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Induction heating pyrolysis of landfilled plastic waste into valuable hydrocarbon fuels
(2025-03-01)
Phongsakun, Kittiphon
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Chaiyaraksa, Chompoonut
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Sricharoenchaikul, Viboon
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Kachapongkun, Pongsakorn
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Kaewpengkrow, Prangtip Rittichote
This research investigated the pyrolysis process for plastic waste treatment using induction heating. The induction system involved a coil wrapped around insulated material to generate heat. The plastic waste was sourced from the Refuse-Derived Fuel (RDF) sorting process from a 15-year-old landfill in the province of Nonthaburi, Thailand. The pyrolysis was performed at temperatures ranging from 400 to 600°C with a batch reactor. The highest yield of pyrolysis oil was 27.6% wt. at 600°C. Energy consumption for converting plastic waste into oil ranged between 9.50 and 13.36 kWh, with the highest consumption at 600 °C. The produced pyrolysis oil at 600°C achieved the highest HHV of 41.33 MJ/kg. The GC/MS analysis of the pyrolysis oil revealed an increase in aromatic and hydrocarbons (C5-C11 and C12-C20) with rising temperature. These carbon fractions are suitable replacements for heavy oil or diesel fuel, as low-oxygenated compounds, and hydrocarbon content in pyrolysis oil are desirable. The amount of char produced at 400°C was the highest, with a yield that ranged from 45.2% wt. to 67.0% wt. Moreover, the pyrolysis process has a significant advantage in lowering greenhouse gas emissions (0.21–0.25% vol.), which releases less CO2 than the combustion of plastic waste. The findings therefore suggest that pyrolysis oil, which is produced under optimum conditions, can be used as a substitute liquid fuel in the industrial sector, and is consistent with the circular economy's concepts, promoting sustainability and utilizing resource efficiency.
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A dual coil induction heating machine for jewelry factories developed by electromagnetic analysis
(2023-06-01)
Pattanapichai, Sorathorn
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Jansaengsuk, Thodsaphon
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Thongsri, Jatuporn
An induction heating machine (IHM) generates magnetic flux density (B) and high temperature for combining precious metals as products in a jewelry factory. Since factories require new generation IHMs for increased productivity and cost savings, a dual coil IHM development approach is presented here to replace conventional, single-coil IHM using electromagnetic analysis (EMA). First, the experiments and the EMA investigated B generated by a conventional one using the factory operating condition. Both agreed, confirming the methodology and reliability of the EMA, which was analyzed to determine B<inf>p</inf>. The B<inf>p</inf> represents a B property for the new dual coil IHM to be expected to generate a comparable signal to the single coil. Then, in development, two novel designs of dual coil IHM (series and parallel) were investigated based on current flow circuits. For these designs, B<inf>p</inf> was investigated using the EMA. As expected, the EMA results showed that both coils generated a different B<inf>p</inf>, which was unfortunately incompatible with the conventional IHM and thus was inappropriate in actual use. However, the series dual coil showed better applicability since it generated B higher than the parallel coil under the same operating conditions. Next, the EMA was applied to determine the B<inf>p</inf> of the series dual coil by varying the applied current (I), frequency (f), number of coil turns (N), and distance between coils (d). Finally, the EMA results revealed two options of the series dual coil with the optimum I, f, N, and d generating B<inf>p</inf> comparable to the conventional IHM, as intended, achieving the factory's need with two times the productivity.
1
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Analysis of two continuous control regions of conventional phase shift and transition phase shift for induction heating inverter under ZVS and NON-ZVS operation
(2008-12-04)
Viriya, Pichetjamreon
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Yongyuth, Naras
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Matsuse, Kouki
This paper proposes an analysis of two continuous control regions of conventional phase shift and transition phase shift for a full-bridge series resonant inverter operating under zero voltage switching (ZVS) and nonzero voltage switching (NON-ZVS) conditions with the load of induction heating. A number of circuit operations for the cases of conventional phase-shift and transition phase-shift control regions under ZVS and NON-ZVS conditions are analyzed first. Various voltage and current equations of the operating circuits are then obtained and used for calculation of the waveforms with the aid of the MATLAB program. The calculated waveforms make possible the consideration of some important circuit parameters that are used to determine ZVS or NON-ZVS conditions. The theoretical results and the proposed method are also verified by experiments, using a prototype test set in our laboratory. © 2008 IEEE.
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Analysis of transition mode from phase-shift to zero phase-shift under ZVS and NON-ZVS operation for induction heating inverter
(2008-01-01)
Viriya, Pichetjamroen
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Yongyuth, Naras
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MatSUSe, Kouki
This paper proposes an analysis of transition mode from phase-shift to zero phase-shift under ZVS and NON-ZVS operations for a series resonant inverter with the load of induction heating. A number of circuit operations during transition mode from phase-shift to zero phase-shift under ZVS and NON-ZVS conditions are first analyzed. Various voltage and current equations of the operating circuits are then obtained and used for calculation of the waveforms by the aid of MATLAB program. The calculated waveforms make possible the consideration of some important circuit parameters that are used to determine ZVS or NON-ZVS conditions. The theoretical results and proposed method are also verified by experimental ones, using a prototype test set in our laboratory. © 2008 The Institute of Electrical Engineers of Japan.
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Analysis of three-level ZVS PWM inverter for induction heating applications
(2007-12-01)
Jangwanitler, A.
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Songboonkaew, J.
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Thammasiriroj, W.
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Balda, J. C.
This paper presents an operation analysis of a high frequency three-level (TL) PWM inverter applied for an induction heating applications. The feature of TL inverter is to achieve zero-voltage switching (ZVS) at above the resonant frequency. The circuit has been modified from the full-bridge inverter to reach high-voltage with low-harmonic output. The device voltage stresses are controlled in a half of the dc input voltage. The prototype operated between 70 and 78 kHz at the dc voltage rating of 580 V can supply the output power rating up to 3000 W. The iron has been heated and hardened at the temperature up to 800°C. In addition, the experiments have been successfully tested and compared with the simulations. ©2006 IEEE.
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Analysis of a full-bridge inverter for induction heating using asymmetrical phase-shift control under ZVS and NON-ZVS operation
(2007-12-01)
Yongyuth, N.
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Viriya, P.
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Matsuse, K.
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS switching conditions in a high-frequency full-bridge inverter for induction heating, using the principle of asymmetrical phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power P<inf>o</inf>, dc input power P<inf>d</inf>, and hence the conversion efficiency η of the full-bridge inverter. The analysis results shows that the control ranges of ac output power P<inf>o</inf> and dc input power P<inf>d</inf> are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency f<inf>s</inf>. © 2007 IEEE.
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Analysis of transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS operation for induction heating inverter
(2007-10-01)
Viriya, P.
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Yongyuth, N.
;
Matsuse, K.
This paper proposes an analysis of transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS operation for a series resonant inverter with the load of induction heating. A number of circuit operation during transition mode from phase shift to zero-phase shift under ZVS and NON-ZVS conditions are first analyzed. Various voltage and current equations of the operating circuits are then obtained and used for calculation of the waveforms by the aid of MATLAB program. The calculated waveforms make possible the consideration of some important circuit parameters that are used to determine ZVS or NON-ZVS conditions. The theoretical results and proposed method are also verified by experimental ones, using a prototype test set in our laboratory. © 2007 IEEE.
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Analysis of circuit operation under ZVS and NON-ZVS conditions in phase-shift inverter for induction heating
(2006-01-01)
Viriya, Pichetjamroen
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Yongyuth, Naras
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Miki, Ichiro
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Matsuse, Kouki
This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS conditions in a full-bridge high-frequency phase-shift control series resonant MOSFET inverter with the load of induction heating. Various modes of circuit operation both under ZVS and NON-ZVS conditions are first analyzed in details. The voltage and current equations of these circuits are then obtained and used for calculation of the waveforms by MATLAB program. The calculated results can lead to the consideration of various circuit parameters that determine ZVS or NON-ZVS operating conditions. The theoretical results are also verified by experimental ones, using a prototype test set rated at 3 kW.

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