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Laboratory determination of factors affecting storage of North Dakota lignite: computer simulation of spontaneous heating.

Authors
Sondreal-EA; Ellman-RC
Source
Grand Forks, ND: U.S. Department of the Interior, Bureau of Mines, RI 7887, 1974 Apr; :1-83
Link
NIOSHTIC No.
10009245
Abstract
Material and energy balances for stockpiled lignite were calculated by computer simulation techniques to determine the occurrence of spontaneous heating. Data on properties of lignite which affect spontaneous heating were required. In some cases, best values from reported data were utilized; in other cases, new data were developed. These include specific studies on the rate and conditions that influence oxidation, heat of oxidation, heat of wetting, specific heat, thermal conductivity, and permeability of stockpiles to air. These data are presented and discussed in detail for possible application to other studies. Results of computer simulations confirm past field experience on the storage of lignite containing as-mined moisture, and predict a greater risk of heat occurrence in stockpiles of dried lignite where experience is lacking. Successful storage was predicted for dried lignite of 20 pct moisture content, if it were cooled after drying and compacted to an interparticle void fraction of 9 pct (bulk density of 67 lb/cu ft) compared to 10 pct void fraction (72 lb/cu ft) for as-mined lignite.
Publication Date
19740401
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-231987
NTIS Price
A06
Identifying No.
RI-7887
NIOSH Division
GFER
Source Name
Grand Forks, ND: U.S. Department of the Interior, Bureau of Mines, RI 7887
State
ND
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