CN110057202B - Non-stop submerged arc furnace flue gas micro silicon powder recovery system - Google Patents
Non-stop submerged arc furnace flue gas micro silicon powder recovery system Download PDFInfo
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- CN110057202B CN110057202B CN201910345387.7A CN201910345387A CN110057202B CN 110057202 B CN110057202 B CN 110057202B CN 201910345387 A CN201910345387 A CN 201910345387A CN 110057202 B CN110057202 B CN 110057202B
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- steel ball
- center
- valve body
- air outlet
- flue gas
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 239000003546 flue gas Substances 0.000 title claims abstract description 85
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000011863 silicon-based powder Substances 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 105
- 239000002918 waste heat Substances 0.000 claims abstract description 35
- 239000004744 fabric Substances 0.000 claims abstract description 33
- 238000007664 blowing Methods 0.000 claims abstract description 26
- 230000001360 synchronised effect Effects 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 159
- 239000010959 steel Substances 0.000 claims description 159
- 238000000926 separation method Methods 0.000 claims description 61
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 18
- 229910021487 silica fume Inorganic materials 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 15
- 238000009331 sowing Methods 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 14
- 239000003517 fume Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003500 flue dust Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/005—Systems for reclaiming waste heat including pyrolising the waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a non-stop submerged arc furnace flue gas micro silicon powder recovery system, which comprises an incinerator, a waste heat boiler, a micro silicon powder separator, a negative pressure fan and a synchronous back-blowing dust removing device, wherein the synchronous back-blowing dust removing device comprises a disc conversion valve, a first cloth bag dust remover, a second cloth bag dust remover and a third cloth bag dust remover.
Description
Technical Field
The invention relates to the technical field of waste heat boilers, in particular to a non-stop submerged arc furnace flue gas micro silicon powder recovery system.
Background
The waste heat power generation technology takes full use of industrial waste heat and realizes 'cogeneration' as a remarkable characteristic, can achieve the dual purposes of emission reduction and income increase, and is the best scheme and the best energy saving mode for scientific conversion of the industrial waste heat. The submerged arc furnace is generally divided into three furnace types, wherein the first type is a totally-enclosed type, the second type is a short smoke hood semi-enclosed type, and the third type is a high smoke hood open type. The semi-closed furnace has larger flue gas quantity, is suitable for heat exchange power generation by adopting a waste heat boiler, has the thermal efficiency reaching about 26-28 percent, has the difficulty that most of dust in flue gas has the diameter of 0.1-0.5 um, and the particles have different cohesiveness under different temperature areas and humidity, are very easy to adhere to the surfaces of a chimney, a flue and a metal pipe, and lead to the rapid reduction of the heat exchange efficiency of a heat exchange surface. The steel ball dust removing type submerged arc furnace waste heat boiler published by the intellectual property office of China is disclosed as having a publication number of CN101701775A. The invention adopts a steel ball scattering device arranged at the top of a furnace, a steel ball separation and collection device is arranged below a furnace bottom ash bucket, the steel ball separation and collection device conveys collected steel balls into a steel ball conveying bucket, then the steel ball conveying bucket filled with steel balls is conveyed to the upper part of the steel ball scattering device through a circulating steel ball mechanical conveying device, the steel ball conveying bucket is enabled to pour the steel balls into the steel ball scattering device through a mechanical discharging baffle wheel, the steel ball scattering device is used for scattering the steel balls into a waste heat boiler of an ore heating furnace, and thus dust removal is realized through the beating of the steel balls with kinetic energy on a heating surface. However, this invention has the following disadvantages: the steel ball separating and collecting device has poor separating effect on dust and steel balls and low dust removal efficiency. When more than two submerged arc furnaces share one waste heat boiler, the exhaust gas quantity of different submerged arc furnaces is unstable, so that the working condition of the waste heat boiler is unstable, the effect of waste heat utilization is affected, carbon monoxide contained in the flue gas is directly exhausted to amplify the gas, the environment is polluted, and the energy resource is wasted. The research and the utilization of the byproduct micro silicon powder recovered from the flue gas prove to be a valuable commodity, and the recovery of the micro silicon powder mostly adopts a bag-type dust remover, and the bag-type dust remover needs back blowing after being used for a period of time to recover the re-dedusting capability, and frequent back blowing operation causes production interruption to influence the normal production.
Disclosure of Invention
In view of the above, it is necessary to provide a flue gas silica fume recovery system for a non-stop submerged arc furnace, which can effectively utilize carbon monoxide in flue gas and separate dust and steel balls.
The utility model provides a do not shut down submerged arc furnace flue gas silica fume recovery system, including incinerator, exhaust-heat boiler, silica fume separator, negative pressure fan, synchronous blowback dust collector, the incinerator has a confined hemisphere furnace body, the left end face of furnace body is circular plane, there are a plurality of flue gas split inlets on the left end face, each flue gas split inlet corresponds to the high temperature flue gas discharge port connection of a submerged arc furnace, right-hand member face that is opposite to the left end face is the hemisphere, right-hand member face center has a flue gas summary mouth, flue gas summary mouth is connected with the upper end entry of exhaust-heat boiler's flue gas passageway, the left end face of furnace body still has an air inlet, make carbon monoxide in the high temperature flue gas that gets into the furnace body and oxygen combustion in the air produce carbon dioxide, the heat that carbon monoxide combustion released is carried to exhaust-heat boiler, the exhaust-heat boiler includes the boiler heating surface that is formed by the snakelike nest of tube, form a sealing channel's boiler flue gas passageway around the boiler heating surface, the stove bottom of flue gas passageway bottom setting up, the steel ball collection device, the collection device includes the separator box, the valve body, the case, the valve core, the oblique, soft connection, first, the second, the top and bottom of the separator box, the cylinder top and the top and bottom of the separator box are provided with the cylinder-shaped sieve openings, the top and the cylinder-shaped top and bottom separator box are arranged in the cylinder-shaped top and the sieve openings are connected with the top and bottom, the cylinder-shaped separator box, the sieve openings are arranged in the diameter, the sieve openings, and the sieve top is open and the top is arranged in the cylinder top and the top and bottom, and bottom. The valve body is provided with a steel ball outlet at one side, the steel ball outlet is connected with an inlet of an inclined flow pipe, the outlet of the inclined flow pipe is connected with a soft connected inlet, the outer side wall of a valve core is in sealing connection with the inner side wall of the valve body, the valve core can move vertically and linearly along the side wall of the valve body, the top wall of the valve core is obliquely designed, the top wall of the valve core extends obliquely to one side of the steel ball outlet, a first rotating shaft and a second rotating shaft are fixed on a furnace bottom, the upper end of the first connecting rod is hinged with the valve core, the left end of the second connecting rod is hinged with the middle end of the first connecting rod, the right end of the second connecting rod is provided with a balancing weight, the middle end of the second connecting rod is in rotating connection with the first rotating shaft, the upper end of the third connecting rod is in rotating connection with the second rotating shaft, the middle end of the third connecting rod is in rotating connection with the second rotating shaft, the smoke outlet is connected with the inlet of a microsilica separator, the outlet of the microsilica negative pressure fan is connected with the inlet of the microshutter, the synchronous back-blowing dust removing device comprises a disc switching valve, a first cloth bag dust remover, a second dust remover and a third cloth bag dust remover, the third dust remover, the disc switching valve body comprises a first dust collector and a circular dust remover, the first dust remover and a third dust remover, the valve body and the dust remover are respectively provided with the same diameter as the air inlet and the air inlet, the first dust remover, the second dust remover and the third dust remover are respectively. The left round end face of the valve body is also provided with a first blowback mouth, a second blowback mouth and a third blowback mouth, the diameters of the first blowback mouth, the second blowback mouth and the third blowback mouth are the same, the first blowback mouth, the second blowback mouth and the third blowback mouth are uniformly distributed by the circle center of the left end face, the first blowback mouth, the second blowback mouth and the third blowback mouth are respectively connected with the air inlets of the first bag dust collector, the second bag dust collector and the third bag dust collector through pipelines, the center of the first air outlet, the center of the first blowback mouth and the circle center of the left end face of the valve body are collinear, the distance from the center of the first blowback mouth to the circle center of the left end face of the valve body is smaller than the distance from the center of the first air outlet to the circle center of the left end face of the valve body, the 8-shaped rotary cover is internally arranged in the valve body, the 8-shaped rotary cover is provided with a large end cover and a small end cover, the large end cover and the small end cover are circular, the small end cover is provided with a communication port, the large end cover and the left end face of the valve body are coaxially arranged, the 8-shaped rotary cover is driven by a stepping motor to rotate relative to the valve body, the center of the large end cover, the center of the communication port and the center of the small end cover are collinear, the communication port is positioned between the large end cover and the small end cover, the diameter of the large end cover is larger than the distance from the center of the first blowback port to the center of the left end face of the valve body, the diameter of the large end cover is smaller than the distance from the center of the first air outlet to the center of the left end face of the valve body, the diameter of the small end cover is larger than the diameter of the first air outlet, the distance from the center of the small end cover to the center of the left end face of the valve body is equal to the distance from the center of the left end face of the first blowback port to the left end face of the valve body.
Preferably, the silica fume separator comprises a separation cylinder body and an air outlet pipe, wherein the inner cavity of the separation cylinder body is a closed space, the upper section of the separation cylinder body is a cylinder body, the lower section of the separation cylinder body is a cone body, the upper part of the separation cylinder body is provided with a left air inlet and a right air inlet, the left air inlet and the right air inlet are identical in structure, the left air inlet and the right air inlet are uniformly distributed along the annular wall of the separation cylinder body, the left air inlet and the right air inlet are vertically arranged, so that high-temperature fume enters the inner cavity of the upper section of the separation cylinder body in a tangential reverse horizontal manner of the upper section of the separation cylinder body, the air inlet directions of the left air inlet and the right air inlet are identical, the top of the separation cylinder body is provided with the air outlet pipe, the upper end of the air outlet pipe is exposed out of the separation cylinder body, the lower end of the air outlet pipe extends towards the lower section of the separation cylinder body, the fume outlet is connected with the left air inlet and the right air inlet, and the port of the upper end of the air outlet pipe is connected with the inlet of the negative pressure fan.
Preferably, the ratio of the pipe diameter of the air outlet pipe to the pipe diameter of the upper section of the separation cylinder is 2, the ratio of the height value of the left air inlet to the width value of the left air inlet is 2, and the ratio of the height value of the separation cylinder to the height value of the lower section of the separation cylinder is 2.
Preferably, the waste heat boiler further comprises a furnace top arranged at the top of the boiler flue gas channel, the furnace top is provided with a steel ball scattering device, the steel ball scattering device comprises a scattering collecting hopper and a steel ball scattering guiding device, and the steel ball scattering guiding device is arranged below the scattering collecting hopper and is connected with an output port of the scattering collecting hopper; the steel ball scattering guide device comprises a cylindrical pipeline and at least three dispersing pipes; the upper end of the cylindrical pipeline is communicated with the output port of the sowing collection hopper, the lower end of the cylindrical pipeline is communicated with one end of each dispersing pipe, and the other ends of the three dispersing pipes are connected with the furnace top and communicated with the boiler flue gas channel so as to uniformly sowing steel balls on the heating surface of the boiler.
