Combustion characteristics and migration behavior of nuclides during incineration of low-level radioactive waste
- Release Time:2025-04-30
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Date:
2025-04-30Title of Paper:
Combustion characteristics and migration behavior of nuclides during incineration of low-level radioactive wasteJournal:
Thermal ScienceSummary:
Incineration is a main method of disposal low-level radioactive waste (LLRW).
However, the combustion characteristics and migration of nuclides during
incineration is still unclear. This study first investigated the effect of
package mass, feeding time interval, air distribution, and water vapor
supply on the combustion characteristics of LLRW and NOx emission. Optimal
parameters were obtained based on combustion efficiency and NOx
concentration. Then, the migration of nuclides was studied in conditions
with the optimal parameters. The results showed that the combustion
efficiency and NOx concentration were affected by furnace temperature, redox
atmosphere and their distribution inside the furnace. Package mass, feeding
time interval, and air distribution were optimized to balance the thermal
decomposition rate of the waste and the oxidation rate of the combustible
gas generated from thermal decomposition of the waste. Water vapor supply
can decrease the furnace temperature and the thermal decomposition rate of
the waste. The optimal parameters of package mass, feeding time interval,
air distribution, and the feeding rate of water vapor is 100 g/bag, 40s,
0.5/0.23/0.23/0.23(excess air coefficient) for the first layer to fourth
layer of air inlet, and 25 kg/h, respectively. During incineration, more
than 99% nuclides were fixed in bottom ash. The order of the ratio of
nuclides in flue gas, fly ash, and bottom ash is bottom ash>flue gas>fly
ash. Based on the ratio of nuclides in fly ash and flue gas, the order of
volatility of nuclides during incineration is Cr>Cs>Mn>Co>Nb>Zr.Co-author:
Renhui Ruan, Wenjing Ma, Guan Wang, Jianyu Li, Zhou Ao, Jie Lu, Minghui Yang, Chen Yi, H. Tan, Xuepeng WangTranslation or Not:
NoDate of Publication:
2023-01-03
