CN104142068B - Residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device - Google Patents
Residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device Download PDFInfo
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- CN104142068B CN104142068B CN201410308467.2A CN201410308467A CN104142068B CN 104142068 B CN104142068 B CN 104142068B CN 201410308467 A CN201410308467 A CN 201410308467A CN 104142068 B CN104142068 B CN 104142068B
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
A kind of residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device, residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device is arranged on below the steel ball separated and collected device of residual heat boiler of steel ball dedusting type ore heat furnace, with when detecting that the steel ball totebox of circulating steel ball mechanical transport device is positioned at below it, steel ball in steel ball separated and collected device is flowed to steel ball totebox, and this residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device comprises hopper shell, tapered cap, rocking arm, balancing weight.
Description
Technical field
The present invention relates to waste heat boiler technical field, particularly a kind of residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device.
Background technology
Mineral hot furnace generally divides 3 kinds of type of furnaces, and the first is Totally-enclosed-type, and the second is that low hood is type semienclosed, and the third is high petticoat pipe open type.The fuel gas that semi-hermetic stove contains due to it is very little, temperatures as high more than 400 DEG C, and the air be mixed into from fire door is more, and exhaust gas volumn is larger.Be applicable to adopting residual heat boiler for exchanging heat generating, the thermal efficiency can reach about 26% ~ 28%, but difficult point is that the diameter of most of dust in flue gas is 0.1 ~ 0.5um, and is made up of the pelletizing of spherical particle and these particulates, containing SiO in dust
2, MgO, Fe
2o
3, Al
2o
3, P
2o
3, Na
2the nano_scale particles such as O, C, these particulates present different caking property under different humidity provinces and humidity, are very easy to stick to chimney, flue, metal tube surface, cause the heat exchange efficiency of heat-transfer surface sharply to reduce.
At present, the existing deashing scheme solved the problems of the technologies described above in prior art, " residual heat boiler of steel ball dedusting type ore heat furnace " publication number that such as China national Department of Intellectual Property announces is CN101701775A.This invention adopts furnace roof portion to be equipped with a steel ball sowing apparatus, steel ball separated and collected device is set below furnace bottom ash bucket, the steel ball collected is transported in steel ball totebox by steel ball separated and collected device, then the steel ball totebox of steel ball is housed above steel ball sowing apparatus by circulating steel ball mechanical transport device transport, steel ball totebox is made to pour steel ball into steel ball sowing apparatus by mechanical discharging gear wheel, steel ball sowing apparatus is by steel ball sowing in mineral hot furnace waste heat boiler, and the steel ball so by having kinetic energy beats heating surface and realizes deashing.But this invention has the following disadvantages: steel ball lock wind feeding device adopts chain connection mode to realize steel ball to flow to steel ball totebox, and this kind of mode effect is poor.
Summary of the invention
In view of this, be necessary to provide a kind of residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device.
A kind of residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device, residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device is arranged on below the steel ball separated and collected device of residual heat boiler of steel ball dedusting type ore heat furnace, with when detecting that the steel ball totebox of circulating steel ball mechanical transport device is positioned at below it, steel ball in steel ball separated and collected device is flowed to steel ball totebox, this residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device comprises hopper shell, tapered cap, rocking arm, balancing weight, hopper shell is arranged on the lower horizontal carrier of support frame, and hopper shell be positioned at steel ball separated and collected device discharging opening below to receive the steel ball that steel ball separated and collected device is separated, the size of tapered cap matches with the discharging opening of steel ball separated and collected device, tapered cap is connected with one end of rocking arm and tapered cap is arranged in the discharging opening of steel ball separated and collected device, the other end of rocking arm is connected with balancing weight, rocking arm bearing pin to be fixed on hopper shell and can to rotate around bearing pin, the discharging opening of steel ball separated and collected device is arranged in keep closed condition under the flue gas suction function of tapered cap in balancing weight and boiler flue, rocking arm is also arranged steel ball and discharge trigger member, trigger board on the double strand chain of circulating steel ball mechanical transport device and the steel ball of rocking arm discharge trigger member contact and relative motion time, rocking arm and rolling bearing relatively rotate to open tapered cap, after making steel ball fall into hopper shell, corresponding steel ball totebox is flowed to again by hopper shell, wherein rocking arm comprises transverse bar, trigger member discharged by steel ball, rolling bearing and tapered cap connecting rod, trigger member discharged by steel ball is shaft-like, one end that trigger member discharged by steel ball is fixedly connected with transverse bar, the other end that trigger member discharged by steel ball is provided with moving runner, one end of transverse bar is connected with balancing weight, the other end of transverse bar is fixedly connected with one end of tapered cap connecting rod, steel ball discharge trigger member and tapered cap connecting rod vertical with transverse bar, it is parallel with tapered cap connecting rod that trigger member discharged by steel ball, the other end of tapered cap connecting rod is fixedly connected with tapered cap, rolling bearing is installed on the transverse bar, and the axis of rolling bearing is vertical with transverse bar, rolling bearing is discharged between trigger member and tapered cap connecting rod at steel ball, bearing pin penetrates the inner ring of rolling bearing and relative with the inner ring of rolling bearing fixing, so that transverse bar and conical hopper are fixed, trigger board on double strand chain contacts also relative motion during with moving runner, trigger member promotion transverse bar discharged by steel ball and bearing pin relatively rotates, transverse bar drives tapered cap to do the motion of the discharging opening away from steel ball separated and collected device by tapered cap connecting rod, conical hopper is fallen into make steel ball.
The present invention compared with prior art tool has the following advantages: the rocking arm in residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device comprises transverse bar, trigger member discharged by steel ball, rolling bearing and tapered cap connecting rod, trigger member discharged by steel ball is shaft-like, one end that trigger member discharged by steel ball is fixedly connected with transverse bar, the other end that trigger member discharged by steel ball is provided with moving runner, one end of transverse bar is connected with balancing weight, the other end of transverse bar is fixedly connected with one end of tapered cap connecting rod, steel ball discharge trigger member and tapered cap connecting rod vertical with transverse bar, it is parallel with tapered cap connecting rod that trigger member discharged by steel ball, the other end of tapered cap connecting rod is fixedly connected with tapered cap, rolling bearing is installed on the transverse bar, and the axis of rolling bearing is vertical with transverse bar, rolling bearing is discharged between trigger member and tapered cap connecting rod at steel ball, bearing pin penetrates the inner ring of rolling bearing and relative with the inner ring of rolling bearing fixing, so that transverse bar and conical hopper are fixed, trigger board on double strand chain contacts also relative motion during with moving runner, trigger member promotion transverse bar discharged by steel ball and bearing pin relatively rotates, transverse bar drives tapered cap to do the motion of the discharging opening away from steel ball separated and collected device by tapered cap connecting rod, conical hopper is fallen into make steel ball.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the residual heat boiler of steel ball dedusting type ore heat furnace of a better embodiment.
Accompanying drawing 2 is structural representations of steel ball lock wind feeding device in Fig. 1.
Accompanying drawing 3 is structural representations of steel ball separated and collected device in Fig. 1.
