# Anthracite coal combustion: stoker-fired boilers

The burning of anthracite coal in stoker-fired boilers results in releases of metals (Part 1 substances), polycyclic aromatic hydrocarbons (Part 2 substances) and criteria air contaminants (Part 4 substances). The calculator focusses on releases to air and uses default emission factors. It can be adapted to use site-specific emission factors if they are available.

If you want to use a site-specific emission factor, enter it in the emission factor column, but be sure to convert the units correctly.

The spreadsheet calculators use emission factors based on uncontrolled emission sources. If you use an emission control device and the default emission factor is uncontrolled, use this formula to adjust the spreadsheet calculation:

Controlled emissions = uncontrolled emission x ((100 - control efficiency)/100)

Since NPRI reporting thresholds are for the facility as a whole, you may need to combine the air releases you calculate with releases from other sources at your facility.

The following sections explain how the spreadsheet calculator works.

## Suggested estimation methodology: emission factor

The general equation for estimation using an emission factor is:

E = A x EF

where:

• E = emissions
• A = activity rate
• EF = emission factor

## Input data

A = Anthracite Coal Burned [tonnes per year]
B = Ash Content of Coal [percent]
C = Sulphur Content of Coal [percent]

## Substance releases

Substance Chemical Abstracts Service registry number (CAS RN)1 Part Emission factor (EF)2 EF units
Arsenic 7440-38-2 1 9.50E-05 kilograms (kg)/tonne
Ammonia 7664-41-7 1 0.00028 kg/tonne
Biphenyl 92-52-4 1 1.25E-02 kg/tonne
Chromium 7440-47-3 1 1.40E-02 kg/tonne
Manganese 7439-96-5 1 1.80E-03 kg/tonne
Mercury 7439-97-6 1 6.50E-05 kg/tonne
Naphthalene 91-20-3 1 6.50E-02 kg/tonne
Nickel 7440-02-0 1 1.30E-02 kg/tonne
Selenium 7782-49-2 1 6.50E-04 kg/tonne
Thallium 7440-28-0 1 1.33E-04 kg/tonne
Phenanthrene 85-01-8 2 3.40E-03 kg/tonne
Carbon monoxide (CO) 630-08-0 4 0.3 kg/tonne
Sulphur dioxide (SO2)Footnote * 7446-09-5 4 C x 19.5 kg/tonne
Oxides of nitrogen (NOx), expressed as nitrogen dioxide (NO2) 11104-93-1 4 4.5 kg/tonne
Volatile organic compounds (total) (VOCs) Footnote ***   4 0.035 kg/tonne
Total particulate matter (TPM)Footnote * Footnote ***   4 B x 0.4 kg/tonne
Particulate matter less than or equal to 10 micrometers (µm) (PM10)Footnote ** Footnote ***   4 2.4 kg/tonne
Particulate matter less than or equal to 2.5 µm (PM2.5Footnote ** Footnote ***   4 1.25 kg/tonne

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