Today, we mainly explain how to improve the energy-saving measures of induction melting furnaces from the selection of induction melting furnace transformers and the correct configuration of induction melting furnace capacity .

Induction melting furnace should use special transformer

At present, due to the provisions of the power supply policy, the transformers used for industrial power are generally S7 and S9 power transformers , and the secondary voltage output is 380V , while the secondary output voltage of foreign industrial electric furnaces is 650V~780V . The special transformer for induction melting furnace makes the secondary output voltage 650V . When the output power is constant, the output current is reduced to 0.585 times, and the copper loss is reduced to about 1/3 of the original. The further reduction of copper loss reduces the heat generation of the transformer, so that the resistance of the copper coil is not too high. As a result, the cooling system takes away heat and the energy saving effect is significantly increased. In addition, according to the need , the power supply voltage can be adjusted in time during the operation of the furnace to adjust the input power of the furnace, so as to minimize the loss of the intermediate frequency induction furnace. Therefore , it is imperative to use a special transformer for medium frequency induction melting furnace to increase the voltage potential . 

In addition, limiting the no-load operation of the transformer also plays a role in energy saving. In practical applications , when the dead time exceeds several hours or when the production is stopped , the power should be pulled off and the operation of the transformer should be stopped in time , which is more conducive to energy saving and consumption reduction of the transformer and improvement of the power factor.

Correctly select the capacity of the induction melting furnace and increase the matching power

The choice of furnace capacity is generally based on whether the productivity of the furnace can meet the requirements of molten iron. However, for the same amount of molten iron, it is possible to select a single large-capacity furnace or a plurality of smaller-capacity furnaces, which must be analyzed and compared according to actual requirements. Where it is only necessary to use a large amount of molten iron for the production of large-scale special parts, it is not advisable to use a single large-capacity furnace, but multiple furnaces of appropriate capacity should be selected under normal production requirements. In this way, the flexibility and reliability of the production process can be improved, the production stoppage caused by an accident of a single large-capacity medium-frequency induction electric furnace can be solved, and the consumption caused by the excessive capacity can not be reduced when the small amount of molten iron is smelted. Electricity.

The capacity of the induction melting furnace is closely related to the technical and economic indicators of the furnace. Generally speaking, the technical and economic indicators of the large-capacity furnace are high, because the unit energy loss of the molten cast iron is relatively reduced as the furnace capacity increases. IF coreless induction melting furnace main technical parameters and technical and economic indicators , as shown in Table 1 listed. The furnace capacity has been increased from 0.15 tons to 5 tons , and the power consumption has been reduced from 850 kWh / ton to 660 kWh / ton. The ratio of rated power to rated capacity ( ie , the power matched to smelting 1kg of steel ) is a sign of the smelting time of the medium frequency induction melting furnace and the power consumption of the melting. When the ratio is large , the melting time is short , the power consumption is small, and the melting rate is high : on the contrary , the melting time is long , the power consumption is large, and the melting rate is low. Thus , in the same kinds of furnace capacity , it should be increased to match the power frequency induction furnace , to increase the melting efficiency of the furnace , to reduce its power consumption.

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 and enhance the use of medium frequency induction furnace results 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.