Study On Liquid Phase Catalytic Oxidation Low-concentration SO₂ Industrial Waste Gas And The Desulfuration Liquid Stable Adjustion

In recent decades,with the rapid development of industry,the emission of sulfur dioxide makes the atmosphere seriously polluted,which has a bad impact on the living environment of animals and plants.So far,high concentration of sulfur dioxide exhaust gas purification has been effectively solved,but the removal of low-concentration sulfur dioxide is a defect of current desulfurization engineering.Liquid-phase catalytic oxidation flue gas desulfurization technology is a kind of green,economic and flue gas desulfurization technology in line with China's current national conditions.It has certain advantages in flue gas purification with low concentration of SO₂,and has a good development prospect.In this paper,the transition metal ion solution was atomized and sprayed to achieve the goal of flue gas desulfurization.Study found that the manganese ion liquid can improve desulfurization efficiency for flue gas desulfurization reaction.The desulfurization efficiency is relatively effective when concentration of manganese ion is 0.02 mol/L,the desulfurization efficiency was 48%.The existing experimental experience shows that there is a synergistic effect between manganese ion and iron ion in liquid desulfurization,which makes the desulfurization efficiency higher than that of single metal ion.Therefore,manganese and iron ions were used as desulfurization solution to study flue gas desulfurization.In this paper,the effects of ion ratio,desulfurization solution temperature,SO₂concentration,liquid-gas ratio,desulfurization solution pH,nozzle model,ammonia factors on the desulfurization efficiency were studied.Experimental results show that:manganese ion in the desulfurization liquid and the ratio of 2:1,desulfurization of liquid iron ion temperature is20°C,the concentration of SO₂ in flue gas to 1000 ppm,reaction liquid gas ratio is 1,the desulfurization liquid pH=3,atomizing nozzle model for 1 nozzle?that is,the nozzle outlet diameter is 0.15 mm?in flue gas desulfurization efficiency is considerable and the running cost to a minimum.under the condition of the experiment of desulfurization rate 95%will hold more than 400 min.When using ammonia water to regulate the desulfurization solution,not only the desulfurization efficiency cannot be increased,but also the desulfurization efficiency will be decreased.The addition of calcium hydroxide will decrease the concentration of metal ions in the desulfurization solution.The absorption rate of the reaction and the valence state of sulfur in the solution were studied by adjusting the temperature and the concentration of SO₂ in the flue gas.It was found that the initial absorption rate increased with the change of SO₂ concentration,but the absorption rate became unstable with the increase of SO₂ concentration.SO₃^2-and SO₄²⁺concentration increased in desulfurization liquid with the sulfur dioxide concentration increases.The increase of temperature decreases the absorption rate of SO₂,SO₃^2-and SO₄²⁺concentration increasedafter an initial decrease in the liquid phase.The reaction rate constant at different temperatures proves that the reaction of sulfur dioxide is a first-order reaction,and the activation energy is calculated to be 25.4 kJ/mol,which proves that the desulfurization method is efficient.