| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wet flue gas desulfurization device in which deposition of gypsum at the bottom part of a circulation tank is prevented, clogging of a spray nozzle, damage of a circulation pump, lowering of desulfurization performance and a generation of scaling are prevented, reliability is high and a stable operation is realized. SOLUTION: A slurry distribution part is provided between the lower end part of a partition plate 4 and the bottom part of a circulation tank 7, i.e., at a lower side position as compared with the position of a half of a liquid depth of absorption liquid slurry 6 in the circulation tank 7. Thereby, since gypsum particles flow at the slurry distribution part with a flow of the slurry 6, it can be prevented that the gypsum is deposited on the bottom part of the circulation tank 7. Generation of scaling can be prevented by setting a size of the absorption liquid slurry distribution part such that an average flow speed of the absorption liquid slurry 6 at the slurry distribution part in the circulation tank 7 becomes 0.5-4 m/sec. Descending speed of the absorption liquid slurry 6 containing calcium sulfite at a high concentration is reduced by making a volume in the circulation tank 7 at an ascending flow area 13 side large to obtain a sufficient dwell time. Further, high concentration calcium sulfite can be completely oxidized in the circulation tank 7.</p> |
