As the combustion enters molten iron, the quality of subsequent steel will be affected. Can’t you use coal directly? Relevance. The air blown into the bottom of the furnace is heated using the hot waste gases from the top. The molten iron is made using the 'thermit' reaction where iron oxide is reacted with aluminium powder. Column skeleton: The coke heap density in the blast furnace charge is the smallest, the gap is large, and the volume accounts for 35%-50% of … What is coke? Let me talk about the use of coke. The daily coal is generally referred to as coal, and the commonly used charcoal is generally charcoal. BF coke has typical size of 30 mm to 60 mm (some furnaces use BF coke of size 40 mm to 80 mm) and it constitutes a big component of the production cost of the hot metal (HM). There is currently no better alternative solution. Let me talk about the use of coke. Why use coke? The coke (essentially impure carbon) burns in the blast of hot air to form carbon dioxide - … 1 decade ago. The Blast Furnace is a multiblock structure added by Railcraft. The stack is kept full with alternating layers of coke, ore, and limestone admitted at the top during continuous operation. How A Blast Furnace Operated Stock Yard - Where raw materials were stored and kept dry. Let me talk about the use of coke. The heat source. Put the coal isolated air into the “oven” (coke oven) for high-temperature baking. Column skeleton: The coke heap density in the blast furnace charge is the smallest, the gap is large, and the volume accounts for 35%-50% of the total volume of the charge. Answer Save. Coke is relatively strong, as long as it remains blocky above the tuyere area, which enables the column to have good gas permeability and keep the furnace indirect condition. 1. Coke is relatively strong, as long as it remains blocky above the tuyere area, which enables the column to have good gas permeability and keep the furnace indirect condition. 1. Step 1 – Hot air (oxygen) reacts with the coke (carbon) to produce carbon dioxide and heat energy to heat up the furnace. Why use coke? As the temperature rises, the coal is first dehydrated and degassed, and after 300 °C, it becomes soft and oily (tar), and then the semi-finished semi-coke (also It is called Lan Tan) and it can be burned directly. 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. This structure is used to turn Iron into Steel. Q1: What? The carbon monoxide produced by its combustion reduces iron oxide (hematite) in the production of the iron product. Q3: Why? 3. Column skeleton: The coke heap density in the blast furnace charge is the smallest, the gap is large, and the volume accounts for 35%-50% of the total volume of the charge. In the blast furnace ironmaking, coke has the functions of column skeleton, reduction, carbon supply, and heat supply. The following questions are about the blast furnace and the production of iron. Blast refers to the combustion air being "forced" or supplied above atmospheric pressure. Extraction of Iron.. Chemistry of the blast furnace.. Q3: Why? Why is limestone added to a blast furnace during the extraction of iron from its ore? Where is better than coal? This can increase the proportion of coal injection, but the reduction reaction and the skeleton function still depend on coke. When it is placed in a “box” with inert gas, it is dry and quenched. Blast furnace coke rate reduces by around 2 % with the blast temperature increasing by 100 deg C. High top pressure also reduces the coke rate in the blast furnace. The high-temperature CO2 gas reacts with the carbon in the coke to form CO, and the CO further reduces the iron ore to form molten iron. The carbon monoxide then reduces the metal oxide to the metal and makes carbon dioxide. Coke is an important raw material in the smelting process of the blast furnace, accounting for about 45%. The blast furnace is perhaps the most iconic image and symbolizes the metal industry. Put the coal isolated air into the “oven” (coke oven) for high-temperature baking. The raw materials require 6 to 8 hours to descend to the bottom of the furnace where they become the final product of liquid slag and liquid iron. Others include pellets, sinter, lump ore, limestone and so on. The temperature is raised to about 1000 ° C, and the semi-coke is then matured into coke by polycondensation. In blast furnace ironmaking coal is not as strong as coke, and crushing will cause a decrease in the permeability of the blast furnace. Heating: The combustion of coke, injected fuel and external hot air provide all the heat needed for blast furnace smelting, of which coke combustion heat supply accounts for up to 75%-80%. In the blast furnace ironmaking, coke has the functions of column skeleton, reduction, carbon supply, and heat supply. Is it the same as the charcoal commonly used at home? Por la presente invitamos sinceramente... Desde el 4 de diciembre hasta diciembre... Why Use Coke for Blast Furnace Ironmaking not Use Coal Directly? Comparing the two phases, coke is not only a fuel or a raw material in the blast furnace, but the coal can replace the coke in the heating performance. 1 Answer. Carbon supply: The carbon content of pig iron is about 4%, all from blast furnace coke, accounting for 7%-9% of coke carbon content. Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace. in the form of limestone. Coke and coal are all high-heating fuels. Coke; Limestone; Air; Each of the raw materials is necessary for the production - click to see its purpose. What is coke? Reduction: The coke carbon content is above 85%. Favorite Answer. Others include pellets, sinter, lump ore, limestone and so on. Use of Nut Coke in a Blast Furnace Metallurgical coke also called blast furnace (BF) coke plays an important role in the stable operation of the BF. a) Why are hot blasts of air blown in to the blast furnace? Why Use Coke for Blast Furnace Ironmaking not Use Coal Directly? The calorific value and carbon content of some anthracite coals are higher than coke, but there are more harmful impurities such as phosphorus and sulfur in coal. The high-temperature CO2 gas reacts with the carbon in the coke to form CO, and the CO further reduces the iron ore to form molten iron. Compared with coal, coke is less water and gas, and it also separates the gas that is useful and the tar that is harmful to iron making. Heat energy is valuable, and it is important not to waste any. As the temperature rises, the coal is first dehydrated and degassed, and after 300 °C, it becomes soft and oily (tar), and then the semi-finished semi-coke (also It is called Lan Tan) and it can be burned directly. It is certainly not a new technology and can be dated back to ancient China where the same method was used on a smaller scale in the production of metals. 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. In the blast furnace ironmaking, coke has the functions of column skeleton, reduction, carbon supply, and heat supply. The reaction in the blast furnace occurs between “one liter and one drop”, that is, the rise of the gas and the drop of the charge, which requires the column to have good gas permeability so that the raw material can be fully reduced. The main products of this reaction are iron, slag and oxides of carbon. When it is placed in a “box” with inert gas, it is dry and quenched. Heating: The combustion of coke, injected fuel and external hot air provide all the heat needed for blast furnace smelting, of which coke combustion heat supply accounts for up to 75%-80%. Comparing the two phases, coke is not only a fuel or a raw material in the blast furnace, but the coal can replace the coke in the heating performance. C (s) + O 2(g) CO 2(g) . A productivity increase is achieved because less coke is required in the BF, which frees up space for more ore to be charged, and because lower slag rates can be achieved. Why is coke and not coal added to the blast furnace? The gas furnace takes No. Even some anthracites have higher calorific value than coke and are cheaper than coke. Some ash will be present, and a bit of sulfur, tar and some other residues of the coking process. The calorific value and carbon content of some anthracite coals are higher than coke, but there are more harmful impurities such as phosphorus and sulfur in coal. The furnace system is very large and involves multiple components that are very open and visible. There is currently no better alternative solution. Q1: What? The gas has a very low heating value of around 0.9kWh/Nm 3 , which on its own is typically not high enough for combustion in a gas engine. As the combustion enters molten iron, the quality of subsequent steel will be affected. Regarding coke, some people may have doubts. Extraction of Metals. It is why it is called a "blast furnace". In blast furnace ironmaking coal is not as strong as coke, and crushing will cause a decrease in the permeability of the blast furnace. be had from one furnace per day.The one gas-fired furnace takes the placeof three coke-oven furnaces formerlyused. hkk_925. Where is better than coal? The coke ignites (lights on fire) and burns. Blast Furnace Gas Blast furnace gas is a by-product of blast furnaces where iron ore is reduced with coke into metallic (pig) iron. Reduction: The coke carbon content is above 85%. The iron oxides in the ore are chemically reduced … In the blast furnace, it is so hot that carbon monoxide can be used, in place of carbon, to reduce the iron(III) oxide: iron(III) oxide + carbon monoxide → iron + carbon dioxide With every increase of top pressure of the blast furnace by 0.1 kg/sq cm there is a reduction of around 0.1 % in the coke rate. The blast furnace. Air causes the coke to burn, raising temperatures to 1,700 degrees Celsius, which oxidizes impurities. The iron ore, coke and limestone ("charge") is fed into the blast furnace from the top. This can increase the proportion of coal injection, but the reduction