Abstract
A novel method of improving the SO2 absorption performance of sodium citrate (Ci-Na) using sodium humate (HA–Na) as an additive was put forward. The influence of different Ci-Na concentration, inlet SO2 concentration and gas flow rate on desulfurization performance were studied. The synergistic mechanism of SO2 absorption by HA–Na and Ci-Na was also analyzed. The consequence shows that the efficiency of SO2 absorption by Ci-Na is above 90% and the desulfurization time added with the Ci-Na concentration rising from 0.01 to 0.1 mol/L. Both the desulfurization efficiency and time may increase with the adding of HA–Na quality in Ci-Na solution. Due to adding HA–Na, the desulfurization efficiency of Ci-Na increased from 90% to 99% and the desulfurization time increased from 40 to 55 min. Under the optimum conditions, the desulfurization time of Ci-Na can exceed 70 min because of adding HA–Na, which is nearly doubled. The growth of inlet SO2 concentration has little effect on the desulfurization efficiency. The SO2 adsorption efficiency decreases with the increase of inlet flow gas. The presence of O2 improves the SO2 removal efficiency and prolongs the desulfurization time. Therefore, HA–Na plays a key role during SO2 absorption and can dramatically enhance the SO2 adsorption performance of Ci-Na solution.
Highlights
It is well known that fossil fuels is mainly used to generate electrical energy in power plants and the combustion of fossil fuels generates SO2, which is the major source of acid rain and a major air pollutant, which severely influences the atmosphere environment and human health if not controlled [1,2]
This paper studies the absorption performance of Humic acid (HA)–Na/Ci-Na and the desulfurization mechanism, which will lay the foundation for further research and popularization in the future
It shows the relationship of Ci-Na concentration and SO2 desulfurization efficiency [30]
Summary
It is well known that fossil fuels is mainly used to generate electrical energy in power plants and the combustion of fossil fuels generates SO2, which is the major source of acid rain and a major air pollutant, which severely influences the atmosphere environment and human health if not controlled [1,2]. Sodium humate (HA–Na) is a water-soluble sodium salt of HA and a costeffective absorbent, which reacts with H+ to produce HA precipitate promoting the dissolution of SO2 in the water [21]. They have been studied more broadly for biological breeding and pollution control due to their characteristics of adsorption, chelation and ion exchange [22]. With the enhancement of the swelling property of HA, the active groups of HA can be more fully exposed in the aqueous solution and the probability of contact between HA and adsorbed ions is increased and it improves the adsorption effect [24,25,26]. This paper studies the absorption performance of HA–Na/Ci-Na and the desulfurization mechanism, which will lay the foundation for further research and popularization in the future
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