (core functional layer): Located in the innermost layer of the furnace body, it is in direct contact with fluorite powder, concentrated sulfuric acid, and HF gas. It adopts a composite structure of "silicon carbide integral molding + nano fluoride coating". The silicon carbide layer is responsible for high temperature resistance and wear resistance, while the nano fluoride coating (polytetrafluoroethylene modified coating) is responsible for resistance to HF and concentrated sulfuric acid corrosion. This solves the industry pain points of corrosion and wall formation on the inner wall of traditional furnaces. At the same time, the inner wall of the anti-corrosion layer is polished to reduce material adsorption and wall formation, and facilitates later cleaning.

[0052] The furnace body adopts a "sealed end cap" design at both ends. The connection between the end cap and the furnace body is sealed with a polytetrafluoroethylene sealing gasket to prevent HF gas leakage and air from entering the furnace. The end cap is made of Hastelloy and is seamlessly connected with the furnace body's anti-corrosion layer, ensuring sealing performance while improving the overall anti-corrosion effect.

[0053] Both heating components are located between the insulation layer and the anti-corrosion layer.

[0054] The present invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemical industry. In this embodiment, the mounting platform 14 includes a placement base 143, a mounting plate 142, and a hydraulic telescopic rod 141. The mounting plate 142 is hinged to the placement base 143, the furnace body is mounted on the top of the mounting plate 142, and the hydraulic telescopic rod 141 is hinged inside the placement base 143. The movable end of the hydraulic telescopic rod 141 is hinged to the bottom of the mounting plate 142.

[0055] Specifically, the extension and retraction of the movable end of the hydraulic telescopic rod 141 can control the angle between the mounting plate 142 and the furnace body, thereby controlling the flow rate of the raw materials in the furnace body. It can be flexibly controlled according to the reaction state. When discharging slag, the angle between the furnace body and the horizontal plane can be increased so that all the slag in the furnace body can be discharged.

[0056] This invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. In this embodiment, the two-stage temperature control system breaks through the limitations of the traditional horizontal rotary furnace's "single jacket temperature control" and adopts a two-stage temperature control structure of "segmented independent jackets + built-in heating coils + intelligent temperature control linkage." This achieves independent and precise temperature control of the first-stage reaction zone (first-stage furnace 9) and the second-stage reaction zone (second-stage furnace 4), with temperature fluctuations controlled within ±0.3℃. This is suitable for the process requirements of hydrogen fluoride production, which involves "preliminary reaction at 300-350℃ in the first stage and in-depth reaction at 400-450℃ in the second stage." The specific structure is as follows:

[0057] 1. Segmented Independent Jacket Structure: The furnace body's first and second reaction zones are each equipped with independent jacket cavities (denoted as Jacket Cavity 1, 22a, and Jacket Cavity 22b). The two jacket cavities are independent and do not interfere with each other. Several fins are added to the inner walls of both jacket cavities (the fins in the first and second reaction zones are denoted as Fin 1, 21a, and Fin 2, 21b, respectively). One end of the fins extends into the furnace body, enhancing the heat transfer efficiency between the jacket cavity and the furnace body. The jacket cavities are positioned between the insulation layer and the anti-corrosion layer to reduce heat loss. Both the first-stage furnace 9 and the second-stage furnace 4 are equipped with two connecting pipes, one end of which connects to the jacket cavity. The two connecting pipes on the first-stage furnace 9 are denoted as Connecting Pipe 1, 23a, and the two connecting pipes on the second-stage furnace 4 are denoted as Connecting Pipe 2, 23b. The second hot gas inlet 15 and the second hot gas outlet 17 are also rotatably installed on the furnace 4. The second hot gas inlet 15 and the second hot gas outlet 17 are respectively connected to two first connecting pipes 23a. The second-stage furnace 4 is also rotatably installed with a first hot gas inlet 5 and a first hot gas outlet 2. The first hot gas inlet 5 and the first hot gas outlet 2 are respectively connected to two second connecting pipes 23b. The second hot gas inlet 15, the second hot gas outlet 17, the first hot gas inlet 5 and the first hot gas outlet 2 are all fixedly installed on the mounting platform 14. The second hot gas inlet 15 and the first hot gas inlet 5 are respectively connected to two different hot gas inlet pipes 25. The second hot gas outlet 17 and the first hot gas outlet 2 are respectively connected to two different hot gas outlet pipes 136, so as to facilitate temperature control of the first-stage furnace 9 and the second-stage furnace 4 respectively.

