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REGULATION FOR THE MANDATORY REPORTING OF GREENHOUSE GAS EMISSIONS - page 87 / 137

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(3)

Gaseous Fuels. Operators combusting gaseous fuels shall use the following equation to calculate CO2 emissions:

12 CO2 = Fueln * CCn * 1/MVC * 3.664 * 0.001 1

Where: CO2 = carbon dioxide emissions, metric tonnes per year Fueln = volume of gaseous fuel combusted in month “n,” scf CCn = carbon content from fuel analysis for month “n,” kg C per kg-mole fuel MVC = molar volume conversion factor (849.5 scf/kg-mole for STP of 20°C and 1 atmosphere, or 836 scf/kg-mole fo r STP of 60°F and 1 atmosphere)

    • 3.664

      = conversion factor for carbon to carbon dioxide

    • 0.001

      = Factor to convert kg to metric tonnes

  • (A)

    When measured by the operator or fuel supplier, carbon content shall be determined using the following ASTM methods: ASTM D1945-03 or ASTM D1946-90 (Reapproved 2006). Except for refinery fuel gas and flexicoker derived fuel gas, the carbon content shall be measured and recorded monthly. Petroleum refiners electing to use this method to calculate CO2 emissions resulting from the combustion of refinery fuel gas shall determine refinery fuel gas carbon content (CC) a minimum of 3 times per day (every eight hours) using on-line instrumentation or discrete sample laboratory analysis. The carbon content of flexigas shall be determined once per day with either on-line instrumentation or discrete sampling and lab based analysis using one of the ASTM methods listed above. Operators shall calculate CO2 emissions for a refinery fuel gas system and flexigas combustion in the following manner:

365 CO2 = Fueln * CCAn-ave 1

  • *

    MWRFG-A

/MVC * 3.664 * 0.001

Where: CO2 = carbon dioxide emissions, metric tonnes/year FuelA = refinery fuel or flexigas from system A combusted on day n (scf) CCAn-ave = system A refinery fuel gas average daily carbon content or flexigas carbon content for day n (kg C/kg fuel) MWRFG-A = average daily molecular weight of refinery fuel gas system A or flexigas molecular weight for day n

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