To attain a high-level stabilization of an exhaust-gas treatment capacity and an exhaust-gas treatment operation by controlling a difference in storage level, generating between exhaust-gas treatment tanks, of an exhaust-gas treatment agent, and also keeping its difference in the range of controlling level.
A plurality of exhaust-gas treatment tanks 6 wherein the exhaust-gas treatment agent, received in the tanks, is discharged from lower parts of the tanks after being contacted with an exhaust gas while the treatment agent is moved from upper parts to the lower parts of tanks, a regenerating tower 8 for regenerating the exhaust-gas treatment agent, and a conveyer 10 for transporting the exhaust-gas treatment agent, cut off from the regenerating tower 8, to each exhaust-gas treatment tank 6, are installed. The exhaust-gas treatment agent, which is transported by the conveyer 10 to each exhaust-gas treatment tank 6 in order and also to all the exhaust-gas treatment tanks 6 in a cycle time determined in advance, is supplied. A cutting-off amount of the exhaust-gas treatment agent from the regenerating tower 8 is arranged so that a level of the exhaust-gas treatment agent of the exhaust-gas treatment tank 6 is a controlling value determined in advance, a transporting rate of the conveyer 10 is arranged correspondingly to the cutting-off amount of the exhaust-gas treatment agent, and a transporting amount per hour is controlled to be equivalent or near to the admittable maximum limit of a transporting capacity of the conveyer 10.
COPYRIGHT: (C)2006,JPO&NCIPI
Fukuoka Gan
Kenji Ishida
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Tadashi Harasaki