CN103727795A - Method for directly transmitting power to bake large-scale direct current electric arc furnace - Google Patents
Method for directly transmitting power to bake large-scale direct current electric arc furnace Download PDFInfo
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- CN103727795A CN103727795A CN201310678438.0A CN201310678438A CN103727795A CN 103727795 A CN103727795 A CN 103727795A CN 201310678438 A CN201310678438 A CN 201310678438A CN 103727795 A CN103727795 A CN 103727795A
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Abstract
The invention discloses a method for directly transmitting power to bake a large-scale direct current electric arc furnace. Conductive refractory materials with the thickness of 50-100mm are laid on a newly-built furnace bottom, a conductive carbon block is laid in the center of the furnace bottom, and is higher than 1m, iron blocks of 50-100t are placed around the carbon block and are fully laid on the whole furnace bottom, temperature thermocouples are placed in a cavity in the furnace, a discharge outlet and the furnace bottom so as to measure furnace baking temperature, an electrode is powered to conduct arc ignition, an electric arc is arranged between a furnace top electrode and the conductive carbon block at the furnace bottom, according to the temperature rising speed inside the furnace, the transmission power, the position of the electric arc and the length of the electric arc are adjusted, and the temperature rising speed conforms to the requirement of the fireproof brick baked furnace. When the electric arc is lower than 0.7m, the iron blocks are added in the furnace to melt the iron blocks so as to form a molten pool, and the temperature rising speed of the furnace bottom is controlled. After furnace baking is finished, materials can be continuously put into the furnace to begin smelting, and according to the method, fuel and fuel gas cost is saved, and the cost for furnace baking is reduced.
Description
Technical field
The present invention relates to a kind of method of large-sized DC electric arc furnaces baker, relate in particular to the direct power transmission furnace technology of electric arc furnaces field.
Background technology
Large-sized DC electric arc furnaces adopts continuous smelting technique, can at stable temperature, move, and extends electric arc furnaces service life.But Recent Development for Large Scale Electric Arc blow-on process more complicated, after electric furnace been provided with internal refractories lays, for guaranteeing refractory brick performance, need progressively heat up according to temperature curve, i.e. baker process could start after baker finishes to smelt.General furnace drying method is from furnace roof install combustion device, utilizes the burning of combustion gas or fuel oil to improve temperature in stove, when temperature in stove reaches after 1200 ℃, to the arcing of electrode power transmission, utilizes the heat of electric arc to continue to heat up, and removes the burner of furnace roof simultaneously.And add iron block until iron block fusing forms molten bath in stove, and in stove, temperature reaches smelting temperature, and baker could finish.
This furnace drying method has following shortcoming: 1. adopt two kinds of baker modes, and complicated operation, furnace roof need arrange multiple burners, to obtain uniform heating effect.And after combustion gas or fuel baker stage finish, need under hot environment, remove the burner of furnace roof, security risk is high, complicated operation.2. the water that the baker stage generates that burns likely causes damage to the magnesia brick in stove, causes baker failure.3. fuel cost is high, and compared with electric arc heated, fuel economy is low, and energy utilization rate is low, and expense is high.
Summary of the invention
The object of the invention is to provides a kind of method to the direct power transmission baker of electric arc furnaces for deficiency of the prior art, to simplify baker operation, reduces the risk of baker failure, reduces energy resource consumption.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of electric arc furnaces power transmission furnace drying method, comprises the steps:
(1) conduction refractory that is 50-100mm at the new furnace bottom laying depth of building, at furnace bottom center, lay conduction charcoal piece, conduction charcoal tile height is greater than 1 meter, and charcoal piece adopts iron block to be paved with whole furnace bottom around;
(2) at stove internal cavity, floss hole, furnace bottom, lay temperature thermocouple, to measure oven drying temperature;
(3) electrifying electrodes scratch start, electric arc is between furnace roof electrode and furnace bottom conduction charcoal piece; Initial power 0.5-1 MW, regulates power transmission power according to programming rate in stove.Make programming rate meet the requirement of refractory brick baker;
(4) monitoring arc position when arc position is during lower than 0.7 meter, adds iron block in stove, makes to form molten bath after iron block fusing, and electric arc is between weld pool surface and graphite electrode bottom;
(5) furnace wall and furnace bottom programming rate are controlled by arc position and arc length, and arc position is higher, arc length is longer, and electric arc is stronger to the heating of stove internal upper part; Arc position is lower, the shorter electric arc of arc length is stronger to the heating in bottom in stove and molten bath;
(6), after baker finishes, can continue to drop into material and start smelting process.
The conduction refractory that furnace bottom of the present invention overlays and charcoal piece, when the starting the arc, are communicated with graphite electrode and Furnace Bottom Anode, are convenient to the arcing of switching on; Conduction refractory is in order to prevent the erosion of molten iron to furnace bottom refractory brick.
The present invention, when the iron block fusing around of charcoal piece forms behind molten bath, measures bath temperature and pool depth, when pool depth is greater than 1 meter, adds iron block reduce bath temperature and the degree of depth to molten bath; Prevent that furnace bottom from heating up in too fast and molten iron infiltration furnace bottom refractory brick.
Principle of the present invention is as follows: the conduction refractory that furnace bottom overlays and charcoal piece are when the starting the arc, and UNICOM's graphite electrode and Furnace Bottom Anode, be convenient to the arcing of switching on; Conduction refractory can also prevent the erosion of molten iron to refractory brick in stove; At the arcing initial stage, the heat radiation of electric arc heats up to furnace wall and furnace roof, and the resistance heat that conducting hearth produces heats up to bottom refractory, by adjusting the intensification degree of depth of arc length control furnace wall and furnace roof, by adjusting the programming rate of Current Control furnace bottom; Baker middle and later periods furnace bottom forms after metal bath, and furnace bottom heats up and controls by bath temperature, and key is to prevent that furnace bottom from heating up in too fast and molten iron infiltration furnace bottom refractory brick.
beneficial effect of the present invention
Cancel the fuel baker stage, saved baking equipment, the investment of exhaust emissions facility, the installation and removal work of fuel oil or combustion gas, simplified baker operation.There is no combustion process, do not generate water, avoided the risk of magnesia refractories aquation.Save fuel and combustion gas expense, reduced baker cost.
The specific embodiment
Embodiment
The present embodiment relates to the large-sized DC electric arc furnaces of heat size 30MW is carried out to baker operation, and concrete steps are:
(1) conduction refractory that is 50-100mm at the new furnace bottom laying depth of building, at furnace bottom center, lay conduction charcoal piece, 1 meter or 1.5 meters of conduction charcoal tile height, charcoal piece is placed the iron block of about 100t around, is paved with whole furnace bottom;
(2) at stove internal cavity, floss hole, furnace bottom, lay temperature thermocouple, to measure oven drying temperature;
(3) electrifying electrodes scratch start, initial power 0.5MW, adjusts according to the programming rate of thermocouple in stove, and each adjustment is not more than 0.2MW;
(4) between drying-out period, regularly carry out working of a furnace inspection, when electrode iron block fusing around forms behind molten bath, bath temperature and pool depth are measured, when pool depth is greater than 1 meter, to molten bath, adds iron block and reduce bath temperature and the degree of depth.
(5) during this period, continue according to the intensification situation of thermocouple in stove, power and arc length are adjusted.
(6) when temperature in stove arrives after 1200 ℃, in stove, formed a less iron bath, now entered and make the molten bath stage, continued to add iron block in stove, kept the stable of power, until that molten bath is set up is complete.
(7) add material, start to smelt.
The present embodiment only makes an explanation to the present invention as an illustration, and protection domain is the concrete scope of the each parameter in summary of the invention.
Claims (3)
1. the direct power transmission furnace drying method of large-sized DC electric arc furnaces, is characterized in that:
1) conduction refractory that is 50-100mm at the new furnace bottom laying depth of building, at furnace bottom center, lay conduction charcoal piece, conduction charcoal tile height is greater than 1 meter, and charcoal piece adopts iron block to be paved with whole furnace bottom around;
2) at stove internal cavity, floss hole, furnace bottom, lay temperature thermocouple, in order to measure oven drying temperature;
3) electrifying electrodes scratch start, electric arc is between furnace roof electrode and furnace bottom conduction charcoal piece; Initial power 0.5-1 MW, regulates power transmission power according to programming rate in stove; Make programming rate meet the requirement of refractory brick baker;
4) monitoring arc position when arc position is during lower than 0.7 meter, adds iron block in stove, makes to form molten bath after iron block fusing, and electric arc is between weld pool surface and graphite electrode bottom;
5) furnace wall and furnace bottom programming rate are controlled by arc position and arc length;
6), after baker finishes, drop into material and start smelting process.
