Study of an Iron-Based Oxygen Carrier on the Moving Bed Chemical Looping System
2018
Chen, Cetera | Lee, Hsiu-Hsia | Chen, Wilson | Chang, Yu-Cheng | Wang, Eric | Shen, Cheng-Hsien | Huang, Kuo-En
The Industrial Technology Research Institute has developed a 30 kWₜₕ moving bed chemical looping system for hydrogen production. Methane is supplied as a fuel to the reducer, and steam is supplied to the oxidizer to produce hydrogen. An iron-based oxygen carrier is used circulating between the reactors. In this study, the mechanical strength, attrition rate, and conversion rate of the oxygen carrier were tested at two Fe₂O₃ levels of content (40 and 60 wt %) calcined at temperatures of 1100 and 1300 °C. The oxygen carrier with the lower iron content presented the higher conversion rate of 72% at both calcination temperatures. The mechanical strength (170.5 N) and attrition rate (0.3%) of the oxygen carrier with a low Fe₂O₃ content were higher at the higher calcination temperature. Further, the oxygen carriers were circulated in the 30 kWₜₕ moving bed chemical looping system under ambient and high-temperature conditions. The oxygen carrier with two Fe₂O₃ content levels (40 and 60 wt %) at the calcination temperature of 1200 °C was employed in the attrition rate test conducted in the chemical looping system. Under the ambient temperature conditions, the average attrition rate of the oxygen carrier with a lower Fe₂O₃ content was lower (0.16%) than that of the oxygen carrier with a higher Fe₂O₃ content (0.24%). Moreover, the test results show the operating temperature has a lower level of influence on the attrition rate of the oxygen carrier.
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