Section 63.7499 - What are the subcategories of boilers and process heaters?The subcategories of boilers and process heaters, as defined in § 63.7575 are:
(a) Pulverized coal/solid fossil fuel units.(b) Stokers designed to burn coal/solid fossil fuel.(c) Fluidized bed units designed to burn coal/solid fossil fuel.(d) Stokers/sloped grate/other units designed to burn kiln dried biomass/bio-based solid.(e) Fluidized bed units designed to burn biomass/bio-based solid.(f) Suspension burners designed to burn biomass/bio-based solid.(g) Fuel cells designed to burn biomass/bio-based solid.(h) Hybrid suspension/grate burners designed to burn wet biomass/bio-based solid.(i) Stokers/sloped grate/other units designed to burn wet biomass/bio-based solid.(j) Dutch ovens/pile burners designed to burn biomass/bio-based solid.(k) Units designed to burn liquid fuel that are non-continental units.(l) Units designed to burn gas 1 fuels.(m) Units designed to burn gas 2 (other) gases.(n) Metal process furnaces.(o) Limited-use boilers and process heaters.(p) Units designed to burn solid fuel.(q) Units designed to burn liquid fuel.(r) Units designed to burn coal/solid fossil fuel.(s) Fluidized bed units with an integrated fluidized bed heat exchanger designed to burn coal/solid fossil fuel.(t) Units designed to burn heavy liquid fuel.(u) Units designed to burn light liquid fuel.76 FR 15664, Mar. 21, 2011, as amended at 78 FR 7163, Jan. 31, 2013