On the thermal behavior of the slab in a reheating furnace. This production line adopts the most advanced and reliable atmosphere control technique. Before a slab is rolled to a final product thickness, it is heated up in a furnace to approximately 1500 k with a temperature gradient inside the slab below 50 km. The product is moved through the walking beam type reheating furnace via a series of walking cycles lift, traverse, lower and returns. The material is gradually fed through the furnace with the help of the water cooled beams which lift. Mathematical modeling and robust control for beam reheating. Achieving a targeted bulk slab temperature with good uniformity along the slab length and. According to the large beam reheating furnace widely used in metallurgy area, the mathematical model was built basing on the heat transfer. The patented beam transport system is designed with high stacking capability for processing heavy loads. Soaking zone has 10 burners type nxb125 temperature of each zones are different according to function.
Reheating furnace is an essential facility of a rod mill plant where a billet is heated to the required. Energy saving and environmental impact decreasing in a. Walking hearth furnace, walking beam furnace, aluminium. However the models for heat transfer phenomena are generally valid and may only need a minor adaptation for use at other reheating processes. The type of furnace could be pusher, walking hearth or walking beam either top fired or top and bottom fired. The temperature in a walking beam furnace can normally reach up to 1,200c. Our walking beam furnace design combines the latest advancements in hot rider and skid system technology, process control and level 2 automation as well as advanced burner technology. The hearth strength of large walking beam reheating furnaces can reach 800kgm2 h. A 3d unsteady numerical simulation of a reheating furnace was performed to obtain the optimal slab residence time for a walking beam type reheating furnace in ref. In double walking beam furnaces, the material is heated to temperatures of up to 1,150 c. Btu also offers global support and upgrade capabilities to enhance performance of walking beam furnace systems in the field. Energy saving and environmental impact decreasing in a walking beam reheating furnace c. Reheating furnace is the heart of any hot rolling mill where in the charge is heated to rolling temperature. One recuperative zone, one active zone with a length sized to heat the products at the discharging temperature at the maximum output, and a discharging zone separated by a wall from active zone at the exit of the furnace.
Modeling of steel slab reheating process in a walking beam. Implementation of models for reheating processes in. Reheating furnace represents a yield loss of steel. China walking beam reheating furnace china furnace. Beams arms seals biconic roll beams, columns, seals, rolls, arms for heat treatment furnaces of seamless carbon alloyed steel tubes plants. Manufacturer of walking beam hardening furnace tube heating for srmill, hardening and tempering of oil country pipes, leaf spring heat treatment and leaf spring end heating furnace for parabolic spring offered by seco warwick allied private limited, navi mumbai, maharashtra. Reheating furnaces are used in hot rolling mills to heat the steel stock billets, blooms or slabs to the rolling temperatures. It is very popular among large sized steel pipe manufacturing corporations, as the industrial process equipment can be used in combination with other types of internationaladvanced heat treating equipment to offer a complete heat treatment solution. With more than 145 years of expertise in thermal applications, fives offers flexible reheating solutions that can be customized according to the application. The base of the suspension systems is made of spring steel and needs to be heated in a walking beam furnace in order to obtain its characteristic shape. Nonlinear model predictive control of walking beam furnaces.
China walking beam reheating furnace china heating. Ultralownox flexytech technology will be used to achieve outstanding results in performance, including very low values in terms of nox emissions and low fuel consumption. There are many different reheat furnace designs, including the most common and comprehensive type, the walking beam furnace, as well as the walking hearth furnace, the rotary hearth furnace, the pushertype furnace, and the batchtype furnace. Re heating furnace are used for reheating of billets. Energy saving in walking beam furnaces by a new concept. According to its different structure, there are walking beam type, walking bottom type, walking beam type and bottom combined heating.
Construction of our new walking beam furnace at the hot strip mill. Walking beam reheating furnaces advantages hot rolling. These walking beam reheating furnace is make up with moving parts and basic fixed part. Energy saving in walking beam furnaces by a new concept for skid pipe insulation by jens heinlein, heiko siefkes, michael springer, frank hugel, andreas buhr, rainer kockegeylorenz increasing energy costs and targets for the reduction of co 2 emissions provide a constant challenge for all high tempera. General walking beam and walking hearth furnace systems. C under precisely controlled temperature and atmospheric conditions, in a full range of oxidizing and reducing atmospheres. The yield loss in reheating operation varies from 1. The main goal of these furnaces is to ensure a uniform billets heating so that. The construction of any reheating furnace has several solutions, by either adopting the classical brick lining, or combination with monolithic materials. Top and bottom fired, the walking beam furnace is highly suitable for high. We offer a wide variety of furnaces for hot rolling steel billets, ingots, slabs and blooms, and cold rolling strip coils and wire rod coils. Charging may be done as cold charging or hot charging.
Jan 20, 20 skew rolling mill production line with walk beam furnace duration. Reheating furnace mainly used for heating the billets in rolling mill line. In this paper, a comprehensive twodimensional 2d numerical heat transfer model for slab reheating in a walking beam furnace was developed using the. The size of the furnace will make it one of the largest walking beam. The walking beam reheating furnace consists of a heating furnace body, a cooling system, a combustion system, an inlet and outlet, a smoke exhaust system, a preheating recovery system, and an automatic control system. Cold rolling mechanical properties and surface quality. There are different structural of furnace such as walking beam type, stepping bottom type and walking beam, bottom combinedtype heating furnace.
This continues until the stock reaches the exit, when the revolving. The project was so suc cessful that six furnaces were built between 2005 and 2008. Achieving a targeted bulk slab temperature with good uniformity along the slab length and through. Walking beam type reheating furnace manufacturer exporter. Usa has recently been contracted by nlmk group to design and supply a 395 metric tonshour walking beam furnace for reheating slabs at its sharon, pennsylvania plant. Stein reheating walking beam furnace wbf is heavyduty equipment, customized to requirements. Energy consumption reheating furnace regenerative burners. This equipment is tailored to customer requirements to offer the optimum solution for your application. The walking beam furnace with our delicate design has occupied around 75% share in domestic market. Reheat furnace designed for blast furnace gas exclu sively, as. The goods which are to be heated are moved inside a walking beam furnace. Temperature control for reheating furnace walking hearth. The john cockerill reheating furnace standardises the thermal gradient of metal sheets, blooms and billets by optimising heat transfer on the surface of the steel, allowing for extreme temperature uniformity whilst preventing the formation. Problems of reheating furnaces in a reheating furnace pusher type the severity of operational conditions.
Optimum residence time analysis for a walking beam type. On account of its long tradition and experience, andritz maerz is one of the leading suppliers of engineering, knowhow, and process technology to the reheating, heat treatment, melting, and refining sectors of the steel and copper industry. The furnace is capable of reheating about 800 tons of steel to 2,400 degrees f per hour. A coupled numerical study was done in 1 to model a whole furnace in 3d where the authors reported that the numerical results agree reasonably well with the measurements, however disagreement was noticed for the slab surface temperature in the preheating zone. Measurement o f purdue university calumet 2200 169th street, hammond, in 46323 2199892765 the problem the reheating of steel slabs is a widely used process in steel mills and is aimed at elevating the slab temperature. Reheating furnaces tenova is a world leader in reheat furnaces for the ferrous and nonferrous metals industry. The installation techniques are various depending on materials used, i. Fives received an order from celsa group, a manufacturer of steel long products based in spain, for a walkingbeam furnace. Walking beam reheating furnace is widely used in mechanized hearth furnace, and is the main type of furnace to replace pusher furnace the bottom of the walking beam reheating furnace is basically composed of movable part and fixed part. Considering the uncertain and nonlinear characteristics existing in the system, the robust stabilization problem of the system is investigated basing on lyapunov stability theory and linear matrix inequality lmi method. Reheating furnaces soaking zone hearth refractoriesa. A this motion can be accomplished in several ways utilizing hydraulic or electro.
Alloy, chain conveyor type coating furnace and so on. Walking hearth furnace article about walking hearth furnace. This also normally results in shorter heating time and shorter length of the furnace itself apart from operational flexibility. The units, both end or sidedischarging, are either walking beam type or pusher type having stationery hearths with top and bottom burners. Top and bottomfired walkingbeam furnaces ensure high production rates and excellent quality steel grades. Apr 29, 2016 construction of our new walking beam furnace at the hot strip mill. Classification, general fuel economy measures in furnaces, excess air, heat distribution, temperature control, draft control, waste heat recovery. The charge could be in the form of billets, blooms, slabs or ingots. Walking beam furnaces belong to industry furnace group with a high energy consumption before rolling processes. Factors which contributes to low heat efficiency of the reheating furnace include i the capacity of the furnace not matched with the rolling mill capacity, ii inappropriate equipment used for the combustion, iii non provision of recuperators or recuperators with. Reheating furnaces for metal sheets, billets and blooms. The furnace, which has a capacity of 120 tons per hour, will reheat billets of different sections and lengths to serve a new rolling mill that.
Walking beam furnaces are the most advanced type of furnaces for the reheating of heavy and thick products. Walking beam furnaces are used for heating slabs, billets, or rods prior to the rolling process. Usually the blank face is bigger than i 120x120i mm2 use walking beam reheating furnace. Walking beam controlled atmosphere furnace btus walking beam is a high temperature thermal processing system that provides continuous temperatures up to 1800. Typical applications include high temperature metal. Tenova core designs and supplies reheat furnaces for a variety of applications. Walking beam furnaces for long products tenova has installed some of the worlds largest walking beam reheating furnaces for a variety of applications. However, a full industrial scale threedimensional 3d simulation of a slab reheating furnace, while comprehensive, is not an efficient way to conduct broad studies of the slab heating process. Find details of companies offering walking beam furnaces at best price. Furnace tubes and pipes chamber furnace bars see pages 1617 see pages 3847 see pages 1819 see pages 4849 walking beam furnace walking hearth furnace pusher furnace see pages 2023 see pages 2425 see pages 26 rotary hearth furnace see pages 3031 besides those main furnace types and heat treatment processes, sms group offers various other. The whole working procedure can be automatically controlled. Forging, stress relief furnace, tube, rod and wire, etc. Our reheating, heat treatment, melting, and refining furnaces are at the peak of todays standards.
Reheating furnaces are used in hot rolling mills to heat the steel stock billets, blooms or slabs to the rolling temperatures of around 1200 deg c. Pdf modeling of steel slab reheating process in a walking. Double walking beam furnaces are being heated increasingly by recuperation burners in addition to hotair burners. Our walking beam type reheating furnace design combines the latest advancements in hot rider and skid system technology.
How to form, pour, and stamp a concrete patio slab duration. Walking beam hardening furnace tube heating for srmill. The steel can be withdrawn from the furnace according to the need to avoid the oxidation and decarbonization caused by the longterm stopping of the steel in the furnace. Steel plant furnaces bell annealing furnace manufacturer. Top and bottomfired walking beam furnaces ensure high production rates and excellent quality steel grades.
Fig 2 typical arctangent curve used for heating steel in a reheating furnace. Reheat furnaces walking beam furnace service provider from pune. Cocchioni2 1dii dipartimento di ingegneria dellinformazione, universita politecnica delle marche, ancona an, italy 2i. The high automatic degree that assures quality and enables production in a semiautomatic and automatic machine. It is mainly designed for heating of copper, copper alloy in controllable atmosphere before rolling. Vdl weweler, a company based in the netherlands, is a producer of air suspension systems. The walking beam furnace offer distinctive advantages over others by allowing the heating of the back face of the stock. Modeling of the slab heating process in a walking beam. Increasing energy efficiency for reheating furnaces.
The further presented models consider primarily the reheating of slabs in walking beam or pushertype furnaces. Reheat furnace, pusher furnace top fired, walking hearth. Each of these furnace types varies in length, capacity, width, temperature profile, and refractory. Walking beam reheating furnace at best price in shenyang. Temperature control for reheating furnace walking hearth type. Fives range of stein reheating wbf conventional walking beam furnaces is designed to reheat long and flat products efficiently and effectively. The furnace is used to reheat slabs of steel approximately 9.
Here we emphatically introduce the continuous walking beam heating furnace. Usually, the fuel of the furnace is gaseous fuel, natural gas, heavy oil or pulverized coal, some burning lump coal, etc. Typical furnace capacities range from 30 to 350 th. Structure of a walking beam reheating furnace walking beam furnace mechanism new images walking beam furnaces electroheat a heat transfer model for the ysis of transient heating walking beam furnaces manufacturer in maharashtra india by. Mike day everything about concrete recommended for you. Nlmk contracts tenova for walking beam reheating furnace. They handle billets, heavy blooms, slabs, and beam blanks. Apr 20, 2017 tenova has been contracted by russian steel company nlmk to supply a 320tonhour walking beam furnace for its plant in lipetsk. Reheating, heat treatment, melting and refining furnaces. The advantage of using a walking beam furnace walkin beam furnaces are essentially stateoftheart reheating furnaces that are extremely efficient. Walking beam reheating furnace hot rolling mill hani tech. Furnace, industrial furnace, heating furnace manufacturer supplier in china, offering walking beam reheating furnace, t7 solution furnace for al. A furnace is an equipment to melt metals for casting or heat materials for change of shape. The oxidation levels in reheating furnaces depend on the following factors.
We have the knowhow and experience to provide reheat furnaces that optimize quality and productivity for processing slabs, billets, blooms and beam blanks. Reheat furnace pdf walking beam furnaces achieve optimal reheating and the greatest output capacity. Stein reheating wbf, a walking beam furnace fives in steel. Installation of new 3,000,000 lb walking beam gas fired reheat furnace consisting of over 12,000 individual pieces. Jan 25, 2017 nlmk contracts tenova for walking beam reheating furnace. Walking beam furnaces rs 35 lakh piece get latest price banking on our in vast domain experience of manufacturing and marketing premium range of furnaces we present walking beam furnaces that is designed to facilitate flawless precipitation with rapid water quenching ability and homogenized extrusions.
Productsservices for walking beam reheating furnaces furnaces industrial 445 companies industrial furnaces are built of several kinds of high temperature refractory materials to hold the process material and hold in the heat without breaking down during the several months that they usually run. Walking beam furnace a global refractory leader calderys. When the beams move upward, the item lying on the stationary hearth of the furnace is raised, and when the beams subsequently move in the horizontal plane through the furnace, the item is displaced, or walked, a fixed distance along with the beams. Walking hearth furnace walking beam furnace the walking beam furnace allows the product to be heated from all sides, where a walking hearth furnace only allows product to be heated from top the walking hearth furnace allows the charge to be transported through the furnace by lift and shift mechanism. This type heating furnace is used for large slab and shaped blank heating with advantages of huge capacity, no black print on the slab and blank, and timing heating exactly. Caneng roller walking beam walking hearth furnace systems are capable of processing both symmetrical and nonsymmetrical parts at a capacity up to 65 metric tonshr 140,000 lbshr. The slab reheating furnace is widely used by steel mills to elevate steel slab temperature for further processing. Available in both alloy post and beam walking beam and water cooled refractory beam walking hearth designs, caneng continues to be a leader in walking beam walking hearth furnaces. Billet reheating furnace, rolling mill furnace, pusher type. Modeling of steel slab reheating process in a walking beam reheating furnace conference paper pdf available july 2016 with 1,621 reads how we measure reads. Reheating furnace designing and manufacturing hani tech. Hot rolling our steel reheat furnaces have capacities up to 120 tons per hour and can be configured with a number of different control and firing methods to achieve the highest quality product. Available in both alloy post and beam walking beam and water cooled refractory beam walking hearth designs, caneng continues to be a leader in walking beam walking hearth furnaces for over 50 years. Pdf on control structure design for a walking beam furnace.
Product carriers are designed specifically to support individual stacks for greater thermal and payload efficiencies. Walking beam furnace walking hearth furnace examples of different beam cross sections. Included here are a number of cooled elements as well as special alloy parts that withstand high temperatures and mechanical stresses. Nlmk orders walkingbeam furnace 20170420 industrial. Also used intermittently for reheating jobs upto 1200 1250oc when temperature of jobs dropped to 850oc.