Removal of sulfur dioxide in the sulfuric acid tail gas in impinging stream gas-liquid reactor
The sodium-calcium double alkali method was used to remove sulfur dioxide in sulfuric acid tail gas in impinging stream gas-liquid reactor.The effects of the SO2 mass concentration of simulated sulfuric acid tail gas,the NaOH mass fraction of absorbent,liquid-gas ratio and atomization pressure on desulfurization rate were investigated.The results show that with the lower SO2 mass concentration,the higher NaOH mass fraction,the higher liquid-gas ratio and atomization pressure,the desulfurization rate is higher.When the SO2 mass concentration of simulated sulfuric acid tail gas is between 800 and 2400 mg/m3,the optimized conditions for impinging stream gas-liquid reactor removing sulfur are as follows:the absorption liquid NaOH mass fraction is 2.0％,the liquid and gas ratio is 0.34-0.36 L/m3,the atomization pressure is 1-1.2 MPa.Under above conditions,the desulfurization rate is above 97％,the SO2 mass concentration of the tail gas is below 100 mg/m3,which is far lower than the emission standard stipulated by GB26132-2010.
double alkali methodsulfur dioxideimpinging stream gas-liquid reactorsulfuric acid tail gas
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