| 摘要 |
PROBLEM TO BE SOLVED: To simply regenerate a deteriorated catalyst with a very small amt. of a halogen compd. in an apparatus wherein CO and hydrocarbons are removed by contact oxidation at low temp. SOLUTION: When an exhaust gas cleaning catalyst is deteriorated, the gas inlet direction of a catalyst layer 2 in a catalytic reactor 12 is shifted by using dampers 3-6. By opening the dampers 3 and 5 provided in an exhaust gas flow path 10a and closing the damper 4 provided in a flow path 10b and the damper 6 provided in a flow path 10c, the exhaust gas flows into from the front side in a figure of the catalytic reactor 12 and by closing the dampers 3 and 5 of the flow path 10b and opening the dampers 4 and 6 of the flow paths 10b and 10c, the exhaust gas flows into from the back side in a figure of the catalytic reactor 12. In addition, when activity of the catalyst is deteriorated, steam may be intermittently poured or the catalyst provided in the outlet part of the exhaust gas in the catalyst layer 2 piled into multistages and the catalyst of the inlet part may be respectively filled again so as to shift them to the gas inlet part and the outlet part or a combustible material such as methanol and propane may be poured into the catalyst layer for a definite period after the catalyst is deteriorated. |
