Investigation of reaction characteristics of CO2 sequestration by wet fly ash from coal-fired fluidized bed
LIU Xuanyi
WU Xin
JI Xiaoyang
LI Jun
LIU Yuhao
Abstract：In order to reduce fluidized bed fly ash accumulation and lower CO2 emission,CO2 sequestration by aqueous carbonation of fly ash discharged from coal-fire circulating fluidized bed boiler under various operational conditions was investigated in this study. The effects of reaction pressure,reaction temperature and liquid-solid ratio on the unit CO2 sequestration capacity which was calculated in the mass of CO2 sequestration by 1 g fly ash was evaluated. The results showed that the reaction pressure only affected the reaction rate but had no effects on the CO2 sequestration capacity. When the liquid-to-solid ratio was 1 mL/g,the reaction temperature was 70 ℃,the reaction pressure was 3 MPa and the stir speed was 300 r/min,the largest unit CO2 sequestration capacity were 0. 0879 g/g,the carbonation effi-ciency was up to 49. 58%. The results indicated that the fly ash from fluidized bed had a greater capacity for CO2 sequestration and the process had a certain practical value in the future.
Keywords：circulating fluidized bed boilerfly ashCO2 sequestrationcarbonation efficiency
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 64-68 )