Ihi Corporation

Takahiro Kozaki

Kazuhiro Watanabe

Akira Kobayashi

Masato Tamura

Kentaro Nariai

Emi Ohno

A vertical roller mill includes a housing, a chute that supplies materials to be grinded to a center portion of the housing, a grinder that is provided below the chute and grinds the materials to be grinded, an exhaust pipe that is provided above the grinder, a transport mechanism that forms an air flow for transporting, to the exhaust pipe, grinded materials grinded by the grinder, and a flow-constricting flow path provided between the grinder and the exhaust pipe and narrows a flow path area for the air flow, in which the flow-constricting flow path is formed between a first flow-constricting ring provided in the center portion of the housing and a second flow-constricting ring provided to protrude from the housing toward the center portion of the housing.

Vertical roller mill

The burner device for high-temperature air combustion according to the present invention is equipped with a thermal insulation portion () that is provided facing a furnace () and has a throat (); a burner nozzle () that is provided at the axial center of this throat and that injects a pulverized coal mixed flow () into the furnace through the throat; a windbox () that is provided so as to house this burner nozzle; an air register () that is provided at the distal end of the burner nozzle and that injects low-temperature secondary air from the windbox to the throat; a high-temperature air nozzle (), one end of which opens into the furnace through the heat insulation portion; and a combustion air switching means () that switches between injecting low-temperature secondary air to the throat through the air register and injecting high-temperature secondary air to the furnace interior through the high-temperature air nozzle, in which in steady combustion, low-temperature secondary air is injected to the throat through the air register by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle, and in high-temperature air combustion, high-temperature secondary air is injected to the furnace interior through the high-temperature air nozzle by the combustion air switching means and a pulverized coal mixed flow is injected from the burner nozzle.

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Tokyo, Japan

Takahiro Kozaki