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15A NCAC 02D .1401



SECTION .1400  NITROGEN OXIDES DEFINITIONS



(a) For the purpose of this Section, the definitions at G.S 143-212 and G.S. 143-213, and 15A NCAC 02D .0101 shall apply, and in addition the following definitions apply. If a term in this Rule is also defined at 15A NCAC 02D .0101, then the definition in this Rule controls.



(1) (2) (3) (4) (5) (6) (7)



(8)



(9)



(10) (11)



"Acid rain program" means the federal program for the reduction of acid rain including 40 CFR Parts 72, 75, 76, and 77. "Actual emissions" means for Rules .1416 through .1422 of this Section, emissions of nitrogen oxides as measured and calculated according to 40 CFR Part 75, Subpart H. "Actual heat input" means for Rules .1416 through .1422 of this Section, heat input as measured and calculated according to 40 CFR Part 75, Subpart H. "Averaging set of sources" means all the stationary sources included in an emissions averaging plan according to Rule .1410 of this Section. "Averaging source" means a stationary source that is included in an emissions averaging plan in accordance to Rule .1410 of this Section. "Boiler" means an enclosed fossil or other fuel-fired combustion device used to produce heat and to transfer heat to recirculating water, steam, or other medium. "Combined cycle system" means a system consisting of one or more combustion turbines, heat recovery steam generators, and steam turbines configured to improve overall efficiency of electricity generation or steam production. "Combustion turbine" means an enclosed fossil or other fuel-fired device that is comprised of a compressor, a combustor, and a turbine, and in which the flue gas resulting from the combustion of fuel in the combustor passes through the turbine, rotating the turbine. "Diesel engine" means a compression ignited two- or four-stroke engine in which liquid fuel injected into the combustion chamber ignites when the air charge has been compressed to a temperature sufficiently high for auto-ignition. "Dual fuel engine" means a compression ignited stationary internal combustion engine that is burning liquid fuel and gaseous fuel simultaneously. "Emergency generator" means a stationary internal combustion engine used to generate electricity only during:



(A) (B)



the loss of primary power at the facility that is beyond the control of the owner or operator of the facility; or maintenance when maintenance is being performed on the power supply to equipment that is essential in protecting the environment or to such equipment itself.



(12)



An emergency generator may be operated periodically to ensure that it will operate. "Emergency use internal combustion engines" means stationary internal combustion engines used to drive pumps, aerators, and other equipment only during:



(A) (B)



the loss of primary power at the facility that is beyond the control of the owner or operator of the facility; or maintenance when maintenance is being performed on the power supply to equipment that is essential in protecting the environment or to such equipment itself.



(13)



(14)



An emergency use internal combustion engine may be operated periodically to ensure that it will operate. "Excess emissions" means an emission rate that exceeds the applicable limitation or standard; for the purposes of this definition, nitrogen oxides emitted by a source covered under Rules .1416, .1417, or .1418 of this Section during the ozone season above its allocation, as may be adjusted under Rule .1419 of this Section, are not considered excess emissions. "Fossil fuel fired" means:



(A)



For sources that began operation before January 1, 1996, where fossil fuel actually combusted either alone or in combination with any other fuel, comprises more than 50 percent of the annual heat input on a Btu basis during 1995, or, if a source had no heat input in 1995, during the last year of operation of the unit before 1995;





(B)



(C)



For sources that began operation on or after January 1, 1996 and before January 1, 1997, where fossil fuel actually combusted either alone or in combination with any other fuel, comprises more than 50 percent of the annual heat input on a Btu basis during 1996; or For sources that began operation on or after January 1, 1997:



(i)



(ii)



Where fossil fuel actually combusted either alone or in combination with any other fuel, comprises more than 50 percent of the annual heat input on a Btu basis during any year; or Where fossil fuel combusted either alone or in combination with any other fuel, is projected to comprise more than 50 percent of the annual heat input on a Btu basis during any year, provided that the unit shall be "fossil fuel-fired" as of the date, during such year, on which the source begins combusting fossil fuel.



(15)



(16) (17) (18) (19)



(20) (21) (22) (23)



(24)



(25)



(26) (27) (28) (29)



(30)



(31)



"Indirect-fired process heater" means an enclosed device using controlled flame where the device's primary purpose is to transfer heat by indirect heat exchange to a process fluid, a process material that is not a fluid, or a heat transfer material, instead of steam, for use in a process. "Lean-burn internal combustion engine" means a spark ignition internal combustion engine originally designed and manufactured to operate with an exhaust oxygen concentration greater than one percent. "NOx" means nitrogen oxides. "Ozone season" means the period beginning May 31 and ending September 30 for 2004 and beginning May 1 and ending September 30 for all other years. "Potential emissions" means the quantity of NOx that would be emitted at the maximum capacity of a stationary source to emit NOx under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit NOx shall be treated as a part of its design if the limitation is federally enforceable. Such physical or operational limitations include air pollution control equipment and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed. "Projected seasonal energy input" means the maximum design heat input per hour times 3300 hours. "Projected seasonal energy output" means the maximum design energy output per hour times 3300 hours. "Reasonable assurance" means a demonstration to the Director that a method, procedure, or technique is possible and practical for a source or facility under the expected operating conditions. "Reasonably Available Control Technology" or "RACT" means the lowest emission limitation for NOx that a particular source can meet by the application of control technology that is reasonably available considering technological and economic feasibility. "Reasonable effort" means the proper installation of technology designed to meet the requirements of Rules .1407, .1408, or .1409 of this Section and the utilization this technology, according to the manufacturer's recommendations or other similar guidance for not less than six months, in an effort to meet the applicable limitation for a source. "Rich-burn internal combustion engine" means a spark ignition internal combustion engine originally designed and manufactured to operate with an exhaust oxygen concentration less than or equal to one percent. "Seasonal energy input" means the total energy input of a combustion source during the period beginning May 1 and ending September 30. "Seasonal energy output" means the total energy output of a combustion source during the period beginning May 1 and ending September 30. "Shutdown" means the cessation of operation of a source or its emission control equipment. "Source" means a stationary boiler, combustion turbine, combined cycle system, reciprocating internal combustion engine, indirect-fired process heater, or a stationary article, machine, process equipment, or other contrivance, or combination thereof, from which nitrogen oxides emanate or are emitted. "Startup" means the commencement of operation of any source that has shutdown or ceased operation for a period sufficient to cause temperature, pressure, process, chemical, or pollution control device imbalance that would result in excess emissions. "Stationary internal combustion engine" means a reciprocating internal combustion engine that is not self propelled; however, it may be mounted on a vehicle for portability.



(b) Whenever reference is made to the Code of Federal Regulations in this Section, the definitions in the Code of Federal Regulations shall apply unless specifically stated otherwise in a particular rule.





History Note:



Authority G.S. 143-215.3(a)(1); 143-215.107(a)(5), (7), (10); Eff. April 1, 1995; Temporary Amendment Eff. August 1, 2001; November 1, 2000; Amended Eff. July 18, 2002.






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Last Modified: Wed Jun 25 11:29:08 2008
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