Calcium silicate cements for desulfurization of combustion gases. Semiannual progress report, October 1, 1980-March 31, 1981

Technical Report · Mon Jun 01 04:00:00 EDT 1981

OSTI ID:6106534

Yoo, H J; McGauley, P J; Steinberg, M

Commercial calcium silicate bearing Portland Cement Type II (PC III) has been identified as a promising regenerative sorbent for the removal of sulfur in the fluidized-bed combustion (FBC) of coal. The PC III is agglomerated in a drum pelletizer by low energy, low cost agglomeration techniques and cured to form pellets in the size range suitable for operating FBC units. The two-hour sulfation capacity is about 40% or better at 958/sup 0/C and does not deteriorate with cyclic use. The degree of regeneration is almost complete (above 95%) during cyclic use except for the first cycle. The rate of sulfation increases with the sulfation temperature, reaches its maximum at about 950 to 1000/sup 0/C, and then starts to decrease with further temperature increase. The rate of regeneration also increases with the regeneration temperature. The sorbent is effective up to a temperature of over 1000/sup 0/C. A small 40 mm I.D. bench scale fluid bed reactor has been used to determine the sulfur removal efficiency of the PC III pellet as well as the concentration of the regenerated SO/sub 2/, using propane gas as a fuel and a reducing agent. No SO/sub 2/ is detected in the flue gas stream until the PC III pellet is saturated to 75% of its capacity. The concentration of regenerated SO/sub 2/ increases with the feed rate of reducing gas and it reaches as high as 24% as the propane flow rate is increased to 160% excess. The attrition loss of the PC III pellet is about 3 to 4% per cycle during cyclic use. Bench scale testing of PC III sorbent in a coal fired 6-in. fluidized bed combustor at the Morgantown Energy Technology Center has indicated acceptable performance. An improved process and engineering design utilizing the PC III pellets in a coal fired power plant has indicated improved economy in comparison with once through limestone desulfurization.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6106534
• Report Number(s): BNL-51430; ON: DE82003245
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
010800 -- Coal
Lignite
& Peat-- Waste Management
014000* -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM SILICATES
CARBONACEOUS MATERIALS
CEMENTS
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
DESULFURIZATION
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
NONMETALS
NUMERICAL DATA
OXIDATION
OXYGEN COMPOUNDS
PORTLAND CEMENT
REGENERATION
REMOVAL
RESEARCH PROGRAMS
SILICATES
SILICON COMPOUNDS
SORPTIVE PROPERTIES
SULFUR
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES