CN211920226U - Fresh alumina conveying system for electrolytic aluminum plant - Google Patents
Fresh alumina conveying system for electrolytic aluminum plant Download PDFInfo
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- CN211920226U CN211920226U CN202020248585.XU CN202020248585U CN211920226U CN 211920226 U CN211920226 U CN 211920226U CN 202020248585 U CN202020248585 U CN 202020248585U CN 211920226 U CN211920226 U CN 211920226U
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Abstract
A fresh alumina conveying system for an electrolytic aluminum plant comprises an alumina transport vehicle, a hydraulic plate-turning unloader, an alumina buffer hopper, a dust hood, a dust removing system, a manual gate valve, an electric gate valve, a first super-dense phase conveying chute, a second super-dense phase conveying chute, a first high-pressure centrifugal fan, a second high-pressure centrifugal fan, a first air supply pipeline, a third high-pressure centrifugal fan, a fourth high-pressure centrifugal fan, a second air supply pipeline, a third super-dense phase conveying chute, a fourth super-dense phase conveying chute, a first bucket type elevator, a second bucket type elevator, a bucket type elevator blanking pipeline, an alumina bin top material distribution system and a fresh alumina bin, the conveying system not only meets the alumina conveying requirements after the large-scale electrolytic bath and electrolytic subareas, but also improves the mechanical automation level of the system and the labor productivity, the capital investment and the operation cost of the system and the dust emission of the alumina storage and transportation system are reduced, and the working environment is improved.
Description
Technical Field
The utility model belongs to the technical field of material conveying of electrolytic aluminum plants, in particular to a fresh alumina conveying system for an electrolytic aluminum plant.
Background
At present, the NEUI600 kA-grade large-capacity aluminum electrolysis cell technology which is put into operation and popularized has obvious technical and economic advantages and becomes the first choice technology of a newly-built electrolytic aluminum series.
At the same time, to improve the overall economics of the electrolysis series, the capacity of individual electrolysis zones has increased from 7 to 10 ten thousand tons per year to 20 to 25 ten thousand tons per year. After the capacity of the electrolysis subarea is increased, the demand of fresh alumina serving as a raw material for producing the electrolytic aluminum is increased from 300-1060-1320-t/d. The fresh alumina conveying system mainly comprises a feeding system and a conveying system, and mainly comprises the following components:
1. fresh alumina feeding system
Currently, commercially available alumina is typically introduced into the plant in the form of bagged material and stored in alumina warehouses. Fresh alumina is mainly fed by adopting a bag charging mode, namely, a charging platform is arranged in an alumina warehouse, bagged alumina is transported to the charging platform through a crown block, and a hopper is added after bag opening. The main problems that exist are:
(1) the feeding capacity of a single set of system is low, and is usually 40-50 t/h;
(2) the mechanization and automation level is low, and the labor productivity is low;
(3) the packaging bag is difficult to recycle, which causes a great deal of economic loss;
(4) the operation environment where the bag-opening operator is located is dangerous and has high dust concentration.
2. Fresh alumina conveying system
At present, fresh alumina is conveyed mainly by dilute phase conveying, concentrated phase conveying, super concentrated phase conveying, belt conveying and the like, and has the following defects:
(1) the dilute phase conveying system has insufficient conveying capacity, high operation energy consumption and large abrasion to alumina;
(2) the conveying capacity of the concentrated phase conveying system is insufficient, and the operation energy consumption is high;
(3) the conveying capacity of the existing ultra-concentrated phase conveying system is insufficient;
(4) air cushion belt conveyor systems are costly.
