Installation of new 3,000,000 lb walking beam gas fired reheat furnace consisting of over 12,000 individual pieces. In this case we consider all system is the steady state flow process. Optimal operation of steel billet reheating furnaces requires the minimization of fuel consumption while maintaining a homogeneous material thermal soak. To prevent unwanted oxidation of the material which will be heated up in the furnace. General walking beam and walking hearth furnace systems. Tenova has been contracted by russian steel company nlmk to supply a 320tonhour walkingbeam furnace for its plant in lipetsk. Estimation of the mathematical model of the reheating. Tenova was contracted by nlmk earlier this year to design and supply a 395tonhour walking beam furnace for reheating slabs at its plant in sharon, pa. The charge could be in the form of billets, blooms, slabs or ingots.
In this paper, a comprehensive twodimensional 2d numerical heat transfer model for slab reheating in a walking beam furnace was developed using the finite difference method. Walking beam furnace walking hearth furnace examples of different beam cross sections. In walking hearthwalking beam furnaces, the material is heated to temperatures of up to 1,300 c. Fuel costs minimization on a steel billet reheating furnace.
Billet reheating furnace, rolling mill furnace, pusher type. Roller hearth reheating furnaces roller hearth furnaces are used to advantage when. Numerical simulation of a walking beam slab reheating furnace. The furnace is divided into three zones preheating, heating and soaking. The total scale free heating up of steel in oil or gas fired furnaces is possible. 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. Each zone has two thermocouples to measure the average temperature. Typical applications include high temperature metal. The reheat furnace performs a fundamental role in steel mills and is the primary mechanism for heating steel to the temperatures required for subsequent rolling and forming.
The furnace is used to reheat slabs of steel approximately 9. A this motion can be accomplished in several ways utilizing hydraulic or electro. Charging may be done as cold charging or hot charging. The yield loss in reheating operation varies from 1.
Walking beam furnaces wbfs are broadly utilized in the modern steel industry to reheat the steel slabs to prescribed temperatures in order to change its. The advantages and disadvantages of a walking hearth furnace are similar to those of a walking beam furnace. Annealing forging in front of bogie hearth furnace the rath group sales team. Soaking zone has 10 burners type nxb125 temperature of each zones are different according to function. The installation techniques are various depending on materials used, i. 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. Walking hearth furnace article about walking hearth furnace. Products long reheating furnaces for long longstanding.
Walking hearthwalking beam furnaces are heated by regenerative burners in addition to hotair burners. Development of the maerz double walking beam fur nace for heattreating of. Reheating furnace is an essential facility of a rod mill plant where a billet is heated to the required. The temperature in a walking beam furnace can normally reach up to 1,200c. Reheat furnace designed for blast furnace gas exclu sively, as. 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. Furnace design designed a top and bottom fired furnace with water cooled skids and pid based control. Typical furnace capacities range from 30 to 350 th. Walkingbeam furnace with precast shapes castable lining in roller furnace. The units, both end or sidedischarging, are either walking beam type or pusher type having stationery hearths with top and bottom burners. Reheating furnaces soaking zone hearth refractoriesa. Apr 20, 2017 tenova adopted the bestavailable technologies and its latest technical innovations to satisfy the expectations of nlmk. Estimation of the mathematical model of the reheating furnace.
Energy saving in walking beam furnaces by a new concept for. The reheating furnace control system design based on. Walking beam type reheating furnace manufacturer exporter. Walking beam furnaces our walking beam furnace is mainly used within the steel industry for applications like annealing, forging, heating, stress relieving, quenching and tempering with a maximum operating temperature of 1100c. Door opens and walking beam feeds i beam to grabbers. The walking beam furnace offer distinctive advantages over others by allowing the heating of the back face of the stock. Walking beam controlled atmosphere furnace btus walking beam is a high temperature thermal processing system that provides continuous temperatures up to 1800. The reheating furnace control system design based on siemens pcs7. The material is gradually fed through the furnace with the help of the water cooled beams which lift. The furnace is designed for firing mixed gas blast furnace gas and producer gas. On the thermal behavior of the slab in a reheating furnace.