[0058] 2. First-stage reaction zone jacket cavity (jacket cavity 22a): adopts the "hot air heating" method, introduces hot air at 380-420℃, and transfers heat to the furnace through fins to control the temperature of the first-stage reaction zone to be stable at 300-350℃, which meets the heat requirements of the preliminary metathesis reaction of fluorite powder and concentrated sulfuric acid.

[0059] 3. Second-stage reaction zone jacket (jacket cavity 22b): It also adopts hot air heating, but the hot air temperature is increased to 430-480℃. Heat transfer is enhanced by fins to control the temperature of the second-stage reaction zone to be stable at 400-450℃, which promotes the in-depth reaction and improves the fluorite powder conversion rate (≥98.5%). Compared with the traditional single temperature control, the conversion rate is increased by 1-2%.

[0060] 4. Heating coils inside the jacket cavity to assist in temperature control: Heating coils (denoted as No. 1 heating coil 20a and No. 2 heating coil 20b) are arranged on the inner walls of the No. 1 jacket cavity 22a and No. 2 jacket cavity 22b of the furnace body. The coils are made of silicon carbide and are tightly bonded to the anti-corrosion layer. The heating coils are electrically heated and serve as an auxiliary means of temperature control for jacket heating. Their core function is to compensate for the insufficient uniformity of heat transfer in the jacket and solve the problem of local temperature deviation in the furnace.

[0061] 5. Heating coil in the first reaction zone (heating coil 20a): In coordination with the hot air heating in the first jacket, when the local temperature in the furnace is below 300℃, the heating coil heats up to 360-380℃ to quickly replenish the heat; when the local temperature is above 350℃, the heating coil cools down, working in conjunction with the hot air regulation in the jacket to ensure a uniform and stable temperature in the first stage.

[0062] 6. Heating coil in the second-stage reaction zone (heating coil No. 20b): In conjunction with the hot air heating in the second-stage jacket, the temperature of the heating coil can be adjusted within the range of 410-460℃, precisely controlling the temperature of the second-stage reaction zone, avoiding local overheating that could lead to the decomposition of concentrated sulfuric acid and the generation of SO2 impurities, while also preventing the reaction from being incomplete due to excessively low temperatures.

[0063] 7. Intelligent Temperature Control Linkage System: Equipped with a PLC intelligent control system, 3-4 high-temperature and corrosion-resistant temperature sensors (made of silicon carbide) are installed in the first and second reaction zones respectively to collect furnace temperature data in real time and transmit it to the control system. The system automatically adjusts the hot air temperature and flow rate of the two jackets and the temperature of the heating coils according to the preset temperature parameters, realizing closed-loop control of "temperature acquisition-data analysis-parameter adjustment" without manual intervention, reducing operational errors. It also has an over-temperature warning function. When the furnace temperature exceeds the preset range (±5℃), the hot air supply is automatically cut off and the emergency cooling system is activated to prevent the reaction from getting out of control.

[0064] 8. Waste heat recovery structure: Waste heat recovery heat exchangers are installed at the hot air outlets of the two jackets (Hot air outlet No. 2 17 and Hot air outlet No. 1 2) to recover the waste heat (temperature 200-250℃) when the hot air is discharged. This heat is used for raw material drying (fluorite powder drying) and preheating concentrated sulfuric acid, realizing heat recycling and reducing energy consumption. Compared with the traditional horizontal rotary kiln, energy consumption can be reduced by 15-20%, which meets the requirements of energy conservation and environmental protection.

[0065] The present invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemical industry. In this embodiment, the material of the fins extending into the furnace body is the same as that of the anti-corrosion layer (silicon carbide + nano fluoride coating). The fins are inclined. When the furnace body rotates, the fins can lift and flip the material, break the material stratification, and enhance the contact between fluorite powder and concentrated sulfuric acid.

[0066] In addition, the fins can adopt a hollow structure and have openings. The fin openings are connected to the jacket cavity, allowing hot air to circulate inside the fins and improving the heating efficiency of the fins.

