CaO interactionsin the staged combustion of coal. Fourth quarterly technical progress report, July 1, 1981-September 30, 1981

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6096775

Levy, A; Merryman, E L

The experimental work on the reaction of sulfur-bearing compounds with CaO to form CaS, was completed and work on a study of kinetic and chemical parameters governing CaS and CaSO/sub 4/ formation in staged combustion, was initiated. The reaction of pyrite with CaO in the absence of oxygen produced CaS in increasing amounts as the temperature was raised to at least 1100 C, reaching a maximum 50 percent conversion at 1100 C after several seconds reaction time. The rate of CaS formation decreased significantly with time at this temperature. An unidentified compound also formed at the higher temperatures and longer reaction times which appeared to contain significant amounts of calcium and iron. At short reaction times, much of the sulfur appeared to be tied up as pyrrhotites and unreacted FeS/sub 2/ with some CaS and possibly CaSO/sub 4/ present also. Hydrogen sulfide reacts faster with CaO than does carbonyl sulfide. The latter appeared to decompose significantly to elemental sulfur at relatively low temperatures. As with the FeS/sub 2/, the overall reaction of the H/sub 2/S and COS with CaO is rather slow in the absence of oxygen. In the study of CaS formation from combustion of pulverized coal in a methane flame, preliminary results indicate about 85 percent of the sulfur was retained in a fuel-rich flame at Q = 1.83, and at a Ca/S mole ratio of 3.8. By comparison an untreated raw coal retained 37 percent of the sulfur at Q = 2.09. The low oxygen content of the binary fuel flame resulted in low carbon burnout and of course high CO levels.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 6096775
• Report Number(s): DOE/PC/30301-4; ON: DE82003273
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFATES
CALCIUM SULFIDES
CARBON COMPOUNDS
CARBON OXYSULFIDE
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
ENERGY SOURCES
FOSSIL FUELS
FUEL ADDITIVES
FUELS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
ORES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PYRITE
PYRITES
SULFATES
SULFIDES
SULFUR COMPOUNDS
SULFUR ORES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS