Journal
FUEL
Volume 88, Issue 4, Pages 697-704Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2008.09.018
Keywords
Limestone; Modification; Acetic acid solution; Calcium looping cycles; CO2 mitigation
Categories
Funding
- National Basic Research Program of China [2006CB705806]
- Foundation of Graduate Creative Program of Jiangsu Province, China [JS06059]
- Foundation of Excellent Doctoral of Southeast University, China
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CaO-based sorbent looping cycle, i.e. cyclic calcination/carbonation, is one of the most interesting technologies for CO2 capture during coal combustion and gasification processes. In order to improve the durability of limestone during the multiple calcination/carbonation cycles, modified limestone with acetic acid solution was proposed as an CO2 sorbent. The cyclic carbonation conversions of modified limestone and original one were investigated in a twin fixed bed reactor system. The modified limestone shows the optimum carbonation conversion at the carbonation temperature of 650 degrees C and achieves a conversion of 0.5 after 20 cycles. The original limestone exhibits the maximum carbonation conversion of 0.15 after 20 cycles. Conversion of the modified limestone decreases slightly as the calcination temperature increases from 920 degrees C to 1100 degrees C with the number of cycles, while conversion of the original one displays a sharp decay at the same reaction conditions. The durability of the modified limestone is significantly better than the original one during the multiple cycles because mean grain size of CaO derived from the modified limestone is lower than that from the original one at the same reaction conditions. The calcined modified limestone shows higher surface area and pore volume than the calcined original one with the number of cycles. and pore size distribution of the modified limestone is superior to the original one after the same number of calcinations. (C) 2008 Elsevier Ltd. All rights reserved.
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