Experimental research on emission and removal of dioxins in flue gas from a co-combustion of MSW and coal incinerator

摘要

This paper describes the experimental study of dioxins removal from flue gas from a co-combustion municipal solid waste and coal incinerator by means of a fluidized absorption tower and a fabric filter. A test rig has been set up. The flow rate of flue gas of the test rig is 150-2000 m~3/h. The system was composed of a humidification and cooling system, an absorption tower, a demister, a slurry make-up tank, a desilter, a fabric filter and a measurement system. The total height of the absorption tower was 6.5 m, and the diameter of the reactor pool was 1.2 m. When the absorbent was 1 percent limestone slurry, the recirculation ratio was 3, the jet rate was 5-15m/s and the submerged depth of the bubbling pipe under the slurry was 0.14 m, the removal efficiency for dioxins was 99.35 percent The concentration of dioxins in the treated flue gas was 0.1573 X 10~(-13) kg/Nm~3 and the concentration of oxygen was 11 percent. This concentration is comparable to the emission standards of other developed countries.