Preferably, the waste 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 bucket, a horizontal correcting rod and a reversing wheel, wherein 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 bucket is hung between the two chains of the double rows of chains, the steel ball conveying bucket can rotate in a vertical plane around the rotation center of the double rows of chains relatively to the double rows of chains, the steel ball conveying buckets are uniformly distributed along the rectangular chain ring, the gravity centers of the steel ball conveying buckets are deviated to one side of the rotation center of the steel ball conveying bucket, so that the steel ball conveying bucket is recovered to an upward state of the opening end of the steel ball conveying bucket by means of self weight, the horizontal correcting rod and the reversing wheel are fixedly arranged on the supporting frame, the horizontal correction rod is positioned above the lower horizontal section of the rectangular chain ring, the horizontal correction rod is horizontally arranged along the length direction of the lower horizontal section of the rectangular chain ring, the two ends of the horizontal correction rod are bent upwards to enable the end face of the opening end of the steel ball conveying hopper on the lower horizontal section of the rectangular chain ring to be horizontally moved close to the lower side of the horizontal correction rod, a stirring piece is arranged on the steel ball conveying hopper, the steel ball conveying hopper on the lower horizontal section of the rectangular chain ring moves rightwards, the stirring piece stirs the free end of the third connecting rod to rotate around the second rotating shaft so as to enable steel balls in the valve body to fall from the steel ball outlet and sequentially pass through the inclined flow pipe and the flexible connection to enter the steel ball conveying hopper, the reversing wheel is positioned below the upper horizontal section of the rectangular chain ring, the steel ball conveying hopper on the upper horizontal section of the rectangular chain ring moves leftwards, the top of the reversing wheel is higher than the bottom of the steel ball conveying hopper so as to stop the steel ball conveying hopper from moving leftwards, so that the steel ball conveying bucket rotates around the rotation center of the steel ball conveying bucket relative to the double-row chain, steel balls in the steel ball conveying bucket are poured into the sowing collecting bucket, and the bottom of the steel ball conveying bucket in a 90-degree reversing state is higher than the top of the reversing wheel, so that the steel ball conveying bucket moves leftwards.
The steel ball collecting device is provided with the separating box, the plurality of rows of racks which are arranged on the separating box in a staggered way from top to bottom can lead the mixture of dust and steel balls to enter the separating box, and then the steel balls and dust enter gaps among the racks at random.
In the invention, after the high-temperature flue gas generated by the submerged arc furnace enters the incinerator, carbon monoxide in the high-temperature flue gas is combusted with oxygen in air from the air inlet to produce carbon dioxide, so that the emission of carbon monoxide gas is reduced, and the heat generated after the carbon monoxide gas is combusted is sent to the waste heat boiler, so that the chemical energy in the high-temperature flue gas is converted into heat energy, and the heat energy is fully utilized.
According to the invention, the pressure of the high-temperature flue gas generated by different submerged arc furnaces is different, when the high-temperature flue gas of different submerged arc furnaces enters the incinerator, the incinerator plays a role of a buffer tank, so that the pressure of the high-temperature flue gas in the incinerator is uniform, the pressure of the high-temperature flue gas in the incinerator is stable, and the high-temperature flue gas enters the waste heat boiler after the pressure of the incinerator is stable, so that the heated surface of the waste heat boiler is heated uniformly, and the working condition of the waste heat boiler is stable.
In the invention, high-temperature flue gas enters the incinerator from the flue gas diversion inlet and flows out of the incinerator from the flue gas collection port, and as the furnace chamber of the incinerator is spherical, a curved surface furnace chamber which is approximately conical is formed from the flue gas diversion inlet to the flue gas collection port, the furnace chamber is in smooth transition, thereby reducing the vortex and turbulence energy of the high-temperature flue gas of the incinerator, reducing the air extraction energy consumption, improving the charging efficiency in the incinerator and improving the carbon monoxide combustion efficiency.
In the invention, the air inlet of the incinerator and the smoke diversion inlet are arranged in the same flow direction, and carbon monoxide and air in the incinerator flow in the same direction, so that the time of full contact is increased.
The disc transfer valve provided by the invention can ensure that one cloth bag dust collector is always in a back blowing state, and the other two cloth bag dust collectors are always in a dust removing state, so that the back blowing of the cloth bag dust collectors is realized without stopping, and the interruption of production caused by back blowing is avoided.
Drawings
FIG. 1 is a schematic structural view of the non-stop submerged arc furnace flue gas silica fume recovery system.
Fig. 2 is a longitudinal sectional view of the disc changer valve.
Fig. 3 is a longitudinal section of the valve body.
Fig. 4 is a schematic structural view of the rotary cover.
Fig. 5 is a schematic structural view of the waste heat boiler.
Fig. 6 is a schematic structural view of the steel ball collecting device.
