Preparation device and preparation method of high-thermal-conductivity nitro-type molten salt

Abstract

The invention provides a preparation device and a preparation method of high-thermal-conductivity nitro-type molten salt, and the preparation device of the high-thermal-conductivity nitro-type molten salt comprises a grinding chamber, a granulation chamber, a powder filtering chamber and a cyclone separator. The bottom of the grinding chamber is connected with a cyclone separator through a first material guide auger, a granulation chamber is arranged at the top of the grinding chamber, and a powder filtering chamber is arranged above the granulation chamber. By effectively combining the working procedures of grinding, pelleting, powder quality screening and separating, pelleting waste and grinding waste returning and grinding and the like, the machining structure is compact, the dust raising problem is not prone to occurring during material transferring between the working procedures, the workshop environment is effectively protected, and material waste is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of preparing high thermal conductivity nitro-type molten salt, and in particular to a preparation device and a preparation method of high thermal conductivity nitro-type molten salt. Background Art

[0002] Molten salt has become a potential heat transfer and heat storage medium in solar thermal power generation technology due to its wide range of operating temperature, low vapor pressure, low viscosity, good stability, low cost and many other characteristics. It has become a widely used and mature heat transfer and heat storage medium. Application number CN201310731908.5 discloses a high-temperature molten salt preparation device and method, including a mobile electric heating, a molten salt tank with an interlayer, an airflow crushing dryer, a hot air generator, a granulating device, a cooling device, a stirring device, and a feed port. In the device, the molten salt mixed system directly forms a dry and uniform powder after passing through the airflow crushing dryer, and the powdered molten salt obtained from the airflow dryer enters the granulator. Among them, the grinding, screening and granulation processes are carried out independently, that is, independent equipment is required for processing, so that the entire industrial chain of the preparation of the molten salt product is not continuous enough, and the transmission equipment is required between the processes for transmission and processing. The molten salt product in the powder state is prone to dust problems, causing workshop pollution and material waste. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a preparation device and a preparation method of high thermal conductivity nitro-type molten salt to more accurately solve the above problems.

[0004] The present invention is achieved through the following technical solutions: The present invention proposes a preparation device for high thermal conductivity nitro-type molten salt, comprising a grinding chamber, a granulation chamber, a powder filtration chamber and a cyclone separator, wherein the bottom of the grinding chamber is a conical bottom, and a grinding rotor is matched in the conical bottom of the grinding chamber, a grinding motor is provided at the bottom of the grinding chamber, and the output shaft of the grinding motor is transmission-connected to the bottom of the grinding rotor, a feed hopper is provided on one side of the upper part of the grinding chamber, a first material guide dragon is provided at the bottom of the grinding chamber and extends obliquely upward, and the upper end of the first material guide dragon is connected to the feed interface of the cyclone separator, a granulation chamber is provided at the top of the grinding chamber, a pair of granulation rollers are provided inside the granulation chamber, and a granulation roller drive is provided on the outer wall of the granulation chamber. The motor is integrated, and the output shaft of the granulation roller driving motor is transmission-connected to one shaft end of the granulation roller; a molten salt particle discharge slot is provided on one side of the bottom of the granulation chamber, and a discharge guide plate is provided at the outer port of the molten salt particle discharge slot, and an obliquely arranged particle filter screen is provided at the inner port close to the molten salt particle discharge slot; a powder filter chamber is provided above the granulation chamber, and the top of the powder filter chamber is an exhaust chamber, and several exhaust ports are provided at the bottom of the inner cavity of the exhaust chamber, and an exhaust interface is provided on the top of the exhaust chamber, and the exhaust interface is connected to an exhaust pump; a powder air inlet interface is provided on the side of the powder filter chamber close to the cyclone separator, and the powder air inlet interface is connected to the upper exhaust port on the top of the cyclone separator through an air duct.

