2T Induction Melting Furnace Electricity Saving Specific Transformation Method

1) IF power cabinet renovation, replace 8 original KK2000A2700V thyristors with 8 sets of KK25 / 25 thyristors; replace 14 original 1.4-2000-0. 5S electrothermal capacitor reactive compensation capacitors 1. 2-2000 -0. 5S electric heating capacitor; through this method, the inverter circuit of the electric control cabinet is modified, the integrated circuit board is adjusted, the reactive power compensation capacitor is increased, the power factor of the original induction melting furnace is increased from 0.92 to 0.97, and the T casting of the induction melting furnace is reduced. Power consumption

2) The 2 T induction melting furnace uses a 1250 kVA transformer instead of a 1600 kVA transformer, and this method reduces the monthly landline cost of the transformer;

The specific transformation methods are as follows:

1. By improving the control circuit of the induction melting furnace, replace the original KK2000A2700V thyristor with 8 sets of KK25 / 25 thyristors; control the melting power in the early stage and reduce power fluctuations. In the early smelting process, due to the small amount of molten steel in the furnace, most of the power cannot be raised, and it is not used on the charge, which is all converted into useless work and wasted. Through this complete set of induction melting furnace circuit transformation, the power of the entire melting process of the 2T induction melting furnace can be controlled between 1600-1800KW and maintained stable. After the transformation, the waste power loss of the previous melting is reduced, and the input power and active power are matched. , Reduces power loss, and achieves the purpose of power saving. Before the transformation, the original output power range of the induction melting furnace fluctuated between 1200-1800KW, the power was unstable, and the fluctuation range was large, resulting in excessive useless power loss in the early stage of melting;

2. Increase the power factor of the induction melting furnace from 0.92 to 0.97 to achieve energy saving purposes. One of the major transformation contents is to replace the original 10 1.2-2000-0. 5S electric heating capacitors with 14 1.4-2000-0. 5S electric heating capacitor reactive compensation capacitors, and improve the power factor of the induction melting furnace from 0.92 to 0.97, power factor is defined as the ratio of active power to apparent power. The higher the power factor, the higher the utilization of electrical energy. Theoretical analysis shows that the power factor of a purely resistive circuit is 1, and the power utilization rate is 100%; the power factor of a pure capacitor or purely inductive circuit is 0, and the power utilization rate is 0, that is, no energy is consumed. However, energy is lost when it is converted into capacitance and inductance. This part of power is called reactive power. If the power factor is too low, the reactive power is large and the active power is small, and power compensation is required. Because capacitance and inductance are relative, if the circuit is capacitive, use inductance compensation, and inductive use capacitor compensation. As can be seen from the introduction of the induction melting furnace, the induction melting furnace is an inductive circuit, which needs to be compensated by a capacitor;

3. Under the measures of points 1 and 2, reduce the power of the input transformer of the induction melting furnace, choose a smaller power transformer, and replace the original 1600 kVA transformer with the 1250 kVA transformer in the 2T induction melting furnace, saving the base unit. cost. Generally speaking, in a two-terminal network, improving the power factor of the consumer has two meanings. One is to reduce the power loss on the transmission line; the other is to make full use of the power equipment (such as generators, transformers, etc.). potential. Because the consumer always works under a certain voltage U and a certain active power P, it can be known from the formula P-UI that the power factor is too low, it is necessary to use a larger current to ensure the normal operation of the consumer, and at the same time the transmission line The power transmission current increases, which results in increased Joule heat loss on the line. In addition, the voltage drop across the resistance of the transmission line and the inner group of the power supply is proportional to the current in the consumer. Increasing the current will necessarily increase the voltage loss inside the transmission line and the power supply. Therefore, increasing the power factor of the consumer can reduce the transmission current, thereby reducing the power loss on the transmission line. In other words, you can choose a transformer with a lower power to achieve the purpose of saving landline fees.

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