Abstract
Decrease of energy expenditure for hot metal smelting is an actual task in blast furnace technology perfection. Under conditions of PAO NLMK regimes with maximum forcing of the BF process at the expense of pressure increase under furnace mouth and coke hot strength increase were chosen as one of priority ways to increase the BF operation energy efficiency. Data on blast furnaces productivity, specific coke rate, quantity of blow-in oxygen and fuel at different gas pressure levels under the furnace mouth quoted. A dependence between pulverized coal rate and total carbon consumption determined. It was shown, that application in PAO NLMK blast furnaces of coke having hot strength of 60–65% at maximum possible pressure under the furnace mouth and application of pulverized-coal fuel enabled in the period from 2012 through 2018 to decrease the coke rate by more than 100 kg. Also the total carbon consumption decreased by more than 30 kg per hot metal ton and to increase smelting products chemical composition stability.
Highlights
Благодаря противоточному характеру процессов тепло- и массообмена в доменной печи (ДП) этот агрегат обладает самым долговечным и энергоэффективным металлургическим процессом
Decrease of energy expenditure for hot metal smelting is an actual task in blast furnace technology perfection
Under conditions of PAO NLMK regimes with maximum forcing of the BF process
Summary
Благодаря противоточному характеру процессов тепло- и массообмена в доменной печи (ДП) этот агрегат обладает самым долговечным и энергоэффективным металлургическим процессом. Это достигается за счет повышения давления под колошником при увеличении горячей прочности кокса. Повышение давления под колошником является одним из путей увеличения интенсивности плавки и снижения потерь тепла. Для сопоставления выбирались периоды работы с давлением под колошником ±10 кПа от средних значений при максимальном и среднем за период давлении.
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