Enhanced activity of so2 absorbent under high CO2 partial pressure in pressurized fluidized bed combustor

Yasuo Yoshii, Tetuya Iwase, Yozo Korai

Research output: Contribution to journalArticlepeer-review

Abstract

Emissions of SOx from a 4MWth twin-bed pressurized fluidized bed combustor (PFBC) system were measured during long-term (1187 hours) operation. The PFBC consisted of two bubbling beds, A-bed and Bbed. Though both reactors were operated at the same pressure and temperature, emissions of SO2 differed between two reactors. The limestone particles sampled from B-bed, which showed lower emission level, had more internal cracks and their particle size was smaller than those from A-bed. Basic studies of SO2 capture and calcination were also conducted using a pressurized fixed bed reactor for eight kinds of limestone. Calcination of limestone was found to increase reactivity with SO2 under elevated CO2 partial pressure conditions higher than equilibrium partial pressure. Limestones with more internal cracks were found to have higher reactivity towards SO2 absorption. The degree of crystallization measured by X-ray diffraction gave valuable information to predict reactivity and fragmentation. The difference in emission behavior between two fluidized beds is discussed in terms of crack formation and fragmentation.

Original languageEnglish
Pages (from-to)665-671
Number of pages7
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Volume89
Issue number7
DOIs
Publication statusPublished - Jul 20 2010

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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