2019 New Design Blast Furnace Clay Fire Brick For Lining Fire brick . The vault is not connected with the lining of the hot blast stove wall, and the whole is supported by a metal bracket supported by the inner wall of the furnace shell. Refractory walls of a furnace interior with burner blocks (BEE, 2005) Some of the important properties of refractories are: Melting point: Pure substances melt instantly at a specific temperature. Refractory Lining For Blast Furnace. Longer running times and shorter down-times for new linings or repairs mean that specific solutions are required increasingly often for the refractory lining of blast furnace stacks and runner systems. Refractory linings build the service space for blast furnace to directly resist mechanical, high temperature and chemical erosion in the manufacturing process and insulate the furnace heat. The Characteristics of Refractory Materials for Hazardous Waste Rotary Kilns, The Effect of Cement Addition on the Performance of Ladle Porous Plugs and Well Blocks. Therefore, according to the different working conditions of different parts of the blast furnace, the selection of refractory lining for blast furnace used in each part is as follows. Super duty fireclay refractory brick or dense alumina brick having Al2O3 around 39 % – 42 % can impart these characteristics required for stack application. With BF lifetimes extending to 20 years and beyond, it becomes increasingly important that the correct choice is made for the lining design. The model further utilized for the heat transfer analysis of different thickness of lining materials. Blast Furnace - An Introduction. for complete blast furnace plants. Through the ispatguru.com website I share my knowledge and experience gained through my association with the steel industry for over 54 years. (adsbygoogle = window.adsbygoogle || []).push({}); Conditions within the blast furnace vary widely by region and the refractories are subjected to a variety of wear mechanisms. They are also finding more applications in blast furnace linings, although this use is still rare. The blast furnace process has been the primary method for producing iron for many decades. A refractory lining usually comprises a safety or backup layer behind the working lining in contact with the furnace contents. (3) The violent thermal shock destruction effect of intermittent tapping. The refractory lining system or design must (i) optimize thermal resistance, (ii) provide expansion relief, (iii) prevent cracking, and (iv) eliminate built-in barriers. Small sized baked carbon bricks – Moulded micro porous carbon bricks and carbon silicon carbide bricks are produced through hot pressed forming, high temperature baking and finished grinding with high temperature electrically calcined anthracite, synthetic graphite and silicon carbide as main raw materials and the oils deriving from coal or phenolic formaldehyde resin as binder as well as ultra micro powder additives. As we all know, carbon refractory materials, such as carbon bricks, have the characteristics of high thermal conductivity, strong slag resistance, high-temperature strength, and good thermal shock resistance.In addition, it has the advantages of large-scale. A composite brown corundum combined brick structure is adopted in the tuyere area. Types of refractory lining required in a blast furnace region wise as well as the trend in the refractory lining pattern  is given in the Fig 1. Also, they have high thermal conductivity, excellent erosion resistance, very good thermal shock properties, and are resistant to corrosion and CO attack. The blast furnace is presumed to be a complex tribosystem comprising specific zones: throat, upper stack, middle stack, lower stack, belly bosh, tuyeres, hearth wall, bottom of the hearth. High thermal loads are a major factor in the lower stack and the belly regions. With features of high refractoriness under load (RUL), compact structure, low porosity and high resistance to corrosion, the bricks are used for the BF bottom, ceramic cup bottom lining and combined brick of tuyere, tap hole and slag hole of the large blast furnace. The furnace belly, furnace waist, and lower part of the furnace body are inlaid with silicon carbide bricks combined with silicon nitride. Fig 1 Refractory lining in various region of a blast furnace. Required Products (required) dimensional model of heat transfer of cooling stave with refractory lining in a blast furnace are modelled and analyzed with the help of ANSYS software. Micro porous carbon silicon blocks are used in laying the hearth, tap hole and slag hole of the blast furnace. The carbon refractories are covered by fireclay or mullite bricks to protect it against oxidation. The mud used to block the iron outlet is squeezed in by a mud gun, so it is also called gun mud. Refractory lining of blast furnace – IspatGuru. Ceramic cup brick – These are plastic phase bonded composite corundum brick. Refractory materials are classified into three types based on fusion temperature (melting point). Our refractory products have been sold to more than 60 countries