What is reheat furnace?

What is reheat furnace?

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 which is suitable for plastic deformation of steel and hence for rolling in the mill.

Which refractory used in the furnace roof of reheating furnace?

High Alumina Refractory Bricks, Chamotte Refractory Brick, Insulation Refractory Brick, Insulation Castable, Refractory Castable and Refractory Gunning Mortar are main refractory materials for reheating furnaces, and we supply all kind of refractories according to customer requirements.

What material is used for the inside lining of the heat furnace in a rolling mill?

Reheating furnaces for rolling mills are traditionally lined with hard (dense) refractory such as bricks, castable, gunite, shotcrete, etc. Such dense refractory do not fare well when exposed to intense and continuous flame impingement, thermal cycling and alkali attack.

What is a walking beam furnace?

Walking beam furnaces are essentially state-of-the-art heating furnaces that are extremely efficient for processing large/heavy parts in semi-continuous mode. Extremely efficient for processing large/heavy parts in semi-continuous mode.

How does a recuperator work?

The recuperator transfers some of the waste heat in the exhaust to the compressed air, thus preheating it before entering the fuel burner stage. By recovering some of the energy usually lost as waste heat, the recuperator can make a heat engine or gas turbine significantly more efficient.

Which of the most thermally efficient furnace?

Which is the most thermally efficient furnace?

• A. Reheating furnace.
• Reverberatory furnace.
• Rotary kilns.
• Boiler furnace.

How do furnaces bear large amount of heat?

Answer: the furnace transfer heat to the living space of the building through an intermediary distribution system . if the distribution is through hot water (or other fluid) or through steam , then the furnace is more commonly called boiler.

What is a wet charge?

Wet charge materials are a serious safety hazard in all foundries. Water, moisture, or any liquid-bearing material instantaneously turns to steam when coming in contact with molten metal — expanding to 1,600 times its original volume and producing a violent explosion.

What is the difference between a recuperator and a regenerator?

In a regenerator heat from the primary medium is first stored in a thermal mass and later (next cycle) regenerated from that mass by the secondary medium. In a recuperator both media are separated by a wall through which heat is transferred directly.

What is heat recuperator?

A recuperator is a special purpose counter-flow energy recovery heat exchanger positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process, in order to recover the waste heat.

What type of heat transfer is a furnace?

Furnaces employing combustion produce a hot gas which transfers heat to the material by radiation and convection. Solids are heated by direct contact, but fluids are usually heated indirectly, being carried inside pipes within the furnace.

When the furnace is operated below 370 OC then it is called?

When the furnace is operated below 370 °C. temperature then it is called as oven, and when it operates above 370 °C temperature then the. operating equipment is called furnace. 2.4 Furnaces – revised (table format)

What is the combustion system of a reheating furnace?

Combustion System of a Reheating Furnace. The main function of a reheating furnace is to raise the temperature of the semi-finished steels (billets, blooms, slabs or rounds) typically to temperatures between 1000 deg C and 1250 deg C, until it is plastic enough to be rolled to the desired section, size or shape in the hot rolling mill.

What is a reheating furnace used for in a steel plant?

In steel plants reheating furnaces are used in hot rolling mills to heat the steel stock (Billets, blooms or slabs) to temperatures of around 1200 deg C which is suitable for plastic deformation of steel and hence for rolling in the mill.

How to optimize the performance of the reheating furnace?

Therefore, optimal operation of a reheating furnace requires real-time combustion product data with the suitable sensors. A recuperator is normally used in the reheating furnaces as a waste heat recovery unit to realize high thermal efficiency and energy conservation.

What is a recuperator in a reheating furnace?

A recuperator is normally used in the reheating furnaces as a waste heat recovery unit to realize high thermal efficiency and energy conservation. The recovered waste heat is used to preheat the combustion air, which is then fed to a burner.