EC
/ AIR QUALITY BUREAU Application Log in Desk7900 Hickman Rd., Suite 1
Windsor Heights, IA 50324 / AIR CONSTRUCTION PERMIT APPLICATION
Form EC: Emission Calculations
Please see instructions on reverse side
1) Company Name:
2) Emission Point (Stack/Vent) Number: / 3) Emission Calculation (Please see instructions for proper way to calculate). This calculation is based on (check all that apply):
Emission Factors / Mass Balance / Testing Data / Other:
Calculations:
4) Potential Emissions:SUMMARY OF EMISSIONS FROM THIS EMISSION POINT
Pollutant / PM / PM10 / PM2.5 / SO2 / NOx / VOC / CO / CO2e / Lead / HAP / THAP
Concentration, (Unit):
lbs/hr
tons/year
DraftFor Assistance 1-877AIR IOWA (1-877-247-4692)DNR Form 542-0945
EC
Instructions for Form EC
This form is used by the DNR to better understand the process being permitted and to verify the emissions calculations and how they are calculated.
1.Provide company name.
2.Provide the number of the emission point that the emission unit(s) will exhaust into the atmosphere. This should be the same number as on form EP.
3.Check the appropriate box to indicate the basis for emission calculations. Emission calculations are used to verify potential compliance with the applicable standard or requested limit. Emissions calculations should compare the maximum expected emissions to any potential requested limits or any limits imposed by the regulations. Emissions estimates must bebased on maximum throughput using the appropriateemission factorand control efficiency (if applicable), a mass balance, testing data or another method as approved by DNR. A calculation based on an assumed grain loading that control equipment can meet is not an approved method of estimating emissions. For example, it is not acceptable to assume all baghouses can achieve 0.02 gr/dscf or better. Include a description of any assumptions used in making the calculations. For greenhouse gas (GHG) emission calculations, the applicant must provide an estimate of mass emissions of each individual GHG and provide on the form the calculation of total GHG emissions expressed as carbon dioxide equivalent (CO2e). If more space is needed, attach an 8.5" x 11" sheet(s) labeled EC-4A. The attached calculations must include the formulas or methods used to derive emission calculations.
Sample Calculation: This sample calculation is intended to illustrate expected emissions based on 8,760 hours of operation per year for four pollutants only. The emission unit is a natural gas fired boiler with no control that has a maximum heat input of 20 MMBtu/hr where the natural gas heating value is equivalent to 1,020 Btu/scf. Pollutant (except GHGs) emission factors are from AP 42, Fifth Edition, Volume I Chapter 1.4 Natural Gas Combustion. AP-42 emission factors for various industry types are available at WebFire and emission estimation tools such as Tanks program are located at
CO2e emissions are defined as the sum of the mass emissions of each individual GHG adjusted for each pollutant’s global warming potential (GWP). Guidance on calculating mass emissions of each individual GHG including emission factors and CO2e is available at . Since GWP values may vary for each individual GHG pollutant, applicants should use the GWP values in Table A of the GHG Form or the values in Table A-1 of the Federal Greenhouse Gas Reporting Program (GHGRP) (40 CFR Part 98, Subpart A, Table A-1).For other pollutant definitions refer to Form EI instructions number 6 and Table A of the construction permit application provides a listing of hazardous air pollutants (HAPs).
CO:20 MMBtu/hr *(1 scf/ 1,020 Btu) * (84 lbs of CO/MMscf) = 1.65 lbs of CO/hr
1.65 lbs/hr * 8760 hr/year * (1 ton/2000 lbs) = 7.22 tons of CO/year
NOx:20 MMBtu/hr * (1 scf/ 1,020 Btu) *(100 lbs of NOx/MMscf) = 2.0 lbs of NOx/hr
2.0 lbs/hr * 8760 hr/year * (1 ton/2000 lbs) = 8.76 tons of NOx/year
CO2 (Mass):20 MMBtu/hr *(116.89 lbs of CO2/MMBtu) = 2338 lbs of CO2/hr
2338 lbs/hr * 8760 hr/year * (1 ton/2000 lbs) = 10,240 tons of CO2/year
CH4 (Mass):20 MMBtu/hr * (0.0022 lbs of CH4/MMBtu) = 0.044 lbs of CH4/hr
0.044 lbs/hr * 8760 hr/year * (1 ton/2000 lbs) = 0.193 tons of CH4/year
4.Summarize the potential emission rates for each air pollutantemitted from this emission point (stack or vent). Applicants should make sure to provide the concentration unit for each pollutant. Concentration is usually expressed in grains per standard cubic feet (gr/scf) for particulate, and parts per million by volume (ppmv) or pounds per million Btu (lbs/MMBtu) for gaseous pollutants. “Potential to Emit”means the maximum capacity of a stationary source to emit pollutant under its physical and operational design. Any physical or operational limitation on the capacity of a source to emit pollutants, including control equipment and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed, shall be treated as part of its design if the limitation or the effect it would have on emissions is federally enforceable. An applicant should basepotential to emit on any requested emission limits, emission limits imposed by regulation, or by a process’s physical limitation.
DraftFor Assistance 1-877AIR IOWA (1-877-247-4692)DNR Form 542-0945