Study of Thermal Performance of Modern Design of the Drum-type Batch Furnace

The report focuses on the layout and features of the thermal performance of the drum-type batch furnace for heating of metal products for hardening. Technical characteristics of the furnace, some results of the thermomechanical calculation are given. The computer simulation of the processes of gas flow and heat exchange in the furnace is presented. The study has been carried out using the CAE-system (CAE, Computer Aided Engineering)—the software module ANSYS Fluent. In this module, the flow boundary conditions were specified. To check the repeatability of calculations, the control of current values and calculated temperature discrepancies has been used. The results of the simulation are presented graphically and contain a visualization of the field of temperature and velocity distribution, as well as a vector distribution of  gas flow rates. The obtained results of the computer simulation allowed evaluating the efficiency of the thermal and gas-dynamic performance of the developed design of the drum-type batch furnace with a constant temperature of the operating space. The developed design of the furnace for heating of metal billets with moving of billets in the furnace along the drum allows solving of some problems of resource and energy saving; it could also be used for heat treatment of bars, pipes, strip, and bar sections of various shapes. Keywords: batch furnace with a constant temperature of operating space, recuperative burner, computer simulation, temperature fields, velocity fields, resource saving, burning, heat exchang

Technical Upgrading and Thermal Performance of Heating Furnace of the Pipe Rolling Workshop

The report is focused on the design and thermal performance of the continuous furnace for heating of pipe billets before piercing operating at ‘ChPRP’ PJSC. The problems arising during operation of the thermal generating unit have been analyzed. To evaluate the efficiency of existing heating system, the heat balance of the continuous furnace has been drawn up. During analysis of the results of calculated studies, disadvantages of existing furnace systems and assemblies have been revealed. In order to improve the quality of metal heating, it is proposed to install the through-type furnace heated by means of regenerative burners, as well as provided with the metal transportation system, ensuring more uniform heating, both along the length and thickness of billets, in place of the existing furnace. When implementing the proposed activities, a significant economic benefit is expected, which is confirmed by the heat balance of the through-type furnace given in the article. Besides, to visualize the distribution of temperature and gas-dynamic flows within the operating space of the proposed through-type furnace, the computer simulation for evaluation of the uniformity of metal heating has been performed. Keywords: continuous furnace, regenerative burner, energy saving, through-type furnace, heat balanc

Mathematical Model of Metal Heating in the Continuous Walking Beam Reheating Furnace

The article describes a two-dimensional mathematical model of metal heating in the continuous walking beam reheating furnace. The mathematical description of metal heating includes a differential thermal conductivity quotation with initial and boundary conditions. The model incorporates dependencies between the thermophysical properties of heated metal and temperature. The process of pre-set plate heating with a time variable load was modeled in Ansys software. Distribution of temperatures over the slab section at the furnace exit was determined. The obtained results of the virtual experiment were compared with the data of theindustrial experiment carried out at the existing plant of a steel production factory. The comparison between the calculations of the adapted mathematical model and data of the industrial experiment showed a coincidence of 97%. The prospects for further use of the mathematical model in the automated control system of furnace thermal operation were defined. Keywords: continuous reheating furnace, thermal conductivity quotation, finite difference method, mathematical mode

Особенности конструкции термической печи с барабанным механизмом перемещения заготовок

One of the most energy-intensive industries is ferrous metallurgy. The metallurgical sector in industrially developed countries is reducing its specific energy consumption per one ton of products by approximately 1.0 - 1.5 % per annum. In Russia, obsolete technology is the main reason for the high-energy intensity of industrial product. Energy saving in industrial production is associated with production technology and the scope of fuel and energy resources consumption. Therefore, ways to improve energy efficiency focus on reducing energy consumption of any kind during a specific process in a specific process or thermal unit. Ensuring the economical operation of furnace units requires detailed preliminary and verification analyses, upgrading and introduction of state-of-the-art equipment. The study presents a flow diagram and features of thermal operation of a new drum-type chamber furnace for heating metal products for quenching. The technical parameters of the furnace, the results of the thermo-technical analysis, the heat balance and the specific fuel consumption as applicable to the created design are also presented. The flow diagram of the furnace has significant advantages in terms of the energy efficiency of fuel as compared to the roller and conveyor methods of metal transportation. Placing blanks on the drum significantly reduces the complexity of their transportation. Thanks to its small length the proposed design is compact and easy to place in a workshop. The use of a recuperative fuel burning device allows the efficient use of the heat of waste gases in the heating process. The proposed design and method of products transportation in the furnace working space can be used for the heat treatment of bars, pipes, strips, as well as rolled steel of various shapes. © 2021 National University of Science and Technology MISIS. All rights reserved

RESEARCH OF WORK OF THE GRS–150 RECUPERATIVE HIGH-SPEED BURNER

The paper presents the design and operation principle of the recuperative high-speed burner GRS-150, as well as the results of computer simulation of the processes of combustion and heat exchange using the ANSYS software package.В работе представлены конструкция и принцип работы рекуперативной скоростной горелки ГРС-150, а также результаты компьютерного моделирования процессов горения и теплообмена с использованием программного комплекса ANSYS

