CN103727795B - The direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces - Google Patents
The direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces Download PDFInfo
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- CN103727795B CN103727795B CN201310678438.0A CN201310678438A CN103727795B CN 103727795 B CN103727795 B CN 103727795B CN 201310678438 A CN201310678438 A CN 201310678438A CN 103727795 B CN103727795 B CN 103727795B
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Abstract
The direct power transmission furnace drying method of a kind of large-sized DC electric arc furnaces, the new furnace bottom laying depth built be 50-100mm conduction refractory, lay conduction charcoal block at hearth center, conduction charcoal tile height is greater than 1 meter, places the iron block of 50-100t, be paved with whole furnace bottom around charcoal block; Temperature thermocouple is laid, to measure oven drying temperature at stove internal cavity, floss hole, furnace bottom; Electrifying electrodes scratch start, electric arc conducts electricity between charcoal block at furnace roof electrode and furnace bottom; Power transmission power, arc position and arc length is regulated according to programming rate in stove.Programming rate is made to meet the requirement of refractory brick baker.When arc position is lower than 0.7 meter, in stove, add iron block, form molten bath after iron block is melted, control the programming rate of furnace bottom.After baker terminates, can continue to drop into material and start smelting process.This method has saved fuel and combustion gas expense, reduces baker cost.
Description
Technical field
The present invention relates to a kind of method of large-sized DC electric arc furnaces baker, particularly relate to electric arc furnaces direct power transmission furnace technology field.
Background technology
Large-sized DC electric arc furnaces adopts melting continuously technology, can run at stable temperature, extends electric arc furnaces service life.But Recent Development for Large Scale Electric Arc blow-on process more complicated, after electric furnace internal refractories lays, for ensureing refractory brick performance, progressively need heat up according to temperature curve, i.e. baker process, could start to smelt after baker terminates.General furnace drying method is from furnace roof install combustion device, utilizes the burning of combustion gas or fuel oil to improve in-furnace temperature, after in-furnace temperature reaches 1200 DEG C, to the arcing of electrode power transmission, utilizes the heat of electric arc to continue to heat up, removes the burner of furnace roof simultaneously.And in stove, adding iron block until iron block fusing forms molten bath, in-furnace temperature reaches smelting temperature, and baker could terminate.
This furnace drying method has following shortcoming: 1. adopt two kinds of baker modes, complicated operation, furnace roof need arrange multiple burner, to obtain uniform heating effect.And after combustion gas or fuel baker stage terminate, needing the burner removing furnace roof in high temperature environments, security risk is high, complicated operation.2. the water of burning baker stage generation 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, costly.
Summary of the invention
The object of the invention is to provide a kind of method to the direct power transmission baker of electric arc furnaces for deficiency of the prior art, to simplify furnace operation, reduce the risk of baker failure, reduce energy resource consumption.
For achieving the above object, present invention employs following technical scheme:
A kind of electric arc furnaces power transmission furnace drying method, comprises the steps:
(1) the new furnace bottom laying depth built be 50-100mm conduction refractory, lay conduction charcoal block at hearth center, conduction charcoal tile height is greater than 1 meter, adopts iron block to be paved with whole furnace bottom around charcoal block;
(2) temperature thermocouple is laid at stove internal cavity, floss hole, furnace bottom, to measure oven drying temperature;
(3) electrifying electrodes scratch start, electric arc conducts electricity between charcoal block at furnace roof electrode and furnace bottom; Initial power 0.5-1 MW, regulates power transmission power according to programming rate in stove.Programming rate is made to meet the requirement of refractory brick baker;
(4) monitor arc position, when arc position is lower than 0.7 meter, in stove, add iron block, form molten bath after iron block is melted, 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 heating of the shorter electric arc of arc length to bottom in stove and molten bath is stronger;
(6), after baker terminates, can continue to drop into material and start smelting process.
