A Method for Eliminating Corrosion Defects of Bell Furnace
A bell-type furnace and defect technology, which is applied in the field of eliminating corrosion defects of bell-type furnaces, can solve the problems of quality cost impact, large total investment, inconvenient maintenance, etc., and achieve the effects of improving surface quality, reducing production costs and avoiding rust.
Active Publication Date: 2017-07-21
ANGANG STEEL CO LTD
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Problems solved by technology
Because the split cooling system has the disadvantages of complex equipment, inconvenient maintenance, basement, and large total investment, the cold rolling mill transformed the split cooling furnace into a spray cooling furnace
However, there is a serious shortcoming in spray cooling. On the one hand, the spray water splashes to the bottom of the cooling fan shell of the cooling cover to form water storage. When the cooling cover and the inner cover are removed from the furnace, the water remaining in the bottom of the cooling fan casing and the water box of the inner cover will flow out and drip onto the end surface of the steel coil, causing corrosion defects
485 tons of rusted waste products are produced every year, which has a serious impact on quality costs
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[0020] After the heating is finished, put on the cooling cover 4 and be cooled by the cooling fan 1 at first. When the furnace gas temperature drops to 260° C., the plug of the cooling fan 1 is manually removed to end the air cooling, and the spray water pipe is connected to start spray cooling. When the temperature of the steel coil 5 is close to the furnace temperature, manually remove the spray water pipe, stop the spray cooling, and connect the plug of the cooling fan 1 to start air cooling, and use the fan to dry the residue left on the bottom of the casing of the cooling fan 1 and the water box of the inner cover 3 Generally, the best fan blowing time to dry the stored water is 29-32 minutes. When the steel coil 5 temperature is reduced to the furnace temperature (generally 80 ℃), the cooling fan plug is manually unloaded, and the cooling cover 4 and the inner cover 3 are hung away.
[0021] According to the average cooling rate (8°C / h) of the steel coil 5 before the fur...
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The invention relates to a method for overcoming rusting defect of a bell-type furnace. The method comprises steps of (1) heating up the bell-type furnace, then covering a cooing hood, firstly cooling by a cooling fan, unplugging the cooling fan when the temperature of the air of the furnace is reduced to below 255-260 DEG C so as to finish air cooling, simultaneously connecting a spray header to begin to cool through spraying; (2) disassembling the spray header when the temperature of a steel coil is 3-5 DEG C higher than tapping temperature so as to stop spray cooling, simultaneously plugging the cooling fan to begin to air-cool, drying residual water at the bottom of the shell of the cooling fan and in the water box of an inner hood by the fan; and (3) unplugging the cooling fan when the temperature of the steel coil is reduced to the tapping temperature, lifting away the cooling hood and the inner hood. The method has the advantages that after spraying is added, the cooling fan starts to cool so as to remove the residual water at the bottom of the shell of the cooling fan and in the water box of the inner hood, so that the steel coil is prevented from being rusted, the surface quality of the steel plate is improved, and the production cost is lowered.
Description
technical field [0001] The invention relates to a method for eliminating corrosion defects of a bell-type furnace. Background technique [0002] At present, the rapid cooling process of the full-hydrogen bell furnace in the cold rolling plant below 400°C adopts two methods of split cooling and spray cooling. The split cooling is to extract the gas in the furnace and cool it through the gas / water heat exchanger before returning to the furnace. Inner way, spray cooling is the way in which the cooling cover sprays water directly to the top of the inner cover. Because the split cooling system has the disadvantages of complex equipment, inconvenient maintenance, need for a basement, and large total investment, the cold rolling mill transformed the split cooling furnace into a spray cooling furnace. However, there is a serious shortcoming in spray cooling. On the one hand, the spray water splashes to the bottom of the cooling fan shell of the cooling cover to form water storage. ...
Claims
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IPC IPC(8): C21D9/663
CPCY02P10/20
Inventor 王晓宇李运佳
Owner ANGANG STEEL CO LTD