CN210180188U

CN210180188U - Positive-pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system

Info

Publication number: CN210180188U
Application number: CN201920587037.7U
Authority: CN
Inventors: 房守忠
Original assignee: Ningxia Sanyuan Zhongtai Metallurgical Co Ltd
Current assignee: Ningxia Sanyuan Zhongtai Metallurgical Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-03-24
Anticipated expiration: 2029-04-26

Abstract

A positive pressure discharging type submerged arc furnace smoke micro silicon powder recovery system comprises a submerged arc furnace, a waste heat boiler and a micro silicon powder recovery device, in the utility model, the micro silicon powder in a discharging pipeline is blown out by high-pressure airflow generated by a compressed air spray gun, the discharging pipeline is horizontally arranged, compared with a discharging pipe which is generally vertically arranged, the secondary pollution of the micro silicon powder dust during discharging is reduced, the micro silicon powder in the discharging pipeline is conveyed by high-pressure air sprayed out by the compressed air spray gun to be used as power, a certain positive pressure encryption effect is achieved, the secondary pollution of the micro silicon powder dust can be reduced to a certain degree, a separating box is arranged in a steel ball collecting device, a plurality of rows of racks which are staggered up and down on the separating box can enable the mixture of the dust and steel balls to enter gaps between the racks at random, and the steel balls and the dust are distributed among the plurality of rows of racks, the steel balls and the dust can be fully separated from top to bottom in the whole separation box, and the dust and the steel balls can be fully separated.

Description

Positive-pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system

Technical Field

The utility model relates to a waste heat boiler technical field, in particular to hot stove flue gas silica fume recovery system in malleation ejection of compact formula ore deposit.

Background

The ferrosilicon smelting smoke dust is considered to be smoke dust which seriously pollutes the environment, the submerged arc furnace for smelting ferrosilicon is generally divided into three furnace types, the first type is a fully-closed type, the second type is a semi-closed type with a short smoke hood, and the third type is an open type with a high smoke hood. The semi-closed furnace has large smoke volume, is suitable for heat exchange power generation by adopting a waste heat boiler, has the thermal efficiency of about 26-28 percent, but has the difficulty that the diameter of most dust in the smoke is 0.1-0.5 um, and the particles have different cohesiveness in different temperature areas and humidity and are very easy to adhere to the surfaces of a chimney, a flue and a metal pipe, so that the heat exchange efficiency of a heat exchange surface is reduced sharply. The publication number of the steel ball dust removal type submerged arc furnace waste heat boiler published by the Chinese intellectual property office is CN 101701775A. The invention adopts a steel ball scattering device arranged at the top of a furnace, a steel ball separating and collecting device is arranged below an ash hopper at the bottom of the furnace, the steel ball separating and collecting device conveys the collected steel balls to a steel ball conveying hopper, then the steel ball conveying hopper filled with the steel balls is conveyed to the position above the steel ball scattering device through a circulating type steel ball mechanical conveying device, the steel balls are poured into the steel ball scattering device through the steel ball conveying hopper through a mechanical unloading catch wheel, the steel ball scattering device scatters the steel balls into a waste heat boiler of an ore smelting furnace, and the dust removal is realized by knocking a heating surface through the steel balls with kinetic energy, however, the invention has the following defects: the steel ball separating and collecting device has poor separating effect on dust and steel balls, the dust removing efficiency is not high, the micro silicon powder in the smoke is collected by the bag-type dust remover, the micro silicon powder is very thin and light, and secondary pollution is easily caused if a conventional method is adopted, which is a problem to be further solved.

Disclosure of Invention

In view of the above, it is necessary to provide a positive pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system with good separation effect of dust and steel balls, which can prevent secondary pollution.

