Chemical-Looping Combustion of Methane Using $$\hbox {CaSO}_{4}$$ CaSO 4 as an Oxygen Carrier: Effects of MgO Addition

Autor: Prapan Kuchonthara, Oranee Poonsritanakul, Sasithorn Sunphorka
Rok vydání: 2018
Předmět:
Zdroj: Arabian Journal for Science and Engineering. 44:5359-5370
ISSN: 2191-4281
2193-567X
DOI: 10.1007/s13369-018-3620-5
Popis: This work focused on the performance of $$\hbox {CaSO}_{{4}}$$ as an oxygen carrier with the addition of varying levels of MgO. The reduction of the oxygen carrier by $$\hbox {CH}_{{4}}$$ was investigated in a laboratory-scale fixed-bed reactor. The effect of the reaction temperature was examined on the reduction of $$\hbox {CaSO}_{{4}}$$ . The results indicated that a higher temperature led to high combustion efficiency and induced CaO formation, which decreased the performance and recyclability of $$\hbox {CaSO}_{{4}}$$ . The addition of MgO to the $$\hbox {CaSO}_{4 }$$ accelerated the reduction reaction and impeded the formation of CaO. Moreover, the $$\hbox {MgO}/\hbox {CaSO}_{{4}}$$ composite oxygen carriers manifested a better recyclability with increasing MgO levels of up to 50 wt% by reducing the formation of CaO. However, the combustion efficiency of $$\hbox {CH}_{{4}}$$ was optimal at 30 wt% MgO. Therefore, the mass fraction of MgO must be controlled to confine the side reactions that are catalyzed by MgO itself, yet still help improve the overall performance of the $$\hbox {CaSO}_{{4}}$$ -based oxygen carrier.
Databáze: OpenAIRE
Externí odkaz: