A tuyere comprising an inner tube including a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a converging angle Θ from 30° to 60° connecting the lower section to the upper section, the inner tube terminating in an inner nozzle at a downstream end of the upper section; and an outer tube surrounding the inner tube so as to create an annulus there between, the outer tube including a lower section having a third diameter larger than the first diameter, an upper section having a fourth diameter smaller than the third diameter but larger than the second diameter, and a converging transition section having connecting the lower section to the upper section, the outer tube terminating in an outer nozzle at a downstream end of the upper section.

Disclosed is a blast furnace apparatus includes: a rotating chute; a plurality of tuyeres; a profile measurement device configured to measure surface profiles of a burden charged into the blast furnace through the rotating chute; and a blowing amount controller configured to control a blowing amount of at least one of hot blast or pulverized coal in each of the plurality of tuyeres, in which the profile measurement device includes: a radio wave distance meter installed on the blast furnace top and configured to measure the distance to the surface of the burden charged; and an arithmetic unit configured to derive the surface profiles of the burden on a basis of distance data for the entire blast furnace related to distances to the surface of the burden obtained by scanning a detection wave of the radio wave distance meter in the blast furnace in a circumferential direction.

Disclosed is a blast furnace apparatus includes: a rotating chute; a plurality of tuyeres; a profile measurement device configured to measure surface profiles of a burden charged into the blast furnace through the rotating chute; and a blowing amount controller configured to control a blowing amount of at least one of hot blast or pulverized coal in each of the plurality of tuyeres, in which the profile measurement device includes: a radio wave distance meter installed on the blast furnace top and configured to measure the distance to the surface of the burden charged; and an arithmetic unit configured to derive the surface profiles of the burden on a basis of distance data for the entire blast furnace related to distances to the surface of the burden obtained by scanning a detection wave of the radio wave distance meter in the blast furnace in a circumferential direction.

Extraction device for extracting a tuyere part, in particular a tuyere or a tuyere cooler, from a shaft furnace, the device including a supporting frame with positioning elements configured to position the device against a furnace wall, a carriage supported by the supporting frame and movable in a direction radial to the furnace wall, an extraction rod having a first end attached to the carriage and a second end for connecting to the tuyere part, where the first end of the extraction rod had a stopper, the device further including a percussion system acting on the stopper of the extraction rod in a direction away from the furnace wall, and a pretensioning mechanism on the supporting frame configured to apply a load to the carriage, in a direction away from the furnace wall.

Methods, apparatuses, and systems to collect fine particle coal are provided herein. For example, these methods, apparatuses, and systems may be incorporated into a coal processing plant to collect a portion of the fine particle coal that is normally lost in the system. A fine particle coal also is provided. The fine particle coal may have a particle size of 1000 μm or smaller and a water content of from about 5% to about 20%, by weight.

Methods, apparatuses, and systems to collect fine particle coal are provided herein. For example, these methods, apparatuses, and systems may be incorporated into a coal processing plant to collect a portion of the fine particle coal that is normally lost in the system. A fine particle coal also is provided. The fine particle coal may have a particle size of 1000 μm or smaller and a water content of from about 5% to about 20%, by weight.

A tuyere comprising an inner tube including a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a converging angle from 15 to 35 connecting the lower section to the upper section, the inner tube terminating in an inner nozzle at a downstream end of the upper section; and an outer tube surrounding the inner tube so as to create an annulus there between, the outer tube including a lower section having a third diameter larger than the first diameter, an upper section having a fourth diameter smaller than the third diameter but larger than the second diameter, and a converging transition section having connecting the lower section to the upper section, the outer tube terminating in an outer nozzle at a downstream end of the upper section.

A tuyere comprising an inner tube including a lower section having a first diameter, an upper section having a second diameter smaller than the first diameter, and a converging transition section having a converging angle from 15 to 35 connecting the lower section to the upper section, the inner tube terminating in an inner nozzle at a downstream end of the upper section; and an outer tube surrounding the inner tube so as to create an annulus there between, the outer tube including a lower section having a third diameter larger than the first diameter, an upper section having a fourth diameter smaller than the third diameter but larger than the second diameter, and a converging transition section having connecting the lower section to the upper section, the outer tube terminating in an outer nozzle at a downstream end of the upper section.

A fluid assisted particle injector for a metallurgical furnace, comprising: an injector tube having an entrance end, an exit end and a removable tip; a cover tube disposed over the injector tube; a fluid and particle injector port in line with the longitudinal center axis of the injector tube and a secondary fluid port for directing pressurized fluid over the outside of the injector tube and within the cover tube; the injector tube defining a tapered internal bore having a particle entrance end and a particle exit end, wherein the diameter of the particle exit end is smaller than the diameter of the particle entrance end.

Extraction device for extracting a tuyere part, in particular a tuyere or a tuyere cooler, from a shaft furnace, the device including a supporting frame with positioning elements configured to position the device against a furnace wall, a carriage supported by the supporting frame and movable in a direction radial to the furnace wall, an extraction rod having a first end attached to the carriage and a second end for connecting to the tuyere part, wherein the first end of the extraction rod had a stopper, the device further including a percussion system acting on the stopper of the extraction rod in a direction away from the furnace wall, and a pretensioning mechanism on the supporting frame configured to apply a load to the carriage, in a direction away from the furnace wall.