How to remove gypsum scaling in the absorber on a Mitsubishi-Hitachi Power MHPS Wet FGD
Gypsum scaling in the absorber comes from slurry density running too high or oxidation air being insufficient. Reduce slurry density to the design band and verify oxidation air flow before attempting mechanical cleaning.
~120 min6 steps
How to restore low SO2 removal efficiency on a Mitsubishi-Hitachi Power MHPS Wet FGD
SO2 removal falling short of the permit target is usually a slurry pH problem from poor limestone quality or a blocked spray level. Check limestone reactivity and slurry pH first.
~60 min6 steps
How to clear mist eliminator plugging on a Mitsubishi-Hitachi Power MHPS Wet FGD
Rising differential pressure across the mist eliminator means gypsum scale is blocking the chevron blades. Verify that wash nozzles are firing on schedule and not plugged. Plan a high-pressure water wash during the next outage.
~90 min6 steps