In view of the major problems with the above systems, there is a need to develop a new fresh alumina delivery system for use in an electrolytic aluminum plant.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior system, the utility model provides a fresh alumina conveying system for an electrolytic aluminum plant, which comprises a plurality of hydraulic plate-turning unloader, a plurality of hydraulic plate-turning unloader is used for lifting the alumina transport vehicle stopped on the hydraulic plate-turning unloader and rotating a certain angle to unload the alumina in the carriage of the alumina transport vehicle into an alumina buffer hopper, the hydraulic plate-turning unloader is arranged at one side of the alumina buffer hopper, a dust-collecting cover is arranged above the alumina buffer hopper, the hydraulic plate-turning unloader is arranged corresponding to the opening end of the dust-collecting cover, the dust-containing flue gas generated in the unloading process is collected by the dust-collecting cover, the dust-containing flue gas is purified by a cloth bag dust remover arranged at the rear side of the dust-collecting cover and then is emptied, a plurality of discharge ports are arranged at the bottom of the alumina buffer hopper, and a manual gate valve and an electric gate valve are sequentially arranged at the discharge ports, the manual gate valve is used for controlling the conveying speed of the alumina, the electric gate valve is used for controlling the opening of an alumina conveying channel, the feed opening is connected with a plurality of super-concentrated phase conveying chute groups, each super-concentrated phase conveying chute group is simultaneously connected with a plurality of bucket elevators, the alumina conveyed by the bucket elevators is discharged into the alumina bin top distribution system through the bucket elevators, and the alumina is stored in the fresh alumina bin through the alumina bin top distribution system.
Super dense phase carries chute group includes two high-pressure centrifugal fan, two air feed pipelines and two super dense phase and carries the chute, and two super dense phase carry the chute to set up in carrying the vestibule, one of them super dense phase carries chute one end and is connected with the feed opening, and the other end passes through the adapter and is connected with another super dense phase and carries chute one end, and its other end is connected with bucket elevator, one of them high-pressure centrifugal fan carries the chute air feed, another for one of them super dense phase through one of them air feed pipeline high-pressure centrifugal fan carries the chute air feed for another super dense phase through another air feed pipeline.
The hydraulic plate turnover car unloader is mutually standby; a plurality of the super concentrated phase conveying chute groups are mutually standby; the bucket elevators are mutually standby.
The height of the super concentrated phase conveying chute group is 300-1000 mm, the width of the super concentrated phase conveying chute group is 300-1000 mm, the conveying gradient of the super concentrated phase conveying chute group is 0-10%, and the conveying capacity is 200-500 t/h; the length of the single-section chute is 2.5 m.
The air supply coefficient of the high-pressure centrifugal fan is 1.2-1.8 m3/(m2Min) and the air supply pressure is 4000-15000 Pa.
The diameter of air supply pipeline is 200 ~ 600mm, the pipe wall thickness is 2 ~ 5mm, and air supply pipeline adopts Q235B carbon steel to make.
The lifting weight of the hydraulic plate turnover unloader is 70-200 t; the tipping angle of the hydraulic tipping platform unloader is as follows: 0 degree to 50 degrees; the single lifting time of the hydraulic plate turnover unloader is 5-15 min; the discharging capacity is 50-300 t/h.
The lifting height of the bucket elevator is 5-60 m, and the lifting capacity is 30-500 t/h.
The collection efficiency of the dust collection cover is 92-98%, and the dust removal efficiency of the bag-type dust remover is 92-99%; the volume of the alumina buffer hopper is 1-20 m3(ii) a The length of the valves of the manual gate valve and the electric gate valve is 100-300 mm, and the diameter of the valves is 100-600 mm.
The clear height of the conveying corridor is more than 2.5m, and the width of the conveying corridor is more than 2 m.
A method of using a fresh alumina delivery system for an electrolytic aluminum plant comprising the steps of:
The utility model has the advantages that:
1. the utility model provides a fresh alumina conveying system for electrolytic aluminum factory, which can satisfy the material conveying demand after the enlargement of the electrolytic bath and the electrolytic subarea, and effectively improve the whole process technology level of the electrolytic aluminum.
2. A hydraulic plate turnover unloader is adopted as main equipment for alumina unloading, and the feeding capacity of the single-set system is improved from 40-50t/h to 100-150 t/h; the hydraulic plate turnover unloading machine is adopted as main equipment for alumina unloading, and the working time of the system is reduced from 24h to 16h by improving the mechanization and automation level of the system; the investment of main body unloading equipment and a bag-type dust collector is reduced, and the ton aluminum investment of an electrolytic aluminum plant can be reduced by 1%; the mechanization and automation level of the system is improved, the operation and maintenance personnel are reduced, the labor productivity of an electrolytic aluminum plant can be improved by 6 percent, and the production cost of electrolytic aluminum is reduced by 9.6 yuan/t-Al; the energy consumption of the system is reduced, and the ton aluminum energy consumption of the system is reduced by 0.48 kW.h/t-Al on a same scale; the bag breaking loss of the aluminum oxide packaging bag in the unloading process is avoided, and the production cost of electrolytic aluminum is reduced by 26.7 yuan/t-Al; the dust emission generated in the feeding process of the system is reduced by 73 percent; the work safety of operators is improved by reducing the overhead operation of the operators, the working environment of the operators is improved by reducing the bag dismantling operation of the operators, the green index of the system is improved, and the main technical and economic indexes of the fresh alumina storage and transportation system are improved.
3. The utility model discloses the lifting hook bridge crane among the current charging system has been cancelled to the system, adopts hydraulic pressure to turn over the board unloader as the main part equipment that aluminium oxide unloaded, has reduced the civil engineering investment of system, can reduce electrolytic aluminum factory ton aluminium investment 0.8%.
4. The utility model discloses the dust collecting cover who sets up collects the raise dust that the in-process produced of unloading, and dirty gaseous entrapment efficiency > 97%, improves 1-2% than original system efficiency.
5. The utility model discloses the operational capability of sack cleaner who sets up is 250003H, the concentration of dust in the treated flue gas is less than 5mg/Nm3。
6. The utility model discloses the system adopts super dense phase to carry the chute as the main part equipment that the system carried, promotes the conveying capacity of single set system from 40-50t/h to 200-plus 300 t/h.
Drawings
FIG. 1 is a first plan view of a fresh alumina delivery system for an aluminum electrolysis plant of the present invention;
FIG. 2 is an enlarged schematic view of the fresh alumina delivery system of the present invention at the first view point F;
FIG. 3 is a top view of a fresh alumina delivery system of the present invention for use in an electrolytic aluminum plant;
FIG. 4 is a first elevation view of a fresh alumina delivery system for use in an electrolytic aluminum plant of the present invention;
FIG. 5 is a second elevation view of a fresh alumina delivery system for use in an electrolytic aluminum plant of the present invention;
FIG. 6 is a third elevation view of a fresh alumina delivery system for use in an electrolytic aluminum plant of the present invention;
the method comprises the following steps of 1-an alumina transport vehicle, 2-a hydraulic plate turnover unloader, 3-an alumina buffer hopper, 4-a dust collection cover, 5-a bag-type dust remover, 6-a manual gate valve, 7-an electric gate valve, 8-a first super-dense phase conveying chute, 9-a second super-dense phase conveying chute, 10-a first high-pressure centrifugal fan, 11-a second high-pressure centrifugal fan, 12-a first air supply pipeline, 13-a third high-pressure centrifugal fan, 14-a fourth high-pressure centrifugal fan, 15-a second air supply pipeline, 16-a third super-dense phase conveying chute, 17-a fourth super-dense phase conveying chute, 18-a first bucket elevator, 19-a second bucket elevator, 20-a bucket elevator discharging pipeline, 21-an alumina bin top distributing system and 22-a fresh alumina bin.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 6, a fresh alumina conveying system for an electrolytic aluminum plant comprises two hydraulic flap unloader 2, two super dense phase conveying chute sets and two bucket elevators, wherein the two super dense phase conveying chute sets are respectively a first super dense phase conveying chute set and a second super dense phase conveying chute set, the two bucket elevators are respectively a first bucket elevator 18 and a second bucket elevator 19, the unloading system of the hydraulic flap unloader 2 eliminates a crown block, the capital investment and the operating cost of the system are reduced, the hydraulic flap unloader 2 is used for lifting and rotating the alumina carrier 1 stopped thereon by a certain angle to unload the alumina in the alumina carrier 1 into the alumina buffer hopper 3, the hydraulic flap unloader 2 is arranged at one side of the alumina buffer hopper 3, a dust collection cover 4 is arranged above the alumina buffer hopper 3, the hydraulic plate turnover unloader 2 is arranged at the opening end of a dust collection cover 4, dust-containing smoke generated in the unloading process is collected through the dust collection cover 4, the dust-containing smoke is purified and then exhausted through a bag-type dust collector 5 arranged at the rear side of the dust collection cover 4, two feed openings are arranged at the bottom of an alumina buffer hopper 3, a manual gate valve 6 and an electric gate valve 7 are sequentially arranged on each feed opening, the manual gate valve 6 is used for controlling the conveying speed of alumina, the electric gate valve 7 is used for controlling the opening of an alumina conveying channel, one feed opening is connected with a first super-concentrated phase conveying chute group, the other feed opening is connected with a second super-concentrated phase conveying chute group, the first super-concentrated phase conveying chute group and the second super-concentrated phase conveying chute group are simultaneously connected with a first bucket elevator 18 and a second bucket elevator 19, alumina conveyed by the first bucket elevator 18 or the second bucket elevator 19 is unloaded to the top of an alumina bin through a bucket elevator discharge pipeline 20 The material system stores alumina in a fresh alumina bin 22 through a material distribution system 21 at the top of the alumina bin.
