ANALYSIS OF FORMATION THE GREENHOUSE EFFLUENTS TO ATMOSPHERE AND NITROGEN OXIDES PRODUCTION BY COMBUSTION THE METHANE-HYDROGEN MIXTURES
Within the framework of decarbonization of environment, the processes of the greenhouse gases formation in atmosphere by combustion the gas fuels (generally) and the natural gas substitution (particularly) the conditions of reducing the CO2 emission by methane-hydrogen mixtures burning are considered. The data on nitrogen oxides’ effluents are generalized in the work as well.
An important role of non-isothermal state and of radiation selectivity of three-atomic gases CO2 and H2O for the resulting heat exchange and by evaluation the corresponding heat fluxes has been stated. The data are discussed basing upon the calculations’ results of the radiative heat transfer within the layer of combustion products (CP) of natural gas for the case of non-isothermal emitting layer at partial pressures pH2O : pCO2 = 2 : 1.
The conclusion has been accepted on limitations regarding the opportunities to reduce the CO2 emission for the case of premixed methane-hydrogen mixtures burning while fuel combustion with an air-oxidant is proceeded. The evaluation under consideration has been proven taking into account only the cases of minor shares of [H2] ≤ 20–30 % (vol.) in fuel used by proper conditions for the domestic gas devices. The expected reduction of [CO2] mass emission fraction under combustion is reduced only by 10 % compared with the natural gas (methane) burning.
It has been found for the first time that in case of the fuels, not containing the nitrogen, the equilibrium concentrations of two main nitrogen oxides NO and NO2 have practically the same (invariable) NOx values (by each of oxides), independently on fuel composition: methane and higher hydrocarbons, methane-hydrogen gas mixtures at any fixed given temperature (T = idem) and definite air-oxidant’s excess factor (λ = idem).
This supposition has been numerically grounded and analyzed for the conditions of combustion the mentioned gas fuels under both the cases: of dry or wet air-oxidant. Bibl. 26, Fig. 4, Tab. 3.
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