A MATHEMATIC MODEL OF ANOTHITE DISSOLUTION IN CO_2 SOLUTION

摘要

With basis on the fundamental theories of geochemistry and mass transfer, a mathematical model of Anothite dissolution in CO_2 solution is developed for describing the dynamics of interface chemistries and transport physics. The model developed is convenient to be implemented into the existed geo-hydrological numerical model for simulating the long-term CO_2 geological sequestration performance. The preliminary results obtained from model analysis shown that Anorthite dissolution in a CO_2 solution is mostly dominated by chemical reaction rather then the mass transfer when local Sherwood number is larger than 5 and temperature is lower than 325 K. For the environment of the CO_2 geological sequestration at depth about 1000 m, temperatures range from 313 to 338 K, the dissolution will be governed alternatively by chemical reaction or by fluid mass transfer depending on the variation in local Sherwood number.