326 Ind. Admin. Code 3-4-3

Current through October 23, 2024

Section 326 IAC 3-4-3 - Conversion factors

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11

Affected: IC 13-15; IC 13-17

Sec. 3.

(a) Owners or operators of emissions units subject to this article shall use the following procedures for converting monitoring data to units of the standard where necessary:

(1) The owner or operator of a fossil fuel-fired steam generator shall use the following procedures to convert gaseous emission monitoring data in parts per million (ppm) to pounds per million British thermal units (Btu) (lbs/MMBtu) where necessary:

(A) When the owner or operator of a fossil fuel-fired steam generator elects under this article to measure oxygen (O₂) in flue gases, the owner or operator shall measure the pollutant concentration and oxygen on a dry basis and use the following conversion procedure:

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(B) When the owner or operator elects under this article to measure carbon dioxide (CO₂) in flue gases, the owner or operator shall measure the pollutant concentration and the CO₂ concentration on a consistent basis (wet or dry) and use the following conversion procedure:

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(C) When the owner or operator elects under this article to measure sulfur dioxide (SO₂) or nitrogen oxides (NO_x) in the flue gases, the owner or operator shall measure the diluent concentration and the SO₂ or the NO_x concentration on a wet basis and use the following conversion procedure, except where wet scrubbers are employed or where moisture is otherwise added to the stack gases:

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(D) When the owner or operator elects under this article to measure SO₂ or NO_x in the flue gases, the owner or operator shall measure the diluent concentration and the SO₂ or the NO_x concentration on a wet basis and use the following conversion procedure, where wet scrubbers or moisture is otherwise present in the stack gases, provided water vapor content of the stack gas is measured at least once every fifteen (15) minutes at the same point as the pollutant and oxygen measurements are made:

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(E) The values used in the equations under this subdivision are derived as follows:

C_ws = Pollutant concentration at stack conditions in grams per wet standard cubic meter (g/wscm) or pounds per wet standard cubic meter (lbs/wscm), determined by multiplying the average concentration in parts per million (ppm) for each one (1) hour period by 4.15 × 10^-5 M g/wscm per ppm or 2.59 × 10^-9 M lbs/wscm per ppm, where M is pollutant molecular weight in grams per gram-mole (g/g-mole) or pounds per pound-mole (lb/lb-mole).

M = 64.07 for SO₂ and 46.01 for oxides of nitrogen (NO_x) as NO₂.

C = Pollutant concentration at stack conditions in pounds per dry standard cubic meter (lbs/dscm) or grams per dry standard cubic meter (g/dscm).

F, F_c = A factor representing a ratio of the volume of dry flue gases generated to the calorific value of the fuel combusted (F), and a factor representing a ratio of the volume of carbon dioxide generated to the calorific value of the fuel combusted (F_c), respectively. Values of F and F_c are given in 40 CFR 60, Appendix A, Method 19*, as applicable.

F_w = A factor representing a ratio of the volume of wet flue gases generated to the calorific value of the fuel combusted. Values of F_w are given in 40 CFR 60, Appendix A, Method 19*.

B_wa = Proportion by volume of water vapor in the ambient air.

B_ws = Proportion by volume of water vapor in the stack gas.

E = Pollutant emission, lbs/MMBtu.

Percent O₂,

percent CO₂ = Oxygen or carbon dioxide volume (expressed as percent) determined with equipment specified under this article.

Percent O_2ws = Oxygen volume (expressed as percent) measurements made at stack conditions on a wet basis.

(2) For sulfuric acid plants, the owner or operator shall:

(A) establish a conversion factor three (3) times daily according to the procedures of 40 CFR 60.84(b) *;

(B) multiply the conversion factor by the average sulfur dioxide (SO₂) concentration in the flue gases to obtain average SO₂ emissions in pounds per ton (lbs/ton); and

(C) report the average sulfur dioxide emissions for each three (3) hour period in excess of the emission standard set forth in 326 IAC 7 in the quarterly report.

(b) The department may approve alternate procedures for computing emission averages that do not require integration of data or alternative methods of converting pollutant concentration measurements to units of the emission standard if the owner or operator shows that the alternate procedures are at least as accurate as those in this rule.

*These documents are incorporated by reference. Copies may be obtained from the Government Printing Office, 732 North Capitol Street NW, Washington, D.C. 20401 or are available for review and copying at the Indiana Department of Environmental Management, Office of Air Quality, Indiana Government Center North, Tenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

326 IAC 3-4-3

Air Pollution Control Board; 326 IAC 3-4-3; filed Jan 30, 1998, 4:00 p.m.: 21 IR 2063; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; errata filed Dec 12, 2002, 3:35 p.m.: 26 IR 1566; filed Aug 26, 2004, 11:30 a.m.: 28 IR 31; filed Aug 11, 2011, 1:54 p.m.: 20110907-IR-326050330FRA