THE COMPLETE GASIFICATION OF COAL 763
(&) Vertical Retorts, 30 per cent, steaming— 1 ton coal ....... 75 Ib. coke for steam . £ 2 0 s. 10 1 d. 0 6
Less 9 cwt. coke ..... 0-5 cwt. breeze .... 17-5 gal. tar ... 45 gal. liquor .... Sulphur and carbon II II II II II O O O O o oo o o d. r 0 0 7 2 1 11 15 6 3
1 ton coal (net cost) ..... yielding 8,010,000 B.Th.U. Cost of gas in gas. . = 2-43(2. 0 16 3 per therm.
(c) “Äue” Water Gas— 1 ton coke ....... 750 Ib. coke for steam .... 2 0 5 15 0 0
Materials for manufacture .... yielding 18,000,000 B.Th.U. in gas. Cost of gas . Sélf-steaming Cost of. gas . 3 0 . . = 4<Z. per therm. ■ • — 3c?. „ ,, 0
\d) Complets Gasification— 1 ton coal ....... 600 Ib., coke for steam .... 2 0 10 12 0 0
Less 13 gal. tar ..... 10 Ib. sulphur .... .=08 .=00 2 8 3 0 2 8 0 10
Net materials for manufacture yielding 21,467,600 B.Th.U. Cost of gas in gas. . = 2-90cZ. 2 13 2 per therm.
Efficiency of process. Per cent. Efficiency of gas production. Per cent. B.Th.U. used and lost per 1,000 B.Th.U. recovered. as gas. Cost per therm of crude gas.
1. Straight coal gas (horizontal retorts) 82-2 52-7 897 3-01Æ
2. Vertical retorts (30 per cent.
steaming) 81-3 55-1 814 2-43c?.
3. “ Blue ” water gas 50-0 49-9 1,002 4-0<Z.
4. “ Blue ” water gas (self-steaming) 66-8 66-8 498 3-0rf.
5. Complete gasification . . 63-2 60-1 638 2-9CW.