A powder removal and hydrogen removal system and method for silicon material production

Abstract

The present invention discloses a powder removal and hydrogen removal system and method for silicon material production, including a water washing and material distribution device, a preheating device, a heating device, a cooling device and an anti-oxidation device, wherein the water washing and material distribution device is connected to the input end of the preheating device, the output end of the preheating device is lower than the input end of the preheating device and is connected to the input end of the heating device, the output end of the heating device is lower than the input end of the heating device and is connected to the input end of the cooling device, and the output end of the cooling device is lower than the input end of the cooling device and is connected to the anti-oxidation device. The fine powder in the silicon material is washed, dried and dehydrogenated, and the collision between silicon materials can be effectively avoided during the entire production process, and the generation of fine powder or micro powder can be prevented again, and the fine powder or micro powder in the silicon material can be effectively avoided from polluting the air, and the silicon material can also be prevented from being oxidized.

Description

Technical Field

[0001] The present invention relates to the technical field of silicon material production, and in particular to a system and method for removing powder and hydrogen for silicon material production. Background Art

[0002] At present, the production of polysilicon and monocrystalline silicon in China will adopt the crushing process, but after the crushing production process, there will be a certain proportion of small particles, which will be mixed with a lot of fine powder. In order to further utilize this part of small particles, it is necessary to remove the fine powder in the small particles. In addition, the granular silicon produced by the silane fluidized bed method will also produce a large amount of fine powder. At present, dust extraction and screening can be used to remove this part of fine powder in silicon materials. Since screening requires the silicon material to vibrate, the vibration and collision between the screen plate and the silicon material will grind out a large amount of fine powder again. Therefore, not only the fine powder in the silicon material is not completely removed, but also the silicon material is further lost. The vibration screening and dust extraction method cannot completely prevent the silicon material from being scattered into the air, which not only affects the environment, but also causes great harm to the human body. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a system and method for removing powder and hydrogen for silicon material production.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A powder removal and hydrogen removal system for silicon material production, comprising a water washing and material distribution device, a preheating device, a heating device, a cooling device and an anti-oxidation device, wherein the water washing and material distribution device is connected to the input end of the preheating device, the output end of the preheating device is lower than the input end of the preheating device and is connected to the input end of the heating device, the output end of the heating device is lower than the input end of the heating device and is connected to the input end of the cooling device, and the output end of the cooling device is lower than the input end of the cooling device and is connected to the anti-oxidation device;

[0006] The water washing and distributing device comprises a first support frame, a spiral conveying and screening assembly, a spray assembly, a first driving motor and a recovery and filtering assembly. The two ends of the spiral conveying and screening assembly are respectively rotatably arranged on the first support frame through first limit rollers. The first driving motor is fixedly arranged on the first support frame and used to drive the spiral conveying and screening assembly to rotate. The spray assembly is fixedly arranged on the first support frame and used to spray the silicon material inside the spiral conveying and screening assembly. The recovery and filtering assembly is fixedly arranged directly below the spiral conveying and screening assembly and cooperates with the spiral conveying and screening assembly. The output end of the spiral conveying and screening assembly cooperates with the input end of the preheating device.

[0007] The spiral conveying and screening assembly includes a drum, a screening mesh and a spiral plate. The spiral plate is sealed and fixedly arranged on the inner wall of the drum. The two ends of the spiral plate are respectively flush with the two ends of the drum. A plurality of screening holes are arranged on the drum. The screening holes cooperate with the spiral gap formed between the spiral plates. The screening mesh is arranged on the inner wall of the drum, and the screening mesh cooperates with the screening holes.

[0008] Furthermore, the drum is provided with a primary flushing section, a secondary flushing section and a tertiary flushing section, the secondary flushing section is provided between the primary flushing section and the tertiary flushing section, and the tertiary flushing section is provided at the output end side of the drum.

[0009] Furthermore, the spray assembly includes a tertiary cleaning pipe, a secondary cleaning pipe, a primary cleaning pipe and a nozzle, the tertiary cleaning pipe, the secondary cleaning pipe and the primary cleaning pipe are all fixedly arranged on the first supporting frame, the output ends of the tertiary cleaning pipe, the secondary cleaning pipe and the primary cleaning pipe are all arranged in the drum, the output end of the tertiary cleaning pipe is provided with the nozzle cooperating with the tertiary flushing section, the output end of the secondary cleaning pipe is provided with the nozzle cooperating with the secondary flushing section, the output end of the primary cleaning pipe is provided with the nozzle cooperating with the primary flushing section, the input end of the tertiary cleaning pipe is connected to a water source, and the input ends of the secondary cleaning pipe and the primary cleaning pipe are both connected to the recovery and filtering assembly.

[0010] Further, the recovery and filtering assembly includes a primary flushing tank, a secondary flushing tank, a tertiary flushing tank, a recovery tank and a filter screen, the primary flushing tank cooperates with the primary flushing section, the secondary flushing tank cooperates with the secondary flushing section, and the tertiary flushing tank cooperates with the tertiary flushing section, the two sides of the secondary flushing tank are respectively sealed and connected with the primary flushing tank and the tertiary flushing tank, the upper end of the secondary flushing tank is higher than the primary flushing tank and lower than the tertiary flushing tank, the primary flushing tank is connected to the recovery tank, and the primary flushing tank is arranged between the recovery tank and the secondary flushing tank, the upper ends of the primary flushing tank, the secondary flushing tank and the tertiary flushing tank are all sealed with the filter screen, the upper ends of the primary flushing tank, the secondary flushing tank and the tertiary flushing tank are all inclined toward the recovery tank side, the input end of the secondary cleaning pipe is connected with the tertiary flushing tank through a first pumping pump, and the input end of the tertiary cleaning pipe is connected with the secondary flushing tank through a second pumping pump.

[0011] Furthermore, the preheating device includes a second support frame, a second drive motor, a preheating conveying pipe, a first heating component and a preheating box, the preheating box is fixedly arranged on the second support frame, the two ends of the preheating conveying pipe are respectively rotatably arranged in the preheating box by second limiting rollers, the preheating box is provided with the first heating component for heating the preheating conveying pipe, the preheating conveying pipe is inclinedly arranged and the upper end is matched with the output end of the roller, the output end of the preheating conveying pipe is matched with the heating device, and the second drive motor is arranged on the second support frame and is used to drive the preheating conveying pipe to rotate.

[0012] Furthermore, the heating device includes a third support frame, a third drive motor, a drying conveying pipe, a second heating component and a drying box, the drying box is arranged on the third support frame, the two ends of the drying conveying pipe are respectively arranged in the drying box through the third limiting roller, the drying box is provided with the second heating component for heating the drying conveying pipe, the third drive motor is arranged on the third support frame and is used to drive the drying conveying pipe to rotate, the drying conveying pipe is inclined and the upper end is matched with the output end of the preheating conveying pipe, and the lower end of the drying conveying pipe is matched with the cooling device.

[0013] Further, the cooling device includes a fourth support frame, a fourth drive motor, a cooling conveying pipe, a cooling box, a cooling water pipe, a cold water spray head, a coolant pipe, a circulation pipe and a circulation pump. The cooling box is arranged on the fourth support frame, and the two ends of the cooling conveying pipe are respectively arranged in the cooling box through the fourth limiting roller. The fourth drive motor is arranged on the fourth support frame and is used to drive the cooling conveying pipe to rotate. The cold water spray head is arranged on the output end of the cooling water pipe and cooperates with the cooling conveying pipe. The cooling water pipe is arranged on the top of the cooling box, the cooling conveying pipe is inclined and the upper end cooperates with the lower end of the drying conveying pipe, the lower end of the cooling conveying pipe cooperates with the material receiving assembly, the coolant pipe is arranged at the bottom of the cooling box and is used to cool the water in the cooling box, the input end of the cooling water pipe is connected with one end of the circulation pipe, and the other end of the circulation pipe is connected with the bottom of the cooling box, and the circulation pump is arranged on the circulation pipe.

[0014] Furthermore, the anti-oxidation device includes a sealing cover and a ventilation pipe, the sealing cover is sealingly fixedly arranged on the cooling box and cooperates with the output end of the cooling conveying pipe, the ventilation pipe is connected to the lower side of the sealing cover, and the bottom of the sealing cover is provided with a drop port that cooperates with the cooling conveying pipe.

[0015] Furthermore, a feeding assembly cooperating with the roller is arranged at the input end of the roller, and an intermediate material transfer assembly is arranged between the output end of the roller and the preheating conveying pipe.

[0016] A method for removing powder and hydrogen for silicon material production uses a system for removing powder and hydrogen for silicon material production, and the method for removing powder and hydrogen comprises the following steps:

[0017] S1: Start the first drive motor, the second drive motor, the third drive motor, the fourth drive motor, the first water pump, the second water pump, the circulation pump, the first heating component and the second heating component to circulate the coolant in the coolant pipe, and introduce nitrogen into the cooling delivery pipe through the ventilation pipe;

[0018] S2: adding silicon raw materials into the drum, the silicon raw materials are washed three times in sequence through the primary washing section, the secondary washing section and the tertiary washing section, and the washed silicon raw materials enter the preheating conveying pipe for heating treatment;

[0019] S3: the temperature in the preheating delivery pipe is controlled at 300-500° C. During preheating, nitrogen is introduced into the preheating delivery pipe to prevent the silicon raw material from being oxidized in the preheating delivery pipe;

[0020] S4: After being preheated, the silicon raw material enters a drying and conveying pipe for drying, during which hydrogen and moisture in the silicon raw material are removed;

[0021] S5: the temperature in the drying and conveying pipe is controlled at 800-900° C. During the drying process, nitrogen is introduced into the drying and conveying pipe to prevent the silicon raw material from being oxidized in the drying and conveying pipe;

[0022] S6: After being dried, the silicon raw material enters the cooling and conveying pipe for cooling. During cooling, nitrogen is introduced into the cooling and conveying pipe for protection to prevent the silicon raw material from being oxidized in the cooling and conveying pipe;

[0023] S7: The cooled silicon raw material enters a material receiving component.

