Model for flue-gas desulfurization in a circulating dry scrubber
- Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
A simple model was developed to describe the absorption of SO{sub 2} in a circulating dry scrubbing (CDS) process, which is a semi dry, lime-based, flue-gas desulfurization (FGD) process that utilizes a circulating fluidized bed arrangement for contacting a sorbent with SO{sub 2}-laden flue gas under coolside conditions. The reaction chemistry is thought to be similar to that of spray-drying absorption. The liquid-phase mass-transfer coefficient was successfully modeled as a function of the sorbent particle spacing on the wetted surfaces. Gas-phase mass-transfer resistances were assumed to be insignificant. Due to the high surface area available in a CDS reactor, the evaporation rate of water from the slurry was modeled as constant-rate drying according to classic spray-dryer theory. However, the falling-rate and diffusion evaporation stages were negligible in CDS since sorbent particle bunching at the surface of the slurry is nonexistent.
- OSTI ID:
- 201439
- Journal Information:
- AIChE Journal, Journal Name: AIChE Journal Journal Issue: 1 Vol. 42; ISSN 0001-1541; ISSN AICEAC
- Country of Publication:
- United States
- Language:
- English
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