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Electric furnace full scrap smelting process
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An all-scrap steel and process technology, applied in the direction of electric furnace, process efficiency improvement, furnace, etc., can solve problems such as difficult hot charging of molten iron, difficult hot charging of electric furnace hot metal, difficulty in utilizing short-process energy consumption and emissions of electric furnace, etc., to achieve compression loading The effect of shortening the material time, speeding up the melting speed and improving the utilization rate of electric energy
Active Publication Date: 2022-08-02
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +2
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Problems solved by technology
[0004] However, patents CN1598000A and CN103205529A pointed out that there are the following problems in the hot charging of a large amount of molten iron in electric furnaces: on the one hand, it is difficult to take advantage of the advantages of short process energy consumption and low emission of electric furnaces; Load molten iron
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Embodiment 1
[0019] An electric furnace full scrap steel smelting process adopts a 100t top-loading ultra-high-power electric arc furnace, comprising:
[0020] Step 1: Configure the material package, the first package of scrap steel is loaded with 70t, and 3t of crushed material, 0.5t of anthracite, 6t of briquette, 18.5t of crushed material, 6t of heavy waste, 6t of crushed material, and briquette are added to the material package from bottom to top. 5t, crushed material 25t; the total amount of scrap in the second package is 48t, the material package is added from bottom to top with heavy waste 30t, crushed material 18t;
[0021] Step 2: molten steel smelting, add the first bag of scrap into the furnace, lower the electrode to start energizing, use 9-speed voltage and 6-speed current for arc starting, change the furnace wall gun to preheating mode, the main oxygen flow is 250Nm3 / h, natural gas The flow rate is 250m3 / h, and the epoxy flow rate is 250m3 / h. When the power consumption is 50k...
Embodiment 2
[0027] An electric furnace full scrap steel smelting process adopts a 100t top-loading ultra-high-power electric arc furnace, comprising:
[0028] Step 1: Configure the material package, the first package of scrap steel is loaded with 66t, and 2t of crushed material, 0.7t of anthracite, 5t of briquette, 18.3t of crushed material, 5t of heavy waste, 5t of crushed material, and briquette are added to the material package from bottom to top. 4t, crushed material 26t; the total amount of scrap steel in the second package is 52t, the material package is loaded with heavy waste from bottom to top, 32t, crushed material 20t;
[0029] Step 2: Smelting molten steel, adding the first bag of scrap into the furnace, lowering the electrode and starting to energize, using 9-speed voltage and 6-speed current for arc starting, changing the furnace wall gun to preheating mode, the main oxygen flow is 225Nm3 / h, natural gas The flow rate is 200m3 / h, and the epoxy flow rate is 225m3 / h. When the p...
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Abstract
The present application discloses an electric furnace full scrap steel smelting process, including: step 1: configuring a first material bag and a second material bag; step 2: molten steel smelting, adding the first material bag into the electric arc furnace, lowering the electrode to start energizing, and simultaneously The furnace wall gun is changed from purging mode to preheating mode. When the power consumption reaches 50~60kWh / t, the furnace wall gun turns on the oxygen blowing mode; when the power consumption reaches 150~160kWh / t, the second material bag is added to the electric arc furnace Inside, smelting with electricity, and the furnace wall gun turns on the preheating mode; Step 3: When the power consumption reaches 250~280kWh / t, spray carbon powder to make foamed slag and perform the slag flow operation; Step 4: When the power consumption reaches 350~280kWh / t 360kWh / t, the molten steel temperature reaches 1590-1610℃, and the tapping operation is performed. The electric furnace all-scrap smelting process of the present application optimizes the scrap charging system, oxygen supply system and power supply system under the condition of top-charging and open-cover electric furnace all-scrap, so as to realize the high-efficiency and low-cost production of all-scrap in the electric furnace, and the power consumption of the electric furnace can be controlled within 350~360kWh / t, the smelting cycle can be controlled at 40~42min.
Description
technical field [0001] The present application relates to the technical field of steelmaking, in particular to an electric furnace full scrap steel smelting process. Background technique [0002] At present, the electric furnace short-flow smelting process uses scrap steel as the main raw material. Compared with the blast furnace-converter long-flow smelting process, the short-flow process reduces energy consumption by 50%. 2 75% reduction in emissions. With the continuous increase of scrap steel accumulation in China and the gradual emphasis on environmental issues, the electric furnace short-flow process has developed rapidly in China. However, compared with the converter smelting process, the domestic electric furnace all-scrap smelting process is less competitive in terms of production efficiency and cost. Therefore, the method of hot charging molten iron in electric furnace is generally used in China to improve the smelting efficiency of electric furnace and reduce po...
Claims
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Application Information
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