REMOVAL METHOD OF SODIUM SALT AND POTASSIUM SALT FROM ASH COLLECTED BY SODA RECOVERY BOILER AND REMOVAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a removal device of sodium salts and potassium salts from the ashes collected by a soda recovery boiler preventing the crystal growth to the surface of a cooling part with cooling without particularly requiring cooling with ice. SOLUTION: In the removal device 11 of sodium salts and potassium salts from ashes collected by a soda recovery boiler, the captured ash from a combustion gas of the soda recovery boiler and water are mixed and slurry in which the sodium salts and the potassium salts in the collected ashes are dissolved in water is cooled to precipitate the solid content. The removal device 11 has a pre-cooling processing part 24 for pre-cooling the slurry to a temperature exceeding 15 deg.C and a post-cooling processing part 25 for further post-cooling the slurry pre-cooled to 15 deg.C or less.