Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 145 - NOx CONTROL PROGRAM › Section 096-145-2 - Definitions

Current through 2024-29, July 17, 2024
A.
Affected source.
"Affected
				source" means a fossil fuel fired electric generating unit, resource recovery
				unit or fossil fuel fired boiler or indirect heat exchanger with a maximum heat
				input capacity of 250 mm Btu/hour or more
constructed before
				1995
.
B.
Electric
				generating unit.
"Electric generating unit" means any fossil fuel fired
				combustion unit of 25 MW electric generating capacity, or greater, which
				provides electricity for sale or use.
C.
Fossil fuel.
"Fossil fuel"
				means natural gas, petroleum, coal or any form of solid, liquid or gaseous fuel
				derived wholly, or in part, from such material.
D.
Fossil fuel fired.
"Fossil
				fuel fired" means the combustion of fossil fuel or, if in combination with any
				other fuel, fossil fuel comprises 51% or greater of the annual
				(
calendar year basis
) heat input on a Btu basis.
E.
Heat input.
"Heat input"
				means heat derived from the combustion of fuel in an affected source and does
				not include the heat derived from preheated combustion air, recirculated flue
				gas, or exhaust from other sources.
F.
Indirect Heat Exchanger.
"Indirect heat exchanger" means combustion equipment in which the flame
				and/or products of combustion are separated from any contact with the principal
				material in the process by metallic or refractory walls, which includes, but is
				not limited to, steam boilers, vaporizers, melting pots, heat exchangers,
				column reboilers, fractioning column feed preheaters, reactor feed preheaters,
				fuel-fired reactors such as steam hydrocarbon reformer heaters and pyrolisis
				heaters.
G.
Maximum heat
				input capacity.
"Maximum heat input capacity" means the maximum heat
				value an affected source can combust on a steady state basis as determined by
				the physical and operational design and characteristics of the affected source.
				Maximum heat input capacity is expressed in millions of British Thermal Units
				(mmBtu) per unit of time. Maximum heat input capacity is the product of the
				gross caloric value (Higher Heating Value) of the fuel (expressed in Btu/pound)
				multiplied by the maximum fuel feed rate for the combustion device (expressed
				in mass of fuel/time).
H.
Ninety-Day Rolling Average.
"Ninety-day rolling average" or "90-day
				rolling average" means the total mass of emissions over a 90-day period divided
				by the total heat input over a 90- day period. Each day shall establish a new
				90-day rolling average period.
I.
Resource Recovery Unit.
"Resource recovery unit" means any unit
				where municipal wastes are incinerated to produce usable energy.
J.
Selective Non-Catalytic
				Reduction.
"Selective non-catalytic reduction" or "SNCR" means a control
				technology utilizing ammonia or urea to reduce nitrogen oxides to elemental
				nitrogen (N2) and oxygen (O2)
				without the use of a catalyst. The control effectiveness of SNCR depends on
				boiler specific factors. U.S. EPA's "Compilation of Air Pollution Emission
				Factors," AP-42, reports that NOx reductions of 25 to 40 percent have been
				achieved using SNCR.