2. the direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces according to claim 1, is characterized in that, the conduction refractory that furnace bottom overlays and charcoal piece, when the starting the arc, are communicated with graphite electrode and Furnace Bottom Anode, are convenient to the arcing of switching on; Conduction refractory is in order to prevent the erosion of molten iron to refractory brick in stove.
3. the direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces according to claim 1, it is characterized in that, when electrode iron block fusing around forms behind molten bath, bath temperature and pool depth are measured, when pool depth is greater than 1 meter, to molten bath, adds iron block and reduce bath temperature and the degree of depth; Prevent that furnace bottom from heating up in too fast and molten iron infiltration furnace bottom refractory brick.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310678438.0A CN103727795B (en) | 2013-12-14 | 2013-12-14 | The direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces |
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| CN201310678438.0A CN103727795B (en) | 2013-12-14 | 2013-12-14 | The direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces |
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| CN103727795A true CN103727795A (en) | 2014-04-16 |
| CN103727795B CN103727795B (en) | 2015-10-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782065A (en) * | 2016-08-25 | 2018-03-09 | 澄江县磷化工华业有限责任公司 | A kind of yellow phosphorus electric furnace electrode stove method for avoiding damaging furnace bottom |
| CN109813116A (en) * | 2019-01-21 | 2019-05-28 | 重庆大朗冶金新材料有限公司 | A kind of mineral hot furnace furnace drying method |
| 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 |
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| CN1068370A (en) * | 1991-07-09 | 1993-01-27 | 薛李 | The blow-in method of the hot stove in a kind of ore deposit |
| US6038246A (en) * | 1997-02-26 | 2000-03-14 | Nkk Steel Engineering, Inc. | Method and apparatus for operating a furnace |
| CN1766133A (en) * | 2005-11-15 | 2006-05-03 | 孙孟君 | One-step blow on method for smelting electric furnace |
| CN102502644A (en) * | 2011-09-26 | 2012-06-20 | 云南永昌硅业股份有限公司 | Silicon discharging method for initial blowing-in of metal silicon smelting |
| CN102559994A (en) * | 2012-03-20 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
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2013
- 2013-12-14 CN CN201310678438.0A patent/CN103727795B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068370A (en) * | 1991-07-09 | 1993-01-27 | 薛李 | The blow-in method of the hot stove in a kind of ore deposit |
| US6038246A (en) * | 1997-02-26 | 2000-03-14 | Nkk Steel Engineering, Inc. | Method and apparatus for operating a furnace |
| CN1766133A (en) * | 2005-11-15 | 2006-05-03 | 孙孟君 | One-step blow on method for smelting electric furnace |
| CN102502644A (en) * | 2011-09-26 | 2012-06-20 | 云南永昌硅业股份有限公司 | Silicon discharging method for initial blowing-in of metal silicon smelting |
| CN102559994A (en) * | 2012-03-20 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | Method for drying electric furnace by using molten iron |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782065A (en) * | 2016-08-25 | 2018-03-09 | 澄江县磷化工华业有限责任公司 | A kind of yellow phosphorus electric furnace electrode stove method for avoiding damaging furnace bottom |
| CN107782065B (en) * | 2016-08-25 | 2020-05-29 | 澄江县磷化工华业有限责任公司 | Yellow phosphorus electric furnace electrode baking method capable of avoiding damaging furnace bottom |
| CN109813116A (en) * | 2019-01-21 | 2019-05-28 | 重庆大朗冶金新材料有限公司 | A kind of mineral hot furnace furnace drying method |
| CN109813116B (en) * | 2019-01-21 | 2020-08-21 | 重庆大朗冶金新材料有限公司 | Method for baking submerged arc 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 |
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| CN103727795B (en) | 2015-10-14 |
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Address after: 650100 Kunming, Xishan District, Yunnan Spring Road, No. 913 Patentee after: Yunnan metallurgy Xin Litai industry company limited Address before: 650100 Kunming, Xishan District, Yunnan Spring Road, No. 913 Patentee before: Yunnan Xinli Nonferrous Metal Co., Ltd. |
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Effective date of registration: 20180427 Address after: 651600 Yunnan province Chuxiong Yi Autonomous Prefecture Wuding County Shing Shan Daping Zi Wu Ding Xin Li Titanium Industry Co., Ltd. Co-patentee after: Yunnan metallurgy Xin Litai industry company limited Patentee after: Wu Li Li Titanium Co., Ltd. Address before: No. 913, spring rain Road, Xishan District, Kunming, Yunnan Patentee before: Yunnan metallurgy Xin Litai industry company limited |
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