Device and method for measuring liquid level depth and relative position of melting pool of converter

Abstract

The invention relates to a device and method for measuring the liquid level depth and relative position of a melting pool of a converter, and mainly aims to solve many technical defects existing in the measurement with wood blocks and measuring rods. According to the technical scheme, the device for measuring the liquid level depth and relative position of the melting pool of the converter includes a measuring rod, and the measuring rod is fixed on an oxygen lance through bolts. The device is characterized in that a tension sensor and a displacement encoder are arranged on the oxygen lance, and protective covers are additionally arranged outside the tension sensor and the displacement encoder. Through the displacement encoder, the liquid level depth and relative position of the melting pool of the converter are accurately measured.

Description

technical field [0001] The invention relates to the field of converter smelting, in particular to a device and a measuring method for measuring the depth and relative position of the high-temperature metal liquid surface of a converter. Background technique [0002] At present, in steelmaking production, it is often necessary to measure the reference height of the molten metal in the converter, so as to accurately know the height of the molten metal in the converter, and then adjust the working position of the top-blown oxygen lance. The existing technology is to use a long iron rod, insert one end of the iron rod into a round wooden block, then install the wooden block in the nozzle hole of the oxygen lance, then lower the oxygen lance, and after lowering the oxygen lance to a certain height, make the iron rod Enter a part of the molten metal, then lift the oxygen lance, and judge the height of the molten metal through the melting mark of the high-temperature melt on the ir...

AI Technical Summary

Problems solved by technology

There are certain disadvantages in this operation: 1) The wood block and the metal nozzle of the oxygen lance have different thermal expansions, and the metal nozzle will expand slightly in the high-temperature furnace cavity, and the wood block is easy to fall off from the oxygen lance nozzle, resulting in measurement failure; 2) Converter The temperature in the furnace cavity is about 1000°C, and the metal liquid is about 1200-1400°C. Wood blocks burn very fast in this temperature range and are prone to fall off; 3) Under the conditions of 2) above, the operating requirements for the oxygen lance are relatively High, not only need to immerse the iron rod in the molten metal to have a certain amount of combustion loss, but also prevent the wood from overburning, which has a certain degree of difficulty in operation; 4) There are bottom blow holes at the bottom of the converter molten pool, in order to keep the bottom blow unblocked, During the entire life cycle of the converter, nitrogen or argon has been blown into the metal liquid, the metal liquid is in a state of turbulence, the density of the metal liquid is relatively high, and the horizontal direction of the impact on the immersed iron rod in the process of falling is unpredictable. The disturbance resistance will increase with the increase of the depth, the wooden block has limited fastening effect on the iron rod, and it is easy to deflect, which will bring errors to the measurement; 5) There is a slag layer on the surface of the molten metal. When the slag layer crusts, The resistance encountered by the iron rod in the process of falling is easy to deflect, which will bring a large error to the measurement, or even fail; 6) Due to the limitation of the burning of wood blocks, it can only measure the temperature of the molten iron level, which is lower than that of the molten steel, and cannot Measuring the molten steel level

Images