关键词: 微气泡, 吸收, 直径分布, 有机废气, 多孔介质

Abstract: The microbubble absorption method is effective to remove organic compounds from waste gas. Generally, the microbubbles are generated by dispersing the waste stream into an absorber liquid. The microbubble absorption has the advantages of large contact area and high mass transfer rate. Water was used as the liquid media to absorb acetone from the waste gas of acetone-air mixture. Microbubbles were generated by a microporous plate with pore sizes of 3 to 4 microns and the bubble diameters were measured by the high-speed imaging method. The effects of operation parameters on the absorption efficiency were investigated experimentally. The results showed that the average diameter of the microbubbles decreased while the bubble numbers increased with the increasing of the superficial gas velocity and the concentration of acetone in water. By keeping the acetone concentration in water in the range of 1% to 3% and the superficial gas velocity of 10.2m/s, microbubbles with diameters of 300祄 to 700祄 were generated successfully through the microporous plate. The absorption efficiency changed with the variations of superficial gas velocity and the acetone mass concentration in the air-acetone waste gas. At the superficial gas velocity of 10.2m/s, the absorption efficiency increased with the increase of the acetone mass concentration in the waste gas and the maximal absorption efficiency was 77.16% at the acetone mass concentration in the waste gas of 1.56×10^-3kg/m³.

Key words: microbubble, absorption, size distribution, organic waste gas, porous media