wennanlong
commented
1 year ago The discussion on the new definition of the flaring oil ratio (FOR). In the prior OPGEE, the FOR is defined as the gas to flare after separation. However, Zhang’s flaring model measures FOR from the field, which means that the total flaring rate from after separation, crude oil storage tank, bitumen mining, and heavy oil upgrading. So the prior model overcounts the emissions from flaring. For instance, if turning the FOR = 0, the flaring sheet still calculates flaring emissions from the crude oil storage tank. To update the model, here is what I changed in the flaring sheet:
• The total malar composition of incoming gas (M54:M64) needs to add stream 81. • Add mass frac column from P54 to P64 • Calculate Stream 29 (L16 : L27) using the following equation: Qf, i=QoilFOR rhoixi Where: Qf, i = mass flow rate of component I to flare, [tonne/day] Qoil = oil production rate, [Bbl/day] FOR = total flaring oil ratio, [scf/Bbl] rhoi = density of component I, [tonne/mmscf] xi = mass fraction of component I, [tonne/tonne] • Calculate methane slip (Stream 298: N16 : N27) using the following equation: Qs, i=Qf, if(1-f) Where: Qs, i = gas slip mass flow rate of component I , [tonne/day] f = combusted gas total fraction, [tonne/tonne] • Update the post-flaring gas to vent (Stream 30: M16 to M27) using mass balance
In the Flaring tab, stream 298 (row 16 to row 27, Column 298) only applies the fraction of gas flared to stream 28. Please correct them accordingly. For example, Cell M16 = IF(SUM($E$28:$G$28)>0,(E16+F16+G16)$M$69(1-$M$76),0)