PURPOSE: To reduce power loss, to enhance dust removing effect and to reduce an arrangement space without generating orifice clogging, by arranging orifice plates each of which is provided with cross orifices each having a specific orifice area so as to obtain a specific opening area in a multi-stage fashion.
CONSTITUTION: A gas sending port 2 and a scrubbing liquid outflow port are provided to the lower end of a tower body while a gas outflow port 10 and a scrubbing liquid sending port 7 are provided to the upper part thereof. Orifice plates each of which is provided with cross orifices each having an orifice area of 150W700mm2 so as to set the opening ratio thereof 20W40% are arranged in two stages or more at stage intervals of 150W300mm between the upper and lower parts of the tower body. Exhaust gas is sent into the tower body from the lower part thereof at an available gas speed of 2W3m/sec by a blower 1 while a scrubbing liquid is supplied into the tower body from the upper part thereof at a ratio of 0.5W1.5l to 1m3 of exhaust gas. The scrubbing liquid is held on the surface of each orifice plate 3 but, when flowed down along each cross orifice, good gas-liquid contact with the exhaust gas is brought about to a super-vortex stream state of about 10m/sec during the passage of each cross orifice.
SUGIYAMA HIDEO
SASAI HIROSHI
YOSHIOKA KATSUMI
