Kawasaki Steel Corporation

Kiyoshi Horii

Masaaki Takarada

Tomohiro Marui

Hitoshi Aizawa

Minoru Mita

Yoshiaki Shimura

A spiral gas stream is generated in a pipeline when a uniform flow of gas flowing in a cylinder having inner diameter larger than that of the pipeline is introduced through a funnelform reducer into the inlet of the pipeline and bringing the mean gas stream velocity in the pipeline faster than 20 meter per second. The uniform flow of gas is formed in the cylinder easily when outside low pressure gas is fed into the cylinder through a feed gas inlet pipe installed diagonally at the side of the cylinder apart from the bottom plate so as to make the flow line of the feed gas to cross the axis of the cylinder and inclined toward the bottom plate. When solid particles are introduced into the spiral gas stream zone, they are transported to the outlet of the pipeline. As the compressed gas layer is formed along the inside wall of the pipeline by the spiral motion of gas stream, solid particles don't contact directly with the inside wall of the pipeline and don't hurt it. As the center part of the cross section of the pipeline becomes very low pressure, especially along the axis of the pipeline, solid particles containing or accompanying volatile matters are desiccated or concentrated as a result of the evaporation of volatile matters while being transported in the pipeline. Solid particles deposited on the bottom of water can be dredged and dehydrated by the spiral gas stream transportation system. When solid particles transported by spiral gas stream in two or more pipelines are arranged to collide with mutually, pulverized fine solid particles are recovered. A chemical reaction which can not or hardly to proceed at normal temperature and pressure is promoted in a spiral gas stream zone.

Apparatus and method for the generation and utilization of a spiral gas

In methods of automatically controlling the strip thickness in a rolling mill for producing a rolled product having a desired thickness and devices therefore, either an automatic gauge control (AGC) mode for controlling a deviation of the output thickness of a material being rolled from the predetermined desired uniform gauge thickness to be diminished to zero or an automatic reduction rate control(ARC) mode for controlling the rate of reduction of the material being rolled to a predetermined value is properly selected in accordance with the rolling condition, i.e., the degree of the actually measured output thickness deviation of the material or the progress of the rolling passes. Furthermore, as a method of and a device for automatically controlling the rate of reduction suitable for the ARC mode of the methods of and the devices for automatically controlling the strip thickness, the rate of reduction is controlled such that an output thickness of the material is calculated from an actually measured input thickness of the material and a desired rate of reduction based on the principle of the constant mass-flow rate of the material being rolled, an input thickness is estimated from the calculated output thickness, an input length and an output length, and an error signal between the estimated input thickness and the actually measured input thickness is diminished to zero.

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Chiba, Japan

Masaaki Takarada