Overview and application of intermediate frequency furnace

The intermediate frequency furnace is a frequency conversion device that converts three-phase power frequency current into a single-phase intermediate frequency current. The eddy current loss of metal is induced by electromagnetic field induction, and the purpose of heating and melting is achieved. It is widely used for smelting and heating non-ferrous metals. Such as smelting pig iron, ordinary steel, stainless steel, tool steel, copper, aluminum, gold, silver and alloys. The intermediate frequency furnace is the main equipment of the foundry workshop. The stability, reliability and safety of its work are the guarantee for the normal and stable operation of the foundry production line of the pipeline operation.

Performance characteristics

The medium frequency induction furnace designed by Guangdong Qifeng Electric Furnace Manufacturing Co., Ltd. has the following characteristics:

1. The component layout of the power control system with constant power output is coordinated and reasonable, and the maintenance is convenient. It has a complete protection system for overvoltage, overcurrent, undervoltage, water shortage, phase loss, voltage limiting and current limiting, thus ensuring the reliable use of the equipment. Sex and work stability

1. The zero-voltage scanning soft start mode can be started or stopped at any time in any state without impact on the power supply;

2. Fast melting and low production cost; low pollution, in line with national environmental protection requirements, is a new generation of metal smelting and heating equipment;

3. It can be directly melted from the cold furnace, the solution can be emptied completely, and it is convenient to change the melt material;

4. The power adjustment is flexible and convenient, and can be continuously and smoothly adjusted; the temperature is uniform and easy to control, the oxidation burning is less, and the metal composition is uniform;

5. The furnace shell is made of cast aluminum alloy or steel structure, which occupies a small area, light weight, high efficiency and excellent thermal processing quality. The furnace body is easy to turn and dump. Manual, electric and hydraulic furnace tilting methods can be selected.

Qifeng Medium Frequency Electric Furnace Selection Guide

First, the choice of intermediate frequency power supply

  1. KGPS SCR parallel intermediate frequency power supply

         Advantages: Widely used, low price, easy maintenance, and cheap accessories.

         Disadvantages: higher energy consumption, electricity consumption per ton of molten steel is greater than 600 degrees. The power is adjusted by adjusting the DC voltage, and the power factor is about 0..9.

  2. IGBT series intermediate frequency power supply

         Advantages: Full-wave rectification is adopted for rectification, and LC filtering method composed of capacitor and inductance is adopted to make the power factor reach above 0.96, and there is basically no harmonic interference. The inverter part adopts series inverter working mode. When the load works under high voltage and small current, the copper loss is small, which greatly improves the efficiency. Electricity consumption per ton of molten steel is less than 600 degrees.

         Disadvantages: IGBT power supply has high requirements on working environment and high maintenance cost.

Second, the choice of aluminum shell furnace and steel shell furnace

         Aluminum shell furnace body: low price, easy maintenance, and convenient observation. The disadvantage is that the electromagnetic radiation is not shielded,

         Steel shell furnace body: Welded with high-quality steel structure, there is a leak-proof furnace alarm device, and the sensor is closed with a magnetic yoke, covering more than 65% of the area. Reduced magnetic leakage and improved thermal efficiency, saving about 5% -8% compared with aluminum shell furnace body.

Third, the choice of cooling equipment

1. Closed cooling tower (recommended)

  • Light weight and small footprint. Move and place at will; use directly. There is no need to dig a pool. There is no need to install cooling towers, pumps, pipes, etc., which is environmentally friendly and energy-saving, and can save the price difference between closed and open towers within three years.

  • Fully enclosed soft water circulation cooling to prevent pipeline clogging caused by debris; avoid scaling of electrical components, which can greatly reduce the failure rate of the intermediate frequency furnace and extend the service life of the equipment;

  • Automatic digital display temperature control, energy saving and environmental protection, easy installation and operation, simple maintenance;

2. Pool + water pump + open cooling tower The water in the pool is pressurized into the equipment through the pump, and the effluent flows back to the pool for recycling. The cooling tower distributes the heat in the water, and the cooling tower cools the circulating water with strong wind, which can effectively increase the heat dissipation and reduce the user's pool;

3. Pool + water pump The water in the pool is pressurized by the water pump to enter the equipment, and the effluent flows back to the pond for recycling. Through flowing water, heat is naturally dissipated.