THE INFLUENCE OF THE HYDROGEN IN THE COMPOSITION OF NATURAL GAS UPON THE ATMOSFERIC COMBUSTION WITH LARGE EXCESS AIR

Autor/autori: Ștefan GRIGOREAN, Gheorghe DUMITRAŞCU, Michel FEIDT, Bogdan HORBANIUC

Abstract: The paper presents simulation of the atmospheric combustion of natural gas enriched with hydrogen. This combustion of the natural gas enriched with hydrogen is intended to be used in closed cycle solar hybrid gas turbine engines. The combustion considered adaptability both to the variable input solar energy and to a variable useful heat output and a constant engine power, from full cogeneration to full power. This engine operation can be assured by an external combustion with an adjustable air pre-heating. The combustion simulation, performed in ANSYS numerical codes, considered the following assumptions: - air pre-heating above 800 K, - excess air value from 3 to 5, to ensure a temperature of flame near the combustion chamber wall below 1800K, - different air primary, secondary and dilution ratios. The simulation returned results regarding: the combustion temperature field, the flame OH concentration field, the exhaust gases composition fields, the flue gases velocity field, the pressure gases pressure field. The simulation showed the influence of the air pre-heating temperature upon the atmospheric combustion spatial parameters.

Keywords: simulation, atmospheric combustion, natural gas enriched with hydrogen, air high preheating, combustion parameters

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