Energy-saving intermittent pulse-feeding technology of closed submerged arc furnace

Abstract

The invention relates to an energy-saving intermittent pulse-feeding technology of a closed submerged arc furnace. The feeding method of the closed submerged arc furnace is a smelting intermittent pulse-feeding mode of the closed (semi-closed) submerged arc furnace, which is proposed after various smelting principles and a plurality of special factors are deeply researched and can be applied to the smelting of calcium carbide, yellow phosphorus, silicon-based metal alloys (ferrosilicon, calcium silicon, barium ferrosilicon, metallic silicon, and the like), manganese-based metal alloys (ferromanganese, silicon manganese, metallic manganese, and the like), nickel-based metal alloys, chrome-based metal alloys, tammite, ferrotitanium, and the like or other smelting. The technology enables a domestic closed furnace using general raw materials to lower the power ton consumption by 3-10 percent and increase the yield by 2-20 percent and benefit the safe and stable operation of subsequent environment-friendly dedusting equipment and the implementation of an unmanned control technology of submerged arc furnaces, thereby having a profound popularization meaning and development potential on various large-scale closed submerged arc furnaces over 25*10<6> VA.

Description

technical field [0001] The present invention is a new type of feeding technology for smelting of closed submerged arc furnaces. For the smelting or submerged arc furnace industry, the change of its feeding method and feeding interval will directly affect its smelting process, electrode insertion, and directly affect the smelting effect and Energy consumption for smelting. [0002] The airtight furnace of this invention includes all calcium carbide, yellow phosphorus, silicon series (ferrosilicon, silicon calcium, silicon barium, metal silicon, etc.), manganese series (manganese ferromanganese, silicon manganese, metal manganese, etc.), or chromium series, nickel series, tungsten series, etc. Iron, ferro-titanium and other closed submerged arc furnaces using electrodes and non-electrodes, the power supply mode is DC, low frequency AC, medium frequency, high frequency AC, or plasma smelting furnace, electromagnetic smelting furnace and other new energy sealed submerged arc furna...

AI Technical Summary

Problems solved by technology

[0003] Since the birth of various closed submerged arc furnaces abroad, they were introduced into my country in the middle and late 1980s, and have become the national standard for the development and promotion of various smelting industries. In case of accident or shutdown, the material is cut off manually through the reserved plunger valve (a manually operated valve with four to five small iron pillars dismantled into the feeding pipe, which cannot realize automatic control and remote control). There are many shortcomings in this method during operation and furnace condition adjustment, mainly because when the furnace electrode is lifted up, it is impossible to use proper dry burning to lower the material level, so as to achieve a better deep insertion of the closed furnace electrode.

For many closed furnaces that consume a lot of power in smelting, such as 75 ferrosilicon, metal silicon, silicon calcium and silicon manganese, calcium carbide, yellow phosphorus, etc. (other smelting currently has few closed furnaces in China), the continuous feeding of closed furnaces makes long-term accumulation The raw materials in the upper part of the furnace are baked by the furnace gas and heated up by heat transfer, resulting in a decrease in the material resistance and making it difficult to insert the electrodes. Therefore, the current domestic large-scale closed furnace smelting consumes a lot of electricity per ton, and the furnace has many faults, and the smelting consumes a ton Electricity and production stability and continuity are far lower than traditional open furnaces, and it cannot reflect the scale benefits of large closed furnaces, which restricts the development and promotion of closed submerged arc furnace technology

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