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.
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.
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