Ash fouling of low-rank coals

Conference · Mon Jul 01 04:00:00 EDT 1985

OSTI ID:5505045

Jones, M L

Fouling behavior of lignite fuels was found to be dependent on silica, calcium and potassium levels as well as sodium/ash ratios. Differing fouling behavior in the case examined was not related to the mode of occurrence of the elements in question, but rather to the relative concentrations of the key elements (Na, K, Si, Ca) and total ash in coal. Metallic sodium appears to form during the early stages of combustion (devolatilization) of high sodium low-rank coals. Redeposition of vapor phase alkali on char particles appears to occur in the flame. The second goal of the work is a greater understanding of the mineral matter transformations that occur in low-rank coal combustion systems. This general goal ahs been pursued in laboratory scale studies to investigate the partitioning of alkali and sulfur species between the vapor and solid phase within a low-rank coal flame. The coals have been burned in a laminar flame located at Midwest Research Inc. (MRI). Analysis of the vapor and solid products were performed by MRI and UNDERC, respectively. This report discusses the results of analytical data obtained by UNDERC from the following techniques; electron spectroscopy for chemical analysis (ESCA), x-ray fluorescence (XRF), scanning electron microscopy (SEM) and molecular beam mass spectrometry (MBMS). The MBMS was used to determine the gas species present in the combustion products. SEM, XRF and ESCA were used to identify ash products. 4 figs., 3 tabs.

• Research Organization: North Dakota Univ., Grand Forks (USA). Energy Research Center
• DOE Contract Number: FC21-83FE60181
• OSTI ID: 5505045
• Report Number(s): DOE/FE/60181-163; CONF-850878-4; ON: DE85015764
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
ASHES
BEAMS
BOILERS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMBUSTION
DATA
DEPOSITS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
ENERGY SOURCES
EXPERIMENTAL DATA
FABRICATION
FOSSIL FUELS
FOULING
FUELS
HARDNESS
INFORMATION
LIGNITE
MASS SPECTROSCOPY
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MINERALS
MOLECULAR BEAMS
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDATION
PHASE TRANSFORMATIONS
RESIDUES
SCANNING ELECTRON MICROSCOPY
SINTERING
SPECTROSCOPY
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS