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MONITORING SYSTEM OF WORK OF THE BLAST FURNACE HEARTH
It is designed for: - control for the difference of electric potentials on the jacket in the given sectors over the
- control of intensity of emission of melting products during their output from the hearth; - definition the moments of the beginning and the finishing of pig-iron and slag output
- control for changing of thermal condition of blast furnace; - control for changing of drainage conditions in the hearth; - control for changing of slag level over the circle of the hearth. The system includes: electric potential controllers in the blast-furnace hearth; measuring
blocks with power, filtration and input-signal-imitation modules and with multi-channel amplifier; PC with analog-input-signal adaptor.
The system has some variants, which differ in making complexity and functions realized.
The needed variant is defined in accordance with a customer.
Information output by the system reflected on the display monitor are tabular or graphical,
what is convenient for using in operational control of the blast furnace.
The system is performed in some variants varying on difficulty in producing and realized
functions. The choice of the variant is determined in accordance with the Customer.
The information given out by system is displayed on the screen in tables and diagrams, the
form of which is convenient for using during the operative control for the blast furnace.
Operation of system at concrete technological situations allows to carry out: - optimization of output mode of liquid melting products, due to specification of their
- stabilization of thermal condition of blast furnace bottom by changing the mode of
loading of burden materials on furnace throat and air blast parameters;
- stabilization of drainage conditions in the hearth, due to organization of its washing out; - control of circle operation irregularity of the furnace bottom and taking measures on its
liquidation. The system has been improving for 20 years.
Systems are introduced on Public Corporation "Yenakiyevo Iron and Steel Works", Public
Corporation "Alchevskij Iron and Steel Works", Public Corporation " Dnepropetrovsk Iron and Steel Works" named after Petrovskij.
The blast-furnace operation practice improvement on the basis of the system usage allows to
get a 9% increase in efficiency, and to reduce the coke expenditures to 1.2%.
16, Lenin, Alchevsk, Lugansk reg., Ukraine, 94204
Fax: (06442) 2-68-87; E-mail: email@example.com; http://www.dmmi.edu.ua
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Management of PDA in RDS In healthy term infants and preterm infants without RDS constriction and closure of the ductus arteriosus is complete within 48 hours of delivery in 90% of cases and in 100% by 96 hours.1,2 Closure is often delayed in preterm infants with RDS and is inversely related to gestational age. In one study 42% of infants < 1000g developed a significant PDA and this dec