Multi-loop direct-current submerged arc furnace without bottom electrode

Abstract

The invention discloses a multi-loop direct-current submerged arc furnace without a bottom electrode. The multi-loop direct-current submerged arc furnace without the bottom electrode comprises a maincontrol cabinet, an operating table, a rectifier, a transformer, a furnace body, an electrode group and electrode holders, wherein the main control cabinet is used for collecting the digital quantityand the analog quantity of a field and carrying out automatic control on the submerged arc furnace; the operating table is connected to the main control cabinet, and is provided with a brake opening and closing switch, an automatic start-stop button, an emergency stop button, an indicator lamp, a computer used for data recording and statistics and archiving, the rectifier is connected to the maincontrol cabinet and can convert an alternating current into a direct current, the transformer is connected with the commercial power transmission and the rectifier and can carry out voltage reductionisolation processing on the high voltage, and the furnace body is used for forming a high-temperature-resistant container so as to contain furnace burden; and the electrode group comprises an anode and a cathode which are arranged in the furnace body, and the electrode holders comprise the first electrode holder and the second electrode holder. According to the multi-loop direct-current submergedarc furnace without the bottom electrode, a direct current loop is formed by connecting a rectifier positive pole, a short net, the anode, the furnace burden, a negative pole and a rectifier negativepole, the bottom electrode or a side electrode is not needed, so that the cost of the submerged arc furnace in production can be saved.

Description

technical field [0001] The invention relates to the technical field of submerged arc furnaces, in particular to a multi-circuit bottomless electrode direct current submerged arc furnace. Background technique [0002] At present, the annual output of ferroalloy in China in 2017 has reached more than 35 million tons, and the capacity of submerged arc furnaces in the world is increasing year by year. In the development process of submerged arc furnaces, the production of ferroalloys in three-phase AC submerged arc furnaces has developed rapidly, but With the substantial increase in the capacity and power level of AC electric furnaces, it is found that AC electric furnaces have some deficiencies in electrode consumption, power consumption, arc stability, noise, smelting time, etc. The higher the power, the more obvious the problem; while the DC electric arc furnace, DC Ladle furnaces and DC submerged arc furnaces account for very little in China, accounting for less than 1%, whi...

AI Technical Summary

Problems solved by technology

[0002] At present, the annual output of ferroalloy in China in 2017 has reached more than 35 million tons, and the capacity of submerged arc furnaces in the world is increasing year by year. In the development process of submerged arc furnaces, the production of ferroalloys in three-phase AC submerged arc furnaces has developed rapidly, but With the substantial increase in the capacity and power level of AC electric furnaces, it is found that AC electric furnaces have some deficiencies in electrode consumption, power consumption, arc stability, noise, smelting time, etc. The higher the power, the more obvious the problem; while the DC electric arc furnace, DC Ladle furnaces and DC submerged arc furnaces account for very little in China, accounting for less than 1%, while in some developed countries DC submerged arc metallurgy accounts for more than 10%. Of course, DC submerged arc furnaces currently in commercial operation also exist Such and other problems, such as electrode roasting, for example, when the power of the electric furnace rises to a certain capacity, the roasting of large-diameter electrodes will be very difficult

[0004] The above prior art uses three-phase electrode voltage, the current is prone to unbalance, the electrode consumption is high, and the service life of the furnace bottom is short, so the cost in the operation of the submerged arc furnace will be increased. Based on the technical problems existing in the prior art, the present invention proposes a A high-power multi-circuit bottomless electrode DC submerged arc furnace

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