[0067] This invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. In this embodiment, the feeding premixer 13 includes a feeding cylinder 132 and a feeding motor 131. The feeding cylinder 132 is fixedly installed at the end of the first-stage furnace 11 and communicates with the interior of the first-stage furnace 11. The feeding motor 131 is fixedly installed on the mounting platform 14. The output shaft of the feeding motor 131 is fixedly connected to a rotating rod 138. One end of the rotating rod 138 that extends into the feeding cylinder 132 is fixedly connected to a spiral blade 135. The feeding cylinder 132 is sequentially connected to a solid phase feeding pipe 133, a liquid phase feeding pipe 134, and a gas outlet pipe 136. The solid phase feeding pipe 133 is connected to a solid phase raw material addition pipe, the liquid phase feeding pipe 134 is connected to a liquid phase raw material addition pipe, and the gas outlet pipe 136 is connected to a gas collection pipe through a three-way pipe. The other outlet of the three-way pipe can be connected to the outside to facilitate the collection of hydrogen fluoride gas and the discharge of air from the furnace.

[0068] The end of the feeding cylinder 132 is provided with an air outlet groove 137, and the air outlet pipe 136 is connected to the air outlet groove 137.

[0069] The feeding motor 131 is started, which drives the spiral blade 135 to rotate. At the same time, fluorite powder is added from the solid phase feeding pipe 133 and concentrated sulfuric acid is added from the liquid phase feeding pipe 134. The fluorite powder and concentrated sulfuric acid are mixed together in the closed space of the spiral blade 135 and are pushed by the spiral blade 135 to further mix the fluorite powder and concentrated sulfuric acid. Finally, they are pushed into the first stage furnace 11 to ensure that the raw materials are mixed evenly and to avoid side reactions caused by excessive local concentration. The hydrogen fluoride gas produced by the reaction will enter the gas outlet pipe 136 from the gas outlet trough 137 and be collected.

[0070] This invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals. In this embodiment, the drive mechanism adopts a "variable frequency motor + reduction gearbox + gear transmission" method. The variable frequency motor (drive motor 8) can achieve stepless speed adjustment (5-10 r / min). The reduction gearbox reduces the speed and increases the torque. The gear meshes with the gear ring 6 on the outer shell of the transition section furnace 7, driving the furnace body to rotate smoothly. The transmission system is equipped with an overload protection device. When the furnace body experiences material jamming or overload, the power supply is automatically cut off to prevent equipment damage.

[0071] The present invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemical industry. In this embodiment, the supporting mechanism includes a rolling ring and a support roller. The rolling ring is sleeved on the first stage furnace 9 / second stage furnace 4, and the support roller is fixedly installed on the mounting platform 14. The support roller and the rolling ring are rolled in motion.

[0072] Specifically, the two rolling rings can be referred to as front rolling ring 10 and rear rolling ring 3, and the two support rollers can be referred to as front support roller 16 and rear support roller 18. Front rolling ring 10 and rear rolling ring 3 are respectively fitted onto the outer sides of the first stage furnace 9 and the second stage furnace 4. Front support roller 16 and rear support roller 18 are respectively rolled and installed with front rolling ring 10 and rear rolling ring 3. Two front support rollers and two rear support rollers can be provided, which are respectively set on both sides of the first stage furnace 9 / second stage furnace 4.

[0073] The present invention provides a segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemical industry. In this embodiment, in order to avoid the raw material flowing too fast and failing to complete the corresponding reaction in the corresponding reaction zone, a transition section resistance step 19 is provided inside the transition section furnace 7, and a discharge resistance step 24 is provided on the inner side of the end of the two-stage furnace 4 near the tail section furnace 1.

[0074] When transferring raw materials and discharging slag, the flow rate of raw materials can be adjusted by controlling the tilt angle of the furnace body, and the raw materials and residues in each reaction zone can be transferred to the next reaction zone or the tail section furnace 1 for discharge.

