Abstract: Experiments of simulated flue gas desulfurization (FGD) were carried out by using ethylene waste alkali liquor as absorbent. The influence of affecting factors including inlet gas temperature, oxygen content in flue gas, ratio of liquid to gas volume, SO₂ concentration at the inlet of flue gas, and velocity of flue gas on the efficiency of flue gas desulfurization was studied. The economic benefit of this process technology used in a plant is analyzed. Experimental results show that desulfurization efficiency reached more than 95% of the process parameters: inlet flue gas temperature of 80~90 ℃, oxygen content of 5%~6% in flue gas, ratio of liquid to gas volume of 3.5 L/m³, flue gas velocity of 3.5~4.5 m/s. When ethylene waste alkali liquor concentration was 2.0% NaOH and 7.2% Na₂CO₃ or much more, the desulfurization efficiency is higher. In addition, ethylene waste alkali liquor had certain foaming tendency at low speeds of the flue gas.

Key words:  ethylene waste alkali liquor, defoamer, flue gas desulfurization (FGD), sodium alkaline method