In the figure: waste heat boiler 10, steel ball collecting device 11, separator 111, rack 1111, smoke outlet 1112, valve body 112, steel ball outlet 1121, valve core 113, diagonal flow pipe 114, flexible connection 115, first link 116, second link 117, first rotational shaft 1171, third link 118, second rotational shaft 1181, counterweight 119, steel ball scattering device 12, scattering collecting hopper 121, steel ball scattering guiding device 122, cylindrical pipe 1221, dispersion pipe 1222, circulating steel ball conveying device 13, driving gear 131, driven gear 132, double row chain 133, steel ball conveying hopper 134, toggle piece 1341, horizontal correction rod 135, counter-rotating wheel 136, incinerator 20 furnace body 21, flue gas diversion inlet 211, flue gas collection port 212, air inlet 213, micro silicon powder separator 30, separation cylinder 31, left air inlet 311, right air inlet 312, air outlet pipe 32, submerged arc furnace 40, negative pressure fan 50, synchronous back-blowing dust collector 60, disc switching valve 61, valve body 611, total air inlet 6111, first air outlet 6112, second air outlet 6113, third air outlet 6114, first back-blowing port 6115, second back-blowing port 6116, third back-blowing port 6117, rotary cover 612, large end cover 6121, small end cover 6122, communication port 61221, first bag dust collector 62, second bag dust collector 63, third bag dust collector 64.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1 to 6, the embodiment of the invention provides a flue gas micro silicon powder recovery system of a non-stop submerged arc furnace, which comprises an incinerator 20, a waste heat boiler 10, a micro silicon powder separator 30, a negative pressure fan 50 and a synchronous back blowing dust removing device 60, wherein the incinerator 20 is provided with a closed hemispherical furnace body 21, the left end surface of the furnace body 21 is a circular plane, a plurality of flue gas diversion inlets 211 are uniformly distributed on the left end surface, each flue gas diversion inlet 211 is connected with a high-temperature flue gas discharge port of the submerged arc furnace 40, the right end surface opposite to the left end surface is a hemispherical surface, the center of the right end surface is provided with a flue gas collecting port 212, the flue gas collecting port 212 is connected with the upper end inlet of a flue gas channel of the waste heat boiler 10, the left end surface of the furnace body 21 is also provided with an air inlet 213, so that carbon monoxide in the high-temperature flue gas entering the furnace body 21 is combusted with oxygen in the air to generate carbon dioxide, the heat released by the carbon monoxide combustion is transmitted to the waste heat boiler 10, the waste heat boiler 10 comprises a boiler heating surface formed by a coil pipe group, a boiler flue gas channel forming a sealing 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, the steel ball collecting device 11 comprises a separating box 111, a valve body 112, a valve core 113, an inclined flow pipe 114, a flexible connection 115, a first connecting rod 116, a second connecting rod 117, a third connecting rod 118 and a balancing weight 119, the upper end and the lower end of the separating box 111 are opened, the upper end opening of the separating box 111 is connected with the lower end opening of the flue gas channel, so that steel ball and flue gas mixture in the flue gas channel enters the separating box 111, a plurality of rows of racks 1111 are arranged in the separating box 111 from top to bottom, the racks 1111 are horizontally arranged columns, the racks 1111 between two adjacent rows are arranged in a staggered manner, one side of the separating box 111 is provided with a flue gas outlet 1112, a screen is arranged on the smoke outlet 1112, the screen mesh is smaller than the diameter of steel balls, the upper end and the lower end of the valve body 112 are opened, the upper end opening of the valve body 112 is connected with the lower end opening of the separation box 111, one side of the valve body 112 is provided with a steel ball outlet 1121, the steel ball outlet 1121 is connected with the inlet of the diagonal flow pipe 114, the outlet of the diagonal flow pipe 114 is connected with the inlet of the flexible connection 115, the outer side wall of the valve core 113 is in sealed connection with the inner side wall of the valve body 112, the valve core 113 can move up and down along the side wall of the valve body 112, the top wall of the valve core 113 is obliquely designed, the top wall of the valve core 113 extends obliquely to one side of the steel ball outlet 1121, a first rotating shaft 1171 and a second rotating shaft 1181 are fixed on 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 rotationally 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 rotationally connected with the second rotating shaft 1181, the smoke outlet 1112 is connected with the inlet of the micro silicon powder separator 30, the outlet of the micro silicon powder separator 30 is connected with the inlet of the negative pressure fan 50, the synchronous back blowing dust removing device 60 comprises a disc switching valve 61, a cloth bag dust remover 62, a cloth bag dust remover 63 and a cloth bag dust remover 64, the disc switching valve 61 comprises a cylindrical valve body 611 and an 8-shaped rotating cover 612, the valve body 611 is hollow, the right circular end face of the valve body 611 is provided with a total air inlet 6111, the total air inlet 6111 is connected with the outlet of the negative pressure fan 50, the left circular end face of the valve body 611 is provided with a first air outlet 6112, a second air outlet 6113, a third air outlet 6114, a first air outlet 6112, a second air outlet 6113, the diameters of the third air outlet 6114 are the same, the first air outlet 6112, the second air outlet 6113 and the third air outlet 6114 are uniformly distributed at the center of the left end face, the first air outlet 6112, the second air outlet 6113 and the third air outlet 6114 are respectively connected with the smoke air inlets of the first cloth bag dust remover 62, the second cloth bag dust remover 63 and the third cloth bag dust remover 64 through pipelines, the left round end face of the valve body 611 is also provided with a first blowback port 6115, a second blowback port 6116 and a third blowback port 6117, the diameters of the first blowback port 6115, the second blowback port 6116 and the third blowback port 6117 are the same, the first blowback port 6115, the second blowback port 6116 and the third blowback port 6117 are uniformly distributed at the center of the left end face, the first blowback port 6115, the third blowback port 6116 and the third blowback port 6117 are respectively connected with the air inlets of the first cloth bag dust remover 62, the second cloth bag dust remover 63 and the third cloth bag dust remover 64 through pipelines, the center of the first air outlet 6112, the center of the first blowback port 6115 and the center of the left end face of the valve body 611 are collinear, the distance from the center of the first blowback port 6115 to the center of the left end face of the valve body 611 is smaller than the distance from the center of the first air outlet 6112 to the center of the left end face of the valve body 611, the 8-shaped rotary cover 612 is internally arranged in the valve body 611,8 and provided with a large end cover 6121 and a small end cover 6122, the large end cover 6121 and the small end cover 6122 are circular, the small end cover 6122 is provided with a communication port 61221, the large end cover 6121 and the left end face of the valve body 611 are coaxially arranged, the 8-shaped rotary cover 612 is driven by a stepping motor to rotate relative to the valve body 611, the center of the large end cover 6121, the center of the communication port 61221 and the center of the small end cover 6122 are collinear, the diameter of the large end cover 6121 is larger than the distance from the center of the first blowback port 6115 to the left end face of the valve body 611, the diameter of the large end cover 6121 is smaller than the distance from the center of the first air outlet 6112 to the center of the left end face of the valve body 611, the diameter of the small end cover 6122 is larger than the diameter of the first air outlet 6112, the distance from the center of the small end cover 6122 to the center of the left end face of the valve body 611 is equal to the distance from the center of the left end face of the valve body 611 of the first air outlet 6112, and the distance from the center of the communication port 61221 to the center of the left end face of the valve body 611 is equal to the distance from the center of the left end face of the valve body 611 of the first blowback port 6115.
