| Résumé | With the increasingly strict pollutant emission standards of natural gas industrial boilers, it is difficult to meet the existing demand by adopting one single technology to control pollutant emissions. In order to improve the combustion thermal efficiency and control pollutant emissions, this paper proposes a co-production scheme of natural gas oxy-fuel humidified combustion and replacement of natural gas hydrate (NGH) with flue gas based on the combined technical route of oxy-fuel combustion, humidified combustion and low NOx combustion. Through the numerical simulation of natural gas premixed steam combustion, the optimum steam premixed ratio is determined to be Rf=0.33. On this basis, the effects of different flue gas recirculation ratios and excess air coefficients on natural gas humidified combustion characteristics and pollutant emission characteristics are analyzed to obtain the optimal working conditions. After one flue gas recirculation, the energy return on investment(EROI) of direct replacement mining NGH is 7.5, meaning it has an actual exploitation value. |
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