Instructional Manual For Clarification Of Startup In Source Categories Affected By New Source Performance Standards - U.s. Environmental Protection Agency - 1979 Page 50
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146 Pre-Startup Operations
As
discus~ed
previously, preparation of process equipment involves
primarily a mechanical and instrument checkout.
Startup Operations
Startup of fuel
gAR
combustion devices is initiated with a test firing.
Further information on procedures for startup of combustion devices can be
found in the discussion of boiler startup (Subpart D) •.
C.
Claus Sulfur Recovery Plants
Emissions of sulfur dioxide (S02) are limited to 0.025 percent by volume
at 0 percent oxygen (dry basis) if emissions are controlled by an oxidation
system or a reduction control system followed by incineration; or 0.030 percent
by volume of reduced sulfur compounds and 0.0010 percent by volume of hydrogen
sulfide (HzS) calculated as S02 at 0 percent oxygen (dry basis)'
i f
emissions
are controlled by a reduction control system not followed by incineration.
Continuous monitoring and recording of S02 in the gases discharged to the atmos-
phere is required if an oxidation or reduction control system followed by in-
cineration is used.
Continuous monitoring and recording of H2S and reduced
sulfur compounds in discharged gases is required if
$
reduction control system
not followed by incineration is used.
Sources constructed, reconstructed or
modified after October 4, 1976 are subject to the regulation.
Process Description
A Claus sulfur recovery plant is a process unit which recovers elemental
sulfur· from hydrogen sulfide by a vapor-phase catalytic reaction of sulfur
dioxide and hydrogen sulfide.
A typical three-stage Claus unit designed to
operate on a "standard" acid gas rich in hydrogen sulfide is shown in Figure 9.
Pre-Startup Operations
As
discussed previously for the FCC process unit, preparation of process
equipment involves the following activities:
1.
general mechanical checkout (pumps, etc.)
2.
instrument checkout
3.
confirmation of "as-built" conditions with design specifications
4.
pressure testing of welds
5.
acidize compressor lines
6.
general washout (air, nitrogen, or water):
7.
commission utilities
38
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