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POST-COMBUSTION REMOVAL OF CARBON DIOXIDE FROM FLUE GASES

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Ionel, I; Padureanu I; Cebrucean D; Popescu Francisc; Cebrucean, V ; Trif-Tordai, G

Editorial: Editura Stiintifica FRM, Metalurgia International, 14 (1), p.40 - 46, 2009.

Rezumat:

The primary aim of this study has been to analyze and describe the process of capturing carbon dioxide from the flue gas by means of chemical absorption. A 35 wt% aqueous
monoethanolamine solution has been selected for removing CO2 from the flue gas stream. Separation of CO2 has been carried out in a packed bed absorber. Inlet flue gas CO2 concentration before
absorption ranges from 15 to 20%. Secondly, the co-firing process of biomass with coal in a bubbling fluidized bed combustor has been briefly investigated. There were co-fired woody sawdust
having a lower heating value of similar to 14 MJ/kg with a sort of lignite from the Motru coalfield (Romania) characterized by a LHV of 9 MJ/kg. A share of 10% of sawdust in the fuel mix has been
used. The co-firing tests have been performed on a 40 kW(th) BFBC test facility. Additionally, the SO2 has been removed in a wet packed bed scrubber by means of two different scrubbing aqueous
solutions, namely sodium hydroxide (2.5 w1% NaOH) and calcium hydroxide (2.5 wt% Ca(OH)(2)) respectively. In order to reduce the NOx level, ammonia has been injected into the flue gas
upstream of the cyclone at temperatures of 300-350 degrees C. Experimental results have shown that the emissions of CO2, SO2 and NOx have been reduced. Co-firing of sawdust with lignite in
fluidized bed has occurred without any operational problems

Cuvinte cheie: CO2 capture; monoethanolamine; biomass CO-firing; fluidized bed combustion; emissions