The challenge for BOF operations at Meishan is the hot metal Phosphorus content, as shown in Figure 2 on the right side. Author information Keywords: 3D laser scan, data registration, ICP, blast furnace. Both carbon-bonded and synthetic resin-bonded bricks are offered as required. Furnace Lining Products, Modules. The objective was to study how an infrared camera can be used for condition monitoring of converters in the steel industry and the conditions under which thermal scanning can be used to estimate wear of a converter's refractory lining. It has to be blown down in the BOF process to a level 0.017% in average to safely meet the specification of 0.020% in a single slag process. Slag splashing Splashing of slag to coat the refractory lining has become a standard practice to increase the lining life. The barrel safety lining is usually 9" in thickness. The refractory lining of the converter consists of an inner safety lining and outer working lining. Vesuvius BOF maintenances solutions. McKeown offers turnkey services for AOD vessel with quality refractory products, and on site technical servies to optimize the AOD OPERATION. What is the thickness of refractory lining in BOF? ments, the residual brick thickness of the refractory ... the refractory lining from all perspectives. The ... narrow BOF shops. Composition. In a converter lining usually two layers of refractory bricks are used. The most important task in refractory management is always to assure safe practice in ladle operation. Engicon In Brief; Ownership & Management They are typically composed of oxides or non oxides like carbides, nitrides etc. A very common design for the slag line is Mag-C bricks of 300 mm to 450 mm in thickness and with 10 % to 20 % of C content. A refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Optimized Lining for BOF RHI Magnesita provides lining concepts which are suited to the customer-specific converter operation and process conditions. ANTERIS 300 series (300s, 300r, 300c, 300dm, 300g) covers a wide range of possible applications defined by the existing layout. The safety lining in the BOF / Q-BOP is typically tasked to perform a single campaign potentially coving many years. Welcome To Vision Engicons; +91-612 - 2250295; info@visionengicons.com; Home; About Us. Description: Nelson S7X refractory studs are used to secure castable or gunite linings of light to medium density material (up to 90 lb. These temperature levels are probable in BOF during production process. Fluid Catalytic Cracking Units Refractory Solutions. • In 1998, Harbison-Walker acquired A.P. With this world premiere, Ferrotron introduced a laser profile measurement system that makes a contactless measurement of the refractory lining of a hot torpedo ladle in less than three minutes. Length: 1.12 inch. The lining of the furnace is mostly alkaline, like a straight bucket. • The O 2 lance is lowered and high pressure N 2 is used to splash molten slag on the walls of BOS vessels for a period of 2 to 4 min. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface. There was set schedule of wear mechanism of refractory lining based on literature and consider with temperatures in range 1300 °C to 1700°C. Each torpedo ladle is lined with Alumina-Silicon Carbide-Carbon refractories. In the process of steelmaking in converter, due to the impact of molten iron and scrap on the lining, the scouring of the lining in the smelting of molten steel and slag, and the chemical erosion of the slag to the lining, the converter lining will be damaged to varying degrees during use. The oxygen top blown converter (Basic Oxygen Furnaces) is blown by industrial pure oxygen furnace. This paper is based on a research project carried out during 1997. LMM GROUP supply total solution for linning of EAF/BOF/ladle, tundish etc. Most refractory materials The lining is gradually thinned. from raw material selection, refractory portofio & optimization, installation & services & recycle of used refractories on site to further reduce client’s Opex & Capex in refractory consumption … Both methods are presently in use. The top blown basic oxygen furnace is equipped with the water cooled oxygen for blowing oxygen into the melt through 4-6 nozzles. High-temperature kilns firing products such as technical ceramics and other specialty materials require refractory linings that offer durability and stability at high operating temperatures. High density of scanning points, which reflects the thickness status of BOF lining precisely. 2600°F / 1430°C. The refractory properties of the torpedo ladle wall, the locations, and the depth of EMF sensors are shown in Figure4A, where the “a” has two sensors at 32 and 44 mm depths, respectively, and the depth of the other sensors is 32 mm. 2. If this measured surface is compared to the former mea-sured safety lining (reference), the current thickness of the wear lining is maintained. The apparatus is mounted on a portable cart which can be wheeled into close proximity with the open top (5) of a horizontally disposed furnace vessel (1). Highest campaign lifetime levels … Since the gunned repair material is dense and fused directly on the hot surface excellent results on life of lining is obtained in LD converter. Oxygen flow commonly reaches 200-280 ft3/ (min*t) (6-8 m3/ (min*t)). While replacing slag zone The oxygen is injected into the surface of metal liquid by the water-cooled nozzle at the top of the furnace at a high speed of Mach 3/h. While, the VESUVIUS supplies products, equipment and services for BOF Gunning Maintenance are BASIGUN Gunning Products, Gunning Equipment and Shooters and Laser System for reading lining thickness. Cone safety linings can be 6-9" in total thickness using standard key shapes or special parallelogram shapes to provide better fit. Refractory lining of a furnace arch (BEE, 2005) Figure 2b. BOF refractories Refractory for secondary steelmaking Refractory for continuous casting ... Converter is lined with a permanent lining and above it there is a wear lining. Dense refractory … 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. The EAF is a refractory-lined vessel with a retractable cover through which large graphite electrodes are lowered once the scrap has been charged and the furnace top closed. BOF heat sizes in the U.S. are typically around 250 tons, and tap-to-tap times are about 40 