[0005] Furthermore, a second grinding lining is embedded in the inner wall of the conical bottom of the grinding chamber, and a first grinding lining is mounted on the outer wall of the grinding core.

[0006] Furthermore, it is characterized in that a material distribution cover is provided on the top of the grinding rotor, and the material distribution cover is an umbrella-shaped cover body, and a plurality of obliquely guided material distribution guide strips are integrally formed on the upper surface of the material distribution cover, and the plurality of material distribution guide strips are arranged in a circular array along the axis of the material distribution cover.

[0007] Furthermore, a driven bevel gear is provided at the lower shaft end of the dragon roller core inside the first material guiding dragon, a driving gear is provided at the middle of the output shaft of the grinding motor, and the driving gear is meshed with the driven bevel gear for transmission.

[0008] Furthermore, a first vibrator is provided at the bottom of the particle filter plate away from the molten salt particle discharge slot. The first vibrator is fixed on the inner wall of the granulation chamber, and the vibrating end of the first vibrator is connected to the upper end of the particle filter plate. The lower end of the particle filter plate is hinged to the inner wall of the granulation chamber through a pin.

[0009] Furthermore, a pair of powder guide plates are provided at the bottom of the inner cavity of the powder filter chamber, and the pair of powder guide plates are symmetrically arranged in a "V" shape. The lower ends of the powder guide plates are hinged to the inner walls of the powder filter chamber through pins, and second vibrators are provided below the upper ends of the two powder guide plates. The second vibrators are fixed on the inner side walls of the powder filter chamber, and the vibration ends of the second vibrators are connected to the upper ends of the powder guide plates.

[0010] Furthermore, the filter bag is supported by a bag frame, a rotating cylinder seat is connected to the top of the bag frame, the rotating cylinder seat and the bottom of the vacuum chamber are rotated through an airtight bearing, and a turbofan is provided inside the rotating cylinder seat.

[0011] Furthermore, the bottom discharge port of the cyclone separator is connected to a powder collecting box, and the powder collecting box is connected to a second material guiding dragon extending to the back of the grinding chamber. A lifting motor is provided on the powder collecting box, and the output shaft end of the lifting motor is drivingly connected to the shaft end of the dragon roller core of the second material guiding dragon. The upper end of the second material guiding dragon is connected to a blanking box, and the bottom of the blanking box is communicated with the inner cavity of the grinding chamber through a blanking pipe.

[0012] A method for preparing a device for preparing a high thermal conductivity nitro-type molten salt comprises the following steps: Step 1: Grinding: The molten salt raw materials are introduced into the grinding chamber along the feed hopper, and the grinding motor drives the grinding core to grind the introduced molten salt raw materials into powder. When feeding, the material sparging cover rotates with the grinding core, and guides the molten salt raw materials to the outer circle of the inner cavity of the grinding chamber through a number of material sparging guide bars on the upper surface, so that the molten salt raw materials enter the grinding position of the grinding core faster and more evenly; Step 2: Powder quality separation: The molten salt powder ground in the grinding chamber is guided to the cyclone separator through the first material guide dragon, and the molten salt powder that meets the granulation specifications is separated from the molten salt particles that are not completely ground in the powder through the cyclone separator. The qualified molten salt powder is introduced into the powder filter chamber through the air guide pipe connected to the upper exhaust port, and the molten salt powder is isolated and dropped under the exhaust action of the exhaust pump and the filter screen; The incompletely ground molten salt particles are lifted into the blanking box by the driving of the lifting motor on the roller core in the second material guiding dragon, and are reintroduced into the grinding chamber through the blanking pipe at the bottom of the blanking box for return grinding. Step 3: Granulation: The molten salt powder dropped from the filter screen is guided between a pair of granulation rollers through a vibrating powder guide plate, and the granulation roller drive motor integrates the pair of granulation rollers to roll and granulate the molten salt powder introduced by the powder guide plate; The molten salt particles formed by the granulation roller fall onto the particle filter plate, and the scraps in the granulation process fall back into the grinding chamber through the sieve holes on the particle filter plate and are re-ground into powder. Under the vibration of the particle filter plate by the first vibrator, the roller-pressed scraps remaining on the molten salt particles are separated, and the formed molten salt particles are finally discharged along the discharge guide plate.

