Introduction:
Furnace is an appliance used for heating or melting materials. It is mainly used in industries to achieve their products. There are many types of furnaces of them, blast furnace, electric arc furnace, induction furnace are the most used ones. Especially induction furnace is widely used in many industries mostly steel plants due to its advantages over the rest.
Induction furnace uses the law of induction in heating the element. It uses electricity to heat elements that are conductive in nature. Since it is a non-contact heating process, it does not contaminate the material that is being heated. It is very efficient as the heat is generated inside the work piece. This can be contradicted with other furnaces where the heat is produced from an external flame and then induced it to the work piece. These advantages mark induction heating to a unique application in the industry.
Here in this review I am going to highlight the control techniques and advantages of the electric induction furnace used in steel melting.
Review:
When there is a change in the magnetic field near a material which is electrically conductive, there will be a current produced in the material know as eddy current. This eddy current is responsible for the heating of the material. The amount of eddy currents produced in the conductor depends mainly on the external magnetic field. Heat generation can be controlled by the magnetic field as the heat generated in the element is directly proportional to the current which depends on the magnetic flux. So heat is indirectly controlled by the magnetic flux.
Our aim is to vary the magnetic flux. This process is similar to that of a transformer. In a transformer current is controlled by voltage. Similar to t...
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...nstruction and is very costly.
Older controlling techniques use 16 pulse or 8 pulse rectifiers which are now replaced by 24 pulse rectifiers, which makes it effective in power factor regulation.
Advantages of induction furnace:
• Robust and simple in construction
• Cost effective
• Can reach up to peak temperatures in no time
Conclusion:
Furnaces are designed considering many factors; some of them are efficiency, cost, construction etc. Induction furnace with a 24 pulse converter can solve these problems many industries are now actually facing. Desired temperatures can be attained within no time.
Bibliography:
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=756150&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D756150
Electron. vol. 51, No. 3, June 2004, 641-660. [5] S. Choi, ―New pulse multiplication technique based on six pulse.
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