minutes, of which 50% is “blowing time”. Service life of oxygen lance is about 400 heats. Bricking Machine offers a combination of reliable, efficient, safer and quicker refractory installation for rotary kiln. Oxygen flow commonly reaches 200-280 ft3/ (min*t) (6-8 m3/ (min*t)). Lining thickness (first day as BOF 1 for desilicication, 1966th heats). Some details that are needed for developing the optimum refractories practices are provided in the following sections. Permanent lining thickness may va ry from 100mm to 120mm and is made of chrome -magnesite permanent lining which is given on Today a 3D-Laser Profi le Measurement System is a standard tool for reliable inspection in most steel making facilities. HOME; LOCATIONS. Various refractory bricks in different sizes and shapes are now available for diverse applications. The bricking machine is customized for rotary kilns of diameter 2.80 to 7.50 meters. - I mean exposed length after any refractory lining erosion ot thinning, not the protruding length of the thermocouple into the furnace if any. The LCS uses a suite of sensors capable of measuring the remaining lining thickness in vessels used to produce and refine molten metal. Failure of refractory. These slags are required to remove phosphorus and sulfur from the molten charge. from the bottom to the metal level was felt to be important to improve the ladle lining life because the total ladle life depends on the performance of this zone. The article pursues the analysis of balance thickness of the magnesium-carbon refractory lining of basic oxygen furnace during the campaign. The steel shell is first lined with approximately 20–25 cm of magnesia bricks containing up to 97% MgO. Benefits of Vesuvius BOF maintenance solutions. Table 2 : BOF Operating parameters 2 Furnace Operation 3 Furnace operation BOF 1 BOF 2 BOF 1 BOF 2 BOF 3 Number Of Casts 18 17 14 7 17 End Point C avg 0.03 0.04 0.04 0.04 0.04 End Point O2 avg 536 532 856 713 906 Slag TFe avg 15.4 15.5 21.9 17.2 20.9 Slag MgO avg 8.2 8.7 6.6 8.0 7.0 A laser transmitter directs a laser light beam toward the furnace lining. The article pursues the analysis of balance thickness of the magnesium-carbon refractory lining of basic oxygen furnace during the campaign. exposed length must be around 100 mm.. why would that be important. Estimated Temperature. entire surface of the refractory lining. BOF vessels can range from 90 to 300 tons. regard to the basic oxygen furnace (BOF) based steelmaking route, there are three 300 t and two 250 t ... products, slag entrapment or broken refractory lining bricks. Table 2 : BOF Operating parameters 2 Furnace Operation 3 Furnace operation BOF 1 BOF 2 BOF 1 BOF 2 BOF 3 Number Of Casts 18 17 14 7 17 End Point C avg 0.03 0.04 0.04 0.04 0.04 End Point O2 avg 536 532 856 713 906 Slag TFe avg 15.4 15.5 21.9 17.2 20.9 Slag MgO avg 8.2 8.7 6.6 8.0 7.0 original thickness of 110 mm. This safety lining is protected by a thicker layer, 25–60 cm, of monolithic magnesite that acts as the working layer. Common working lining brands are Nuline 12XF and Nuline 12XWB. RCF (refractory ceramic fiber) Chemistry. Figure 6. Examples of 3D evaluation pictures colors represent refractory lining thickness. Inspection repair andor replacement are to be accomplished during the campaign from MATH 100 at Universitas Gajah Mada Furthermore, the surface temperature of the lining is also supplied by the measuring system in the same resolution as the residual brick thickness. The blast furnace is a refractory-lined circular shaft 100 to 200 feet high, with an internal diameter between 20 and 45 feet. Presentation of Measurement Results: 3D presentation of the measured lining surface Lining thickness indicated by colour Calculated bath level displayed as a surface ... BOF’s and ladles. The LCS uses a suite of sensors capable of measuring the remaining lining thickness in vessels used to produce and refine molten metal. Lining. Measurements are initiated with a single tap to the fan less computer's 15" touch screen. The refractory at the hearth of the furnace consists of two layers. Permanent lining thickness may vary from 100 mm to 120 mm and is made of chrome-magnesite permanent lining which is given on the full height of the BOF. The thickness of refractory cement lining should preferably be between 40 … It is used on the lining of petroleum and petrochemical process industry furnaces, heaters, stacks, breechings, and in other. Lining thickness (before being BOF 1 for desilicication, 1908th heats). Portable inspection apparatus for determining the actual remaining thickness of the lining of a BOF vessel. Argon oxygen decarburization (AOD) is a process primarily used in production of stainless steel and other high grade alloys such as silicon steels, tool steels, nickel-base alloys and cobalt-base alloys with oxidizable elements such as chromium and aluminum. Ceramic Kilns. Photo of refractory brick. AOD was invented in 1954 by the Lindé division of The Union Carbide Corporation, which became Praxair in 1992. HarbisonWalker International supplies refractory materials for both tunnel kilns and periodic kilns for these applications. Basic oxygen furnace steelmaking accounts for the rest. With this world premiere, Ferrotron introduced a laser profile measurement system that makes a contactless measurement of the refractory lining of a hot torpedo ladle in less than three minutes. Hence, “hot spots” and possible iron penetrations can be shown (Figure 6). What is the thickness of refractory lining in BOF? The oxygen pressure is 150-220 psi. Inside the ladle there is usually a 60-millimetre-thick refractory safety lining next to the shell. The working lining, that part contacting the steel and slag, is 180 to 300 millimetres thick, depending on ladle size and location in the ladle. Alibaba.com offers 2,181 lining paper thickness products. The life of BOF refractory can vary greatly depending on factory practices. Measurement of Blast Furnace Refractory Lining Thickness with a 3D Laser Scanning Device and Image Registration Method. HarbisonWalker International addresses the increasing demand for transportation fuel with advanced refractory solutions that increase production efficiency, improve total performance, and expand unit reliability in the harsh conditions of an oil refinery. 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