AFurnaceis a device used for high-temperature heating. The name
derives fromGreekwordfornax, which meansoven.
InAmerican EnglishandCanadian Englishusage, the termfurnaceon its own refers to thehouseholdheating systems based on a central furnace (known either as aboiler, or aheaterin British English), and sometimes as a synonym forkiln, a device used in the production of ceramics. InBritish English, afurnaceis anindustrialfurnace used for many things, such as theextraction ofmetalfromore(smelting) or inoil refineriesand other chemical plants, for example as the heat source forfractional distillationcolumns.
The termfurnacecan also refer to a direct fired heater, used in
boiler applications in chemical industries or for providing heat to
chemical reactions for processes like cracking, and is part of the
standardEnglishnames for many metallurgical furnaces worldwide.
The heat energy to fuel a furnace may be supplied directly by fuelcombustion, by electricity such as theelectric arc furnace, or throughinduction heatingininduction furnaces.
The furnace is divided into two categories: household furnaces and
Ahouseholdfurnace is amajor appliancethat is permanently installed to provide heat to an interior space
through intermediary fluid movement, which may beair,steam, or hotwater. (Heating appliances that use steam or hot water as the fluid are
normally referred to as a residential steam boiler or residential
hot water boiler.) The most commonfuelsource for modern furnaces in the United States isnatural gas; other common fuel sources includeLPG(liquefied petroleum gas),fuel oil,coalorwood. In some caseselectrical resistanceheating is used as the source of heat, especially where the cost of
electricity is low.
Modern high-efficiency furnaces can be 98%efficientand operate without a chimney. The small amount of waste gas and
heat are mechanically ventilated through PVC pipes that can be
vented through the side or roof of the house. Fuel efficiency in a
gas furnace is measured inAFUE(Annual Fuel Utilization Efficiency).
Industrial furnaces is used to play a thermal treatment a variety
of materials or workpiece in the process of metallurgical
production. thermal treatment is a treating process which is
featured of temperature material or workpiece processing, such as
roasting, melting, heating, heat treatment, drying,ect. Most
production process of the iron and steel metallurgy and non-ferrous
metallurgy is insepa