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 language | English |
|---|---|
| Pages (from-to) | 1535-1547 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 47 |
| Issue number | 6-7 |
| DOIs | |
| Publication status | Published - 2004 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- heat exchangers
- heat flows
- heat flux
- heat transfer
- preheat
- fluidized beds