[0013] Beneficial effects of the present invention: 1. The present invention introduces the molten salt raw material into the grinding chamber along the feed hopper, and the grinding motor drives the grinding core to grind the introduced molten salt raw material into powder. At the same time, when the molten salt raw material is fed, the material sparging cover guides the molten salt raw material to the inner cavity outer ring position of the grinding chamber through a plurality of material sparging guide bars on the upper surface as the grinding core rotates, so that the molten salt raw material enters the grinding position of the grinding core faster and more evenly, thereby improving the grinding efficiency; 2. The present invention guides the molten salt powder ground in the grinding chamber to the cyclone separator through the first material guide dragon, and separates the molten salt powder that meets the granulation specifications from the molten salt particles that are not completely ground in the powder through the cyclone separator. The molten salt particles that are not completely ground are lifted to the blanking box under the driving of the dragon roller core in the second material guide dragon by the lifting motor, and are re-introduced into the grinding chamber through the blanking pipe at the bottom of the blanking box for return grinding to ensure the grinding quality; 3. In the present invention, the molten salt particles formed by the granulation roller fall onto the particle filter plate, and the scraps in the granulation process fall back into the grinding chamber through the sieve holes on the particle filter plate and are re-ground into powder for re-grinding and reuse of the granulation waste. Under the vibration of the particle filter plate by the first vibrator, the roller scraps remaining on the molten salt particles can be effectively separated, which is conducive to the scraps passing through the sieve holes of the particle filter plate. 4. The present invention introduces qualified molten salt powder separated by cyclone separator into the powder filter chamber, and isolates and drops the molten salt powder under the exhaust action of the exhaust pump and the filter screen. The dropped powder is guided between a pair of granulation rollers by a vibrating powder guide plate for roller granulation. It is worth mentioning that during the exhaust process of the exhaust pump, the airflow passes through the interior of the rotating cylinder seat at the upper end, and the airflow drives the entire rotation when passing through the turbofan, thereby effectively throwing off the molten salt powder on the filter screen of the outer wall of the filter bag, improving the powder dropping efficiency, and preventing the filter bag from affecting its filtering effect due to an excessively thick powder layer; 5. The present invention effectively combines the processes of grinding, granulation, powder quality screening and separation, and re-grinding of granulation waste and grinding waste. The processing structure is compact and the material transportation between processes is not prone to dust problems, which effectively protects the workshop environment and avoids material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial cross-sectional view of the three-dimensional structure of the present invention; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 A back view of the three-dimensional structure of the present invention; Figure 4 It is a partial view of the three-dimensional structure of the granulation chamber and the powder filtering chamber in the present invention; Figure 5 for Figure 4 The enlarged view of point B in the middle; Figure 6 It is a front cross-sectional view of the structure of the present invention.