Billet reheating furnace, rolling mill furnace, pusher. Optimisation of a slab heating pattern with various skid button. Modeling of the slab heating process in a walking beam. We deal in walking beam type reheating furnaces for a variety of applications. Walking beam furnaces afcholcrofts walking beam furnaces are designed to provide greater uptime, ease of maintenance, trouble free operation and can be custom designed to meet your exact processing requirements.
Here we emphatically introduce the continuous walking beam heating furnace. Comparisons of different heat transfer models of a walking. The gas will be either enriched with oxygen or supplementary firing of furnace oil will be done. 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. Top and bottom fired, the walking beam furnace is highly suitable for high. Products are moved periodically through the furnace by the rotation of the beam. The automation control system design of walking beam. At such a step, the doors open and the beam moves all products a fixed distance to the right. This paper has proposed openloop identification and principle of thermal system to estimate the mathematical model of the slab reheating furnace walking beam type using genetic algorithm with the temperature response in heating up curve process.
China walking beam reheating furnace china furnace. Nov 02, 2015 after the system exits the furnace and data is downloaded from the logger, software capable of carrying out a fast and accurate analysis of the process is the final important element of this type of system. Alloy, chain conveyor type coating furnace and so on. New skid buttons with ceramic composite metal for slab reheating. Caneng roller walking beamwalking hearth furnace systems are capable of processing both symmetrical and nonsymmetrical parts at a capacity up to 65 metric tonshr 140,000 lbshr. The entire automation control system allocation picture of walking beam heating furnace. Top and bottomfired walking beam furnaces ensure high production rates and excellent quality steel grades.
Electric, gas or oil fired walkingbeam furnaces pdf fk. Threedimensional of the turbulent reactive flow and radiative heat transfer problem in a walkingbeamtype slab reheating furnace simulations are successfully. The reheating furnace adopts moveable walking beam to move the cold slab billet to the exit side from the furnace enter side. The slab reheating furnace is widely used by steel mills to elevate steel slab temperature for further processing. In walking hearth walking beam furnaces, the material is heated to temperatures of up to 1,300 c. Energy saving in walking beam furnaces by a new concept. Carburizing, neutral hardening, carbonitriding, annealing, isothermal annealing, normalizing, stress relieving, tempering. Our range of walking beam reheating furnace is the most widely used mechanization furnace.
Furnace, industrial furnace, heating furnace manufacturer supplier in china, offering walking beam reheating furnace, t7 solution furnace for al. Usually, the fuel of the furnace is gaseous fuel, natural gas, heavy oil or pulverized coal, some burning lump coal, etc. On control structure design for a walking beam furnace diva. Fuel costs minimization on a steel billet reheating. 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.
The goods which are to be heated are moved inside a walking beam furnace. Reheating furnace is continuous type furnace using to heat steel stock for hot rolling mill. Optimum residence time analysis for a walking beam type. Pdf on control structure design for a walking beam furnace. The entire plc power distribution system picture of walking beam heating furnace was shown as fig. Energy consumption reheating furnace regenerative burners. Expansion of busi ness to include heating and heat treat ment furnaces for steel. 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. The furnace is capable of reheating about 800 tons of steel to 2,400 degrees f per hour. Jan 22, 2015 draft working on walking beam furnace. Typically the reheat furnace is a refractory lined steel shell, with burners located along the furnace length to. Reheat furnace pdf walking beam furnaces achieve optimal reheating and the greatest output capacity. Caneng roller walking beamwalking hearth furnace systems have fully integrated hardening, quenching and tempering for high volume and continuous production up to 65 metric tonshr 140,000 lbshr. Typically the reheat furnace is a refractory lined steel shell, with burners located along the furnace length to provide the necessary heat input.
