Combustion rates of coal-water slurry droplets

Conference · Thu Dec 31 04:00:00 EST 1992

OSTI ID:10178729

Levendis, Y A; Atal, A

This paper reports on experimental findings and theoretical calculations on the combustion rates of coal-water fuels. Combustion of coal-water fuels (CWF) takes place upon evaporation of the water and heat-up of the remaining solid agglomerate. Combustion takes place in two distinct phases: (i) burning of the volatiles in an envelope flame, and (b) burning of the char heterogeneously. Volatile combustion takes place at high temperature (2500--2800 K in air at gas temperatures of 1350--1450 K). The Chars ignite at temperatures in the vicinity of 1400--1500 K and burn a little above 2000 K in air. Swelling of the bituminous coals was observed during the devolatilization stage. Fragmentation at the end of the char combustion was occasionally observed. All experiments were conducted in a bench scale, high temperature furnace electrically heated to gas temperatures up to 1600 K. Single CWF droplets (100--600 {mu}m, in diameter) were generated inside the furnace, and upon ignition their combustion behavior was monitored with a specially developed three wavelength (640, 810 and 998 nm) pyrometer.

• Research Organization: Northeastern Univ., Boston, MA (United States). Dept. of Mechanical Engineering
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89776
• OSTI ID: 10178729
• Report Number(s): CONF-920424--1; ON: DE93017258
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000
CHARS
COAL
COMBUSTION
COMBUSTION KINETICS
DROPLETS
FUEL SLURRIES
PARTICLE SIZE
VOLATILE MATTER
WATER