Method for the pneumatic injection of metered quantities of powd

Details Method for the pneumatic injection of metered quantities of powd Method for the pneumatic injection of metered quantities of powd

1990-03-07

1992-06-23

Andrews, Melvyn J.

Metallurgical apparatus

Process

Tuyere operation

75460, C21B 716

Patent

active

051236320

ABSTRACT:
The method consists in forming in a single metering device a pneumatic mixture comprising the powdered substances and the propellent gas, in propelling this mixture through a common main 18 into a distributor 20 in which the mixture is split into secondary currents which are sent to each of the injection points respectively through secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n, in determining the flow rate in each of the secondary pipes 22.sub.1, 22.sub.2, . . . 22.sub.n by the tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n flow cross-sections and in influencing the transport conditions in each secondary pipe 22.sub.1, 22.sub.2, . . . 22.sub.n by acting on the pressure P3 downstream from each tuyere 28.sub.1, 28.sub.2, . . . 28.sub.n in order to maintain this pressure at a determined value.
The method is aimed more particularly at the injection of powdered coal into a blast furnace.

REFERENCES:
patent: 3365242 (1968-01-01), Marchetti
patent: 4014577 (1977-03-01), Clancy et al.
patent: 4389244 (1983-06-01), Yarosheysky et al.
patent: 4702182 (1987-10-01), Ulveing et al.
Patent Abstract of Japan-vol. 7, No. 74 (M-203) [1219] Mar. 26, 1983 (Seisakusho).
Patent Abstract of Japan-vol. 7, No. 143 (C-172) [1288] Jun. 22, 1983 (Kogyo).
Patent Abstract of Japan-vol. 7, No. 169 (M-231) [1314] Jul. 26, 1983 (Seitetsu).

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