Air Emissions & Gas Calculators

Balances complete combustion for a user-entered fuel composition: element totals, stoichiometric oxygen as C + H/4 + S - O/2, and the CO2, H2O, SO2, residual O2 and inert products at either a specified excess air or an excess air inferred from a measured dry O2. It is a stoichiometric screen, not a combustion or emissions determination.

Computes mixture molecular weight, specific gas constant and density from a user-entered gas composition: mole fractions from entered amounts, Mmix as the mole-weighted sum, and rho = P*Mmix/(Z*Ru*T). Entries may be required to sum to unity or normalised from any positive total. Component properties stay user inputs, so it is a gas-basis calculator rather than a property database.

Accounts annual emissions through a serial control train: uncontrolled mass entered directly or as activity times a user-entered emission factor, then each stage removing capture x effectiveness x reduction efficiency of its inlet and passing the remainder on. Control performance stays a user input; it is a mass-balance accounting aid, not a permit calculation.

Applies the dry-basis oxygen reference correction, factor (20.9 - Oref)/(20.9 - Omeas), forward or in reverse. The correction is dimensionless so the concentration unit is unchanged. It is an arithmetic correction, not a determination of which reference oxygen a rule requires.

Converts a gas pollutant between ppmv and mass concentration through the ideal-gas molar density P/(RT) and a user-entered molecular weight, then multiplies by volumetric flow on the same gas basis to give a mass emission rate. It is a unit and basis conversion; it supplies no emission factors.

Converts a stack-gas volumetric flow between wet and dry bases and normalises it to user-entered reference conditions: the dry fraction is one minus the water-vapour fraction, and the reference factor is (Pa/Pr)(Tr/Ta). It is a basis conversion, not a flow measurement or a stack-test method.