In figure: residual heat boiler of steel ball dedusting type ore heat furnace 10, boiler heating surface 20, boiler smoke passage 30, circulating steel column mechanical ash removing device 40, support frame 41, left vertical supporting frame 410, right vertical supporting frame 411, upper lateral bearing frame 412, lower horizontal carrier 413, steel ball sowing apparatus 42, sow collection bucket 420, steel ball sowing guiding device 421, tube bundle 4210, dispersion pipe 4211, steel ball separated and collected device 43, cone-shaped collection bucket 430, ash pearl segregation section 431, damper 432, circulating steel ball mechanical transport device 44, driving wheel 440, driven pulley 441, double strand chain 442, rolling bearing 4420, trigger board 4421, fine tuning correcting plate 443, thick bar adjustable stem 444, steel ball totebox 445, rotating shaft 4450, balance guided plate 4451, mechanical discharging gear wheel 446, steel ball lock wind feeding device 45, hopper shell 450, conical hopper 4501, guiding channel 4502, anti-airborne dust flexible boot 4503, tapered cap 451, Rocker arm 4 52, transverse bar 4520, trigger member 4521 discharged by steel ball, rolling bearing 4522, tapered cap connecting rod 4523, moving runner 4524, balancing weight 453, steel ball accumulator tank 46.
Detailed description of the invention
Referring to Fig. 1, residual heat boiler of steel ball dedusting type ore heat furnace 10 comprises boiler smoke passage 30, the circulating steel column mechanical ash removing device 40 of the boiler heating surface 20 be made up of coiled pipe group, the seal channel formed in boiler heating surface 20 surrounding, the top of boiler smoke passage 30 arranges furnace roof, and the bottom of boiler smoke passage 30 arranges furnace bottom ash bucket.
Circulating steel column mechanical ash removing device 40 comprises support frame 41, steel ball sowing apparatus 42, steel ball separated and collected device 43, circulating steel ball mechanical transport device 44 and steel ball lock wind feeding device 45.
Support frame 41 is erected at around boiler smoke passage 30, support frame 41 comprises left vertical supporting frame 410, right vertical supporting frame 411, upper lateral bearing frame 412, lower horizontal carrier 413, the arranged on left and right sides being positioned at boiler smoke passage 30 of left vertical supporting frame 410, right vertical supporting frame 411 correspondence, upper lateral bearing frame 412, the top being positioned at boiler smoke passage 30 of lower horizontal carrier 413 correspondence, bottom.
Steel ball sowing apparatus 42 is arranged on the furnace roof of boiler smoke passage 30, and steel ball sowing apparatus 42 is positioned at the below of lateral bearing frame 412, below the furnace bottom ash bucket of boiler smoke passage 30, arrange steel ball separated and collected device 43, circulating steel ball mechanical transport device 44 is arranged on carriage, on 41.Wherein, steel ball sowing apparatus 42 comprises sows collection bucket 420, steel ball sowing guiding device 421, and steel ball sowing guiding device 421 is arranged on to be sowed below collection bucket 420, and is connected with the delivery outlet sowing collection bucket 420; Steel ball sowing guiding device 421 comprises tube bundle 4210 and at least three dispersion pipes 4211; The upper end of tube bundle 4210 is communicated with the delivery outlet sowing collection bucket 420, the lower end of tube bundle 4210 is communicated with one end of each dispersion pipe 4211, the other end of three dispersion pipes 4211 is connected with the furnace roof of boiler smoke passage 30, and be communicated with boiler smoke passage 30, so that steel ball is sowed uniformly on boiler heating surface 20.
Circulating steel ball mechanical transport device 44 comprises driving wheel 440, driven pulley 441, double strand chain 442, fine tuning correcting plate 443, thick bar adjustable stem 444, steel ball totebox 445, mechanical discharging gear wheel 446, driving wheel 440 is at least one, driven pulley 441 is at least three, driving wheel 440, driven pulley 441 is all fixed on support frame 41, double strand chain 442 around be arranged on above-mentioned driving wheel 440, on driven pulley 441, steel ball totebox 445 has been hung between two chains of double strand chain 442, the face that two chains of double strand chain 442 are relative is fixedly installed two rolling bearings faced 4420 and trigger board 4421, trigger board 4421 is positioned at the top of rolling bearing 4420, the opposing biside plate of steel ball totebox 445 arranges rotating shaft 4450, in the rolling bearing 4420 of insertion two chains of each rotating shaft 4450 correspondence of steel ball totebox 445, to make steel ball totebox 445 when running into obstacle and double strand chain 442 relatively rotates, and trigger board 4421 is higher than the opening of steel ball totebox 445.Fine tuning correcting plate 443, thick bar adjustable stem 444, mechanical discharging gear wheel 446 is fixed on lateral bearing frame 412, and mechanical discharging gear wheel 446 is near steel ball sowing apparatus 42, fine tuning correcting plate 443, thick bar adjustable stem 444 be arranged in parallel, fine tuning correcting plate 443 is positioned at the below of thick bar adjustable stem 444, fine tuning correcting plate 443 is corresponding with the whole height of the distance slightly between bar adjustable stem 444 and steel ball totebox 445, and the steel ball totebox 445 that steel ball is housed is first and fine tuning correcting plate 443, thick bar adjustable stem 444 first contacts to carry out level correction, contact to provide overturning driving force by mechanical discharging gear wheel 446 with mechanical discharging gear wheel 446 afterwards.