In this embodiment, the steel balls enter the flue gas channel from the upper part 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. 5 and 6, the lower end of the flexible connection 115 naturally drops, the lower end of the flexible connection 115 directly extends into the bottom of the container, the third connecting rod 118 is rotated, the whole first connecting rod 116 is pulled downwards, the valve core 113 slides downwards along the inner wall of the valve body 112, the valve core 113 is below the steel ball outlet 1121, the steel balls enter the steel ball outlet 1121, then enter the flexible connection 115 through the inclined flow pipe 114, then enter the container containing the steel balls, and the steel balls can be conveniently prevented from jumping out of the container by adopting the flexible connection 115 to output the steel balls.
Referring to fig. 5 and 6, when the third link 118 is rotated without an external force, the second link 117 is rotated by the weight 119, the first link 116 is pushed upward as a whole, the valve core 113 slides upward along the inner wall of the valve body 112, and the valve core 113 blocks the ball outlet 1121.
The container containing the steel balls is lifted to the waste heat boiler 10 again, and the steel balls are poured into a flue gas channel of the waste heat boiler 10 to clean ash again.
The steel ball collecting device 11 is provided with the separating box 111, the plurality of rows of racks 1111 which are staggered up and down in the separating box 111 can lead the mixture of dust and steel balls to enter the separating box 111, the steel balls and dust to randomly enter gaps among the racks 1111, and the steel balls and dust can be fully separated from each other in the whole separating box 111 due to the random distribution of the steel balls and dust among the plurality of rows of racks 1111, so that the dust is favorably discharged from the dust outlet 1112 under the action of the negative pressure fan 50, the steel balls enter the valve body 112 due to the fact that the weight of the steel balls is quite large relative to the dust, and the dust and the steel balls can be fully separated.
In the invention, after the high-temperature flue gas generated by the submerged arc furnace 40 enters the incinerator 20, carbon monoxide in the high-temperature flue gas is combusted with oxygen in the air from the air inlet 213 to produce carbon dioxide, so that the emission of carbon monoxide gas is reduced, and the heat generated after the carbon monoxide gas is combusted is sent to the waste heat boiler 10, so that the chemical energy in the high-temperature flue gas is converted into heat energy, and the heat energy is fully utilized.
In the invention, the high-temperature flue gas pressure generated by different submerged arc furnaces 40 is different, when the high-temperature flue gas of different submerged arc furnaces 40 enters into the incinerator 20, the incinerator 20 plays a role of a buffer tank, so that the high-temperature flue gas pressure in the incinerator 20 is uniform, and after the pressure of the high-temperature flue gas in the incinerator 20 is stable, the high-temperature flue gas enters into the waste heat boiler 10, so that the heating surface of the waste heat boiler 10 is heated uniformly, and the working condition of the waste heat boiler 10 is stable.
In the invention, high-temperature flue gas enters the incinerator 20 from the flue gas diversion inlet 211 and flows out of the incinerator 20 from the flue gas collection port 212, and as the furnace chamber of the incinerator 20 is spherical, a roughly conical curved surface furnace chamber is formed from the flue gas diversion inlet to the flue gas collection port 212, and the furnace chamber is in smooth transition, so that the vortex and turbulence energy of the high-temperature flue gas of the incinerator 20 are reduced, the air extraction energy consumption is reduced, the air charging efficiency in the incinerator 20 is improved, and the carbon monoxide combustion efficiency is improved.
In the invention, the air inlet 213 of the incinerator 20 and the smoke diversion inlet 211 are arranged in the same flow direction, and the carbon monoxide and the air in the incinerator 20 flow in the same direction, so that the time for full contact is increased.
In this embodiment, the rotary cover 612 is driven to rotate by a stepper motor, for example, the stepper motor drives the rotary cover 612 to rotate 120 ° at a certain speed, then stops for a certain time, and then rotates 120 ° at a certain speed, so that the cycle is circulated, at first, the small end cover 6122 of the rotary cover 612 covers the first air outlet 6112, the second air outlet 6113 and the third air outlet 6114 are not covered by the large end cover 6121, the large end cover 6121 covers the second blowback opening 6116 and the third blowback opening 6117, and the communication hole is communicated with the first blowback opening 6115, in this case, the first bag-type dust remover 62 is in a blowback state, and the second bag-type dust remover 63 and the third bag-type dust remover 64 are in a dust removing state. With the rotation of the rotary cover 612, the first cloth bag dust remover 62, the second cloth bag dust remover 63 and the third cloth bag dust remover 64 are alternately in a dust removing and back blowing state, so that the back blowing of the cloth bag dust removers is realized without stopping. The embodiment particularly provides a technical concept for realizing the synchronous implementation of back blowing and dust removal of the bag-type dust remover.
The disc transfer valve 61 provided by the invention can ensure that one cloth bag dust collector 62, one cloth bag dust collector 63 and one cloth bag dust collector 64 are always in a back blowing state, and the other two cloth bag dust collectors are always in a dust removing state, so that the back blowing of the cloth bag dust collectors is realized without stopping, and the interruption of production caused by back blowing is avoided.
Referring to fig. 1, further, the silica fume separator 30 includes a separation cylinder 31 and an air outlet pipe 32, the inner cavity of the separation cylinder 31 is a closed space, the upper section of the separation cylinder 31 is a cylinder, the lower section of the separation cylinder 31 is a cone, a left air inlet 311 and a right air inlet 312 are arranged at the upper part of the separation cylinder 31, the left air inlet 311 and the right air inlet 312 have the same structure, the left air inlet 311 and the right air inlet 312 are uniformly distributed along the annular wall of the separation cylinder 31, the left air inlet 311 and the right air inlet 312 are vertically arranged, so that high-temperature fume enters the inner cavity of the upper section of the separation cylinder 31 in a reverse horizontal manner with the tangential line of the upper section of the separation cylinder 31, the air inlet directions of the left air inlet 311 and the right air inlet 312 are the same, the air outlet pipe 32 is arranged at the top of the separation cylinder 31, the upper end of the air outlet pipe 32 is exposed out of the separation cylinder 31, the lower end of the air outlet pipe 32 is arranged in the separation cylinder 31 and extends towards the lower section of the separation cylinder 31, the fume outlet 1112 is connected with the left air inlet 311 and the right air inlet 312, and the upper end port of the air outlet 32 is connected with the inlet of the negative pressure fan 50.
After entering the separating cylinder 31 from the tangential direction, the dust-containing flue gas spirally moves from top to bottom along the cylinder wall of the separating cylinder 31, the downward rotating airflow is an external vortex, the external vortex rotates upwards after reaching the cone bottom of the separating cylinder 31, and the upward rotating airflow upwards rotates along the axis of the separating cylinder 31 and is finally discharged through the air outlet pipe 32, and the upward rotating airflow is an internal vortex. In the rotating process of the air flow, large-particle dust and fire carbon particles are thrown to the wall of the separation cylinder 31 by the centrifugal force generated by the rotation of the air flow, and fall and separate under the action of the air flow pushing and gravity, however, because the air flow rotating upwards is eccentric due to single-side air inlet, part of the large-particle dust and the fire carbon particles can be brought into internal vortex, so that the quality of the micro silicon powder is reduced, and the subsequent cloth bag dust collector is scratched or burnt.
In this embodiment, the silica fume separator 30 is used to separate large-particle dust and fire carbon particles from the fume, so that the large-particle dust can be prevented from damaging the bag-type dust collector, and the fire carbon particles can be prevented from damaging the bag-type dust collector.
In this embodiment, the micro silicon powder separator 30 is used to effectively concentrate the micro silicon powder in the smoke dust, so as to separate other impurity particles mixed with the micro silicon powder, thereby improving the quality of the micro silicon powder.
In this embodiment, adopt left air intake 311, right air intake 312 synchronous air intake, left air intake 311, right air intake 312 are with separation barrel 31 cross-section circular central symmetry, have avoided the eccentric problem of air current of upwards rotating, have prevented that some large granule dust and take the charcoal grain can be brought into interior vortex, have improved little silica flour quality and have reduced, have still avoided the problem of the scratch or the burn of sack cleaner.
Referring to fig. 1, further, the ratio of the pipe diameter of the air outlet pipe 32 to the pipe diameter of the upper section of the separation cylinder 31 is 2, the ratio of the height value of the left air inlet 311 to the width value of the left air inlet 311 is 2, and the ratio of the height value of the separation cylinder 31 to the height value of the lower section of the separation cylinder 31 is 2.
The ratio of the pipe diameter of the air outlet pipe 32 to the pipe diameter of the upper section of the separation cylinder 31 in the embodiment reduces the mutual interference between the air inlet of the separation cylinder 31 and the internal vortex, reduces the rebound and back mixing phenomena of large particle dust and fire carbon particles, improves the quality of micro silicon powder, increases the external vortex area, and improves the separation effect as the centrifugal force field is larger.
The ratio of the height value of the left air inlet 311 to the width of the left air inlet 311 in this embodiment can reduce the pitch of the rotating air flow, the effective rotation in the separating cylinder 31 will be increased, the residence time will be increased, and the large particle dust and the charcoal with fire will be separated more easily.
In this embodiment, the ratio of the height value of the separation cylinder 31 to the height value of the lower section of the separation cylinder 31 increases, the average residence time of the centrifugal force field of the smoke dust entering the separation cylinder 31 increases, separation is easier, the height of the cone portion of the lower section of the separation cylinder 31 increases, so that the time required for secondary re-separation of the particles on the back-mixed lower section of the separation cylinder 31 increases, and the separation efficiency is improved.
Referring to fig. 1, further, the waste heat boiler 10 further comprises a furnace roof arranged at the top of the boiler flue gas channel, the furnace roof is provided with a steel ball sowing device 12, the steel ball sowing device 12 comprises a sowing collection bucket 121 and a steel ball sowing guide device 122, and the steel ball sowing guide device 122 is arranged below the sowing collection bucket 121 and is connected with an output port of the sowing collection bucket 121; the steel ball scattering guide 122 includes a cylindrical pipe 1221 and at least three dispersion pipes 1222; the upper end of the cylindrical pipe 1221 is communicated with the output port of the sowing and collecting hopper 121, the lower end of the cylindrical pipe 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 furnace roof and communicated with the boiler flue gas channel so as to uniformly sowing steel balls on the heating surface of the boiler.
