| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the product cost of ammonium sulfate by discharging a part of separated liq., lowering its quantity and also improving a recovering efficiency of the ammonium sulfate moreover to improve a product value of the ammonium sulfate by preventing the inclusion of soot and dust and heavy metal to the ammonium sulfate to be recovered. SOLUTION: In this desulfurization equipment, a filter 39 for separating solid matter, a crystallization can 25 for precipitating the ammonium sulfate, a separator 27 for separating the separated ammonium sulfate and a return line 29 for returning the separated liq. separated at the separator to the crystallization can 25 are provided from upstream side at an ammonium sulfate recovering line 38 for discharging an ammonium sulfate soln. 24. Then, the flue gas is discharged to the outside of system so that the conc. of ammonium chloride in the separated liq. is not more than combined solubility by supplying a pH adjusting soln. to the upstream side of the filter.</p> |
