Closed industrial silicon submerged arc furnace

Abstract

The invention belongs to the field of industrial silicon submerged arc furnace smelting, and provides a closed industrial silicon submerged arc furnace which comprises a submerged arc furnace body, a supporting platform is arranged above the furnace body, and a discharging uniform distribution device, a flue gas emission system, an electrode operation system, a feed system and a two-dimensional space movement furnace ramming device are arranged above the supporting platform. A water-cooling closed smoke hood is fixed below the supporting platform, a furnace charge preheating device is arranged at the top end in the water-cooling closed smoke hood, a three-dimensional space movement furnace ramming device, an electrode operation visible system and an explosion-proof device are arranged on the side part of the water-cooling closed smoke hood, and an oxygen blowing refining device and a continuous silicon discharging device are arranged on the side part of the furnace body; and a furnace body rotating system is also arranged at the bottom of the furnace body. The problems that the industrial silicon submerged arc furnace is high in energy consumption, large in emission, low in efficiency and the like in the smelting operation process are solved, and the beneficial effects of low consumption, less emission, zero emission and the like are achieved.

Description

Technical Field

[0001] The invention belongs to the field of industrial silicon submerged arc furnace smelting, in particular to a closed industrial silicon submerged arc furnace. Background Art

[0002] The submerged arc furnace mainly utilizes redox reaction to melt useful elements from ores or oxides. The electrodes on the submerged arc furnace feed a large current into the furnace, so that an arc and resistance heat are generated between the electrode end and the charge, and then a physical and chemical reaction occurs to obtain the product. At present, all industrial silicon submerged arc furnaces use semi-closed submerged arc furnaces. When the furnace is rammed, the furnace door needs to be opened, causing a large amount of cold air to penetrate into the furnace, resulting in heat loss in the furnace and increasing the difficulty of flue gas treatment. The existing submerged arc furnace smelting process is rough refining in the furnace, refining outside the furnace, ingot casting, crushing, grinding, packaging and shipping, which has high energy consumption, low yield and high carbon emission.

[0003] To this end, those skilled in the art have proposed a closed industrial silicon submerged arc furnace to solve the problems raised in the background art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a closed industrial silicon submerged arc furnace to solve the problems existing in the prior art.

[0005] A closed industrial silicon ore-fired furnace comprises a furnace body, wherein a water-cooled closed fume hood device is arranged on the upper part of the furnace body.

[0006] Preferably, the water-cooled enclosed fume hood device is characterized in that 9 to 27 two-dimensional space motion tamping devices are installed on the upper part; and 3 to 15 three-dimensional space motion tamping devices are installed on the side.

[0007] Preferably, the silicon outlet of the furnace is connected to an oxygen blowing refining device, and then connected to a continuous silicon granulation device, so as to finally obtain a micron-level powder material with controllable particle size.

[0008] Preferably, the water-cooled enclosed hood device is mounted with three or more preheating devices on the top to prevent the flow of smoke and effectively absorb and block the conductive electrode holding tube from heat radiation. No less than three explosion-proof and inspection holes and industrial TV cameras are installed on the side. The enclosed hood is fixed on the upper platform, which is supported by multiple columns.

[0009] Preferably, the upper platform is equipped with three or more insulated distribution hoppers for achieving uniform distribution of materials to the preheating device, and the upper part is respectively connected to the feed branch pipe from the bell valve and the insulated circumferential gas collecting pipe from the flue gas in the furnace.

[0010] Preferably, the gas collecting pipe is connected to the inlet of the waste heat boiler, the outlet of the waste heat boiler is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the centrifugal fan, 10 or more water mist nozzles are arranged on the inlet pipe of the centrifugal fan to further capture dust and cool it down, and then the fan blades are stirred to achieve dead angle dust capture and cooling, the fan outlet is connected to the inlet of the centrifugal dehydrator, the outlet of the centrifugal dehydrator is connected to the air intake pipe of the internal combustion engine, and the air intake pipe is externally connected with a differential pressure transmitter to ensure that the closed ore-fired furnace flue gas system is always in a micro-positive pressure and safe operation, the water outlet of the centrifugal dehydrator is connected to a vacuum dehydration belt conveyor, the dehydrated solid waste is centrally treated, and the reclaimed water is recycled.

