I have some question about R2R(RFCC) VOV (Variable orifice valve) in #2 Regenerator Flue Gas Duct .
Recently we experienced the hot spot of VOV Body.
Its temperature by thermo vision is 590 ‘C.
So we concerned about damage of VOV body Refractory.
Could you suggest the possible cause or countermeasure for this problem? (steam jacketing?)
In 2010 TA we plugged 5 orifice hole of total 10 orifice hole. And the half of VOD Disc is eroded. And current VOV opening is 65% and Delta P is 1.2 kg/cm2 G.