40 CFR 60.48Da - Compliance provisions.

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TITLE 40 - PROTECTION OF ENVIRONMENT

CHAPTER I - ENVIRONMENTAL PROTECTION AGENCY

SUBCHAPTER C - AIR PROGRAMS

PART 60 - STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES

subpart da - STANDARDS OF PERFORMANCE FOR ELECTRIC UTILITY STEAM GENERATING UNITS FOR WHICH CONSTRUCTION IS COMMENCED AFTER SEPTEMBER 18, 1978

60.48Da - Compliance provisions.

  (a) Compliance with the particulate matter emission limitation under 60.42Da(a)(1) constitutes compliance with the percent reduction requirements for particulate matter under 60.42Da(a)(2) and (3).

  (b) Compliance with the nitrogen oxides emission limitation under 60.44Da(a) constitutes compliance with the percent reduction requirements under 60.44Da(a)(2).

  (c) The particulate matter emission standards under 60.42Da, the nitrogen oxides emission standards under 60.44Da, and the Hg emission standards under 60.45Da apply at all times except during periods of startup, shutdown, or malfunction.

  (d) During emergency conditions in the principal company, an affected facility with a malfunctioning flue gas desulfurization system may be operated if sulfur dioxide emissions are minimized by: (1) Operating all operable flue gas desulfurization system modules, and bringing back into operation any malfunctioned module as soon as repairs are completed, (2) Bypassing flue gases around only those flue gas desulfurization system modules that have been taken out of operation because they were incapable of any sulfur dioxide emission reduction or which would have suffered significant physical damage if they had remained in operation, and (3) Designing, constructing, and operating a spare flue gas desulfurization system module for an affected facility larger than 365 MW (1,250 million Btu/hr) heat input (approximately 125 MW electrical output capacity). The Administrator may at his discretion require the owner or operator within 60 days of notification to demonstrate spare module capability. To demonstrate this capability, the owner or operator must demonstrate compliance with the appropriate requirements under paragraph (a), (b), (d), (e), and (h) under 60.43Da for any period of operation lasting from 24 hours to 30 days when: (i) Any one flue gas desulfurization module is not operated, (ii) The affected facility is operating at the maximum heat input rate, (iii) The fuel fired during the 24-hour to 30-day period is representative of the type and average sulfur content of fuel used over a typical 30-day period, and (iv) The owner or operator has given the Administrator at least 30 days notice of the date and period of time over which the demonstration will be performed.

  (e) After the initial performance test required under 60.8, compliance with the sulfur dioxide emission limitations and percentage reduction requirements under 60.43Da and the nitrogen oxides emission limitations under 60.44Da is based on the average emission rate for 30 successive boiler operating days. A separate performance test is completed at the end of each boiler operating day after the initial performance test, and a new 30 day average emission rate for both sulfur dioxide and nitrogen oxides and a new percent reduction for sulfur dioxide are calculated to show compliance with the standards.

  (f) For the initial performance test required under 60.8, compliance with the sulfur dioxide emission limitations and percent reduction requirements under 60.43Da and the nitrogen oxides emission limitation under 60.44Da is based on the average emission rates for sulfur dioxide, nitrogen oxides, and percent reduction for sulfur dioxide for the first 30 successive boiler operating days. The initial performance test is the only test in which at least 30 days prior notice is required unless otherwise specified by the Administrator. The initial performance test is to be scheduled so that the first boiler operating day of the 30 successive boiler operating days is completed within 60 days after achieving the maximum production rate at which the affected facility will be operated, but not later than 180 days after initial startup of the facility.

  (g) Compliance is determined by calculating the arithmetic average of all hourly emission rates for SO2 and NOX for the 30 successive boiler operating days, except for data obtained during startup, shutdown, malfunction (NOX only), or emergency conditions (SO2 only). Compliance with the percentage reduction requirement for SO2 is determined based on the average inlet and average outlet SO2 emission rates for the 30 successive boiler operating days.

  (h) If an owner or operator has not obtained the minimum quantity of emission data as required under 60.49Da of this subpart, compliance of the affected facility with the emission requirements under 60.43Da and 60.44Da of this subpart for the day on which the 30-day period ends may be determined by the Administrator by following the applicable procedures in section 7 of Method 19.

  (i) Compliance provisions for sources subject to 60.44Da(d)(1). The owner or operator of an affected facility subject to 60.44Da(d)(1) (new source constructed after July 7, 1997) shall calculate NOX emissions by multiplying the average hourly NOX output concentration, measured according to the provisions of 60.49Da(c), by the average hourly flow rate, measured according to the provisions of 60.49Da(l), and divided by the average hourly gross energy output, measured according to the provisions of 60.49Da(k).

  (j) Compliance provisions for duct burners subject to 60.44Da(a)(1). To determine compliance with the emissions limits for NOX required by 60.44a(a) for duct burners used in combined cycle systems, either of the procedures described in paragraph (j)(1) or (2) of this section may be used: (1) The owner or operator of an affected duct burner shall conduct the performance test required under 60.8 using the appropriate methods in appendix A of this part. Compliance with the emissions limits under 60.44Da(a)(1) is determined on the average of three (nominal 1-hour) runs for the initial and subsequent performance tests. During the performance test, one sampling site shall be located in the exhaust of the turbine prior to the duct burner. A second sampling site shall be located at the outlet from the heat recovery steam generating unit.

Measurements shall be taken at both sampling sites during the performance test; or (2) The owner or operator of an affected duct burner may elect to determine compliance by using the continuous emission monitoring system specified under 60.49Da for measuring NOX and oxygen and meet the requirements of 60.49a. Data from a CEMS certified (or recertified) according to the provisions of 40 CFR 75.20, meeting the QA and QC requirements of 40 CFR 75.21, and validated according to 40 CFR 75.23 may be used. The sampling site shall be located at the outlet from the steam generating unit. The NOX emission rate at the outlet from the steam generating unit shall constitute the NOX emission rate from the duct burner of the combined cycle system.

  (k) Compliance provisions for duct burners subject to 60.44Da(d)(1). To determine compliance with the emissions limits for NOX required by 60.44Da(d)(1) for duct burners used in combined cycle systems, either of the procedures described in paragraphs (k)(1) and (2) of this section may be used: (1) The owner or operator of an affected duct burner used in combined cycle systems shall determine compliance with the NOX standard in 60.44Da(d)(1) as follows: (i) The emission rate (E) of NOX shall be computed using Equation 1 of this section: E = [(Csg Qsg)(Cte Qte)]/(Osg h) (Eq. 1) Where: E = emission rate of NOX from the duct burner, ng/J (lb/Mwh) gross output Csg = average hourly concentration of NOX exiting the steam generating unit, ng/dscm (lb/dscf) Cte = average hourly concentration of NOX in the turbine exhaust upstream from duct burner, ng/dscm (lb/dscf) Qsg = average hourly volumetric flow rate of exhaust gas from steam generating unit, dscm/hr (dscf/hr) Qte = average hourly volumetric flow rate of exhaust gas from combustion turbine, dscm/hr (dscf/hr) Osg = average hourly gross energy output from steam generating unit, J (Mwh) h = average hourly fraction of the total heat input to the steam generating unit derived from the combustion of fuel in the affected duct burner (ii) Method 7E of appendix A of this part shall be used to determine the NOX concentrations (Csg and Cte). Method 2, 2F or 2G of appendix A of this part, as appropriate, shall be used to determine the volumetric flow rates (Qsg and Qte) of the exhaust gases. The volumetric flow rate measurements shall be taken at the same time as the concentration measurements.

  (iii) The owner or operator shall develop, demonstrate, and provide information satisfactory to the Administrator to determine the average hourly gross energy output from the steam generating unit, and the average hourly percentage of the total heat input to the steam generating unit derived from the combustion of fuel in the affected duct burner.

  (iv) Compliance with the emissions limits under 60.44Da (d)(1) is determined by the three-run average (nominal 1-hour runs) for the initial and subsequent performance tests.

  (2) The owner or operator of an affected duct burner used in a combined cycle system may elect to determine compliance with the NOX standard in 60.44Da(d)(1) on a 30-day rolling average basis as indicated in paragraphs (k)(2)(i) through (iv) of this section.

  (i) The emission rate (E) of NOX shall be computed using Equation 2 of this section: E = (Csg Qsd) /Occ (Eq. 2) Where: E = emission rate of NOX from the duct burner, ng/J (lb/Mwh) gross output Csg = average hourly concentration of NOX exiting the steam generating unit, ng/dscm (lb/dscf) Qsg = average hourly volumetric flow rate of exhaust gas from steam generating unit, dscm/hr (dscf/hr) Occ = average hourly gross energy output from entire combined cycle unit, J (Mwh) (ii) The continuous emissions monitoring system specified under 60.49Da for measuring NOX and oxygen shall be used to determine the average hourly NOX concentrations (Csg). The continuous flow monitoring system specified in 60.49Da(l) shall be used to determine the volumetric flow rate (Qsg) of the exhaust gas. The sampling site shall be located at the outlet from the steam generating unit. Data from a continuous flow monitoring system certified (or recertified) following procedures specified in 40 CFR 75.20, meeting the quality assurance and quality control requirements of 40 CFR 75.21, and validated according to 40 CFR 75.23 may be used.

  (iii) The continuous monitoring system specified under 60.49Da(k) for measuring and determining gross energy output shall be used to determine the average hourly gross energy output from the entire combined cycle unit (Occ), which is the combined output from the combustion turbine and the steam generating unit.

  (iv) The owner or operator may, in lieu of installing, operating, and recording data from the continuous flow monitoring system specified in 60.49Da(l), determine the mass rate (lb/hr) of NOX emissions by installing, operating, and maintaining continuous fuel flowmeters following the appropriate measurements procedures specified in appendix D of 40 CFR part 75. If this compliance option is selected, the emission rate (E) of NOX shall be computed using Equation 3 of this section: E = (ERsg Hcc) /Occ (Eq. 3) Where: E = emission rate of NOX from the duct burner, ng/J (lb/Mwh) gross output ERsg = average hourly emission rate of NOX exiting the steam generating unit heat input calculated using appropriate F-factor as described in Method 19, ng/J (lb/million Btu) Hcc = average hourly heat input rate of entire combined cycle unit, J/hr (million Btu/hr) Occ = average hourly gross energy output from entire combined cycle unit, J (Mwh) (3) When an affected duct burner steam generating unit utilizes a common steam turbine with one or more affected duct burner steam generating units, the owner or operator shall either: (i) Determine compliance with the applicable NOX emissions limits by measuring the emissions combined with the emissions from the other unit(s) utilizing the common steam turbine; or (ii) Develop, demonstrate, and provide information satisfactory to the Administrator on methods for apportioning the combined gross energy output from the steam turbine for each of the affected duct burners. The Administrator may approve such demonstrated substitute methods for apportioning the combined gross energy output measured at the steam turbine whenever the demonstration ensures accurate estimation of emissions regulated under this part.

  (l) Compliance provisions for sources subject to 60.45Da. The owner or operator of an affected facility subject to 60.45Da (new sources constructed or reconstructed after January 30, 2004) shall calculate the Hg emission rate (lb/MWh) for each calendar month of the year, using hourly Hg concentrations measured according to the provisions of 60.49Da(p) in conjunction with hourly stack gas volumetric flow rates measured according to the provisions of 60.49Da(l) or (m), and hourly gross electrical outputs, determined according to the provisions in 60.49Da(k). Compliance with the applicable standard under 60.45a is determined on a 12-month rolling average basis.

[44 FR 33613, June 11, 1979, as amended at 54 FR 6664, Feb. 14, 1989; 63 FR 49454, Sept. 16, 1998; 66 FR 18552, Apr. 10, 2001; 66 FR 31178, June 11, 2001. Redesignated and amended at 70 FR 28653, 28654, May 18, 2005, and further redesignated and amended at 70 FR 51268, Aug. 30, 2005]

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