A positive-pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system comprises a submerged arc furnace, a waste heat boiler and a micro silicon powder recovery device, wherein the waste heat boiler comprises a boiler heating surface formed by a coiled pipe group, a boiler flue gas channel forming a sealed channel around the boiler heating surface, and a furnace bottom arranged at the bottom of the boiler flue gas channel, a steel ball collecting device is arranged at the furnace bottom, a flue gas discharge port of the submerged arc furnace is connected with an upper inlet of the waste heat boiler flue gas channel so as to convey high-temperature flue gas generated by the submerged arc furnace into the waste heat boiler flue gas channel, the steel ball collecting device comprises a separation box, a valve body, a valve core, an inclined flow pipe, a flexible connection, a first connecting rod, a second connecting rod, a third connecting rod and a balancing weight, the upper end and the lower end of the separation box are opened, the upper end of the separation box is opened with the lower, a plurality of rows of racks are arranged in the separation box from top to bottom, the racks are horizontally arranged columnar bodies, the racks between two adjacent rows are arranged in a staggered manner, one side of the separation box is provided with a smoke outlet, a screen is arranged on the smoke outlet, the screen mesh of the screen is smaller than the diameter of a steel ball, the upper end and the lower end of the valve body are open, the upper end opening of the valve body is connected with the lower end opening of the separation box, one side of the valve body is provided with a steel ball outlet, the steel ball outlet is connected with the inlet of an inclined flow pipe, the outlet of the inclined flow pipe is connected with the inlet of a flexible connection, the outer side wall of the valve core is hermetically connected with the inner side wall of the valve body, the valve core can linearly move up and down along the side wall of the valve body, the top wall of the valve core is obliquely designed, the top wall of the valve, the right end of the second connecting rod is provided with a balancing weight, the middle end of the second connecting rod is rotatably connected with the first rotating shaft, the upper end of the third connecting rod is hinged with the lower end of the first connecting rod, the lower end of the third connecting rod is a free end, the middle end of the third connecting rod is rotatably connected with the second rotating shaft, the micro silicon powder recovery device comprises a negative pressure fan, a bag-type dust collector, a cyclone separator, an ash collection tank and a positive pressure discharging assembly, the inlet of the negative pressure fan is connected with a smoke dust outlet, the outlet of the negative pressure fan is connected with the air inlet of the bag-type dust collector, the ash discharge port of the bag-type dust collector is connected with the air inlet of the cyclone separator through a pipeline, the exhaust port of the cyclone separator is connected with the inlet of the negative pressure fan through a pipeline, the cyclone separator is positioned at the top of the ash collection tank, the ash discharge port at the, the discharging pipeline is horizontally arranged, one end of the discharging pipeline is communicated with an inner cavity of the ash collecting tank, a valve is installed at the free end of the discharging pipeline, the bottom wall of the inner side of the discharging pipeline is arranged at the same level with the bottom of the inner side of the ash collecting tank, the positive-pressure discharging assembly comprises a compressed air spray gun, the inner side of the ash collecting tank is arranged in the compressed air spray gun, and a jet orifice of the compressed air spray gun is arranged in the direction of the discharging pipeline relative to the inlet of the free end of the discharging pipeline so as to blow out silicon micropowder of the ash collecting tank from the discharging pipeline through high-pressure gas.

Preferably, the waste heat boiler further comprises a boiler top arranged at the top of the boiler flue gas channel, a steel ball scattering device is arranged on the boiler top, the steel ball scattering device comprises a scattering and collecting hopper and a steel ball scattering and guiding device, and the steel ball scattering and guiding device is arranged below the scattering and collecting hopper and is connected with an output port of the scattering and collecting hopper; the steel ball scattering guide device comprises a cylindrical pipeline and at least three dispersion pipes; the upper end of the cylindrical pipeline is communicated with an output port of the scattering and collecting hopper, the lower end of the cylindrical pipeline is communicated with one end of each dispersion pipe, and the other ends of the three dispersion pipes are connected with the top of the boiler and communicated with a flue gas channel of the boiler so as to uniformly scatter the steel balls on the heated surface of the boiler.

Preferably, the exhaust-heat boiler further comprises a circulating steel ball conveying device, the circulating steel ball conveying device comprises a driving gear, three driven gears, double rows of chains, a steel ball conveying hopper, a horizontal correcting rod and a reverse rotating wheel, the driving gear and the three driven gears are sequentially arranged at four corners of the supporting frame, the double rows of chains are sequentially wound on the driving gear and the three driven gears to form a closed rectangular chain ring, the steel ball conveying hopper is hung between two chains of the double rows of chains, the steel ball conveying hopper can rotate around the rotating center of the double rows of chains in a vertical plane relatively, the steel ball conveying hoppers are uniformly distributed along the rectangular chain ring, the gravity center of the steel ball conveying hopper deviates to one side of the rotating center of the steel ball conveying hopper, so that the steel ball conveying hopper can restore the state that the opening end of the steel ball conveying hopper faces upwards by virtue of the gravity, and, the horizontal correcting rod is positioned above the horizontal section below the annular part of the rectangular chain, the horizontal correcting rod is horizontally arranged along the length direction of the horizontal section below the annular part of the rectangular chain, two ends of the horizontal correcting rod are bent upwards so as to enable the end surface of the open end of the steel ball conveying hopper on the horizontal section below the annular part of the rectangular chain to be horizontally moved close to the lower part of the horizontal correcting rod, a stirring piece is arranged on the steel ball conveying hopper, the steel ball conveying hopper on the horizontal section below the annular part of the rectangular chain moves rightwards, the stirring piece stirs the free end of the third connecting rod to rotate around a second rotating shaft so as to enable steel balls in a valve body to fall from a steel ball outlet and enter the steel ball conveying hopper through an inclined flow pipe and flexible connection in sequence, the reverse rotating wheel is positioned below the horizontal section above the annular part of the rectangular chain, the steel ball hopper on the horizontal section above the annular part of the rectangular chain moves, so that the steel ball transporting hopper rotates around the rotation center of the double-row chain relatively to the double-row chain, so that the steel balls in the steel ball transporting hopper are poured into the spreading and collecting hopper, and the bottom of the steel ball transporting hopper in a 90-degree reverse rotation state is higher than the top of the reverse rotation wheel, so that the steel ball transporting hopper runs leftwards.

The utility model discloses a be equipped with the separator box among the steel ball collection device, the multirow rack of crisscross setting from top to bottom of separator box enables behind the mixture entering separator box of dust and steel ball, steel ball and dust random access clearance between the rack, because steel ball and dust random distribution between multirow rack, this just can make steel ball and dust from the top abundant fraction open in whole separator box, be favorable to the dust to discharge from the smoke and dust export under negative-pressure air fan's effect, and the steel ball is because the relative dust of weight is very much, get into the valve body under the effect of gravity, dust and steel ball can the intensive separation.

The utility model discloses in, the little silica flour that the sack cleaner was collected utilizes negative-pressure air fan to carry to cyclone, then fall into the collection ash can, when the little silica flour in the collection ash can need unload, the high-pressure draught that utilizes the compressed air spray gun to produce aims at ejection of compact pipeline, blow off the little silica flour in the ejection of compact pipeline to appointed transportation container, ejection of compact pipeline level sets up, compare with the discharging pipe of vertical setting usually, the secondary pollution of little silica flour dust when having reduced the ejection of compact, the little silica flour of ejection of compact pipeline is carried and is regarded as power by compressed air spray gun blowout high-pressure air, certain malleation encrypted effect has, also can reduce the secondary pollution of little silica flour dust to a certain extent.

Drawings

Fig. 1 is a schematic structural diagram of the positive pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system.

FIG. 2 is a partially enlarged view showing the installation position of the positive pressure discharging component in the ash collecting tank.

Fig. 3 is a schematic structural diagram of the waste heat boiler.

FIG. 4 is a schematic structural view of the steel ball collecting device.

In the figure: the waste heat boiler comprises a waste heat boiler 10, a steel ball collecting device 11, a separating box 111, a rack 1111, a smoke outlet 1112, a valve body 112, a steel ball outlet 1121, a valve core 113, an inclined flow pipe 114, a flexible connection 115, a first connecting rod 116, a second connecting rod 117, a first rotating shaft 1171, a third connecting rod 118, a second rotating shaft 1181, a counterweight 119, a steel ball scattering device 12, a scattering and collecting hopper 121, a steel ball scattering and guiding device 122, a cylindrical pipeline 1221, a dispersing pipe 1222, a circulating type steel ball conveying device 13, a driving gear 131, a driven gear 132, a double-row chain 133, a steel ball conveying hopper 134, a stirring piece 1341, a horizontal correcting rod 135, a reverse rotating wheel 136, a submerged arc furnace 20, a micro silicon powder recycling device 30, a negative pressure fan 31, a bag dust collector 32, a cyclone separator 33, an ash collecting tank 34, a discharging pipeline 341, a positive pressure discharging.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1 to 4, an embodiment of the present invention provides a positive pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system, including a submerged arc furnace 20, a waste heat boiler 10, and a micro silicon powder recovery device 30, wherein the waste heat boiler 10 includes a boiler heating surface formed by a serpentine pipe group, a boiler flue gas channel forming a sealed channel around the boiler heating surface, and a furnace bottom arranged at the bottom of the boiler flue gas channel, the furnace bottom is provided with a steel ball collecting device 11, a flue gas discharge port of the submerged arc furnace 20 is connected with an upper inlet of the flue gas channel of the waste heat boiler 10, so as to convey high temperature flue gas generated by the submerged arc furnace 20 into the flue gas channel of the submerged arc furnace 10, the steel ball collecting device 11 includes a separation box 111, a valve body 112, a valve core 113, a diagonal flow pipe 114, a flexible connection 115, a first connecting rod 116, a second connecting rod 117, a third connecting rod 118, and a counterweight 119, the upper and lower end openings, so that a steel ball smoke dust mixture in a smoke channel enters a separation box 111, a plurality of rows of racks 1111 are arranged in the separation box 111 from top to bottom, the racks 1111 are horizontally arranged columnar bodies, the racks 1111 between two adjacent rows are arranged in a staggered manner, a smoke outlet 1112 is arranged on one side of the separation box 111, a screen mesh is arranged on the smoke outlet 1112, the mesh of the screen mesh is smaller than the diameter of a steel ball, the upper end and the lower end of a valve body 112 are open, the upper end opening of the valve body 112 is connected with the lower end opening of the separation box 111, a steel ball outlet 1121 is arranged on one side of the valve body 112, the steel ball outlet 1121 is connected with an inlet of an oblique flow pipe 114, an outlet of the oblique flow pipe 114 is connected with an inlet of a flexible connection 115, the outer side wall of a valve core 113 is hermetically connected with the inner side wall of the valve body 112, the valve core 113 can linearly move, The second rotating shaft 1181 is fixed at the furnace bottom, the upper end of the first connecting rod 116 is hinged with the valve core 113, the left end of the second connecting rod 117 is hinged with the middle end of the first connecting rod 116, the right end of the second connecting rod 117 is provided with a balancing weight 119, the middle end of the second connecting rod 117 is rotatably connected with the first rotating shaft 1171, the upper end of the third connecting rod 118 is hinged with the lower end of the first connecting rod 116, the lower end of the third connecting rod 118 is a free end, the middle end of the third connecting rod 118 is rotatably connected with the second rotating shaft 1181, the micro silicon powder recovery device 30 comprises a negative pressure fan 31, a bag-type dust collector 32, a cyclone separator 33, an ash collecting tank 34 and a positive pressure discharging component 35, the inlet of the negative pressure fan 31 is connected with a smoke outlet 1112, the outlet of the negative pressure fan 31 is connected with the air inlet of the bag-type dust collector 32, the ash discharging port of the bag-type dust collector 32 is connected with the air, cyclone 33 is located the top of collection ash can 34, the row's ash mouth and the entry linkage at collection ash can 34 top of cyclone 33 bottom, the outside of collection ash can 34 is provided with ejection of compact pipeline 341, ejection of compact pipeline 341 level sets up, the one end of ejection of compact pipeline 341 and the inner chamber intercommunication of collection ash can 34, the valve is installed to the free end of ejection of compact pipeline 341, the inboard diapire of ejection of compact pipeline 341 and the same level setting in the inboard bottom of collection ash can 34, malleation ejection of compact subassembly 35 includes compressed air spray gun 351, place collection ash can 34 inboard in the compressed air spray gun 351, the directional direction of ejection of compact pipeline 341 of compressed air spray gun 351 sets up rather than the direction of its free end entry to the silica fume that the jet orifice of compressed air spray gun 361 spouts the silica fume of collection ash can 34 from ejection of compact pipeline 341 through the high-.

In this embodiment, the steel balls enter the flue gas channel from the upper portion of the flue gas channel, and dust adhered to the inner wall of the flue gas channel falls off under the impact of the steel balls and then enters the separation box 111 along with the steel balls.

Referring to fig. 2, the lower end of the flexible connection 115 naturally falls, the lower end of the flexible connection 115 directly extends into the bottom of the container, the third link 118 is rotated, the first link 116 is pulled downward, the valve element 113 slides downward along the inner wall of the valve body 112, the valve element 113 reaches below the steel ball outlet 1121, the steel ball enters the steel ball outlet 1121, then enters the flexible connection 115 through the oblique flow tube 114, and then enters the container for containing the steel ball, and the steel ball output by the flexible connection 115 can be very conveniently prevented from jumping out of the container for containing the steel ball.

