Chemical Looping Combustion of Methane or Coal by $$\hbox {Fe}_{2}\hbox {O}_{3}/\hbox {CaSO}_{4}$$ Fe 2 O 3 / CaSO 4 Mixed Oxygen Carrier

Autor: Prapan Kuchonthara, Panuwattana Kanokwannakorn, Sasithorn Sunphorka
Rok vydání: 2019
Předmět:
Zdroj: Arabian Journal for Science and Engineering. 44:5501-5512
ISSN: 2191-4281
2193-567X
DOI: 10.1007/s13369-019-03799-6
Popis: The effects of $$\hbox {Fe}_{2}\hbox {O}_{3}$$ addition to $$\hbox {CaSO}_{4}$$ as a composite oxygen carrier, which is a useful material in terms of its combustion and thermal stability, were evaluated in the chemical looping combustion (CLC) of $${\hbox {CH}}_{4}$$ and coal. The addition of $$\hbox {Fe}_{2}\hbox {O}_{3}$$ to $$\hbox {CaSO}_{4}$$ was found to enhance the $$\hbox {CO}_{2}$$ evolution rate and total amount of $$\hbox {CO}_{2}$$ produced, with the best results, in terms of $$\hbox {CO}_{2}$$ production and $${\hbox {CH}}_{4}$$ conversion, obtained with a 20% by weight (wt%) addition of $$\hbox {Fe}_{2}\hbox {O}_{3}$$ to $$\hbox {CaSO}_{4}$$ (20% $$\hbox {Fe}_{2}\hbox {O}_{3}/\hbox {CaSO}_{4})$$ . The preliminary study for thermal stability and regeneratability of 20% $$\hbox {Fe}_{2}\hbox {O}_{3}/\hbox {CaSO}_{4 }$$ in the CLC of $${\hbox {CH}}_{4}$$ and coal was established over four and three reduction–oxidation cycles, respectively, while the morphology and solid composition of the fresh and spent oxygen carrier were analyzed by scanning electron microscopy and X-ray diffractometry (XRD), respectively. The formation of $$\hbox {Ca}_{2} \hbox {Fe}_{2}\hbox {O}_{5}$$ in the reduced 20% $$\hbox {Fe}_{2}\hbox {O}_{3}/\hbox {CaSO}_{4}$$ , as detected by XRD measurements, appeared to prevent thermal agglomeration. For the CLC of coal, the reaction was optimal at $$950\,^{\circ }\hbox {C}$$ . The results confirm that the 20% $$\hbox {Fe}_{2}\hbox {O}_{3}/\hbox {CaSO}_{4}$$ composite oxygen carrier could potentially be used in the CLC process of both gaseous and solid fuels.
Databáze: OpenAIRE
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