Gas or liquid fuel-fired stationary internal combustion reciprocating
engines or gas turbines that operate in compliance with the following conditions
of this section are permitted by rule.
(1) The facility shall be registered by submitting the commission's
Form PI-7, Table 29 for each proposed reciprocating engine, and Table 31 for
each proposed gas turbine to the commission's Office of Permitting, Remediation,
and Registration in Austin within ten days after construction begins. Engines
and turbines rated less than 240 horsepower (hp) need not be registered, but
must meet paragraphs (5) and (6) of this section, relating to fuel and protection
of air quality. Engine hp rating shall be based on the engine manufacturer's
maximum continuous load rating at the lesser of the engine or driven equipment's
maximum published continuous speed. A rich-burn engine is a gas-fired spark-ignited
engine that is operated with an exhaust oxygen content less than 4.0% by volume.
A lean-burn engine is a gas-fired spark-ignited engine that is operated with
an exhaust oxygen content of 4.0% by volume, or greater.
(2) For any engine rated 500 hp or greater, subparagraphs (A)
- (C) of this paragraph shall apply.
(A) The emissions of nitrogen oxides (NO
x ) shall not exceed the following limits:
(i) 2.0 grams per horsepower-hour (g/hp-hr) under all operating
conditions for any gas-fired rich-burn engine;
(ii) 2.0 g/hp-hr at manufacturer's rated full load and speed,
and other operating conditions, except 5.0 g/hp-hr under reduced speed, 80-100%
of full torque conditions, for any spark-ignited, gas-fired lean-burn engine,
or any compression-ignited dual fuel-fired engine manufactured new after June
18, 1992;
(iii) 5.0 g/hp-hr under all operating conditions for any spark-ignited,
gas-fired, lean-burn two-cycle or four-cycle engine or any compression-ignited
dual fuel-fired engine rated 825 hp or greater and manufactured after September
23, 1982, but prior to June 18, 1992;
(iv) 5.0 g/hp-hr at manufacturer's rated full load and speed
and other operating conditions, except 8.0 g/hp-hr under reduced speed, 80-100%
of full torque conditions for any spark-ignited, gas-fired, lean-burn four-cycle
engine, or any compression-ignited dual fuel-fired engine that:
(I) was manufactured prior to June 18, 1992, and is rated less
than 825 hp; or
(II) was manufactured prior to September 23, 1982;
(v) 8.0 g/hp-hr under all operating conditions for any spark-ignited,
gas-fired, two-cycle lean-burn engine that:
(I) was manufactured prior to June 18, 1992, and is rated less
than 825 hp; or
(II) was manufactured prior to September 23, 1982;
(vi) 11.0 g/hp-hr for any compression-ignited liquid-fired
engine.
(B) For such engines which are spark-ignited gas-fired or
compression-ignited dual fuel-fired, the engine shall be equipped as necessary
with an automatic air-fuel ratio (AFR) controller which maintains AFR in the
range required to meet the emission limits of subparagraph (A) of this paragraph.
An AFR controller shall be deemed necessary for any engine controlled with
a non-selective catalytic reduction (NSCR) converter and for applications
where the fuel heating value varies more than ± 50 British thermal
unit/standard cubic feet from the design lower heating value of the fuel.
If an NSCR converter is used to reduce NOx , the
automatic controller shall operate on exhaust oxygen control.