[0024] The beneficial effects of the present invention are:

[0025] 1) In this technology, the fine powder in the silicon material is cleaned, dried and dehydrogenated. During the entire production process, the collision between the silicon materials can be effectively avoided, and the re-generation of fine powder or micro powder can be prevented. The fine powder or micro powder in the silicon material can be effectively avoided to pollute the air, and the silicon material can be prevented from being oxidized.

[0026] 2) In this technology, a three-stage or multi-stage cleaning method is used on the drum to thoroughly wash away the fine powder or micro powder in the silicon material. At the same time, a spiral transmission method is used to avoid collision between silicon materials to generate fine powder or micro powder again.

[0027] 3) In this technology, the tertiary cleaning pipe uses clean water, the secondary cleaning pipe uses water from the tertiary flushing tank, and the primary cleaning pipe uses water from the secondary flushing tank. This can better clean the fine powder or micro powder in the silicon material and effectively save water resources.

[0028] 4) In this technology, the temperature in the heating device is controlled at 800-900°C, which can effectively remove hydrogen and moisture from the silicon raw material.

[0029] 5) In this technology, nitrogen is introduced into the cooling conveying pipe, the preheating conveying pipe and the drying conveying pipe, and the nitrogen fills the cooling conveying pipe, the preheating conveying pipe and the drying conveying pipe, which can effectively prevent the silicon material from being oxidized during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional connection structure diagram of this technology;

[0031] Figure 2 This is a side view of the connection structure of the present technology;

[0032] Figure 3 for Figure 2 AA section connection structure diagram in;

[0033] Figure 4 It is a side view of the connection structure of the cooling device;

[0034] In the figure, 1-first support frame, 2-first drive motor, 3-first limit roller, 4-drum, 5-screening net, 6-spiral plate, 7-screening hole, 8-primary flushing section, 9-secondary flushing section, 10-tertiary flushing section, 11-tertiary cleaning pipe, 12-secondary cleaning pipe, 13-primary cleaning pipe, 14-sprinkler, 15-primary flushing tank, 16-secondary flushing tank, 17-tertiary flushing tank, 18-recovery tank, 19-filter screen, 20-second support frame, 21-second drive motor, 22-preheating conveying pipe, 23-first heating component, 24-preheating box, 25-second limiting roller, 26-third supporting frame, 27-third driving motor, 28-drying conveying pipe, 29-second heating component, 30-drying box, 31-third limiting roller, 32-fourth supporting frame, 33-fourth driving motor, 34-cooling conveying pipe, 35-cooling box, 36-cooling water pipe, 37-cold water spray head, 38-cooling liquid pipe, 39-circulating pipe, 40-circulating pump, 41-fourth limiting roller, 42-sealing cover, 43-ventilation pipe, 44-feeding assembly, 45-intermediate material transfer assembly. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 4 , the present invention provides a technical solution:

[0037] A de-powdering and de-hydrogenating system for silicon material production includes a water washing and distributing device, a preheating device, a heating device, a cooling device and an anti-oxidation device. The water washing and distributing device is connected to the input end of the preheating device, the output end of the preheating device is lower than the input end of the preheating device and is connected to the input end of the heating device, the output end of the heating device is lower than the input end of the heating device and is connected to the input end of the cooling device, and the output end of the cooling device is lower than the input end of the cooling device and is connected to the anti-oxidation device. The water washing and distributing device uses pure water to wash the silicon raw material. After the silicon material is washed, it enters the preheating device for dewatering, and then enters the heating device for thorough dehydrogenation and dehumidification, and finally enters the cooling device for cooling. A large amount of nitrogen is introduced into the preheating device, the heating device, and the cooling device, and the nitrogen fills the cooling conveying pipe, the preheating conveying pipe, and the drying conveying pipe, so that the silicon material can be effectively prevented from being oxidized during the production process, and finally qualified silicon material is obtained.

[0038] The water washing and distributing device comprises a first support frame 1, a spiral conveying and screening assembly, a spray assembly, a first driving motor 2 and a recovery and filtering assembly. The two ends of the spiral conveying and screening assembly are respectively rotatably arranged on the first support frame 1 through the first limiting roller 3. The first driving motor 2 is fixedly arranged on the first support frame 1 and is used to drive the spiral conveying and screening assembly to rotate. The spray assembly is fixedly arranged on the first support frame 1 and is used to spray the silicon material inside the spiral conveying and screening assembly. The recovery and filtering assembly is fixedly arranged directly below the spiral conveying and screening assembly and cooperates with the spiral conveying and screening assembly. The output end of the spiral conveying and screening assembly cooperates with the input end of the preheating device. The input end of the drum 4 is provided with a feeding assembly 44 that cooperates with the drum 4, and an intermediate material transfer assembly 45 is provided between the output end of the drum 4 and the preheating conveying pipe 22. Among them, the spiral conveying and screening component is used to transport silicon raw materials. During the transmission process, the fine powder in the silicon raw materials is screened out, and the unscreened ones enter the preheating device. The function of the spraying component is to spray water on the silicon raw materials in the spiral conveying and screening component to prevent the fine powder from polluting the air during the processing process. The function of the first driving motor 2 is to drive the roller 4 to rotate. The first support frame 1 is provided with at least four first limiting rollers 3. The two ends of the roller 4 are respectively provided with two first limiting rollers 3. The middle part of the roller 4 is also provided with a first limiting roller 3. The first driving motor 2 in the prior art drives the first limiting roller 3 to rotate through a belt, and the first limiting roller 3 drives the roller 4 to rotate. There is filtered water in the recycling and filtering component, and the filtered water can be reused for a second time. The feeding component 44 is a prior art, which can evenly and slowly add silicon raw materials to the roller 4. The function of the intermediate material transfer component 45 is to transport the silicon material discharged from the output end of the roller 4 to the preheating conveying pipe 22. The roller 4 can only rotate on the first limiting roller 3.

[0039] The spiral conveying and screening assembly includes a drum 4, a screening net 5 and a spiral plate 6. The spiral plate 6 is sealed and fixedly provided on the inner wall of the drum 4. The two ends of the spiral plate 6 are respectively flush with the two ends of the drum 4. A plurality of screening holes 7 are provided on the drum 4. The screening holes 7 are matched with the spiral gap formed between the spiral plate 6. The screening net 5 is provided on the inner wall of the drum 4. The screening net 5 is matched with the screening holes 7. The drum 4 and the spiral plate 6 are combined to form a conveying auger. The screening net 5 and the screening holes 7 are provided to facilitate the screening of fine powder. The mesh diameter of the screening net 5 is 0.15 mm.

[0040] In some embodiments, the drum 4 is provided with a primary flushing section 8, a secondary flushing section 9 and a tertiary flushing section 10, the secondary flushing section 9 is arranged between the primary flushing section 8 and the tertiary flushing section 10, and the tertiary flushing section 10 is arranged at the output end side of the drum 4. The spray assembly includes a tertiary cleaning pipe 11, a secondary cleaning pipe 12, a primary cleaning pipe 13 and a nozzle 14, the tertiary cleaning pipe 11, the secondary cleaning pipe 12 and the primary cleaning pipe 13 are all fixedly arranged on the first support frame 1, the output ends of the tertiary cleaning pipe 11, the secondary cleaning pipe 12 and the primary cleaning pipe 13 are all arranged in the drum 4, the output end of the tertiary cleaning pipe 11 is provided with a nozzle 14 cooperating with the tertiary flushing section 10, the output end of the secondary cleaning pipe 12 is provided with a nozzle 14 cooperating with the secondary flushing section 9, the output end of the primary cleaning pipe 13 is provided with a nozzle 14 cooperating with the primary flushing section 8, the input end of the tertiary cleaning pipe 11 is connected to the water source, and the input ends of the secondary cleaning pipe 12 and the primary cleaning pipe 13 are both connected to the recovery and filtration assembly. The flushing section on the drum 4 can be divided into multiple sections, and in this technology, it is divided into three sections. The tertiary cleaning pipe 11, the secondary cleaning pipe 12, and the primary cleaning pipe 13 correspond to the tertiary cleaning section 10, the secondary cleaning section 9, and the primary cleaning section 8 respectively. The tertiary cleaning pipe 11, the secondary cleaning pipe 12, and the primary cleaning pipe 13 are not connected to each other. The tertiary cleaning pipe 11 uses the cleanest water, the secondary cleaning pipe 12 uses the water in the tertiary flushing tank 17, and the primary cleaning pipe 13 uses the water in the secondary flushing tank 16. This not only rinses the silicon material better, but also effectively saves water resources. The tertiary cleaning pipe 11, the secondary cleaning pipe 12, and the primary cleaning pipe 13 are fixed into a whole, and both ends of the whole are fixed on the first support frame 1.

[0041] In some embodiments, the recovery and filtration assembly includes a primary flushing tank 15, a secondary flushing tank 16, a tertiary flushing tank 17, a recovery tank 18 and a filter screen 19. The primary flushing tank 15 cooperates with the primary flushing section 8, the secondary flushing tank 16 cooperates with the secondary flushing section 9, and the tertiary flushing tank 17 cooperates with the tertiary flushing section 10. Both sides of the secondary flushing tank 16 are sealed and connected to the primary flushing tank 15 and the tertiary flushing tank 17 respectively. The upper end of the secondary flushing tank 16 is higher than the primary flushing tank 15 and lower than the tertiary flushing tank 17. The primary flushing tank 15 is connected to the primary flushing tank 15 and the tertiary flushing tank 17. The tank 15 is connected to the recovery tank 18, and the primary flushing tank 15 is arranged between the recovery tank 18 and the secondary flushing tank 16. The upper ends of the primary flushing tank 15, the secondary flushing tank 16, and the tertiary flushing tank 17 are all sealed with a filter screen 19. The upper ends of the primary flushing tank 15, the secondary flushing tank 16, and the tertiary flushing tank 17 are all inclined toward the recovery tank 18. The input end of the secondary cleaning pipe 12 is connected to the tertiary flushing tank 17 through the first pump, and the input end of the tertiary cleaning pipe 11 is connected to the secondary flushing tank 16 through the second pump. Among them, the primary flushing tank 15 stores the waste water generated by the primary flushing section 8, the secondary flushing tank 16 stores the waste water generated by the secondary flushing section 9, and the tertiary flushing tank 17 stores the waste water generated in the tertiary flushing section 10. The tertiary flushing tank 17 is also connected to the clean water source. When the water in the secondary cleaning pipe 12 is insufficient, the tertiary flushing tank 17 will be replenished in time. The purpose of setting the filter 19 is to filter out fine powder and prevent the fine powder from entering the primary flushing tank 15, the secondary flushing tank 16 and the tertiary flushing tank 17. The aperture of the filter 19 is 0.05 mm. The water in the tertiary flushing tank 17 can enter the secondary flushing tank 16, the water in the secondary flushing tank 16 can enter the primary flushing tank 15, and the primary flushing tank 15 can enter the recovery tank 18. A water outlet is set at the bottom of the recovery tank 18.

[0042] In some embodiments, the preheating device includes a second support frame 20, a second drive motor 21, a preheating conveying pipe 22, a first heating component 23 and a preheating box 24. The preheating box 24 is fixedly arranged on the second support frame 20. The two ends of the preheating conveying pipe 22 are rotatably arranged in the preheating box 24 through second limiting rollers 25 respectively. A first heating component 23 for heating the preheating conveying pipe 22 is arranged in the preheating box 24. The preheating conveying pipe 22 is inclined and the upper end is matched with the output end of the roller 4. The output end of the preheating conveying pipe 22 is matched with the heating device. The second drive motor 21 is arranged on the second support frame 20 and is used to drive the preheating conveying pipe 22 to rotate. Among them, the function of the preheating box 24 is to prevent a large amount of heat loss and facilitate the temperature control inside the preheating box 24. Four second limit rollers 25 are arranged under the preheating conveying pipe 22, and two second limit rollers 25 are arranged on the lower side of each end of the preheating conveying pipe 22. The second driving motor 21 in the prior art drives the second limit rollers 25 to rotate through the transmission belt, and the second limit rollers 25 drive the preheating conveying pipe 22 to rotate. The preheating conveying pipe 22 can only rotate on the second limit rollers 25. The output end of the intermediate material transfer component 45 is arranged inside the upper end of the preheating conveying pipe 22. The first heating component 23 is the prior art, and the first heating component 23 is arranged on the upper and lower sides of the preheating conveying pipe 22. The second support frame 20 is a support with adjustable inclination in the prior art, and the inclination of the preheating conveying pipe 22 can be adjusted under the action of the second support frame 20. Waste gas outlets are provided at the upper ends of the preheating device and the heating device. Part of the nitrogen enters the preheating delivery pipe 22 through the drying delivery pipe 28 and is then discharged from the upper end of the preheating delivery pipe 22, thus preventing the silicon material from being oxidized during the preheating process.

[0043] In some embodiments, the heating device includes a third support frame 26, a third drive motor 27, a drying conveying pipe 28, a second heating component 29 and a drying box 30. The drying box 30 is arranged on the third support frame 26. The two ends of the drying conveying pipe 28 are respectively arranged in the drying box 30 through third limiting rollers 31. The drying box 30 is provided with a second heating component 29 for heating the drying conveying pipe 28. The third drive motor 27 is arranged on the third support frame 26 and is used to drive the drying conveying pipe 28 to rotate. The drying conveying pipe 28 is arranged at an angle and the upper end cooperates with the output end of the preheating conveying pipe 22. The lower end of the drying conveying pipe 28 cooperates with the cooling device. Among them, the function of the drying box 30 is to prevent a large amount of heat loss and facilitate the temperature control inside the drying box 30. Four third limit rollers 31 are arranged under the drying conveying pipe 28, and two third limit rollers 31 are arranged on the lower side of each end of the drying conveying pipe 28. The third driving motor 27 in the prior art drives the third limit rollers 31 to rotate through the transmission belt, and the third limit rollers 31 drive the drying conveying pipe 28 to rotate. The drying conveying pipe 28 can only rotate on the third limit rollers 31. The lower end of the preheating conveying pipe 22 is arranged inside the upper end of the drying conveying pipe 28. The second heating component 29 is the prior art, and the second heating component 29 is arranged on the upper and lower sides of the drying conveying pipe 28. The third support frame 26 is a support with adjustable inclination in the prior art, and the inclination of the drying conveying pipe 28 can be adjusted under the action of the third support frame 26. Nitrogen enters the drying conveying pipe 28 through the cooling conveying pipe 34, and part of the nitrogen carries moisture and hydrogen and is discharged from the exhaust gas outlet at the upper end of the drying conveying pipe 28. Another part of the nitrogen enters the preheating conveying pipe 22 through the drying conveying pipe 28 and is then discharged from the upper end of the preheating conveying pipe 22, thereby preventing the silicon material from being oxidized during the drying process.

