The blast furnace bfbased ironmaking process accounts for more than 70% of. Blast furnace, coke gas and converter gas for power production. Blast furnace gas bfg is a byproduct of blast furnaces that is generated when the iron ore is reduced with coke to metallic iron. A european funded project aiming to enhance the usage of blast furnace gas. The blast furnace is a huge, steel stack lined with refractory brick, where iron ore, coke and. Blast furnaces have grown considerably in size during the twentieth century. The gas flows up to where two uptakes merge into an offtake 9. System for cleaning blastfurnace gas in the blastfurnace shop at. The process of iron and steel plant is starting from sinter plant, coke oven etc, and the. Blastfurnace gas is utilized as a fuel in metallurgical works.
At the end of the twentieth century the biggest blast furnaces had between 14 and 15 m in hearth diameter, and were producing 34 million tons of. A good burden surface shape can improve gas flow distribution. Pdf the application of a gasthermal aluminum coating to the outer surface of air lances extends their life and reduces the heat losses. At the extreme top of the uptakes there are bleeder valves 8 which may release gas and protect the top of the. Explosion characteristics of blast furnace gas article pdf available in inzynieria mineralna 191. Blast furnaces are similar to furnaces, but can smelt only ore blocks and toolsarmor made of iron, gold or chainmail.
Furnace gas is a gas which is produced in different types of furnace during the production of metals. Blast furnace gas is a byproduct of blast furnaces where iron ore is reduced with coke into metallic pig iron. The purpose of a blast furnace is to chemically reduce and physically convert iron oxides into liquid iron called hot metal. At the extreme top of the uptakes there are bleeder valves 8 which may release gas and protect the top of the furnace from sudden gas pressure surges. Solution loss and reducing power of blast furnace gas. Also at the top of the blast furnace are four uptakes 10 where the hot, dirty gas exits the furnace dome. About 53% of the total energy leaves the furnace in the liquid steel, while the remainder is lost to the slag, waste gas, and cooling.
By combining these feature quantities, the company has put into practical use an operation support system that provides operators with a quantitative index of gas. A realtime 3d measurement system for the blast furnace burden. Apart from blast furnace proper blast furnace section includes many other accessories. There is the possibility to blend this gas with other off gases and you. These reactions representing the acquisition of oxy gen from the charge. The principle of blast furnace operational technology and. Method for predicting gas channeling in blast furnace. Blast furnaces and converters are open areas of the plant.
Coinjection of natural gas and pulverized coal in the blast furnace. 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. In order to facilitate the combustion of blast furnace gas. At the extreme top of the uptakes there are bleeder valves 8 which may release gas and protect. System for cleaning blastfurnace gas in the blastfurnace shop at the vszh koshitse combine. Blast furnace it is a tall cylindrical furnace made of steel. 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. It has a very low heating value, about 93 btucubic foot 3. High levels of power requirement and rising energy costs present a major challenge to the metallurgical industry.
Blast furnace gas bfg is a byproduct of blast furnaces and is generated in huge. The blast furnace operates as a countercurrent exchange process whereas a bloomery does not. Blastfurnace gas article about blastfurnace gas by the. Sweden a blend of coke oven and blast furnace gas is. 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. When the blast is enriched with oxygen, the nitrogen content of the gas is lowered and the amount of other gases including carbon monoxide and hydrogen, as well. The rest is mostly carbon monoxide, which has a fairly low heating value already and some 2. Pdf blastfurnace lances with a gasthermal aluminum coating. Request pdf blast furnace gas based combustion systems in steel. Smelting equipment yields one iron or gold nugget from their respective materials. Sweden a blend of coke oven and blast furnace gas is used as fuel 5. Coke oven gas and blast furnace gas are utilized in various combustion.
Some furnace gases created as a free byproduct during production processes serve as an attractive fuel for power generation. I just a decade ago taptotap times had decreased from over 2 techcommentarv the international iron and steel hours to 7080 minutes for the effi cient melt shops. The heat of combustion of blastfurnace gas is approximately 3. Converter gas, which is produced whenever carbon is extracted from pig iron in the converter plant by oxidation, is around sixtyfive percent carbon monoxide. It is narrow at the top and has an arrangement for the introduction. In the early days of the twentieth century, blast furnaces had a hearth diameter of 45 m and were producing around 100,000 thm per year, mostly from lump ore and coke. Image acquisition of bf burden surface using industrial endoscope. Blast furnaces differ from bloomeries and reverberatory furnaces in that in a blast furnace, flue gas is in direct contact with the ore and iron, allowing carbon monoxide to diffuse into the ore and reduce the iron oxide to elemental iron mixed with carbon. Data acquisition system an extensive real time data system collects and stores all of the data related to the blast furnace operation. Blast furnace gas based combustion systems in steel reheating.
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