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0ANALYSIS OF LOAD CURVES FOR DSP -100 FURNACE Makhmutkhonov S.K.1, Kuuatbaev P.K.2
1Makhmutkhonov Sultonkhuzha Komolkhuzha ugli - Assistant, DEPARTMENT OF POWER SUPPLY, ELECTRIC POWER FACULTY, TASHKENT STATE TECHNICAL UNIVERSITY, TASHKENT;
2Kuuatbaev Polat Kamalovich - Assistant, DEPARTMENT OF ELECTRIC POWER, FACULTY OF PHYSICS, KARAKALPAK STATE UNIVERSITY, NUKUS, REPUBLIC OF UZBEKISTAN
Abstract: the article analyzes the graphs of electrical loads DSP-100. Regularities of changes in power consumption parameters are determined: total and specific power consumption. Recommendations for smoothing the graphs of electrical loads are given.
Keywords: specific consumption, power consumption, production, technological process, unit, steel.
UDC 621.311.12
Meltshop (EAF LLC "Uzmetkombinat") is a complicated technological complex consisting of a number of interconnected units. The workshop is composed of electric arc furnaces 100 tons each with a transformer capacity of 95 MVA and two furnaces with a transformer capacity of 60 MVA. The shop is equipped with varietal continuous casting machines, each has four streams. In addition, the shop has a set of complex steel processing machines, which heats the metal and carries out more operations to treat steel to the required quality. The cross-section of blanks - 250x320 mm. The shop melts carbon and low alloyed steel. Production is performed in one-slag process. Metal enters the casting ladle, hanging on the hook of a bridge crane. Casting ladles are lined with periclase-carbon products. Slag is removed from the plant in the slag container monitors trolleys.
Limestone in hopper cars are unloaded into the pits by grabbing crane with 10 tons capacity, and then fed into a hopper and then skip hoisted into the shaft lime kilns with capacity of 100 tons per day of finished lime with 85% activity. In site 2 of the furnace ready-made lime from the kiln is fed with skip hoists into silos and then on a conveyor gallery is fed into the feed bin of furnace DSP-100UMICand into continuous casting machine. Lime is a basic slag-forming component in the steel industry. Lime is used for slug induction and desulfurization of liquid steel. Specific lime consumption is 62.97 kg/t.
Complex steel processing machine
Complex steel processing machine steel is designed for steel processing in the ladle, which includes steel stirring through porous plug in the bottom of the ladle, while heated by the electric arc. Simultaneously steel undergoes chemical recomposition by added ferroalloys and coke. The unit is a steel-casting ladle with molten steel, mounted on a ladle-car and covered with arched roof; the heating is carried out using graphite electrodes 350 mm in diameter. The machine works in ensemble with electric furnace DSP-100 UMIC.
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Limestone specific power consumption,
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Fig. 1. Lime kiln monthly chart (January 2020)
After melting in EAF DSP-100 steel is poured in a ladle, mounted on the ladle-car, simultaneously with steel release begins inert gas blowing (argon, nitrogen). Ladle with molten metal is transported (via the railway) on complex steel processing site, which is located opposite the furnace in casting bay.
After ladle filing, steel is sampled, steel temperature, thickness of the metal layer and the slag are measured, at the end of these operations steel is being finished in terms of chemical composition and temperature. Complex steel processing unit is equipped with ferroalloys feeding system via pipelines from bins into the ladle through the roof, and an injection unit for injecting powder materials through the lance on top.
CSPM production, t
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CSPM EAF shop consumption, thousands
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CSPM EAF shop specific consumption, thousands kW*h
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Fig. 2. CSPM monthly chart (January 2020) Finishing of liquid steel in complex steel processing machine allowed:
1. Dramatically increase the production of steel due to separation of steel melting, i. e. furnace performs only melting of steel (intermediate) and phosphorus removal (harmful impurities), when the finishing of steel in chemical composition and temperature is produced in complex steel processing machine.
2. In turn, the transfer of finishing operations from a steel furnace to complex steel processing machine allowed reducing the unit cost of melting: electricity, refractories, electrodes, ferroalloys. Adjust the temperature and chemical composition more precisely.
3. Enabled flexible management of the entire cycle from melting to steel casting.
4. Improve steel quality through efficient desulfurization and averaging the chemical composition and temperature (which in turn improves steel castability) by ladle stirring through the porous plug in the bottom of the ladle.
5. Increase the casting speed at steel caster machine due to steel temperature stabilization at the end of processing (i. e., minimal temperature of casting start).
References
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