New Monitoring System of Firebrick Lining Deterioration of Blast Furnace Devil in Metallurgical Plants of China

Abstract

The mathematical description and the computer program Devil Erosion of calculation the two-dimensional temperature fields in any vertical and horizontal section of the blast furnace hearth are developed. Calculation is carry out the decision of the equations of heat conductivity with use of indications of the big number of sensing transducers of temperature (to 1000), built in the furnaces firebrick lining between the firebrick blocks. The continuous control of the temperature change in each point allows to define the remained thickness the firebrick lining and to warn, in case of need, the furnace personnel about the beginning of the firebrick lining erosion. The continuous control of change of temperature in the firebrick lining is made on the basis of mathematical model. The system of collecting, processing and transfer information from sensing transducers of temperature or thermal streams in a program database Devil Erosion is used. Programs are installed on blast furnaces of Chinese National Republic: Jinan, Jiyuan and Liuzhou Iron and Steel Works.

The Determination of Thermocouples Optimum Number in the Blast Furnace Hearth for Control of its Condition

“…7. For the offered model of a crazing [1,2] the special role is played by the group of sensors located in the hearth bottom center: on an imaginary axis of the furnace rotation the joining of profiles of a crazing on vertical sections is made for combining in three-dimensional model. If it will not be possible to define thickness of the hearth bottom center -to construct model of a crazing it will not be possible.…”

“…On all four blast furnaces in which testing of model of a crazing [1][2] was made the arrangement of sensors oriented to an estimation of a laying condition by a technique of V. G. Makienko [7] was used. Let's consider shortcomings of an arrangement of sensors which complicate an estimation of a laying condition.…”

“…Operation of the monitoring system of a flameproof lining condition [1][2] is based on calculation of a laying temperature field on the basis of information received from thermocouples located in it.…”

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The algorithm of a sensors arrangement in the blast furnace laying taking into account classification and the indications analysis of doubtful temperature sensors in 5 blast furnaces of the People's Republic of China is developed. When developing algorithm the adaptation of an arrangement of temperature-sensitive elements in a laying to the developed mathematical model of a laying heat [1,2] for the purpose of minimization of their quantity and increase in reliability of indications at the expense of increase of density of their arrangement in the most dangerous zones of a laying and an exception of superfluous sensors in the zones being characterized by low degree of wear. The scheme of an arrangement of thermocouples for the blast furnace in volume of 5100 m 3 is offered.

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The Estimation of the Thermal Properties of Refractory Materials According to the Temperatures Acceleration Curve at the Blast Furnace Blowing-In

“…The characteristics of materials declared by the manufacturer can differ from the actual. For creation of the mathematical model [1,2] temperatures distributions in a laying of the concrete furnace it is necessary to know thermal conductivity of materials of the specific parties used at construction of the furnace. Definition of the thermal conductivity coefficient allows adapt mathematical model for specific conditions of use.…”