Steel ball separated and collected device 43 be arranged on boiler smoke passage 30 bottom and below the furnace bottom ash bucket being positioned at boiler smoke passage 30, the charging aperture of steel ball separated and collected device 43 is communicated with the furnace bottom ash bucket of boiler smoke passage 30, the discharging opening of steel ball separated and collected device 43 is connected with described steel ball lock wind feeding device 45, after being separated with ashes by steel ball, steel ball is flowed to described steel ball lock wind feeding device 45.Wherein, steel ball separated and collected device 43 comprises cone-shaped collection bucket 430, grey pearl segregation section 431 and damper 432, ash pearl segregation section 431 to be positioned at below cone-shaped collection bucket 430 and to be connected with cone-shaped collection bucket 430, the bottom surrounding of ash pearl segregation section 431 arranges damper 432, and the steel ball outlet of grey pearl segregation section 431 is connected with steel ball lock wind feeding device 45.
Steel ball lock wind feeding device 45 comprises hopper shell 450, tapered cap 451, Rocker arm 4 52, balancing weight 453, hopper shell 450 is arranged on the lower horizontal carrier 413 of support frame 41, and hopper shell 450 be positioned at steel ball separated and collected device 43 discharging opening below to receive the steel ball that steel ball separated and collected device 43 is separated, the size of tapered cap 451 matches with the discharging opening of steel ball separated and collected device 43, tapered cap 451 is connected with one end of Rocker arm 4 52 and tapered cap 451 is arranged in the discharging opening of steel ball separated and collected device 43, the other end of Rocker arm 4 52 is connected with balancing weight 453, Rocker arm 4 52 bearing pin to be fixed on hopper shell 450 and can to rotate around bearing pin, the discharging opening of steel ball separated and collected device 43 is arranged in keep closed condition under the flue gas suction function of tapered cap 451 in balancing weight 453 and boiler flue 30, Rocker arm 4 52 is also arranged steel ball and discharge trigger member, trigger board 4421 on double strand chain 442 and the steel ball of Rocker arm 4 52 discharge trigger member contact and relative motion time, Rocker arm 4 52 and rolling bearing 50 relatively rotate to open tapered cap 451, after making steel ball fall into hopper shell 450, corresponding steel ball totebox 445 is flowed to again by hopper shell 450.
Wherein, hopper shell 450 comprises conical hopper 4501, guiding channel 4502, the discharge gate of conical hopper 4501 is connected with guiding channel 4502, and conical hopper 4501 to the scope of the angle A of guiding channel 461 is: 90 ° of <A<120 °; Rocker arm 4 52 is relative with conical hopper 4501 fixing by bearing pin, steel ball discharges one end being provided with moving runner 4540 of trigger member 4521 near guiding channel 461; Further, hopper shell 450 also comprises anti-airborne dust flexible boot 4503, one end of anti-airborne dust flexible boot 4503 is socketed in the free end of guiding channel 4502, the other end opening of anti-airborne dust flexible boot 4503, so that steel ball is transported to steel ball totebox 445, so can prevent steel ball from ejecting from steel ball totebox 445.
