Char particle fragmentation and its effect on unburned carbon during pulverized coal combustion. Quarterly report, April 1, 1993--June 30, 1993
During this quarter, activities were undertaken primarily in Tasks 1 and 2: synthetic chars were produced and characterized, the solids-sampling probe was fabricated and tested, and chars were pyrolyzed in the pressurized thermogravimetric analyzer (PTGA). During the PTGA tests, problems associated with aligning the balance pan were resolved as well as were problems associated with overshooting the target temperature during the temperature ramping. The PTGA is now ready for use in pyrolysis and combustion tests. Synthetic chars prepared with 50%, 60% and 67% weight percent lycopodium were produced and characterized. Apparent density measurements indicate that the porosities of the chars are 0.47, 0.57, and 0.60, respectively. Presently, synthetic chars having porosities in the range 17% to 60% are available for experiments. The pressurized thermogravimetric analyzer (PTGA) was modified to allow gas blending and switching. With this modification, char particles can be heated in an inert environment to a temperature of interest before switching to an oxidizing environment. In several tests, particles of varying porosity were heated to 1000 {degree}C in a nitrogen environment and then combusted in an atmospheric environment containing 10% oxygen in nitrogen. During the heating period, particles were observed to lose about 10% of their weight. This weight loss is associated with the release of volatiles, the hydrogen and oxygen remaining in the synthetic char after curing at 550{degree}C for one hour. The PTGA results indicate that heating the one-hour cured char in a nitrogen environment at a rate of 10{degree}C/min to 1000{degree}C is sufficient to remove the volatiles.
- Research Organization:
- Stanford Univ., CA (United States). High Temperature Gasdynamics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-92PC92528
- OSTI ID:
- 10180878
- Report Number(s):
- DOE/PC/92528--3; ON: DE93041283
- Country of Publication:
- United States
- Language:
- English
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