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A pulse-width modulation controlled wire-mesh heater apparatus for investigation of solid fuel pyrolysis

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2 Author(s)
Wagner, David Ray ; Department of Chemical Engineering, Institute for Clean & Secure Energy, University of Utah, Salt Lake City, Utah 84112, USA ; Whitty, Kevin J.

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A novel wire mesh heater apparatus has been developed to study the devolatilization of solid fuels under pressurized conditions at well-controlled heating rates on the order of 1000 K/s. The apparatus combines direct current and pulse-width modulation with a fast-acting and high current-capacity relay to achieve operating frequencies up to 2000 Hz. This frequency allows much quicker feedback and tighter control of temperature than conventional ac-based systems that operate at 50 to 60 Hz. The present apparatus has been successfully operated at 63 bars with final temperatures of 1473 K and heating rates of 1100 K/s.

Published in:

Review of Scientific Instruments  (Volume:83 ,  Issue: 11 )