[0015] In the figure: 1. Grinding chamber; 101. Feed hopper; 102. Grinding core; 1021. First grinding lining; 1022. Second grinding lining; 103. Grinding motor; 1031. Driving gear; 104. Material sparging cover; 1041. Material sparging guide bar; 105. First material guide dragon; 1051. Driven bevel gear; 2. Granulation chamber; 201. Granulation roller; 202. Discharge guide plate; 203. Particle filter screen plate; 204. First vibrator; 3. Powder filtration chamber; 301. Powder air inlet interface; 302, exhaust chamber; 303,; 3031, filter bag; 3032, bag frame; 3033, rotating cylinder seat; 3034, airtight bearing; 3035, turbofan; 304, exhaust pump; 305, powder guide plate; 306, second vibrator; 4, cyclone separator; 401, upper air outlet; 402, air guide duct; 403, powder collecting box; 404, second material guiding dragon; 4041, lifting motor; 405, material dropping box; 406, material dropping pipe. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0017] Preparation device of high thermal conductivity nitro molten salt, combined with Figure 1 and Figure 6 As shown, a feed hopper 101 is provided on one side of the upper part of the grinding chamber 1, which is used to introduce the molten salt raw material into the inner cavity of the grinding chamber 1. The bottom of the grinding chamber 1 is a conical bottom, and a grinding core 102 is matched in the conical bottom of the grinding chamber 1. A grinding motor 103 is provided at the bottom of the grinding chamber 1, and the output shaft of the grinding motor 103 is transmission-connected to the bottom of the grinding core 102. The grinding motor 103 drives the grinding core 102 to grind the introduced molten salt raw material into powder. A second grinding lining 1022 is embedded in the inner wall of the conical bottom of the grinding chamber 1, and the outer wall of the grinding core 102 is equipped with a first grinding lining 1021, so that the grinding surface of the grinding structure can be replaced, thereby reducing the repair and maintenance cost.

[0018] It is worth mentioning that a material leveling cover 104 is provided on the top of the grinding rotor 102. The material leveling cover 104 is an umbrella-shaped cover body. A plurality of obliquely guided material leveling guide strips 1041 are integrally formed on the upper surface of the material leveling cover 104. The plurality of material leveling guide strips 1041 are arranged in a circular array along the axis of the material leveling cover 104. When the molten salt raw material is fed, the material leveling cover 104 guides the molten salt raw material to the outer circle position of the inner cavity of the grinding chamber 1 through the plurality of material leveling guide strips 1041 on the upper surface as the grinding rotor 102 rotates, so that the molten salt raw material enters the grinding position of the grinding rotor 102 faster and more evenly.

[0019] The technical solution in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: the present invention introduces the molten salt raw material into the grinding chamber 1 along the feed hopper 101, and the grinding motor 103 drives the grinding core 102 to grind the introduced molten salt raw material into powder. At the same time, when the molten salt raw material is fed, the material leveling cover 104 rotates with the grinding core 102, and guides the molten salt raw material to the outer circle position of the inner cavity of the grinding chamber 1 through a plurality of material leveling guide bars 1041 on the upper surface, so that the molten salt raw material enters the grinding position of the grinding core 102 faster and more evenly, thereby improving the grinding efficiency. Example 2

[0020] Combination Figure 1 , Figure 2 and Figure 6 As shown, a first material guiding dragon 105 extending obliquely upward is provided at the bottom of the grinding chamber 1, and the upper end of the first material guiding dragon 105 is connected to the feeding interface of the cyclone separator 4, the bottom discharge port of the cyclone separator 4 is connected to a powder collecting box 403, the powder collecting box 403 is connected to a second material guiding dragon 404 extending to the back of the grinding chamber 1, a lifting motor 4041 is provided on the powder collecting box 403, and the output shaft end of the lifting motor 4041 is drivingly connected to the shaft end of the dragon roller core of the second material guiding dragon 404, the upper end of the second material guiding dragon 404 is connected to a blanking box 405, and the bottom of the blanking box 405 is communicated with the inner cavity of the grinding chamber 1 through a blanking pipe 406. The molten salt powder after grinding in the grinding chamber 1 is guided to the cyclone separator 4 through the first material guiding dragon 105, and the molten salt powder meeting the granulation specifications is separated from the molten salt particles that are not completely ground in the powder by the cyclone separator 4. The molten salt particles that are not completely ground are lifted to the blanking box 405 by the driving of the dragon roller core in the second material guiding dragon 404 by the lifting motor 4041, and are reintroduced into the grinding chamber 1 through the blanking pipe 406 at the bottom of the blanking box 405 for return grinding to ensure the grinding quality.

