Abstract
Application of pulverized-coal fuel (PCF) for coke saving is strategic direction of energy costs decreasing for iron smelting in PAO NLMK blast furnaces, which allows to change the structure of coals supply to the plant and to decrease their summarized consumption. Stages of the technology mastering considered, including period of adjusting the PCF preparation and their supplying to the blast furnaces and at the stage of charging system selection and blast regime adjustment ensuring the maximum degree of CO utilization and the specified performance. Analysis of the dynamics of coke consumption and fuel additives showed that the consumption of total carbon fuel remained almost unchanged, despite the difference in the amount of carbon supplied with natural gas and with the PCF. Calculations made by the mathematical model showed that with an increase in the PCF consumption and a decrease in the consumption of natural gas, the replacement rate of coke with natural gas increased by an average of 0.09 kg of coke per 1 cubic meter of natural gas. As a result of the iron smelting technology mastering, in the PAO NLMK BF № 2 a specific coke consumption decrease reached by more than 80 kg/t of iron and natural gas consumption decrease by more than 60 m3/t of iron. The conditions were revealed for the blast furnaces to operate as with minimum coke consumption and with maximum intensity. The blast furnaces operation in the determined regime parameters allow to decrease the fuel costs for iron production.
Highlights
Из приведенной на рис. 1 и 2 динамики изменения показателей расхода кокса и топливных добавок видно, что расход суммарного углерода топлива практически не изменился, несмотря на различие количества углерода, поступающего с природным газом и пылеугольного топлива (ПУТ)
strategic direction of energy costs decreasing for iron smelting in PAO NLMK blast furnaces
which allows to change the structure of coals supply to the plant
Summary
Использование пылеугольного топлива (ПУТ) для экономии кокса является стратегическим направлением снижения энергетических затрат на выплавку чугуна в доменных печах ПАО НЛМК, позволяет изменить структуру поставок углей на комбинат и снизить их суммарный расход. Выполненные по математической модели, показали, что при увеличении расхода ПУТ и снижении расхода природного газа коэффициент замены кокса природным газом увеличился в среднем на 0,09 кг кокса на 1 м3 природного газа. В результате внедрения технологии выплавки чугуна в доменном цехе No 2 ПАО НЛМК достигнуто снижение удельного расхода кокса более чем на 80 кг/т чугуна при снижении расхода природного газа более чем на 60 м3/т чугуна. Освоение технологии доменной выплавки чугуна с использованием пылеугольного топлива в доменном цехе No 2 ПАО НЛМК // Черная металлургия.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
