chemical physics of discharges - Argonne National Laboratory

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‘c erperature, while the present experimental data were obtained at opereti:i;
conditions. Noreover, the experimental data were obtained from
coals at four different stages of reaction: raw coal, pretreated coal,
lw- t emperature gasification residue, and high- t emperature gasification
residue. Ash balances were used to put these results on a common basis.
The ash balance calculations gave the percent of carbon gasified in
each cDal or char. Raw coal was asswed t3 have 0s carbon gasified.
7-L~s Figure 6 shows the general trend of the heat of reaction.
Accurate heat-sf-reaction data are given in Table 1. Although the
pilot plant data are considerably scattered, the average value is not
tm different from that obtained by the other methods. The calorime-
try data also show some scattering, which is due to the hetemgeneous
nature of the mal, and the characteristics of the calorimeter and the
sensiw instruments. Examinations of the temperature measurement, the
pressure measurement, the temperature distribution in the calorimeter,
the total mass balance, and the calibration results obtained from the
cmstant-heat-input method and experimental runs on hydrogen and 2-
aecane reactions indicate that the data reported in Table 2 should not
::zve T: deviation greater than 10%.
This work is jointly sponsored by the American Gas Association and
tile U.S. Department of the Interior, Office of Coal Research. Their
suppopt is gratefilly acknowledged. Valuable advice and discussions
riere provided by Drs. B. S. Lee, S. A. Weil, and C. W. Solbrig of the
Institute of Gas Technology. J. R. WSando assisted in the experimen-
tal :.:3rl.;.