(C) Records shall be created and maintained by the owner or
operator for a period of at least two years, made available, upon request,
to the commission and any local air pollution control agency having jurisdiction,
and shall include the following:
(i) documentation for each AFR controller, manufacturer's,
or supplier's recommended maintenance that has been performed, including replacement
of the oxygen sensor as necessary for oxygen sensor-based controllers. The
oxygen sensor shall be replaced at least quarterly in the absence of a specific
written recommendation;
(ii) documentation on proper operation of the engine by recorded
measurements of NOx and carbon monoxide (CO)
emissions as soon as practicable, but no later than seven days following each
occurrence of engine maintenance which may reasonably be expected to increase
emissions, changes of fuel quality in engines without oxygen sensor-based
AFR controllers which may reasonably be expected to increase emissions, oxygen
sensor replacement, or catalyst cleaning or catalyst replacement. Stain tube
indicators specifically designed to measure NOx
and CO concentrations shall be acceptable for this documentation, provided
a hot air probe or equivalent device is used to prevent error due to high
stack temperature, and three sets of concentration measurements are made and
averaged. Portable NOx and CO analyzers shall
also be acceptable for this documentation;
(iii) documentation within 60 days following initial engine
start-up and biennially thereafter, for emissions of NO
x and CO, measured in accordance with United States Environmental
Protection Agency (EPA) Reference Method 7E or 20 for NO
x and Method 10 for CO. Exhaust flow rate may be determined from measured
fuel flow rate and EPA Method 19. California Air Resources Board Method A-100
(adopted June 29, 1983) is an acceptable alternate to EPA test methods. Modifications
to these methods will be subject to the prior approval of the Source and Mobile
Monitoring Division of the commission. Emissions shall be measured and recorded
in the as-found operating condition; however, compliance determinations shall
not be established during start-up, shutdown, or under breakdown conditions.
An owner or operator may submit to the appropriate regional office a report
of a valid emissions test performed in Texas, on the same engine, conducted
no more than 12 months prior to the most recent start of construction date,
in lieu of performing an emissions test within 60 days following engine start-up
at the new site. Any such engine shall be sampled no less frequently than
biennially (or every 15,000 hours of elapsed run time, as recorded by an elapsed
run time meter) and upon request of the executive director. Following the
initial compliance test, in lieu of performing stack sampling on a biennial
calendar basis, an owner or operator may elect to install and operate an elapsed
operating time meter and shall test the engine within 15,000 hours of engine
operation after the previous emission test. The owner or operator who elects
to test on an operating hour schedule shall submit in writing, to the appropriate
regional office, biennially after initial sampling, documentation of the actual
recorded hours of engine operation since the previous emission test, and an
estimate of the date of the next required sampling.
(3) For any gas turbine rated 500 hp or more, subparagraphs
(A) and (B) of this paragraph shall apply.
(A) The emissions of NOx shall
not exceed 3.0 g/hp-hr for gas-firing.
(B) The turbine shall meet all applicable NO
x and sulfur dioxide (SO2) (or fuel sulfur)
emissions limitations, monitoring requirements, and reporting requirements
of EPA New Source Performance Standards Subpart GG--Standards of Performance
for Stationary Gas Turbines. Turbine hp rating shall be based on turbine
base load, fuel lower heating value, and International Standards Organization
Standard Day Conditions of 59 degrees Fahrenheit, 1.0 atmosphere and 60% relative
humidity.
(4) Any engine or turbine rated less than 500 hp or used for
temporary replacement purposes shall be exempt from the emission limitations
of paragraphs (2) and (3) of this section. Temporary replacement engines or
turbines shall be limited to a maximum of 90 days of operation after which
they shall be removed or rendered physically inoperable.
(5) Gas fuel shall be limited to: sweet natural gas or liquid
petroleum gas, fuel gas containing no more than ten grains total sulfur per
100 dry standard cubic feet, or field gas. If field gas contains more than
1.5 grains hydrogen sulfide or 30 grains total sulfur compounds per 100 standard
cubic feet (sour gas), the engine owner or operator shall maintain records,
including at least quarterly measurements of fuel hydrogen sulfide and total
sulfur content, which demonstrate that the annual SO
2 emissions from the facility do not exceed 25 tons per year (tpy).
Liquid fuel shall be petroleum distillate oil that is not a blend containing
waste oils or solvents and contains less than 0.3% by weight sulfur.
(6) There will be no violations of any National Ambient Air
Quality Standard (NAAQS) in the area of the proposed facility. Compliance
with this condition shall be demonstrated by one of the following three methods:
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