Energy and greenhouse gases

CO₂ Emission Factors for Fuels

2014-12-31 09:40:34 | Lượt xem: 10162 | Energy and greenhouse gases

Reference CO₂ emission factors for calculating emissions and preparing energy audit reports.

Emission factors convert energy consumption into the corresponding quantity of CO₂. The table below summarises selected default factors by fuel type. Select a method and factor source appropriate to the purpose of the calculation.

English translation of the original table

Fuel	Default carbon content (kg/GJ)	Default oxidation factor	Default CO₂ factor (kg/TJ)	95% interval: lower	95% interval: upper
Gas / diesel oil	20.2	1	74,100	72,600	74,800
Residual fuel oil	21.1	1	77,400	75,500	78,800
Anthracite	26.8	1	98,300	94,600	101,000
Bituminous coals	25.8	1	94,600	89,500	99,700
Natural gas	15.3	1	56,100	54,300	58,300

Read the units correctly before calculating

The emission factors in the table are expressed in kg CO₂/TJ.
1 TJ = 1,000 GJ = 1,000,000 MJ = 1,000,000,000,000 J.
CO₂ emissions (kg) = energy consumed (TJ) × emission factor (kg CO₂/TJ).
Divide kg CO₂ by 1,000 to obtain tonnes of CO₂.

Worked conversion example

Using 10 TJ of natural gas and the factor of 56,100 kg CO₂/TJ in the table gives 561,000 kg, or 561 tonnes of CO₂. This is an arithmetic example, not the emissions data of a particular company.

Points to check when using the table

A fuel combustion factor does not replace a grid electricity emission factor. If fuel consumption is measured by mass or volume, first convert it to energy using an appropriate calorific value. CO₂ is also different from the total CO₂ equivalent of all greenhouse gases.

Reference sources: 2006 IPCC Guidelines — stationary combustion; BIPM SI prefixes.

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