Regenerable cement sorbent for recycle fluidized-bed combustion systems. Final report

Technical Report · Mon Apr 01 04:00:00 EST 1985

OSTI ID:5744206

Yoo, H J; Steinberg, M

Agglomerated cement sorbent pellets (ACS) were investigated as a regenerable sorbent for the purpose of removing SO/sub 2/ in a circulating fluidized-bed combustion (CFBC) system. The systems concept is to use an intermediate size sorbent pellet so that fine flyash can be separated from the sorbent at the top end of the CFBC and the coarse gangue can be separated from the sorbent remaining in the bottom end. In this study, basic experimental data were obtained on the sulfur capture capacity and regenerability of the ACS pellets as a function of the concentration of flyash mixed with the pellets and as a function of temperature. Thermogravimetric Analysis (TGA) was used for this purpose. A 40 mm bench-scale fluidized-bed unit operated with a simulated combustion gas mixture was used to determine the attrition resistance of the pellets. The results indicate that 30-100 mesh ACS pellets at 958/sup 0/C (1756/sup 0/F) maintain a 55-60% sulfation capacity mixed with coal flyash concentration up to 75% by weight. The sorbent pellets were 100% regenerable and did not lose reactivity in repeated cyclical sulfation and regeneration tests. At higher temperatures up to 1158/sup 0/C (2116/sup 0/F) reactivity towards SO/sub 2/ declines due to sintering of the flyash on the surface of the ACS pellets. Tests showed good attrition resistance with only 1% loss per cycle in cyclical operation. These initial basic results indicate that ACS pellets are potentially useful as a recoverable and regenerable high capacity SO/sub 2/ sorbent in a circulating fluidized-bed combustion system. 5 refs., 7 figs., 8 tabs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5744206
• Report Number(s): EPRI-CS-3968; ON: DE85011060
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
BUILDING MATERIALS
CARBONACEOUS MATERIALS
CEMENTS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
ELECTRON MICROSCOPY
ENERGY SOURCES
EXPERIMENTAL DATA
FABRICATION
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
INFORMATION
MATERIALS
MICROSCOPY
MOLDING
NUMERICAL DATA
OXIDATION
PELLETIZING
QUANTITATIVE CHEMICAL ANALYSIS
RECYCLING
REGENERATION
SCANNING ELECTRON MICROSCOPY
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES