Thermodynamic prediction of the effect of repeated recirculation of cooled flue gases on the content of major, minor, and trace compounds in oxy-coal combustion products

• Autorzy: Jerzak Wojciech
• Języki publikacji: EN

Abstrakty

EN

This study investigates changes in the composition of oxy-coal combustion products resulting from the recirculation of cooled flue gas (FGR) at 20, 60, 100, 200, and 300°C (containing 70-95 mol% CO2). It presents the results of thermodynamic calculations describing changes in the content of the major, minor, and trace components of flue gases, ash and condensate. The results reflect a scenario of starting the oxy-coal combustion system in a fluidized bed boiler using low-purity oxygen from an air separation unit. This work demonstrates that in FGR loop the major species, i.e., Ar and N2, as well as the minor, e.g., Cl2, PbCl4, HgCl2, and CrOCl3, are accumulated. After nine FGR loops cooled to 300°C, marked increases in concentrations were observed: ZnCl2 and HCl (3-fold), as well as CrO2(OH)2 (2.5-fold). The ash that was formed contained, among others, CaSO4, SiO2, CaMgSi2O6, MgSiO3, ZnFe2O4, and MgCr2O4, whose mass changed in successive reactors asa result of the repeated FGR. Depending on the temperaturę of the cooling reactor, flue gases were subjected to recirculation and the main component of the condensate was H2O or H2SO4·6H2O. The condensate contained chloride salts, e.g.,PbCl2, KCl, and ZnCl2, as well as sulfate salts, i.e., K2SO4 and Na2SO4, in smaller amounts. A consequence of the nine-fold FGR cooled toT≤200°C was, among others, a percentage mass increase in ZnCl2in the condensate. The less cooling applied to flue gases, the more likely the occurrence of sulfates was in the condensate.

Słowa kluczowe

EN

oxy-coal combustion; thermodynamic calculations; flue gas recirculation; fluidized bed boiler

PL

spalanie tlenowe węgla; obliczenia termodynamiczne; recyrkulacja spalin; kocioł fluidalny

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2020
• Tom: Vol. 100, nr 2
• Strony: 102--114
• Opis fizyczny: Bibliogr. 30 poz., rys., tab., wykr.

Twórcy

autor

Jerzak Wojciech

• AGH University

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).