What is the Difference Between Induction Furnace and Electric Arc Furnace?

What is the Difference Between Induction Furnace and Electric Arc Furnace?

The induction furnace is a power supply device that converts the power frequency 50HZ alternating current into an intermediate frequency (above 300HZ to 20K HZ). It converts three-phase power frequency alternating current into direct current after rectification and then converts direct current into adjustable intermediate frequency current. The medium-frequency alternating current flowing through the capacitor and the induction coil generates high-density magnetic force lines in the induction coil, and cuts the metal material contained in the induction coil, generating a large eddy current in the metal material.

This eddy current also has some properties of the intermediate frequency current, that is, the free electrons of the metal itself flow in the metal body with resistance to generate heat. For example, if a metal cylinder is placed in an induction coil with an alternating intermediate frequency current, the metal cylinder is not in direct contact with the induction coil, and the temperature of the energized coil itself is already very low, but the surface of the cylinder is heated to red or even melted. , and this speed of redness and melting can be realized only by adjusting the frequency and the strength of the current. If the cylinder is placed in the center of the coil, the temperature around the cylinder will be the same, and the heating and melting of the cylinder will not produce harmful gases or pollute the environment with strong light.

Intermediate Frequency Furnace Series Induction Melting Furnace Features:

(1) High melting efficiency, good power-saving effect, compact structure, and strong overload capacity

(2) The temperature around the furnace is low, there is less smoke and dust, and the working environment is good.

(3) The operation process is simple and the smelting operation is reliable.

(4) The metal composition is uniform.

(5) The melting temperature rises quickly, the furnace temperature is easy to control, and the production efficiency is high.

(6) The utilization rate of the furnace is high, and it is convenient to replace the variety.

(7) The long arc-shaped yoke shields magnetic flux leakage and reduces external reluctance. There is magnetic flux leakage at both ends of the shielded coil. The cross-section of the yoke is arc-shaped. Got better support. The unique positive and negative rotation coils greatly improve the efficiency of the system.

Intermediate Frequency Furnace Series Diathermy Induction Furnace Features:

●Fast heating speed, high production efficiency, less oxidation, and decarburization, saving material and forging die cost

●Superior working environment, improve workers' working environment and company image, no pollution, low energy consumption

●Uniform heating, extremely small temperature difference between core and surface, high-temperature control accuracy

The intermediate frequency furnace heating device has the advantages of small size, lightweight, high efficiency, excellent thermal processing quality, and a favorable environment. It is rapidly eliminating coal-fired furnaces, gas furnaces, oil furnaces, and ordinary resistance furnaces. It is a new generation of metal heating equipment.

The intermediate frequency furnace is the main equipment in the casting, forging, and heat treatment workshop. Its working stability, reliability, and safety are the guarantee for the normal and stable operation of the casting, forging, and heat treatment production line in flow operation.

Electric Arc Furnace

An electric furnace that smelts ores and metals using the high temperature generated by the electrode arc.

When the gas discharge forms an arc, the energy is very concentrated, and the arc temperature is above 3000°C. For smelting metals, the electric arc furnace is more flexible than other steelmaking furnaces. It can effectively remove impurities such as sulfur and phosphorus. The furnace temperature is easy to control and the equipment occupies a small area. It is suitable for smelting high-quality alloy steel.

Electric arc furnaces can be divided into three-phase electric arc furnaces, consumable electric arc furnaces, single-phase electric arc furnaces, and resistance electric arc furnaces according to the arc form.

The furnace body of the electric arc steelmaking furnace is composed of a furnace cover, a furnace door, a tapping trough, and a furnace body. The furnace bottom and furnace wall are built with basic refractory materials or acidic refractory materials.

Electric arc steelmaking furnaces are divided into ordinary-power electric arc furnaces, high-power electric arc furnaces, and ultra-high power electric arc furnaces according to the transformer capacity per ton of furnace capacity.

Electric arc furnace steelmaking is to input electric energy into the electric arc steelmaking furnace through graphite electrodes and uses the arc generated between the electrode end and the charge as the heat source for steelmaking.

The electric arc furnace uses electric energy as the heat source, and the atmosphere in the furnace can be adjusted, which is extremely beneficial for smelting steel types that contain more easily oxidizable elements. Shortly after the invention of electric arc furnace steelmaking, it was used to smelt alloy steel and has been greatly developed.

With the improvement of electric arc furnace equipment, the improvement of smelting technology, and the development of the electric power industry, the cost of electric arc furnace steelmaking continues to decline. Now electric arc furnace steelmaking is not only used to produce alloy steel, but also used to produce ordinary carbon steel in large quantities. The proportion of output in the total steel output of major industrial countries has been rising.

In the unit consumption of the electric furnace steel process in item 9 of the "Maximum Limits of Nine High Power Consumption Products and Domestic Comparatively Advanced Indicators" issued by the state, the comparatively advanced value of ordinary steel in 2005 is 500 degrees/ton, and the limit is 600 degrees/ton; In 2005, the relatively advanced value of special steel was 600 degrees/ton, and the limit was 650 degrees/ton; the relatively advanced value of casting electric furnace steel was 500 degrees/ton, and the limit was 700 degrees/ton.

The cost of an electric arc furnace is very expensive, but the product quality is good, the public frequency furnace consumes the most electricity, the intermediate frequency furnace below 2000KW is 800-900 degrees/ton, and the large furnace is 600-700 degrees/ton. These are just normal conditions, plus human factors ( Operating proficiency, equipment maintenance level), equipment aging, various compensations, harmonic control, and other factors that will affect power consumption.

Compared with electric arc furnaces, the cost of steelmaking in intermediate-frequency furnaces is lower, and it is suitable for small and medium-sized enterprises (small workshops). However, the steel produced by it has many impurities and high carbon content, so the steel produced is impure, and those with low requirements can choose For the steel made by an intermediate frequency furnace, the volume of an electric arc furnace is generally more than 3 tons, so only enterprises with a certain scale can use electric arc furnace, and the steel produced by it is relatively pure.

The electric arc furnace uses power frequency electricity, while the intermediate frequency electric furnace uses intermediate frequency electricity.