| OCR Text |
Show (d) Regeneration after deterioration • In the case of deterioration due to acidity of ammonium sulfate (@ above) / ~ By passing a high temperature gas through the catalyst, an ammonium hydrogensulfate is blown off. As the lower the flue gas temperature, the faster the deterioration, the shorter the interval of regeneration. • In the case of deterioration due to alkalinity (® above) ~ Cleaning with water and dry. As the deteriorationis slow, the interval of regeneration becomes longer. (e) Clogging of dust Honeycomb catalyst ~ Increase in pressure loss is extremely small due to clogp,inR of dusL. Pel Jet cata lyst 4) Records of delivery ~ It is necessary to remove dust periodically as a resu Ito r j n Cn~(1S0 i n pn~ss un~ loss due t.o clogging of dust . The records of delivery are as shown below: Table 1-2 Records of delivery of catalytic denitrification system Name of plant Treatment capacity Denitrification Completed Plant A 300ton/24h Ratio Mar. 1988 higher than 35% (schedu led) Plant B 300ton/24h Concentration Mar. 1991 lower than 50ppm (schedu led) 14 |
