Fig. 4a and b shows the improvement of grade and total number removal efficiency of fine particles by the WFGD system at different initial particles number concentration with addition of 0.08 kg Nm3 steam into the scrubbed flue gas in the particle growth region, which is above the spray scrubber. The liquid-togas ratio (L/G) was 10 L Nm3. The temperature of inlet flue gas and desulfurization liquid are in the range of 100–118 C and 15–20 C, respectively. The improvement of removal efficiency was obtained by comparing to the removal efficiency without steam addition. In these experiments, CaCO3 was used as SO2 absorbent. It is apparent that particle removal efficiency increased
with increasing the amount of air added. For example, with an increasing in the amount of air added from 40 to 100 m3 h1, the improvement of removal efficiency increased from 50% to 62%. This is caused by the fact that the fine particles in the flue gas can be
diluted by adding air with the same temperature. And the initial particle number concentration decreases with increasing the amount of air added. With an increase of the initial particle number, the amount of condensable water vapor is distributed to more particles and the droplets grow to a smaller size. Since the inertia of the droplets decreases with decreasing size, the removal efficiency of the droplets by the WFGD system is diminishing.
Fig. 4a and b shows the improvement of grade and total number removal efficiency of fine particles by the WFGD system at different initial particles number concentration with addition of 0.08 kg Nm3 steam into the scrubbed flue gas in the particle growth region, which is above the spray scrubber. The liquid-togas ratio (L/G) was 10 L Nm3. The temperature of inlet flue gas and desulfurization liquid are in the range of 100–118 C and 15–20 C, respectively. The improvement of removal efficiency was obtained by comparing to the removal efficiency without steam addition. In these experiments, CaCO3 was used as SO2 absorbent. It is apparent that particle removal efficiency increased
with increasing the amount of air added. For example, with an increasing in the amount of air added from 40 to 100 m3 h1, the improvement of removal efficiency increased from 50% to 62%. This is caused by the fact that the fine particles in the flue gas can be
diluted by adding air with the same temperature. And the initial particle number concentration decreases with increasing the amount of air added. With an increase of the initial particle number, the amount of condensable water vapor is distributed to more particles and the droplets grow to a smaller size. Since the inertia of the droplets decreases with decreasing size, the removal efficiency of the droplets by the WFGD system is diminishing.
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