Fundamental processes involved in SO/sub 2/ capture by calcium-based adsorbents
This paper discusses the fundamental processes in SO/sub 2/ capture by calcium-based adsorbents for upper furnace, duct, and electrostatic precipitator (ESP) reaction sites. It examines the reactions in light of controlling mechanisms, effect of sorbent physical properties, and important process variables. Upper furnace reactivity is limited to 900-1200 C by rate and equilibrium constraints, respectively. Sulfation is a function of in-situ sorbent characteristics of porosity, particle size, and surface area. Conversion of the sorbent is ultimately limited by the formation of the calcium sulfate (CaSO/sub 4/) product layer. The in-duct reaction is accomplished through sorbent scavenging in the flue-gas stream by a water spray. The scavenging efficiency of the sorbent by the water droplets limits the process, while reaction is controlled by the dissolution rate of the sorbent. The E-SOX process in a modified ESP simulates a short time spray dryer through injection of a Ca(OH)/sub 2/ slurry. The Ca(OH)/sub 2/ undergoes aqueous phase reaction to remove SO/sub 2/. Evaporation of the droplets prior to the ESP field conditions the flue gas for more-efficient particulate-matter collection by lowering the gas resistivity.
- Research Organization:
- Energy and Environmental Research Corp., Irvine, CA (USA)
- OSTI ID:
- 5790586
- Report Number(s):
- PB-88-102991/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM COMPOUNDS
ADSORBENTS
COAL
FLUE GAS
DESULFURIZATION
SULFUR DIOXIDE
ADSORPTION
ELECTROSTATIC PRECIPITATORS
FURNACES
NAPAP
POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
GASEOUS WASTES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
SORPTION
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management