In the last instalment we discussed the balance sheet of materials entering and leaving the furnace, showing the dis tribution of the ingredients of the charge and the blast into the various products and byproducts of the furnace. Stack maintenance allied mineral technical services blast. The furnace is cooled with water running inside part of the case and bricks. In this paper ironore conveyor system of blast furnace is considered for the preventive maintenance scheduling. Basic oxygen furnace bof steel making or basic oxygen furnace steelmaking bos or linzdonawitzverfahren steelmaking or the oxygen converter process is a method in which both molten pig iron and steel scrap are converted into steel with the oxidizing action of. Mar 06, 2016 introduction and construction blast furnace.
The gas cleaning system contains two stages, the coarse cleaning system. Therefore, this section is included as an introduction chapter, we can say as a refresher. It was a dramatic event, but it also had a positive effect, recalls starun. The blast furnace use of high reactivity coke or reduced iron is equal level or over it in. In the upper part of the blast furnace see figure 1. Yet the blast furnace had been due to keep producing pig iron for several more months before the next major repair was due. Rautaruukki company is good at combining process with. The energy in blast furnace gas in the forms of pressure and temperature is recovered by a trt generator after passing through the dust collector.
Thirumanam ennum nikkah english subtitles subscene download and convert the movie subtitles for jai lava kusa as. Once an item and a fuel are placed into the blast furnace, the block state changes to lit and the item is smelted twice as fast as a regular furnace. Due to the continuity of steel production, the conveyor system should run continuously. Pdf blast furnace ironmaking a view on future developments. Technical support document for the iron and steel sector. The energy in the furnace gas has been lost in the conventional wetprocess dust collector as the.
The report discusses acbfs aggregate production and properties, and the properties of concrete produced with acbfs coarse aggregate. 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. By malik mubashir university of the punjab lahore, pakistan 2. May 06, 2016 europes biggest blast furnace a colossus being made fit for the future made in germany duration. Indeed may be compensated by these employers, helping keep indeed free for jobseekers. How a blast furnace works twinkletwinklelittlestar.
The ussr was the world leader in largevolume blast furnace manufacture. Our technology base covers the entire blast furnace process route from hot blast and raw material handling, through the furnace and casthouse, to gas cleaning and hot metal slag processing. However, the price fluctuates significantly based on the type of furnace you buy. The improved blast furnace is created by placing 27 reinforced blast bricks in a 3x3 cube and placing a hopper on the topcenter block as illustrated. The blast furnace is a huge, steel stack lined with refractory brick, where iron ore, coke and limestone are dumped into the top, and preheated air is blown into the bottom. Combining the operating data from the jingtang steel plant with established static.
View and download united states stove hotblast 0 owners manual online. Modern blast furnace bf and converter bof gas cleaning a report of stateoftheart technology by franz reufer and christian davidi synopsis. R e f r a c t o r i e s f o r b l a s t f u r n a c erefractories for blast furnace 3 the chemical physical properties of the products. A blast furnace is usually built with a steel case and bricks made of magnesium oxide or other refractory material inside the case. Two large blast furnaces that began their operation in 2009 and 2011 respectively. Results of ultra high rates of natural gas injection into. Blast furnace trough materials and tap hole clay materials blast furnace trough materials trough mix the flow rate of molten metal and slag through the trough system increase many times in case of larger blast furnaces. Consequently, intermediate repair and revamping times must be kept to a minimum.
Description of a blast furnace plant main parts of a blast furnace, description and function composition of a charge in the production of pig iron in a blast furnace agglomeration and pelletization of iron ores requirements to individual components of a blast furnace charge time for the study. Shotcrete installation in the bosch of a blast furnace. Apr 28, 2014 how a blast furnace works the purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called hot metal. Tata steel will finance the repair of a blast furnace at britains largest steelworks in port talbot, wales, extending its life by seven years and soothing concerns about its commitment to europe.
