With the diversification of cast iron grade varieties , and cast iron production requirements need to provide high-quality high-temperature molten iron , in order to further meet the needs of a competitive market economy , the development of multi-species, high-quality brand-name advantage of additional Zhi products , need to constantly consolidate and improve , improve, improve medium frequency induction furnace using effects in production . medium frequency induction furnace energy saving, new developments in melting , worthy of induction furnace design and branded manufacturers concern and attention , we must increase self-research and development efforts , supplemented by appropriate introduction Digestion, innovation and improvement , as soon as possible, China's induction melting furnace technology and equipment to a new level.

Several problems exist in the production of energy in medium frequency induction furnaces :

1 power supply voltage , the impact of transformer losses

Under different supply voltages , the losses of the transformer itself are different . It is beneficial to save energy by using a reasonable supply voltage and corresponding transformer.

2 medium frequency induction furnace has problems

1) Choice of different capacity and frequency : 

2) Matching of rated power : 

3) The influence of the purity and cross-sectional area of the induction line garden and hydropower system on power consumption :

4) The effect of scale and how to deal with the problem : 

5) The effect of cooling water temperature on power consumption : 

) Impact in terms of energy-saving stove village :

3 The effects of smelting ingredients, smelting process, smelting time, and maintenance of smelting equipment during the smelting process.

Analysis of the loss of each part of the intermediate frequency induction furnace

1. Nowadays, medium-frequency induction furnace manufacturers generally use S7 and S9 energy-saving power transformers, but their low voltage is not suitable for energy-saving of medium-frequency induction furnaces , which does not achieve good results.

2. The choice of the capacity, frequency and matching power rating of the medium frequency induction furnace by the steel manufacturer is not suitable for unnecessary loss.

3. At present, on the one hand, because the output of electrolytic copper can not meet the demand of consumption; on the other hand, the manufacturers of medium frequency induction furnaces use low-cost copper to replace the electrolytic copper No. 1 in order to reduce the cost , resulting in increased resistance of the power supply line. The loss is correspondingly increased.

4. The induction coil is a key part of the induction furnace and is the main body that delivers useful work to the heated or melted metal charge. The ability to transmit depends on the strength of the magnetic field generated by the current through the induction coil, ie the number of ampere-turns of the inductor. In order to obtain a large heating power, the current flowing through the inductor is very large. Over the years, the medium frequency induction furnace manufacturer has been using the traditional induction coil and water cable cross-section production mode, and generally adopts a conductive flow density of more than 25 A/mm 2 , an induction coil, The water cable has a small face. Due to the influence of power factor, after repeated measurement, the rated actual current of the furnace body is 10 times of the intermediate frequency output current ( capacitor full parallel type ) , and the copper loss is proportional to the square of the current, which will make the induction coil and water cable larger. The heat , the temperature is further increased, a large amount of electrical energy is converted into heat and was taken away by the circulating water, so that the power loss in the inductor can reach 20~30% of the active power of the intermediate frequency induction furnace .

The low temperature of the circulating cooling water induction coil resistance has a certain impact , high water temperature corresponding increase Zhi induction coil resistance , resulting in increased losses, a large heat capacity , and large amount of heat generated causes the water temperature , to form a vicious circle , of medium frequency induction furnace very negative energy.

6. The scale formed in the induction coil of the intermediate frequency induction furnace hinders the circulation waterway, and the cooling effect is reduced. The working temperature of the surface of the coil is high, so that the power consumption is increased, even if local overheating is caused, the coil is damaged, and the cooling scale has a certain potential, and the scale inhibition effect of the existing scale is not obvious.

7. The length of service life of the intermediate frequency electric furnace has an impact on the power consumption of the furnace. The long life of the furnace is less than that of the furnace. Therefore, the material selection and furnace drying process of the village should be improved.

8. The quality of the medium frequency induction furnace smelting process is also directly related to the power consumption of the electric furnace. There is considerable reason for whether the ingredients are reasonable, the length of the smelting time, and whether continuous smelting is caused , resulting in an unnecessary loss.

9. Some factories did not pay much attention to the maintenance of the medium frequency induction furnace , so that the furnace body, power supply system, etc. could not operate normally , and the corresponding losses increased.