[0011] Preferably, the feeding system is composed of a furnace transformer and a low-voltage compensator, or a rectifier cabinet, or a variable-frequency flexible power supply and a secondary bus, and a conductive copper tile. The conductive copper tile is embraced by a chain hoop device and locked or loosened by a wedge block pushed by a hydraulic cylinder.

[0012] Preferably, the two-dimensional space motion tamping device is fixed on the upper platform, and a monorail trolley is installed on the upper part of the fixed track of the tamping device. The trolley is equipped with a telescopic mechanism and can be moved to the position where the tamping operation is required at any time. The monorail trolley may not be provided, and each tamping device operates independently.

[0013] The three-dimensional motion tamping device is installed on the side of the closed smoke hood, and two small oil cylinders fixed on the closed smoke hood at a 90-degree angle interactively drive the sleeve to achieve 360-degree swing, and the retractable tamping rod in the sleeve is superimposed to realize the three-dimensional space tamping operation.

[0014] Preferably, the float valve of the differential pressure transmitter automatically drops when the system pressure drops, partially closing the centrifugal fan inlet, and vice versa. At the same time, the frequency converter is controlled by the output signal of the pressure sensor to achieve the speed change of the fan motor, so as to keep the flue gas system differential pressure fluctuating within a certain value.

[0015] Preferably, after the continuous silicon granulation device passes the oxygen blowing refining, the melt is controlled by a needle valve and flows into the atomization device, which consists of a closed water-cooled shell with a cooling coil inside, filled with inert gas, and a discharge valve at the bottom.

[0016] Preferably, the chain hoop device is characterized in that it is similar to a tank chain rail embracing a copper tile, with wedge-shaped sleeves interlaced at the joint, and a wedge-shaped block inserted inside and driven by a cylinder to lock or loosen

[0017] Through the above technical solution,

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The ore-fired furnace body and the smoke hood of the present invention are sealed by a water seal structure, the smoke hood is a water-cooled sealed smoke hood, and a charge preheating device is arranged in the furnace body. During operation, the hot smoke generated by the smelting reaction in the furnace body is fully utilized to heat the pre-added charge to 300-400°C when discharged, thereby reducing energy consumption. With the smelting consumption, the material is replenished in real time, a vertical two-dimensional furnace tamping manipulator device is arranged on the furnace top, and a three-dimensional space motion furnace tamping device is arranged on the side of the water-cooled smoke hood, which can perform omnidirectional furnace tamping operations without dead angles, and it is no longer necessary to open the furnace door for furnace tamping operations, thereby eliminating a large amount of cold air from penetrating into the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a closed industrial silicon submerged arc furnace according to the present invention;

[0021] Figure 2 for Figure 1 A top view of a closed industrial silicon ore-fired furnace is shown;

[0022] Figure 3 for Figure 1 The structural schematic diagram of the charge preheating device shown;

[0023] Figure 4 for Figure 1 A schematic diagram of the planar structure of the electrode operation system shown;

[0024] Figure 5 for Figure 1 A schematic diagram of the three-dimensional structure of the electrode operation system shown;

[0025] Figure 6 It is a structural schematic diagram of the two-dimensional space motion tamping device of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the three-dimensional space motion tamping device of the present invention;

[0027] Figure 8 It is a schematic structural diagram of the silicon granulation device of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the micro positive pressure balancing device of the present invention.

[0029] In the figure:

[0030] 100. Furnace body; 1. Rotating device; 2. Furnace shell; 3. Asbestos board; 4. Refractory brick lining; 5. Carbon material layer; 6. Support column; 7. Water seal; 8. Visual system; 9. Sealed smoke hood; 10. Power supply system; 11. Support platform; 12. Furnace charge preheating device; 13. Smoke exhaust system; 14. Material distribution device; 15. Insulated material distribution hopper; 16. Two-dimensional space motion furnace tamping device; 16.1 , ramming claw; 16.2, preheating device; 16.3, water-cooled connecting rod; 16.4, sealing sleeve; 16.5, water seal groove 1; 16.6, water seal buoy 1; 16.7, guide slider; 16.8, guide groove; 16.9, driving part; 17, electrode operation system; 17.1 electrode pressing device; 17.2 copper tile clamping device; 17.3 cooling jacket; 17.4 graphite ring; 17.5 locking oil Cylinder; 17.6 wedge-shaped sleeve; 18, inspection and explosion-proof hole; 19, three-dimensional space motion furnace tamping device; 19.1, connecting ball; 19.2, flange pair; 19.3, sleeve; 19.4, driving mechanism; 19.5, furnace tamping rake; 19.6, transmission mechanism; 19.7, sealing partition; 20, oxygen blowing refining device; 20.1, discharge channel; 20.1, oxygen inlet; 21, silicon granulation device; 21.1. Atomizer; 21.2. Water cooling device; 21.3. Collecting system; 21.4. Air shutoff device; 22. Feeding hole; 23. Discharging port; 24. Balance cabinet; 25. Second water seal groove; 26. Second water seal buoy; 27. Counterweight; 28. Inlet pipe; 29. ​​Outlet pipe; 30. Conical valve; 31. Centrifugal fan; 32. Spraying device; 33. Centrifugal dehydrator; 34. Vacuum dehydration belt conveyor. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] Embodiment 1: As shown in the attached Figure 1 To Attachment Fig. 9 As shown: The present invention provides a closed industrial silicon ore furnace, comprising a furnace body 100, a support platform 11 is arranged above the furnace body 100, a material uniform distribution device 14, a flue gas exhaust system 13, an electrode operation system 17, a feeding system 10 and a two-dimensional space motion furnace tamping device 16 are arranged above the support platform 11, and a water-cooled closed smoke hood 9 is fixed below the support platform 11;

[0033] A steel shell is arranged on the outside of the furnace body 100, and an asbestos board 3 is arranged inside the steel shell. The asbestos board 3 serves as a heat-insulating flexible layer, and a refractory brick lining 4 is arranged inside the asbestos board 3; the upper part of the furnace bottom steel shell is a refractory brick layer, and the upper layer of the refractory brick is a high-temperature resistant carbon material layer. A rotating device 1 is arranged at the bottom of the furnace body 100, and six supporting columns 6 are arranged around the furnace body 100. The supporting columns 6 adopt a cable-stayed structure, and the tops of all the supporting columns 6 are connected to a supporting platform 11. A water-cooled sealed smoke hood 9 is suspended below the supporting platform 11, and the water-cooled sealed smoke hood 9 and the upper part of the furnace body 100 are sealed with a water seal structure;

[0034] The furnace body 100 is also provided with an electrode operation system 17 and a micro-positive pressure balancing device.

[0035] like Figure 1 As shown, the furnace body 100 of the ore-fired furnace is a steel shell, which is welded with steel plates. The inner side of the steel shell is a heat-insulating flexible layer of an asbestos board 3, and the inner side of the asbestos board 3 is a refractory brick lining 4; the upper part of the furnace bottom steel shell is a refractory brick layer, and the upper layer of the refractory brick is a high-temperature resistant carbon material layer. A rotating device 1 is arranged at the bottom of the furnace body 100, and support columns 6 are arranged around the furnace body 100. The columns are inclined and the tops of all the columns are connected to the support platform 11. A water-cooled sealed smoke hood 9 is suspended below the support platform 11, and the water-cooled sealed smoke hood 9 and the upper part of the furnace body 100 are sealed with a water seal structure.

[0036] An inspection and explosion-proof hole 18 and a nitrogen inlet hole are arranged on the outer ring side of the water-cooled sealed smoke hood 9 for purging when needed; a uniformly distributed visual system 8 is arranged along the circumferential direction on the side of the water-cooled sealed smoke hood 9, and the camera of the visual system 8 is passed into the submerged arc furnace body 100, so that the operating status of the three-phase electrodes in the furnace can be observed without blind spots. The visual screen is placed in the submerged arc furnace control room. The entire visual system 8 is purged and cooled with nitrogen or clean coal gas, and forced water cooling is also used for cooling; before opening the inspection and explosion-proof hole 18 or the visual system 8, the coal gas in the submerged arc furnace must be purged clean with nitrogen, and the oxygen content must be detected to prevent the explosion caused by the entry of air into the submerged arc furnace body 100. The visual system 8 observes the environment in the submerged arc furnace body 100 through the camera, and remote control operations can be realized.