Referring to fig. 1, further, the waste 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, double-row chains 133, steel ball conveying hoppers 134, a horizontal correcting rod 135, and a reversing wheel 136, the driving gear 131 and the three driven gears 132 are sequentially disposed at four corners of the supporting frame, the double-row chains 133 are sequentially wound around the driving gear 131 and the three driven gears 132 to form a closed rectangular chain ring, the steel ball conveying hoppers 134 are hung between the two chains of the double-row chains 133, the steel ball conveying hoppers 134 can rotate in a vertical plane around the rotation centers of the double-row chains 133, the steel ball conveying hoppers 134 are uniformly distributed along the rectangular chain ring, the gravity centers of the steel ball conveying hoppers 134 are biased to one side of the rotation centers of the steel ball conveying hoppers so that the steel ball conveying hoppers 134 recover the upward state of the opening ends of the steel ball conveying hoppers by means of dead weights, the horizontal correction rod 135 and the reversing wheel 136 are fixedly arranged on the supporting frame, the horizontal correction rod 135 is positioned above the lower horizontal section of the rectangular chain ring, the horizontal correction rod 135 is horizontally arranged along the length direction of the lower horizontal section of the rectangular chain ring, the two ends of the horizontal correction rod 135 are bent upwards, so that the end face of the opening end of the steel ball conveying hopper 134 on the lower horizontal section of the rectangular chain ring horizontally moves close to the lower side of the horizontal correction rod 135, a stirring piece 1341 is arranged on the steel ball conveying hopper 134, the steel ball conveying hopper 134 on the lower horizontal section of the rectangular chain ring moves rightwards, the stirring piece 1341 stirs the free end of the third connecting rod 118 to rotate around the second rotating shaft 1181, so that steel balls in the valve body 112 fall from the steel ball outlet 1121, enter the steel ball conveying hopper 134 sequentially through the inclined flow pipe 114 and the soft connection 115, the reversing wheel 136 is positioned below the upper horizontal section of the rectangular chain ring, the steel ball conveying hopper 134 on the upper horizontal section of the rectangular chain ring moves leftwards, the top of the reversing wheel 136 is higher than the bottom of the steel ball transporting bucket 134 to prevent the steel ball transporting bucket 134 from moving leftwards, so that the steel ball transporting bucket 134 rotates around the rotation center thereof relative to the double row chain 133 to enable the steel balls in the steel ball transporting bucket 134 to be poured into the scattering collecting bucket 121, and the bottom of the steel ball transporting bucket 134 in a 90-degree reversing state is higher than the top of the reversing wheel 136 to enable the steel ball transporting bucket 134 to move leftwards.
The modules or units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs.
The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a hot stove flue gas silica fume recovery system in ore deposit does not shut down which characterized in that: comprises an incinerator, a waste heat boiler, a silica fume separator, a negative pressure fan and a synchronous back-blowing dust removing device, wherein the incinerator is provided with a closed hemispherical furnace body, the left end face of the furnace body is a round plane, a plurality of fume diversion inlets are uniformly distributed on the left end face, each fume diversion inlet is connected with a high-temperature fume discharge port of the submerged arc furnace, the right end face opposite to the left end face is a hemispherical surface, the center of the right end face is provided with a fume collecting port, the fume collecting port is connected with the upper end inlet of a fume channel of the waste heat boiler, the left end face of the furnace body is also provided with an air inlet, so that carbon monoxide in high-temperature fume entering the furnace body is combusted with oxygen in the air to generate carbon dioxide, heat released by the combustion of the carbon monoxide is transmitted to the waste heat boiler, the waste heat boiler comprises a boiler heating surface formed by a snake-shaped pipe set, a boiler fume channel forming a sealing channel around the boiler heating surface, and a furnace bottom arranged at the bottom of the boiler fume channel, the bottom of the furnace is provided with a steel ball collecting device, the steel ball collecting device comprises a separating 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 separating box are opened, the upper end opening of the separating box is connected with the lower end opening of a flue gas channel so that steel ball smoke dust mixture in the flue gas channel enters the separating box, a plurality of rows of racks are arranged in the separating box from top to bottom, the racks are horizontally arranged columnar bodies, racks between two adjacent rows are arranged in a staggered manner, one side of the separating box is provided with a smoke dust outlet, a screen is arranged on the smoke dust outlet, the sieve holes of the screen are smaller than the diameters of steel balls, the upper end and the lower end of the valve body are opened, the upper end opening of the valve body is connected with the lower end opening of the separating box, one side of the valve body is provided with a steel ball outlet, the steel ball outlet is connected with the inlet of the inclined flow pipe, the outlet of the inclined flow pipe is connected with the soft connected inlet, the outer side wall of the valve core is in sealing connection 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 obliquely designed, the top wall of the valve core extends obliquely towards one side of the steel ball outlet, the first rotating shaft and the second rotating shaft are fixed on the furnace bottom, the upper end of the first connecting rod is hinged with the valve core, the left end of the second connecting rod is hinged with the middle end of the first connecting rod, the right end of the second connecting rod is provided with a balancing weight, the middle end of the second connecting rod is in rotating connection 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 in rotating connection with the second rotating shaft, the smoke dust outlet is connected with the inlet of the micro silicon powder separator, and the outlet of the micro silicon powder separator is connected with the inlet of the negative pressure fan, the synchronous back blowing dust collector comprises a disc conversion valve, a cloth bag dust collector, a second cloth bag dust collector and a third cloth bag dust collector, wherein the disc conversion valve comprises a cylindrical valve body and an 8-shaped rotary cover, the valve body is hollow, the left circular end face of the valve body is provided with a total air inlet, the total air inlet is connected with an outlet of a negative pressure fan, the right circular end face of the valve body is provided with a first air outlet, a second air outlet and a third air outlet, the diameters of the first air outlet, the second air outlet and the third air outlet are the same, the first air outlet, the second air outlet and the third air outlet are uniformly distributed at the center of the right end face, the first air outlet, the second air outlet and the third air outlet are respectively connected with a flue gas inlet of the first cloth bag dust collector, the second cloth bag dust collector and the third cloth bag dust collector through pipelines, and the right circular end face of the right side of the valve body is also provided with a back blowing port, the diameters of the second blowback mouth and the third blowback mouth are the same, the first blowback mouth, the second blowback mouth and the third blowback mouth are uniformly distributed at the center of the right end face, the first blowback mouth, the second blowback mouth and the third blowback mouth are respectively connected with the back blowing air inlet through pipelines, the air inlets of the first bag dust collector, the second bag dust collector and the third bag dust collector, the center of the first air outlet, the center of the first blowback mouth and the center of the right end face of the valve body are collinear, the distance from the center of the first blowback mouth to the center of the right end face of the valve body is smaller than the distance from the center of the first air outlet to the center of the right end face of the valve body, the 8-shaped rotary cover is arranged in the valve body, the 8-shaped rotary cover is provided with a large end cover and a small end cover, the large end cover and the small end cover are round, the small end cover is provided with a communication port, the large end cover and the right end face of the valve body are coaxially arranged, the 8-shaped rotary cover is driven by a stepping motor to rotate relative to the valve body, the center of the large end cover, the center of the communication port and the center of the small end cover are collinear, the communication port is positioned between the large end cover and the small end cover, the diameter of the large end cover is larger than the distance from the center of the first back blowing port to the center of the right end face of the valve body, the diameter of the large end cover is smaller than the distance from the center of the first air outlet to the center of the right end face of the valve body, the diameter of the small end cover is larger than the diameter of the first air outlet, the distance from the center of the small end cover to the center of the right end face of the valve body is equal to the distance from the center of the first back blowing port to the center of the right end face of the valve body.
