Comparative tests in air and oxy-fuel combustion with oxygen injection rates ranging from 21% to 40% were conducted in a 30kWth circulating fluidized bed (CFB) pilot plant for waste sludge combustion. General combustion characteristics of the CFB such as pressure profiles, temperatures along the bed, and flue-gas composition, were different under the air and oxy-fuel conditions with various oxygen injection rates. Based on the results, the optimal oxygen injection rate was determined as 25% for the oxy-fuel combustion. In the bottom and fly ash, alkali and heavy metals had different distribution under the air and oxy-fuel combustion conditions. The particle size distribution in fly ash from air combustion was dominated by coarse particles over 2.5 |im in size, whereas with oxy-fuel combustion, most particles were submicron in size approximately 0.1 μm, and a smaller amount of coarse particles over 2.5 pμm in size formed than with air combustion. Mass fractions of Al, Ca, and K below 2.5 p.m in size found in the ashes from oxy-fuel combustion were higher than those in air combustion were. Submicron particle formation from the Cr, Ni, Cu, and Zn in the fly ash occurred more during oxy-fuel combustion than it did in air combustion.
|Number of pages||7|
|Publication status||Published - 2017|
|Event||12th International Conference on Fluidized Bed Technology, CFB 2017 - Krakow, Poland|
Duration: 2017 May 23 → 2017 May 26
|Other||12th International Conference on Fluidized Bed Technology, CFB 2017|
|Period||17/5/23 → 17/5/26|
Bibliographical noteFunding Information:
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20113010130050). This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20164030201250).
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Filtration and Separation
- Fluid Flow and Transfer Processes
- Energy Engineering and Power Technology