2×39MVA Ferrosilicon DC Submerged Arc Furnace

1.As an important smelting equipment, ferrosilicon submerged arc furnaces is widely used in steel, nonferrous metals and other industries. Its equipment features can be summarized as follows:

2.The furnace structure of ferrosilicon SAF is relatively simple, but very strong and durable.

3.Submerged arc furnaces usually use self-training electrodes or graphite electrodes, which have good electrical conductivity and high temperature resistance.

4.Ferrosilicon ore furnace use fuel combustion to provide heat energy. Commonly used fuels include coal, coke, liquefied gas, etc.

5.In addition to fuel combustion, ferrosilicon submerged arc furnace also use the high temperature of electric arc for heating.

6.Ferrosilicon furnaces require a lot of heat energy during operation, so the energy consumption is relatively high. In order to reduce energy consumption, measures such as optimizing the charge structure and improving thermal efficiency can be taken.

7.DC submerged arc furnace have more emissions, which cause certain pollution to the environment. 8.However, with the improvement of environmental awareness and the advancement of technology, many ferrosilicon submerged arc furnaces have been equipped with advanced flue gas treatment systems, such as dust collectors, desulfurization equipment, etc., to reduce pollution to the environment.

The maintenance of ferrosilicon smelting furnace is relatively convenient, mainly including replacement of electrodes, repair of furnace lining and other work. These works can be carried out without affecting production, ensuring the continuous and stable operation of the equipment.

In order to improve energy utilization efficiency, many ferrosilicon ore hot smelting furnaces are equipped with waste heat utilization systems. These systems can introduce the exhaust gas discharged from the electric furnace into the waste heat boiler for heat exchange and generate superheated steam, thereby saving fuel and achieving the purpose of economy and energy saving.

Furnace Body: Its composed of furnace shell, furnace lining, electrodes and other parts. The furnace shell is made of high-quality steel, the furnace lining is made of carbonaceous material or refractory material, and the electrodes are usually graphite electrodes or self-baking electrodes.

Power Supply System: It includes rectifier transformers, rectifiers and other equipment, which are used to convert AC power into DC power for use in ore furnaces.

Cooling System: Its used to cool the electrodes, furnace shell and other parts to prevent overheating damage. Water cooling is usually used.

Flue Gas Treatment System: Its used to treat the flue gas generated during the smelting process to reduce environmental pollution. It usually includes dust collectors, desulfurization equipment, etc.

Furnace body of submerged arc furnace: furnace body rotating mechanism, furnace bottom, furnace shell, tapping hole, etc.;

Tapping hole tapping exhaust system: smoke hood, smoke duct, and flue hanging, etc.;

Electrode holder of submerged arc furnace: the upper part of the electrode combined holder mainly includes: electrode lifting device, electrode clamping and pressing device, upper holder barrel and guide system, hydraulic press pipeline, etc. The lower part of the electrode combined holder mainly includes: lower holding cylinder, anti-magnetic stainless steel water-cooled protection screen, furnace conductive copper tube, copper tile, pressure ring and insulation system and other components.

Electrode hydraulic lifting system: The electrode lifting device adopts hydraulic hanging cylinder structure;

Secondary busbar system (short network system): The secondary busbar system includes: water-cooled compensator, water-cooled copper tube short network, water-cooled cable, insulation hanging device, low-voltage current transformer, etc.

Smoke hood and smoke exhaust system: It is composed of smoke hood, flue and water-cooled butterfly valve.

Water cooling system: It is composed of short net, water cooling cable, conductive pipe, copper tile, cooling water distributor, pressure, temperature and flow monitoring instrument, valve, water cooling pipe sump, etc.

Furnace top charging system: The furnace top charging system is composed of vibrating feeder, furnace charge conveying belt conveyor, reversible belt conveyor, mobile belt conveyor, silo and partition, material pipe and insulation, material pipe gate, material head, material level meter, etc.

Hydraulic system: The hydraulic system is composed of hydraulic pump station, electrode pressure release plate (valve station), accumulator, etc.

The ore-fired electric furnace adopts a semi-enclosed type, a copper tile pressure ring electrode holder, ventilation cooling at the bottom of the electric furnace, a rotating furnace body, furnace body temperature measurement, and a transformer with a long-term overload capacity of 20%. The short network system, copper tiles, and incoming cables all have a long-term overload capacity of more than 20%.

Reliable insulation is set up between the flue and the furnace cover.

The hydraulic system adopts a combination valve and an energy storage device.

The upper and lower ends of the electrode lifting cylinder are insulated for protection. All the insulation at both ends of the high-pressure oil pipe is designed to prevent electrode deflection. Insulation is set on the furnace cover, platform and electrode guide device, and the electrode guide device.

All pipelines are equipped with pipeline trenches for easy maintenance. The gate valve adopts stainless steel screw rods to increase its service life. Each group of manifolds is equipped with 3 spare water routes. The manifold valve adopts stainless steel or copper ball valves, and the manifold return water route is reasonably laid out.

The furnace cover adopts a frame-type water-cooled structure, and the central area is made of non-magnetic material.

A water-cooled section is set between the second and third floors of the electric furnace flue to reduce the flue gas temperature.