2. A non-stop submerged arc furnace flue gas microsilica recovery system as recited in claim 1, wherein: the micro silicon powder separator comprises a separation cylinder body and an air outlet pipe, wherein the inner cavity of the separation cylinder body is a closed space, the upper section of the separation cylinder body is a cylinder body, the lower section of the separation cylinder body is a cone body, a left air inlet and a right air inlet are arranged on the upper portion of the separation cylinder body, the left air inlet and the right air inlet are identical in structure, the left air inlet and the right air inlet are uniformly distributed along the annular wall of the separation cylinder body, the left air inlet and the right air inlet are vertically arranged, so that high-temperature flue gas horizontally enters the inner cavity of the upper section of the separation cylinder body in the tangential direction of the upper section of the separation cylinder body, the air inlet direction of the left air inlet and the air inlet of the right air inlet are identical, the air outlet pipe is arranged at the top of the separation cylinder body, the upper end of the air outlet pipe is exposed out of the separation cylinder body, the lower end of the air outlet pipe extends towards the lower section of the separation cylinder body, the flue dust outlet is connected with the left air inlet and the right air inlet, and the upper end port of the air outlet pipe is connected with the inlet of a negative pressure fan.
3. A non-stop submerged arc furnace flue gas microsilica recovery system as recited in claim 2, wherein: the ratio of the pipe diameter of the air outlet pipe to the pipe diameter of the upper section of the separation barrel is 2, the ratio of the height value of the left air inlet to the width value of the left air inlet is 2, and the ratio of the height value of the separation barrel to the height value of the lower section of the separation barrel is 2.
4. A non-stop submerged arc furnace flue gas microsilica recovery system as recited in claim 1, wherein: the waste heat boiler further comprises a furnace top arranged at the top of the boiler flue gas channel, the furnace top is provided with a steel ball scattering device, the steel ball scattering device comprises a scattering collecting hopper and a steel ball scattering guiding device, and the steel ball scattering guiding device is arranged below the scattering collecting hopper and is connected with an output port of the scattering collecting hopper; the steel ball scattering guide device comprises a cylindrical pipeline and at least three dispersing pipes; the upper end of the cylindrical pipeline is communicated with the output port of the sowing collection hopper, the lower end of the cylindrical pipeline is communicated with one end of each dispersing pipe, and the other ends of the three dispersing pipes are connected with the furnace top and communicated with the boiler flue gas channel so as to uniformly sowing steel balls on the heating surface of the boiler.
5. A non-stop submerged arc furnace flue gas microsilica recovery system as recited in claim 4, wherein: the waste heat boiler also 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 reversing wheel, wherein 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 the two chains of the double rows of chains, the steel ball conveying hopper can rotate in a vertical plane around the rotation center of the steel ball conveying hopper relative to the double rows of chains, the steel ball conveying hoppers are uniformly distributed along the rectangular chain ring, the gravity centers of the steel ball conveying hoppers are biased to one side of the rotation center of the steel ball conveying hopper, so that the steel ball conveying hopper can recover the upward state of the opening end of the steel ball conveying hopper by means of dead weight, the horizontal correcting rod and the reversing wheel are fixedly arranged on the supporting frame, the horizontal correction rod is positioned above the lower horizontal section of the rectangular chain ring, the horizontal correction rod is horizontally arranged along the length direction of the lower horizontal section of the rectangular chain ring, the two ends of the horizontal correction rod are bent upwards to enable the end face of the opening end of the steel ball conveying hopper on the lower horizontal section of the rectangular chain ring to be horizontally moved close to the lower side of the horizontal correction rod, a stirring piece is arranged on the steel ball conveying hopper, the steel ball conveying hopper on the lower horizontal section of the rectangular chain ring moves rightwards, the stirring piece stirs the free end of the third connecting rod to rotate around the second rotating shaft so as to enable steel balls in the valve body to fall from the steel ball outlet and sequentially pass through the inclined flow pipe and the flexible connection to enter the steel ball conveying hopper, the reversing wheel is positioned below the upper horizontal section of the rectangular chain ring, the steel ball conveying hopper on the upper horizontal section of the rectangular chain ring moves leftwards, the top of the reversing wheel is higher than the bottom of the steel ball conveying hopper so as to stop the steel ball conveying hopper from moving leftwards, so that the steel ball conveying bucket rotates around the rotation center of the steel ball conveying bucket relative to the double-row chain, steel balls in the steel ball conveying bucket are poured into the sowing collecting bucket, and the bottom of the steel ball conveying bucket in a 90-degree reversing state is higher than the top of the reversing wheel, so that the steel ball conveying bucket moves leftwards.
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