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742. DOWNS,
C. R., AND RUSHTON, J. H. Tonnage
Oxygen. Chem. Eng. Progress, vol. 1, 1947, pp. 12-20; Chem. Abs.,
vol. 41, 1947, p. 2213.
Potential examples for the use
of tonnage oxygen are discussed at some length:
Gasification of coal, synthetic gas production, synthetic liquid fuels,
chemical products (Synthine process), H2SO4 and SO2,
and metallurgical uses. Costs are
calculated as follows:
Estimated total
plant and operating costs, October 946, for producing 95% O2
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Plant capacity……….…..tons per day.
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120
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240
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360
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480
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1,000
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Plant capacity…….…...….tons per hr..
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5
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10
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15
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20
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42
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95% O2 ……..…million cu. ft. per day.
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2.88
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5.76
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8.64
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10.52
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24.00
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Approx. plant cost …......million dollars.
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.9
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1.3
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1.7
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2.0
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3.4
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Total utility cost…....….dollars1 per
ton
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1.29
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1.27
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1.25
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1.22
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1.20
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Operating labor per ton, $80 per
day....
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.68
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.34
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.23
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.17
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.08
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Maintenance per ton, 2.5%………..….
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.54
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.39
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.34
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.30
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.25
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Fixed charges per ton, 12.5%……..….
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2.70
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1.95
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1.70
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1.50
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1.22
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Total
operating cost per ton….……...
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5.21
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3.95
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3.52
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3.19
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2.75
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Total
operating cost per 1,000 cu. ft...
……….cents………………………
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21.7
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16.5
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14.7
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13.3
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11.5
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Kw.-hr. per 1,000 cu. ft. for
compression…………………………
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13.4
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13.1
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12.8
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12.7
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12.5
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Kw.-hr. per 1,000 cu. ft. for auxiliaries
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2.2
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2.2
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2.2
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2.2
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2.2
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Total kw.-hr. per 1,000 cu. ft.
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15.6
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15.3
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15.0
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14.9
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14.7
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1Includes water, 1 cent per 1,000 gal.;
incidental electric power, 0.4 cent per kw.-hr.; steam, 30 cents per 1,000 lb.
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