A geometric model was developed based on the drawings of the slab walking beam reheating furnace, as shown in fig. The power supply of all plc systems in heating furnace field was realized by a usp. Find details of companies offering walking beam furnaces at best price. Problems of reheating furnaces in a reheating furnace pusher type the severity of operational conditions.
A paradigm for the scheduling of a continuous walking beam. Included here are a number of cooled elements as well as special alloy parts that withstand high temperatures and mechanical stresses. Tenova adopted the bestavailable technologies and its latest technical innovations to. Large i beams traveling on a walking beam furnace at 2700f. Walking hearth furnace, walking beam furnace, aluminium. Monitoring aluminumlog temperatures in a walkingbeam furnace. 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. 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.
Construction of our new walking beam furnace at the hot strip mill. We are providing complete solution for reheating furnace such as design, engineering, fabrication, erection, automation, commissioning, training, etc. Startup of the furnace is scheduled for september 2019. The furnace is capable of reheating about 800 tons of steel to 2,400 degrees f. The type of furnace could be pusher, walking hearth or walking beam either top fired or top and bottom fired. Top and bottomfired walkingbeam furnaces ensure high production rates and excellent quality steel grades. 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. Reheating furnace is the heart of any hot rolling mill where in the charge is heated to rolling temperature. Re heating furnace are used for reheating of billets. The product is moved through the walking beam type reheating furnace via a series of walking cycles lift, traverse, lower and returns. Temperature control for reheating furnace walking hearth type. The project was so suc cessful that six furnaces were built between 2005 and 2008.
The oxidation levels in reheating furnaces depend on the following factors. Tailormade solutions for reheating furnaces in the steel. Reheat furnaces walking beam furnace service provider. In this study, the operation of a reheating furnace is modeled as a.
Achieving a targeted bulk slab temperature with good uniformity along the slab length and through. Afcholcrofts walking beam furnaces are designed to provide greater uptime, ease of maintenance, trouble free operation and can be custom designed to meet your exact processing requirements. 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. The furnace loses heat to the cooling water of the skid pipe system. 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. 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. Nonlinear model predictive control of walking beam furnaces.
This also normally results in shorter heating time and shorter length of the furnace itself apart from operational flexibility. Canengs restrained roller spray quenching technology minimizes distortion for very uniform metallurgical and mechanical properties. C under precisely controlled temperature and atmospheric conditions, in a full range of oxidizing and reducing atmospheres. 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. The reheat furnace performs a fundamental role in steel mills and is the primary mechanism for heating steel to the temperatures required for subsequent rolling. Bar walking beam and walking hearth furnace systems. After the system exits the furnace and data is downloaded from the logger, software capable of carrying out a fast and accurate analysis of the process is the final important element of this type of system. Mar 15, 2016 the advantages and disadvantages of a walking hearth furnace are similar to those of a walking beam furnace. Walking beam furnaces are used for heating slabs, billets, or rods prior to the rolling process. Nlmk orders walkingbeam furnace 20170420 industrial. They handle billets, heavy blooms, slabs, and beam blanks. Reheat furnace, pusher furnace top fired, walking hearth.
Our walking beam type reheating furnace design combines the latest advancements in hot rider and skid system technology. 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 article about walking hearth. Energy saving in walking beam furnaces by a new concept for skid. Tailormade solutions for reheating furnaces in the steel industry.
Metallurgy industries often use steel billets, at a proper temperature, to achieve the desired metallurgical, mechanical, and dimensional properties of manufactured products. 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. Temperature control for reheating furnace walking hearth. Designing a hotbox system to operate attached to logs in a walking beam furnace is not without difficulty. Reheating furnace represents a yield loss of steel. Furnace systems for the steel and copper industry andritz group. Numerical modeling of a walkingbeamtype slab reheating furnace. Apr 29, 2016 construction of our new walking beam furnace at the hot strip mill. The construction of any reheating furnace has several solutions, by either adopting the classical brick lining, or combination with monolithic materials.