[0044] In some embodiments, the cooling device includes a fourth support frame 32, a fourth drive motor 33, a cooling delivery pipe 34, a cooling box 35, a cooling water pipe 36, a cold water spray head 37, a coolant pipe 38, a circulation pipe 39 and a circulation pump 40, the cooling box 35 is arranged on the fourth support frame 32, the two ends of the cooling delivery pipe 34 are respectively arranged in the cooling box 35 through the fourth limiting roller 41, the fourth drive motor 33 is arranged on the fourth support frame 32 and is used to drive the cooling delivery pipe 34 to rotate, the cold water spray head 37 is arranged on the cooling water The cooling water pipe 36 is arranged on the output end of the cooling box 35 and cooperates with the cooling conveying pipe 34. The cooling water pipe 36 is arranged on the top of the cooling box 35. The cooling conveying pipe 34 is arranged obliquely and the upper end cooperates with the lower end of the drying conveying pipe 28. The lower end of the cooling conveying pipe 34 cooperates with the material receiving assembly. The cooling liquid pipe 38 is arranged at the bottom of the cooling box 35 and is used to cool the water in the cooling box 35. The input end of the cooling water pipe 36 is connected with one end of the circulation pipe 39. The other end of the circulation pipe 39 is connected with the bottom of the cooling box 35. The circulation pump 40 is arranged on the circulation pipe 39. Among them, the function of the cooling box 35 is to hold water to facilitate heat exchange. Four fourth limiting rollers 41 are arranged under the cooling conveying pipe 34. Two fourth limiting rollers 41 are arranged on the lower side of each end of the cooling conveying pipe 34. The fourth driving motor 33 in the prior art drives the fourth limiting roller 41 to rotate through the transmission belt, and the cooling conveying pipe 34 can only rotate on the fourth limiting roller 41. The fourth limiting roller 41 drives the cooling conveying pipe 34 to rotate, and the lower end of the drying conveying pipe 28 is sealed inside the upper end of the cooling conveying pipe 34. The fourth support frame 32 is a support with adjustable inclination in the prior art, and the inclination of the cooling conveying pipe 34 can be adjusted under the action of the fourth support frame 32. The circulation pipe 39 extracts water from the bottom of the cooling box 35 and delivers it to the cooling water pipe 36 through the circulation pump 40. The cold water in the cooling water pipe 36 is sprayed onto the cooling conveying pipe 34 through the cold water spray head 37. The coolant pipe 38 is connected to the external device, and the coolant pipe 38 drives the coolant circulation to cool the water in the cooling box 35. The material receiving assembly is a prior art and is used to store silicon materials. Nitrogen enters from the lower end of the cooling conveying pipe 34 and then enters the drying conveying pipe 28, so as to prevent the silicon material from being oxidized during the preheating process and the drying process.

[0045] In some embodiments, the anti-oxidation device includes a sealing cover 42 and a vent pipe 43. The sealing cover 42 is sealed and fixedly arranged on the cooling box 35 and cooperates with the output end of the cooling conveying pipe 34. The vent pipe 43 is connected to the lower side of the sealing cover 42. The bottom of the sealing cover 42 is provided with a blanking port that cooperates with the cooling conveying pipe 34. Among them, the sealing cover 42 prevents air from entering the cooling conveying pipe 34. The air in the cooling conveying pipe 34 can be removed through the vent pipe 43 to prevent the silicon material collected at the end from being oxidized. The vent pipe 43 is connected to the nitrogen source equipment on the outside. Some nitrogen is also discharged from the blanking port, and some nitrogen enters the drying conveying pipe 28 through the upper end of the cooling conveying pipe 34. A portion of the nitrogen is discharged from the upper end of the drying conveying pipe 28. Some nitrogen enters the preheating conveying pipe 22 and is discharged from the upper end of the preheating conveying pipe 22. The whole process can prevent the silicon material from being oxidized during the production process. The nitrogen source equipment is a nitrogen tank in the prior art. During the silicon material production process, the nitrogen in the nitrogen tank enters through the ventilation pipe 43.

[0046] A method for removing powder and hydrogen for silicon material production uses a system for removing powder and hydrogen for silicon material production. The method for removing powder and hydrogen comprises the following steps:

[0047] The first drive motor 2, the second drive motor 21, the third drive motor 27, the fourth drive motor 33, the first water pump, the second water pump, the circulating pump 40, the first heating component 23 and the second heating component 29 are started, the coolant circulates in the coolant pipe 38 through the coolant pipe 38, and nitrogen is introduced into the cooling delivery pipe 34 through the ventilation pipe 43. Silicon raw material is added to the drum 4, and the silicon raw material is washed three times in sequence through the primary washing section 8, the secondary washing section 9 and the tertiary washing section 10. The washed silicon raw material enters the preheating conveying pipe 22 for heating treatment; the temperature in the preheating conveying pipe 22 is controlled at 300-500°C, and nitrogen is introduced into the preheating conveying pipe 22 during preheating to prevent the silicon raw material from being oxidized in the preheating conveying pipe 22; the silicon raw material enters the drying conveying pipe 28 for drying after preheating, and hydrogen and moisture in the silicon raw material are removed during the drying process; the temperature in the drying conveying pipe 28 is controlled at 800-900°C, and nitrogen is introduced into the drying conveying pipe 28 during drying to prevent the silicon raw material from being oxidized in the drying conveying pipe 28; the silicon raw material enters the cooling conveying pipe 34 for cooling after drying, and nitrogen is introduced into the cooling conveying pipe 34 during cooling to prevent the silicon raw material from being oxidized in the cooling conveying pipe 34; the cooled silicon raw material enters the receiving assembly.

[0048] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0050] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A powder removal and hydrogen removal system for silicon material production, characterized in that: It comprises a water washing and distributing device, a preheating device, a heating device, a cooling device and an anti-oxidation device, wherein the water washing and distributing device is connected to the input end of the preheating device, the output end of the preheating device is lower than the input end of the preheating device and is connected to the input end of the heating device, the output end of the heating device is lower than the input end of the heating device and is connected to the input end of the cooling device, and the output end of the cooling device is lower than the input end of the cooling device and is connected to the anti-oxidation device; The water washing and material distribution device comprises a first support frame (1), a spiral conveying and screening assembly, a spray assembly, a first drive motor (2) and a recovery and filtering assembly, wherein both ends of the spiral conveying and screening assembly are rotatably arranged on the first support frame (1) via first limit rollers (3), the first drive motor (2) is fixedly arranged on the first support frame (1) and is used to drive the spiral conveying and screening assembly to rotate, the spray assembly is fixedly arranged on the first support frame (1) and is used to spray silicon material inside the spiral conveying and screening assembly, the recovery and filtering assembly is fixedly arranged directly below the spiral conveying and screening assembly and cooperates with the spiral conveying and screening assembly, and the output end of the spiral conveying and screening assembly cooperates with the input end of the preheating device; The spiral conveying and screening assembly comprises a roller (4), a screening net (5) and a spiral plate (6); the spiral plate (6) is sealed and fixedly provided on the inner wall of the roller (4); two ends of the spiral plate (6) are respectively flush with two ends of the roller (4); a plurality of screening holes (7) are provided on the roller (4); the screening holes (7) cooperate with the spiral gap formed between the spiral plate (6); the screening net (5) is provided on the inner wall of the roller (4); the screening net (5) cooperates with the screening holes (7); The drum (4) is provided with a primary flushing section (8), a secondary flushing section (9) and a tertiary flushing section (10), the secondary flushing section (9) being arranged between the primary flushing section (8) and the tertiary flushing section (10), and the tertiary flushing section (10) being arranged on the output end side of the drum (4); The spray assembly comprises a tertiary cleaning pipe (11), a secondary cleaning pipe (12), a primary cleaning pipe (13) and a nozzle (14); the tertiary cleaning pipe (11), the secondary cleaning pipe (12) and the primary cleaning pipe (13) are all fixedly arranged on the first support frame (1); the output ends of the tertiary cleaning pipe (11), the secondary cleaning pipe (12) and the primary cleaning pipe (13) are all arranged in the drum (4); the nozzle (14) cooperating with the tertiary flushing section (10) is arranged on the output end of the tertiary cleaning pipe (11); the nozzle (14) cooperating with the secondary flushing section (9) is arranged on the output end of the secondary cleaning pipe (12); and the nozzle (14) cooperating with the primary flushing section (8) is arranged on the output end of the primary cleaning pipe (13).

2. A powder and hydrogen removal system for silicon material production according to claim 1, characterized in that: The recovery and filtering assembly comprises a primary flushing tank (15), a secondary flushing tank (16), a tertiary flushing tank (17), a recovery tank (18) and a filter screen (19); the primary flushing tank (15) cooperates with the primary flushing section (8); the secondary flushing tank (16) cooperates with the secondary flushing section (9); the tertiary flushing tank (17) cooperates with the tertiary flushing section (10); both sides of the secondary flushing tank (16) are sealedly connected to the primary flushing tank (15) and the tertiary flushing tank (17), respectively; the upper end of the secondary flushing tank (16) is higher than the primary flushing tank (15) and lower than the tertiary flushing tank (17); the primary flushing tank (15) and the tertiary flushing tank (17) are sealedly connected to each other; the upper end of the secondary flushing tank (16) is higher than the primary flushing tank (15) and lower than the tertiary flushing tank (17); the primary flushing tank (15) and the tertiary flushing tank (17) are sealedly connected to each other; The primary flushing tank (15) is connected to the recovery tank (18), and the primary flushing tank (15) is arranged between the recovery tank (18) and the secondary flushing tank (16). The filter screen (19) is sealed at the upper ends of the primary flushing tank (15), the secondary flushing tank (16), and the tertiary flushing tank (17). The upper ends of the primary flushing tank (15), the secondary flushing tank (16), and the tertiary flushing tank (17) are inclined toward the recovery tank (18). The input end of the secondary cleaning pipe (12) is connected to the tertiary flushing tank (17) through a first pump, and the input end of the primary cleaning pipe (13) is connected to the secondary flushing tank (16) through a second pump.

3. A powder and hydrogen removal system for silicon material production according to any one of claims 1-2, characterized in that: The preheating device comprises a second support frame (20), a second drive motor (21), a preheating conveying pipe (22), a first heating component (23) and a preheating box (24); the preheating box (24) is fixedly arranged on the second support frame (20); both ends of the preheating conveying pipe (22) are rotatably arranged in the preheating box (24) via second limit rollers (25); the preheating box (24) is provided with the first heating component (23) for heating the preheating conveying pipe (22); the preheating conveying pipe (22) is inclinedly arranged and the upper end thereof cooperates with the output end of the drum (4); the output end of the preheating conveying pipe (22) cooperates with the heating device; the second drive motor (21) is arranged on the second support frame (20) and is used for driving the preheating conveying pipe (22) to rotate.

4. A powder and hydrogen removal system for silicon material production according to claim 3, characterized in that: The heating device comprises a third support frame (26), a third drive motor (27), a drying conveying pipe (28), a second heating component (29) and a drying box (30); the drying box (30) is arranged on the third support frame (26); both ends of the drying conveying pipe (28) are respectively arranged in the drying box (30) through third limit rollers (31); the drying box (30) is provided with the second heating component (29) for heating the drying conveying pipe (28); the third drive motor (27) is arranged on the third support frame (26) and is used to drive the drying conveying pipe (28) to rotate; the drying conveying pipe (28) is arranged obliquely and the upper end cooperates with the output end of the preheating conveying pipe (22); the lower end of the drying conveying pipe (28) cooperates with the cooling device.

5. A powder and hydrogen removal system for silicon material production according to claim 4, characterized in that: The cooling device comprises a fourth support frame (32), a fourth drive motor (33), a cooling delivery pipe (34), a cooling box (35), a cooling water pipe (36), a cold water spray head (37), a coolant pipe (38), a circulation pipe (39) and a circulation pump (40); the cooling box (35) is arranged on the fourth support frame (32); both ends of the cooling delivery pipe (34) are respectively arranged in the cooling box (35) via fourth limiting rollers (41); the fourth drive motor (33) is arranged on the fourth support frame (32) and is used to drive the cooling delivery pipe (34) to rotate; the cold water spray head (37) is arranged at the cooling water pipe (36); The cooling water pipe (36) is arranged on the top of the cooling box (35), the cooling water pipe (36) is arranged on the output end and cooperates with the cooling conveying pipe (34), the cooling conveying pipe (34) is inclined and the upper end cooperates with the lower end of the drying conveying pipe (28), the lower end of the cooling conveying pipe (34) cooperates with the material receiving assembly, the cooling liquid pipe (38) is arranged at the bottom of the cooling box (35) and is used to cool the water in the cooling box (35), the input end of the cooling water pipe (36) is connected to one end of the circulation pipe (39), the other end of the circulation pipe (39) is connected to the bottom of the cooling box (35), and the circulation pump (40) is arranged on the circulation pipe (39).

6. A powder and hydrogen removal system for silicon material production according to claim 5, characterized in that: The anti-oxidation device comprises a sealing cover (42) and a vent pipe (43); the sealing cover (42) is sealingly fixedly arranged on the cooling box (35) and cooperates with the output end of the cooling conveying pipe (34); the vent pipe (43) is connected to the lower side of the sealing cover (42); and a drop port cooperating with the cooling conveying pipe (34) is arranged at the bottom of the sealing cover (42).

7. A powder and hydrogen removal system for silicon material production according to any one of claims 4 to 6, characterized in that: The input end of the roller (4) is provided with a loading assembly (44) that cooperates with the roller (4), and an intermediate material transfer assembly (45) is provided between the output end of the roller (4) and the preheating conveying pipe (22).

8. A method for removing powder and hydrogen for silicon material production, using the system for removing powder and hydrogen for silicon material production as claimed in claim 7, characterized in that: The powder removal and hydrogen removal method comprises the following steps: S1: starting the first drive motor (2), the second drive motor (21), the third drive motor (27), the fourth drive motor (33), the first water pump, the second water pump, the circulation pump (40), the first heating component (23) and the second heating component (29) to operate, allowing the coolant to circulate in the coolant pipe (38) through the coolant pipe (38), and introducing nitrogen into the cooling delivery pipe (34) through the ventilation pipe (43); S2: adding silicon raw materials into the drum (4), the silicon raw materials are washed three times in sequence through the primary washing section (8), the secondary washing section (9) and the tertiary washing section (10), and the washed silicon raw materials enter the preheating conveying pipe (22) for heating treatment; S3: the temperature in the preheating conveying pipe (22) is controlled at 300-500° C., and during preheating, nitrogen is introduced into the preheating conveying pipe (22) for protection to prevent the silicon raw material from being oxidized in the preheating conveying pipe (22); S4: After being preheated, the silicon raw material enters the drying and conveying pipe (28) for drying, during which hydrogen and moisture in the silicon raw material are removed; S5: the temperature in the drying and conveying pipe (28) is controlled at 800-900° C., and during drying, nitrogen is introduced into the drying and conveying pipe (28) for protection to prevent the silicon raw material from being oxidized in the drying and conveying pipe (28); S6: After being dried, the silicon raw material enters the cooling and conveying pipe (34) for cooling. During cooling, nitrogen is introduced into the cooling and conveying pipe (34) for protection to prevent the silicon raw material from being oxidized in the cooling and conveying pipe (34); S7: The cooled silicon raw material enters a material receiving assembly.

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