CN102826551A - Blow-in method for long-term shutdown maintenance of metallic silicon ore heating furnace - Google Patents
Blow-in method for long-term shutdown maintenance of metallic silicon ore heating furnace Download PDFInfo
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- CN102826551A CN102826551A CN2012103432262A CN201210343226A CN102826551A CN 102826551 A CN102826551 A CN 102826551A CN 2012103432262 A CN2012103432262 A CN 2012103432262A CN 201210343226 A CN201210343226 A CN 201210343226A CN 102826551 A CN102826551 A CN 102826551A
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Abstract
The invention relates to a blow-in method for long-term shutdown maintenance of a metallic silicon ore heating furnace. In a production process of metallic silicon, before an ore heating smelting electric furnace is maintained, the ore heating smelting electric furnace is required to be shut down firstly, and the ore heating smelting electric furnace is required to be blown in after being maintained. The operation method which can directly blow in without prepurging in each shutdown solves the problem that consumption of manpower, material and financial resource during prepurging and blow-in of every shutdown maintenance process is high; and furnace condition adjusting time is reduced, and fluctuation of product quality when blow-in is carried out again for production, thus the aims of low-cost blow-in, smooth transition and high and stable yield are realized.
Description
Technical field
Patent of the present invention relates to the blow-in method of a kind of Pure Silicon Metal ore deposit shutdown maintenance of hot furnace superintendent phase, belongs to metallic silicon smelting Technology field.
Background technology
Hot electric furnace shutdown maintenance in Pure Silicon Metal ore deposit and blow-on are the important process links that Pure Silicon Metal is produced.In the production process of Pure Silicon Metal, owing to rationing the power supply and reason such as production singularity, the hot stove in ore deposit all need carry out large-scale equipment rebuilding every year.Each overhaul and equipment replacement need be removed the whole furnace charges in the stove; And dead material part need carry out earlier could removing after the explosion in the stove; When explosion to stove in brick fuel and refractory brick have partly and damage, need carry out again brickwork behind the prepurging and handle, each blow-on will be passed through processes such as bavin baking, burnt baking, electricity baking.So the human and material resources and the financial resources of labor are all wanted in shutdown maintenance and blow-on, and after the blow-on adjustment time of the working of a furnace longer, production cost, production output, quality and each item technical indicator are all had a strong impact on.
The shutdown maintenance of known metallic silicon smelting process and blow-in method adopt the process of prepurging-brickwork-bavin baking-deashing-Jiao's baking-electricity baking more; Promptly adopt the old furnace charge in the stove mode of explosion thoroughly to remove earlier; Then furnace bottom and burner hearth carbon brick are built by laying bricks or stones again; The bavin baking, the deashing that earlier the carbon brick of newly building by laying bricks or stones were carried out 24 hours before the blow-on are handled, and then stone electricity baking (being 25mm nut coke and part wood charcoal powder at each shop, phase electrode bottom one bed thickness for the 300mm-600mm granularity promptly), and the electricity baking begins to feed intake after 41 hours according to circumstances; Slowly electric load is sent in adjustment, changes ordinary production over to after 58 hours.Each shutdown maintenance and the required expense of blow-on are more than 50 ten thousand yuan, and cost is higher.
Summary of the invention
The invention provides the method for hot stove shutdown maintenance in metallic silicon smelting ore deposit and blow-on.In the production process of Pure Silicon Metal, before the hot electric furnace maintenance in ore deposit, want earlier blowing out, need blow-on after having overhauled.The present invention is to provide the not working method of the just direct blow-on of prepurging of each blowing out; Each shutdown maintenance prepurging and blow-on human and material resources and the big problem of financial resources consumption have been solved; Reduced the working of a furnace adjustment time; Reduce the fluctuation of quality product when blow-on is produced again, thereby reached the purpose of low-cost blow-on and smooth transition stable high yield.
The present invention implements by following technical scheme
In the production process of Pure Silicon Metal, before the hot electric furnace maintenance in ore deposit, want earlier blowing out, need blow-on after having overhauled, technical scheme provided by the invention is the problem that will solve blowing out and overhaul the back blow-on, makes that having overhauled the back gets into ordinary production.
Blowing out
:Before the hot electric furnace maintenance in ore deposit, want earlier blowing out, after each blowing out, per 15 minutes movable one-time electrodes avoid electrode to be clung by furnace charge, after charge-temperature is reduced to 600 ℃, and the electrode of stopping action when counter electrode does not have adhesive power;
Blow-on: need blow-on after having overhauled, before the hot stove in ore deposit send electricity, earlier with R=50mm around the electrode; The furnace charge of h=2m is removed and is filled with the broken carbon pole of 3-50mm; Do shock test in voltage 35 gear conditions then, the height of control charge level is at ± 150mm, and electrode current reaches more than the 60KA; Beginning blanking operation gets into ordinary production.
Compare the advantage that has with known technology.
