HIGH TEMPERATURE CARBONIZATION OF COAL 397
Coal. Ash in coal, per cent. Sulphur in coal, per cent. Sulphur found after carbonization.
In coke, per cent. In volatile productsr per cent.
No. 1 . . . 7-36 0-789 0-696 0-093
No. 2 . . . 5-76 0-973 0-844 0-129
No. 3 . . . 16-53 3-264 2-424 0-840
No. 4 48-31 1-746 1-352 0-394
The manner in which. the sulphur of coal is distributed after carbonization has been given by Short,1 who experimented with a Durham, coking coal containiiig 0-824 per cent, of sulphur when dry.
Distribution of Sulphur
Per cent, of total sulphur in coal.
Free sulphur. In coke 72-53
„ „ In tar ....•••■ 1'45
Sulphur as H2S. In gas ) ..... 24-0
„ „ „ In liquor j
Sulphur in In gas ) . . 1-72
other forms. In liquor) '
Difference (unaccounted for) ....................................... 0-30
The Gas Investigation Committee 2 have calculated the distribution of sulphur from the results of a series of tests carried out with continuous vertical retorts at Uddingston gasworks. The effect produced by steaming the coal charge is shown in the following table :—
Eitect of Steaming on Distribution of Sulphur
Coal charge. Unsteamed. Steaming at 32*7 per cent.
Sulphur in coke „ „ liquor „ gas „ lost 59-7 per cent. 3-8 „ „ 7-7 „ „ 21-3 „ „ 7-5 „ „ 43-9 per cent. 8-6 „ „ 6-9 „ „ 39-3 „ „ 1-3 „ „
DISTRIBUTION OF ELEMENTS IN COAL AND GAS
Below is set out a table showing the approximate distribution of the elements in a ton of coal and th.e manner in which each element exists after the process of carbonization. The table is, of course, merely illustrative, and does not do more
1 J. Soc. Chem. Ind., 1907, vol. 26, p. 581. 2 Proc. Inst. Gas Eng., June, 1920.