The effect of circulating fluidized bed particle characteristics on erosion of 1020 carbon steel

• Published in: Wear Vol. 188; no. 1; pp. 33 - 39
• Main Authors: Lindsley, B.A., Marder, A.R., Lewnard, J.J.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.09.1995; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Boilers; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Erosion; Exact sciences and technology; Fluidized bed circulation; Particle characterization; Particle impact; Particle shape; Particle shape; Particle impact; Fluidized bed circulation; Particle characterization; Erosion; Circulating fluidized bed; Particle size; Tube; Fluidized bed boiler; Carbon steel; Experimental study; Steady state
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/0043-1648(94)06588-8

A series of erosion tests were performed to determine the erosivity of several different circulating fluidized bed materials. The tests were conducted with 1020 steel as the target material at 400°C and particle velocities of 75 m s −1. The bed material erosivity was found by measuring the sample weight change with time and determining the steady-state erosion rate. It was found that for some conditions, the steel target showed a weight gain owing to soft constituents in the erodent forming a deposit of particle fragments on the surface. Two bed materials were then separated by particle size, ranging from less than 106 μm to greater than 1400 μm, and each size fraction was erosion tested. The shape of the particles was measured using a quantitative image analysis system and it was found that particle shape changed with the size fraction of the bed particles. Particle composition, which was also found to vary with particle size, was determined using elemental analysis. Based on these results, the erosion of 1020 boiler tube steel was correlated to the particle characteristics of size, shape, and composition.