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Literature Abstracts

 1628.    JOLLEY, L. J., AND BOOTH, N.  Underground Gasification of Coal.  Gas Research Board Inf. Circ. 2, Pub. 22; Gas World, vol. 128, 1948, pp. 588-595; Fuel, vol. 24, May-June 1945, No. 2, pp. 31-37; No. 3, p. 73-79.

       Bibliography of 123 refs. (see abs. 3698).  Extensive review of the literature on underground gasification, particularly of Russian sources, appears.  The average output/man employed was increased from 30 tons of coal/month by mining methods to the thermal equivalent of 100-120 tons by underground gasification; in large installations it might reach 500-600 tons.  The cost of standard coal in Russia in 1939 was 22-30 rubies (18-25 s.)/metric ton.  The cost of production of 1,000 kcal. of gas of low calorific value (100-150 B.t.u./cu. ft.) is stated to be 0.15-0.20 kopek (0.375-0.5 d.) and that of high-calorific-value gas to be 0.4 kopek (1.0 d./therm).  (The above figures do not appear to include labor costs.)  The cost of low-calorific-value gas is about 1/3 that of producer gas.  The net cost (exclusive of capital charges) of gas from normal producer installations is 0.74-1.21 kopeks/1,000 kcal. (1.84-3.0 d./therm), while that of gas from underground installations is 0.27-0.68 kopek/1,000 kcal. (0.7-1.7 d./therm).  The capital cost of underground gasification plant is stated to be 60-70% of that of a plant employing an above-ground producer.  In the Stream method 80-90% of the capital cost represents surface work and 14-15%, the preparation of panels.  The percolation method is stated to reduce capital investment by 15-20%.  For a combined underground gas-electric power generating station the capital cost is 1,500 rubies/kw. installed power and the prime cost of power, 4-6 kopeks/kw.-hr.  The cost of an O2 plant is estimated to amount to 70% of the total outlay cost and the cost of gas made with an O2 blast 3 times that made with an air blast.