The absorption rate of CO_2/SO_2/NO_2 into a blended aqueous AMP/ammonia solution

摘要

Abstract-The Inter-governmental Panel on Climate Change (IPCC) reported that human activities result in the production of greenhouse gases (CO_2, CH_4, N,0 and CFCs), which significantly contribute to global wanning, one of the most serious environmental problems. Under these circumstances, most nations have shown a willingness to suffer economic burdens by signing the Kyoto Protocol, which took effect from February 2005. Therefore, an innovative technology for the simultaneously removal carbon dioxide (CO_2) and nitrogen dioxide (NO_2), which are discharged in great quantities from fossil fuel-fired power plants and incineration facilities, must be developed to reduce these economical burdens. In this study, a blend of AMP and NH_3 was used to achieve high absorption rates for CO_2, as suggested in several publications. The absorption rates of CO_2, SO_2 and NO_2 into aqueous AMP and blended AMP+NH, solutions were measured using a stirred-cell reactor at 293, 303 and 313 K. The reaction rate constants were determined from the measured absorption rates. The effect of adding NH_3 to enhance the absorption characteristics of AMP was also studied. The performance of the reactions was evaluated under various operating conditions. From the results, the reactions with SO_2 and NO_2 into aqueous AMP and AMP+NH, solutions were classified as instantaneous reactions. The absorption rates increased with increasing reaction temperature and NH_3 concentration. The reaction rates of 1, 3 and 5 wt% NH_3 blended with 30 wt% AMP solution with respect to CO_2/SO_2/NO_2 at 313 K were 6.05-8.49 x 10~(-6), 7.16-10.41 × 10~(-6) and 8.02~12.0x 10~(-6) kmol m~(-2) s~(-1), respectively. These values were approximately 32.3-38.7% higher than with aqueous AMP solution alone. The rate of the simultaneous absorption of CO_2/SO_2/NO_2 into aqueous AMP+NH, solution was 3.83-4.87x 10~(-6) kmol m~(-2) s~(-1) at 15 kPa, which was an increase of 15.0-16.9% compared to 30 wt% AMP solution alone. This may have been caused by the NH_3 solution acting as an alternative for CO_2/SO_2/NO_2 controls from flue gas due to its high absorption capacity and fast absorption rate.