FIELD: fire-fighting facilities. SUBSTANCE: compression in compressor, stepped heat supply in combustion chambers, expansion on turbines and stepped heat removal into second circuit in heat exchangers are provided in first circuit. First heat supply and first heat removal operations are carried out at least once in first circuit before starting the compression to provided neutral gas at outlet of main combustion chamber. At following heat removal operations cooling is carried out before expansion on low pressure turbine. EFFECT: production of neutral gas from ambient air on industrial scale. 3 dwg
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