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A furnace used for heat treatment of materials, with or without direct firing; pieces are loaded through one door, progress continuously through the furnace, and are discharged from another door.



Related Terms

BATCH-TYPE FURNACE

A furnace used for heat treatment of materials, with or without direct firing; loading and unloading operations are carried out through a single door or slot.

SHRINK WRAPPING

Heat treatment that shrinks an envelope of polyethylene or similar substance around several units, thus forming one unit. It is used e.g. to secure packages on a pallet.

GLASS FURNACE

A large, covered furnace or tank for melting large batches of glass, in which heat is supplied by a flame playing over the glass surface, and regenerative heating of combustion air and gas is usually employed. Also known as glass tank.

ELECTRIC FURNACE

A furnace in which the air is heated by passing directly over the electric heating elements. Electric energy is converted to heat using open wire resistance heating elements.
The main advantage offered by the electric furnace is the neutral nature of the heat source. The most common type of electric furnace is the direct-arc type where the heat comes from arcing between the long graphite electrodes and molten charge. It is the efficient method and modern steel plants use this method.

HIGH-FREQUENCY FURNACE

An induction furnace in which the heat is generated within the charge, within the walls of the containing crucible, or within both, by currents induced by Also known as beat reception.

COMBUSTION FURNACE

A furnace whose source of heat is the energy released in the oxidation of fossil fuel.

FURNACE RELEASE RATE

The heat available per square foot of heat-absorbing surface in the furnace. That surface is the projected area of tubes and extended metallic surfaces on the furnace side including walls, floors, roof, partition walls, and platens and the area of the plane of the furnace exit which is defined as the entrance to the convection tube bank.

DRY BACK

The baffle provided in a firetube boiler joining the furnace to the second pass to direct the products of combustion, that is so constructed to be separate from the pressure vessel and constructed of heat resistant material. (Generally refractory and insulating material)

BOILER CONVECTION SECTION

The part of a furnace between the radiant section and the stack. The area is filled with tubes or pipes which carry process steam and which absorb heat via convection heat transfer from the hot gases passing through the area on their way out of the stack. The convection section forms an obstacle to the combustion gas flow and can greatly affect furnace draft in the radiant section of the furnace.

RADIANT SECTION

The part of a process heater into which the burners fire. Tubes mounted in this area of the furnace receive heat principally via direct radiation from both burner flames and furnace refractory. Physical volume arrangement of the radiant section has a great effect on burner choice and required flame patterns.

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