| In China, the atmospheric haze becomes more and more frequency in recent years, and has significant effect on human health and ecological environment atmosphere. Fine dust in atmosphere is the main cause of haze, and the main sources of fine dust mainly includes industrial emissions, vehicle exhaust, biomass fuel combustion, etc. Therefore, the capture of fine dust from industrial exhaust gas is one of most direct and effective methods to control haze. The existing industrial dust removal technology usually adopts dry or semi-dry method and wet dust removal technology by traditional tower. These technologies exhibits the disadvantages of low ultrafine dust removal efficiency, the secondary dust and so on, and can not achieves the effective removal of fine dust from gas emissions.Higee technology (RPB)/is the implementation equipment of Higee. Liquid in the RPB can be broken into tiny droplets, causes an intensification of flow disturbance, thus greatly strengthen gas-liquid contact area and the collision probability between particles and wet packing. In view of these, an RPB was adopted as the ultra fine dust removal equipment to investigate the absorption of the different chemical composition of super fine dust by water to achieve the cleaning of atmospheric particulate matter particles. The effects of different operating conditions on the removal efficiency of fine particulate matters was investigated. Also, the wet dust removal mechanism in the RPB was deduced, and a model was established to predict the removal efficiency of fine particulate matters. The research content is as follows:1. Investigation of the capture of the fine analog carbonaceous component dust in the RPB. The effects of rotation speed, gas-liquid ratio, initial concentration of fine dust and inlet gas temperature on the removal efficiency was investigated. The results showed that the removal efficiency increased with increasing rotation speed, initial dust concentration and gas temperature, and decreased with increasing gas-liquid ratio. The optimal operating conditions of a rotation speed of 1200 rpm, a gas-liquid volumetric ratio of 600-700 and a temperature of 50-70℃ was obtained by the experimental study, and the overall removal efficiency of fine dust can reached 98% under the optimal operating conditions.2. Investigation of the capture of the fine analog metal component dust in the RPB. The effects of rotation speed, gas-liquid ratio, initial concentration of fine dust and inlet gas temperature on the removal efficiency was studied. The results showed that the removal efficiency increased with increasing rotation speed, initial dust concentration and gas temperature, and decreased with increasing gas-liquid ratio. The optimal operating conditions of a rotation speed of 1200 rpm, a gas-liquid volumetric ratio of 600-700 and a temperature of 50-70℃ was obtained by the experimental study, and the overall removal efficiency of fine dust can reached 97% under the optimal operating conditions.3. Investigation of the capture of the fine analog organic component dust in the RPB. Experiments were carried out to investigate the effects of rotation speed, gas-liquid ratio, initial concentration of fine dust and the inlet gas temperature on the removal efficiency. The results showed that the removal efficiency increased with increasing rotation speed, initial dust concentration and gas temperature, and decreased with increasing gas-liquid ratio. The optimal operating conditions of a rotation speed of 1200 rpm, a gas-liquid volumetric ratio of 600-800, a temperature of 50-70℃ was obtained by the experimental study, and the overall removal efficiency of fine dust and the outlet gas concentration can reached 96% and 0.25 mg·m-3 respectively under the optimal operating conditions.4. Investigation of the capture of the fine analog inorganic salt component dust in the RPB. The effects of rotation speed, gas-liquid ratio, initial concentration of fine dust and the inlet gas temperature on the removal efficiency was investigated. The results showed that the removal efficiency increased with increasing rotation speed, initial dust concentration and gas temperature, and decreased with increasing gas-liquid ratio. The optimal operating conditions of a rotation speed of 1200 rpm, a gas-liquid volumetric ratio of 600-700 and a temperature of 50-70℃ was obtained by the experimental study, and the overall removal efficiency of fine dust and the outlet gas concentration can reached 98% and 0.15 mg·m-3 respectively under the optimal operating conditions.5. Investigation of the wet dust removal mechanism in the RPB. A model was established to predict the grade removal efficiency of ultra fine dust in the RPB. It was observed that the value obtained by the model was in good agreement with the experimental data, with deviations within 2% compared to the experimental values, and the model can offers relatively precise predictions of the removal efficiency of fine particulate matter in the RPB.It can be seen from the experimental study that the fine particulate matters can be easily removed from gas stream with a fine dust removal efficiency of above 95% by wet removal dust in the RPB. The process exhibits the potential application of RPB in the effective capture of ultra fine dust by water. |
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