Achievement of high CO2 concentration in the flue gas at slightly positive pressure during oxy-coal combustion in a 300 kWth furnace. (15th November 2015)

• Record Type: Journal Article
• Authors: Chi, Chung-Cheng; Lin, Ta-Hui; Huang, Wei-Cheng; Hou, Shuhn-Shyurng; Wang, Pai-Yi
• Is Part Of: Fuel. Volume 160(2015)
• Page Start: 434
• Page End: 439
• Publication Date: 2015-11-15
• Subjects: CCS -- Oxy-fuel combustion -- Recycled flue gas -- Climate change; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2015.08.001
• Languages: English
• ISSNs: 0016-2361

Abstract

Abstract: This study explores the combustion characteristics of a 300 kWth air-firing furnace adapted for oxy-firing combustion. The influences of operating pressure and oxygen/recycled flue gas (RFG) blend ratio on the combustion characteristics of oxy-coal firing were examined, especially on the exhausted CO2 concentration. High purity CO2 (94.1%) at the exit of the system was achieved for oxy-coal combustion at the optimized operation conditions (i.e., an RFG flow rate of 227 Nm 3 /h, feeding rates of oxygen and coal of 42.5 Nm 3 /h and 21 kg/h, respectively, and a slightly positive pressure of +100 Pa). The achievement of 94.1% CO2 emission has great potential for reducing CO2 emissions by carbon capture and storage and thus mitigating global climate change. Moreover, compared with air-firing operation, an NO emission reduction of around 66% was obtained in the oxy-firing operation.