[0075] Workflow

[0076] The workflow of this device is divided into eight steps: equipment commissioning, raw material preparation, inert gas replacement, raw material premixing and feeding, staged reaction, gas collection, residue discharge, and shutdown maintenance. The details are as follows:

[0077] Step 1: Equipment Debugging

[0078] Start the main power supply of the equipment and check the operating status of each component: confirm that the hydraulic telescopic rod 141 of the mounting platform 14 extends and retracts flexibly, and the initial adjustment of the furnace body tilt angle is 3°; check that the support rollers and rolling rings of the support mechanism roll smoothly without jamming; debug the drive mechanism to ensure that the frequency converter motor, gearbox and gear transmission are normal, and adjust the furnace body rotation speed to 5r / min; start the two-stage temperature control system, check that the temperature sensor, heating coil and hot air conveying system are normal, set the preset temperature of the first stage furnace 9 to 320℃, set the preset temperature of the second stage furnace 4 to 420℃, the hot air system and heating coil start normally, and the waste heat recovery heat exchanger is put into operation; check that the motor and spiral blades 135 of the feeding premixer 13 rotate normally, and that there is no blockage in the air outlet pipe 136, solid phase feeding pipe 133 and liquid phase feeding pipe 134; check that the valves of the air inlet pipe 25 and the mixture outlet 12 are well sealed and there is no leakage.

[0079] Step 2: Raw material preparation

[0080] Prepare raw materials according to a fluorite powder to concentrated sulfuric acid mass ratio of 1:1.3: fluorite powder is crushed, ground, sieved, dried, and impurity removed to ensure a particle size of 80-120 mesh, moisture content ≤0.5%, and CaF2 purity ≥97%; concentrated sulfuric acid is purified to a concentration ≥98%, removing moisture and sulfate impurities, and stored at room temperature for later use. Connect the treated fluorite powder to the solid phase feed pipe 133, and the concentrated sulfuric acid to the liquid phase feed pipe 134, checking that the raw material conveying pipes are unobstructed.

[0081] Step 3: Inert gas replacement

[0082] Connect the air inlet pipe 25 to the air pump, open the valves of the air pump and air inlet pipe 25, and introduce nitrogen (inert gas) into the furnace. Adjust the nitrogen flow rate to 5 m³ / h. Simultaneously, open the valve connecting the outlet pipe 136 to the outside, and close the gas collection valve. This allows the nitrogen to drive the air in the furnace to the feeding premixer 13, and then discharge it through the outlet pipe 136. Continue to introduce nitrogen for 30 minutes to ensure complete replacement of the air in the furnace, preventing the air from coming into contact with hydrogen fluoride gas and causing danger in subsequent reactions. After replacement, close the valve connecting the outlet pipe 136 to the outside, and continue to introduce nitrogen to maintain a slight positive pressure of 0.02-0.05 MPa inside the furnace.

[0083] Step 4: Raw material premixing and feeding

[0084] Start the feeding motor 131 of the feeding premixer 13 to drive the spiral blades 135 to rotate at a speed of 3 r / min; simultaneously open the valves of the solid phase feeding pipe 133 and the liquid phase feeding pipe 134 to control the fluorite powder feeding rate at 500 kg / h and the concentrated sulfuric acid feeding rate at 650 kg / h. The raw materials are premixed in the enclosed space of the spiral blades 135 to form a uniform paste, which is then pushed by the spiral blades 135 to the first-stage furnace 11, and then flows from the first-stage furnace 11 into the first-stage furnace 9. During the feeding process, the mixing state of the material is continuously observed to ensure that there is no clumping or stratification.

[0085] Step 5: Segmented reaction

[0086] After the raw materials enter the first-stage furnace 9, the second-stage temperature control system starts working: hot air at 380-420℃ is introduced into the first jacket cavity 22a, and the heat is transferred to the furnace through the hollow fins. The first heating coil 20a coordinates the adjustment to ensure that the temperature in the first-stage furnace 9 is stable at 300-350℃. The raw materials complete the initial metathesis reaction here, generating a small amount of hydrogen fluoride gas. The drive mechanism drives the first-stage furnace 9, the transition furnace 7, and the second-stage furnace 4 to rotate at a speed of 5r / min. The fins lift and turn the material, enhance the mixing and heat transfer of the material, and avoid incomplete local reactions.

[0087] After the initial reaction, the material flows slowly through the transition section furnace 7. The transition section barrier 19 slows down the material flow rate to ensure sufficient initial reaction. The material then enters the second-stage furnace 4. Hot air at 430-480℃ is introduced into the second jacket cavity 22b, and the second heating coil 20b coordinates the adjustment to control the temperature inside the second-stage furnace 4 to be stable at 400-450℃. The raw material undergoes a deeper metathesis reaction here, with the reaction time maintained at 2.5 hours, further improving the conversion rate of fluorite powder and generating a large amount of hydrogen fluoride gas. The discharge barrier 24 prevents the material from entering the tail section furnace 1 too quickly, ensuring a thorough deep reaction.

[0088] During the reaction, the PLC intelligent control system collects furnace temperature data in real time and automatically adjusts the hot air temperature, hot air flow rate and heating coil temperature to maintain temperature stability. At the same time, it monitors the furnace pressure. When the pressure is below 0.02MPa, it automatically increases the nitrogen flow rate, and when it is above 0.05MPa, it appropriately reduces the nitrogen flow rate to ensure stable furnace pressure.

[0089] Step 6: Gas Collection

[0090] The hydrogen fluoride gas produced by the reaction flows upward along with the nitrogen gas, enters the feeding premixer 13 through the first stage furnace 11, and enters the gas outlet pipe 136 through the gas outlet groove 137 at the end of the feeding cylinder 132. The valve connecting the gas outlet pipe 136 and the gas collection pipe is opened to introduce the hydrogen fluoride gas into the subsequent purification and distillation system for dust removal, cooling and purification treatment, and high-purity hydrogen fluoride product is collected. During the gas collection process, the gas flow rate and purity are continuously monitored to ensure the collection effect.

[0091] Step 7: Discharge of residue

[0092] After the reaction is completed, the material is transformed into solid residue (mainly gypsum). As the furnace rotates and tilts, it slowly moves to the tail furnace 1. The valve on the mixture outlet 12 is opened, and the tilt angle of the furnace is increased to 15° via the mounting platform 14, so that the solid residue in the tail furnace 1 is discharged through the mixture outlet 12 and enters the subsequent neutralization, crushing, and screening processes to achieve gypsum recycling. During the slag discharge process, nitrogen is continuously introduced to prevent air from entering the furnace. After the slag discharge is completed, the valve on the mixture outlet 12 is closed, and the tilt angle of the furnace is adjusted back to 3° to prepare for the next batch of production.

[0093] Step 8: Shutdown and Maintenance

[0094] After production is completed, first stop the raw material feeding, close the valves of solid phase feeding pipe 133 and liquid phase feeding pipe 134, and continue to run the feeding premixer 13, drive mechanism and temperature control system for 1 hour to ensure that the residual raw materials in the furnace react completely and that the residual hydrogen fluoride gas is completely discharged and collected. Then, shut down the temperature control system, drive mechanism, feeding premixer 13 and air pump, and stop the supply of nitrogen. After the furnace body cools to room temperature, open the furnace body inspection port and check the corrosion and wall slagging of the furnace inner wall, fins and heating coils. Clean up the wall slagging material in time, check the sealing performance of the seals and rotary joints, and replace damaged parts. Add lubricating oil to all moving parts. After maintenance, close the inspection port, clean and maintain the equipment, and wait for the next start-up.

[0095] In this embodiment, through the above-described workflow, the fluorite powder conversion rate reaches 98.8%, the hydrogen fluoride product purity is ≥99.9%, the energy consumption is reduced by 18% compared to traditional equipment, the continuous operation time of the equipment can reach more than 72 hours, and the maintenance frequency is reduced by 60% compared to traditional equipment, which is fully adapted to the needs of large-scale continuous industrial production.

[0096] Example 2

[0097] There are two furnace bodies, designated as Furnace No. 1 and Furnace No. 2, both mounted on mounting platform 14. A height difference exists between Furnace No. 1 and Furnace No. 2, with Furnace No. 1 positioned above Furnace No. 2. The tail section of Furnace No. 1 is equipped with a screw conveyor (existing technology, which can be modified for heat and corrosion resistance, but the structure remains unchanged, and will not be described further here). The input end of the screw conveyor is connected to the tail section of Furnace No. 1 (the air inlet pipe 25 and the mixture outlet 12 of Furnace No. 1 can be removed). The output end of the screw conveyor is connected to a guide gas box, which is mounted on the mounting platform. A screw feeder is installed on one side of the first section of Furnace No. 2. The output end of the screw feeder is connected to the first section of the furnace, and the input end of the screw feeder is connected to the bottom of the guide gas box. An exhaust pipe is located at the top of the guide gas box.

