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On high suppression of NO x and CO emissions in gas-turbine plants with combined gas-and-steam cycles

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Abstract

In this work are given results of analyzing processes of production of nitrogen oxides (NO x ) and afterburning of CO when firing natural gas at combined-cycle gas-turbine plants. It is shown that for suppressing emissions of the said microcomponents it is necessary to lower temperature in hot local zones of the flame in which NOx is formed, and, in so doing, to avoid chilling of cold flame zones that prevents afterburning of CO. The required lowering of the combustion temperature can be provided by combustion of mixtures of methane with steam, with high mixing uniformity that ensures the same and optimum fraction of the steam “ballast” in each microvolume of the flame. In addition to chilling, the steam ballast makes it possible to maintain a fairly high concentration of hydroxil radicals in the flame zone as well, and this provides high burning out of fuel and reduction in carbon monoxide emissions (active steam ballast). Due to this fact the fraction of steam when firing its mixtures with methane in a gas-turbine plant can be increased up to the weight ratio 4: 1. In this case, the concentrations of NO x and CO in emissions can be reduced to ultra-low values (less than 3 ppm).

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Authors
  1. A. A. Ivanov
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  2. A. N. Ermakov
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  3. R. A. Shlyakhov
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Additional information

Original Russian Text © A.A. Ivanov, A.N. Ermakov, R.A. Shlyakhov, 2010, published in Izvestiya RAN. Energetika.

This work was performed within the Program No. 9 “Basic Problems of Thermal Physics and Gas Dynamics in the Development of Environmentally Friendly Combined-Cycle Power Plants of the New Generation” drawn up by the Department of Power Engineering, Machine Building, Mechanics, and Control Processes, RAS, and supported by the Russian Foundation for Basic Research (grant No. 09-08-01230-a).

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Ivanov, A.A., Ermakov, A.N. & Shlyakhov, R.A. On high suppression of NO x and CO emissions in gas-turbine plants with combined gas-and-steam cycles. Therm. Eng. 57, 1132–1138 (2010). https://doi.org/10.1134/S0040601510130070

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