NITROGEN OXIDES REDUCTION 749

Available Control Technology applies to existing sources in

nonattainment areas. RACT has been defined by the USEPA

as “the lowest emission limitation that a particular source is

capable of meeting by the application of control technology

that is reasonably available considering technological and

economic feasibility”.^9

One of the ways the CAA provides for regulation

of emissions is through the New Source Performance

Standards (NSPS), which is also a component of Title I.

The USEPA continually promulgates new standards, under

the 40 CFR Part 60’s, to regulate the emissions of criteria

pollutants from new or substantially modified stationary

sources. These new sources may also have to undergo a

New Source Review (NSR) permitting process. Under this

process, the regulating agency determines whether the

facility can begin operation and under what conditions.

The following is a list of new source performance stan-

dards that pertain to facilities that are regulated for NO x

emissions:^10

• Subpart D-Fossil Fuel Fired Steam Generators
  (facilities that began construction after 8/17/71)
  (250 MBtu/hr)^10


• The NO x emission limits are found in Table 1.


• For combinations of fuels, the following proration
  applies:

(^)
E
wx y z
n wxyz

++ +
+++
260 86 130 300
where
E n  NOx limit (ng/J heat input)
w  % of total heat input derived from lignite
x  % of total heat input derived from gaseous fossil
fuel
y  % of total heat input derived from liquid fossil
fuel
z  % of total heat input derived from solid fossil
fuel.

• Subpart Da-Electric Utility Steam Generating
  Units (facilities that began construction after
  9/18/78) (250 MBtu/hr)^10


• The NO x emission limits are found in Table 2.


• For combinations of fuels, the following proration
  applies:

(^)
E
86w 130x 210y 260z 340v
n 100

++ ++
where
E n  NO x limit (ng/J heat input)
w  % of total heat input derived from combustion of
fuels subject to the 86 ng/J heat input standard
x  % of total heat input derived from combustion of
fuels subject to the 130 ng/J heat input standard
y  % of total heat input derived from combustion of
fuels subject to the 210 ng/J heat input standard
z  % of total heat input derived from combustion of
fuels subject to the 260 ng/J heat input standard
v  % of total heat input derived from combustion of
fuels subject to the 340 ng/J heat input standard.

• Subpart Db-Industrial-Institutional Steam Gene-
  rating Units (facilities that began construction
  after 6/19/84) ( 100 MBtu/hr)^10


• The NO x emission limits are found in Table 3.


• Subpart Ea-Municipal Waste Combustors (facili-
  ties that began construction after 12/2/89) ( 250
  tons/day)^10


• 180 ppm by volume, corrected to 7% O 2 (dry
  basis).


• Subpart G-Nitric Acid Plants (facilities that began
  construction after 8/17/71)^10


• 3.0 lb NO x (as NO 2 )/ton of acid produced expressed
  as 100% nitric acid).


• Subpart GG-Stationary Gas Turbines (facilities
  that began construction after 10/3/77)^10


• The NO x emission limits for stationary gas tur-
  bines are given by two equations. For units with a
  heat input at peak load of 107.2 GJ (100 MBtu)
  per hour, the allowable NO x emission at 15% O 2 ,
  dry is given by the following equation:

(^)
E
Y
n=+0 0075 F
14 4
.
(.)
For units with a heat input peak load of 10.7 GJ (10 MBtu)
per hour but 107.2 GJ (100 MBtu) per hour and for units
with a base load at ISO conditions of 30 MW or less, the
TABLE 1
USEPA 40 CFR Part 60 Subpart D-Fossil-fuel fired steam
generators NO x emission limits^10
Fuel type
NOx emission limits, ng/J(lb/
MBtu) (expressed asNO 2 )
for heat input
(1) Gaseous fossil fuel 86 (0.20)
(2) Liquid fossil fuel 129 (0.30)
(3) Liquid fossil fuel  wood residue 129 (0.30)
(4) Gaseous fossil fuel  wood residue 129 (0.30)
(5) Solid fossil fuel^1 300 (0.70)
(6) Solid fossil fuel  wood residue^1 300 (0.70)
(7) Lignite, except (9) 260 (0.60)
(8) Lignite  wood residue, except (9) 260 (0.60)
(9) Lignite mined in North Dakota, South
Dakota, or Montana,
and which is burned in a
cyclone-fired unit
340 (0.80)
1 Except liginite or a solid fossil fuel containing 25%, by weight, or
more coal refuse.
C014_002_r03.indd 749C014_002_r03.indd 749 11/18/2005 1:26:53 PM11/18/2005 1:26:53 PM