Effects of coal structure on pulverized coal conversion processes

Technical Report · Thu Nov 30 04:00:00 EST 1989

OSTI ID:6565762

Wells, W F; Smoot, L D

This document summarizes research accomplishments of a forty-seven month study of the effects of coal structure on pulverized coal conversion processes. The objective of this study was to determine the causal relations between the physical and chemical properties and high temperature reaction characteristics of three coals of different rank (North Dakota Beulah-Zap lignite, Wyoming Wyodak subbituminous, and Utah Schofield bituminous) and chars derived from these coals. Chars were prepared from two size-graded fractions of the parent coal. Fuels prepared were: (1) untreated coal (virgin coal), (2) char prepared by extraction in pyridine (extract char), and (3) char prepared by pyrolysis at high temperature in an inert atmosphere (pyrolysis char). Fifty different types of measurements were made to characterize the fuel chemical and physical properties. The virgin coals and prepared chars were reacted in air at three gas temperatures (1073, 1173, and 1273 K) and at three residence times (20, 25, and 30 ms). Advanced statistical correlative methods were used to analyze the fuel properties data and determine the statistical significance of the observed trends. Correlative analysis was performed to determine relationships among: (1) physical and chemical properties of the fuels, (2) physical and chemical properties of the virgin coals with those of the chars and char yield, and (3) physical and chemical properties of the fuels and their reaction rates. Comparison of the observed correlations with theory and the experimental work of others allowed the determination of several causal relations. 176 refs., 57 figs., 20 tabs.

• Research Organization: Brigham Young Univ., Provo, UT (USA). Combustion Lab.
• Sponsoring Organization: DOE/FE
• DOE Contract Number: FG22-85PC80529
• OSTI ID: 6565762
• Report Number(s): DOE/PC/80529-T14; ON: DE90016754
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010409 -- Coal
Lignite
& Peat-- Pyrolysis & Carbonization-- (1987-)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
014000 -- Coal
Lignite
& Peat-- Combustion
ACTIVATION ENERGY
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHARS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COAL RANK
COMBUSTION PROPERTIES
CORRELATIONS
DECOMPOSITION
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
LIGNITE
MATERIALS
MOLECULAR STRUCTURE
PARTICLE SIZE
POROSITY
PROGRESS REPORT
PYROLYSIS
PYROLYSIS PRODUCTS
REACTIVITY
SIZE
SUBBITUMINOUS COAL
SURFACE AREA
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES