Heat exchange between two coupled moving beds by fluid flow

Jaakko Saastamoinen

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

Heat exchange between a moving bed and fluid flow is considered. The arrangement of flows of fluid and solids can be in parallel flow, counter-flow or cross-flow. The effect of possible phase change is considered using a simplified model. Heat exchange by forced fluid flow between two coupled moving beds containing solids can be used to recover heat from hot products to cool input in many industrial processes. There are several ways to couple such two moving beds. Analytical solutions for the fluid and solid temperature distributions and heat recovery effectiveness are presented for continuous operation for single moving beds and two beds coupled by a fluid flow. The intra-particle transient temperature distributions are accounted for in the more accurate analysis and the results are compared to lumped analysis and an approximate solution. The heat recovery effectiveness of a coupled system reaches maximum at certain optimum flow rate of the fluid. Analogy between regenerators and heat recovery systems consisting of two moving beds coupled by an unmixed flow of fluid is found. Due to this analogy many different calculation methods, tables and formulas developed for to evaluate temperatures and thermal effectiveness of regenerators can be used to study heat recovery from solids.
Original languageEnglish
Pages (from-to)1535-1547
JournalInternational Journal of Heat and Mass Transfer
Volume47
Issue number6-7
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • heat exchangers
  • heat flows
  • heat flux
  • heat transfer
  • preheat
  • fluidized beds

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