Heat input
Heat input means heat derived from combustion of fuel in an EGU (synthetic gas for an IGCC) and does not include the heat input from preheated combustion air, recirculated flue gases, or exhaust gases from other sources such as gas turbines, internal combustion engines, etc.
Source
40 CFR § 63.10042
Scoping language
Terms used in this subpart are defined in the Clean Air Act (CAA), in 63.2 (the General Provisions), and in this section as follows: