Closed non-fixed anode direct-current submerged arc furnace

Abstract

The invention provides a closed non-fixed anode direct-current submerged arc furnace. The closed non-fixed anode direct-current submerged arc furnace comprises a furnace body, a furnace cover, an electrode column system, a feeding system, a flue gas leading-out system, a power supply system, a cooling water system and a hydraulic system, wherein the furnace body is used for containing furnace burden, the electrode column system is used for heating and melting the furnace burden by utilizing a direct-current arc, comprises a cathode and an anode, and the cathode and the anode can freely adjustthe depth inserted into the furnace burden; and the furnace cover used for ensuring the sealing of the furnace body is arranged above a furnace shell of the furnace body, and the furnace cover and thefurnace shell are subjected to sealing treatment. According to the closed non-fixed anode direct-current submerged arc furnace, a submerged arc furnace gas with relatively high CO concentration is generated after the submerged arc furnace is sealed, can be used as fuel for power generation, roasting, hot-blast stove and the like after being purified and recycled, so that the utilization value isextremely high, and the comprehensive energy consumption can be reduced; and almost no air enters a hearth, the oxidation of the electrode is slow, the loss is low, both the cathode and the anode canmove up and down, are inserted into the solid furnace burden, not in direct contact with a high-temperature molten liquid, the structure is simple, the equipment is reliable in operation and failure rate is low.

Description

technical field [0001] The invention relates to the technical field of smelting equipment, in particular to a closed direct current submerged arc furnace without a fixed anode. Background technique [0002] Almost all DC submerged arc furnaces that have been used at present are non-closed submerged arc furnaces. Because a large amount of cold air enters, part of the heat is taken away, and the electrode oxidation is fast and the loss is large. Most of the traditional DC submerged arc furnaces are powered by fixed anodes, that is, the cathode is on the top and the anode is on the bottom. The heat is only transferred vertically from top to bottom, the area of ​​heat radiation is small, and the utilization rate of powder is low. The fixed anode is embedded in the lining of the furnace substrate or the side wall, and is in the environment of high-temperature molten liquid for a long time. The life of the fixed anode and the lining is short, the operation is unstable, the failure...

AI Technical Summary

Problems solved by technology

Most of the traditional DC submerged arc furnaces are powered by fixed anodes, that is, the cathode is on the top and the anode is on the bottom. The heat is only transferred vertically from top to bottom, the area of ​​heat radiation is small, and the utilization rate of powder is low.

The fixed anode is embedded in the lining of the furnace substrate or the side wall, and is in the environment of high-temperature molten liquid for a long time. The life of the fixed anode and the furnace lining is short, the operation is unstable, the failure rate is high, and the maintenance is difficult.

When smelting, open arc smelting is mostly used, and the electrode tip is not inserted into the charge, so the heat loss is large, the recovery rate of elements is low, and the production efficiency is not high

The feeding method is mostly manual feeding or intermittent feeding, and manual control operation is still required

[0003] Although the DC submerged arc furnace has many advantages such as no reactance, high power factor, and high DC arc temperature, the existing DC submerged arc furnace still has unstable operation, high failure rate, low powder utilization rate, and high comprehensive energy consumption. , low recovery rate, poor working environment for workers and high work intensity, etc., so the advantages of DC submerged arc furnace have not been fully utilized, and have not been widely used so far.

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