Effects of preignition on pulverized coal combustion. Sixth quarterly report, 1 January 1982-31 March 1982

Technical Report · Fri Jan 01 00:00:00 EST 1982

OSTI ID:5314840

Simons, G A; Kothandaraman, G; Schertzer, S P; Palm, M J

Task 1, pore structure optimization, is complete as reported in Section 2. The results of Task 1 predict that high reactivity chars require high porosities and a higher concentration of large pores. The experimental studies of Task 2 illustrate the dependence of these quantities on heating rate and final temperature. The data obtained for Texas Lignite suggest that porosity (hence reactivity) is strongly dependent on the final pyrolysis temperature with the maximum porosity occurring at 1300 K. The data also indicate that to a lesser extent, the heating rate affects pore structure. Higher heating rates increase the relative number of large pores and thus can enhance reactivity by a factor of two. Hence, the optimum pore structure for char reactivity may be obtained by preparing char at 1300 K and high heating rates (> 1000 K/s). Such chars could be four times as reactive as chars prepared at 2000 K and 1 to 10 K/s. The theory of pore evolution was completed last quarter. Potential mechanisms of pore evolution have been identified and described. For the most part, all mechanisms lead to the preservtion of the 1/r/sub p//sup 3/ distribution. This is the statistically derived pore distribution function which originally lead to the pore tree.

• Research Organization: Physical Sciences, Inc., Woburn, MA (USA)
• DOE Contract Number: AC22-80PC30293
• OSTI ID: 5314840
• Report Number(s): DOE/PC/30293-6; PSI-TR-322; ON: DE82013956
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHARS
CHEMICAL REACTION KINETICS
HEAT TREATMENTS
MICROSTRUCTURE
COAL
COMBUSTION
COAL FINES
POROSITY
PYROLYSIS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
MATERIALS
OXIDATION
PYROLYSIS PRODUCTS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion