Application of Induction Heating for Disassembling Feed Pump Rotors

This chapter deals with some specific applications of induction and direct resistance heating, that have been investigated also by the authors of this book. When available, analytical solutions for these ‘special’ applications are provided. Section 4.1 is about the resistance heating of ferromagnetic workpieces of rectangular cross-section, Sect. 4.2 describes the direct resistance heating of bended conductors. The transverse flux heating is a technology that is applied for treating thin slabs and stripes with high electrical efficiency and is the topic of the Sect. 4.3. Planar coils, often named pancake inductors, are described in the Sect. 4.4, while the effects due to the finite length of inductor are discussed in Sect. 4.5. Induction hardening of workpieces of complex geometry is one of the most important applications of induction heating, single and dual frequency processes for contour hardening are presented in Sect. 4.6. The innovative process of through heating by rotating a nonferrous billet inside a DC field produced by superconductive coils is detailed in Sect. 4.7, while in Sect. 4.8 the induction heating is produced by rotation of permanent magnets. Section 4.9 deals with the induction heating of hollow workpieces heated by internal inductors and Sect. 4.10 describes the forces acting in induction heating applications.

Prevalent converters for induction heating (IH) applications employ two-stage conversion for generating high-frequency magnetic field, namely, AC to DC and then DC to high-frequency AC (HFAC). This research embarks upon a direct conversion of utility AC to high frequency AC with the design of a single-phase matrix converter (SPMC) as a resonant converter using a modified switching technique for IH application. The efficacy of the proposed approach is validated through different attributes such as unity power factor, sinusoidal input current and low total harmonic distortion (THD). The developed prototype-embedded system has high pragmatic deployment potential owing to its cost effectiveness using Arduino mega 2560 and high voltage/current as well as low switching time IXRH40N120 insulated-gate bipolar transistor (IGBT). Different results of the prototype-embedded system for IH application have been verified using Matlab Simulink environment to corroborate its efficacy.

Plastic pyrolysis over HZSM-5 zeolite and fluid catalytic cracking catalyst under ultra-fast heating

<div class="htmlview paragraph"><b>INDUCTION heating is a process or method by which metal parts are heated by simply placing them in an alternating magnetic field</b>.</div> <div class="htmlview paragraph"><b>The action is that of the transformer, whereby electrical energy is transferred or passed over to another isolated electric or secondary circuit by means of the magnetic field; thus, no physical attachments or electrical contacts are necessary to have electrical currents, which are dissipated as heat, flow in the parts to be processed</b>.</div> <div class="htmlview paragraph"><b>The strength and frequency of the alternating magnetic field can be selected to produce any desired rate of heating and ultimate temperature</b>.</div> <div class="htmlview paragraph"><b>A circuit can be set up to dry lacquer at 160 deg. fahr. on thin sheet-metal parts or to melt in record time immense steel ingots</b>.</div> <div class="htmlview paragraph"><b>Induction heating is now commercially applied in automotive production to many processes, and these are specified</b>.</div> <div class="htmlview paragraph"><b>The development of lower cost electrical apparatus suitable for induction heating has greatly stimulated its commercial use, and the field of application will rapidly expand as the many values of the process become better known</b>.</div>

This paper presents a new single-stage utility frequency ac (UFAC)-high frequency ac(HFAC) resonant power converter for high frequency induction heating(IH) applications. The newly-proposed ac-ac converter features a boost converter and full-bridge HF resonant inverter integrated circuit (Boost-Full-Bridge BFB) with a source voltage sensorless control scheme. The experimental results of a 3.0kW–40kHz prototype are demonstrated on zero voltage soft switching (ZVS) operations and steady-state characteristics based on the phase shift pulse-width-modulation (PS-PWM) power regulation, then the validity of the proposed ac-ac converter is revealed from a practical point of view.

The purpose of this paper is application of induction heating. Generally, Steam Heating and Resistance Heating are in use to heating Bunker Oil C. however, Heating Machine is hard to maintenance and maintenance cost is expensive, because both method are direct contact with oil.In this paper, we research for Bunker Oil C heating using induction heating. This way we avoid direct contact with oil and use LLC Resonant Circuit to reduce switching loss.KeywordsBunker Oil CInduction heatingLLC resonant

This paper investigates the evolution of temperature and stress during induction heating local postweld heat treatment (PWHT) of ultra-thick pressure vessels (with a thickness typically exceeding 300 mm) through electromagnetic-thermo-mechanical coupling simulations and experimental validation, aiming to develop an effective heat treatment method for ultralarge equipment. The effects of various inductive heating parameters including the cable winding width, the number of turns, the spacing, the winding method, the current density, and the current frequency on the temperature uniformity during the heat treatment holding time are studied. The results indicate that the maximum temperature difference is directly proportional to current density, but inversely proportional to frequency, winding width, and the number of turns. After local PWHT, the residual stress on the outer surface of backward-oriented pressure vessels can be effectively reduced, but the stress relief on the inner wall is relatively small. Furthermore, the influence of heated bandwidth on the reduction of residual stress is considered. If reducing residual stress on the inner wall is considered, the width of the heated band should exceed 3Rt. If aforementioned width cannot be achieved, the local PWHT by primary plus secondary heating method can be used to further reduce the residual stress. This research sheds light on the application of inductive heating in ultralarge pressure vessels.

Nowadays Induction heating (IH) technology is the heating technology of choice in modern domestic applications due to its high efficiency, fast heating, safety, and cleanness. With the development and improvement of power electronic devices, the technology of making this heating technology is more efficient and cost-effective. This paper presents a half-bridge series resonant inverter for induction heating (IH) application that works in two operating modes to improve the efficiency of this application in a wide power range. In this structure, to control the power output, changing the switching frequency is used for high power range, and pulse width modulation (PWM) is used for low power range, so that reduces the losses and increases the efficiency of the converter in all range power. The operating modes of the converter can be changed by changing the snubber and resonant capacitors through electromechanical switches. In order to show the feasibility, the simulated and experimental results for an IH rated on 1kw are presented.

Single-ended resonant inverter topology is widely used in domestic induction heating (IH) application due to its concise structure and cost effectiveness. Whereas high resonant voltage caused by the energy transfer between load inductor and resonant capacitor in the IH system may negatively affect the operation of system and long-term reliability. Generally, 1200 V rating IGBT is popularly used for single-ended IH cookers. However, abnormal conditions of AC supply suddenly increases the resonant voltage thereby IGBT can be destructed. Resonant voltage limiting technology is proposed by restricting the maximum current flow to the load inductor in order to relieve the voltage stress across the IGBT. The effectiveness of the proposed method is verified for AC supply distortion by using 1.35 kW single-ended IH system.

Fast pyrolysis of rice straw, sugarcane bagasse and coconut shell in an induction-heating reactor

Experience of the Minsk automobile plant and bearing plant in production, research and test of pilot batches of gear wheels of the drive axle of MAZ trucks and MZSh bearings from U8A steel with hardening by their volume and superficial hardening with application of induction heating and the operated surface hardening cooling is given. Experience of the Minsk automobile plant on introduction in manufacturing application of wheel gears of wheel gearing of MAZ trucks from steel 60PP is considered.

In this paper, a novel type auxiliary active resonant capacitor snubber assisted zero current soft switching pulse modulation single-ended push pull (SEPP) series load resonant inverter with two auxiliary resonant lossless inductor snubbers is proposed for consumer high-frequency induction heating (IH) appliances. Its operating principle in steady state is described by using each mode equivalent circuits. The new multi resonant high-frequency inverter can regulate its output power under a condition of a constant frequency zero current soft switching (ZCS) commutation principle on the basis of asymmetrical PWM control scheme. The consumer brand-new IH products using proposed ZCS-PWM series load resonant SEPP high-frequency inverter is evaluated and discussed as compared with conventional high-frequency inverter on the basis of experimental results. In order to extend ZCS operation ranges under a low power setting PWM, the pulse density modulation (PDM) strategy is demonstrated for high frequency multi resonant inverter. Its practical effectiveness is substantially proved from an application point of view

This paper presents a new prototype of a single-stage ac-ac converter with Silicon-Carbide (SiC)-MOSFET / SiC-SBD integrated power module for induction heating (IH) applications. Switching and conduction power losses are effectively reduced by virtue of the 1.2kV-120 A All-SiC power module under the condition of zero voltage soft-switching (ZVS), as compared to the counterpart solution using a Si-IGBT / Si-PNDiode power module. The performances of the new prototype are evaluated by experiment, thereby demonstrating the advantageous properties such as high-efficiency and low switching noise due to the wide band-gap power module.

A new prototype of a zero voltage soft-switching (ZVS) utility frequency ac to high-frequency ac resonant power converter for induction heating (IH) applications is presented in this paper. The series resonant ac-ac converter proposed herein can process the frequency conversion without any diode bridge rectifier, thereby reducing the relevant conduction power losses. In addition, power factor correction (PFC) can be naturally achieved by the inductor-based boost half-bridge circuit with the nonsmoothed dc-link. The operation principle together with an IH load power regulation scheme is described, and the converter performances including ZVS operations and PFC are demonstrated in an experiment with a 3.0-kW-30-kHz prototype by comparing it with the previously developed converter. Finally, the feasibility of the proposed ac-ac converter is evaluated from a practical point of view.

Induction heating technology plays a significant role in heating applications with its high efficiency, fast response, and precise control ability. Traditional resonant inverter-based systems face problems such as complexity, lack of flexibility, and low efficiency in multi-load situations. To overcome these issues, a new non-resonant full-bridge multiple-output inverter topology using silicon carbide (SiC) semiconductor devices is presented. While the system is simplified by eliminating resonant components, efficiency is increased thanks to SiC devices. In the study, a coil design methodology focusing on coil resistance and inductance is presented to optimize energy transfer and maximize system performance. Load-sensing and advanced frequency-modulation techniques are integrated to provide precise and independent power regulation in multi-loads. Thus, the efficiency of energy distribution and system robustness are increased. The proposed topology offers heating performance that provides homogeneous heat distribution. The developed prototype was proven to operate reliably with high efficiency under different load conditions and was suitably applied for domestic induction heating applications. An efficiency of 96.78% was achieved at a 50 kHz operating frequency and 2000 W power level.