| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a wet stack gas desulfurizing device whose desulfurizing/dust- removing efficiency is improved while suppressing the increase in liquid-gas ratio of absorbing solution and waste gas and whose operation cost and equipment cost are reduced. SOLUTION: An absorbing solution reserving part 33 in which absorbing solution 17 containing limestone is reserved, and a solution reservoir 35 in which the solution 34 of absorbing agent higher in absorbing activity than that of the limestone are provided at the bottom part in an absorption tower 12 across a partition wall 36, and a primary desulfurizing spray nozzle 31' for executing primary desulfurization of the waste gas by spraying the absorbing solution 17 is disposed at the upper par in the absorption tower 12, and a secondary desulfurizing spray nozzle 37 for executing secondary desulfurization of the waste gas by spraying the solution 34 after primary desulfurization is disposed in an absorption tower 12 above the primary spray nozzle, and a solution recovering member 38 permitting only circulation of the waste gas subjected to primary desulfurization from downward to upward receiving the solution 34 sprayed from the secondary desulfurizing spray nozzle 37 conducting the solution 34 to the solution reservoir 35 is provided in the absorption tower 12.</p> |
