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Modern Gasworks Practice

Forfatter: Alwyne Meade

År: 1921

Forlag: Benn Brothers

Sted: London

Udgave: 2

Sider: 815

UDK: 662.764 Mea

Second Edition, Entirely Rewritten And Greatly Enlarged

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760 MODERN GASWORKS PRACTICE Thermal Efficiency of Straight Coal Gas Production (Horizontal retorts.) Heat Supplied. B.Th.U. Heat Recovered. B.Th.U. 1 ton of coal = 30,000,000 13,000 c. ft. gas at 520 B.Th.U. 2J cwt. coke used to heat i'etort per c. ft = 6,760,000 setting at 12,100 B.Th.U. per Ib = 3,726,809 13J cwt. coke and breeze at 12,100 B.Th.U. per Ib = 18,634,000 Total 33,726,800 130 Ib. tar at 15,500 B.Th.U. per Ib = 32 gal. 10 oz. of liquor containing 8 Ib. retort carbon at 14,500 B.Th.U. per Ib = 8 Ib. free sulphur at 4,100 B.Th.U. per Ib = Total reoovered .... B.Th.U. used and lost Total 2,015,000 105,000 116,000 32,800 27,662,800 6,064.000 33,726,800 27 662 800 Thermal efficiency of process = - ’ ~1’ x 100 = 82-2 per cent. 33,726,800 Thermal efficiency of gas production 6,760,000 12 824Ö0Ö X 100 = 52-7 per cent' In calculating the thermal efficiency of gas production it will be seen that in the production of 6,760,000 gaseous thermal units 6,064,000 units are lost. That is to say, out of a total of 6,760,000 6,064,000 12,824,000 units 6,760,000 units are recovered as gas. Theemal Efficiency of Steamed Charge in Vertical Retorts (30 per cent, steaming. Wet basis.) Heat Supplied. B.Th.U. 1 ton of coal_____________=30,000,000 30 per cent, steaming = 672 Ib. steam per ton of coal. Fuel for steam = 75 Ib. coke at 12,100 B.Th.U. per Ib____________= 907,500 Fuel required to heat setting, and gasified in retort = 3 cwt. coke at 12,100 B.Th.U. per Ib. . = 4,065,600 Heat Recovered. B.Th.U. 18,000 c. ft. gas at 445 B.Th.U. per c. ft..................= 8,010,000 12| cwt. coke at 12,100 B.Th.U. per Ib....................= 16,940,000 210 Ib. tar at 15,500 B.Th.U. per Ib........................= 3,255,000 45 gal. 10 oz. liquor containing 150,000 4 Ib. retort carbon at 14,500 B.Th.U. per Ib____________= 58,000 9 Ib. free sulphur at 4,100 B.Th.U. per Ib....................= 36,900 _________ __________ Total.................... 34,973,100 Total reoovered .... 28,449,900 B.Th.U. used and lost . . . 6,523,200 _________ Total.................... 34,973,100

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