Analysis of efficient operating cycles for blastfurnace stoves. The blast furnace is the symbol of the steel industry. Jonas zetterholm a, xiaoyan ji b, bo sundelin c, peter m. This paper outlines the process model and modelbased control techniques implemented on the hot blast stoves for the no. Usually a stove is on blast for 90 mins and on gas for 120 mins.
Numerical study and structural optimization of a top combustion. Blast furnace gas has a high carbon monoxide co content and a low heating value, typical. The blast furnace basic oxygen furnace bfbof process accounts for nearly 70 % of the world crude steel production 1. The stoves are heated up with blast furnace gas as the only fuel. Combustion of blast furnace gas in blast stoves raises two problems caused by the humidity. Further possible improvements in blast furnace technology are lower temperature blast enriched with high oxygen, probability of eliminating hot blast stoves and. The charge, which consists of iron ore, coke and limestone etc. Some files are rather large and may take some time to download, please be patient. This site is like a library, use search box in the widget to get ebook that you want. Blast furnaces are used to produce pig iron from iron ore for subsequent. High temperature top combustion hot stoves of kalugin design. Keywords s4 fems a hot blast stove is a facility to supply hot air to a blast furnace continuously.
The computer application will be implemented in the automatic control systems of a hot blast stoves block. The rise in the hot blast temperature leads to the reduction in the specific coke rate and enhancement of the specific productivity of blast furnaces, which essentially reduces the operating cost. These furnaces were repaired and put back to operation. On blast usually 3 stoves are designed for a single blast furnace, of which one stoves will be on blast and two stoves on gas. Blast furnace stoves operate as a unit in order to provide a continuous supply of hot blast to the furnace, this being done by alternating the stoves between cycles in which they heat the blast and cycles in which their checkerwork is heated.
Currently, the stoves of blast furnaces are operated at a higher temperature for increasing productivity. Hot blast refers to the preheating of air blown into a blast furnace. Pdf recent developments in blast furnace technology ijera. Effect of preheated top gas and air on blast furnace top gas. Coke, limestone flux, and iron ore iron oxide are charged into the top of. Blast furnace left, and three cowper stoves right used to preheat the air blown into the furnace. Preheated air was first used by james beaumont neilson in 1828 in glasgow, but not until 1860 did the englishman edward alfred cowper invent the first successful. Model development of a blast furnace stove sciencedirect. Blast furnace gas cleaning plant nippon steel engineering. In the past, there were a few major refractory failures in blast furnaces of tisco, viz. View and download united states stove hotblast 0 owners manual online. Premature failures also were experienced in the hot blast stoves, particularly in the checkers. Among their ancillary facilities, the stoves require the highest energy supply.
Smelting the iron ore required a large amount of heat, and a furnace was needed to contain the materials and withstand the high temperature. Blast furnace and stoves eurotherm by schneider electric. Hot stoves are regenerative heat exchangers that are normally heated with blast furnacetop gas. Blast furnace, a vertical shaft furnace that produces liquid metals by the reaction of a flow of air introduced under pressure into the bottom of the furnace with a mixture of metallic ore, coke, and flux fed into the top. The production of large blast furnaces of china in 2017 the production of large blast furnaces of china in 2017.
Analysis of efficiency and reliability of blastfurnace process. To maximise the efficiency of the stoves, they are operated at high temperatures. The reducing gases leaving the blast furnace are cleaned by passing them through electrostatic precipitators which capture the dust. The hot blast stove is one of the most important equipment devices in the blast furnace iron making process. An attempt has been made to evaluate the refractories available from indigenous sources. The air blast is heated in hot stoves up to 110050 c. Hot blast stove definition is an apparatus used to preheat the blast for an iron blast furnace and consisting of firebrick passages which alternately receive heat from burning gas and then give up this heat to the incoming blast. In a blast furnace, fuel coke, ores, and flux limestone are continuously supplied through.
Improvement of the performance of blast furnace stoves. Blast furnace an introduction blast furnace is the focus of any integrated steel plant. Stoves were added to heat the blast, and as these stoves were made larger and larger, the furnaces became larger. At the slag pit the slag is water cooled, processed, and sold as aggregate material. View and download united states stove company hot blast 1400 owners manual online. Repair and maintenance practices of blast furnaces and hot blast stoves article in transactions indian ceramic society 411. Air heated in the blast furnace stoves, is applied from the bottom of the. This unit is made with a firebrick lined plate steel firebox surrounded by green powder coated steel giving the. Pdf technological changes in blast furnace iron making. Click download or read online button to get blast furnace simulation book now. Pdf the production of large blast furnaces of china in. The 57 add on furnace is designed to use in conjunction with your existing hvac ductwork and work seamlessly with your existing furnace.
