A device for recovering silicon powder from industrial silicon furnace flue gas

Abstract

The utility model discloses a kind of silicon powder recovery devices in industrial silicon furnace flue gas, including equipment base, separator tank, smoke inlet and gas outlet, the inside of the separator tank is movably connected with multiple groups of adjusting mechanism for changing flue gas flow rate, the adjusting mechanism includes fixedly connected on the inner side wall of separator tank fixed pivot, the fixed pivot is movably connected with spoiler through fixed link, and the spoiler is in conformity with the inner diameter of separator tank, the end of the spoiler is movably connected with piston;Through fixed link and the spoiler of pivot connection, and piston is movably connected with the end of spoiler and penetrates tank body, when flue gas quantity is larger and flow rate is too fast, tank pressure rises and pushes piston to move out, drives spoiler to rotate to tank wall, expands flue gas flow range to reduce flow rate, prolongs flue gas residence time, makes silicon powder fully settle.

Description

Technical Field

[0001] This utility model relates to the field of industrial silicon powder recovery technology, specifically a silicon powder recovery device from industrial silicon furnace flue gas. Background Technology

[0002] Industrial silicon is a key raw material in photovoltaics, electronics, metallurgy, and other fields. Its production mainly relies on high-temperature smelting processes in submerged arc furnaces. During the smelting process, raw materials such as silica and coke react at high temperatures of 1800-2200℃, generating a large amount of silicon-containing flue gas. After the silicon element in the raw materials volatilizes and sublimates at high temperatures, it forms fine silicon powder, which is discharged from the furnace with the flue gas. If this silicon powder is directly emitted, it will cause serious air pollution. The fine silicon powder is easy to diffuse into the surrounding environment, forming dust pollution, which will harm the respiratory health of operators and may also cause environmental problems such as smog. On the other hand, it will result in a huge waste of resources. Silicon powder has extremely high recycling and reuse value, and direct emission will increase the raw material consumption and cost of industrial silicon production.

[0003] In the existing process of using cyclone separators to separate flue gas and silicon powder, when the air intake is too large, the flow rate of the flue gas in the separator increases sharply. When the flow rate is too high, fine silicon powder is easily carried away by the high-speed airflow and cannot be fully settled in the separation chamber, resulting in reduced separation efficiency. In addition, the high-speed airflow can easily wash the walls of the separator, causing secondary dust and exacerbating silicon powder loss. On the other hand, when the air intake is too small, the centrifugal force generated by the rotation of the flue gas is insufficient to overcome the adhesion between silicon powder particles and airflow. Some silicon powder cannot achieve gas-solid separation and is directly discharged with the exhaust gas, which wastes high-purity silicon resources and makes it difficult to meet the atmospheric pollutant emission standards of industrial furnaces and kilns.

[0004] Therefore, this utility model provides a silicon powder recovery device in industrial silicon furnace flue gas to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a silicon powder recovery device for industrial silicon furnace flue gas. It solves the problems mentioned above, where when the air intake is too large, the flow rate of the flue gas in the separator increases sharply. When the flow rate is too high, fine silicon powder is easily carried away by the high-speed airflow and cannot settle sufficiently in the separation chamber, resulting in reduced separation efficiency. Furthermore, the high-speed airflow can easily wash the wall of the separator, causing secondary dust and exacerbating silicon powder loss. On the other hand, when the air intake is too small, the centrifugal force generated by the rotation of the flue gas is insufficient to overcome the adhesion between silicon powder particles and the airflow, and some silicon powder cannot achieve gas-solid separation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a silicon powder recovery device from industrial silicon furnace flue gas, comprising a base, a separator tank, a flue gas inlet, and a flue gas outlet. The separator tank contains multiple sets of regulating mechanisms for changing the flue gas flow rate. Each regulating mechanism includes a fixed rotating shaft fixedly connected to the inner wall of the separator tank. The fixed rotating shaft is movably connected to a baffle plate via a fixed rod, and the baffle plate fits against the inner diameter of the separator tank. A piston is movably connected to the end of the baffle plate, and the piston penetrates the separator tank. This causes the internal pressure of the separator tank to rise when the flue gas flow rate increases, thereby pushing the piston towards... The external push causes the sticking plate to rotate closer to the inner wall of the separator tank, thereby expanding the flow range inside the separator tank, reducing the flow rate of flue gas inside the separator tank, and increasing the time the flue gas stays inside the separator tank, thus improving the separation efficiency. When the flue gas volume is small, a low pressure is generated inside the separator tank, which will cause the piston to be drawn into the separator tank. This causes the baffle plate to rotate around the fixed axis away from the separator tank, thereby reducing the flow range inside the separator tank, increasing the flow rate of flue gas inside the separator tank, increasing the centrifugal force of separation, and thus throwing out the silicon powder. A retention mechanism is provided at the bottom of the outlet.

