The effects of cations on pulverized coal combustion

Conference · Mon Aug 01 04:00:00 EDT 1983 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:6726277

Morgan, B A; Scaroni, A W

Although coal has been burned for centuries, many fundamental aspects of the process remain poorly understood. Conflicting theories appear in the voluminous combustion literature. There is, however, general agreement that coal combustion occurs in two stages: pyrolysis or devolatilization of the coal followed by heterogeneous combustion of the char. In most practical combustors, the latter acts as the rate determining step for the overall process. For more efficient coal combustion, therefore, it is essential to understand the parameters which most affect the rate of heterogeneous char combustion. Char combustion rate depends primarily on the reactivity of the carbonaceous material to oxygen. This reactivity is controlled by several parameters such as gas diffusion rates to and from the reactive surface and catalysis of combustion by inorganic species present in the char. This research concentrates on the effect of various inorganic species on the rate of pulverized lignite combustion. Jenkins et al. have shown that the reactivity of coal chars is rank related. Chars from low rank coals such as lignites were found to be more reactive than chars produced from high rank bituminous coals. This has been attributed to the presence of inorganic constituents, in particular ion exchangeable cations, in low rank coals and their chars.

• Research Organization: Fuels and Combustion Laboratory The Pennsylvania State University, University Park, PA
• OSTI ID: 6726277
• Report Number(s): CONF-830814-
• Conference Information: Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 28:4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ACTIVATION ENERGY
ALKALI METALS
ALKALINE EARTH METALS
BROWN COAL
CALCIUM
CARBONACEOUS MATERIALS
CATIONS
CHARGED PARTICLES
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
COMMINUTION
ELEMENTS
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
ION EXCHANGE
IONS
KINETICS
LIGNITE
MATERIALS
METALS
OXIDATION
POTASSIUM
PYROLYSIS PRODUCTS
REACTION KINETICS
SODIUM
THERMOCHEMICAL PROCESSES