The principle of blast furnace operational technology and. It is then used as part of a predictive control scheme to determine the minimum amount of fuel necessary to achieve the blast air requirements. Consequently, the demand on the quality of checker bricks has increased. A large amount of energy is required in the production of steel where the preheating of blast in the hot blast stoves for ironmaking is one of the most. Apart from blast furnace proper blast furnace section includes many other accessories.
Pdf mechanical strength of briquettes for use in blast. It is the operators skill to adjust the operation of these stoves to attain maximum dome temperature and hot blast temperature consistently to the furnace. A stove comprises a metal jacket the inner surface of which has a gunite coating with a layer of metal or a heatresistant synthetic material sprayed on the surface of said coating to form a continuous gastight cover. May 03, 2010 the iron making blast furnace itself is built in the form of a tall chimneylike structure lined with refractory brick. The briquetting process is a usual measure taken for recycling materials such as ironmaking waste dust and sludge from blast furnaces, which can be reutilized in. C u the energy loss through heat radiation from the stove body has been reduced by approx. Evaluation of checker bricks for blast furnace stoves. About one third of the world primary energy consumption is. United states stove hotblast 0 owners manual pdf download.
There are three or four stoves serving one blast furnace. The dome portion of the stove can conveniently be constructed of firebrick so that the stove shell or wall. Hot blast stoves latest developments, assessment and lifetime extension eric schaub1 cristiano castagnola2 johannes munzer3 andre oliveira4 luis fernando vieira5 abstract hot blast stove systems are an important equipment of a blast furnace plant. Blast furnace stove dome and hot blast main the quality and composition of iron produced in the blast furnace is directly related to the hearth temperature. Like other building types which attract the bechers, it is also an endangered industrial species. Faster ovens that allow smoker and blast furnace functions. Nov 24, 2015 features of hot air stove the vault of hot air stoves has stable structure and rational air flow distribution choose appropriate refractory materials for different work zones of hot air. Burner burner burner burner low top combustion hotblast stove metallic. Hot blast stoves are very important auxiliary equipment to the bf process, providing hot blast to the process.
Essentially giant, coneshaped circular stoves, blast furnaces dominate the cityscapes of pittsburgh, youngstown, and birmingham much as religious structures dominated medieval cities. The function of the hot blast stove is to provide hightemperature blast. Hot blast stoves define in many respects the technoeconomics of blast furnace operation. Hotblast stove definition of hotblast stove by merriam. During the last years, performance requirements and operation practice for the hot. The stoves are tall, cylindrical steel structures lined with insulation and almost completely filled with checker bricks where heat is stored and then transferred to the blast air. A detailed analysis of the stoves operation at aceralia cs has allowed an increase in blast temperature of 30 c up to 1230 c and of blast time up to 35 min without decreasing the blast volume. With a 550 cfm blower and up to 115,000 btus it is designed to heat a home up to 1900 sq.
Hot blast stove, apparatus for preheating air blown into a blast furnace, an important step in raising the efficiency of iron processing. Blast furnace gas is produced during the iron oxide reduction in blast furnace iron making in which iron ore, coke and limestone are heated and melted in a blast furnace and is an indigenous process gas of the steelworks industry pugh et al. A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron, but also others such as lead or copper. Stoves absorb heat from the combustion of blast furnace gases with air and transfer this heat to the air blast that will be injected into the blast furnace.
Blast furnace is used to reduce the iron ore to iron. If the number of stoves is three, one is on blast and two on heating. Pdf model development of a blast furnace stove researchgate. Highefficiency, longlife hot stove nippon steel engineering. The cleaned blast furnace gases are used to preheat stoves and boilers within the steel plant.
It is these core values that we take to heart with each product we produce. Blast furnace simulation download ebook pdf, epub, tuebl. Technological changes in blast furnace iron making in india. In the combustion heat accumulation phase, heat energy in hot exhaust gas from a burner is accumulated in checker bricks and, in the ventila. The blast furnace plant c h a p t e r 51 the blast furnace plant o u t l i n e 51. Our products are designed with a customer centric focus in order to provide clean, renewable and affordable heat to each and every one of our customers, past, present and future. Each stove is about as large in diameter as the blast furnace, and the height of the column of checkers is about 1. A hotblast stove is a facility to supply hot air to a blast furnace continuously. Once your manual is viewable, save the file to your computer. United states stove hotblast green coal warm air furnace.
In tisco, the blast furnaces are operated at a hot blast temperature of 900c. A detailed heat transfer model of the stoves is developed. View and download ussc hotblast 57m owners manual online. These small 20 foot diameter silica design stoves were built in 1985 and operated for three years. The mixture of blast furnace top and coke oven gases was considered as fuel for hot blast stoves 4.
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