382
11 Power Gas Turbines
one, called the pilot burner. Figure 11.10 is a picture of eight peripheral burners,
without the pilot burner. Burners are constructed for low production of noxious
combustion products, which are nitrogen oxides (NOx) and carbon monoxide
(CO). NOx forms by reactions at high temperature between nitrogen and oxygen of the air. CO forms by incomplete combustion due to lack of oxygen. For
low production of both, the combustion principles are lean premixing and staged
combustion. Traditional organisation of combustion is injecting pure fuel into air.
The (gaseous) fuel then diffuses into the air and a flame front forms where the
gas-air composition is about stoichiometric. The flame is then very stable but the
Fig. 11.10 Peripheral burners of a DLE system. (Courtesy Siemens Energy)
Fig. 11.9 Longitudinal section of a simplified Dry Low Emissions burner system ( DLE) for a
can-annular combustion chamber
11 Power Gas Turbines
one, called the pilot burner. Figure 11.10 is a picture of eight peripheral burners,
without the pilot burner. Burners are constructed for low production of noxious
combustion products, which are nitrogen oxides (NOx) and carbon monoxide
(CO). NOx forms by reactions at high temperature between nitrogen and oxygen of the air. CO forms by incomplete combustion due to lack of oxygen. For
low production of both, the combustion principles are lean premixing and staged
combustion. Traditional organisation of combustion is injecting pure fuel into air.
The (gaseous) fuel then diffuses into the air and a flame front forms where the
gas-air composition is about stoichiometric. The flame is then very stable but the
Fig. 11.10 Peripheral burners of a DLE system. (Courtesy Siemens Energy)
Fig. 11.9 Longitudinal section of a simplified Dry Low Emissions burner system ( DLE) for a
can-annular combustion chamber