Experimental Studies of SO₂ Absorption in the Sieve-Plate wet FGD Absorber

Limestone-gypsum wet FGD is the maximum widely applied FGD technology in the world at present, sieve-plate absorber is one of the critical tower in wet FGD processes. This article provides a study on the features of flow field distribution, resistance and desulfurization of sieve-plate FGD absorber through Laboratory-scale experimental FGD system. It is shown that the flow field distribution in sieve-plate FGD absorber is homogeneous, the deviation of velocity distribution of flue gas is 0.4–0.58, whereas the standard deviation of empty absorber is 0.99. In comparison with empty absorber, the pressure loss of sieve-plate absorber increased 30–160%, and following the decreasing of void ratio, the pressure loss of sieve-plate absorber has a tendency of increasing. While the void ratio of sieve-plate is decreasing from 44.3 to 31.5%, the pressure loss increased 16.1–27.6%. The desulfurization efficiency of sieve-plate absorber presents increase first and decrease afterwards following the increasing of void ratio of sieve-plate. In comparison with empty absorber, the desulfurization efficiency increased 8–22.89%. And under the condition of same sieve-plate, the desulfurization efficiency is 3–8% better when the distribution of sieve-plate pores is in square than that in triangle.