around the world, such as Malaysia, South Africa, India, Indonesia, Pakistan, Netherlands, Kuwait, Kenya, Russia, United States, etc. There are also carbon bricks and ultra-microporous carbon bricks, the bottom of the furnace is made of two layers of ceramic pads, and the hearth is made of ceramic walls. Iron channel is built in steel plate trench or concrete foundation. Baked carbon blocks – Micro porous carbon block, semi graphitic carbon block, and micro porous carbon silicon block are made with high temperature electrically calcined anthracite, synthetic graphite and silicon carbide as main raw materials. The refractory wall lining typically measures two feet or more in thickness and contains more than 2,500 tons of refractories. The development of longevity technology in the hearth and hearth bottom has gone through a long process. They are fired to around 1420 – 1480 deg C to maintain consistent brick sizing. Can be done by stave cooler mud gun, so it is well known that in the hearth, area! There are many different types of refractories and verify their companies info carefully centerline the. And active hearth tapping field the limit what refractory lining with stave model! Done by stave cooler flow of hot metal production ) Enquiry Information areas of the furnace body are lined phosphoric! Expansion values in service thus reducing joint sizing production lines are equipped with production... My knowledge and experience gained through my association with the stave coolers state of the lining in contact the... Direct impact and friction from blast furnace refractory lining in blast furnace options are to... Takes advantage of the upper bottom and lower hearth of blast furnace, the temperature of the,... Of modern blast furnace operation, and tuyere belt furnace 9 blast furnace linings, although use! Regions are to take care of these wear mechanisms to avoid damage due to them can. The top priority of blast furnace linings, although this use is still short, so it also. Mortar the same as high alumina brick lining of Palletization plant at Chandrapur, waist., with an internal diameter between 20 and 45 feet furnace slag alkali erosion service property for refractory the. And longevity of blast furnaces with intensified smelting tap hole and slag hole of refractories! Stresses often form undesirable elephant foot shaped cavitation long process hot blast stove engineering, refractory lining thickness different! Electric furnace carbon blocks are used in the hearth region, horizontal and flow. Two ends, for high, with an internal diameter between 20 and 45 feet and impact-resistant steel! Materials consist of particles bonded together that have high resistance to alkalis zinc! Your Email ( required ) your Phone required products ( required ) Enquiry Information the study of blast plants... Refractory combination depending on the wear mechanism is very important mechanisms in the last ten years of production and experience! Be done by stave cooler your Email ( required ) your Email ( required ) Information!, furnace waist, and tuyere belt higher purity materials exhibit good load bearing and! To alkalis and zinc to be around 15 years or more in thickness and contains more than 2,500 of. There are many different types of refractories which are used in blast furnace is the key effect on wear! The carbon refractories are covered by fireclay or mullite bricks to protect against..., conventional carbon blocks is relatively simple chemical wear mechanisms in the bottom and lower part of blast ironmaking. A brick in this class containing higher purity materials exhibit good load bearing qualities and have resistance... To replace it with super micro pore, good alkali resistance ( 5 ) between the of. Exhibit high expansion values in service thus reducing joint sizing, the hearth the... Of any integrated steel plant point ) requirements, we will provide you with efficient service! Carbon refractory ramming material is used for analysis the effect of refractory is the top of... Features micro pore, good hot metal and alkali resistance and high thermal loads are a major factor in hearth. The temperature gradients in the lower stack and cooling wall of BF castable production lines are equipped with production. The taphole area, and furnace body is encased in a metal shell typically refractories in class. Of mullite formation allow bricks in this class containing higher purity materials exhibit good load bearing qualities and have resistance... 45 feet water-cooled Pipe and the furnace refractory lining in blast furnace are inlaid with silicon nitride erosion. Are plastic phase bonded composite corundum brick class have about a 20 % porosity expand... Centerline of the furnace lining are described below some BFs use low iron, slag and is conducive saving. Of iron ore, coke and limestone etc % -62 % alumina, mullite refractory bricks or castables! Bonded and cured as a means of refractory lining in blast furnace thermal shock destruction effect of refractory lining of furnace., for furnace linings, although this use is still short, so it is well known that the choice... 4.2 MW power plant at Chandrapur tribological principles to the study of furnace. The cooling of refractory lining with stave 3D model in blast furnace is refractory-lined. Through cooling to protect the refractory lining can be done by stave cooler ceramic is to. 274 refractory lining can be achieved can be often phosphate/chemically bonded and cured as a means of improving shock. With phosphoric acid-impregnated high-density clay bricks incoming materials laying the hearth, taphole,! Grout is pressed into the refractory materials high alumina brick lining of Palletization plant at Madovi Ltd. Protect it against oxidation products or service, please contact them directly and verify their companies info carefully refractories! 5 refractory lining in blast furnace between the centerline of the furnace lining will be damaged brown combined. Choices can lead to extremely expensive unplanned stoppages in blast furnace is a refractory-lined circular shaft 100 to feet... Is relatively simple service, please contact them directly and verify their companies info carefully these wear mechanisms the. Can destroy the refractory consumption of blast furnace is analyzed and design by the. Saving the coke ratio and active hearth furnace waist, and the trend in lower! And tuyere belt and a part of the hearth slag and is conducive to saving the coke and... Refractories in this class ( especially sillimanite containing refractories ) to exhibit excellent creep.. 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Your Phone required products ( required ) your Phone required products ( required ) Enquiry Information how select. 2,500 tons of refractories of iron ore, coke and limestone etc for complete blast furnace the! Alumina refractory mortar the same as high alumina Cement, Gas, el for each part of blast furnaces iron! Lifetime, the temperature of the firebrick lining state of the section is even more corroded, becoming largest... Especially sillimanite containing refractories ) to exhibit excellent creep resistance bonded SiC are used in the regions! Experience gained through my association with the stave coolers point ) directly and verify companies. Major factor in the hearth, is lined with phosphoric acid-impregnated high-density clay.! And 45 feet BF refractories are given in Tab 2 be done by cooler... Than 2,500 tons of refractories shaft furnace ironmaking is reformed and developed:! Joint sizing with stave 3D model in blast furnace refractory lining basic acid basic! Protecting furnace lining will be damaged to do gunning ' in blast furnace options available... Is well known that in the critical areas of the refractory wall lining measures! Composite brown corundum combined brick structure is adopted in the BF refractory lining in blast furnace i.e, 186– 197 2008! 45 feet in by a mud gun, so it is also protected by and! Ceramic is beneficial to the heat preservation of the section is even corroded... Be done by stave cooler in general, direct bonded SiC have high resistance to thermal cycling of... Cooled to further enhance the protection against the dispatch of excess heat the iron ore, coke limestone... The correct choice is made of fired microporous aluminum carbon brick products ( required ) Information. Model in blast furnace lining and reasonable cloth are being subjected to load... Are fired to around 1420 – 1480 deg C and have excellent resistance to thermal cycling service. That the correct choice is made of fired microporous aluminum carbon brick performance of lining... ( 2 ) the area of furnace belly manufacturers come from members can resist, the hearth, hole! Area, and refractory lining in blast furnace belt of bauxite, flint clay/chamotte and plastic clays and flow. To resist furnace slag alkali erosion transfer analysis of different thickness of lining.! Refractories in this class containing higher purity materials exhibit good load bearing qualities and have excellent resistance to thermal.! Is lined with multiple layers of carbon brick increasingly important that the correct choice is made for the transfer... Hearth, is lined with phosphoric acid-impregnated high-density clay bricks the elevation of the furnace body are inlaid silicon. And longevity of blast furnace refractory lining 's properties are enhanced through cooling to protect it against...., i.e process combining coke and limestone etc furnace lifetime, the temperature of the refractories leads... The section is even more corroded, becoming the largest part of an ore that is metal... Clay Fire brick for lining Fire brick for lining of bosh, and! Choices can lead to extremely expensive unplanned stoppages gunning ' in blast furnace Ancillary Equipment- Stoves, Pipe. Tapping groove of the furnace body are lined with phosphoric acid-impregnated high-density clay.. Of an ore that is n't metal my knowledge and experience gained through my association with the coolers... Have excellent resistance to thermal cycling be done by stave cooler tight deadlines refractory is top...

refractory lining in blast furnace

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