The first super concentrated phase conveying chute group comprises a first high-pressure centrifugal fan 10, a third high-pressure centrifugal fan 13, a first super concentrated phase conveying chute 8 and a fourth super concentrated phase conveying chute 17; first super dense phase carries chute 8 one end to be connected with one of them feed opening, and first super dense phase carries the chute 8 other end to pass through adapter and the super dense phase of fourth and carries chute 17 one end to be connected, and the super dense phase of fourth carries chute 17 to be connected with first bucket elevator 18 and second bucket elevator 19 simultaneously, first high pressure centrifugal fan 10 carries chute 8 air feed for first super dense phase through first air feed pipeline 12, third high pressure centrifugal fan 13 carries chute 17 air feed for the super dense phase of fourth through second air feed pipeline 15.
The second super dense phase conveying chute group comprises a second high-pressure centrifugal fan 11, a fourth high-pressure centrifugal fan 14, a second super dense phase conveying chute 9 and a third super dense phase conveying chute 16, one end of the second super dense phase conveying chute 9 is connected with another feed opening, the other end of the second super dense phase conveying chute 9 is connected with one end of the third super dense phase conveying chute 16 through an adapter, the third super dense phase conveying chute 16 is simultaneously connected with a first bucket type lifting machine 18 and a second bucket type lifting machine 19, the second high-pressure centrifugal fan 11 supplies air for the second super dense phase conveying chute 9 through a first air supply pipeline 12, and the fourth high-pressure centrifugal fan 14 also supplies air for the third super dense phase conveying chute 16 through a second air supply pipeline 15.
During normal production, the first super concentrated phase conveying chute group or the second super concentrated phase conveying chute group does not work at the same time and are mutually standby; under special conditions, the first super-concentrated phase conveying chute group and the second super-concentrated phase conveying chute group work simultaneously; the first bucket elevator 18 and the second bucket elevator 19 do not work at the same time and are mutually standby; in special cases, the first bucket elevator 18 and the second bucket elevator 19 work simultaneously; during normal production, the first high-pressure centrifugal fan 10 and the second high-pressure centrifugal fan 11 do not work at the same time, and 2 are mutually standby; under special conditions, the first high-pressure centrifugal fan 10 and the second high-pressure centrifugal fan 11 work simultaneously; during normal production, the third high-pressure centrifugal fan 13 and the fourth high-pressure centrifugal fan 14 do not work at the same time, and 2 are mutually standby; in special cases, the third high-pressure centrifugal fan 13 and the fourth high-pressure centrifugal fan 14 may also be operated simultaneously.
The height of the first super-concentrated phase conveying chute 8, the second super-concentrated phase conveying chute 9, the third super-concentrated phase conveying chute 16 and the fourth super-concentrated phase conveying chute 17 is 586mm, the width of the first super-concentrated phase conveying chute is 500mm, the conveying gradient of the first super-concentrated phase conveying chute 8, the second super-concentrated phase conveying chute 9, the third super-concentrated phase conveying chute 16 and the fourth super-concentrated phase conveying chute 17 is 0.7%, and the conveying capacity is 250 t/h; the length of the single-section chute is 2.5 m.
