This spreadsheet is intended to calculated SO2 emissions for PB1 from the combined fuels

of bark and TDF. These emission calculations take into account the SO2 removal efficiency of 

the ash from wood combustion, based on Someshwar and Jain, 1993 from TAPPI Journal Vol. 76, No. 7. 

SO2 calculations are based on equation 6 from Table 3 in Someshwar and Jain, 1993. Equation 6 was

chosen because it was a conservative estimate of the removal efficiency and included a summary of a 

mixture of different fuel types that seemed most representative of the fuels in PB1. 

Fuel oil SO2 emissions are not calculated here, but space is provided to link to fuel oil SO2 emissions

in order to summarize total SO2 emissions from PB1 on this spreadsheet. 

Cells with yellow highlight and blue text are intended for data input. Each month the usage of each of 

the combined fuels should be entered in the yellow area including bark (wet basis) and TDF. SO2

emissions from fuel oil are calculated separately. These emissions can be included in this table by link 

or by entering them each month. A running total is available for each applicable column. 

Parameters such as sulfur content of the fuels and moisture content of the bark are listed at the top of 

the table. These parameters can be changed as necessary, but in general should not need to be edited. 

Bark S content: 0.00023 X = S in combined fuels/ton of wood residue

TDF S content: 0.0211 Y1 = S emissions/ton combined fuel

Y2 = S captured

Bark moisture content: 0.41

*Apply 97.5% SO2 Removal Efficiancy of WES

Bark (wet) PB1 Bark TDF PB1 Sulfur PB1 Sulfur Combined Combined Fuel Oil TOTAL 

Usage Usage (dry) Usage from Bark from TDF X Y1 lb SO2/ton Fuel Y2 S emissions SO2 Emis SO2 Emis* SO2 Emis

(tons) (tons) (tons) (tons) (tons) (lb/ton) (lb/ton) % (tons) (tons) (tons) (tons)

Jan 13,860 8,178 499 1.88 10.53 3.03 0.951 1.902 73.8 4.12 0.21 0 0.21

Feb 6,007 3,544 213 0.82 4.49 2.99 0.933 1.867 74.3 1.75 0.09 0.09

Mar 8,003 4,722 269 1.09 5.68 2.87 0.884 1.767 75.9 2.20 0.11 0.11

Apr 3,633 2,143 107 0.49 2.25 2.56 0.761 1.522 80.3 0.86 0.04 0.04

May 10,963 6,468 324 1.49 6.84 2.57 0.767 1.534 80.1 2.60 0.13 0.13

Jun 13,113 7,736 241 1.78 5.09 1.78 0.447 0.893 96.4 1.78 0.09 0.09

Jul 11,443 6,752 376 1.55 7.93 2.81 0.861 1.722 76.7 3.07 0.15 0.15

Aug 13,436 7,927 599 1.82 12.64 3.65 1.197 2.394 67.3 5.10 0.26 0.26

Sep 23,917 14,111 1,145 3.25 24.16 3.88 1.291 2.583 65.2 9.85 0.49 0.49

Oct 7,008 4,135 220 0.95 4.65 2.71 0.821 1.642 78.1 1.79 0.09 0.09

Nov 12,549 7,404 495 1.70 10.45 3.28 1.050 2.100 70.9 4.15 0.21 0.21

Dec 3,673 2,167 148 0.50 3.12 3.34 1.072 2.143 70.3 1.24 0.06 0.06

Total 127,605 75,287 4,636 17.3 98 1.93 0.00 1.93

2013

Power Boiler #1 Sulfur Dioxide Emission Calculations

PB1 Fuel Usage PB1 SO2 Emissions

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y = 0.4005x - 0.2645

R2 = 0.8969

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#1 PB NCASI Graph Vs. SO2 Monitor Data (Regression)

NCASI Trend - S per Fuel Monitor - Emission NCASI Trend - Capture % Monitor - %Capture Power (Monitor - %Capture)