Preheating ignition method and device for electric melting furnace

Abstract

The invention provides a preheating ignition method and device for an electric melting furnace. The preheating ignition method and device are used for producing rock wool by using red mud. A large-power nickel-chromium resistance wire is additionally introduced to a point discharge point of a three-phase graphite electrode for preheating and serving as an ignition device to dry the interior of a novel electric melting furnace, preheat furnace materials and realize stable transition after electric arc ignition through the three-phase electrode. The electric melting furnace is high in electric arc ignition speed, steady one-time arc ignition can be achieved, the three-phase current is balanced, and automatic or manual control can be realized. The voltage and the current do not fluctuate severely. Unstable electric arc burning does not exist. Short circuit and arc breaking are avoided. The preheating ignition method and device have no impact on a power grid and are free of harmonic pollution in the implementation process.

Description

technical field [0001] The invention relates to the technical field of electric melting furnace ignition, and more specifically relates to a preheating ignition method and device for an electric melting furnace. Background technique [0002] At present, there are two types of representative melting furnaces on the market: the first type is a fuel-burning melting furnace, and the second type is an electric melting furnace. The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., and its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated. The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs. The electric melting furnace is widely used because of its advantages of less pollution and high degree of automation. [0...

AI Technical Summary

Problems solved by technology

The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated

The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs.

[0004] However, there are the following problems in the arcing and ignition method of the electric melting furnace at the beginning of operation: first, the three-phase electrodes are inconsistent in arcing inside the electric melting furnace, resulting in an unbalanced three-phase current, and it is an instantaneous irregular three-phase current imbalance , which will cause malfunction of electrical equipment; second, the three-phase electrodes have intermittent arcing inside the electric melting furnace, sometimes short-circuited, sometimes arc-broken, the arc combustion is unstable, and the voltage and current fluctuate greatly, which requires repeated points The arc will cause a great impact on the power grid, and may generate high-order harmonics that will pollute the power grid and affect the safe operation of the power grid

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