Wherein, Rocker arm 4 52 comprises transverse bar 4520, trigger member 4521 discharged by steel ball, rolling bearing 4522 and tapered cap connecting rod 4523, trigger member 4521 discharged by steel ball is shaft-like, one end that trigger member 4521 discharged by steel ball is fixedly connected with transverse bar 4520, the other end that trigger member 4521 discharged by steel ball is provided with moving runner 4524, one end of transverse bar 4520 is connected with balancing weight 453, the other end of transverse bar 4520 is fixedly connected with one end of tapered cap connecting rod 4523, steel ball discharge trigger member 4521 and tapered cap connecting rod 4523 vertical with transverse bar 4520, it is parallel with tapered cap connecting rod 4523 that trigger member 4521 discharged by steel ball, the other end of tapered cap connecting rod 4523 is fixedly connected with tapered cap 451, rolling bearing 4522 is arranged on transverse bar 4520, and the axis of rolling bearing 4522 is vertical with transverse bar 4520, rolling bearing 4522 is discharged between trigger member 4521 and tapered cap connecting rod 4523 at steel ball, bearing pin penetrates the inner ring of rolling bearing 4522 and relative with the inner ring of rolling bearing 4522 fixing, so that transverse bar 4520 and conical hopper 4501 are fixed, trigger board 4421 on double strand chain 442 contacts also relative motion during with moving runner 4524, steel ball discharge trigger member 4521 promotes transverse bar 4520 and relatively rotates with bearing pin, transverse bar 4520 drives tapered cap 451 to do the motion of the discharging opening away from steel ball separated and collected device 43 by tapered cap connecting rod 4523, conical hopper 4501 is fallen into make steel ball.
In the present embodiment, steel ball totebox 445 is V-arrangement, the bottom lower surface of steel ball totebox 445 is provided with balance guided plate 4451, balance guided plate 4451 is vertical with rotating shaft 4450, balance guided plate 4451 is parallel with the chain of double strand chain 442, under the drive of double strand chain 442, the opening surface that the steel ball totebox 445 of steel ball is housed first contacts to carry out the level coarse adjustment of steel ball totebox 445 with thick bar adjustable stem 444, after the opening surface that the steel ball totebox 445 of steel ball is housed first contacts with thick bar adjustable stem 444, the level that balance guided plate 4451 and the fine tuning correcting plate 443 of steel ball totebox 445 contact to carry out steel ball totebox 445 is finely tuned.
Further, circulating steel column mechanical ash removing device 40 also comprises steel ball accumulator tank 46, steel ball accumulator tank 46 is fixed on the lower horizontal carrier 413 of support frame 41, and steel ball accumulator tank 46 is positioned at below the steel ball totebox 445 of the below of guiding channel 4502 and the steel ball of reception guiding channel 4502 eliminating.In the present embodiment, the bottom of steel ball accumulator tank 46 is inclined-plane, so can ensure that the steel ball collected pools together.