The conduction refractory that furnace bottom of the present invention overlays and charcoal block, when the starting the arc, are communicated with graphite electrode and Furnace Bottom Anode, are convenient to the arcing that is energized; Conduction refractory is in order to prevent molten iron to the erosion of furnace bottom refractory brick.
After the iron block fusing of the present invention around charcoal block forms molten bath, bath temperature and pool depth are measured, when pool depth is greater than 1 meter, adds iron block to molten bath and reduce bath temperature and the degree of depth; Prevent 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 block are when the starting the arc, and UNICOM's graphite electrode and Furnace Bottom Anode, be convenient to the arcing that is energized; Conduction refractory can also prevent molten iron to the erosion of 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, is controlled the intensification degree of depth of furnace wall and furnace roof by adjustment arc length, by the programming rate of adjustment Current Control furnace bottom; After baker middle and later periods furnace bottom forms metal bath, furnace bottom is heated up and is controlled by bath temperature, and key is to prevent furnace bottom from heating up in too fast and molten iron infiltration furnace bottom refractory brick.
beneficial effect of the present invention
Eliminate the fuel baker stage, saved the baking equipment of fuel oil or combustion gas, the investment of exhaust emissions facility, installation and removal work, simplify furnace operation.There is no combustion process, do not generate water, avoid the risk of magnesia refractories aquation.Save fuel and combustion gas expense, reduce baker cost.
Detailed description of the invention
Embodiment
The present embodiment relates to and carries out furnace operation to the large-sized DC electric arc furnaces of heat size 30MW, and concrete steps are:
(1) the new furnace bottom laying depth built be 50-100mm conduction refractory, lay conduction charcoal block at hearth center, conduction charcoal tile height 1 meter or 1.5 meters, places the iron block of about 100t, is paved with whole furnace bottom around charcoal block;
(2) temperature thermocouple is laid at stove internal cavity, floss hole, furnace bottom, 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) regularly carry out working of a furnace inspection between drying-out period, after the iron block fusing of surrounding them forms molten bath, bath temperature and pool depth are measured, when pool depth is greater than 1 meter, adds iron block to molten bath and reduce bath temperature and the degree of depth.
(5) during this period, continue the ramp case according to thermocouple in stove, power and arc length are adjusted.
(6) after in-furnace temperature arrives 1200 DEG C, form a less iron bath in stove, now entered and make the molten bath stage, continue to add iron block in stove, keep the stable of power, until molten bath is set up 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 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:
The new furnace bottom laying depth built be 50-100mm conduction refractory, lay conduction charcoal block at hearth center, conduction charcoal tile height is greater than 1 meter, adopts iron block to be paved with whole furnace bottom around charcoal block;
Temperature thermocouple is laid, in order to measure oven drying temperature at stove internal cavity, floss hole, furnace bottom;
Electrifying electrodes scratch start, electric arc conducts electricity between charcoal block at furnace roof electrode and furnace bottom; Initial power 0.5-1 MW, regulates power transmission power according to programming rate in stove; Programming rate is made to meet the requirement of refractory brick baker;
Monitoring arc position, when arc position is lower than 0.7 meter, adds iron block in stove, and form molten bath after iron block is melted, electric arc is between weld pool surface and graphite electrode bottom;
Furnace wall and furnace bottom programming rate are controlled by arc position and arc length;
After baker terminates, 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 block, when the starting the arc, are communicated with graphite electrode and Furnace Bottom Anode, are convenient to the arcing that is energized; Conduction refractory is in order to prevent molten iron to the erosion of 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, after the iron block fusing of surrounding them forms molten bath, bath temperature and pool depth are measured, when pool depth is greater than 1 meter, adds iron block to molten bath and reduce bath temperature; Prevent 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 |
|---|---|---|---|
| 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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| 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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| Publication Number | Publication Date |
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| CN103727795A CN103727795A (en) | 2014-04-16 |
| CN103727795B true CN103727795B (en) | 2015-10-14 |
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| CN201310678438.0A Expired - Fee Related 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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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
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 |
-
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 |
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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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