During induction heating rapid heat treatment, the calculated unit energy consumption of steel is the energy consumed by direct heating. It does not include energy from variable frequency power systems and auxiliary equipment systems. In addition, the unit energy consumption during induction heating of steel varies with changes in heating temperature, holding time, electrical efficiency of the heating system and other factors. Therefore, when mutually evaluating the unit energy consumption of different heat treatment processes, the consistency of relevant conditions must be fully considered, otherwise comparison cannot be made.
At present, the unit energy consumption fraction of various types of steel materials during induction heating rapid heat treatment obtained under certain production or experimental conditions is as follows：
When the author was studying the induction heating rapid annealing treatment of cold-drawn steel, he used 2.5KHZ medium-frequency induction heating equipment. After being stepped down by the medium-frequency transformer, the carbon steel and low-alloy steel with a diameter of 12-24mm were heated through the inductor for continuous annealing. , the relationship between heating temperature and unit energy consumption is obtained, and continuous annealing is performed to obtain the relationship between heating temperature and unit energy consumption. The electrical efficiency of the medium frequency heating power supply heating system is 55% (including medium frequency transformer), the heating speed is 40 degrees Celsius per second, and the steel material is GCR bearing steel.
The single electric energy consumption value when heating directly with an inductor without going through an intermediate frequency transformer to reduce the voltage. The power loss of using a medium frequency transformer is 10%-16%.
During the rapid annealing process of medium frequency induction heating, the heating speed of the steel has a significant impact on the unit energy consumption. As the heating speed increases, the unit energy consumption decreases. The relationship between heating speed and unit energy consumption of GCR15 cold drawn material with a diameter of 18-22mm when annealed at 800°C. Rapid heating is an effective way to save energy. When possible, increasing the heating speed and using large surface heating power density are important ways to achieve rapid heating per unit energy consumption and save energy.
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GS-ZP-1200