[0021] It is worth mentioning that a driven bevel gear 1051 is provided at the lower shaft end of the dragon roller core inside the first material guide dragon 105, a driving gear 1031 is provided in the middle of the output shaft of the grinding motor 103, and the driving gear 1031 is meshed with the driven bevel gear 1051 for transmission, thereby reducing the setting of the power source and making the structure more compact.

[0022] The technical scheme in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: the present invention guides the molten salt powder ground in the grinding chamber 1 to the cyclone separator 4 through the first material guide dragon 105, and separates the molten salt powder that meets the granulation specifications from the molten salt particles that are not completely ground in the powder through the cyclone separator 4. The incompletely ground molten salt particles are lifted to the blanking box 405 under the driving of the dragon roller core in the second material guide dragon 404 by the lifting motor 4041, and are re-introduced into the grinding chamber 1 through the blanking pipe 406 at the bottom of the blanking box 405 for return grinding to ensure the grinding quality. Example 3

[0023] Combination Figure 4 and Figure 6 As shown, a granulation chamber 2 is provided on the top of the grinding chamber 1, a pair of granulation rollers 201 are provided inside the granulation chamber 2, a granulation roller drive motor integration is provided on the outer wall of the granulation chamber 2, and the output shaft of the granulation roller drive motor integration is transmission-connected with one shaft end of the granulation roller 201, and under the drive of the granulation roller drive motor integration to the pair of granulation rollers 201, molten salt powder is introduced between the pair of granulation rollers 201, and the molten salt powder is rolled and granulated by the pair of granulation rollers 201, and the granulation is performed. A molten salt particle discharge slot is provided on one side of the bottom of the chamber 2, and a discharge guide plate 202 is provided at the outer port of the molten salt particle discharge slot, and an obliquely arranged particle filter screen plate 203 is provided close to the inner port of the molten salt particle discharge slot. The molten salt particles formed by the granulation roller 201 fall onto the particle filter screen plate 203, and the scraps during the granulation process fall back into the grinding chamber 1 through the sieve holes on the particle filter screen plate 203 to be re-ground into powder for re-grinding and reuse of granulation waste.

[0024] It is worth mentioning that a first vibrator 204 is provided at the bottom of the particle filter screen plate 203 away from the molten salt particle discharge slot, the first vibrator 204 is fixed to the inner wall of the granulation chamber 2, and the vibrating end of the first vibrator 204 is connected to the upper end of the particle filter screen plate 203, and the lower end of the particle filter screen plate 203 is hinged to the inner wall of the granulation chamber 2 through a pin. Under the vibration of the first vibrator 204 on the particle filter screen plate 203, the rolling scraps remaining on the molten salt particles can be effectively separated, and the scraps are conducive to passing through the sieve holes of the particle filter screen plate 203.

[0025] The technical scheme in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: in the present invention, the molten salt particles formed by the granulation roller 201 fall onto the particle filter screen plate 203, and the scraps during the granulation process fall back into the grinding chamber 1 through the sieve holes on the particle filter screen plate 203 and are re-ground into powder, which is used for the re-grinding and reuse of granulation waste, and under the vibration action of the first vibrator 204 on the particle filter screen plate 203, the rolled scraps remaining on the molten salt particles can be effectively separated, which is conducive to the scraps passing through the sieve holes of the particle filter screen plate 203. Example 4

[0026] Combination Figure 1 and Figure 3 As shown, a powder filter chamber 3 is provided above the granulation chamber 2, and the top of the powder filter chamber 3 is an air extraction chamber 302. The bottom of the inner cavity of the air extraction chamber 302 is provided with a plurality of 303. The top of the air extraction chamber 302 is provided with an exhaust interface, and the exhaust interface is connected to an exhaust pump 304. A powder air inlet interface 301 is provided on the side of the powder filter chamber 3 close to the cyclone separator 4, and the powder air inlet interface 301 is connected to the upper exhaust port 401 on the top of the cyclone separator 4 through an air guide pipe 402. The qualified molten salt powder screened and separated by the cyclone separator 4 is introduced into the powder filter chamber 3, and the molten salt powder is isolated and dropped under the exhaust action of the exhaust pump 304 and the filter screen 303. A pair of powder guide plates 305 are provided at the bottom of the inner cavity of the powder filter chamber 3, and the pair of powder guide plates 305 are symmetrically arranged in a "V" shape, which are used to guide the molten salt powder isolated and dropped by 303 into between a pair of granulation rollers 201.

