Fundamental study of ash formation and deposition: Effect of reducing stoichiometry. Quarterly report No. 7, October 1, 1994--December 31, 1994
- ed.
The technical objectives of this project are: (a) To identify the partitioning of inorganic coal constituents among vapor, submicron fume, and fly ash products generated during the combustion of pulverized coal under a variety of combustion conditions. Fuel lean and fuel rich combustion conditions will be considered. (b) To identify and quantify the fundamental processes by which the transformations of minerals and organically-associated inorganic species occur. Emphasis will be placed on identifying any changes that occur as a result of combustion under sub-stoichiometric combustion conditions. (c) To incorporate the effects of combustion stoichiometry into an Engineering Model for Ash Formation based upon the understanding developed in (a) and (b). When completed, this model will predict the particle size and chemical composition distributions of ash formed during the combustion of pulverized coal under a broad range of conditions. The work discussed in this report highlights the accomplishments of the seventh quarter of this two year project. This includes University of Arizona efforts to minimize periodicity in the coal feeder for the drop tube furnace, and MIT efforts to calculate the concentrations of CO, CO{sub 2}, and O{sub 2} surrounding a burning char particle. In Section 3, the use of a pulsed gas flow to maintain a smooth coal feed to the drop tube furnace is discussed. Addition of pulsing action, driven by a peristaltic pump, has eliminated the coal feeder pluggage problems that had been occurring. In Section 4, the development of a single particle char combustion model by MIT is discussed. The model is then used for calculating oxygen, CO, and CO{sub 2} concentrations on the char particle surface as a function of char particle diameter. This information can then be used to interpret results of ash formation experiments conducted as a function of particle size and combustion stoichiometric ratio.
- Research Organization:
- Physical Sciences, Inc., Andover, MA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-93PC92190
- OSTI ID:
- 50958
- Report Number(s):
- DOE/PC/92190-T7; PSI-1178-(2/95); ON: DE95009362; TRN: 95:003909
- Resource Relation:
- Other Information: PBD: Feb 1995
- Country of Publication:
- United States
- Language:
- English
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