Interactions of Supercritical CO2 with Coal

详细信息    查看全文

• 作者：Dengfeng Zhang ; Lili Gu ; Songgeng Li ; Peichao Lian ; Jun Tao
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：January 17, 2013
• 年：2013
• 卷：27
• 期：1
• 页码：387-393
• 全文大小：387K
• 年卷期：v.27,no.1(January 17, 2013)
• ISSN：1520-5029

文摘

Carbon dioxide sequestration on coal with enhanced coalbed methane recovery (CO₂-ECBM) is acknowledged as a promising way to mitigate CO₂ emissions. For successfully understanding and implementing CO₂-ECBM process, the potential interactions of CO₂ with coal during CO₂ sequestration in coal seams were investigated. Research methods consisting of low-temperature nitrogen adsorption鈥揹esorption and chromatographic analysis were used to address the transformation of coal pore morphology and the capability of supercritical CO₂ extraction when coal contacts with high pressure CO₂. According to the test results, interaction of coal with high pressure CO₂ does not create a significant influence on pore shape and mesoporous volume distribution of any rank of coal. However, this causes the coal surface fractal dimension and specific surface area to be changed, which implies that the coal鈥檚 pore morphology change due to CO₂ sorption is irreversible. The results also indicate that the injection of high-pressure CO₂ does not only change the pore morphology of coal but also has the ability to extract the hydrocarbons present in the coal matrix. The extracted hydrocarbons are of biological toxicity and can be mobilized with gas or water to other geologic structures and aquifers. Thus, the potential environmental safety and health issues (ES&H issues) related to CO₂ sequestration in deep coal seams require thorough assessment.