In-furnace level meter and antenna therefore
AssigneeNKK Corporation
InventorsAkio Nagamune, Kouichi Tezuka, Yoshiyuki Kanao, Isamu Komine
Life of this patent
Estimating the term…
Abstract
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.
Claims11
An in-furnace level meter comprising:
- a microwave radar having transmission and reception antenna to be inserted in a furnace, for supplying a microwave signal to said transmission antenna, for calculating a distanc between the antenna and a slag surface in said furnace on the basis of said microwave signal reflected from said slag surface and received by said reception antenna, and for outputting the result of said calculation as an output signal of a level measurement value;
- an antenna moving means for moving said transmission and reception antennas inserted in said furnace in an upward or downward direction in response to an antenna up/down control signal;
- an antenna position measuring means for measuring an antenna position to thereby provide an antenna position signal;
- and
- a signal processing section for calculating an in-furnace slag level position on the basis of said level measurement value signal of said microwave radar and said antenna position signal of said antenna position measuring means, and for calculating an antenna movement distance by comparing said in-furnace slag level position with a set point or upper-limit and lower-limit set points to supply said antenna movement distance as said antenna up/down control signal to said antenna moving means.
A water-cooled horn antenna for use in an in-furnace level meter, said antenna comprising:
- an inner metal pipe having an inside portion serving as a waveguide and an enlarged-diameter portion disposed at a front end thereof for serving as a horn antenna;
- an outer metal pipe surrounding said inner pipe;
- two cooling water paths formed by joining a front end of said inner pipe to a front end of said outer pipe while disposing a partitioning member substantially entirely between said inner pipe and said outer pipe, said two cooling water paths being communicated with each other at a front end side of the two pipes;
- and
- a cooling water inlet and a cooling water outlet respectively provided at base end sides of said cooling water paths.
A water-cooled horn antenna for use in an in-furnace level meter, said antenna comprising;
- first and second inner metal pipes each of which has an inside portion serving as a waveguide and an enlarged diameter portion disposed at a front end thereof for serving as a horn antenna;
- an outer metal pipe surrounding said first and second inner pipes;
- two cooling water paths formed by joining said enlarged diameter portion of said first and second inner pipes at their front ends with a front end portion of said outer pipe while disposing a partitioning member substantially entirely between said inner pipes and said outer pipe, said two cooling water paths being communicated with each other at front end sides of said pipes;
- and
- a cooling water inlet and a cooling water outlet respectively provided at base end sides of the cooling water paths.
A water-cooled parabola antenna for an in-furnace level meter, said antenna comprising a primary radiator having a water-cooled structure and a reflector having a water-cooled structure and having a parabola curved surface opposite to an aperture surface of said primary radiator, and in which said primary radiator is constituted by a set of waveguide and feeder having a water-cooled structure composed of a double or a treble pipe structure.
A water-cooled parabola antenna for an in-furnace level meter, said antenna comprising a primary radiator having a water-cooled structure and a reflector having a water-cooled structure and having a parabola curved surface opposite to an aperture surface of said primary radiator, and in which said reflector has a reflection plate having said parabola curved surface, a backplate disposed at a back surface of said reflection plate, a partitioning member disposed between said reflection plate and said backplate, a cooling water path formed by joining said reflection plate to said backplate at an outer circumferential portion thereof, a cooling water inlet, and a cooling water outlet.
Dependencies are inferred from the claim text.