reaction and the skeleton function still depend on coke. Even some anthracites have higher calorific value than coke and are cheaper than coke. Coke comes out of the “oven”. Why does the blast furnace not use coal directly? The process reduces the carbon content by 90 percent and results in a molten iron known as hot metal. The Redcar blast furnace, South Bank Coke Ovens and Dorman Long Tower on Teesside are due to be dismantled to make way for new developments. Can’t you use coal directly? In blast furnace ironmaking, coal is not as strong as coke, and crushing will cause a decrease in the permeability of the blast furnace. Several reactions take place before the iron is finally produced. This creates carbon monoxide because there is not enough oxygen to make carbon dioxide. Coke comes out of the “oven”. Charge - Charging the furnace meant layering it with iron ore, limestone, and charcoal (or coke), … Tees Valley Mayor Ben … In the blast furnace ironmaking, coke has the functions of column skeleton, reduction, carbon supply, and heat supply. When the water is “sprayed”, the water is quenched. Why does the blast furnace not use coal directly? Coke is an important raw material in the smelting process of the blast furnace, accounting for about 45%. Well I have my Chemistry paper in 4 days so i … Charging House - Where the furnace is "charged" (loaded full of materials). Generally speaking, coke is the product of coal purification. (1 mark) b) Why is limestone added to the blast furnace? () Pacific service magazine . When the water is “sprayed”, the water is quenched. Coke and coal are all high-heating fuels. This is added to the blast furnace along with coke, a form of carbon, and calcium carbonate. Once inside the hot furnace the coke reacts with the blast of … Regarding coke, some people may have doubts. 3. The reason of coke used in blast furnace steelmaking:Coke is the product after the desulfurization of coal, because the removal of sulfur in coal, coal tar and other harmful substances, no longer in the process of steelmaking, the impact on the quality of steel, the formation of unnecessary ingredients. According to steel.nic.in; Coke Rate is measured in Kgs of BF Coke consumed per tonne of Hot Metal produced in the Blast Furnace (Kg/THM). Productivity gains from charging more scrap will be sought by steelmakers with latent BOF capacity, during periods of high margins or when capacity is restricted for environmental reasons, as seen in China in recent years. In a blast furnace, fuel, ores, and flux are continuously supplied through the top of the furnace, while a hot blast of air is blown into the lower section of the furnace through a series of pipes called tuyeres, so that the chemical reactions take pl Generally speaking, coke is the product of coal purification. May 9, 2017 The temperature is raised to about 1000 ° C, and the semi-coke is then matured into coke by polycondensation. The daily coal is generally referred to as coal, and the commonly used charcoal is generally charcoal. Is it the same as the charcoal commonly used at home? The Blast Furnace. The Blast Furnace will only take Coal Coke, Charcoal, and Thaumcraft Alumentum as fuels, requiring 1 Coal Coke per Ingot, 0.5 Alumentum per Ingot, 2 Coal per Ingot, or 4 Charcoal per Ingot. Hot air is blasted into the furnace causing coke (carbon) to burn rapidly producing carbon dioxide and raising the temperature to 2000 °C.. carbon + oxygen carbon dioxide + heat. Hot air is blasted through the bottom. Hot air is blasted into the blast furnace to burn the coke (a cheap form of carbon) added to form carbon dioxide. The reaction in the blast furnace occurs between “one liter and one drop”, that is, the rise of the gas and the drop of the charge, which requires the column to have good gas permeability so that the raw material can be fully reduced. Carbon supply: The carbon content of pig iron is about 4%, all from blast furnace coke, accounting for 7%-9% of coke carbon content. The coke in the charge of blast furnace Supplies heat to reduce ore and melt the iron The coke is a source of carbon monoxide which will reduce the iron oxide in the ore to iron and the carbon monoxide oxidizes to carbon dioxide. The calorific value and carbon content of some anthracite coals are higher than coke, but there are more harmful impurities such as phosphorus and sulfur in coal. (1 mark) c) Railway lines are welded together using molten iron. The coke we put in blast furnaces to produce iron is almost all carbon. Continuous Rolling, Semi-continuous and Slit Rolling Processes of Rolling Mills, Add: NO.67, Gaoxin Road, Xi’an 710075, Shaanxi Province, China. Construction [edit | edit source] A blast furnace is fed with coke, iron ore and fluxes, and hot air is blown into the mixture. Compared with coal, coke is less water and gas, and it also separates the gas that is useful and the tar that is harmful to iron making. 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