The influence of desulfurization liquid temperature (TL) on the improvement of grade and overall removal efficiency of fine particles by the WFGD system with steam addition in the particle growth region is shown in Fig. 7 and Table 3. The liquid-to-gas ratio
(L/G) was 10 L Nm3 and the amount of steam added was 0.08 kg Nm3. The temperature of inlet flue gas is in the range of 118–122 C. As the temperature of desulfurization liquid increases, the removal efficiency decreases. This can be explained by the influences on humidity and temperature of desulfurated flue gas at different desulfurization solution temperature, which is shown in Table 3. As the temperature of desulfurization solution enhance, the absolute humidity of desulfurated flue gas increases with a diminishingly trend caused by the improvement of evaporation of desulfurization solution. And the temperature of desulfurated flue gas increases simultaneously. Hence the relative humidity of desulfurated flue gas increases firstly and then decreases by the simultaneous varieties of absolute humidity and temperature.
Therefore, the supersaturated vapor environment necessary for the heterogeneous condensation is influenced by increasing desulfurization solution temperature in both ways. On the one hand, the increase of absolute humidity is propitious to establish the
supersaturated vapor environment. On the other hand, the supersaturated vapor environment is difficult to achieve for the simultaneous increase of scrubbed flue gas temperature, which go against the removal of fine particles. The both influences of desulfurization solution are at the same level, while desulfurization solution temperature being lower than 50 C, which is validated by the results of grade and total removal efficiencies in Fig. 7 and Table 3. However, the adverse influence dominates with desulfurization solution temperature higher than 50 C. And fine particles removal
efficiencies decrease with increasing the temperature of desulfurization solution.