Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 18
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146 FOSSIL FUEL-FIRED STEAM GENERATORS -
SUBPAR~
D
§
60 • 40 - 60. 46
Introduction
The NSPS 'for this category encompasses fossil fuel-fired or fossil fuel
and wood residue-fired steam generating units capable of operating at greater
than 73 MW (250
x
10 6 Btu/hr) heat input.
Performance standards were pro-
mulgated for nitrogen oxides, particulate matter, sulfur dioxide, and opacity.
Sulfur dioxide and nitrogen oxides are regulated according to the type of
fuel fired, (i.e., gaseous, liquid, or solid fuels).
Particulate matter is
limited to 43 ng/J (0.11b/10
G
Btu) input.
Opacity is limited to 20 percent
except for one 6 ... minute period/hr during which the opacity cannot exceed 27
percent.
Continuous monitoring is required for S02, NO x , and opacity.
Sources constructed, reconstructed or modified after August 17, 1971, are
subject to' the standard with one exception; the effective date for the NOx
provisions for lignite-fired units is December 22, 1976; all other provisions
apply to lignite-fired units constructed, reconstructed or modified after
August 17, 1971.
Process Descriptlon
F08sil-fuel is defined in 40 CFR §60.41(b) as natural gas, petroleum, coal,
and any form of solid, liquid, or gaseous fuel derived from such materials.
These fuels are combusted to create heat in the boilers for the production
of steam.
The steam, in turn, is used, in the case of an industrial facility,
to provide heat and hot water, or to run process equipment, and, in the case
of an electrical utility, to drive multi-stage turbines that produce elec-
tricity for sale to regional power networks.
See Figure 1.
Pre-Startup Operations
Prior to startup, certain
oper~tions
are undertaken to ready the boiler
for service.
These "shakedown" procedures are necessary to protect pressure
parts against corrosion, overheating, and thermal stresses; prevent furnace
explosions; to check for leaks; and irisure the on-line availability of the unit.
Some of the operations which are included in the pre-startup category
include:
1.
Filling the boiler and boi10ut to test components with respect to
temperature, mechanical stresses, corrosion resistance, structural soundness,
warping, gasketing, and expansion joints;
2.
Curing of refractory material in the boiler and stack and any coatings
present on heat exchanger surfaces;
6
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