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In-furnace-level-meter-and-antenna-therefore

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In-furnace level meter and antenna therefore

Details

Inventors: Nagamune, Akio; Tezuka, Kouichi; Kanao, Yoshiyuki; Komine, Isamu;
Assignee: NKK Corporation (Tokyo, JP)
Primary Examiner: Hellner; Mark
Assistant Examiner:
Attorney, Agent or Firm: Meller; Michael N.

An in-furnace level meter for measuring a slag level, or the like, in a convertor, and an antenna used therefore. An antenna position is controlled so that the distance between the antenna inserted in the convertor and the slag level can be established to be constant or within a predetermined range. A water-cooled structure antenna is used as the antenna.

DETAILED DESCRIPTION An object of the present invention is to provide an in-furance level meter which can measure a slag level position accurately and continuously even when the slag level in a furnace changes and which can be used even when the atmospheric temperature in the furnace is considerably high, and an antenna used in the in-furnace level meter.
Another object of the present invention is to provide an in-furnace level meter which can measure a level position of a target or a distance to the target accurately and continuously by using a low-cost apparatus without influence of the measurement environment in which dust or the like is present.
According to an aspect of the present invention, the in-furnace level meter has a microwave radar having a transmission antenna and a reception antenna inserted in a furnace, the microwave radar generating a microwave signals to the transmission antenna and generating a radar measurement value signal by calculating a distance between the antennas and a slag surface on the basis of the microwave signal reflected on the slag surface in the furnace and received by the reception antenna.
The transmission antenna and the reception antenna are moved up/down by an antenna up/down device.
The antenna position is measured by an antenna position measurer.
A signal processing section calculates an in-furnace slag level position on the basis of both the radar measurement value signal of the microwave radar and the antenna position signal of the antenna position measurer and calculates an antenna up/down distance by comparing the in-furnace slag level position with a set point or upper-limit and lower-limit set points, to thereby supply the antenna up/down distance as the antenna up/down control signal to the antenna up/down means.
The antenna up/down device performs antenna up/down control on the basis of the antenna up/down control signal to keep the distance between the transmission and reception antennas (hereinafter collectively called "antenna") and the slag level at a predetermined value

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