CaO interaction in the staged combustion of coal

Technical Report · Mon Dec 19 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5322206· OSTI ID:5322206

Levy, A.; Merryman, E. L.; Rising, B. W.

The LIMB (limestone injection multi-stage burner) process offers special potential for reducing NO/sub x/ and SO/sub x/ by at least 50 percent in coal combustion. This is to be accomplished by adding limestone with fuel and/or air in a low NO/sub x/ burner. This program has been directed to defining the chemistry and kinetics necessary to optimize sulfur capture in LIMB combustion. More specifically, this program has attempted to clarify the role of calcium sulfide in LIMB chemistry. When limestone is added in a staged burner, there is a strong possibility that under certain circumstances CaS is produced in the reducing (fuel-rich) zone of the burner. Since CaS is more stable than CaSO/sub 4/, this affords the opportunity to (1) operate the burner at a higher temperature, 2200 to 2500 F, (2) pass the CaS rapidly through the high temperature zone (before dissociation), and (3) complete the combustion in a lean (air-rich) region where the sulfur is finally retained in CaSO/sub 4/. For these reasons this program has concentrated on the high temperature chemistry and kinetics of CaS. To achieve the program objective, the program was divided into three tasks. These involved (1) a study of CaS formation, (2) a brief examination of CaS oxidation, and (3) a laboratory examination of the combustion of coal in the presence of CaO under first stage, fuel-rich conditions. In the most general sense, the study has shown that the formation of CaS in the reducing zones of the burner may be restricted by competing kinetics and thermodynamics. The addition of lime in LIMB will require special care to optimize the ability to capture sulfur. 36 references, 44 figures, 10 tables.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 5322206
• Report Number(s): DOE/PC/30301-11; ON: DE84007869
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
014000* -- Coal
Lignite
& Peat-- Combustion
ADDITIVES
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
BURNERS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SULFIDES
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
DATA
DENITRIFICATION
DESULFURIZATION
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUEL ADDITIVES
FUELS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
LIMESTONE
MATERIALS
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYRITE
ROCKS
SEDIMENTARY ROCKS
STAGED COMBUSTION
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YIELDS