1, adopt the not technology of the direct blow-on of prepurging, the utilization ratio that electric energy is converted into heat energy is high, and the heat energy that produces between drying-out period directly acts on the intensification of electrode and the heating of furnace bottom and furnace wall, and furnace temperature promotes fast, helps enlarging the crucible zone.
2, owing to do not need salvage stores in the clearing furnace, the rear electrode that feeds intake is in the optimum position all the time, and furnace temperature raises rapidly, can promote the reduction of silica, and the constant product quality index does not have obvious influence.
3, furnace lining and electrode heat up more to become rationally, temperature is even, are difficult for generating electrodes accident and burn-back accident during the blow-on, have avoided again furnace lining by laying bricks or stones such as is built at work.
4, exempt heavy works such as adding firewood, deashing, alleviated working strength of workers.
5, adopt not that prepurging has shortened 10 days repair time with regard to the technology of blow-on, practiced thrift stove and blow-on material and the expense of repairing.
6, directly the blow-on technical matters have safely, save time, simply, economic advantage.
Embodiment
Embodiment:The present invention implements on the hot stove of the 25500KVA of company's independent research industrial silicium mine, and production and technical indication is smelted electric unit consumption 11680Kwh, carbon unit consumption 1.58t, silica unit consumption 2.60,46 tons of average daily productions.
First blowing out before the maintenance
,Adopted PLC hydrauliccontrol system activity one-time electrode in per 15 minutes after each blowing out, avoid electrode to be clung by furnace charge, after charge-temperature is reduced to 600 ℃, the electrode of stopping action when counter electrode does not have adhesive power;
Need blow-on after having overhauled, blow-on according to the following steps:
1), the hot stove of industrial silicium mine send the preparation work before the electricity, the dead material of (part) around the first clearing electrode, R=50mm around the electrode; Add 200kg around every phase electrode of h=2m, the broken electrode of 3-50mm, three-phase electrode connects with carbon-point respectively; Carbon-point covers with nut coke, makes electrode be prone to arcing, send electricity when the period two, primary current was lower than 60KA; Add broken electrode adjustment, guarantee three stove emmetropia uses;
2), begin to carry out trial line charging to three-phase electrode, at first carry out impact experiment at furnace transformer 35 gears, said 35 gears are meant that the secondary side voltage of furnace transformer is 134V, secondary side current is 46704A, the attack time is 10s, 20s, 30s,
3), impact to finish back inspection relevant device and whether have potential safety hazard, (1) hydraulicefficiency system is oil-proof, (2) water-cooling system is water-tight, (3) electrode non-cracking, (4) instrument voltage control is at 120-140V, current control is at 60-80KA;
4), furnace transformer transfers to 8,9 gears afterwards, the blow-on of supplying power, the secondary side voltage that said 8 gears are furnace transformer is 215V; Secondary side current is 39535A, and 9 gear secondary side voltages are 212V, and secondary side current is 40095A; Reach and can begin the blanking operation more than the 60KA when sending electricity to reach 12 hours rear electrode electric currents, charge level is controlled at fire door ± 150mm, waits to produce normal; Filler covers electrode fully; Have empty to burn phenomenon, recover charge level at fire door ± 50mm after getting into ordinary production, this moment the three-phase electrode difference between current apart from must not surpassing 5KA, do not allow to lift and the electrode that descends sending in electric 8 hours;
5), send electricity during electrode current be controlled at 60-80KA; When going out silicon, with arc burner the stove eye is burnt more than the diameter 80mm after determining silicon stove eye, when electric weight reaches 400,000 kwh, go out silicon for the first time; Current consumption goes out silicon for the second time when reducing to 100,000 KWh; Current consumption goes out silicon for the third time when reducing to 80,000 kwh, per tour afterwards normally goes out silicon, gets into ordinary production.
Claims (2)
1. the blow-in method of the shutdown maintenance of hot furnace superintendent phase of Pure Silicon Metal ore deposit is characterized in that: implement by following technical scheme: blowing out
:Before the hot stove shutdown maintenance in ore deposit, want earlier blowing out, after the blowing out, per 15 minutes movable one-time electrodes avoid electrode to be adhered to by furnace charge, after charge-temperature is reduced to 600 ℃, and the electrode of stopping action when counter electrode does not have adhesive power;
Blow-on: need blow-on after having overhauled; Before the hot stove in ore deposit sent electricity, with R=50mm around the electrode, the furnace charge of h=2m was removed and is filled with the broken carbon pole of 3-50mm earlier; Do shock test in voltage 35 gear conditions then; The height of control charge level is at ± 150mm, and electrode current reaches and can begin the blanking operation more than the 60KA, gets into ordinary production.
