| 摘要 |
<p>PURPOSE:To remove the low b.p. substance such as mercury contained in the exhaust gas from an incinerator, by the abrupt change in the temp. of gas and the contact (or collision) of the gas with water. CONSTITUTION:In a method for removing the low b.p. substance in the exhaust gas from an incinerator according to an absorbing tower system, a process generating the abrupt change in temp. over 130-250 deg.C and simultaneously contacting water with the gas is performed in two stages. For example, the exhaust gas from the incinerator is guided to a first absorbing tower 1 by a blower while the dust therein is removed by a dust collector. The inlet gas temp. of the first absorbing tower is 200-300 deg.C but cooled to 65-85 deg.C through the contact with a recirculation liquid. The gas after cooling is again heated to 180-250 deg.C by a gas heater 2 and, thereafter, introduced into a second absorbing tower 3 to be cooled so as to bring the outlet gas temp. of said tower to about 40-70 deg.C. The exhaust gas issued from the second absorbing tower is discharged to the atmosphere through a white smoke preventing apparatus 4.</p> |