[0007] Preferably, the bottom of the separator tank is provided with a discharge mechanism for collecting silicon powder. The discharge mechanism includes a device bracket fixed to the bottom of the separator tank, and a motor is provided on the side of the device bracket. A rotary door is movably connected inside the device bracket, and the rotary door is fixedly connected to the output shaft of the motor so that when the motor rotates, it drives the rotary door to rotate, thereby throwing the separated silicon powder out of the separator tank and breaking up the silicon powder to prevent it from agglomerating.

[0008] Preferably, multiple sets of moisture-absorbing heads are fixedly connected to the side of the rotary door, and a dispersing protrusion matching the side of the rotary door is fixedly connected to the inner wall of the equipment bracket, so as to better disperse the silicon powder. In addition, since silicon powder is prone to clumping when it comes into contact with water, it is prevented from combining with water vapor and clumping after the high-temperature flue gas cools down.

[0009] Preferably, the end of the baffle is fixedly connected to an adhesive plate for adsorbing large particulate impurities in the flue gas.

[0010] Preferably, the piston is movably connected to the end of the spoiler via a rotating shaft, and the spoiler has an internal groove that matches the rotating shaft.

[0011] Preferably, the retention mechanism includes a rotating tank rotatably connected to the bottom of the outlet. A turbine is fixed on the side of the rotating tank, and a rotating ring is fixedly connected to the bottom of the rotating tank. A centrifugal shutter is movably connected inside the rotating ring so that when the flue gas volume is large, the flue gas drives the turbine to rotate faster. Under the action of centrifugal force, the movable plate of the centrifugal shutter is thrown out, thereby increasing the amount of gas discharged from the separator tank to the outlet, thereby reducing the pressure inside the separator tank and matching the flue gas entry rate. The reverse is also true.

[0012] This invention provides a device for recovering silicon powder from industrial silicon furnace flue gas. Compared with the prior art, it has the following advantages: (1) The silicon powder recovery device in the flue gas of the industrial silicon furnace has a baffle plate connected to the fixed rod and the rotating shaft, and a piston that is movably connected to the end of the baffle plate and penetrates the tank. When the flue gas volume is large and the flow rate is too fast, the gas pressure inside the tank rises and pushes the piston outward, which drives the baffle plate to rotate towards the tank wall, expands the flue gas flow range to reduce the flow rate, prolongs the flue gas residence time, and allows the silicon powder to settle fully. When the flue gas volume is small, the low-pressure adsorption piston inside the tank moves inward, causing the baffle plate to rotate towards the center of the tank, reducing the flow range and increasing the flue gas flow rate, enhancing the centrifugal force to overcome the adhesion between the silicon powder and the airflow, and preventing the silicon powder from being discharged with the tail gas. This solves the problem of low separation efficiency and silicon powder loss caused by fluctuations in the intake volume of traditional devices.

[0013] (2) The silicon powder recovery device in the flue gas of the industrial silicon furnace separates the silicon powder into the support. The motor drives the rotating door to push the silicon powder outward. During the process, the moisture absorption head absorbs the water vapor generated by the cooling of the high temperature flue gas in the silicon powder. At the same time, the broken protrusions interact with the rotating door to impact the accumulated silicon powder, effectively preventing the silicon powder from clumping when it comes into contact with water. This ensures that the silicon powder can be discharged smoothly and kept in good condition, which is convenient for subsequent reuse and reduces resource waste. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the overall structure of this utility model; Figure 2 This is an exploded view of the overall structure of this utility model; Figure 3 This is a cross-sectional view of the material discharge mechanism of this utility model; Figure 4 This is a cross-sectional view of the retention mechanism of this utility model; Figure 5 This is an exploded view of the adjustment mechanism of this utility model.

