| 摘要 |
<p>PURPOSE:To attain to rationalize installation capacity, in the exhaust gas treatment apparatus of a coal burning boiler, by allowing the inlet of a recirculation duct to open in the bottom part side, where dust concn. is high, in the outlet duct of a high temp. electric dust collector. CONSTITUTION:In branching recirculation gas from the outlet duct of an electric dust collector, gas high in dust concn. is selectively branched from the outlet duct 13 having a height H of the electric dust collector to be introduced into a recirculation duct 16 provided to the lower part, which has a height (h)(h<H), of said duct 13 and guided to a gas recirculating fan by said recirculation duct 16. The dimension (h) is set so as to form a formula gas recirculation ratio h/H and the branching position of the recirculation duct may be set to the part directly after the outlet throttle duct 12 of the electric dust collector or the further downstream side from said duct 12.</p> |
