Our range of walking beam reheating furnace is the most widely used mechanization furnace. Apr 29, 2016 construction of our new walking beam furnace at the hot strip mill. Nlmk contracts tenova for walking beam reheating furnace. 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. The size of the furnace will make it one of the largest walking beam. Combustion, hot spot, talmor method, furnace, arbor coil. Reheating furnace is an essential facility of a rod mill plant where a billet is heated to the required. Which can be bloom, billet, slab, ingot to rolling temperature. Furnace design designed a top and bottom fired furnace with water cooled skids and pid based control. The project was so suc cessful that six furnaces were built between 2005 and 2008.
We deal in walking beam type reheating furnaces for a variety of applications. Walking beam furnace walking hearth furnace examples of different beam cross sections. A paradigm for the scheduling of a continuous walking beam. 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. 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. Fuel costs minimization on a steel billet reheating furnace. The automation control system design of walking beam.
The reheating furnace control system design based on. 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. In double walking beam furnaces, the material is heated to temperatures of up to 1,150 c. Bar walking beam and walking hearth furnace systems. They handle billets, heavy blooms, slabs, and beam blanks. 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. The installation techniques are various depending on materials used, i. Quaker introduced quintoplex, a fireresistant grease they had developed for a mining.
The air fuel ratio control of this furnace is feedback control which use pid controller. The slab reheating furnace is widely used by steel mills to elevate steel slab temperature for further processing. 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. Large i beams traveling on a walking beam furnace at 2700f. Construction of our new walking beam furnace at the hot strip mill. Temperature control for reheating furnace walking hearth type. 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. Estimation of the mathematical model of the reheating. Typically the reheat furnace is a refractory lined steel shell, with burners located along the furnace length to provide the necessary heat input. For the operation of charging pusher, discharge ejector, walking beam operating. Modeling of the slab heating process in a walking beam. 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.
Top and bottom fired, the walking beam furnace is highly suitable for high. 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. On control structure design for a walking beam furnace diva. 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. The product is moved through the walking beam type reheating furnace via a series of walking cycles lift, traverse, lower and returns. The furnace is designed for firing mixed gas blast furnace gas and producer gas. 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. Pdf temperature control for reheating furnace walking hearth type. Walking beam controlled atmosphere furnace btus walking beam is a high temperature thermal processing system that provides continuous temperatures up to 1800. Mar 15, 2016 the advantages and disadvantages of a walking hearth furnace are similar to those of a walking beam furnace. This paper present the mathematical model of reheating furnace walking beam type using system identification method to estimate the parameter of the. In this study, the operation of a reheating furnace is modeled as a. Double walking beam furnaces are being heated increasingly by recuperation burners in addition to hotair burners. 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.
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. Reheat furnace pdf walking beam furnaces achieve optimal reheating and the greatest output capacity. Walking hearth furnace article about walking hearth furnace. General walking beam and walking hearth furnace systems. The furnace is divided into three zones preheating, heating and soaking. Implementation of models for reheating processes in. Charging may be done as cold charging or hot charging. Walking hearth furnace, walking beam furnace, aluminium. Walking beam furnaces are used for heating slabs, billets, or rods prior to the rolling process. Walking beam type reheating furnace manufacturer exporter.
The advantages and disadvantages of a walking hearth furnace are similar to those of a walking beam furnace. This is most critical so as to ensure uniform temperature across the cross section of the billet. 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. Sistem teknik industrial furnace walking beam furnace. China walking beam reheating furnace china furnace. Comparisons of different heat transfer models of a walking. In this case we consider all system is the steady state flow process. Re heating furnace are used for reheating of billets.
Airside flexible bellows manual hot air butterfly valve. Each zone has two thermocouples to measure the average temperature. Reheat furnace, pusher furnace top fired, walking hearth. Furnace, industrial furnace, heating furnace manufacturer supplier in china, offering walking beam reheating furnace, t7 solution furnace for al. C under precisely controlled temperature and atmospheric conditions, in a full range of oxidizing and reducing atmospheres. 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. Door opens and walking beam feeds i beam to grabbers. Roller hearth reheating furnaces roller hearth furnaces are used to advantage when. The entire plc power distribution system picture of walking beam heating furnace was shown as fig. Installation of new 3,000,000 lb walking beam gas fired reheat furnace consisting of over 12,000 individual pieces. 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. In walking hearthwalking beam furnaces, the material is heated to temperatures of up to 1,300 c. Tenova core designs and supplies reheat furnaces for a variety of applications. 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.
A this motion can be accomplished in several ways utilizing hydraulic or electro. Roller hearth line allows for a very flexible wide variety of. Cocchioni2 1dii dipartimento di ingegneria dellinformazione, universita politecnica delle marche, ancona an, italy 2i. Numerical modeling of steel tube reheating in walking beam furnaces. Fuel costs minimization on a steel billet reheating. Monitoring aluminumlog temperatures in a walkingbeam furnace. Billet reheating furnace, rolling mill furnace, pusher type. Burners portfolio includes 12 different burners types from 0,15 to 7,5 mw.
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. Burners are perceived as the quality factor of the reheating furnaces, therefore italimpianti develops internally and produces the burners for its furnaces. New skid buttons with ceramic composite metal for slab reheating. The furnace is capable of reheating about 800 tons of steel to 2,400 degrees f per hour. Pdf cfd modeling of complete walking hearth reheating furnaces. The furnace is used to reheat slabs of steel approximately 9. The reheating furnace control system design based on siemens pcs7. The reheating furnace adopts moveable walking beam to move the cold slab billet to the exit side from the furnace enter side. Energy saving and environmental impact decreasing in a walking beam reheating furnace c.
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. Achieving a targeted bulk slab temperature with good uniformity along the slab length and. Jan, 2016 sistem teknik industrial furnace walking beam furnace. Alloy, chain conveyor type coating furnace and so on. Products long reheating furnaces for long longstanding. Typical furnace capacities range from 30 to 350 th.
The type of furnace could be pusher, walking hearth or walking beam either top fired or top and bottom fired. Longstanding presence in the field of reheating furnaces for long products. Motor shall be equipped with 3embedded thermistors in its hot spot region to. Walking beam furnace heat treat furnace lindbergmph. We design these furnace ensuring uniform heat distribution. The oxidation levels in reheating furnaces depend on the following factors. The entire automation control system allocation picture of walking beam heating furnace. These energy efficient and cost effective lindberg walking beam furnaces are capable of processing heavy loads at high production rates. Energy saving and environmental impact decreasing in a. Numerical simulation of a walking beam slab reheating furnace. Rolling temperature can be different for different grade of raw material, steel or.
A geometric model was developed based on the drawings of the slab walking beam reheating furnace, as shown in fig. Usually, the fuel of the furnace is gaseous fuel, natural gas, heavy oil or pulverized coal, some burning lump coal, etc. Energy consumption reheating furnace regenerative burners. Reheat furnace designed for blast furnace gas exclu sively, as. In the industrial furnaces often hot spots have been. Walking hearth furnace article about walking hearth. The gas will be either enriched with oxygen or supplementary firing of furnace oil will be done. Top and bottomfired walkingbeam furnaces ensure high production rates and excellent quality steel grades. Find details of companies offering walking beam furnaces at best price. The construction of any reheating furnace has several solutions, by either adopting the classical brick lining, or combination with monolithic materials.
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 yield loss in reheating operation varies from 1. Optimum residence time analysis for a walking beam type. Carburizing, neutral hardening, carbonitriding, annealing, isothermal annealing, normalizing, stress relieving, tempering. Designing a hotbox system to operate attached to logs in a walking beam furnace is not without difficulty. Jan 25, 2017 nlmk contracts tenova for walking beam reheating furnace.
On the thermal behavior of the slab in a reheating furnace. 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. Walking hearthwalking beam furnaces are heated by regenerative burners in addition to hotair burners. Metallurgy industries often use steel billets, at a proper temperature, to achieve the desired metallurgical, mechanical, and dimensional properties of manufactured products. The lindberg walking beam furnace is a popular choice for sintering metallic and ceramic materials under controlled atmosphere. Nov 04, 2018 the reheating furnace in general is a furnace used in hot rolling mills to heat the raw material. 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. The charge could be in the form of billets, blooms, slabs or ingots. 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. Caneng roller walking beam walking hearth furnace systems have fully integrated hardening, quenching and tempering for high volume and continuous production up to 65 metric tonshr 140,000 lbshr. The goods which are to be heated are moved inside a walking beam furnace.
Reheating furnace represents a yield loss of steel. Canengs restrained roller spray quenching technology minimizes distortion for very uniform metallurgical and mechanical properties. The reheating furnace in general is a furnace used in hot rolling mills to heat the raw material. The temperature in a walking beam furnace can normally reach up to 1,200c. 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. Typical applications include high temperature metal. Billet reheating furnace, rolling mill furnace, pusher. Walking hearth furnaces are mainly used for alloy steel with charge sizes of higher cross section. Optimal operation of steel billet reheating furnaces requires the minimization of fuel consumption while maintaining a homogeneous material thermal soak. A feasibility to electrify the combustion heated walking beam furnace. We have the knowhow and experience to provide reheat furnaces that optimize quality and productivity for processing slabs, billets, blooms and beam blanks. Here we emphatically introduce the continuous walking beam heating furnace. Nonlinear model predictive control of walking beam furnaces. Reheating furnace is the heart of any hot rolling mill where in the charge is heated to rolling temperature.
The further presented models consider primarily the reheating of slabs in walking beam or pushertype furnaces. The power supply of all plc systems in heating furnace field was realized by a usp. However the models for heat transfer phenomena are generally valid and may only need a minor adaptation for use at other reheating processes. The material is gradually fed through the furnace with the help of the water cooled beams which lift. Included here are a number of cooled elements as well as special alloy parts that withstand high temperatures and mechanical stresses. Our walking beam type reheating furnace design combines the latest advancements in hot rider and skid system technology. Application of combustion hot spot analysis to process furnace. The furnace is modeled as radiating nongray medium with carbon dioxide and water with fivezoned gas temperature and the furnace wall is considered as. Top and bottomfired walking beam furnaces ensure high production rates and excellent quality steel grades. 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. 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.
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