| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of treating an exhaust gas which can stably remove an acidic gas to exhaust control limits or below at a low treatment cost, when treating the exhaust gas with a significant variation of acidic gas concentration, which is targeted as such among the exhaust gases involved and also, can prevent soot/cinder from sticking fast to a bag filter etc. in the case that slaked lime is supplied to the exhaust gas etc., whereby the concentration of the acidic gas is reduced by supplying slaked lime to the exhaust gas. <P>SOLUTION: A first acidic gas removal process is to make a feedback control of the supply of a liquid alkali agent so as to get the concentration of sulfur dioxide contained in the exhaust gas close to a specified target concentration level, based on the concentration of sulfur dioxide measured in a concentration measuring process. Further, a second acidic gas removal process is to make a feed forward control of the supply of pulverized alkali agent so as to get the concentrations of hydrogen chloride and sulfur dioxide contained in the exhaust gas close to respective specified target concentration levels, based on the measurement values of the concentrations of hydrogen chloride and sulfur dioxide measured in the concentration measuring process. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
