CO2 REBINDING BY OIL SHALE CFBC ASHES: EFFECT OF PRE-TREATMENT
(0) Power production in Estonia is predominantly based on combustion of a local low-grade fossil fuel Estonian oil shale. Due to the high content of carbonaceous mineral matter in oil shale, its combustion is related to formation of lime-containing ashes (content of free CaO 10-30％) which could be utilized as sorbents for CO2. In the present research CO2 uptake by circulating fluidized bed and pulverized firing ashes from different technological devices (furnace, cyclones etc) of an operating power plant was studied and the effect of pre-treatment (grinding, calcination at different temperatures) of these ashes on their capture capacity was estimated using thermogravimetric, SEM, X-Ray and EDX analysis methods. It was found that capture capacities were determined mainly by free CaO content in the ashes, thereby, fluidized bed ashes showed higher CaO conversion levels (19.2-74.2％) as compared to pulverized firing ones (8.7-51.8％). Pre-treatment conditions influenced noticeably CO2 uptake. Grinding decreased CO2 capture capacity of fluidized bed ashes, calcination at higher temperatures decreased capture capacity of both types of ashes. Clarification of this phenomenon was given. Kinetic analysis of the process has been carried out, mechanism of the reactions and respective kinetic constants have been estimated.
CFBC ashes oil shale CO2 capture
Andres Trikkel Merli Keelmann Aljona Aranson Rein Kuusik
Laboratory of Inorganic Materials, Tallinn University of Technology,Ehitajate 5, 19086 Tallinn, Esto Laboratory of Inorganic Materials, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Est
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
1123-1129
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）