Energy-saving features of steel using medium frequency induction heating machine for induction heating heat treatment

We often say that the induction heating heat treatment of steel by medium frequency induction heating machine has the advantages of energy saving and environmental protection, but we don't know the characteristics of environmental protection and energy saving. Today, the editor will tell you about the characteristics of the energy saving of induction heating compared with resistance furnace and fuel furnace by using medium frequency induction heating machine to heat steel.

(1) Use induced current to directly heat steel. The principle of induction heating is based on the phenomenon of electromagnetic induction and the thermal effect of current, relying on the induced current generated inside the steel to rapidly heat from the surface to the inside. During the heating process, 86.4% of the current is directly heating the metal in the penetration layer, and the remaining 13.6% of the current is heating the metal in the inner layer of the metal. This direct heating method without heat transfer medium has high thermal efficiency and energy utilization. This form of heating is impossible with traditional heating forms and is a unique feature of induction heating.

(2) Induction heating can implement rapid heating with high energy flux density, and the energy flux density refers to the energy value applied to the unit surface area of the heated steel. The amount of energy applied is directly proportional to the rate at which the steel is heated. Under induction heating conditions, the energy flow density is the surface power density. When the steel is heated by an intermediate frequency induction heating machine, the greater the surface power density, the faster the heating speed of the steel, the corresponding shortening of the heating time, the corresponding reduction of heat loss, and the improvement of heat energy utilization. In terms of electric heating heat treatment of steel, induction heating is the heating method that provides the highest energy flow density. Electron beam and laser beam heating are only used for heat treatment of special parts. High energy flow density and rapid heating are important energy-saving ways for rapid heat treatment of steel by induction heating.

(3) The environmental heat loss during the induction heating process is small. Environmental heat loss refers to the heat lost from the heat source to the surrounding environment in the form of convection, conduction, radiation and latent heat during the heating process. Specifically, it includes heat dissipation loss, radiation heat loss, heat storage loss and overflow heat loss, etc. Compared with resistance heating furnaces, induction heating rapid heat treatment is similar to resistance furnace heat treatment in terms of dissipated heat loss and overflow heat loss (heat taken away by furnace gas and cooling water). However, it is far less than resistance furnace heat treatment in terms of heat storage loss and radiation heat loss. The main difference is that the volume-to-weight ratio of the inductor used for induction heating and the lining refractory material of the resistance furnace is too large, and the difference between the two is nearly a hundred times. A large amount of refractory materials are used in the masonry body of the resistance furnace and the oil furnace, which is the root cause of a large amount of heat storage loss. Nearly about 30% of the heat is lost in heating the furnace building refractories, and the amount of refractories used in induction heating is very small. In short, the environmental heat loss of induction heating is small, which is conducive to improving thermal efficiency and reducing unit energy consumption. The main heat loss during induction heating is the heat taken away by the cooling water, accounting for 10%-15%.

This article briefly introduces the energy-saving characteristics of steel induction heating. I hope that after reading this, you not only understand the energy-saving characteristics of steel induction heating, but also have a certain understanding of our medium frequency induction heating machine. Of course, if you still don't understand anything, you can consult our technical staff.