Extent of sorbent utilization in dry scrubbing of acid gases
- Univ. of Surrey, Guildford (United Kingdom). Dept. of Chemical and Process Engineering
A ``crystallization and fracture`` model is presented to describe the mechanism of formation of product layers in gas-solid reactions. The model demonstrates the existence of a maximum thickness of product layer (PL) and the dependence of the chemical potential of a reaction on mechanical work. It is proposed that the structure of a PL is characterized by the initial critical radius (r{sub ki}) of the nuclei. The larger the value of r{sub ki}, the more porous is the PL, presenting a smaller resistance to gas diffusion and mechanical fracture of the PL. Experimental data are interpreted successfully for reactions of Na-sorbents with HCl by proposing that NAOH is formed as an intermediate product. The difference between the behavior of Na-sorbents and that of Ca-sorbents is explained.
- OSTI ID:
- 51901
- Report Number(s):
- CONF-940930--
- Country of Publication:
- United States
- Language:
- English
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