Further studies of the combustion of pulverized char and low-volatile coal. [7 refs]

Conference · Mon Jan 01 04:00:00 EST 1973

OSTI ID:7308186

Demeter, J J; McCann, C R; Bienstock, D

Pulverized char was fired in a dry-bottom, front-wall-fired furnace, capable of burning about 500 lb of the material per hour. Earlier experiments with chars injected at ambient temperatures into this furnace had indicated that increasing amounts of supplementary fuel (natural gas) were required to maintain good combustion as the volatile matter of the char decreased with standardized conditions of burning rate, excess air, and primary air to fuel ratio. In the present investigation, the char-primary air mixture was preheated to eliminate the need for a dual fuel system. Effects of operating parameters such as secondary air preheat and fuel particle size were studied. A low volatile (5 percent) char was burned successfully without supplemental fuel at a char preheat temperature of 450-500/sup 0/F and a secondary air temperature of 600/sup 0/F. A char preheat temperature of 550/sup 0/F was required to obtain stable combustion without auxiliary fuel when the secondary air temperature was lowered to 500/sup 0/F. Low-volatile (18 percent) Pocahontas coal could be burned in the experimental combustor without either auxiliary fuel or preheat of the coal, thus giving an indication of the order of difficulty in burning low-volatile char.

• OSTI ID: 7308186
• Report Number(s): CONF-731105-12
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHARS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COAL FINES
COMBUSTION
DIAGRAMS
ENERGY SOURCES
FLOWSHEETS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
FURNACES
GAS FUELS
GASES
HIGH TEMPERATURE
NATURAL GAS
OPERATION
OXIDATION
PARTICLE SIZE
SIZE
THERMOCHEMICAL PROCESSES
VOLATILE MATTER