Impacts of equations of state (EOS) and impurities on the volume calculation of CO_2 mixtures in the applications of CO_2 capture and storage (CCS) processes

摘要

Volume property is the necessary thermoclynamic property in the design and operation of the CO_2 capture and storage system (CCS). Because of their simple structures, cubic equations of state (EOS) are preferable to be applied in predicting volumes for engineering applications. This paper evaluates the reliabilities of seven cubic EOS, including PR, PT, RK, SRK, MPR, MSRK and ISRK for predicting volumes of binary CO_2 mixtures containing CH_4, H_2S, SO_2, Ar and N_2, based on the comparisons with the collected experimental data. Results show that for calculations on the volume properties of binary CO_2 mixtures, PR and PT are generally superior to others for all of the studied mixtures. In addition, it was found that the binary interaction parameter has clear effects on the calculating accuracy of an EOS in the volume calculations of CO_2 mixtures. In order to improve the accuracy, k_(ij) was calibrated for all of the EOS regarding the gas and liquid phases of all the studied binary CO_2 mixtures, respectively.