Study on Influence of Fog Film Distribution State on Performance of Wet Dust Collector
Aiming at the problem that the influence of fog film state on the dust removal performance of wet dust collector is unknown,three kinds of dust samples with different particle size and composition were prepared,and a dust removal performance test platform was built.The change of fog film distribution state and the influence of gas-liquid ratio,dust concentration and dust particle size on dust removal performance were studied.The results show that with the increase of water supply,the distribution range of the mist film in the inlet impeller of the dust collector will be expanded,but the atomization effect will be worse,which will lead to the decrease of the purification effect of the dust collector.When the water supply reaches 0.8 m3/h,the area of the mist film formed by the inlet impeller is the largest,and the total dust purification efficiency of the wet vortex dust collector for coal dust and talcum powder reaches 95.10%,89.75%and 88.43%,respectively.The wettability of the dust has a great influence on the dust removal efficiency.The average contact angles of the experimental pulverized coal and talcum powder are 42.849° and 55.636°.The average purification efficiency of pulverized coal and talcum powder in the similar particle size range is 94.39%and 88.54%,respectively.The pulverized coal is 5.85 percentages higher than the talcum powder.With the increase of dust concentration,the purification efficiency of total dust and respirable dust of the dust collector shows a trend of increasing first and then decreasing.The highest coal dust reaches 95.89%,and the highest talcum dust reaches 89.43%.Dust with different particle sizes also has a great influence on the dust removal efficiency.The D90 of 1 250 mesh and 3 000 mesh talcum powder used in the experiment is 20.620 μm and 7.870 μm respectively.When the dust concentration is 100 mg/m3,the dust removal efficiency is 86.495%and 76.389%respectively.The dust removal efficiency of 1 250 mesh talcum powder is 10.106 percentages higher than that of 3 000 mesh.When the dust concentration is higher than 300 mg/m3,because a large number of respirable dust agglomerates on the fog film and is captured by droplets of similar particle size,the dust removal efficiency of the two types of dust is close.
fog film distributionfine particlesparticle size distributiongas-liquid ratiopurification efficiency
NETL
NSTL
万方数据
