A kind of large-scale direct-current electric arc furnace direct-feeding oven method
A technology of DC electric arc furnace and oven method, which is applied in the direction of lining repair, etc., which can solve the problems of high fuel cost, oven failure, and high safety risk, so as to save fuel and gas costs, reduce oven cost, and simplify oven operation Effect
Inactive Publication Date: 2015-10-14
龙佰武定钛业有限公司 +1
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Problems solved by technology
[0003] This oven method has the following disadvantages: ① Two oven methods are used, the operation is complicated, and multiple burners need to be installed on the top of the furnace to obtain a uniform heating effect
However, after the gas or fuel oven stage is over, the burner on the furnace top needs to be removed in a high-temperature environment, which has high safety risks and complicated operations
②The water generated during the combustion and drying stage may cause damage to the magnesia bricks in the furnace, resulting in failure of the furnace
③The cost of fuel is high. Compared with arc heating, fuel combustion efficiency is low, energy utilization rate is low, and cost is high
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0019] This embodiment relates to the oven operation of a large-scale DC electric arc furnace with a furnace capacity of 30MW, and the specific steps are:
[0020] (1) Lay a conductive refractory material with a thickness of 50-100mm on the newly built furnace bottom, and lay a conductive carbon block in the center of the furnace bottom. The height of the conductive carbon block is 1 meter or 1.5 meters. fill the whole bottom of the furnace;
[0021] (2) Place temperature-measuring thermocouples in the furnace cavity, discharge port, and furnace bottom to measure the oven temperature;
[0022] (3) Electrode energization and arc ignition, the initial power is 0.5MW, adjusted according to the heating rate of the thermocouple in the furnace, and each adjustment is not greater than 0.2MW;
[0023] (4) Periodically inspect the furnace conditions during the oven. When the iron blocks around the electrodes are melted to form a molten pool, measure the temperature and depth of the mo...
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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 [0001] The invention relates to a large-scale DC electric arc furnace drying method, in particular to the technical field of electric arc furnace direct transmission of electricity. Background technique [0002] The large-scale DC electric arc furnace adopts continuous smelting technology, which can operate at a stable temperature and prolong the service life of the electric arc furnace. However, the process of starting a large-scale electric arc furnace is relatively complicated. After the refractory materials inside the electric furnace are built, in order to ensure the performance of the refractory bricks, it is necessary to gradually increase the temperature according to the temperature curve, that is, the oven process, and the smelting can only begin after the oven is completed. The general oven method is to install a burner from the top of the furnace, and use gas or oil combustion to increase the temperature in the furnace. When the temperature in the ...
Claims
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IPC IPC(8): F27D1/16
Inventor 汪云华邹捷刘平王倩杨浩李波张加俊常强
Owner 龙佰武定钛业有限公司