Delta Energy Center (Calpine/Bechtel Pittsburg) Power Plant Project - Notices & Announcements Page

STATE OF CALIFORNIA
State Energy Resources
Conservation and Development Commission


  In the Matter of:               )    Docket No. 98-AFC-3C
                                  )    Order No. 
  Delta Energy Center, LLC        )
  the Owners and Operators of     )    ORDER APPROVING a Petition
  DELTA ENERGY CENTER             )    to Amend Start-Up and Tuning
                                  )    Emissions
__________________________________)



Delta Energy Center, LLC /operator of the Delta Energy Center power plant (DEC) has requested approval to modify various Air Quality Conditions of Certification to reflect a change in the cold start-up and tuning emissions.

The Energy Commission approves DEC's amendment and the modified conditions in accordance with Title 20, Section 1769 (a) (3) of the California Code of Regulations.

COMMISSION FINDINGS

Based on staff's analysis, the Energy Commission concludes that the proposed changes will not result in any significant impact to public health and safety, or the environment. The Energy Commission finds that:

  1. There will be no new or additional unmitigated significant environmental impacts associated with the proposed change since the daily, quarterly and annual emissions limits are not changing.


  2. The facility will remain in compliance with all applicable laws, ordinances, regulations, and standards.


  3. The modification will be beneficial to the project owner in that it will allow them to comply with the conditions of certification for this project.


  4. At the time the Application for Certification was filed, the applicant believed that mass emission rates during turbine cold startup and tuning would be low enough to comply with the normal operating limits. Therefore, no separate mass-based emissions limits were requested for the startup and tuning process. During the performance testing of the new gas turbines, the operators determined that during startup and tuning, the turbines cannot comply with the existing hourly mass emissions limits for NOx, and need separate limitations for the startup and tuning processes.

CONCLUSION AND ORDER

As a result of the needed modifications to emissions limitations, the Bay Area Air Pollution control District has made changes to existing district permit conditions that are consistent with staff's modified Conditions of Certification below.

The California Energy Commission hereby adopts the following changes to the Delta Energy Center Decision:

CHANGES TO AIR QUALITY CONDITIONS OF CERTIFICATION

(New language is shown as bold and underlined, deleted language is shown as strikethrough.)

Definitions: Add the following definitions to the Definitions Section

Steam Turbine Cold Start-up Period: The lesser of the first 360 minutes of continuous fuel flow to the gas turbine after fuel flow is initiated or the period of time from gas turbine fuel flow initiation until the gas turbine achieves two consecutive CEM data points in compliance with the emission concentration limits of conditions 27(b) and 27(d), following a steam turbine shut down of at least 72 hours.

Combustor Tuning Activities: Any testing, adjustment, tuning, and calibration activities recommended by the gas turbine manufacturer to insure safe and reliable steady state operation of the gas turbines following replacement of the combustor components, during seasonal tuning events, when recommended by the turbine manufacturer, or as necessary to maintain low emissions performance. This includes, but is not limited to, adjusting the amount of fuel distributed between the combustion turbine's staged fuel systems to simultaneously minimize NOx and CO production while minimizing combustor dynamics and ensuring combustor stability.

Combustor Tuning Period: The period, not to exceed 360 minutes, during which combustor tuning activities are taking place.

Revised Conditions of Certification:

AQ-27

The owner/operator shall ensure that the Gas Turbines (S-1, S-3 & S-5) and HRSGs (S-2, S-4, & S-6) shall comply with requirements (a) through (h) under all operating scenarios, including duct burner firing mode and steam injection power augmentation mode. Requirements (a) through (h) do not apply during a gas turbine start-up or shutdown, a steam turbine cold start-up, or a gas turbine combustor tuning period. (BACT, PSD, and Toxic Risk Management Policy) All other parts of this condition of certification remain unchanged.

AQ-28

The owner/operator shall ensure that the regulated air pollutant mass emission rates from each of the Gas Turbines (S-1, S-3 and S-5) during a start-up or a shutdown, or during a combustor tuning period do not exceed the limits established below (PSD).



Start-Up



(lb./start-up)

Steam Turbine Cold
Start-up or Combustor
Tuning Periods


(lb./period)

Shutdown



(lb./shutdown)

Oxides of Nitrogen (as NO2) 240 300 80
Carbon Monoxide (CO) 2,514 9,750 902
Precursor Organic Compounds (as CH4) 48 96 16

All other parts of this condition of certification remain unchanged.

AQ-29

The owner/operator shall ensure that no more than one of the Gas Turbines (S-1, S-3, & S-5) shall be in start-up mode, supporting a steam turbine cold start-up or undergoing combustor tuning at any one time. (PSD)

The total number of hours during which the gas turbines (S-1, S-3, &S-5) may be operated to support a steam turbine cold start-up or may undergo combustor tuning shall not exceed 30 hours per year per gas turbine.

Verification: In the annual/semiannual report the owner/operator shall indicate how this condition is being implemented The project owner shall report the date, time and duration of each steam turbine cold start-up or combustor tuning event during the year in the Annual and Semiannual Air Quality Reports.

AQ-48

The owner/operator shall ensure that the total combined emissions from the Gas Turbines and HRSGs (S-1, S-2, S-3, S-4, S-5 and S-6), including emissions generated during Gas Turbine start-ups and shutdowns, steam turbine cold start-ups and combustor tuning activities do not exceed the following limits during any calendar day:

All other parts of this condition of certification remain unchanged.

AQ-49

The owner/operator shall ensure that the cumulative combined emissions from the Gas Turbines and HRSGs (S-1, S-2, S-3, S-4, S-5, and S-6), including emissions generated during gas turbine start-ups and shutdowns, steam turbine cold start-ups and combustor tuning activities shall not exceed the following limits during any consecutive twelve-month period: All other parts of this condition of certification remain unchanged.

AQ-51

The owner/operator shall demonstrate compliance with conditions 20 through 23, 27(a) through 27(d), 28, 29, 32 through 34, 37(a) through 37(d), 46, 47, 48(a), 48(b), 49(a) and 49(b) by using properly operated and maintained continuous monitors (during all hours of operation including equipment start-up and shutdown and combustor tuning periods) for all of the following parameters: All other parts of this condition of certification remain unchanged.

AQ-52

To demonstrate compliance with conditions 27(f), 27(g), 27(h), 28, 48(c) through 48(e), and 49(c) through 49(e), the owner/operator shall calculate and record on a daily basis, the Precursor Organic Compound (POC) mass emissions, Fine Particulate Matter (PM10) mass emissions (including condensable particulate matter), and Sulfur Dioxide (SO2) mass emissions from each power train. The owner/operator shall use the actual Heat Input Rates calculated pursuant to condition 39, actual Gas Turbine Start-up Times, actual Gas Turbine Shutdown Times, actual steam turbine cold start-up times, actual gas turbine combustor tuning times and CEC and District-approved emission factors to calculate these emissions. The calculated emissions shall be presented as follows: All other parts of this condition of certification remain unchanged.

AQ-61

The owner/operator of the DEC shall maintain all records and reports on site for a minimum of 5 years. These records shall include but are not limited to: continuous monitoring records (firing hours, fuel flows, emission rates, monitor excesses, breakdowns, etc.), source test and analytical records, natural gas sulfur content analysis results, emission calculation records, records of steam turbine cold start-up and gas turbine combustor tuning activities, records of plant upsets and related incidents. The owner/operator shall make all records and reports available to District and the CEC CPM staff upon request. (Regulation 2-6-501)

Verification: During site inspection, the owner/operator shall make all records and reports available to the District, ARB, EPA or CEC staff.



IT IS SO ORDERED.

Date: September 8, 2004

STATE OF CALIFORNIA
ENERGY RESOURCES CONSERVATION AND
DEVELOPMENT COMMISSION





__________signed____________
WILLIAM J. KEESE, Chairman



| Back to Main Page | Commission Homepage | Site Index | Search Site | Links | Contact Us |