The attrition behavior of sorbents in fluidized bed combustion: Effect of grain structure and physical strength
- Pennsylvania State Univ., University Park, PA (United States)
In fluidized bed power plants, limestones and dolostones are used as sorbents to capture sulfur dioxide released from burning coal. The attrition behavior of the sorbent used is an important operating consideration, because attrition changes the particle size distribution, which can influence sorbent utilization, heat transfer and the operating stability of the system. As previous studies have indicated, there are two size reduction pathways for a particle in a fluidized bed. The first involves surface abrasion producing one slightly smaller particle and many fine particles. The second involves break up of the initial particle, followed by surface abrasion of the resulting fragments. The fate of a particular sorbent particle depends on two competing parameters: breaking forces and material strength. Natural calcium-based sorbent particles are aggregates of individual grains of carbonate crystallites. Sorbents vary greatly in their physical structure and chemical composition. The work presented here is a study of the effect of sorbent physical properties, i.e., grain structure and physical strength, on attrition behavior.
- OSTI ID:
- 504595
- Report Number(s):
- CONF-960954--
- Country of Publication:
- United States
- Language:
- English
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