Abstract: A process and apparatus for the metered introduction of fine-grain materials, particularly pulverulent solid substances (i.e., coal dust) from a pressurized metering container which contains a supply of solid material, into an industrial furnace having a plurality of feed locations such as a blast furnace or cupola furnace is presented. The solid material is fed to the individual feed locations in a carrier gas stream through a conveying duct, the gas stream being highly charged with the solid material. The carrier gas is fed to the lower end section of the metering container in a flow which causes a local loosening in the lower section of the supply of solid material with the conveying ducts opening into the loosening region. The apparatus includes a metering container, which is designed as a pressure vessel and which is adapted to be filled at its upper end section with solid material to be fed to the furnace. The metering container includes at its lower end section a plurality of upwardly open chambers.

Abstract: A process and apparatus for producing steel from scrap. A cupola furnace is provided with a layer of coke in the vicinity of the tuyeres of the furnace, with scrap to be melted being supplied upstream of the layer of coke and molten scrap passing through the layer of coke to a converter located downstream of the furnace. The molten scrap is refined in the converter with oxygen, thereby producing a CO-rich converted waste gas, which is supplied to the coke layer and burned in the vicinity of the tuyeres.

Abstract: A process and apparatus for delivering carbon i.e., coal dust, to be combusted in a furnace is presented. The furnace is of the type having plural combustion points and may include a shaft furnace such as, for example, a blast or cupola furnace. The carbon dust is delivered in dosed quantities to each of the individual combustion points in a separate air stream which is under a predetermined pressure. The carbon (coal dust)/carrier gas (air) is delivered to each combustion point in the furnace at super critical speed, i.e., the speed of sound, the carrier gas having a relatively high proportion of solid material therein. The actual quantity of carbon material delivered to each combustion point is directly detected and monitored as a consequence of volumetric measurement and is appropriately corrected by means of a secondary air supply when the carbon quantity either exceeds or falls below a predetermined nominal value.