PLACER COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 250 - STATIONARY GAS TURBINES
(Adopted 10-17-94)

100 GENERAL

101 PURPOSE: The purpose of this rule is to limit NOx emissions from stationary gas turbines in conformance with BARCT determinations approved by the California Air Resources Board to meet the requirements of the California Clean Air Act.

102 APPLICABILITY: Except as provided in Sections 110 and 111, this rule shall apply to all stationary gas turbines, 0.3 megawatt (MW) and larger.

110 EXEMPTION - LABORATORY, FIREFIGHTING/FLOOD CONTROL, AND PIPELINE UNITS: The provisions of this rule with the exception of Section 402.3 shall not apply to the operation of stationary gas turbines used under the following conditions:

111 EXEMPTION - EMERGENCY STANDBY AND SMALL UNITS: The provisions of this rule with the exception of Sections 402.3, 403, and 502.5 shall not apply to the operation of stationary gas turbines used under the following conditions:

 

200 DEFINITIONS

201 BARCT: "Best Available Retrofit Control Technology" as defined in Section 40406 of the California Health and Safety Code as an "emission limitation that is based on the maximum degree of reduction achievable, taking into account environmental, energy, and economic impacts by each class or category of source".

202 CHEMICAL PROCESSING GAS TURBINE UNIT: A stationary gas turbine that vents its exhaust gases into the operating stream of a chemical process.

203 COMPLIANCE LIMIT: Allowable NOx emissions expressed in parts per million by volume (ppmv).

204 CONTROL SYSTEM OPERATING PARAMETERS: Operating parameters that the Air Pollution Control Officer deems necessary to analyze when determining compliance, such as ammonia and exhaust flow rates and exhaust gas temperature for SCR; of humidity, water injection rate, exhaust gas flow rate, and temperature for water injection.

205 EMERGENCY STANDBY UNIT: A stationary gas turbine that operates only as a mechanical or electrical power source for a facility when the primary power source has been rendered inoperable due to a failure beyond the reasonable control of the operator, except due to power interruption pursuant to a voluntary interruptable power supply agreement. Electricity generated by such a unit cannot be sold.

206 HHV: The higher heating value of a fuel.

207 LHV: The lower heating value of the fuel.

208 MEASURED NOx EMISSIONS CONCENTRATION: The concentration of NOx emissions corrected to International Standards Organization (ISO) standard conditions:
 

209 NOx EMISSIONS (NOx): The sum of nitric oxides and nitrogen dioxide in the exhaust gas stream.

210 PIPELINE GAS TURBINES: A stationary gas turbine used to transport gases or liquids in a pipeline.

211 POWER AUGMENTATION: An increase in the gas turbine shaft output and/or the decrease in gas turbine fuel consumption by the addition of energy recovered from exhaust heat.

212 PUBLIC SERVICE UNIT: A gas turbine used to generate electricity for sale or for use in serving the public.

213 RATING: The continuous megawatt (MW) rating or mechanical equivalent by a manufacturer for gas turbine(s) without power augmentation.

214 SELECTIVE CATALYTIC REDUCTION (SCR): A post combustion control technology that utilizes ammonia injected into the exhaust gas stream where it reduces NOx to molecular nitrogen in the presence of a catalyst.

215 STATIONARY GAS TURBINE: Any gas turbine system that is gas and/or liquid fueled with or without power augmentation. This unit is either attached to a foundation at a facility or is portable equipment operated at a specific facility for more than 90 days in any 12-month period. Two or more gas turbines powering one shaft shall be treated as one unit.

216 THERMAL STABILIZATION PERIOD: The two hour start-up time necessary to bring the heat recovery steam generator to the proper temperature, not to exceed two (2) hours.
 

300 STANDARDS

301 LIMITATIONS: The owner or operator of any stationary gas turbine unit shall not operate such unit under load conditions, excluding the thermal stabilization period which results in the measured NOx emissions concentration exceeding the compliance limit listed below, averaged over 15 minutes:
 

Unit Size

Compliance limit 
NOx, ppm @ 15% O2

Megawatt Rating (MW)

GasA

OilB

0.3 to Less Than 2.9 MW and Units Greater Than 
or Equal to 4 MW That Operate Less Than 877 Hour/Year

42

65

2.9 to Less Than 10 MW

25 x EFF/25

65

10.0 MW and Over with SCR

9 x EFF/25

25 x EFF/25

10.0 MW and Over Without SCR

15 x EFF/25

42 x EFF/25

A. GAS INCLUDES NATURAL, DIGESTER, AND LANDFILL GASES.
B. OIL INCLUDES KEROSINE, JET, AND DISTILLATE. THE SULFUR CONTENT OF THE OIL SHALL BE LESS THAN 0.05%.
 

400 ADMINISTRATIVE REQUIREMENTS

401 COMPLIANCE SCHEDULE: Owners or operators of all gas turbines existing on the date of adoption and subject to the provisions of this rule shall comply with the applicable provisions of Section 301 in accordance with the following schedule:

402 EMISSION CONTROL PLAN: The owner or operator of any existing stationary gas turbine shall submit to the Air Pollution Control Officer for approval an Emissions Control Plan of all actions, including a schedule of increments of progress, which will be taken to meet or exceed requirements of the applicable emissions limitations in Section 301 and compliance schedule in Section 401.

403 EXEMPT UNITS AND EMERGENCY STANDBY UNITS: Exempt units and emergency standby units shall comply with the following:

500 MONITORING AND RECORDKEEPING

501 MONITORING: The owner or operator of any stationary gas turbine subject to the provisions of this rule shall perform the following actions:
501.1 Install, operate and maintain in calibration equipment, as approved by the Air Pollution Control Officer, that continuously measures and records the following:
a. Control system operating parameters;
b. Elapsed time of operation; and
c. For units of 10 MW or greater that operated more than 4000 hours per year over the last three years prior to July 13, 1994, the exhaust gas NOx concentrations corrected to ISO conditions at 15 percent oxygen on a dry basis. The NOx monitoring system shall meet EPA requirements as specified in 40 CFR Part 60, App. B, Spec.2 or other systems that are acceptable to the EPA.

502 RECORDKEEPING:

503 TEST METHODS: