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Contactless temperature control of molten metal

Contactless thermometric system (CTS)

1. Purpose

  The CТS is purposed for the technical realization of continuous distant temperature measurement, registration and regulation technologies in foundry, metallurgy, ceramic, glass and other industries. For example, it can be used for continuous temperature measurement of liquid metal in a stream or flow during tapping from metallurgical furnaces and aggregates, as well as the slab under mold in a continuous casting machine; metal sheet, strip or wire.

2. Operation principle

  It is based on the contactless radiation pyrometry of the controlled surface in zones and spectrum ranges with the most stable emissivity (ε) and transmissivity (τ), with the following processing of primary pyrometric information in accordance with the algorithms of multicolour, for example, symmetric-wave thermometry (SWT), eliminating influence of ε and τ.

3. Main tеchnical characteristics

Range of measuring temperatures, °С 600...2500.
Measurement error, % ≤1,0.

4. Advantages

  Measurement errors of known solutions, including the classical energy and spectral ratio radiation pyrometry, reach 10 percent or more under conditions of metallurgical production. This, at best, limits or completely excludes their practical use. The measurement errors of the CTS with SWT-algorithm are smaller than the classical energy, spectral ratio and the known multicolour thermometry ones in 4,9-13,2; 3,1-3,6 and 2,3 times, respectively.

5. Теchnical-economic efficiency

  CTS provides non-alternative continuous temperature control and optimal operation of the technological processes temperature regimes. Due to this fact, it is possible to obtain products with determined properties at the minimally possible resource and energy expenses. For example, in the case of electric arc and cupola furnaces, such temperature control reduces the coke consumption on 6-10 %, electricity on 15-20 %, increases the lining life duration on 25-35 %, reduces the waste of charge materials (environmental pollution) on 5-30 % and spoilage "due to the temperature" on 20-70 %.

6. Patent protection

  Protected by copyright certificates and patents.

CTS operation principle

Main elements of the СTS-SWT

Scheme of CTS-SWT elements placement on pouring furnace

CTS placement on cupola-furnaces with a closed syphon spout and a rotary mixer

Tuyere with primary transducer of the CTS on cupola-furnaces with a closed syphon spout and a rotary mixer

Primary transducer with tuyere and viewfinder device of the CTS on cupola-furnaces with an open spout and a rotary mixer

Carry-out digital indicator device of the CTS on cupola-furnace

Primary transducer with tuyere of the CTS on arc furnace

Carry-out digital indicator device of the CTS on arc furnace


  SWT is based on determined by us and sufficient for practical use correlation between emissivity value of metal alloys in condensed state in average part of operating range of spectrum and emissivity values on symmetrically placed boundary parts of spectrum. The established correlation allows obtaining the common pyrometric equation for a linear SWT, which is solved numerically with respect to the desired temperature of alloy T.

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