Thermally induced structural changes in coal combustion

Technical Report · Wed Jan 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/5059851· OSTI ID:5059851

Flagan, R C; Gavalas, G R

The effects of the temperature-time history during coal devolitization and oxidation on the physical properties and the reactivity of resulting char were studied experimentally for temperatures and residence times typical of pulverized combustion. Experiments were also carried out at somewhat lower temperatures and correspondingly longer residence times. An electrically heated laminar flow reactor was used to generate char and measure the rates of oxidation at gas temperatures about 1600K. Partially oxidized chars were extracted and characterized by gas adsorption and mercury porosimetry, optical and scanning electron microscopy, and oxidation in a thermogravimetric analysis system (TGA). A different series of experiments was conducted using a quadrople electrodynamic balance. Single particles were suspended electrodynamically and heated by an infrared laser in an inert or oxygen-containing atmosphere. During the laser heating, measurements were taken of particle mass, size/shape, and temperature.

• Research Organization: California Institute of Technology (CalTech), Pasadena, CA (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-88PC88911
• OSTI ID: 5059851
• Report Number(s): DOE/PC/88911-T8; ON: DE92017807
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
CHEMICAL ANALYSIS
PHYSICAL PROPERTIES
COAL
DEVOLATILIZATION
OXIDATION
BALANCES
COMBUSTION
CONTROLLED ATMOSPHERES
LASERS
PARTICLE SIZE
POROSITY
PROGRESS REPORT
SCANNING ELECTRON MICROSCOPY
TEMPERATURE DEPENDENCE
THERMAL GRAVIMETRIC ANALYSIS
TIME DEPENDENCE
ATMOSPHERES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DOCUMENT TYPES
ELECTRON MICROSCOPY
ENERGY SOURCES
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
MATERIALS
MEASURING INSTRUMENTS
MICROSCOPY
PYROLYSIS PRODUCTS
QUANTITATIVE CHEMICAL ANALYSIS
SIZE
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
WEIGHT INDICATORS
014000* - Coal
Lignite
& Peat- Combustion
010409 - Coal
Lignite
& Peat- Pyrolysis & Carbonization- (1987-)