[0015] In the picture: 1. Equipment base; 2. Separator tank; 3. Smoke inlet; 4. Air outlet; 5. Discharge mechanism; 51. Equipment support frame; 52. Motor; 53. Rotary door; 54. Moisture-absorbing head; 6. Retention mechanism; 61. Rotating tank; 62. Turbine; 63. Rotating ring; 64. Centrifugal shutter; 7. Adjustment mechanism; 71. Fixed shaft; 72. Fixed rod; 73. Spoiler; 74. Adhesive plate; 75. Piston; 76. Shaft; 77. Movable groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0017] Please see Figures 1 to 5 A silicon powder recovery device from industrial silicon furnace flue gas includes a base 1, a separator tank 2, a flue gas inlet 3, and a flue gas outlet 4. Multiple sets of regulating mechanisms 7 for changing the flue gas flow rate are movably connected inside the separator tank 2. Each regulating mechanism 7 includes a fixed rotating shaft 71 fixedly connected to the inner wall of the separator tank 2. A baffle plate 73 is movably connected to the fixed rotating shaft 71 via a fixed rod 72, and the baffle plate 73 fits against the inner diameter of the separator tank 2. A piston 75 is movably connected to the end of the baffle plate 73, and the piston 75 penetrates the separator tank 2. This causes the internal air pressure of the separator tank 2 to rise when the flue gas flow rate increases, thereby pushing the piston 75 outward. This, in turn, causes the adhesion plate 74 to rotate closer to the inner wall of the separator tank 2, thereby expanding the flow range inside the separator tank 2 and reducing the flow rate of the flue gas during separation. The flow rate inside the separator tank 2 increases the time that the flue gas stays inside the separator tank 2, thereby improving the separation efficiency. When the flue gas volume is small, a low pressure is generated inside the separator tank 2, which will cause the piston 75 to be drawn into the interior of the separator tank 2. This causes the baffle plate 73 to rotate around the fixed rotating shaft 71 in a direction away from the separator tank 2, thereby reducing the flow range inside the separator tank 2, thereby increasing the flow rate of the flue gas inside the separator tank 2, increasing the centrifugal force of separation, and thus throwing out the silicon powder. A retention mechanism 6 is provided at the bottom of the outlet 4. An adhesion plate 74 for adsorbing large particulate impurities in the flue gas is fixedly connected to the end of the baffle plate 73. The piston 75 is movably connected to the end of the baffle plate 73 through the rotating shaft 76, and the interior of the baffle plate 73 is provided with a movable groove 77 that matches the rotating shaft 76. During operation, the silicon-containing flue gas generated by the industrial silicon furnace enters the separator tank 2 through the flue gas inlet 3. When the flue gas volume is large and the flow rate increases, the gas pressure inside the separator tank 2 rises accordingly. The high pressure pushes the piston 75, which penetrates the tank, to move outward. The piston 75 is connected to the end of the baffle 73 via a rotating shaft 76, and the rotating shaft 76 can be adapted to move within the movable groove 77 inside the baffle 73. Therefore, the outward movement of the piston will cause the baffle 73 to rotate around the fixed rotating shaft 71 towards the inner wall of the separator tank 2, thereby expanding the flow range of the flue gas inside the tank, slowing down the flow rate of the flue gas inside the tank, and prolonging the flue gas residence time, thus facilitating the production of silicon powder. Sufficient settling and separation conditions are provided, while the adhesion plate 74 at the end of the baffle 73 adsorbs large particulate impurities in the flue gas, reducing the interference of impurities on the separation process. When the flue gas volume is small and the flow rate is slow, a low-pressure environment is formed inside the separator tank 2. The low pressure will draw the piston 75 into the tank. The piston moves inward and drives the baffle 73 to rotate around the fixed rotating shaft 71 in a direction away from the tank wall, reducing the flow range of the flue gas inside the tank. This makes the flue gas flow rate faster in a limited space and enhances the centrifugal force generated by the rotation of the flue gas. This centrifugal force can overcome the adhesion between the silicon powder particles and the airflow, throwing the silicon powder out of the airflow and realizing gas-solid separation. Example

[0018] Please see Figures 1 to 5 This embodiment provides a technical solution based on Embodiment 1: A discharge mechanism 5 for collecting silicon powder is provided at the bottom of the separator tank 2. The discharge mechanism 5 includes a device support 51 fixed to the bottom of the separator tank 2, and a motor 52 is provided on the side of the device support 51. A rotary door 53 is movably connected inside the device support 51, and the rotary door 53 is fixedly connected to the output shaft of the motor 52, so that when the motor 52 rotates, it drives the rotary door 53 to rotate, thereby throwing the separated silicon powder out of the separator tank 2 and breaking up the silicon powder to prevent it from agglomerating. Multiple sets of moisture-absorbing heads 54 are fixedly connected to the side of the rotary door 53, and a device is fixedly connected to the inner wall of the device support 51. The rotating door 53 has matching dispersing protrusions on its side to better disperse the silicon powder. Since silicon powder is prone to clumping when it comes into contact with water, this prevents it from combining with water vapor and clumping after the high-temperature flue gas cools down. The retention mechanism 6 includes a rotating tank 61 rotatably connected to the bottom of the outlet 4. A turbine 62 is fixed on the side of the rotating tank 61, and a rotating ring 63 is fixedly connected to the bottom of the rotating tank 61. A centrifugal shutter 64 is movably connected inside the rotating ring 63 so that when the flue gas volume is large, the flue gas drives the turbine 62 to rotate faster. Under the action of centrifugal force, the movable plate of the centrifugal shutter 64 is thrown out, thereby increasing the amount of gas discharged from the separator tank 2 to the outlet 4, thereby reducing the pressure inside the separator tank 2 and matching the flue gas entry rate. The reverse is also true. During operation, after initial separation within the separator tank 2, the flue gas flows towards the outlet 4. During this flow, the flue gas impacts the turbine 62 on the side of the rotating tank 61. When the flue gas volume is large, the impact force on the turbine 62 increases, causing the turbine 62, the fixed rotating tank 61, and the rotating ring 63 to rotate faster. Under the centrifugal force generated by the high-speed rotation, the centrifugal shutter 64 inside the rotating ring 63 causes its movable plate to be thrown outwards, widening the ventilation channel between the rotating ring 63 and the outlet 4. This increases the amount of gas flowing from the separator tank 2 to the outlet 4, rapidly reducing the pressure inside the tank and matching the flue gas inlet rate, preventing high pressure from causing silicon powder to be carried away by the airflow. When the flue gas volume is small, the impact force on the turbine 62 weakens, and the rotation speed of the turbine 62 and the rotating ring 63 slows down. As the force decreases, the movable plate of the centrifugal shutter 64 closes under the action of its own structural restoring force, narrowing the ventilation channel, reducing the amount of air output, maintaining a stable pressure inside the tank, and ensuring that the centrifugal force is sufficient to separate the silicon powder. At the same time, the separated silicon powder falls downward into the equipment bracket 51 under the action of gravity. The motor 52 is started, and the output shaft of the motor 52 drives the fixed rotary door 53 to rotate. During the rotation of the rotary door 53, the silicon powder inside the equipment bracket 51 is pushed outward to achieve silicon powder collection. At the same time, the moisture-absorbing head 54 on the side of the rotary door 53 will absorb the water vapor generated by the cooling of the high-temperature flue gas in the silicon powder, preventing the silicon powder from clumping when it comes into contact with water. In addition, the dispersing protrusions on the inner wall of the equipment bracket 51 and the rotating rotary door 53 will impact and disperse the accumulated silicon powder to prevent silicon powder from clumping and ensure smooth discharge of silicon powder.

[0019] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0020] Working Principle: During operation, the silicon-containing flue gas generated during the industrial silicon furnace smelting process is first precisely introduced into the separator tank 2 through the flue gas inlet 3. After the flue gas enters the tank, if the flue gas volume is too large and the flow rate is too high, the gas pressure inside the tank increases, pushing the piston 75 to move outward. This causes the baffle 73 to rotate towards the tank wall via the rotating shaft 76 (adaptively moving along the movable groove 77), expanding the flue gas flow space to reduce the flow rate and prolong the flue gas residence time. At the same time, the adhesion plate 74 adsorbs large particulate impurities. If the flue gas volume is too small and the flow rate is insufficient, a low pressure is formed inside the tank, causing the adsorption piston 75 to move inward, driving the baffle 73 to rotate towards the center of the tank, reducing the flow space to increase the flow rate and enhance the centrifugal force, ensuring that silicon powder is thrown out of the airflow. During this process, the flue gas flows... The turbine 62 rotates faster when the flue gas volume is large, and the centrifugal force causes the centrifugal shutter 64 to open, increasing the gas output to balance the pressure inside the tank. When the flue gas volume is small, the turbine 62 rotates slower, and the centrifugal shutter 64 closes, reducing the gas output to maintain stable pressure and avoid abnormal pressure affecting the separation effect. The separated silicon powder falls into the discharge mechanism 5 at the bottom under the action of gravity. The motor 52 is started, and its output shaft drives the rotary door 53 to rotate, conveying the silicon powder outward. During the conveying process, the moisture absorption head 54 absorbs the moisture in the silicon powder, breaks up the protrusions and impacts the silicon powder with the rotary door 53, and prevents the silicon powder from agglomerating. The clean exhaust gas after the silicon powder separation and recovery is discharged smoothly from the outlet 4, avoiding the problems of low separation efficiency and silicon powder loss caused by fluctuations in the intake volume.

[0021] It should be noted that all standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silicon powder recovery device from industrial silicon furnace flue gas, comprising a base (1), a separator tank (2), a flue gas inlet (3), and a flue gas outlet (4), characterized in that: The separator tank (2) is internally connected to multiple sets of adjustment mechanisms (7) for changing the flue gas flow rate. The adjustment mechanism (7) includes a fixed rotating shaft (71) fixedly connected to the inner wall of the separator tank (2). The fixed rotating shaft (71) is movably connected to a baffle plate (73) through a fixed rod (72). The baffle plate (73) fits against the inner diameter of the separator tank (2). The end of the baffle plate (73) is movably connected to a piston (75), and the piston (75) penetrates the separator tank (2). The bottom of the outlet (4) is provided with a retention mechanism (6).

2. The silicon powder recovery device in industrial silicon furnace flue gas according to claim 1, characterized in that: The bottom of the separator tank (2) is provided with a discharge mechanism (5) for collecting silicon powder. The discharge mechanism (5) includes a device bracket (51) fixed to the bottom of the separator tank (2), and a motor (52) is provided on the side of the device bracket (51). A rotary door (53) is movably connected inside the device bracket (51), and the rotary door (53) is fixedly connected to the output shaft of the motor (52).

3. The silicon powder recovery device in industrial silicon furnace flue gas according to claim 2, characterized in that: Multiple sets of moisture-absorbing heads (54) are fixedly connected to the side of the rotary door (53), and a dispersing protrusion that matches the side of the rotary door (53) is fixedly connected to the inner wall of the equipment bracket (51).

4. The silicon powder recovery device in industrial silicon furnace flue gas according to claim 1, characterized in that: The end of the baffle (73) is fixedly connected to an adhesive plate (74) for adsorbing large particulate impurities in the flue gas.

5. The silicon powder recovery device in industrial silicon furnace flue gas according to claim 1, characterized in that: The piston (75) is movably connected to the end of the spoiler (73) via a rotating shaft (76), and the spoiler (73) has an active groove (77) inside that matches the rotating shaft (76).

6. The silicon powder recovery device in industrial silicon furnace flue gas according to claim 1, characterized in that: The retention mechanism (6) includes a rotating tank (61) rotatably connected to the bottom of the air outlet (4), a turbine (62) is fixed on the side of the rotating tank (61), and a rotating ring (63) is fixedly connected to the bottom of the rotating tank (61). A centrifugal shutter (64) is movably connected inside the rotating ring (63).

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