Smallvolume blastfurnaces the future of blastfurnace. Community update no 5 blast furnace maintenance port. System for cleaning blastfurnace gas in the blastfurnace shop at. The blast furnace bfbased ironmaking process accounts for more. System for cleaning blastfurnace gas in the blastfurnace shop at the vszh koshitse combine. The blast furnace is a huge, steel stack lined with refractory brick. Tata steel uk looks set to extend the production life of blast furnace bf no5 at its port talbot facility in wales, to ensure it is able to produce steel beyond 2021, according to media reports. The pc injection adopted the concepts and theories of combining oxygen. Fuel is also used at double the rate of regular furnaces, so the number of items smelted per fuel stays the same. How a blast furnace works introduction the purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called hot metal. Blast furnace recovery and abnormal plant conditions lesson 9 the specific process of conducting a blast furnace recovery gives rise to additional risks significantly over and above normal operational risks. The system utilised eot crane for removal and placement of slag pot in the furnace pit. Stoves are also provided with waste heat recovery system and coke oven gas enrichment facilities, if coke oven gas is available.
Cast iron staves in the hearth, upper stack and throat five rows of copper staves are installed in the high heat flux zones of the bosh, belly and lower stack a new blast furnace shell means the use of the standard. A blast furnace, after it is blown in and the production of hot metal starts, runs for a large number of years before it is put down for relining. We did not there go into the question as to how the proportions. Tata steel uk likely to extend life of port talbot no5 blast. Basically, the blast furnace is a counter current heat and mass exchanger in which rising reduction gas loses most of its heat on the way up, leaving the furnace at a temperature of about 200. A blast furnace plant does not operate only its own blast furnaces but also a number of preparatory and auxiliary operations with relative autonomy. Rightclicking the center block of any face with a hammer forms the multiblock. Technological changes in blast furnace iron making in india since last few decades article pdf available in international journal of science and research ijsr 212. High levels of power requirement and rising energy costs present a major challenge to the metallurgical industry. The purpose of a blast furnace is to reduce and convert iron oxides into liquid iron called hot metal. Up to today, lining materials have been supplied to about 50 blast furnaces in italy and abroad always achieving excellent results and acquiring a solid reputation among the users. The blast furnace gas can be used to generate heat. Natural gas use in blast furnace injection has increased substantially in recent years as operators became aware of its operating and economic benefits. Blast furnace tapping operations involve removing the slag and then tapping molten lead from the furnace into molds or ladles.
Methods of shutting down a blast furnace ispatguru. A realtime 3d measurement system for the blast furnace burden. The charge, which consists of iron ore, coke and limestone etc. Pdf within many industries there is a constant drive to reduce. The major repair in a blast furnace s campaign life is the replacement of the lining. Kme staves achieve very high lifetimes due to their good thermal and crystallisation properties. Forging furnaces use an open fireplace system and most of the heat is transmitted by radiation. In the furnace, hot metal along with slag is processed from the raw material which gets collected in the hearth and blast furnace gases come out of blast furnace from the top. The remaining 25% provides heat at the sinter and coking plants and, in the form of byproduct gas. Secondary lead smelter etool smelting blast furnace. Community update no 5 blast furnace maintenance port kembla steelworks, february 2016. Hot blast stoves supply hot blast after heating cold air provided by turbo blowersfans to blast furnace through hot blast main, bustle main, tuyere stocks and tuyeres. Improvements in blast furnace operation usually have significant impact on the wellbeing of the company.
Blast furnace is used to reduce the iron ore to iron. Use of aircooled blast furnace slag as coarse aggregate. Though it has been almost completely replaced by bof and eaf steelmaking in many highly industrialized countries, the open hearth nevertheless accounts for about onesixth of all steel produced worldwide. The blast furnace and its ancillary facilities are very complex and dynamic systems.
View and download ussc hotblast 57m owners manual online. Primetals has developed its own dry gas cleaning bag filter technology called merim which. To get good campaign life special attention must be given to both. Schedule of a basic oxygen steel plant university of twente. 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. Blast furnace production in the ussr is characterized by the use of highly mechanized and automated equipment and advanced technology. C, while descending iron oxides are wholly converted to metallic iron walker, 2000. A wettype gascleaning system can remove up to 60% of the zinc and lead in the flue gases of blast. The no 5 blast furnace has been operating at or near full production since the reline in 2009 and last year produced around 2. Indeed ranks job ads based on a combination of employer bids and relevance, such as your search terms and other activity on indeed. Blast refers to the combustion air being forced or supplied above atmospheric pressure.
