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Bench-scale carbonization of lignite from the Northern Great Plains Province: a statistical approach.

Authors
Boteler-DC; Kube-WR; Boley-CC
Source
Grand Forks, ND: U.S. Department of the Interior, Bureau of Mines, RI 7386, 1970 Jun; :1-32
Link
NIOSHTIC No.
10009030
Abstract
Five lignites from the northern great plains province were carbonized at temperatures from 500 deg. to 1,000 deg. C in a bench- scale unit. A replicated greco-latin square experimental design was employed to allow testing of four independent variables at five levels. Independent variables investigated were temperature, source of lignite (mine), weight of charge, and moisture content of charge. Dependent variables were char yield, tar yield, light-oil yield, tar plus light-oil yeild, carbonization gas yield, and carbonization gas heat yield. An analysis of variance indicated that, at the 99- percent confidence level, the independent variables of carbonization temperature, source of lignite, and weight of charge were significant for yields of char, tar plus light oil, and carbonization gas, whereas moisture content was only significant for carbonization gas yields. At the 95-percent confidence level, moisture content significantly influenced the carbonization gas heat yield per pound of lignite charge and the yields of dry tar plus light oil. All dependent variables were determined on a moisture- and ash-free basis. Multiple regression equations for predicting seven different factors of carbonization yields as functions of carbonization temperature and initial composition were developed using computer techniques. Equations for yields of char, tar plus light oil, and carbonization gas were compared with equations previously developed by others at the 500 deg. C level.
Publication Date
19700101
Document Type
IH; Report of Investigations
Fiscal Year
1970
NTIS Accession No.
PB-192306
NTIS Price
A04
Identifying No.
RI-7386
NIOSH Division
GFER
Source Name
Grand Forks, ND: U.S. Department of the Interior, Bureau of Mines, RI 7386
State
ND
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