Small Gas Turbine Emissions
Small-scale gas turbines are likely to become more widely used in CHP packages over the next few years. As with gas engines, their manufacture and supply are likely to be on a worldwide basis, and they will meet the stringent emissions standards that will apply to them in some countries. There are currently no UK emissions standards for the small-scale gas turbines used in packaged CHP.
Small-scale gas turbines produce very clean exhaust gases, with extremely low oxides of nitrogen and carbon monoxide emissions: oxides of nitrogen emissions are typically around one tenth of the levels emitted by gas engines (see table below). This allows the exhaust gases to be used directly for process applications, for heating and for carbon dioxide enrichment in greenhouses. The exhaust gases contain around 15% oxygen, which also allows them to be used as a combustion air supply to other fuel burning plant.
Typical emissions from small-scale gas turbines | ||||
Carbon dioxide (g/kWh) | Oxides of nitrogen (g/kWh) | Carbon monoxide (g/kWh) | Sulphur dioxide (g/kWh) | |
| Firing on natural gas | 700-800 | 0.2-0.5 | 0.1 | Nil |
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