| abstract |
A denitration apparatus is useful for the treatment of an NOx-containing untreated gas from an offgas source. The apparatus includes a means for feeding the NOx-containing untreated gas, a means connected to the feeding means so as to charge ammonia into the untreated gas, a denitration reactor with a catalyst packed therein, and a means for discharging the thus-denitrated gas. The apparatus also includes a bypass means, which connects the gas-discharging means to the gas-feeding means at a location upstream of the duct of the ammonia-charging means so that a portion of the untreated gas is caused to bypass the denitration reactor and is then mixed in the resultant gas. The apparatus further includes a means for regulating the flow rate of the untreated gas to be caused to pass through the bypass means. |