Mass transfer-reaction process of flue gas desulfurization by carbide slug

The effect factors on carbide wet flue gas desulfurization were studied by orthogonal test and single-factor experiment,the mass transfer reaction model was established,too.The results show that the order of important factors is the ratio of liquid-gas(L/G) gas SO2 concentrationslurry pHcarbide concentrationAbsorption temperature.The ratio of liquid-gas,flue gas SO2 concentration,and slurry pH can improve the desulfurization rate significantly.The ratio of liquid-gas increases from 10 to 30,the desulfurization rate increases by 54.91% while dropped by 6.94% when L/G greater than 60.High flue gas SO2 concentration can improve the desulfurization efficiency increase,but when greater than 1 000×10-6,the desulfurization rate gradually declines.Increasing the slurry pH improved the desulfurization rates,the system desulfurization rate remaines above 90% at pH=9.The principle of carbide desulfurization is hydration and stabilization of SO2 by forming H+ and HSO-3.A stable compound CaSO3·2H2O is formed in this process to achieve flue gas desulfurization.The mass transfer-reaction process of flue gas desulfurization by carbide slug was established on film model,the reaction film of SO2 and HSO-3 was divided into 3 sections.