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Numerical studies of pulverized coal swirl combustion in oxy-fuel atmosphere are carried out.
Combustion in the oxy-fuel atmosphere is similar to combustion in air, which eases the design of oxy-fuel combustors.
The TGA/DTG studies showed, however, that devolatisation and fuel ignition in the oxy-fuel atmosphere occur at lower temperatures compared to the air atmosphere.
Carbonate minerals in oil shale decompose in air in one step and in the oxy-fuel atmosphere in two separate steps: the decomposition of dolomite (CaMg(CO3 2) and the subsequent decomposition of calcite (CaCO3).
It was found that the impact of the oxy-fuel atmosphere onto increased explosion risks is lower than it could be concluded from an increase in oxygen concentration in the system.
The results also indicate that the increase of O2 concentration in the oxy-fuel atmosphere from 21.8% O2 to 28.4% O2 has a positive impact on process performance while the further increase to 35% O2 leads to lower energy efficiencies.
An increased oxygen ratio in combustion in the oxy-fuel atmosphere increases the overall combustion rate, whereas the CO2 emission volumes decrease because of the lower decomposition extent of carbonates.
The replacement of the background N2 gas of air with CO2 (i.e., changing from air to an oxy-fuel atmosphere) at the same oxygen mole fraction impaired the intensity of combustion.
Results show that burning biomass separately produces higher NO emissions and a higher fuel nitrogen conversion ratio than burning coal without biomass addition due to the higher volatile matter content of the biomass; the fuel nitrogen conversion ratio is in agreement with the H/N ratio in the fuel under both air and oxy-fuel atmosphere.
was evaluated under the following oxy-fuel atmospheres: 21.8% O2, 28.4% O2 and 35% O2 concentration.
Four coals with different rank were measured in air and in oxy-fuel atmospheres containing 20 35 vol% O2 in CO2.
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