NR 462.02(13)(13) “Dry scrubber” means an add-on air pollution control system that injects dry alkaline sorbent (dry injection) or sprays an alkaline sorbent (spray dryer) to react with and neutralize acid gas in the exhaust stream forming a dry powder material. Sorbent injection systems in fluidized bed boilers and process heaters are included in this definition. NR 462.02(14)(14) “Electric utility steam generating unit” means a fossil fuel-fired combustion unit of more than 25 megawatts that serves a generator that produces electricity for sale. A fossil fuel-fired unit that cogenerates steam and electricity and supplies more than one-third of its potential electric output capacity and more than 25 megawatts electrical output to any utility power distribution system for sale is considered an electric utility steam generating unit. NR 462.02(15)(15) “Electrostatic precipitator” means an add-on air pollution control device used to capture particulate matter by charging the particles using an electrostatic field, collecting the particles using a grounded collecting surface and transporting the particles into a hopper. NR 462.02(16)(16) “Fabric filter” means an add-on air pollution control device used to capture particulate matter by filtering gas streams through filter media, also known as a baghouse. NR 462.02(17)(17) “Federally enforceable” means all limitations and conditions that are enforceable by the EPA administrator, including the requirements of 40 CFR parts 60 and 61, requirements within any applicable state implementation plan and any permit requirements established under 40 CFR 52.21 or under 40 CFR 51.18 and 40 CFR 51.24. NR 462.02(18)(18) “Firetube boiler” means a boiler in which hot gases of combustion pass through the tubes and water contacts the outside surfaces of the tubes. NR 462.02(19)(19) “Fossil fuel” means natural gas, petroleum, coal and any form of solid, liquid or gaseous fuel derived from those materials. NR 462.02(20)(20) “Fuel type” means each category of fuels that share a common name or classification. Examples include bituminous coal, subbituminous coal, lignite, anthracite, biomass, construction and demolition material, salt water laden wood, creosote treated wood, tires and residual oil. Individual fuel types received from different suppliers are not considered new fuel types except for construction and demolition material. NR 462.02(21)(21) “Gaseous fuel” includes natural gas, process gas, landfill gas, coal derived gas, refinery gas and biogas. Blast furnace gas is exempted from this definition. NR 462.02(22)(22) “Heat input” means heat derived from combustion of fuel in a boiler or process heater 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, kilns and other similar sources. NR 462.02(23)(23) “Industrial boiler” means a boiler used in manufacturing, processing, mining and refining or any other industry to provide one or more of the following: electricity, steam or hot water. NR 462.02(24)(24) “Large gaseous fuel subcategory” includes any water tube boiler or process heater that burns gaseous fuels not combined with any solid fuels, burns liquid fuel only during periods of gas curtailment or gas supply emergencies, has a rated capacity of greater than 10 mmBtu per hour heat input and has an annual capacity factor of greater than 10%. NR 462.02(25)(25) “Large liquid fuel subcategory” includes any water tube boiler or process heater that does not burn any solid fuel and burns any liquid fuel either alone or in combination with gaseous fuels, has a rated capacity of greater than 10 mmBtu per hour heat input and has an annual capacity factor of greater than 10%. Large gaseous fuel boilers and process heaters that burn liquid fuel during periods of gas curtailment or gas supply emergencies are not included in this definition. NR 462.02(26)(26) “Large solid fuel subcategory” includes any water tube boiler or process heater that burns any amount of solid fuel either alone or in combination with liquid or gaseous fuels, has a rated capacity of greater than 10 mmBtu per hour heat input and has an annual capacity factor of greater than 10%. NR 462.02(27)(27) “Limited use gaseous fuel subcategory” includes any water tube boiler or process heater that burns gaseous fuels not combined with any liquid or solid fuels, burns liquid fuel only during periods of gas curtailment or gas supply emergencies, has a rated capacity of greater than 10 mmBtu per hour heat input and has a federally enforceable annual average capacity factor of equal to or less than 10%. NR 462.02(28)(28) “Limited use liquid fuel subcategory” includes any water tube boiler or process heater that does not burn any solid fuel and burns any liquid fuel either alone or in combination with gaseous fuels, has a rated capacity of greater than 10 mmBtu per hour heat input and has a federally enforceable annual average capacity factor of equal to or less than 10%. Limited use gaseous fuel boilers and process heaters that burn liquid fuel during periods of gas curtailment or gas supply emergencies are not included in this definition. NR 462.02(29)(29) “Limited use solid fuel subcategory” includes any water tube boiler or process heater that burns any amount of solid fuel either alone or in combination with liquid or gaseous fuels, has a rated capacity of greater than 10 mmBtu per hour heat input and has a federally enforceable annual average capacity factor of equal to or less than 10%. NR 462.02(30)(30) “Liquid fossil fuel” means petroleum, distillate oil, residual oil and any form of liquid fuel derived from these fuels. NR 462.02(31)(31) “Liquid fuel” includes distillate oil, residual oil, waste oil and process liquids. NR 462.02(32)(32) “Minimum pressure drop” means 90% of the lowest test-run average pressure drop measured according to Table 7 of this chapter during the most recent performance test demonstrating compliance with the applicable emission limit. NR 462.02(33)(33) “Minimum scrubber effluent pH” means 90% of the lowest test-run average effluent pH measured at the outlet of the wet scrubber according to Table 7 of this chapter during the most recent performance test demonstrating compliance with the applicable hydrogen chloride emission limit. NR 462.02(34)(34) “Minimum scrubber flow rate” means 90% of the lowest test-run average flow rate measured according to Table 7 of this chapter during the most recent performance test demonstrating compliance with the applicable emission limit. NR 462.02(35)(35) “Minimum sorbent injection rate” means 90% of the lowest test-run average sorbent or activated carbon flow rate measured according to Table 7 of this chapter during the most recent performance test demonstrating compliance with the applicable emission limits. NR 462.02(36)(36) “Minimum voltage”, “minimum secondary current” or “minimum total power input” means 90% of the lowest test-run average voltage or secondary current or total power input to the electrostatic precipitator measured according to Table 7 of this chapter during the most recent performance test demonstrating compliance with the applicable emission limits. NR 462.02(37)(a)(a) A naturally occurring mixture of hydrocarbon and non-hydrocarbon gases found in geologic formations beneath the earth’s surface, of which the principal constituent is methane. NR 462.02(37)(b)(b) Liquid petroleum gas, as defined by the American Society for Testing and Materials in ASTM D1835-03a, “Standard Specification for Liquid Petroleum Gases”, incorporated by reference in s. NR 484.10 (26m). NR 462.02(38)(38) “Opacity” means the degree to which emissions reduce the transmission of light and obscure the view of an object in the background. NR 462.02(39)(39) “Particulate matter” means any finely divided solid or liquid material, other than uncombined water, as measured by the test methods specified under this chapter, or an alternative method.