[Code of Federal Regulations]
[Title 40, Volume 14]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR76.2]
[Page 439-442]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 76--ACID RAIN NITROGEN OXIDES EMISSION REDUCTION PROGRAM--Table of Contents
Sec. 76.2 Definitions.
All terms used in this part shall have the meaning set forth in the
Act, in Sec. 72.2 of this chapter, and in this section as follows:
Alternative contemporaneous annual emission limitation means the
maximum allowable NOX emission rate (on a lb/mmBtu, annual
average basis) assigned to an individual unit in a NOX
emissions averaging plan pursuant to Sec. 76.10.
Alternative technology means a control technology for reducing
NOX emissions that is outside the scope of the definition of
low NOX burner technology. Alternative technology does not
include overfire air as applied to wall-fired boilers or separated
overfire air as applied to tangentially fired boilers.
Approved clean coal technology demonstration project means a project
using funds appropriated under the Department of Energy's ``Clean Coal
Technology Demonstration Program,'' up to a total amount of
$2,500,000,000 for commercial demonstration of clean coal technology, or
similar projects funded
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through appropriations for the Environmental Protection Agency. The
Federal contribution for a qualifying project shall be at least 20
percent of the total cost of the demonstration project.
Arch-fired boiler means a dry bottom boiler with circular burners,
or coal and air pipes, oriented downward and mounted on waterwalls that
are at an angle significantly different from the horizontal axis and the
vertical axis. This definition shall include only the following units:
Holtwood unit 17, Hunlock unit 6, and Sunbury units 1A, 1B, 2A, and 2B.
This definition shall exclude dry bottom turbo fired boilers.
Cell burner boiler means a wall-fired boiler that utilizes two or
three circular burners combined into a single vertically oriented
assembly that results in a compact, intense flame. Any low
NOX retrofit of a cell burner boiler that reuses the existing
cell burner, close-coupled wall opening configuration would not change
the designation of the unit as a cell burner boiler.
Coal-fired utility unit means a utility unit in which the combustion
of coal (or any coal-derived fuel) on a Btu basis exceeds 50.0 percent
of its annual heat input during the following calendar year: for Phase I
units, in calendar year 1990; and, for Phase II units, in calendar year
1995 or, for a Phase II unit that did not combust any fuel that resulted
in the generation of electricity in calendar year 1995, in any calendar
year during the period 1990-1995. For the purposes of this part, this
definition shall apply notwithstanding the definition in Sec. 72.2 of
this chapter.
Combustion controls means technology that minimizes NOX
formation by staging fuel and combustion air flows in a boiler. This
definition shall include low NOX burners, overfire air, or
low NOX burners with overfire air.
Cyclone boiler means a boiler with one or more water-cooled
horizontal cylindrical chambers in which coal combustion takes place.
The horizontal cylindrical chamber(s) is (are) attached to the bottom of
the furnace. One or more cylindrical chambers are arranged either on one
furnace wall or on two opposed furnace walls. Gaseous combustion
products exiting from the chamber(s) turn 90 degrees to go up through
the boiler while coal ash exits the bottom of the boiler as a molten
slag.
Demonstration period means a period of time not less than 15 months,
approved under Sec. 76.10, for demonstrating that the affected unit
cannot meet the applicable emission limitation under Sec. 76.5, 76.6, or
76.7 and establishing the minimum NOX emission rate that the
unit can achieve during long-term load dispatch operation.
Dry bottom means the boiler has a furnace bottom temperature below
the ash melting point and the bottom ash is removed as a solid.
Economizer means the lowest temperature heat exchange section of a
utility boiler where boiler feed water is heated by the flue gas.
Flue gas means the combustion products arising from the combustion
of fossil fuel in a utility boiler.
Group 1 boiler means a tangentially fired boiler or a dry bottom
wall-fired boiler (other than a unit applying cell burner technology).
Group 2 boiler means a wet bottom wall-fired boiler, a cyclone
boiler, a boiler applying cell burner technology, a vertically fired
boiler, an arch-fired boiler, or any other type of utility boiler (such
as a fluidized bed or stoker boiler) that is not a Group 1 boiler.
Low NOX burners and low NOX burner technology
means commercially available combustion modification NOX
controls that minimize NOX formation by introducing coal and
its associated combustion air into a boiler such that initial combustion
occurs in a manner that promotes rapid coal devolatilization in a fuel-
rich (i.e., oxygen deficient) environment and introduces additional air
to achieve a final fuel-lean (i.e., oxygen rich) environment to complete
the combustion process. This definition shall include the staging of any
portion of the combustion air using air nozzles or registers located
inside any waterwall hole that includes a burner. This definition shall
exclude the staging of any portion of the combustion air using air
nozzles or ports located outside any waterwall hole that includes a
burner (commonly referred to as NOX ports or separated
overfire air ports).
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Maximum Continuous Steam Flow at 100% of Load means the maximum
capacity of a boiler as reported in item 3 (Maximum Continuous Steam
Flow at 100% Load in thousand pounds per hour), Section C ( design
parameters), Part III (boiler information) of the Department of Energy's
Form EIA-767 for 1995.
Non-plug-in combustion controls means the replacement, in a cell
burner boiler, of the portions of the waterwalls containing the cell
burners by new portions of the waterwalls containing low NOX
burners or low NOX burners with overfire air.
Operating period means a period of time of not less than three
consecutive months and that occurs not more than one month prior to
applying for an alternative emission limitation demonstration period
under Sec. 76.10, during which the owner or operator of an affected unit
that cannot meet the applicable emission limitation:
(1) Operates the installed NOX emission controls in
accordance with primary vendor specifications and procedures, with the
unit operating under normal conditions; and
(2) records and reports quality-assured continuous emission
monitoring (CEM) and unit operating data according to the methods and
procedures in part 75 of this chapter.
Plug-in combustion controls means the replacement, in a cell burner
boiler, of existing cell burners by low NOX burners or low
NOX burners with overfire air.
Primary vendor means the vendor of the NOX emission
control system who has primary responsibility for providing the
equipment, service, and technical expertise necessary for detailed
design, installation, and operation of the controls, including process
data, mechanical drawings, operating manuals, or any combination
thereof.
Reburning means reducing the coal and combustion air to the main
burners and injecting a reburn fuel (such as gas or oil) to create a
fuel-rich secondary combustion zone above the main burner zone and final
combustion air to create a fuel-lean burnout zone. The formation of
NOX is inhibited in the main burner zone due to the reduced
combustion intensity, and NOX is destroyed in the fuel-rich
secondary combustion zone by conversion to molecular nitrogen.
Selective catalytic reduction means a noncombustion control
technology that destroys NOX by injecting a reducing agent
(e.g., ammonia) into the flue gas that, in the presence of a catalyst
(e.g., vanadium, titanium, or zeolite), converts NOX into
molecular nitrogen and water.
Selective noncatalytic reduction means a noncombustion control
technology that destroys NOX by injecting a reducing agent
(e.g., ammonia, urea, or cyanuric acid) into the flue gas, downstream of
the combustion zone that converts NOX to molecular nitrogen,
water, and when urea or cyanuric acid are used, to carbon dioxide
(CO2).
Stoker boiler means a boiler that burns solid fuel in a bed, on a
stationary or moving grate, that is located at the bottom of the
furnace.
Tangentially fired boiler means a boiler that has coal and air
nozzles mounted in each corner of the furnace where the vertical furnace
walls meet. Both pulverized coal and air are directed from the furnace
corners along a line tangential to a circle lying in a horizontal plane
of the furnace.
Turbo-fired boiler means a pulverized coal, wall-fired boiler with
burners arranged on walls so that the individual flames extend down
toward the furnace bottom and then turn back up through the center of
the furnace.
Vertically fired boiler means a dry bottom boiler with circular
burners, or coal and air pipes, oriented downward and mounted on
waterwalls that are horizontal or at an angle. This definition shall
include dry bottom roof-fired boilers and dry bottom top-fired boilers,
and shall exclude dry bottom arch-fired boilers and dry bottom turbo-
fired boilers.
Wall-fired boiler means a boiler that has pulverized coal burners
arranged on the walls of the furnace. The burners have discrete,
individual flames that extend perpendicularly into the furnace area.
Wet bottom means that the ash is removed from the furnace in a
molten state. The term ``wet bottom boiler'' shall include: wet bottom
wall-fired boilers, including wet bottom turbo-
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fired boilers; and wet bottom boilers otherwise meeting the definition
of vertically fired boilers, including wet bottom arch-fired boilers,
wet bottom roof-fired boilers, and wet bottom top-fired boilers. The
term ``wet bottom boiler'' shall exclude cyclone boilers and
tangentially fired boilers.
[60 FR 18761, Apr. 13, 1995, as amended at 61 FR 67162, Dec. 19, 1996]