Pelletizing a pellet plant contains a series of balling drums where the iron ore concentrate is formed into soft pellets, in much the same manner that one rolls a snowball, to make a pellet about the size of a marble between 14 and 12. Development of recommendations on the maintenance technologies of blast furnace. Pdf technological changes in blast furnace iron making in. The maintenance of hot metal ladles will be done in the slag aisle using 155t crane. System for cleaning blastfurnace gas in the blastfurnace. This furnace has an historical rate production of 2. As the mixture of iron ore, coke and limestone heats, the hot waste gases are collected and cleansed.
Stack maintenance amts provides a range of services and technical expertise for stack maintenance in blast furnaces. Experience has shown that the dust content of the gases leaving a blast furnace can be cut by 4 mgm 3 by using a simple and reliable gascleaning system that includes a dust catcher, wet scrubber, venturi tues, valve group, and water separator. Ofurnace dust enters between gasket and furnace shell and into compensators ocompensator fills with dust and locks stave movements oweld of pipe to stave body fails in fatigue owater leaks into furnace. This is particularly true of the ironmaking blast furnace which the world steel. Blast furnaces are used continuously and are only shut down when their brick lining needs replacing. Fuel injection into the blast furnace as a substitute for expensive coke has become an accepted asset in the art of ironmaking. Design and maintenance consideration for blast furnace fuel. Port talbots steelworks will be owned by europes second largest steel firm after metals giant thyssenkrupp agreed to merge with tata. Air heated in the blast furnace stoves, is applied from the bottom of the furnace. The significance of improving the refractory configuration, the installation methods, and the short turnaround time for the repair will be discussed. Blast furnace refractory lining and causes of failure. Air heated in the blast furnace stoves, is applied from the bottom of the. The principle of blast furnace operational technology and. R e f r a c t o r i e s f o r b l a s t f u r n a c erefractories for blast furnace 10 grogastu 1.
Blast furnaces are used to produce pig iron from iron ore for subsequent. The furnace temperature is maintained at around 1200 to 1250 oc. The total energy use distribution 24 by various units of the steel plant coke ovens, sinter plant, blast furnaces, steel shop, rolling mills, and power plant is shown in figure 4. The other smelters cast the furnace metal into blocks and allow the blocks to solidify. On this channel you can get education and knowledge for general issues and topics you can sponsor us by sign up by clicking on this link. Slag handling the existing slag handling system from the furnace was cumbersome and presented a continuing threat to smooth operation of the furnace. Impact of operational parameters on fuel consumption of a blast furnace. Furnace gas is a gas which is produced in different types of furnace during the production of metals. Best available techniques reference document on the production of iron and steel december 2001.
Blast furnace is the focus of any integrated steel plant. An important role in the development of blast furnace production in the ussr has been played by m. Blast furnace taphole clay materials refractories with the prevailing trend of increasing capacities of blast furnaces the conditions for applications of taphole clay refractory materials have become more stringent as there has been a significant increase both in the pig iron temperatures and taping durations. In the latter half of the past century blast furnaces with the working volume of 86, 15, 1719, 2002, 2300, 2700, 3200, 5014, 5580 m3 were manu factured. Blast furnaces are similar to furnaces, but can smelt only ore blocks and toolsarmor made of iron, gold or chainmail. Since almost 15 years paul wurth umwelttechnik gmbh in essengermany is dedicated to bf and bof gas cleaning. Fluidity of coal blend should be at lest above 250ddpm dial divisions. It can be noted that the major share 72% of energy is required during iron making which includes coke making 12%, iron ore sintering 6%, and blast furnaces 54%. It was in the house that a had bought, my question is that he had the fire brick and grates out of it and looking at it it looks. A method of operating a blast furnace comprising two or more lances that inject reducing agents from a tuyere including injecting a solid reducing agent and a flammable reducing agent from different lances.
The typical load is 5 to 6 ton with the furnace operating for 16 to 18 hours daily. Efficient and environmentally friendly smelting reduction a vai ironmaking technology. North american blast furnaces is now about 100 billion cubic feet per year bcfy. A dryprocess dust collector for blast furnace is equipment for cleansing blast furnace gas. Blast furnace an introduction blast furnace is the focus of any integrated steel plant.
Logicalmathematical evaluation model of blastfurnace melting. This report presents available information regarding the use of aircooled blast furnace slag acbfs as coarse aggregate in concrete pavements. These aggregates increased the productivity and therefore proved the economic benefit of the blastfurnace. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Expired lifetime application number inventor ueshima kumao nakasono hiroshi. The forging furnace is used for preheating billets and ingots to attain a forge temperature. The model decision support system for control of blast furnace. So by reducing the constituents in blast furnace gas we can increase the calorific value and can be used to generate heat and rise the temperature in any furnace. For this emergency repair there was no time to reengineer the. They deliver a very large quantity of air at a pressure lower than an air compressor, but greater than a centrifugal fan. This continuous run of the blast furnace is known as campaign life. Aug 04, 2011 the purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called hot metal. In the combustion heat accumulation phase, heat energy in hot exhaust gas from a burner is accumulated in checker bricks and, in the ventilation phase, a large quantity of air is blown through the checker bricks to raise the temperature of the air.
A hot blast stove is a facility to supply hot air to a blast furnace continuously. Firstly sorry for the late at your service is a large collection of videos to fit every. In a short span of seven years, fuel injection has been expanded to 50% of the furnaces in the united states and canada and the types of fuels now include gas, fuel oils, tar, coal, and slurries on a trial basis. The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called hot metal. We continually monitor the performance of all our plant and equipment to optimise performance. Singlestage furnaces have a simple onoff switch that controls the heat theyre either running full blast or not at all. A blowing engine is a large stationary steam engine or internal combustion engine directly coupled to air pumping cylinders.
The openhearth furnace ohf uses the heat of combustion of gaseous or liquid fuels to convert a charge of scrap and liquid blast furnace iron to. As created, the improved blast furnace functions identically and at the same speed as the crude blast furnace. They are then used to help heat the air blast, required if blast furnace is to reach the high temperatures needed to produce molten iron. Primetals technologies has provided blast furnace engineering, project excellence and expertise to customers worldwide for over a century. Blowing engines are used to provide the air blast for furnaces, blast furnaces and other forms of. Proposed rule for mandatory reporting of greenhouse gases 1. Some smelters tap metal directly into a holding kettle which keeps the metal molten for refining. Improved blast furnace official feed the beast wiki. The iron ore concentrate is now mixed and ready for the pelletizing process. A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals.
Maintenance and overhaul of steam turbines wgp42 05. Pdf iron and steel making is one of the most intense energy consuming in the industrial sectors. The gas cleaning system contains two stages, the coarse cleaning system and the fine cleaning system. Your challenge the conventional blast furnace route is too costly and energyintensive to keep pace with dynamic market changes, where even short and. The following overview provides basic information necessary for a proper understanding of the problem of heat transfer. Owater channel isolated stave gets hotter oeventually furnace shell gets hot and cracks occur nonfixed connection stave moves. Pdf technological changes in blast furnace iron making. Pdf information modeling system for blast furnace control. Blast furnace simple english wikipedia, the free encyclopedia.
Pdf impact of operational parameters on fuel consumption of. The blast furnace is a huge, steel stack lined with refractory brick, where iron ore. In modern blast furnaces a campaign life of 15 years to 20 years is expected. Finally, because of the manual approach to define and combine the cycle. Blast refers to the combustion air being forced or supplied above atmospheric pressure in a blast furnace, fuel, ores, and flux are continuously supplied through the top of the furnace, while a hot blast of air sometimes with. The blast furnace is a huge, steel stack lined with refractory brick, where iron ore, coke and limestone are dumped into the top, and preheated air. Blastfurnace production article about blastfurnace. In 2009 a second partial repair was conducted in order to repair the refractory hearth lining around the tap hole. Blast furnaces are often subjected to extreme physical stress resulting in deterioration of the interior, thus requiring periodic repair.
676 1041 330 683 1183 1652 1178 20 1627 347 458 747 196 130 886 64 857 191 585 558 522 920 1454 1183 1565 1644 552 863 1216 1399 900 1077 1126 1305 220 793 680 1043 982 994 310 258 1129 1496 1138 1348 860 1318