Claims (3)
1. a residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device, residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device is arranged on below the steel ball separated and collected device of residual heat boiler of steel ball dedusting type ore heat furnace, with when detecting that the steel ball totebox of circulating steel ball mechanical transport device is positioned at below it, steel ball in steel ball separated and collected device is flowed to steel ball totebox, this residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device comprises hopper shell, tapered cap, rocking arm, balancing weight, hopper shell is arranged on the lower horizontal carrier of support frame, and hopper shell be positioned at steel ball separated and collected device discharging opening below to receive the steel ball that steel ball separated and collected device is separated, the size of tapered cap matches with the discharging opening of steel ball separated and collected device, tapered cap is connected with one end of rocking arm and tapered cap is arranged in the discharging opening of steel ball separated and collected device, the other end of rocking arm is connected with balancing weight, rocking arm bearing pin to be fixed on hopper shell and can to rotate around bearing pin, the discharging opening being arranged in steel ball separated and collected device under the flue gas suction function of tapered cap in balancing weight and boiler flue keeps closed condition to make discharging opening, rocking arm is also arranged steel ball and discharge trigger member, trigger board on the double strand chain of circulating steel ball mechanical transport device and the steel ball of rocking arm discharge trigger member contact and relative motion time, rocking arm and rolling bearing relatively rotate to open tapered cap, after making steel ball fall into hopper shell, corresponding steel ball totebox is flowed to again by hopper shell, wherein rocking arm comprises transverse bar, trigger member discharged by steel ball, rolling bearing and tapered cap connecting rod, trigger member discharged by steel ball is shaft-like, one end that trigger member discharged by steel ball is fixedly connected with transverse bar, the other end that trigger member discharged by steel ball is provided with moving runner, one end of transverse bar is connected with balancing weight, the other end of transverse bar is fixedly connected with one end of tapered cap connecting rod, steel ball discharge trigger member and tapered cap connecting rod vertical with transverse bar, it is parallel with tapered cap connecting rod that trigger member discharged by steel ball, the other end of tapered cap connecting rod is fixedly connected with tapered cap, rolling bearing is installed on the transverse bar, and the axis of rolling bearing is vertical with transverse bar, rolling bearing is discharged between trigger member and tapered cap connecting rod at steel ball, bearing pin penetrates the inner ring of rolling bearing and relative with the inner ring of rolling bearing fixing, so that transverse bar and conical hopper are fixed, trigger board on double strand chain contacts also relative motion during with moving runner, trigger member promotion transverse bar discharged by steel ball and bearing pin relatively rotates, transverse bar drives tapered cap to do the motion of the discharging opening away from steel ball separated and collected device by tapered cap connecting rod, conical hopper is fallen into make steel ball.
2. residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device according to claim 1, it is characterized in that: hopper shell comprises conical hopper, guiding channel, the discharge gate of conical hopper is connected with guiding channel, and conical hopper to the scope of the angle A of guiding channel is: 90 ° of <A<120 °; rocking arm is relative with conical hopper fixing by bearing pin, steel ball discharges one end being provided with moving runner of trigger member near guiding channel.
3. residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device according to claim 2, it is characterized in that: hopper shell also comprises anti-airborne dust flexible boot, one end of anti-airborne dust flexible boot is socketed in the free end of guiding channel, the other end opening of anti-airborne dust flexible boot, so that steel ball is transported to steel ball totebox, so can prevent steel ball from ejecting from steel ball totebox.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410308467.2A CN104142068B (en) | 2014-07-01 | 2014-07-01 | Residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410308467.2A CN104142068B (en) | 2014-07-01 | 2014-07-01 | Residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device |
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| CN104142068A CN104142068A (en) | 2014-11-12 |
| CN104142068B true CN104142068B (en) | 2016-01-20 |
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| CN201410308467.2A Active CN104142068B (en) | 2014-07-01 | 2014-07-01 | Residual heat boiler of steel ball dedusting type ore heat furnace steel ball lock wind feeding device |
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| CN108688997B (en) * | 2018-07-26 | 2020-05-05 | 中信全养(山东)健康产业有限公司 | High-efficient seal pot is used to glossy ganoderma spore powder |
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| CN103466306A (en) * | 2013-08-30 | 2013-12-25 | 江苏太湖锅炉股份有限公司 | Self-unloading-type blanking device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US2665118A (en) * | 1949-01-19 | 1954-01-05 | Ekstroems Maskinaffaer Ab | Apparatus for cleaning gas swept heating surfaces |
| CN1213758A (en) * | 1998-10-06 | 1999-04-14 | 曹新华 | Boiler steel balls ash blowing device |
| CN201462865U (en) * | 2009-04-10 | 2010-05-12 | 钱尧翎 | Steel ball conveyor for removing soot from boiler |
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