| 摘要 |
<p>PROBLEM TO BE SOLVED: To remove harmful substances at a high efficiency with the min. amt. of an exhaust gas treating agent by installing a measuring means concerning the back wash cycle of a bag filter and by controlling the amt. of an exhaust gas treating agent according to the measured back wash cycle of a bag filter. SOLUTION: An alkaline powder 4 for neutralizing HCl and SOx from an exhaust gas treating agent supply apparatus 3 and an adsorbent powder 5 (e.g. active carbon) for adsorbing org. chloride compds. and heavy metals are fed, in a flue 1a, to an exhaust gas 2 discharged from an incinerator 1. The exhaust gas 2 is caused to pass through a bag filter 8 and a pile thereof to be filtered and discharged as a cleaning gas 2" through a chimney 13. In back washing the pile of the bag filter 8, the pressure difference between the upper and the lower side of the bag filter 8 is measured with a pressure difference measuring device 9 and when the measured pressure difference reaches a certain value, a back washing air pulse jet 10 is started. The pressure difference measuring device 8 also measures the back wash cycle to control the amt. of the powder supplied.</p> |