[0037] A vertical two-dimensional space motion tamping device 16 is evenly distributed on the upper part of the supporting platform 11, and a three-dimensional space motion tamping device 19 is evenly arranged in the circumferential direction of the side of the water-cooled closed smoke hood 9.

[0038] like Figure 6As shown, the two-dimensional space motion furnace tamping device 16 comprises a furnace tamping claw 16.1, a furnace tamping arm, a water-cooled connecting rod 16.3, a sealing sleeve 16.4 and a driving member 16.9. The furnace tamping claw 16.1 is fixed to the bottom end of the furnace tamping arm, the furnace tamping arm is connected to the water-cooled connecting rod 16.3, the water-cooled connecting rod 16.3 is connected to the driving member 16.9, and a spiral guide groove 16.8, a sealing sleeve 16.4 and a guide slider 16.7 are fixed on the water-cooled connecting rod 16.3, and the two-dimensional motion of the furnace tamping claw 16.1 is synthesized when the driving member 16.9 moves up and down. A water seal groove 16.5 is arranged inside the sealing sleeve 16.4, and a water seal buoy 16.6 is arranged on the water-cooled connecting rod 16.3 to achieve sealing isolation between the inside and outside of the furnace.

[0039] like Figure 7 As shown, the three-dimensional space motion furnace tamping device 19 comprises a connecting sphere 19.1, a spherical flange pair 19.2, a sleeve 19.3, a driving mechanism 19.4, a furnace tamping rake 19.5 and a transmission mechanism 19.6. One end of the connecting sphere 19.1 is connected to the closed smoke hood 9, and the other end is in contact with the spherical flange pair 19.2 fixed on the sleeve 19.3. The furnace tamping rake 19.5 is placed in the sleeve 19.3, one end of which is connected to the transmission mechanism 19.6, and the other end passes through the sealing partition 19.7. The closed smoke hood 9 extends into the ore-fired furnace body 100. The outer side of the sleeve 19.3 is connected to the driving mechanism 19.4. The driving mechanism 19.4 drives the sleeve 19.3 to swing by the synthetic motion of two small oil cylinders with staggered degrees, and the retractable furnace tamping rod in the sleeve 19.3 is superimposed to realize the three-dimensional space furnace tamping operation.

[0040] like Figure 1 and Figure 2 As shown, a feeding hole 22 is evenly arranged on the supporting platform 11 around the electrode, the top of the feeding hole 22 is connected to the heat-insulated material distribution hopper 15 for even material distribution, the inlet of the heat-insulated material distribution hopper 15 is connected to the outlet of the material distribution device 14, and the bottom of the feeding hole 22 is connected to the charge preheating device 12 surrounding the electrode, the charge preheating device 12 is suspended on the closed smoke hood 9, and the bottom of the charge preheating device 12 is directly connected to the top surface of the charge to complete real-time charging. The charge preheating device 12 is always filled with charge to recover the heat of the high-temperature gas generated by the reaction during the smelting of the ore-fired furnace to preheat the charge inside, and when it is moved to the smelting area, the heating efficiency is accelerated, and the energy utilization efficiency is improved at the same time.

[0041] like Figure 4 and Figure 5As shown, the electrode operation system 17 includes an electrode pressing device and a copper tile clamping device located in the cooling jacket and distributed up and down. The copper tile clamping device is surrounded by a tank chain rail and clamps the copper tile on the outer circle of the electrode. The male and female wedge sleeves are connected and locked or loosened by a telescopic locking cylinder. The electrode pressing device is structured on the cooling jacket. A graphite ring is installed at the bottom of the cooling jacket. The inner side of the graphite ring is higher than the outer side and is close to the electrode. The graphite ring is used to protect the cooling water jacket from being burned by piercing fire.

