Journal
CHEMICAL ENGINEERING JOURNAL
Volume 454, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.140432
Keywords
Basic oxygen furnace gas utilization; Carbon monoxide; Vacuum pressure swing adsorption; One-dimensional dynamic simulation; CuCl; boehmite adsorbent
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The suitable operation configurations for separating CO from BOFG were determined based on the desired product purity. The results showed that the 3-bed and 4-bed VPSA processes were cost-effective for enriching CO from BOFG, depending on the target purity of the CO product.
CO is a primary component of basic oxygen furnace gas (BOFG) and can be used for producing fuel and various value-added chemicals. It can be typically obtained from steel mill gases via separation. Herein, suitable bed operation configurations for vacuum pressure swing adsorption (VPSA) were determined based on the desired CO product purity (PURCO,P) when separating CO from simulated BOFG (CO:CO2:N2:CH4 = 65:20:10:5 mol%) using a numerical model validated with experimental data. By changing the operation steps, one case of two-bed, four-step (2-bed), one case of three-bed, five-step (3-bed), and two cases of four-bed, six-step (4-bedbase and 4-bedmod) operation configurations were considered at a setting temperature of 60 celcius, desorption pressure of 0.13 kgf cm-2, and adsorption pressure in the range of 2.5-4.0 kgf cm-2. The sensitivities of these four operation configurations were evaluated to compare the separation performance and economic benefits of each operation configuration. In the 2-bed case, the PURCO,P demonstrates a separation limit (92.1-92.7 mol%). When targeting PURCO,P >= 99.00 mol%, the 3-bed case presents the most favorable CO recovery values (RECCO,P; 92.97-94.13 %) and unit production costs of CO (UPCCO; 0.252-0.357 US$ Nm- 3), whereas the 4-bedmod case presents optimal RECCO,P (82.06-91.65 %) and UPCCO values (0.273-0.406 US$ Nm- 3) when targeting PURCO,P >= 99.99 mol%, under the same operating conditions. These results indicate cost-effective CO-VPSA process configurations for enriching CO from BOFG, based on the target PURCO,P.
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