Calcium silicate cements for desulfurization of combustion gases. Final report, October 1, 1980-March 31, 1982

Technical Report · Tue Jun 01 04:00:00 EDT 1982

OSTI ID:6139992

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

Commercial calcium silicate bearing Portland Cement Type III (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 a low energy, low cost agglomeration technique and cured to form pellets in the size range suitable for operating FBC units. These agglomerated cement sorbent (ACS) pellets are hard, spherical in shape, become highly porous upon drying, and can be directly used in the FBC. The chemical/physical properties of ACS pellets prepared were determined by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), mercury porosimetry and BET surface area analysis. TGA measurements show that the 2-hour sulfation capacity of the ACS pellet is about 50% (based on available CaO content) 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. The rate of sulfation is found to be a strong function of reaction temperature, sulfur loading of the pellet, pellet size and SO/sub 2/ concentration of feed gas stream. A small 40 mm I.D. bench scale fluid bed reactor was used to determine the sulfur removal efficiency of the ACS 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/ was detected in the flue gas stream until the ACS pellet is saturated to 75% of its capacity. An engineering design and economic evaluation are developed using ACS pellets in the regenerative desulfurization process applied to industrial steam generators. This study consisted of an investigation of the operating economy and the cost of steam production when sorbents from different sources are used in a 200,000 lb/hr steam generating plant.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6139992
• Report Number(s): DOE/METC-83-44; ON: DE83008767
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
BOILERS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM SILICATES
CARBONACEOUS MATERIALS
CEMENTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
CONTROL
DESIGN
DESULFURIZATION
ECONOMIC ANALYSIS
ECONOMICS
ENERGY SOURCES
EQUIPMENT
FABRICATION
FLUE GAS
FLUIDIZED BED BOILERS
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
GASEOUS WASTES
MATERIALS
MOLDING
OXIDES
OXYGEN COMPOUNDS
PELLETIZING
PELLETS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PORTLAND CEMENT
POWER PLANTS
SILICATES
SILICON COMPOUNDS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES