Mineral Heat Furnace Plant Design, Installation and Commissioning

Introduction to Mineral Heat Furnaces:   Mineral heat furnace is also known as electric arc electric furnace or resistance electric furnace. It is mainly used for reducing smelting ores, carbonaceous reductants and other raw materials. It mainly produces ferrosilicon, ferromanganese, ferrochrome, ferrotungsten, ferronickel, silicomanganese alloy and other ferroalloy materials, which are important industrial raw materials in metallurgical industry and chemical raw materials such as calcium carbide.
Its work is characterised by the use of carbon or magnesium refractory materials as furnace lining and the use of self-cultivated electrodes. Electrode inserted into the charge for submerged arc operation, the use of the energy of the arc and the current through the charge, due to the resistance of the charge and the energy generated to melt metal, successive charging, intermittent out of the iron slag, continuous operation of a kind of industrial electric furnace. Mineral heat furnace transformer load continuous, smooth, low impedance voltage, regulator level is more, the level difference is small overload capacity. Can be divided into two kinds of on-load, non-excited voltage regulation. Generally the first few levels of constant capacity output, after a few levels of constant current output.
Mineral Heat Furnace Structure Characteristics.    Mineral heat furnace is a kind of industrial electric furnace with huge power consumption. It mainly consists of furnace shell, furnace cover, furnace lining, short net, water-cooling system, smoke exhaust system, dust removal system, electrode shell, electrode pressure release and lifting system, loading and unloading system, handle, burn-through, hydraulic system, transformer of the mineral heat furnace and all kinds of electrical equipment and so on.
According to the structural characteristics of the mineral heat furnace as well as the working characteristics, 70% of the system reactance of the mineral heat furnace is generated by the short-net system, and the short-net is a high-current working system, the maximum current can reach tens of thousands of amperes, so the performance of the short-net determines the performance of the mineral heat furnace, and it is due to this reason, so the natural power factor of the mineral heat furnace is difficult to reach more than 0.85, and the vast majority of furnaces have a natural power factor of The vast majority of furnaces have a natural power factor of 0.7 to 0.8, the lower power factor not only makes the efficiency of the transformer decline, consume a lot of useless power, and the power department to add additional power fines, and at the same time, due to the electrode of artificial control and stacking process, resulting in the increase of the power imbalance between the three-phase power, the highest imbalance can reach more than 20%, which leads to the low efficiency of the smelting, the high cost of electricity, and therefore to improve the power factor of short grid, reduce grid imbalance. Therefore, improving the power factor of the short network and reducing the imbalance of the power grid becomes an effective means to reduce energy consumption and improve smelting efficiency. If you take appropriate means to improve the power factor of the short network, you can achieve the following results: reduce power consumption by 5-20%; increase production by 5-10% or more.
Mineral heat furnace equipment use:
Mineral heat furnace is mainly used for the production of ferroalloys (such as ferrotungsten, high carbon ferromanganese. High-carbon ferrosilicon, high-carbon chromium, nickel-iron alloy) and industrial silicon, calcium carbide, corundum, yellow phosphorus and so on.
Mineral heat furnace equipment features:
Mineral heat furnace is divided into three kinds according to the way of power supply:
1) AC mineral heat furnace 2) DC mineral heat furnace 3) low frequency mineral heat furnace
3.Equipment Composition
Electric furnace mechanical system
Furnace shell and hood
Smoke exhaust system
Electrode system: electrode controller, electrode lifting mechanism and electrode pressure release device
Charging device
Hydraulic system
Short net system
Water circulation system
Iron casting system
Furnace Electrical Systems
Furnace Transformer
High-voltage control and protection system
Low-voltage control and protection system
Computer control system