There are two classes of units covered under the Part 266, Subpart H regulations—BIFs. U.S. EPA defines a boiler as an enclosed device that uses controlled flame combustion to recover and export energy in the form of steam, heated fluid, or heated gases. Boilers must have a combustion chamber and a primary energy recovery system of integral design to ensure the effectiveness of the unit's energy recovery system and to maintain a thermal energy recovery efficiency of at least 60%. Finally, in order to meet U.S. EPA's definition of boiler, the unit must export and use at least 75% of the recovered energy off-site.
An industrial furnace is a unit that is an integral part of a manufacturing process and uses thermal treatment to recover materials or energy. The 12 devices that are considered to be industrial furnaces can be found in Table 23.1. An example of such industrial furnaces23 is shown in Figure 23.2.
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