[0042] like Figure 8 As shown, an oxygen blowing refining device 20 and a continuous silicon granulation device 21 are provided at the silicon water outlet position on the side of the furnace body 100, and the silicon water smelted by the furnace body 100 continuously flows into the oxygen blowing refining device 20 through the furnace side water outlet, and oxygen is introduced from the oxygen inlet 20.1 on the side of the oxygen blowing refining device 20 for oxygen blowing refining, and the silicon water quantitatively flows into the atomizer 21.1 in the atomization device through the water outlet channel of the oxygen blowing refining device 20. There are many types of atomization devices, such as centrifugal atomization, pressure atomization, ultrasonic atomization, gas atomization, rotary disk atomization, grid atomization, vortex atomization, medium atomization, etc. In this embodiment, high-speed centrifugal atomization is preferred, and the centrifugal atomizer 21.1 has a variety of structures, such as disc type, cup type, rotor type, etc. In this embodiment, the preferred structure is a disc type centrifugal atomizer 21.1. .1; The high-speed rotation of the disc centrifugal atomizer 21.1 makes the silicon water atomized into fine particles under the action of centrifugal force. The particle size can be adjusted according to the rotation speed and diameter of the centrifugal disc. The atomized silicon water droplets fall into the water cooling device 21.2 in the inert gas environment for heat exchange and condensation into solid particles, and further fall into the collection system 21.3 in the inert gas environment, and finally discharged through the opening and closing of the discharger under the collection system 21.3, and then further refined screening and other treatments are carried out according to market demand to meet different usage requirements; The atomization process for preparing industrial silicon powder has the advantages of high production efficiency, uniform powder particle size, high sphericity, good surface quality, environmental protection, low production cost, high degree of automation, etc., and eliminates multiple links such as ingot casting, cooling, crushing, and milling in the traditional smelting process.

[0043] like Fig. 9As shown, the flue gas system is connected to a micro-positive pressure balancing device, which includes a balancing cabinet 24, a water seal groove 16.5 is arranged at the bottom end of the balancing cabinet 24, a water seal buoy 26 is placed in the water seal groove 16.5, a counterweight block 27 is fixed on the top of the water seal buoy 26, the bottom end of the balancing cabinet 24 is connected to an air inlet pipe 28 and an air outlet pipe 29, a conical valve 30 is suspended at the inner top end of the water seal buoy 26, the conical valve 30 is located at the air outlet pipe 29, the air outlet pipe 29 is connected to a centrifugal fan 31, a water mist dust removal device is installed at the inlet of the centrifugal fan 31, and the air inlet pipe 28 is connected to the flue gas exhaust system 13 of the smelting furnace body 100 through a flue gas waste heat exchanger. As the ore-fired furnace operates, the gas generated in the furnace enters the water seal buoy 26 through the flue gas exhaust system 13. The pressure of the water seal buoy 26 gradually increases, pushing the water seal buoy 26 upward. At the same time, the conical valve 30 moves upward with the water seal buoy 26, opening the exhaust pipe, so that the gas in the water seal buoy 26 is smoothly discharged to the centrifugal separator. The dust-containing water flow enters the fan and further captures dust without dead angles under the stirring of high-speed blades. The flue gas passing through is cooled and dust-removed, and then treated by the centrifugal dehydrator 33 to obtain clean flue gas, which is sent to the internal combustion engine for power generation; the water obtained by the centrifugal dehydration is concentratedly treated with solids produced by the vacuum dehydration belt conveyor 34, and the reclaimed water is recycled. When the flow rate of exhaust flue gas increases or the gas discharge in the furnace decreases, the pressure of water seal float 26 decreases, and water seal float 26 moves downward. At the same time, the cone valve 30 moves downward with the water seal float 26 to reduce the flue gas discharge. The pressure of water seal float 26 gradually returns to normal, and the pressure in the furnace rises, so that the furnace reaches a dynamic equilibrium state and maintains a slight positive pressure.

[0044] The invention discloses a closed industrial silicon ore-burning furnace, which realizes the effects of high efficiency, low consumption, ultra-low emission and zero carbon emission as a whole. Compared with the traditional ore-burning furnace with high energy consumption and high emission, the invention realizes subversive, novel, creative and practical improvement.

[0045] The parameter comparison between the closed industrial silicon submerged arc furnace of the present invention and the traditional semi-closed submerged arc furnace is shown in the following table:

[0046]

[0047] It can be seen from the table that the 33,000 KVA closed industrial silicon ore-fired furnace of the present invention achieves ultra-low and zero carbon emissions, thereby increasing raw material yield, reducing smelting energy consumption, reducing emissions or achieving zero carbon emissions, and producing high added value.

[0048] The above is only one embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0049] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A closed industrial silicon ore-fired furnace, characterized in that: include: A furnace body (100) is provided with a water-cooled sealed smoke hood (9) device on the upper part of the furnace body (100).

2. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The water-cooled closed smoke hood (9) device is characterized in that 9 to 27 two-dimensional space motion tamping devices (16) are installed on the upper part; and 3 to 15 three-dimensional space motion tamping devices (19) are installed on the side.

3. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The silicon outlet of the furnace body (100) is connected to an oxygen blowing refining device (20), and then connected to a continuous silicon granulation device (21), so as to finally obtain a micron-grade powder material with controllable particle size.

4. A closed industrial silicon submerged arc furnace as claimed in claim 3, characterized in that: The water-cooled enclosed smoke hood (9) device is equipped with three or more preheating devices (16.2) on the top to prevent the flow of smoke and effectively absorb and block the conductive electrode holding tube from heat radiation. The side is equipped with no less than three explosion-proof inspection holes and industrial TV cameras. The enclosed smoke hood (9) is fixed on the upper platform, and the platform is supported by multiple columns.

5. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The upper platform is equipped with three or more insulated material distribution hoppers (15) for evenly distributing the preheating material device (16.2), and the upper part is respectively connected to the feed branch pipe from the bell valve and the insulated circumferential gas collecting pipe from the flue gas in the furnace.

6. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The gas collecting pipe is connected to the inlet of the waste heat boiler, the outlet of the waste heat boiler is connected to the inlet of the dust collector, the outlet of the dust collector is connected to the centrifugal fan (31), 10 or more water mist nozzles are arranged on the inlet pipe of the centrifugal fan (31) to further capture dust and cool it down, and then the fan blades are stirred to achieve dust capture and cooling without dead angles, the fan outlet is connected to the inlet of the centrifugal dehydrator (33), the outlet of the centrifugal dehydrator (33) is connected to the intake pipe (28) of the internal combustion engine, and the intake pipe (28) is externally connected with a differential pressure transmitter to achieve the closed ore-fired furnace flue gas system always operating safely at a micro-positive pressure, the water outlet of the centrifugal dehydrator (33) is connected to a vacuum dehydration belt conveyor (34), the solid waste after dehydration is centrally treated, and the reclaimed water is recycled.

7. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The feeding system (10) is composed of a furnace transformer and a low-voltage compensator, or a rectifier cabinet, or a variable-frequency flexible power supply and a secondary busbar, and a conductive copper tile. The conductive copper tile is surrounded by a chain hoop device and locked or released by a wedge block pushed by a hydraulic cylinder.

8. A closed industrial silicon submerged arc furnace as claimed in claim 1, characterized in that: The two-dimensional space motion furnace tamping device (16) is fixed on the upper platform, and a monorail trolley is installed on the upper part of the fixed track of the furnace tamping device. The trolley is equipped with a telescopic mechanism and can be moved to the position where the furnace tamping operation is required at any time. The monorail trolley may not be provided, and each furnace tamping device operates independently. The three-dimensional motion furnace tamping device (19) is installed on the side of the closed smoke hood (9), and two small oil cylinders fixed on the closed smoke hood (9) staggered by 90 degrees interactively drive the sleeve (19.3) to achieve 360-degree swing, and the telescopic furnace tamping rod in the sleeve (19.3) is superimposed to achieve the three-dimensional furnace tamping operation.

9. A closed industrial silicon submerged arc furnace as claimed in claim 3, characterized in that: When the system pressure drops, the float valve of the differential pressure transmitter automatically drops, partially closing the centrifugal fan (31) inlet, and vice versa. At the same time, the frequency converter is controlled by the output signal of the pressure sensor to achieve the speed change of the fan motor, thereby keeping the flue gas system differential pressure fluctuating within a certain value.

10. A closed industrial silicon submerged arc furnace as claimed in claim 6, characterized in that: After oxygen blowing and refining, the melt of the continuous silicon granulation device (21) is controlled by a needle valve and flows into an atomization device. The atomization device consists of a closed water-cooled shell with a cooling coil inside. The inside is filled with inert gas and a discharge valve is provided at the bottom.

11. A closed industrial silicon submerged arc furnace as claimed in claim 6, characterized in that: The chain hoop device is characterized in that it is similar to a tank chain rail that embraces a copper plate, with wedge-shaped sleeves interlaced at the joints, and wedge-shaped blocks inserted inside and driven by an oil cylinder to lock or loosen.

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