Referring to fig. 2, when the third connecting rod 118 is rotated without an external force, the second connecting rod 117 is rotated by the weight 119, the first connecting rod 116 is pushed upward, the valve core 113 slides upward along the inner wall of the valve body 112, and the valve core 113 blocks the steel ball outlet 1121.

And lifting the container containing the steel balls to the waste heat boiler 10, and pouring the steel balls into the flue gas channel of the waste heat boiler 10 for ash removal again.

The utility model discloses a be equipped with separator box 111 among the steel ball collection device 11, separator box 111 is last and after the mixture that multirow rack 1111 of crisscross setting down enabled dust and steel ball got into separator box 111, steel ball and dust random access clearance between rack 1111, because steel ball and dust random distribution between multirow rack 1111, this just enables steel ball and dust from the top abundant fraction open in whole separator box 111, be favorable to the dust to discharge from smoke outlet 1112 under negative-pressure air fan 31's effect, and the steel ball is because the relative dust of weight is big very much, get into valve body 112 under the effect of gravity, dust and steel ball can fully separate.

The utility model discloses in, the little silica flour that collects through sack cleaner 32 utilizes negative-pressure air fan 31 to carry to cyclone 33, then fall into collection ash can 34, when the little silica flour in collection ash can 34 need unload, the high-pressure draught that utilizes compressed air spray gun 351 to produce aims at ejection of compact pipeline 341, blow off the little silica flour in the ejection of compact pipeline 341 to appointed transportation container, ejection of compact pipeline 341 level sets up, compare with the discharging pipe of vertical setting usually, the secondary pollution of little silica flour dust when having reduced the ejection of compact, the little silica flour of ejection of compact pipeline 341 is carried and is regarded as power by compressed air spray gun 351 blowout high-pressure air, certain malleation encrypted effect has, also can reduce the secondary pollution of little silica flour dust to a certain extent.

In this embodiment, the transport container can be the removal feed bin, and the removal feed bin passes through quick-operation joint and can dismantle sealing connection with ejection of compact pipeline 341, and the inner chamber of removing the feed bin can also communicate with the entry of negative pressure pump.

In this embodiment, the cyclone separator 33 is connected to the negative pressure fan 31, and the cyclone separator 33 does not need to be separately equipped with the negative pressure fan 31 as a power source, and moreover, some micro silicon powder inevitably flows out from the exhaust port of the cyclone separator 33 after entering the micro silicon powder in the cyclone separator 33, and then enters the bag-type dust collector 32 through the negative pressure fan 31, so that environmental pollution is avoided, and loss of the micro silicon powder is also avoided.

Referring to fig. 1, further, the exhaust-heat boiler 10 further includes a boiler top disposed at the top of the flue gas channel of the boiler, a steel ball scattering device 12 is disposed on the boiler top, the steel ball scattering device 12 includes a scattering and collecting hopper 121 and a steel ball scattering and guiding device 122, the steel ball scattering and guiding device 122 is disposed below the scattering and collecting hopper 121 and connected to an output port of the scattering and collecting hopper 121; the steel ball scattering guide 122 includes a cylindrical pipe 1221 and at least three dispersion pipes 1222; the upper end of a cylindrical pipeline 1221 is communicated with an output port of the scattering and collecting hopper 121, the lower end of the cylindrical pipeline 1221 is communicated with one end of each dispersing pipe 1222, and the other ends of the three dispersing pipes 1222 are connected with the top of the boiler and communicated with a flue gas channel of the boiler so as to uniformly scatter steel balls on the heating surface of the boiler.

Referring to fig. 1, further, the exhaust-heat boiler 10 further includes a circulating steel ball conveying device 13, the circulating steel ball conveying device 13 includes a driving gear 131, three driven gears 132, a double-row chain 133, a steel ball transporting hopper 134, a horizontal correcting rod 135, a reverse rotating wheel 136, the driving gear 131 and the three driven gears 132 are sequentially arranged at four corners of the supporting frame, the double-row chain 133 is sequentially wound around the driving gear 131 and the three driven gears 132 to form a closed rectangular chain ring, a steel ball transporting hopper 134 is hung between two chains of the double-row chain 133, the steel ball transporting hopper 134 can rotate around its rotation center in a vertical plane relative to the double-row chain 133, a plurality of steel ball transporting hoppers 134 are uniformly distributed along the rectangular chain ring, the gravity center of the steel ball transporting hopper 134 is deviated to one side of its rotation center to make the steel ball transporting hopper 134 restore its open end upward state, the horizontal correction rod 135 and the reverse turning wheel 136 are both fixedly arranged on the supporting frame, the horizontal correction rod 135 is positioned above the horizontal section below the annular lower part of the rectangular chain, the horizontal correction rod 135 is horizontally arranged along the length direction of the horizontal section below the annular lower part of the rectangular chain, two ends of the horizontal correction rod 135 are bent upwards so as to enable the end surface of the open end of the steel ball conveying hopper 134 on the horizontal section below the annular lower part of the rectangular chain to be clung to the lower part of the horizontal correction rod 135 to move horizontally, a stirring part 1341 is arranged on the steel ball conveying hopper 134, the steel ball conveying hopper 134 on the horizontal section below the annular lower part of the rectangular chain runs rightwards, the stirring part 1341 stirs the free end of the third connecting rod 118 to rotate around the second rotating shaft 1181 so as to enable steel balls in the valve body 112 to fall down from the steel ball outlet 1121 and enter the steel ball conveying hopper 134 through the inclined flow pipe 114 and the soft connection 115 in sequence, the, the top of the inversion wheel 136 is higher than the bottom of the ball transporting hopper 134 to block the ball transporting hopper 134 from moving leftward so that the ball transporting hopper 134 rotates about its rotational center with respect to the double row chain 133 to dump the balls in the ball transporting hopper 134 into the scattering collecting hopper 121, and the bottom of the ball transporting hopper 134 in the 90 ° inverted state is higher than the top of the inversion wheel 136 so that the ball transporting hopper 134 moves leftward.

The embodiment of the utility model provides a module or unit in the device can merge, divide and delete according to actual need.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a hot stove flue gas silica fume recovery system in malleation ejection of compact formula ore deposit which characterized in that: the device comprises an ore-smelting furnace, a waste heat boiler and a micro silicon powder recovery device, wherein the waste heat boiler comprises a boiler heating surface consisting of a serpentine pipe group, a boiler flue gas channel forming a sealed channel around the boiler heating surface, and a furnace bottom arranged at the bottom of the boiler flue gas channel, a steel ball collecting device is arranged at the furnace bottom, a flue gas discharge port of the ore-smelting furnace is connected with an upper inlet of the waste heat boiler flue gas channel so as to convey high-temperature flue gas generated by the ore-smelting furnace into the waste heat boiler flue gas channel, the steel ball collecting device comprises a separation box, a valve body, a valve core, an inclined flow pipe, a flexible connection, a first connecting rod, a second connecting rod, a third connecting rod and a balancing weight, the upper end and the lower end of the separation box are open, so that a steel ball mixture in the flue gas channel enters the separation box, a plurality of rows of racks are arranged from top to bottom in, the racks between two adjacent rows are arranged in a staggered manner, a smoke outlet is arranged on one side of the separation box, a screen mesh is arranged on the smoke outlet, the sieve mesh of the screen mesh is smaller than the diameter of a steel ball, the upper end and the lower end of the valve body are open, the upper end opening of the valve body is connected with the lower end opening of the separation box, a steel ball outlet is arranged on one side of the valve body and is connected with the inlet of an oblique flow pipe, the outlet of the oblique flow pipe is connected with the inlet of a flexible connection, the outer side wall of a valve core is hermetically connected with the inner side wall of the valve body, the valve core can move linearly up and down along the side wall of the valve body, the top wall of the valve core is designed in an inclined manner, the top wall of the valve core extends towards one side of the steel ball outlet, a first rotating shaft and a second rotating shaft are fixed at the bottom of, the upper end of a third connecting rod is hinged with the lower end of the first connecting rod, the lower end of the third connecting rod is a free end, the middle end of the third connecting rod is rotatably connected with a second rotating shaft, the micro silicon powder recovery device comprises a negative pressure fan, a bag-type dust collector, a cyclone separator, an ash collecting tank and a positive pressure discharging component, the inlet of the negative pressure fan is connected with a smoke outlet, the outlet of the negative pressure fan is connected with the air inlet of the bag-type dust collector, the ash discharge port of the bag-type dust collector is connected with the air inlet of the cyclone separator through a pipeline, the exhaust port of the cyclone separator is connected with the inlet of the negative pressure fan through a pipeline, the cyclone separator is positioned at the top of the ash collecting tank, the ash discharge port at the bottom of the cyclone separator is connected with the inlet at the top of the ash collecting tank, a discharge pipeline is arranged on the outer side of the ash collecting tank, one end of the, the inboard diapire of ejection of compact pipeline sets up with the inboard bottom same level of collection ash can, and malleation ejection of compact subassembly includes the compressed air spray gun, place collection ash can inboard in the compressed air spray gun in, the directional direction setting of ejection of compact pipeline relative its free end entry of compressed air spray gun's jet to the little silica flour that blows off collection ash can from ejection of compact pipeline through compressed air spray gun jet spun high-pressure gas.

