ACTIVITY REGENERATING METHOD OF CATALYST FOR ELIMINATING NITROGENOXIDES AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an activity regenerating method for regenerating the activity of a catalyst for eliminating nitrogen oxides by washing a spent catalyst for deNOx with a chemical relatively inexpensive and easily handleable and to provide a device therefor. SOLUTION: In the activity regenerating method of the deNOx catalyst regenerating the activity of the deNOx catalyst in which deNOx rate is deteriorated by sticking of Na and K contents thereto when used at a heavy oil burning boiler and increased in an SO3 conversion due to sticking of vanadium content contained in a fuel, the deNOx catalyst is washed with 0.1-30% circuit acid aq. soln. and 0.1-20% sulfuric acid aq. soln.