Reheating Furnaces for Long Products: Products

Burners are perceived as the quality factor of the reheating furnaces, therefore Italimpianti develops internally and produces the burners for its furnaces. Burners portfolio includes 12 different burners types from 0,15 to 7,5 MW. The R&D departments is focusing on the development of new burners for achieving the best product quality while reducing NOx emissions and reducing fuel consumption.

Batch operated reheating furnaces are used for large and heavy blocks or ingots in the forging industry to be forged and/or milled. These batch operated furnaces are also be used for preheating of material.

Burners can be considered as the interface to carry out the thermal process. So it is mandatory that they are optimized according to several criteria (combustion chamber size, fuel type, operating conditions of the furnace, etc) in order to achieve the best thermal performance of the furnace as far it concerns product quality, low fuel consumption and low Nox emissions. So, having the best burners available as those of Tenova is necessary but not sufficient. The overall result is achieved by means of the combined actions of the burners and of the combustion system responsible of actuating the control of the combustion process.

Tenova Italimpianti provides in-house development of Level 1 and Level 2 automation systems for new furnace installations or for existing system upgrades. The Tenova Flexytech® Level 1 system is a microprocessor based system (PLC or DCS) interfaced with HMI (Human Machine Interface) state-of-the-art display screens, to provide furnace operators with manual, automatic or Level 2 control of furnace functions and processes. In 1981, Tenova Italimpianti was the first company to utilize on-line mathematical models to automatically control the operating functions of a reheating furnace. These mathematical models have been continuously tested and improved through more than one hundred reheating furnace performance evaluations and are now crucial components of the Tenova Flexytech® Level 2 system. The Flexytech® Level 2 system provides vital furnace performance benefits such as lower specific fuel consumption and improved product temperature uniformity as well as higher mill production rates Tenova Italimpianti thanks to its extensive experience provides solutions for the optimization of the PID control parameters through: Dedicated software packages based on advanced alorithms for a complete self-tuning of the system Preventive maintenance contracts based on: regular furnace check-up (field instrumentation and software).

Modern design techniques and solutions adopted for new furnaces can give fresh life to old plants. New offset skid systems, new hot rider designs, burners with low NOx emissions are some of the advances applied to older furnaces to boost production capacity, improve temperature uniformity, enhance surface quality and save energy.

Modern design techniques and solutions adopted for new furnaces can give fresh life to old plants. New offset skid systems, new hot rider designs, burners with low NOx emissions are some of the advances applied to older furnaces to boost production capacity, improve temperature uniformity, enhance surface quality and save energy.

Tenova roller hearth furnaces implementing latest-generation direct rolling technology are suitable for slab lengths of 30-50 m and, in special cases, for endless rolling of bar lengths up to 300 m. Typical thickness ranges between 40 to 90 mm. With a constant focus on critical components such as rollers and burners, Tenova designs outstanding roller hearth furnaces. Milestones include the longest furnace, the furnace with the highest temperature and the first operating furnace with three lines.

Tenova is the world’s leading supplier of rotary hearth furnaces for a variety of process applications and product types, with over 300 references in its portfolio. Tenova rotary hearth furnace technology is adopted for specialized applications including bloom reheating, iron processing and waste reclamation processes.

Tenova has installed some of the world’s largest walking beam reheating furnaces for a variety of applications. 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.

Tenova has installed some of the world’s largest walking beam reheating furnaces for a variety of applications. 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.

Walking hearth reheating furnaces are highly flexible solutions featuring some key advantages such as: low scale production, low decarburization and no product remains in the furnace when the furnace has to stop operation (ability to walk final product piece through). The Tenova walking hearth furnace design produces a high quality final product due to the lack of mechanical marking. Our proven wheels, ramps and guide systems provide reliable furnace operation. Long refractory life, minimized deflection and convenient scale collection are the advantages of our hearth design.

Walking hearth reheating furnaces are highly flexible solutions featuring some key advantages such as: low scale production, low decarburization and no product remains in the furnace when the furnace has to stop operation (ability to walk final product piece through). The Tenova walking hearth furnace design produces a high quality final product due to the lack of mechanical marking. Our proven wheels, ramps and guide systems provide reliable furnace operation. Long refractory life, minimized deflection and convenient scale collection are the advantages of our hearth design.