2. the blow-in method of shutdown maintenance of a kind of Pure Silicon Metal according to claim 1 hot furnace superintendent phase of ore deposit, it is characterized in that: the blow-in method of the shutdown maintenance on the hot stove of 25500KVA industrial silicium mine is accomplished according to the following steps:
First blowing out before the maintenance
,Adopted PLC hydrauliccontrol system activity one-time electrode in per 15 minutes after each blowing out, avoid electrode to be clung by furnace charge, after charge-temperature is reduced to 600 ℃, the electrode of stopping action when counter electrode does not have adhesive power;
It is following to have overhauled back blow-on step:
1), the hot stove in ore deposit send the preparation work before the electricity, adds 200kg around the dead material around the first clearing electrode, every phase electrode; The broken electrode of 3-50mm, three-phase electrode connect with carbon-point respectively, and carbon-point covers with nut coke; Make electrode be prone to arcing; Send electricity when the period two, primary current was lower than 60KA, add broken electrode adjustment, guarantees three stove emmetropia uses;
2), begin to carry out trial line charging to three-phase electrode, at first carry out impact experiment at furnace transformer 35 gears, said 35 gears are meant that the secondary side voltage of furnace transformer is 134V, secondary side current is 46704A, the attack time is 10s, 20s, 30s;
3), impact to finish back inspection relevant device and whether have potential safety hazard: (1) hydraulicefficiency system is oil-proof, and (2) water-cooling system is water-tight, (3) electrode non-cracking, (4) instrument voltage is built in 120-140V, current control is at 60-80KA;
4), ore heat furnace transformer transfers to 8,9 gears afterwards, the blow-on of supplying power, the secondary side voltage that said 8 gears are ore heat furnace transformer is 215V; Secondary side current is 39535A, and 9 gear secondary side voltages are 212V, and secondary side current is 40095A; Reach beginning blanking operation more than the 60KA when sending electricity to reach 12 hours rear electrode electric currents; Charge level is controlled at fire door ± 150mm, waits to produce normal filler and covers electrode fully, does not have empty the burning to recover the height of charge level at fire door ± 50mm after phenomenon gets into ordinary production; This moment, the three-phase electrode difference between current be apart from must not surpassing 5KA, do not allow to lift and the electrode that descends sending in electric 8 hours;
5), send electricity during electrode current be controlled at 60-80KA; When going out silicon; With arc burner the stove eye is burnt more than the diameter 80mm after determining silicon stove eye, when current consumption reaches 400,000 kwh, go out silicon for the first time, current consumption goes out silicon for the second time when reducing to 100,000 KWh; Current consumption goes out silicon for the third time when reducing to 80,000 kwh, per tour afterwards normally goes out silicon.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509485A (en) * | 2015-06-04 | 2016-04-20 | 新疆天业（集团）有限公司 | Blow-in method of calcium carbide furnace |
| CN108826975A (en) * | 2018-05-31 | 2018-11-16 | 山西太钢不锈钢股份有限公司 | The method for opening furnace success rate for improving mineral wool electric furnace |
| CN114659376A (en) * | 2022-04-11 | 2022-06-24 | 宁夏昌茂祥冶炼有限公司 | Method for baking submerged arc furnace with three-phase electrode and control device thereof |
| CN117142475A (en) * | 2023-10-27 | 2023-12-01 | 内蒙古润阳悦达新能源科技有限公司 | Cleaning control method for furnace bottom silicon in industrial silicon smelting process |
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| CN102241400A (en) * | 2011-05-17 | 2011-11-16 | 云南永昌硅业股份有限公司 | External refining method of industrial silicon |
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| CN102241400A (en) * | 2011-05-17 | 2011-11-16 | 云南永昌硅业股份有限公司 | External refining method of industrial silicon |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509485A (en) * | 2015-06-04 | 2016-04-20 | 新疆天业（集团）有限公司 | Blow-in method of calcium carbide furnace |
| CN108826975A (en) * | 2018-05-31 | 2018-11-16 | 山西太钢不锈钢股份有限公司 | The method for opening furnace success rate for improving mineral wool electric furnace |
| CN108826975B (en) * | 2018-05-31 | 2019-10-25 | 山西太钢不锈钢股份有限公司 | The method for opening furnace success rate for improving mineral wool electric furnace |
| CN114659376A (en) * | 2022-04-11 | 2022-06-24 | 宁夏昌茂祥冶炼有限公司 | Method for baking submerged arc furnace with three-phase electrode and control device thereof |
| CN114659376B (en) * | 2022-04-11 | 2023-07-28 | 宁夏昌茂祥冶炼有限公司 | Submerged arc furnace baking method with three-phase electrode and control device thereof |
| CN117142475A (en) * | 2023-10-27 | 2023-12-01 | 内蒙古润阳悦达新能源科技有限公司 | Cleaning control method for furnace bottom silicon in industrial silicon smelting process |
| CN117142475B (en) * | 2023-10-27 | 2024-02-13 | 内蒙古润阳悦达新能源科技有限公司 | Cleaning control method for furnace bottom silicon in industrial silicon smelting process |
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Application publication date: 20121219 |