Industrial furnace

An industrial furnace is a device used to provide heat for an industrial process, typically operating at temperatures above 400 degrees Celsius. These furnaces generate heat by combusting fuel with air or oxygen, or through electrical energy, and are used across various industries for applications such as chemical reactions, cremation, oil refining, and glasswork. The residual heat is expelled as flue gas.

While the term industrial furnace encompasses a wide range of high-temperature equipment, one specific type is the direct fired heater, also known as a direct fired furnace or process furnace. Direct fired heaters are primarily used in refinery and petrochemical applications to efficiently transfer heat to process fluids by means of combustion. Unlike other industrial furnaces used in metallurgy or batch ovens, direct fired heaters are optimized for precise temperature control and high thermal efficiency in hydrocarbon processing.

Industrial furnaces are designed according to international standards, with some of the most common being ISO 13705 (Petroleum and natural gas industries — Fired heaters for general refinery service) and American Petroleum Institute (API) Standard 560 (Fired Heater for General Refinery Service).

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