The first high-pressure centrifugal fan 10, the second high-pressure centrifugal fan 11,The third high-pressure centrifugal fan 13 and the fourth high-pressure centrifugal fan 14 have an air supply coefficient of 1.5m3/(m2Min), the air supply pressure is 11596 Pa.
The diameter of the first air supply pipeline 12 and the diameter of the second air supply pipeline 15 are 400mm, the wall thickness of the first air supply pipeline 12 and the wall thickness of the second air supply pipeline 15 are 3mm, and the first air supply pipeline 12 and the second air supply pipeline 15 are both made of Q235B carbon steel.
The lifting weight of the hydraulic plate-turning unloader 2 is 100 t; the tipping angle of the hydraulic tipping platform unloader 2 is as follows: 0 degree to 50 degrees; the single lifting time of the hydraulic plate turnover unloader 2 is 8 min; the discharge capacity is 150 t/h.
The lifting height of the first bucket elevator 18 and the second bucket elevator 19 is 41.8m, and the lifting capacity is 300 t/h.
The collection efficiency of the dust collection cover 4 is 97%, and the dust removal efficiency of the bag-type dust remover 5 is 99%; the volume of the alumina buffer hopper 3 is 10m3(ii) a The length of the valves of the manual gate valve 6 and the electric gate valve 7 is 200mm, and the diameter of the valves is 300 mm.
A method of using a fresh alumina delivery system for an electrolytic aluminum plant comprising the steps of:
step 2, the alumina in the alumina buffer hopper 3 passes through the feed opening, the manual gate valve 6 and the electric gate valve 7 and then enters the first super-dense phase conveying chute 8 or the second super-dense phase conveying chute 9, and when the normal operation is carried out, when alumina enters the first hyperconcentration phase conveying chute 8, the second hyperconcentration phase conveying chute 9 does not work at the moment, the alumina passing through the first hyperconcentration phase conveying chute 8 enters the fourth hyperconcentration phase conveying chute 17, the alumina is simultaneously conveyed to the inlets of a first bucket elevator 18 and a second bucket elevator 19 through a fourth super dense phase conveying chute 17, the first bucket elevator 18 or the second bucket elevator 19 works to lift the alumina, and is conveyed into the alumina bin through a feeding pipe, at the moment, a first high-pressure centrifugal fan 10 supplies air to a first super-dense phase conveying chute 8 through a first air supply pipeline 12, and a third high-pressure centrifugal fan 13 supplies air to a fourth super-dense phase conveying chute 17 through a second air supply pipeline 15; when alumina enters the second hyper-dense phase conveying chute 9, the first hyper-dense phase conveying chute 8 does not work at this moment, the alumina passing through the second hyper-dense phase conveying chute 9 enters the third hyper-dense phase conveying chute 16, the alumina is simultaneously conveyed to the inlets of the first bucket elevator 18 and the second bucket elevator 19 through the third hyper-dense phase conveying chute 16, the first bucket elevator 18 or the second bucket elevator 19 works to lift the alumina and conveys the alumina into an alumina bin through a discharging pipe, at this moment, the second high-pressure centrifugal fan 11 supplies air to the second hyper-dense phase conveying chute 9 through the first air supply pipeline 12, and the fourth high-pressure centrifugal fan 14 also supplies air to the third hyper-dense phase conveying chute 16 through the second air supply pipeline 15; under special conditions, the first super-concentrated phase conveying chute 8 and the second super-concentrated phase conveying chute 9 work simultaneously to convey alumina, the alumina is conveyed into a fourth super-concentrated phase conveying chute 17 and a third super-concentrated phase conveying chute 16 through the first super-concentrated phase conveying chute 8 and the second super-concentrated phase conveying chute 9, the alumina is conveyed into inlets of a first bucket elevator 18 and a second bucket elevator 19 through the fourth super-concentrated phase conveying chute 17 and the third super-concentrated phase conveying chute 16 simultaneously, the first bucket elevator 18 and the second bucket elevator 19 work simultaneously to lift the alumina and convey the alumina into an alumina bin through a blanking pipe, at the moment, the first high-pressure centrifugal fan 10 and the second high-pressure centrifugal fan supply air to the first super-concentrated phase conveying chute 8 and the second super-concentrated phase conveying chute 9 through a first air supply pipeline 12 simultaneously, the third high-pressure centrifugal fan 13 and the fourth high-pressure centrifugal fan supply air to the fourth super-concentrated phase conveying chute 17 and the third super-concentrated phase conveying chute 9 through a second air supply pipeline 15 simultaneously The tank 16 is supplied with gas.
