Coal plasticity at high heating rates and temperatures

Technical Report · Mon Jan 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/7033643· OSTI ID:7033643

Darivakis, G S; Peters, W A; Howard, J B

The broad objective of this project is to obtain improved, quantitative understanding of the transient plasticity of bituminous coals under high heating rates and other reaction and pretreatment conditions of scientific and practical interest. To these ends the research plan is to measure the softening and resolidification behavior of two US bituminous coals with a rapid-heating, fast response, high-temperature coal plastometer, previously developed in this laboratory. Specific measurements planned for the project include determinations of apparent viscosity, softening temperature, plastic period, and resolidificationtime for molten coal: (1) as a function of independent variations in coal type, heating rate, final temperature, gaseous atmosphere (inert, 0{sub 2} or H{sub 2}), and shear rate; and (2) in exploratory runs where coal is pretreated (preoxidation, pyridine extraction, metaplast cracking agents), before heating. The intra-coal inventory and molecular weight distribution of pyridine extractables will also be measured using a rapid quenching, electrical screen heater coal pyrolysis reactor. The yield of extractables is representative of the intra-coal inventory of plasticing agent (metaplast) remaining after quenching. Coal plasticity kinetics will then be mathematically modeled from metaplast generation and depletion rates, via a correlation between the viscosity of a suspension and the concentration of deformable medium (here metaplast) in that suspension. Work during this reporting period has been concerned with re-commissioning the rapid heating rate plastometer apparatus.

• Research Organization: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89773
• OSTI ID: 7033643
• Report Number(s): DOE/PC/89773-T1; ON: DE92019523
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
PLASTICITY
MEASURING METHODS
BITUMINOUS COAL
COAL EXTRACTS
CONTROLLED ATMOSPHERES
HEATING RATE
PLANNING
PROGRESS REPORT
TEMPERATURE DEPENDENCE
ATMOSPHERES
BLACK COAL
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
MECHANICAL PROPERTIES
010409* - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)
010600 - Coal
Lignite
& Peat- Properties & Composition