Effect of attrition on particle size distribution and SO2 capture in fluidized bed combustion under high CO2 partial pressure conditions

Jaakko Saastamoinen (Corresponding Author), T. Shimizu, Antti Tourunen

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

In both pressurized and oxygen-enriched fluidized bed combustion the partial pressure of CO2 in the reactor becomes high, which affects SO2 capture by limestone. Both of these technologies are also applicable to decreasing greenhouse gas emissions; the first one by increasing the efficiency of electric energy production and the latter by enabling capture of carbon dioxide for storage. Attrition increases the reaction rate by removing the sulphated layer on the particle, thus reducing the diffusion resistance. In the well-known solution for the shrinking core model the reaction time can be presented as the sum of the contributions of the kinetics and diffusion. It is shown that the effect of attrition can be expressed as an auxiliary term in this expression. A method to extract the diffusivity of the product layer from the SO2 response in a bench-scale fluidized bed test using a limestone sample with a wide particle size distribution is presented. Based on a population balance model, a method to estimate the particle-size-dependent attrition rate from measured particle size distributions of the feed and bed material is illustrated for a 71-MWe pressurized power plant. In addition attrition and its effect on the optimization of the limestone particle size for sulphur capture in oxygen-enriched combustion are discussed.

Original languageEnglish
Pages (from-to)550-555
JournalChemical Engineering Science
Volume65
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed
Event20th International Symposium on Chemical Reaction Engineering, ISCRE 20: Green Chemical Reaction Engineering for a Sustainable Future—Beyond the Kyoto Protocol - Kyoto, Japan
Duration: 7 Sep 200810 Sep 2008

Keywords

  • Attrition
  • particle
  • population balance
  • reaction engineering
  • SO2 capture
  • fluidized beds

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