Wide equivalence ratio operation of coal fired cyclone combustors: numerical and experimental results

Conference · Tue Nov 01 04:00:00 EST 1983 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:6941499

George, P E; Barnhart, J S; Laurendeau, N M

A continuous stirred tank reactor (CSTR) model has been developed for application to coal combustors and gasifiers. Allowed fuels include coal, char and prevaporized hydrocarbons or any combination thereof. Four classes of reaction are modeled: (1) coal pyrolysis using two competing reactions and a suitable approximation for volatiles composition; (2) char oxidation by O/sub 2/, H/sub 2/O, and CO/sub 2/ using the shrinking core model; (3) hydrocarbon oxidation using a quasi-global mechanism, and (4) elementary reactions mechanisms for the oxidation of CH/sub 4/, H/sub 2/ and CO. A comparison between model predictions and experimental data for a pulverized coal fired experimental cyclone reactor for equivalence ratios ((F/A)/(F/A)stoi) between 0.8 and 2.4 is presented. Agreement is excellent. Operation of the experimental reactor as a gasifier using only air and coal produced a maximum heating value of 3.0 X 10/sup 6/J/m/sup 3/ (80 Btu/scf) and a carbon utilization efficiency of 75%. Heat loss due to the small scale of the experiment is a significant factor in reducing gasification performance. Model predictions suggest heating values in excess of 4.0 X 10/sup 6/J/m/sup 3/ (120 Btu/scf) and 85% carbon utilization are possible with reduced heat loss.

• Research Organization: Univ. of Tennessee, Knoxville, TN
• OSTI ID: 6941499
• Report Number(s): CONF-831111-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 83-WA/FU-3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COMBUSTION CONTROL
COMBUSTORS
CONTROL
CYCLONE COMBUSTORS
DECOMPOSITION
ENERGY LOSSES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HEAT LOSSES
KINETICS
LOSSES
MATERIALS
MATHEMATICAL MODELS
PARTICLE SIZE
PERFORMANCE TESTING
PYROLYSIS
REACTION KINETICS
SIZE
TESTING
THERMOCHEMICAL PROCESSES