Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Kozo Tanaka

Kenjiro Motonaga

Setsuo Tamura

Takumi Mizokawa

Kazuo Tanaka

Tomio Suzuki

Hiroyuki Komatsu

Ryoichi Hirose

Keisuke Tanimoto

Katsumi Kawashima

Takaaki Hiwatashi

Shinichi Tamada

Takayuki Sugahara

Taketsugu Kasai

Disclosed is a pulverizing, drying and transporting system for a pulverized fuel of a blast furnace of the type having at least one hot stove for supplying hot blast air, said hot stove also providing hot stove exhaust gas. The system includes a pulverizing and drying unit for pulverizing lamp raw fuel and drying the pulverized fuel. The hot stove gas is supplied to the pulverizing and drying unit. The hot stove exhaust gas dries the pulverized fuel and conveys it to a pulverized fuel collecting and separating device which separates the gas from the pulverized fuel. The line supplying the hot stove gas to the pulverizing and drying unit includes a heating device for selectively supplying additional heat to the hot stove exhaust gas. Moreover, the line for supplying the hot stove gas to the pulverizing and drying unit can include at least one of a temperature stabilizing device and a cooling device. The heating and cooling devices and controlled by a controller sensitive to the gas temperature at the outlet of the pulverizing and drying unit for maintaining the gas temperature at the outlet of the pulverizing and drying unit at a constant level. The temperature stabilizing device maintains the gas temperature at the outlet of the temperature stabilizing device at a designated level.

Pulverizing, drying and transporting system for injecting a pulverized

In a method of controlling the pulverization and dryness of a flammable material such as coal, the system is provided with both a push blower upstream from the pulverizer and a pull blower downstream from the pulverizer. The system is controlled so as to maintain the pressure within the pulverizer at an average equal to substantially the atmospheric pressure. In the method for controlling the pulverizing rate, a preset desired differential pressure across the pulverizer is maintained constant while the pulverizing motor speed and the pulverizing material feed rate are modified.

Method for controlling the pulverization and dryness of flammable

A method for injecting a pulverized fuel into a blast furnace uses a pulverulent fuel injecting burner which is protruded into a blow pipe through a wall thereof near the tuyere of a blast furnace. The burner injects a pulverized fuel into the blast furnace along with a hot blast of air at a temperature higher than 950.degree. C. flowing through the blow pipe. The tip end of the burner is located at a distance L between 100 and 350 mm upstream from the boundary between the tuyere of the blast furnace and the blow pipe. According to one embodiment, the tip of the furnace is tapered by an angle .theta..ltoreq.1400L.sup.2 -1290L+295. According to a second embodiment, the inner diameter B.sub.1 of the blow pipe, and the inner and outer diameters of the burner tip (d and D) are selected such that 0.1.ltoreq.(D/Bi).ltoreq.0.25 and 0.6.ltoreq.(d/D).ltoreq.0.8. According to a third embodiment, the burner tip is removable.

Method and apparatus for injecting pulverized fuel into a blast furnace

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Miki, Japan

Kozo Tanaka