Analys of the methodical pepper on Chelyabinsk Pipe Plant for heating storage

The paper considers the heat work of the heating furnace located at the Chelyabinsk Pipe Rolling Plant. The resulted heat balance of the existing heating furnace, as a result of the analysis, revealed shortcomings in the work of the furnace. Measures have been proposed to eliminate the identified shortcomings.В работе рассмотрена тепловая работа нагревательной печи ТПЦ № 1 ОАО «ЧТПЗ». Приведен тепловой баланс существующей конструкции нагревательной печи, в результате анализа которого выявлены недостатки в ее работе. Кроме того, предложены мероприятия для устранения выявленных недостатков. Приведены ожидаемые результаты проведения реконструкции систем и способа транспортировки металла

The improving of the construction of chamber furnace

A scheme of new design and features of the thermal operation of a drum-type chamber furnace for heating metal products for quenching and tempering are presented. The technical characteristics of the furnace, the results of heat engineering calculation are given.Представлены схема новой конструкции и особенности тепловой работы камерной печи барабанного типа для нагрева металлических изделий под закалку и отпуск. Приведены технические характеристики печи, результаты теплотехнического расчета

ANALYSIS OF RING FURNACE FOR HEATING BILLETS ON CHELYABINSK PIPE ROLLING PLANT

This article considers the analysis of thermal performance annular heating furnace located at the Chelyabinsk Pipe Rolling Plant. There are problems arising from the operation of the furnace, given the purpose of the reconstruction of its systems and components. During the analysis of the existing system identified and suggestions for solving these drawbacks.В работе произведен анализ тепловой работы кольцевой печи для нагрева трубных заготовок ОАО «ЧТПЗ». Проанализированы проблемы, возникающие при работе печи. В ходе анализа выявлены недостатки существующей системы утилизации тепла и предложены мероприятия для решения данных недостатков. Приведены ожидаемые результаты проведения реконструкции печных систем и узлов

УПРУГОНАПРЯЖЕННЫЕ СЛОИ И НАНООСТРОВКИ GESISN В МНОГОСЛОЙНЫХ ПЕРИОДИЧЕСКИХ СТРУКТУРАХ

This work deals with elastically strained GeSiSn films and GeSiSn islands. Kinetic diagram of GeSiSn growth at different lattice mismatches between GeSiSn and Si has been established. Multilayer periodic structures with pseudomorphic GeSiSn layers and GeSiSn island array have been obtained. The density of the islands in the GeSiSn layer reaches 1.8 ⋅ 1012 cm−2 at an average island size of 4 nm. Analysis of the rocking curves showed that the structures contain smooth heterointerfaces, and strong changes of composition and thickness from period to period have not been found. Photoluminescence has been demonstrated and calculation of band diagram in the model solid theory approach has been carried out. Luminescence for the sample with pseudomorphic Ge0.315Si0.65Sn0.035 layers in narrow range of 0.71—0.82 eV is observed with the maximum intensity near 0.78 eV corresponding to a 1.59 µm wavelength. Based on a band diagram calculation for Si/ Ge0.315Si0.65Sn0.035/Si heterocomposition, one can conclud that luminescence with a photon energy of 0.78 eV corresponds to interband transitions between the X−valley in the Si and the heavy hole subband in the Ge0.315Si0.65Sn0.035 layer.Установлена кинетическая диаграмма морфологического состояния пленок GeSiSn при несоответствии параметров решетки между GeSiSn и Si от 3 до 5 %. На основе подбора толщины пленки GeSiSn выращены многослойные периодические структуры с псевдоморфными слоями и слоями, содержащими массив островков GeSiSn с плотностью до 1,8 ⋅ 1012 см−2 и средним размером 4 нм. Проведен анализ кривых дифракционного отражения для многослойных периодических структур. Показано наличие гладких гетерограниц, псевдоморфное состояние пленок GeSiSn и отсутствие изменений состава, а также толщины от периода к периоду. Получены спектры фотолюминесценции для структуры с псевдоморфными слоями Ge0,315Si0,65Sn0,035 с максимумом интенсивности фотолюминесценции вблизи 0,78 эВ, что соответствует длине волны 1,59 мкм. Проведен расчет зонной диаграммы с использованием подхода model solid theory. Исходя из результатов расчета зонной диаграммы, установлено, что обнаруженный пик люминесценции соответствует межзонным переходам между X−долиной в Si или между ∆4−долиной в Ge0,315Si0,65Sn0,035 и подзоной тяжелых дырок в слое Ge0,315Si0,65Sn0,035. Результаты исследований демонстрируют бездислокационные структуры с упругонапряженными псевдоморфными слоями и слоями, включающими массив островков высокой плотности. Дальнейшее изучение многослойных периодических структур будет направлено на увеличение содержания Sn и сравнение оптических свойств структур с островками и без островков