Method for directly transmitting power to bake large-scale direct current electric arc furnace

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 present invention involves a method of baking in a large DC arc furnace, especially involving the field of electricity oven in the field of electricity -stoves. Background technique [0002] The large DC arc furnace adopts continuous smelting technology, which can run at a stable temperature and extend the service life of the arc furnace.However, the opening process of large -scale arc furnaces is relatively complicated. After the internal refractory material of the electric furnace is well -built, in order to ensure the resistance of the refractory brick, it is necessary to gradually heat up according to the temperature curve, that is, the oven process, and it can start smelting after the oven.The general way of drying is to install a burner from the top of the furnace, and use the combustion of gas or fuel to increase the temperature in the furnace. After the temperature in the furnace reaches 1200 ° C, send the electrode to the electrode.Burger at th...

AI Technical Summary

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