[0098] In this embodiment, Furnace No. 1 can be used as a first-stage reactor and Furnace No. 2 can be used as a second-stage reactor to achieve continuous industrial production and increase production capacity.

[0099] Specifically, the raw materials are added to Furnace No. 1 through the premixer 13. The mixed raw materials pass through Furnace No. 1 in stages 9 and 4. The raw materials are preheated in Furnace No. 1 and undergo further reaction in Furnace No. 2. The specific process is as described in Example 1. When the reaction process of the raw materials in Furnace No. 1 reaches 70%, the screw conveyor is started. The screw conveyor guides the unreacted raw materials and residues in Furnace No. 1 into the gas guide box and into the input end of the screw feeder. Then, the screw feeder feeds the raw materials and residues into Furnace No. 2 to carry out the reaction of the remaining 30% of the raw materials. The residues after the reaction are discharged from the mixed material outlet 12 on Furnace No. 2. At the same time, new raw materials can be introduced into Furnace No. 1 for a new round of reaction and production to achieve continuous production of hydrogen fluoride and increase the production capacity of hydrogen fluoride.

[0100] During this process, the gas generated in the No. 1 furnace can be discharged from the gas outlet pipe 136 at the feeding premixer 13, or it can be extracted from the gas extraction pipe on the gas guide box. The gas generated in the No. 2 furnace can be extracted from the gas extraction pipe on the gas guide box.

[0101] When performing the gas replacement step in the furnace body, inert gas can be introduced from the gas inlet pipe 25 of the No. 2 furnace, and the valve of the gas extraction pipe can be closed so that the gas can only be discharged from the gas outlet pipe 136 on the feeding premixer 13 of the No. 1 furnace. In this way, the gas in the two furnace bodies can be replaced at one time.

[0102] In addition, during the process of raw materials and residues entering the No. 2 furnace, they will briefly pass outside the furnace body, causing their temperature to drop slightly. Therefore, after the raw materials and residues enter the No. 2 furnace, they can be reheated to their reaction temperature through the first stage furnace 9 of the No. 2 furnace, and then flow into the second stage furnace 4 for complete reaction. Alternatively, the raw materials and residues can be evenly spread in the first stage furnace 9 and the second stage furnace 4, and the temperatures of the first stage furnace 9 and the second stage furnace 4 can be the same, so that all the raw materials and residues are heated to the reaction temperature together and complete reaction can be carried out. The two-stage temperature control system in the No. 2 furnace can be controlled separately according to specific circumstances and needs.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0104] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A segmented temperature-controlled two-stage solid-liquid phase reaction apparatus for fluorochemicals, comprising a mounting platform and a furnace body, characterized in that, The furnace body includes a first-stage furnace, a second-stage furnace, a transition furnace, a third-stage furnace, a fourth-stage furnace, and a two-stage temperature control system. The first-stage furnace and the fourth-stage furnace are fixedly installed on the mounting platform. The first-stage furnace is rotatably connected to the first-stage furnace, and the second-stage furnace is rotatably connected to the fourth-stage furnace. The transition furnace is fixedly connected between the first-stage furnace and the second-stage furnace. The two output terminals of the two-stage temperature control system are respectively set on the inner walls of the first-stage furnace and the second-stage furnace. The two-stage temperature control system is used to heat the inner cavities of the first-stage furnace and the second-stage furnace respectively. Two support mechanisms are installed on the mounting platform. The two support mechanisms are rotatably installed with the first stage furnace and the second stage furnace, respectively. The support mechanisms are used to support the first stage furnace, the transition section furnace and the second stage furnace. A drive mechanism is also installed on the mounting platform. The output end of the drive mechanism is connected to the transition section furnace. The drive mechanism is used to drive the transition section furnace, the first section furnace and the rear rolling ring to rotate. A feeding premixer is installed at one end of the top of the mounting platform. One end of the feeding premixer is connected to the first-stage furnace. The feeding premixer is used to premix the solid and liquid phase raw materials and transport them into the first-stage furnace, and to discharge the generated hydrogen fluoride gas.

2. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The furnace body consists of an anti-corrosion layer, an insulation layer, and an outer shell layer from the inside out. An air inlet pipe is connected to the side of the tail section furnace, and a mixed material outlet is connected to the bottom of the tail section furnace.

3. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The mounting platform includes a base, a mounting plate, and a hydraulic telescopic rod. The mounting plate is hinged to the base, the furnace body is mounted on the top of the mounting plate, and the hydraulic telescopic rod is hinged inside the base. The movable end of the hydraulic telescopic rod is hinged to the bottom of the mounting plate.

4. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The two-stage temperature control system includes two jackets, an intelligent temperature control linkage system, and a waste heat recovery structure. The two jackets are respectively installed in the inner walls of the first-stage furnace and the second-stage furnace. The jacket includes a jacket cavity, and several fins are added to the inner wall of the jacket cavity. One end of the fins extends into the furnace body. Two connecting pipes are provided on both the first-stage furnace and the second-stage furnace. One end of the connecting pipe is connected to the jacket cavity. A second hot gas inlet and a second hot gas outlet are rotatably installed on the first-stage furnace. The second hot gas inlet and the second hot gas outlet are respectively connected to the two connecting pipes on the first-stage furnace. A first hot gas inlet and a first hot gas outlet are rotatably installed on the second-stage furnace. The first hot gas inlet and the first hot gas outlet are respectively connected to the two connecting pipes on the second-stage furnace. The second hot gas inlet, the second hot gas outlet, the first hot gas inlet, and the first hot gas outlet are all fixedly installed on the mounting platform. The jacket cavity is also equipped with a heating coil; The intelligent temperature control linkage system includes a PLC intelligent control system and temperature sensors, with the temperature sensors installed in the first and second stage furnaces. The waste heat recovery structure is located at the No. 2 hot gas outlet and the No. 1 hot gas outlet.

5. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 4, characterized in that, The fins are hollow and have openings that communicate with the jacket cavity.

6. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The feeding premixer includes a feeding cylinder and a feeding motor. The feeding cylinder is fixedly installed at the end of the first section furnace and communicates with the interior of the first section furnace. The feeding motor is fixedly installed on the mounting platform. The output shaft of the feeding motor is fixedly connected to a rotating rod. One end of the rotating rod that extends into the feeding cylinder is fixedly connected to a spiral blade. The feeding cylinder is sequentially connected to a solid phase feeding pipe, a liquid phase feeding pipe, and an exhaust pipe. The end of the feeding cylinder is provided with an air outlet groove, and the air outlet pipe is connected to the air outlet groove.

7. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The drive mechanism includes a drive motor, a gear, a gear ring, and a reducer. The drive motor is mounted on a mounting platform and is connected to the gear through the reducer. The gear ring is fitted onto the outer shell of the transition section furnace, and the gear meshes with the gear ring on the outer shell of the transition section furnace.

8. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The supporting mechanism includes a rolling ring and a support roller. The rolling ring is fitted onto the first-stage furnace / second-stage furnace, and the support roller is fixedly installed on the mounting platform. The support roller and the rolling ring are installed in a rolling motion.

9. The segmented temperature-controlled two-stage solid-liquid phase reaction device for fluorochemicals according to claim 1, characterized in that, The transition section furnace is equipped with a transition section resistance step inside, and the second section furnace is equipped with a discharge resistance step on the inner side of the end near the tail section furnace.

10. The segmented temperature-controlled two-stage solid-liquid phase reaction apparatus for fluorochemicals according to any one of claims 1-9, characterized in that, There are two furnace bodies, referred to as Furnace No. 1 and Furnace No. 2, both of which are installed on the mounting platform. Furnace No. 1 is located above Furnace No.

2. The tail section of Furnace No. 1 is equipped with a screw feeder, the output end of which is connected to a gas guide box. The first section of Furnace No. 2 is equipped with a screw feeder on one side, the input end of which is connected to the bottom of the gas guide box. The top of the gas guide box is equipped with an exhaust pipe.

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