2018a.     KUROSAWA, K.  Pulverized-Coal Gas Producer.  Jour. Fuel Soc. Japan, vol. 30, 1951, pp. 7-13; Chem. Abs., vol. 46, 1952, p. 3,237.

        Problems relating to this subject are analyzed from the standpoint of low-grade domestic coal.  When compared with the Winkler producer, the plant for gasification of pulverized coal for synthesis gas has the advantage that any kind of coal can be gasified, the capacity is large, the construction is simple, the elasticity of capacity is good, and the danger of clinker formation is small.  Fine coal used in the plant contained 75% of powders under 4,900 mesh.  The rate of gasification is 155-200 kg. per m.³ per hr.  The utility of C is 95%.  The gasification chamber must be constructed almost spherically for efficient use of radiating heat.  As the temperature in the chamber is very high, special attention must be paid to the selection of firebrick and to heat recovery, but the higher construction expenses can be sufficiently compensated by the greater rate of gasification.  The minimum economic unit of this plant is about 10,000 m.³ per hr.  According to the heat balance, the synthetic heat efficiency is 78% when the sensible heat of gas produced is recovered by the waste heat boiler.  The necessary equipment for a 10,000 m.³ per hr. plant is briefly described, and the construction costs and gas production cost are estimated; the possibility of cheap synthesis-gas production with log-grade domestic coals is suggested.

        KURZEN, F.  See abs. 3067, 3069.