[0027] It is worth mentioning that the lower end of the powder guide plate 305 is hinged to the inner wall of the powder filter chamber 3 through a pin, and a second vibrator 306 is provided below the upper ends of the two powder guide plates 305. The second vibrator 306 is fixed on the inner wall of the powder filter chamber 3, and the vibrating end of the second vibrator 306 is connected to the upper end of the powder guide plate 305. Through the vibration action of the second vibrator 306 on the powder guide plate 305, the powder on the powder guide plate 305 can be quickly guided to a pair of granulation rollers 201.

[0028] Combination Figure 4 and Figure 5As shown, 303 includes a filter bag 3031 supported by a bag frame 3032, a rotating cylinder seat 3033 is connected to the top of the bag frame 3032, the rotating cylinder seat 3033 and the cavity bottom of the air extraction chamber 302 are rotated in cooperation through an airtight bearing 3034, and a turbofan 3035 is arranged inside the rotating cylinder seat 3033. During the exhaust process of the exhaust pump 304, the airflow passes through the rotating cylinder seat 3033, and the entire 303 is driven to rotate when the airflow passes through the turbofan 3035, so as to effectively throw off the molten salt powder filtered on the outer wall of the filter bag 3031, improve the powder falling efficiency, and prevent the filter bag 3031 from affecting its filtering effect due to an excessively thick powder layer.

[0029] The technical scheme in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: the present invention introduces the qualified molten salt powder screened and separated by the cyclone separator 4 into the powder filter chamber 3, and under the exhaust action of the exhaust pump 304 and the filter screen of 303, the molten salt powder is isolated and dropped, and the dropped powder is guided between a pair of granulation rollers 201 through the vibrating powder guide plate 305 for roller granulation. It is worth mentioning that during the exhaust process of the exhaust pump 304, the airflow passes through the rotating cylinder seat 3033 at the upper end of 303, and the airflow drives the entire 303 to rotate when passing through the turbofan 3035, thereby effectively throwing off the molten salt powder on the filter screen of the outer wall of the filter bag 3031, improving the powder dropping efficiency, and at the same time avoiding the filter bag 3031 from affecting its filtering effect due to the excessively thick powder layer.

[0030] A method for preparing a high thermal conductivity nitro-type molten salt preparation device comprises the following steps: Step 1: Grinding: The molten salt raw material is introduced into the grinding chamber 1 along the feed hopper 101, and the grinding motor 103 drives the grinding core 102 to grind the introduced molten salt raw material into powder. During feeding, the material-splitting cover 104 guides the molten salt raw material to the outer ring position of the inner cavity of the grinding chamber 1 through a plurality of material-splitting guide strips 1041 on the upper surface as the grinding core 102 rotates, so that the molten salt raw material enters the grinding position of the grinding core 102 faster and more evenly; Step 2: Powder quality separation: The molten salt powder ground in the grinding chamber 1 is guided to the cyclone separator 4 through the first material guide dragon 105, and the molten salt powder that meets the granulation specifications is separated from the molten salt particles that are not completely ground in the powder through the cyclone separator 4, and the qualified molten salt powder is introduced into the powder filter chamber 3 through the air guide pipe 402 connected to the upper exhaust port 401, and the molten salt powder is isolated and dropped under the exhaust action of the exhaust pump 304 and the filter screen 303; The incompletely ground molten salt particles are driven by the lifting motor 4041 on the dragon roller core in the second material guiding dragon 404, and are lifted into the blanking box 405, and are re-introduced into the grinding chamber 1 through the blanking pipe 406 at the bottom of the blanking box 405 for return grinding; Step 3: Granulation: The molten salt powder falling through the filter screen 303 is guided between a pair of granulation rollers 201 through a vibrating powder guide plate 305, and the granulation roller drive motor integrated drives the pair of granulation rollers 201, and the molten salt powder introduced by the powder guide plate 305 is rolled and granulated by the pair of granulation rollers 201; The molten salt particles formed by the granulation roller 201 fall onto the particle filter screen plate 203, and the scraps during the granulation process fall back into the grinding chamber 1 through the sieve holes on the particle filter screen plate 203 to be re-ground into powder, and under the vibration of the particle filter screen plate 203 by the first vibrator 204, the rolling scraps remaining on the molten salt particles are separated, and the formed molten salt particles are finally discharged along the discharge guide plate 202.

[0031] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A device for preparing high thermal conductivity nitro-type molten salt, comprising a grinding chamber (1), a granulation chamber (2), a powder filtering chamber (3) and a cyclone separator (4), characterized in that: The bottom of the grinding chamber (1) is a conical bottom, and a grinding core (102) is matched in the conical bottom of the grinding chamber (1). A grinding motor (103) is provided at the bottom of the grinding chamber (1), and the output shaft of the grinding motor (103) is drivingly connected to the bottom of the grinding core (102). A feed hopper (101) is provided on one side of the upper part of the grinding chamber (1). A first material guide dragon (105) extending obliquely upward is provided at the bottom of the grinding chamber (1), and the upper end of the first material guide dragon (105) is connected to the feed interface of the cyclone separator (4). A granulation chamber (2) is provided at the top of the grinding chamber (1), and a pair of granulation rollers (201) are provided inside the granulation chamber (2). A granulation roller drive motor integration is provided on the outer wall of the granulation chamber (2), and the output shaft of the granulation roller drive motor integration is connected to the granulation roller (201). 01), a molten salt particle discharge slot is provided on one side of the bottom of the granulation chamber (2), and a discharge guide plate (202) is provided at the outer end of the molten salt particle discharge slot, and a particle filter screen plate (203) is provided in an oblique direction close to the inner end of the molten salt particle discharge slot, a powder filter chamber (3) is provided above the granulation chamber (2), the top of the powder filter chamber (3) is an exhaust chamber (302), the bottom of the inner cavity of the exhaust chamber (302) is provided with a plurality of (303), the top of the exhaust chamber (302) is provided with an exhaust interface, and the exhaust interface is connected to an exhaust pump (304), and a powder air inlet interface (301) is provided on the side of the powder filter chamber (3) close to the cyclone separator (4), and the powder air inlet interface (301) is connected to the upper exhaust port (401) at the top of the cyclone separator (4) through an air guide pipe (402).

2. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: A second grinding lining (1022) is embedded in the inner wall of the conical bottom of the grinding chamber (1), and a first grinding lining (1021) is mounted on the outer wall of the grinding core (102).

3. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: A material distribution cover (104) is provided on the top of the grinding rotor (102). The material distribution cover (104) is an umbrella-shaped cover body. A plurality of obliquely directed material distribution guide strips (1041) are integrally formed on the upper surface of the material distribution cover (104). The plurality of material distribution guide strips (1041) are arranged in a ring array along the axis of the material distribution cover (104).

4. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: A driven bevel gear (1051) is provided at the lower shaft end of the dragon roller core inside the first material guiding dragon (105), a driving gear (1031) is provided at the middle of the output shaft of the grinding motor (103), and the driving gear (1031) is meshed with the driven bevel gear (1051) for transmission.

5. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: A first vibrator (204) is provided at the bottom of the particle filter plate (203) on the side away from the molten salt particle discharge slot, the first vibrator (204) is fixed to the inner wall of the granulation chamber (2), and the vibrating end of the first vibrator (204) is connected to the upper end of the particle filter plate (203), and the lower end of the particle filter plate (203) is hinged to the inner wall of the granulation chamber (2) via a pin.

6. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: A pair of powder guide plates (305) are provided at the bottom of the inner cavity of the powder filter chamber (3). The pair of powder guide plates (305) are symmetrically arranged in a "V" shape. The lower ends of the powder guide plates (305) are hinged to the inner wall of the powder filter chamber (3) through pins. A second vibrator (306) is provided below the upper ends of the two powder guide plates (305). The second vibrator (306) is fixed to the inner wall of the powder filter chamber (3), and the vibrating end of the second vibrator (306) is connected to the upper end of the powder guide plate (305).

7. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: The (303) comprises a filter bag (3031) supported by a bag frame (3032); a rotating cylinder seat (3033) is connected to the top of the bag frame (3032); the rotating cylinder seat (3033) and the bottom of the air extraction chamber (302) rotate in cooperation via an airtight bearing (3034); and a turbofan (3035) is provided inside the rotating cylinder seat (3033).

8. The device for preparing high thermal conductivity nitro-type molten salt according to claim 1, characterized in that: The bottom discharge port of the cyclone separator (4) is connected to a powder collecting box (403), and the powder collecting box (403) is connected to a second material guiding dragon (404) extending to the back of the grinding chamber (1). A material lifting motor (4041) is provided on the powder collecting box (403), and the output shaft end of the material lifting motor (4041) is drivingly connected to the shaft end of the dragon roller core of the second material guiding dragon (404). The upper end of the second material guiding dragon (404) is connected to a blanking box (405), and the bottom of the blanking box (405) is connected to the inner cavity of the grinding chamber (1) through a blanking pipe (406).

9. A method for preparing a high thermal conductivity nitro-type molten salt preparation device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Grinding: The molten salt raw material is introduced into the grinding chamber (1) along the feed hopper (101), and the grinding motor (103) drives the grinding core (102) to grind the introduced molten salt raw material into powder. When feeding, the material-splitting cover (104) guides the molten salt raw material to the outer ring position of the inner cavity of the grinding chamber (1) through a plurality of material-splitting guide bars (1041) on the upper surface as the grinding core (102) rotates, so that the molten salt raw material enters the grinding position of the grinding core (102) more quickly and evenly; Step 2: Powder mass separation: The molten salt powder ground in the grinding chamber (1) is guided to the cyclone separator (4) through the first material guide dragon (105), and the molten salt powder that meets the granulation specifications is separated from the molten salt particles that are not completely ground in the powder through the cyclone separator (4), and the qualified molten salt powder is introduced into the powder filter chamber (3) through the air guide pipe (402) connected to the upper exhaust port (401), and the molten salt powder is isolated and dropped under the exhaust action of the exhaust pump (304) and the filter screen (303); The incompletely ground molten salt particles are lifted into the material drop box (405) under the driving of the material lifting motor (4041) on the dragon roller core in the second material guide dragon (404), and are reintroduced into the grinding chamber (1) through the material drop pipe (406) at the bottom of the material drop box (405) for return grinding; Step 3: Granulation: The molten salt powder falling through the filter screen (303) is guided to between a pair of granulation rollers (201) through a vibrating powder guide plate (305), and the granulation roller drive motor integrated with the pair of granulation rollers (201) drives the molten salt powder introduced by the powder guide plate (305) to be rolled and granulated by the pair of granulation rollers (201); The molten salt particles formed by the granulation roller (201) fall onto the particle filter screen plate (203), and the scraps during the granulation process fall back into the grinding chamber (1) through the sieve holes on the particle filter screen plate (203) to be re-ground into powder, and under the vibration of the particle filter screen plate (203) by the first vibrator (204), the rolling scraps remaining on the molten salt particles are separated, and the formed molten salt particles are finally discharged along the discharge guide plate (202).

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