Preignition volatile yield as related to coal characteristics. Quarterly report, October-December 1980

Technical Report · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6674460· OSTI ID:6674460

The computer model for the study of pulverized fuel processing is being modified to reflect the effect of variations in preignition volatile yields on the burning of coal in a conventional swirl burner. Two important criteria which define the performance of suspension burning of a solid fuel in a swirl burner are: (1) flame stability; and (2) combustion efficiency. Both of these parameters depend strongly on the ratio of kinetic or combustion time scales of the fuel to the residence time available in the vicinity of the recirculation zone of the swirl burner. Enhanced pyrolysis yield at high heating rate may function in three ways in boiler combustion: (1) enhanced mixture ignitability, resulting in a heat release closer to the input structure; (2) enhanced combustion rate, allowing easier overall stabilization of the flame; and (3) ehanced fuel burnout both in the vicinity of the recirculation stabilization region and downstream of it. The existing combustion model, previously developed at AERL, Inc., for general modeling of pulverized fuel processing, is being modified to investigate these effects in a semi-quantitative manner. The flow, mixing and radiative environment of a swirl are simulated, while the combustion history of the fuel is predicted as a function of such fuel-related parameters as size distribution, volatile yield and char reactivity. Ten different coals have been selected and the test reactor has been modified to improve operability and the precision of the results. (LTN)

• Research Organization: Avco-Everett Research Lab., Inc., Everett, MA (USA)
• DOE Contract Number: AC22-80PC30290
• OSTI ID: 6674460
• Report Number(s): DOE/PC/30290-T1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COMBUSTION
DECOMPOSITION
DEVOLATILIZATION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GEOLOGY
HEATING RATE
MATERIALS
MATHEMATICAL MODELS
MATTER
OXIDATION
PETROLOGY
PYROLYSIS
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
VOLATILE MATTER