The application of spray towers for CO_2 capture is a development trend in recent years. However, most of the previous jobs were conducted in a cylindrical tower by using a single spray nozzle, whose configuration and performance is not good enough for industrial application. To solve this problem, the present work proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the heat and mass transfer of CO_2 absorption process. Experiments were performed to investigate the mass transfer performance (in terms of the CO_ 2 removal rate (η) and the overall mass transfer coefficient (K_Ga_e)) of the improved spray tower under various operating conditions. Experimental results showed that the liquid to gas ratio and mole ratio of MEA to CO_2 are major factors, which affect the absorption performance and the maximums of η and (K_Ga_e that are 94.0% and 0.574 kmol·m~(-3)·h~(-1)·kP a~(-1), respectively, under the experimental conditions. Furthermore, new correlations to predict the mass transfer coefficient of the proposed spray tower are developed in various CO_2 concentrations with a Pearson Correlation Coefficient over 90%. The application of spray towers for CO_2 capture is a development trend in recent years. However, most of the previous jobs were conducted in a cylindrical tower by using a single spray nozzle, whose configuration and performance is not good enough for industrial applications. this problem, the present work proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the heat and mass transfer of CO 2 absorption process. Experiments were performed to investigate the mass transfer performance (in terms of the CO 2 removal rate (η) and the overall mass transfer coefficient (K_Ga_e)) of the improved spray tower under various operating conditions. Experimental results showed that the liquid to gas ratio and mole ratio of MEA to CO_2 are major factors, which affect the absorption performance and the maximums of η and (K_Ga_e that are 94.0% and 0.574 kmol · m -3 · h -1 · kP a -1, respectively, under the experimental conditions. Furthermore, new correlations to predict the mass transfer coefficient of the proposed spray tower are in various CO 2 concentrations with a Pearson Correlation Coefficient over 90%.