The term furnace is used generically to describe energy systems that are used to heat materials to temperatures that will change either the physical or chemical properties of the material. Furnaces are among the most intensive consumers of energy.
Industrial Furnaces and Boilers | Energy Conservation in Plant
They operate at high temperatures which mean that special materials are needed to contain the heat. Similarly, heat recovery devices must be constructed from materials that are capable of withstanding the heat and consequently are expensive. Industrial furnaces are some of the most inefficient users of energy.
Furnaces offer good potential for energy conservation. To conduct, or help conducting, an energy audit to your furnace; the following need to be conducted:
Obtain nameplate information.
Obtain operational details, including fuel use, furnace type, and operating hours.
Conduct visual inspection of condition of furnace and auxiliaries; determine condition and readings of instrumentation.
Examine furnace log.
Identify test points.
Determine type of test and instrumentation required.
Identify conservation opportunities from improved operation.
Develop action plan.
The visual inspection allows the operator/energy surveyor to see for himself the condition of the plant and its auxiliary equipment and confirm the interview information. In addition to the furnace, the operator/energy surveyor should check several auxiliary systems:
Air supply system.
Fuel supply system.
Furnace control system.
Further information is available from checking the furnace operations log. The operator / energy surveyor will determine whether to test the furnace as part of the detailed energy survey based on date of last efficiency check, installed instrumentation and operational conditions.