Advanced Powder Technology, Vol.31, No.2, 867-874, 2020
Segregation of char and silica sand particles in a hot-fluidized-bed steam gasifier
Understanding the behavior of coal char particles in a hot fluidized bed is essential for the design and operation of low-temperature gasifiers. The segregation of char as flotsam is the main focal point of this work. Segregation is generally unfavorable; however, it is attractive if the char holdup can act advantageously as a strong promoter of in-bed decomposition of tar and its conversion to syngas. This study first demonstrates the segregation of char during its gasification in a hot fluidized bed at a relatively low U-0/U-mf and at a steady state under continuous feeding and discharge of lignite and char, respectively. The distribution of char and its conversion from the bottom to the top of the bed are obtained from the motion of the char particles and the distribution of the gas components. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.