2. The positive pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system as set forth in claim 1, characterized in that: the waste heat boiler also comprises a boiler top arranged at the top of the boiler flue gas channel, a steel ball scattering device is arranged at the boiler top, the steel ball scattering device comprises a scattering and collecting hopper and a steel ball scattering and guiding device, and the steel ball scattering and guiding device is arranged below the scattering and collecting hopper and is connected with an output port of the scattering and collecting hopper; the steel ball scattering guide device comprises a cylindrical pipeline and at least three dispersion pipes; the upper end of the cylindrical pipeline is communicated with an output port of the scattering and collecting hopper, the lower end of the cylindrical pipeline is communicated with one end of each dispersion pipe, and the other ends of the three dispersion pipes are connected with the top of the boiler and communicated with a flue gas channel of the boiler so as to uniformly scatter the steel balls on the heated surface of the boiler.

3. The positive pressure discharging type submerged arc furnace flue gas micro silicon powder recovery system as set forth in claim 2, characterized in that: the waste heat boiler also comprises a circulating type steel ball conveying device, the circulating type steel ball conveying device comprises a driving gear, three driven gears, double rows of chains, a steel ball conveying hopper, a horizontal correcting rod and a reverse rotating wheel, the driving gear and the three driven gears are sequentially arranged at four corners of the supporting frame, the double rows of chains are sequentially wound on the driving gear and the three driven gears to form a closed rectangular chain ring, the steel ball conveying hopper is hung between two chains of the double rows of chains, the steel ball conveying hopper can rotate around the rotating center of the steel ball conveying hopper in a vertical plane relatively, the steel ball conveying hoppers are uniformly distributed along the rectangular chain ring, the gravity center of the steel ball conveying hopper deviates to one side of the rotating center of the steel ball conveying hopper, so that the steel ball hopper conveying hopper can restore the state that the opening end of the steel ball hopper faces upwards by virtue of the gravity, the horizontal correcting rod and the reverse rotating wheel are fixedly arranged on, the horizontal correcting rod is horizontally arranged along the length direction of the horizontal section below the annular part of the rectangular chain, two ends of the horizontal correcting rod are bent upwards to enable the end surface of the open end of the steel ball conveying hopper on the horizontal section below the annular part of the rectangular chain to be tightly attached to the lower part of the horizontal correcting rod to move horizontally, a stirring part is arranged on the steel ball conveying hopper, the steel ball conveying hopper on the horizontal section below the annular part of the rectangular chain moves rightwards, the stirring part stirs the free end of the third connecting rod to rotate around a second rotating shaft, so that steel balls in a valve body fall down from a steel ball outlet and enter the steel ball conveying hopper through an inclined flow pipe and a flexible connection in sequence, the reverse rotating wheel is positioned below the horizontal section above the annular part of the rectangular chain, the steel ball conveying hopper on the horizontal section above the annular part of the rectangular chain moves leftwards, the top of the reverse rotating wheel is higher than the bottom of the steel ball conveying hopper, so that the steel balls in the steel ball conveying hopper are poured into the spreading and collecting hopper, and the bottom of the steel ball conveying hopper in a 90-degree reverse rotation state is higher than the top of the reverse rotation wheel, so that the steel ball conveying hopper runs leftwards.