Claims (9)
1. A fresh alumina conveying system for an electrolytic aluminum plant is characterized by comprising a plurality of hydraulic plate-turning unloader machines, wherein the hydraulic plate-turning unloader machines are arranged on one side of an alumina buffer hopper, a dust collection cover is arranged above the alumina buffer hopper, the hydraulic plate-turning unloader machines are arranged corresponding to the opening end of the dust collection cover, dust-containing flue gas is purified and treated by a bag-type dust collector arranged on the rear side of the dust collection cover and then is emptied, a plurality of feed openings are arranged at the bottom of the alumina buffer hopper, manual gate valves and electric gate valves are sequentially arranged at the feed openings and are used for controlling the conveying speed of alumina, the electric gate valves are used for controlling the opening of an alumina conveying channel, the feed openings are connected with a plurality of super-concentrated phase conveying chute groups, each super-concentrated phase conveying chute group is simultaneously connected with a plurality of bucket elevators, and alumina conveyed by the bucket elevators is discharged into an alumina bin top cloth system through a feed pipeline of the bucket elevators, alumina is stored in a fresh alumina bin through an alumina bin top distribution system.
2. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 1, wherein: super dense phase carries chute group includes two high-pressure centrifugal fan, two air feed pipelines and two super dense phase and carries the chute, and two super dense phase carry the chute to set up in carrying the vestibule, carry the vestibule net height > 2.5m, and the width > 2m, one of them super dense phase and carry chute one end and be connected with the feed opening, and the other end passes through the adapter and is connected with another super dense phase and carry chute one end, and its other end is connected with bucket elevator, one of them high-pressure centrifugal fan carries the chute air feed for one of them super dense phase through one of them air feed pipeline, another high-pressure centrifugal fan carries the chute air feed for another super dense phase through another air feed pipeline.
3. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 2, wherein: the height of the super concentrated phase conveying chute group is 300-1000 mm, the width of the super concentrated phase conveying chute group is 300-1000 mm, the conveying gradient of the super concentrated phase conveying chute group is 0-10%, and the conveying capacity is 200-500 t/h; the length of the single-section ultra-concentrated phase conveying chute is 2.5 m.
4. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 2, wherein: the air supply coefficient of the high-pressure centrifugal fan is 1.2-1.8 m3/(m2Min) and the air supply pressure is 4000-15000 Pa.
5. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 2, wherein: the diameter of air supply pipeline is 200 ~ 600mm, the pipe wall thickness is 2 ~ 5mm, and air supply pipeline adopts Q235B carbon steel to make.
6. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 1, wherein: the hydraulic plate turnover car unloader is mutually standby; a plurality of the super concentrated phase conveying chute groups are mutually standby; the bucket elevators are mutually standby.
7. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 1, wherein: the lifting weight of the hydraulic plate turnover unloader is 70-200 t; the tipping angle of the hydraulic tipping platform unloader is as follows: 0 degree to 50 degrees; the single lifting time of the hydraulic plate turnover unloader is 5-15 min; the discharging capacity is 50-300 t/h.
8. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 1, wherein: the lifting height of the bucket elevator is 5-60 m, and the lifting capacity is 30-500 t/h.
9. A fresh alumina delivery system for an electrolytic aluminum plant according to claim 1, wherein: collection of the dust collection coverThe collection efficiency is 92-98%, and the dust removal efficiency of the bag-type dust remover is 92-99%; the volume of the alumina buffer hopper is 1-20 m3(ii) a The length of the valves of the manual gate valve and the electric gate valve is 100-300 mm, and the diameter of the valves is 100-600 mm.
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| CN111137702A (en) * | 2020-03-03 | 2020-05-12 | 东北大学设计研究院（有限公司） | Fresh alumina conveying system for electrolytic aluminum plant and using method |
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